The Anthracite Chapter

NEWS May 2014

ASHRAE - Shaping Tomorrow’s Built Environment Today

2013-2014 OFFICERS & CHAIRS

President: Matt Archey marchey@borton-lawson.com (570) 821-1994 x257 President-Elect: Rich Karns rkarns@sordoni.com (570) 287-3161 x210 Vice-President: Patrick Salmon, LEED AP psalmon@ha-pa.com (570) 586-4334 x3126 Treasurer: Alyssa Procida alyssa.procida@irco.com (570) 654-0865 x234 Secretary & Membership Promotion Chair: Jon Keller jon@jfohora.com (570) 342-7778 Board of Governors: Tracey Jumper: (570) 606-6405 Dan Mello: (570) 288-8759 Tom Swartwood, PE: (570) 714-4984 Chapter Technology Transfer Chair: John Durdan, PE johndurdan@epix.net (570) 586-4334 x3152 Student Activities Chair: Tracey Jumper tjumper@smartwattinc.com (570) 471-3480 Research Promotion Chair: Ron Sibulsky ronsibulsky@mail.com (610) 392-2911 Young Engineers in ASHRAE Chair: Will Seiberling william.seiberling@irco.com (570) 654-0865 Historian & Newsletter Editor: Walt Janus, PE wjanus@gpinet.com (570) 507-9015 Website Homepage Editor: Karl Grasso kgrasso@anemostat.com (570) 562-2778 Government Activities Chair: Vacant

President’s Message The May Chapter meeting marks the end of our technical seminars and the approach of our summer recess. I’d like to take a moment to thank you, the Chapter Officers, Board of Governors, and the Committee members for your continued support of ASHRAE. We all play a role in growing and supporting our industry, so your commitment is truly appreciated. Despite this being our last meeting, there are still opportunities to get involved over the next several weeks:

• Our car show will be held next Sunday, May 18th, and I know Ron Sibulsky would welcome any volunteers itching to get involved.

• The annual Mark. A. Hagan golf tournament will be held on June 17th, and Jon Keller could use a hand in planning and tournament day set-up.

• Finally, if you would like to become involved with ASHRAE, we are looking for a Government Activities Committee Chair and a Chapter Technology Transfer Chair for the 2014-2015 year. Please contact me for more information on these opportunities to help serve your peers.

In closing, I’d like to recap on the goals that I had mentioned in my first message of the year and our successes over the past 9 months:

• We have made great strides in forming relationships between experienced and new ASHRAE members, helping to pass technical knowledge from one generation to the next.

continued on page 3

Chapter Website: http://anthracite.ashraechapters.org

ASHRAE ANTHRACITE CHAPTER MEETING

Tuesday May 20, 2014

Fan Filter Units for Clean Rooms

Presented by Les Goldsmith

Les Goldsmith is the National Sales Manager for Envirco, a manufacturer of filtration equipment for clean room and medical applications. He has worked with major pharmaceutical companies in meeting their filtration needs, and is well known in the clean room industry. Les has business degree from Bryant College. Mr. Goldsmith will be discussing fan filter units for clean rooms with emphasis on the use of ECM motors to provide energy savings as well as enhanced control and monitoring options.

A Certificate of Attendance will be available at the registration table

Meeting Details Location: AAAArcarorcarorcarorcaro & G& G& G& Genellenellenellenell

443 South Main Street, Old Forge, PA 18518 (570) 457-3529

Schedule: 5:00-5:45 p.m. Business Meeting (All are Welcome) 5:30-6:30 p.m. Social Hour (in the bar) 6:00-6:30 p.m. Program Registration 6:30-7:15 p.m. Dinner (Buffet) 7:15-8:30 p.m. Technical Presentation Cost: $ 30.00 per person FREE for Students (ASHRAE Members are encouraged to sponsor Students)

If You Are Planning to Attend If You Are Planning to Attend If You Are Planning to Attend If You Are Planning to Attend Please Respond by Please Respond by Please Respond by Please Respond by NNNNOONOONOONOON on on on on MONDAYMONDAYMONDAYMONDAY May 19May 19May 19May 19 ttttoooo Walt Janus at (570) 342Walt Janus at (570) 342Walt Janus at (570) 342Walt Janus at (570) 342----3700 Ext. 286 or via e3700 Ext. 286 or via e3700 Ext. 286 or via e3700 Ext. 286 or via e----mail at mail at mail at mail at wjanus@gpinet.comwjanus@gpinet.comwjanus@gpinet.comwjanus@gpinet.com

NEWS and Notes President’s Message, Continued

• The Wilkes University Student Chapter is officially chartered! Thank you to everybody involved, and please help continue to foster this relationship and bring new engineers into the HVAC&R world.

• We’ve received good feedback from members regarding the technical programs this year. If you have any comments or suggestions, please continue to let us know so we can help provide the knowledge we all need to be successful.

As usual, PDH certificates of attendance will be provided at our technical program next week. Thank you again for a great year, and I look forward to seeing you at the remaining events of 2013-2014. Matt Archey

Second Annual Car Show This Sunday The second annual car show benefiting Research Promotion will be held this coming Sunday May 18th from 10 am to 4 pm at the Wyoming Valley Mall in Wilkes-Barre. We are still seeking sponsors, volunteers, and of course participants to show their cars. For more information of to offer your support contact Ron Sibulsky or visit www.ashraecarshow.wix.com/info. Spread the word and plan to attend. A flyer is included on the next page which you can freely post and distribute.

Mark A. Hagan, PE Memorial Golf Outing Set for June 17 Details have been set for our annual golf outing to benefit the Chapter. The event will be held on Tuesday, June 17 at Blue Ridge Trail Golf Club in Mountaintop. Full details and a registration form follow on pages 5 and 6. Hope to see you there! Did You Know… This year marks the centennial of the invention of the first successfully marketed household electric refrigerator called the DOMELRE (a contraction of DOMestic ELectric REfrigerator). It was invented by ASRE Charter Member Fred Wolf Jr. and was marketed by the Mechanical Refrigerator Co. of Chicago and later by ISKO Inc. of Detroit. Although thousands were sold, the company went bankrupt in 1921. Fred Wolf Jr. was inducted into the ASHRAE Hall of Fame this past January. One of the DOMELRE refrigerating units, perhaps the only one extant, will soon be part of the ASHRAE Historical Archive in Atlanta. (Excerpted from The ASHRAE Historians Newsletter, April 2014.)

ASHRAE ANTHRACITE CHAPTER

2014 MARK A. HAGAN, P.E. MEMORIAL GOLF OUTING

TUESDAY, JUNE 17, 2014

Blue Ridge Trail G.C.

Once again, it's time to mark your calendar for the annual ASHRAE, Anthracite Chapter golf outing. This year,

we will be playing Blue Ridge Trail. We will be using a 11:00 AM shotgun start with scoring being captain &

crew. PLEASE NOTE THAT COURSE REQUIRES SOFT SPIKES. THESE ARE AVAILABLE AT COURSE IF YOU NEED

THEM.

Cost of golf and dinner is $ 100.00 per person. Dinner only cost is $ 50.00 per person.

Please plan to arrive 30 to 45 minutes early to register, get your cart and hole assignment, as well as practice

putting or driving.

Dinner will be at 6:00 PM, buffet style.

For reservations, call Jon Keller (570) 342-7778 or email at jon@jfohora.com. Reservations will be confirmed

when payments are received. Payments may be made payable to “ASHRAE Anthracite chapter” and mailed to

or Jon Keller, C/O Joseph F. O’Hora & Sons, Inc. 1400-02 N. Washington Ave., Scranton, PA 18509. All

payments and registration are due June 6, 2014 – PLEASE INCLUDE A POINT OF CONTACT PER FOURSOME.

This year we are soliciting hole sponsorships for the tournament. Companies sponsoring a hole will pay

$100.00 per hole. New permanent signs with sponsor names and company logo’s will be posted at each tee.

Send your company logo to Will Seiberling at William.seiberling@irco.com by June 6, 2014. Your hole

sponsorship is tax deductible and receipts are available upon request.

Directions:

South from Wilkes-Barre, take I81 south to Nuangola exit (#159). At stop sign, make a left turn, and proceed

3/10 of a mile to next stop sign. Make right turn and proceed 1 mile to stop sign. Make a left turn and proceed

1.8 miles. At Prospect Road make a right turn and go 1.3 miles. At the intersection (Country Club Drive), make

a left turn. Clubhouse will be on your right. Coming west from Pocono/Allentown area, take I80 west to exit #262, to route 309. Take route 309 north

approximately 1.5 miles. Make a left turn, there will be a sign pointing to get to interstate 81; go straight down

mountain 3.1 miles. Make a sharp left turn. Proceed 1.6 miles, then make a right turn into the development.

Continue straight 7/10 of a mile. Clubhouse will be on your left. Traveling north or east, take I81 north to exit #155 (Dorrance), Make a right turn to “T” in road. Make a left

turn, go 2.4 miles. Next make a sharp left turn and proceed 1.6 miles. Make a right turn into the development.

Continue straight 7/10 of a mile. Clubhouse will be on your left.

Call early for reservations. See you there. Course number: 570-868-4653.

2014 Mark A. Hagan, PE

Memorial Annual Golf Outing

When: Tuesday, June 17th

, 2014

11:00 am Shotgun Start

Where: Blue Ridge Trail Country Club

260 Country Club Drive

Mountain Top, PA 18707

Cost: Golf & Dinner $100 / Per Person

Dinner Only $50.00 / Per Person

Hole Sponsor $100 /Hole Singles and Foursomes are welcome!!

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

RSVP TO: PAYMENT TO:

Jon Keller ASHRAE Anthracite Chapter

570-342-7778 1400-02 N. Washington Ave

jon@jfohora.com Scranton, PA 18509

REGISTRATION FORM: Name Company Telephone

Golf & Dinner $100.00 /each =$

Dinner Only $50.00 / each =$

Hole Sponsorship $100.00 / each =$

ASHRAE Research

Donation

$ =$

Total Enclosed =$ USD

(Please remit payment by June 6th, 2014 including point of contact per foursome)

More NEWS and Notes Technology Corner This month’s technical article, “HVAC Design for Sustainable Lab” is attached at the end of the newsletter, and is courtesy of ASHRAE. Please submit ideas for future technical articles highlighting HVAC technologies or issues to John Durdan (jdurdan@HA-PA.com) for consideration. Call for Chapter Historical Items The Chapter archives are starting to fill up, but we still have more room available for any and all items related to the history of the Anthracite Chapter. Bring them to the next meeting or contact Dan Mello or Walt Janus to make arrangements to drop them off or have them picked up. ASHRAE Annual Meeting

Region III CRC Slated for Richmond, VA The Richmond Chapter will host the 2014 Chapters Regional Conference on August 21-23 in historic Richmond, Virginia. The conference will include technical sessions on Thursday, the business meeting on Friday, and chapter workshops on Saturday. Visit http://region3.ashraeregions.org/reg_3cd.htm for complete details and to register.

Thanks to Our Sponsors

The display of business cards in the NEWS recognizes the financial support of the Chapter by the individual or business and does not constitute an endorsement or recommendation by ASHRAE or the Anthracite Chapter.

Thanks to Our Sponsors

The display of business cards in the NEWS recognizes the financial support of the Chapter by the individual or business and does not constitute an endorsement or recommendation by ASHRAE or the Anthracite Chapter.

ANTHRACITE CHAPTER NEWS Walt Janus, Editor c/o Greenman-Pedersen, Inc. 50 Glenmaura National Blvd, Suite 102 Scranton, PA 18505

ASHRAE MISSION

• To advance the arts and sciences of heating, ventilating, air conditioning and

refrigerating to serve humanity and promote a sustainable world.

ASHRAE VISION

• ASHRAE will be the global leader, the foremost source of technical and educational

information, and the primary provider of opportunity for professional growth in the arts

and sciences of heating, ventilating, air conditioning and refrigerating.

2012-13 Tracey Jumper 2003-04 Dennis Gochoel 1994-95 John Walker 1985-86 Lee Garing 2011-12 A.J. Speicher 2002-03 Phil Latinski 1993-94 Dennis McGraw 1984-85 Spence Martin 2010-11 Tom Swartwood 2001-02 Mike Moran 1992-93 Scott Harford 1983-84 Donald Brandt 2009-10 Brian Flynn 2000-01 Dennis Gochoel 1991-92 Dan Mello 1982-83 Rich Santee 2008-09 Eric Zanolini 1999-00 John Durdan 1990-91 Mark Hagen 1981-82 Bob Mugford 2007-08 Walt Janus 1998-99 Matthew Martin 1989-90 Paul Dreater 1980-81 Kerry Freeman 2006-07 John Havenstrite 1997-98 Dean Butler 1988-89 Bud Reilly 2005-06 Manish Patel 1996-97 Charlie Smith 1987-88 Ray Suhocki 2004-05 A.J. Lello 1995-96 Chuck Swinderman 1986-87 Jerome Peznowski

Ant

hrac

ite C

hapt

er

Pas

t-Pre

side

nts

ANTHRACITE CHAPTER 2013-2014 MEETINGS & EVENTS

Date Theme Program Speaker

Sept. 17 Membership : Chapter-Sponsored Social Hour

Desiccant Technology Steve Blinn

Oct. 15 Bring-A-Buddy The Future of Refrigerants James Wolf**

Nov. 19 Students/YEA HVAC Noise and Vibration Control –

RTU Best Practices Steffan Kollevoll

December Family Night -- --

Jan. 14 Research Promotion Factors Influencing Electricity Cost Joe Clifford &

Denny McGraw Jan. 22 Road Trip AHR Product Show --

Feb. 18 Membership : Joint Meeting w/PSPE : Engineer’s Week

The PPL Susquehanna Nuclear Plant Joe Scopelliti

Mar. 18 Joint Meeting with

SMACNA

Duct Leakage Measurement and Effects on System Performance

Gerard Iacouzze

April 15 Students Variable Flow Chiller Plant Design Julian de Bullet*

April 17 ASHRAE Webinar IEQ and Energy Efficiency Panel

May 18 Research Promotion Car Show --

May 20 Past-Presidents Fan Filter Units for Clean Rooms Les Goldsmith

June 17 Fun & Fellowship Mark A. Hagan, PE Memorial Golf Tournament --

Aug. 21-23 Chapters Regional Conf. 2014 Region III CRC, Richmond, VA --

*ASHRAE Distinguished Lecturer **ASHRAE Presidential Member

24 AS HRAE Jou rna l ash rae .o rg S e p t e m b e r 2 0 0 8

Gregory R. Johnson, P.E., is an associate partner with Newcomb & Boyd Consultants and Engineers in Atlanta.

About the Author

HVAC Design for Sustainable LabBy Gregory R. Johnson, P.E., Member ASHRAE

Photo 1: Daylighting helped this laboratory achieve a LEED®-NC Gold rating.

HVAC systems in a typical laboratory facility can use five to 10 times as

much energy as the systems in a typical office building.1 This higher energy

use is due to many factors including 100% outside air systems; 24-hour-a-day

operation; high internal heat gains; high air change rate requirements; equip-

ment exhaust requirements; and high fan energy.

With this significant energy use, the incentive for creative sustainable design grows. Systems or system options that have lengthy paybacks in other facility

types are more likely to provide attractive and acceptable returns on investment in a laboratory facility. Additionally, many laboratories are constructed with a long-

term view by owner-operated institutions that not only can accept a longer payback period but who are committed to develop-ing sustainable facilities. The spending trend shown in Figure 1 suggests an increasing pressure to renovate existing laboratories and construct new facilities.2 In addition to the growth in total research, organizations including universities, gov-ernment agencies, and private research

Photo credit: Nick Merrick © Hedrich Blessing | Architect: Perkins+Will, Atlanta

The following article was published in ASHRAE Journal, September 2008. ©Copyright 2008 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. It is presented for educational purposes only. This article may not be copied and/or distributed electronically or in paper form without permission of ASHRAE.

Sep tember 2008 ASHRAE Jou rna l 25

Sustainable features such as low-flow plumbing fixtures, dual-flush flush valves, extensive circulation of domestic hot water, and rainwater recovery for nonpotable reuse are appropriate for nearly every building type. Some features of laboratory facilities offer additional water-saving opportunities. Two specific areas are process cooling and cooling coil condensate recovery.

Many laboratories house equipment such as nuclear magnetic resonance spectrometers, environmental room lasers, condens-ing units, and vacuum pumps that require process cooling water. Many locales permit the use of once-through domestic water—where domestic water is used and then discharged into the sanitary system—for process cooling. This should be avoided in new facilities and should be given high priority for upgrade in existing facilities. In lieu of once-through water, a recirculating process water system using building chilled water directly, a blended secondary chilled water loop, a dedicated process chiller and loop, or condenser water, should be con-sidered based on the process water loads and other building infrastructure. Providing domestic water as an alarmed backup system is a reasonable approach to increase redundancy and reliability for sensitive or critical loads.

With high quantities of outside air and 24 hours per day operation, the cooling coils in laboratory facilities can provide a significant source of water, which can be used for a variety of purposes including irrigation or a nonpotable water supply for toilet flushing and/or cooling tower makeup. For example, in a recently built laboratory in Atlanta, four 30,000 cfm (14 158 L/s), 100% outside air air-handling units were located in a penthouse. Using weather bin data information and an estimated cooling load profile, the estimated condensate recovery from the cooling coils exceeded 800,000 gallons (3 million L) per year, with a maximum flow of 19 gpm (1.20 L/s) (Table 1).

In this project, the cooling towers were located at a lower elevation than the air-handling units. The collected condensate could gravity drain to the cooling tower basin, where a three-way valve directed condensate to the tower basin to make up losses from evaporation, drift, and bleed. If condensate production ex-ceeds the cooling tower needs, the excess condensate is directed to the sanitary sewer system. If the condensate is inadequate to

make up the cooling tower needs, the domestic water system provides the necessary flow. As an added benefit, the condensate is cold, lowering the condenser water temperature and cooling tower fan energy required to reject chiller heat.

Cooling coil condensate could also be used for irrigation, sometimes in conjunction with rain water capture and reuse. An attractive aspect of the condensate flow is that, in humid climates, it is available even in a drought when irrigation needs are highest.

Air-Side SavingsThe most significant opportunities for reducing the environ-

mental impact of laboratory facilities are in the air-side design. Given the number of variables of function, user criteria, climate, and systems, it is impossible to cover all the features or ways to design a sustainable laboratory. The design must be customized and tailored for the specific application. However, with respect to laboratory air-side systems, a sustainable design should focus on three main goals:

Reduce the amount of outside air used to meet cooling and 1. ventilation requirements;Recover energy from the outside air that must be used; 2. andMinimize the amount of energy required to distribute air.3.

Reducing Outside Air Used for Cooling and VentilationNothing reduces the long-term energy use and environmental

impact more than reducing the amount of outside air used to meet the cooling and ventilation requirements. In a typical office building, the amount of outside air is dependent primarily on the ventilation requirements for people. In a typical laboratory facil-ity, on the other hand, the amount of outside air has three drivers: cooling load, exhaust makeup, and industry-expected minimum air change rate. With each of these drivers, several ways exist to attack and optimize the system. Each must be addressed, since the amount of outside air used is dependent on all of these items.

Reducing the Cooling LoadReducing the cooling load that is served with outside air

should be the highest priority in a sustainable laboratory.

350

300

250

200

150

100

50

0Ex

pend

itur

e D

olla

rs (

In B

illio

ns)

1953

1957

1961

1965

1969

1973

1977

1981

1985

1989

1993

1997

2001

2005

Figure 1: Research spending adjusted to 2006 constant. Courtesy AAAS.

Other

Private Industry

Federal Government

institutes compete for the same small group of talented researchers and use new and better facilities to recruit. Given the large number of laboratory facilities that will be constructed in the next decade, it is essential to minimize the energy use of these facilities to reduce operating cost, energy dependence, and greenhouse gas emissions.

Water—The Other ResourceAlthough HVAC energy use is often the

primary focus, another important part of sustainability is water conservation. In a sustainable facility, water use is mini-mized and water recovery is a priority.

26 AS HRAE Jou rna l ash rae .o rg S e p t e m b e r 2 0 0 8

This can be achieved via three methods: reducing the actual cooling load, using nonoutside air sources, and creative air distribution.

Reducing the actual cooling load in the laboratory is an excellent first step to achieve air-side savings. With smaller loads, a smaller HVAC system may be used, reducing not only energy use but also the capital cost, materials, and energy to install the system. When reducing the actual cooling load, there are some items that are relevant in any building and others that are laboratory facility specific. The general building issues take an added importance in the laboratory due to the hours of operation and the typi-cal use of 100% outside air for supply. Building envelope, especially fenestration and shading, should be carefully considered.

Daylighting, using natural light to illuminate a space and re-duce electric light use, is a common laboratory feature3 (Photo 1). Reducing the overall illumination levels and using task light-ing at work surfaces can also reduce the actual cooling load. With careful architectural design and fenestration selection, heat gain from the envelope and lighting can be reduced.

Lab Unit System With Heat Recovery Units

Temperature Bin

Heat Recovery Temperature (°F)

Enthalpy Btu/lb Air + Moisture

OA HRTime of Day

Supply HR Gallons01 – 08 09 – 16 17 – 24

102 88.3 33.01 0.01125 1 0.00921 132.1

97 85.0 34.39 0.01223 17 3 0.00921 3,917.3

92 82.6 35.07 0.01378 103 32 0.00921 39,970.5

87 80.5 34.01 0.01322 254 113 0.00921 95,286.9

82 78.7 33.09 0.01265 13 370 229 0.00921 136,596.5

77 77.0 33.10 0.01307 136 353 350 0.00921 210,192.3

72 72.0 31.50 0.01293 487 301 413 0.00921 289,942.0

67 67.0 27.76 0.01083 423 262 301 0.00921 103,299.2

62 62.0 24.40 0.00921 311 248 286 0.00921 0.0

57 57.0 21.37 0.00921 276 234 263 0.00921

52 52.0 255 213 241

47 51.0 243 200 222

42 50.8 249 158 201

37 49.7 228 108 135

32 48.0 166 57 80

27 45.9 79 23 32

22 42.5 33 8 10

17 39.1 13 3 7

12 35.7 7 2

7 32.3 1

2 28.9 1

–3 25.5

Total Gallons Per Year: 879,336.8

Table 1: Condensate recovery (Emory Winship Cancer Institute 3/19/2004).

A laboratory specific issue is rightsizing the system. Often laboratory facilities, in the absence of specific criteria, are constructed with a high allowance for user equipment, such as 10 W/ft2 or 15 W/ft2 (108 W/m2 or 161 W/m2). This is done based on historical practice and for flexibility. Research by the Lawrence Berkeley National Laboratory4 suggests that actual equipment loads in laboratories are typically lower, resulting in oversized systems and energy waste. Although designers should meet the user’s criteria and provide the desired flexibility, we should also evaluate what is actually required without undue excess.

Variable air volume (VAV) systems should also be used when possible to reduce the laboratory system cooling load by reducing supply airflow to match laboratory space load. While inappropriate for some spaces, such as high containment facilities, VAV is appropriate for many facilities, including those with highly variable cooling loads, low fixed equipment exhaust requirements and low minimum air change rates, and spaces with a high fume hood density.5 ANSI/ASHRAE/IESNA Standard 90.1-2004, Energy Standard for Buildings Except Low-Rise Residential Buildings, Section 6.5.6.1, requires either

28 AS HRAE Jou rna l S e p t e m b e r 2 0 0 8

they are known now, they will change in the future. Rather than designing the entire facility with the flexibility to accommodate heavy heat producing equipment, such as ultralow-temperature freezers or centrifuges, this equipment could be consolidated into a few smaller equipment spaces. These spaces could have high watt density criteria, while general laboratory spaces would use lower watt density criteria, ultimately reducing the overall design load. Locating heat-producing equipment in areas where

VAV or heat recovery for 100% outside air systems more than 5,000 cfm (2359 L/s). The designer of a sustainable laboratory should consider using both where appropriate.

Another way to reduce the actual cooling load is with labo-ratory equipment consolidation and placement. Laboratories often are designed as flexible spaces with general criteria rather than specific requirements. The actual users and their research program may not be known during facility design and, even if

high supply airflow quantities already are required for exhaust fan makeup or minimum air change requirements makes dual use of the supply air and reduces the need for reheat. Reducing the actual cooling load, when using 100% outside air for cooling, is critical in any sustain-able laboratory design.

Although reducing the actual cooling load is an important first step, once the load is minimized, another approach to reducing the amount of outside air used for cooling is to use non-air sources to meet as much of the cooling load as pos-sible. For example, with the previously discussed consolidation of laboratory equipment into an equipment room, the resultant space could have a tremendous watt density, perhaps 50 W/ft2 (538 W/m2), and a corresponding high amount of cooling air would be required to serve the space. While the consolidation can provide design load reduction savings over a distributed approach, significant energy use reductions can be made by using a small dedicated recirculating unit to cool most of the sensible load. Some outside air is still supplied to the space for ventilation and minimum air change requirements but the majority of the sensible load is cooled with chilled water, eliminating the penalty of using 100% outside air as a cooling source. Another approach, commonly used in Europe, but now gaining popularity in the U.S., is the chilled beam6 (Figure 2).

A chilled beam is a ceiling-mounted induction unit. Primary air from a 100% outside air air-handling unit is ducted to the chilled beams and provides latent and some sensible cooling. Blended second-ary chilled water at a slightly elevated temperature is piped to the chilled beams. The movement of the primary air past the beam induces room airflow through the beam where it is cooled by the coil. The result is a sensible cooling capacity

Advertisement formerly in this space.

Sep tember 2008 ASHRAE Jou rna l 29

Figure 2: Chilled beam, which is a ceiling-mounted induction unit.

with a significant, perhaps 60%, reduction in coil load and en-ergy use. The energy reduction occurs because with a greatly reduced outside airflow, air-handling unit coil load is reduced, even though the space cooling load is essentially the same. The chilled beams have no moving parts, require no electrical connection and require no maintenance beyond an occasional vacuuming of the induction coils. Non-air sources should be considered for laboratory spaces with high sensible cooling loads to reduce energy use.

Air-distribution design and zoning offer additional opportu-nities to reduce the amount of outside air used for cooling and ventilation. The most obvious approach is to provide separate laboratory systems for laboratory spaces and to serve nonlabo-ratory spaces with systems that recirculate air and may have reduced pressure and filtration requirements. In some designs, laboratory spaces and office spaces can be intermixed, making separate systems for air distribution more difficult.

Another opportunity is using transfer air to reduce the cool-ing load served directly by supply air. For example, in a recent project a freezer alcove was attached to a large open lab. The general laboratory exhaust grilles for the large open lab were located in the freezer alcove above the freezers. With this signifi-cant airflow, much of the load from the freezers was captured in the exhaust air before entering the room, reducing the required supply airflow to the space and the amount of outside air used for cooling. In a similar issue, fume hoods located in small enclosed rooms increase energy use. A preferred approach is to locate hoods in larger spaces, where hood exhaust require-ments more closely align with cooling and minimum air change supply air requirements or in open alcoves off larger spaces to reduce airflow. Creative zoning and air-distribution system design can be used to reduce the amount of outside air used for cooling and energy use.

Reducing Exhaust and Exhaust MakeupA second driver in the amount of outside air used for cooling

and ventilation is the airflow required to make up exhaust from laboratory spaces and equipment. Devices such as fume hoods, biological safety cabinets, snorkels, and canopy hoods are used to provide containment and local capture of odors and harmful materials and to remove heat and moisture. Equipment exhaust requirements can vary greatly between different facilities. In biomedical research facilities, there is a trend towards less chemical use and fewer exhaust devices, making it unlikely that

Ventilation Air

Ventilation + Induced Air (1:3 Ratio)

Coil Coil

Induced Air

Ceiling

Advertisement formerly in this space.

Sep tember 2008 ASHRAE Jou rna l 31

the HVAC system and the outside airflow would be driven by equipment exhaust requirements. However, in an undergraduate chemistry lab, with a large number of fume hoods, the outside airflow would be highly dependent on the equipment exhaust requirements. Methods to reduce exhaust airflow in laboratories include VAV hoods, low-flow hoods and transfer air.

In a VAV hood, the amount of air exhausted through the hood is varied based on the sash position to maintain a constant face

to 2600 L/s). This had a net effect of reducing overall building energy consumption by 10%.

Another option gaining some acceptance with laboratory planners is to actually return air from labs. Laboratory de-signers are recognizing that a “lab” can mean many different things. For example, is it necessary to exhaust the air from a physics or laser lab? The requirement for 100% exhaust really depends on what is going on in the space and the results of

velocity across the opening regardless of sash position. This approach is most effective in laboratories without high constant heat loads and where there are a large number of hoods. In laboratory spaces with a small number of hoods, high steady cooling loads, or high mini-mum air change rates, VAV hoods, with additional complexity and cost, may provide little or no benefit. In some cases, low-flow or high-performance hoods may be a good option to reduce exhaust airflow. These hoods require a lower hood face velocity to maintain containment and may reduce makeup air require-ments, depending on the lab cooling load, minimum air change requirements and number of hoods in the space. With ei-ther VAV or high-performance hoods, an analysis of the space should be performed to ensure that the features of the system provide benefit. In addition to looking at the end devices, a designer should look at the supply side.

The air requirement for laboratories is often stated as “Laboratories must be served with 100% outside air.”7 However, per AIHA/ANSI Z9.5-2003, Laboratory Ventilation, the actual requirement is that “Air from laboratories shall not be recirculated.” Recently, a new school of medicine, including a gross anatomy laboratory, was constructed. While the laboratory spaces have significant ventilation and exhaust requirements, the facility also included many offices, large lecture halls, and teaching spaces. The quantity of ventilation air to comply with ANSI/ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality, in these spaces greatly exceeded the airflow required to pressurize the building. Rather than relieve this excess ventilation air, it was routed as return air to the anatomy lab air-handling unit, reducing the outside airflow for that unit from 25,000 cfm to 5,500 cfm (11 800 L/s

Advertisement formerly in this space.

32 AS HRAE Jou rna l S e p t e m b e r 2 0 0 8

the risk analysis. With increasingly sophisticated laboratory equipment, quantities of chemicals and the associated risks are being reduced in many facilities to where returning lab air from such dry lab spaces may be appropriate. Obviously, input from the laboratory planner, facility health and safety officer, and users are required to determine if returning air is appropriate. However, exhausting all air from spaces where there is no or miniscule risk to health or safety without considering options is inappropriate as we look to create facilities that minimize environmental impact.

Reducing exhaust quantity and the corresponding makeup air should be a high priority in designing a sustainable laboratory.

Minimize Air Change Rate RequirementsNo single subject generates more discussion in ASHRAE

Technical Committee 9.10, Laboratory Systems, than the topic of determining the appropriate minimum air change rate in labo-ratories. Air change rate is calculated by dividing room volume by exhaust airflow in cfm. ACH is often inappropriately used to indicate a safe level of dilution. However, AIHA/ANSI Z9.5 indicates that ACH is a poor indicator of lab safety. Technical publications such as ASHRAE Handbook, NFPA 45, Standard on Fire Protection for Laboratories Using Chemicals, and AIHA/ANSI Z9.5 provide some historically used values but these values are rules of thumb and are not based on a specific scientific basis. However, since these numbers, generally six to 12 air changes per hour, are recommended, a laboratory designer would be open to scrutiny for deviations from this range.

The goal of minimum air change rates is to ensure that, even in the case of some undefined chemical spill, some level of safety, either for exiting or spill clean up is maintained. An analysis of chemical spills of 1 L (0.26 gallon) of various chemicals charted against the number of air changes necessary to maintain the environment below the TLV, shows that for a majority of chemicals, six air changes per hour provides a safe environment. Several other chemicals exist, such as formaldehyde, where the air change rate necessary to maintain a safe environment after a 1 L (0.26 gallon) spill exceeds 50. Increasing the minimum air change rate from six to eight or even 10 provides no significant benefit in this situation, but does come at a significant energy penalty, especially in laboratories where the cooling loads and exhaust requirements are low.

ASHRAE is working with other organizations such as CDC and AIHA to explore developing a laboratory classification system that could provide some guidance to laboratory design-ers regarding appropriate design including minimum air change rates. Once the required minimum air change rate is defined, using setbacks to reduce the minimum during unoccupied periods should be considered.

Energy RecoveryOnce the amount of outside air used to meet the cooling and

ventilation requirements is minimized, the next target should be to capture energy from the exhaust streams to precondition the required makeup air. Historically, runaround heat recovery

Advertisement formerly in this space.

34 AS HRAE Jou rna l ash rae .o rg S e p t e m b e r 2 0 0 8

systems have been used in laboratory systems due to simplicity, flexibility and the assurance of no cross-contamination between the exhaust and makeup airstreams. Unfortunately, these sys-tems are only about 50% efficient in capturing sensible heat and capture no latent heat. In some laboratory facilities, a better ap-proach for heat recovery is the use of desiccant wheels. With this system, the exhaust and supply airstreams are brought adjacent to one another, and sensible and latent energy is captured via a rotating metal or fibrous wheel impregnated with desiccant material. Energy recovery wheels can have total efficiencies of about 80%. While the energy recovery wheels have improved efficiency, they also have a potential for cross-contamination of the exhaust and supply airstreams. For this reason, wheels have historically only been used for laboratory general exhaust. Fume hood exhaust and other highly corrosive or toxic exhausts were handled with separate systems, perhaps with a separate runaround heat recovery system.

Some facilities are now using energy wheels in combined general laboratory and fume hood exhaust systems where the number of fume hoods is small compared to the general exhaust requirements. In this application, it is necessary to analyze the chemicals to be used in the facility and the implications of a spill inside a hood to determine if cross-contamination would provide an unacceptable supply air condition.

Where the risk assessment shows that some chemicals or processes are inappropriate for the energy recovery wheels, some hoods connected to an independent exhaust system can be provided. While this design approach is not widespread, its use is growing.

Minimize Distribution EnergyFinally, we should reduce the amount of energy required to

distribute the supply and exhaust air. Many of the options in this category apply to all building types. For example, low-pressure drop coils can be used. Variable speed drives can be used to match the system to the load. Air distribution systems should be designed for low velocity with carefully selected fittings and to avoid system effect. Laboratory specific issues include: thoughtful consideration of the exhaust system design, minimizing penalties associated with heat recovery, and analysis of exhaust stack discharge options.

In the exhaust system, exhaust devices with similar pressure requirements should be grouped together to minimize fan static pressure requirements and energy use. For example, a Type B2 biological safety cabinet has a pressure drop of about 2.0 in. w.c. (498 Pa), while a fume hood and the general exhaust grilles may have a pressure drop of only 0.15 in. w.c. (37 Pa). If a small number of devices with high-pressure-drop forces the operation of the whole larger system at a higher pressure, then energy is wasted. A more sustainable approach would be to separate the high-pressure drop systems onto a dedicated exhaust system and operate the larger system at a lower, more efficient pressure.

While designing energy recovery systems, it is wise to look for creative ways to gain additional use from the system and

minimize penalties. For example, heat recovery coils in the sup-ply and exhaust airstreams increase the system resistance and fan energy necessary to move the air. Often these fan energy penalties can reduce the energy savings and greatly increase the payback for heat recovery systems. Thoughtful design features, such as a small bypass in parallel with heat recovery coils or wheels can greatly reduce the pressure drop across the device when not in use and maximize the energy savings.

Traditionally, exhaust stacks have been designed with con-stant speed exhaust fans at a high velocity discharge to, along with a high stack, eject the effluent out of the recirculation zone around the building (Chapter 16 of ASHRAE Handbook—Fundamentals). This high velocity discharge can add 0.5 in. w.c. to 1.0 in. w.c. (125 Pa to 249 Pa) of pressure to the system and, with constant speed fans operating 24 hours a day, the energy use can be significant. While uncommon, multiple alternatives to the traditional approach exist including:

Variable discharge velocity with CFD or wind tunnel •confirmation of safety;Special discharge dampers that permit variable speed fans •with constant discharge velocity;Multiple fans with fan staging; and •Staging multiple stacks off a common exhaust header. •

ConclusionLaboratories require significant resources to construct and

operate and the number of laboratory facilities will continue to grow. HVAC designers should consider methods to reduce a facility’s impact on the environment by reducing water use and recovering water for reuse where appropriate. While the designer’s first obligation is to the safety of the laboratory users, visitors and maintenance personnel, it is possible to creatively reduce the energy use of facilities. Reducing quantities of outside air used for cooling and ventilation, using recovered energy, and reducing distribution energy are methods to design sustainably. Together owners, users, architects, laboratory plan-ners and engineers can find creative ways to design safe and sustainable laboratories for the future.

ReferencesUnited States Environmental Protection Agency and Federal En-1.

ergy Management Program. 2000. Laboratories for the 21st Century: An Introduction to Low-Energy Design p. 1.

Cordes, E. 2008. “Federal Funding for Research: Implications for 2. Lab Design.” Keynote Speech, Laboratory Design Conference.

Perkins+Will. 3. Frenze, D., S. Greenberg, P. Mathew, D. Sartor, and W. Starr. 4.

“Right-Sizing Laboratory Equipment Loads.” Lawrence Berkeley National Library, November 2005.

ANSI/ASHRAE/IESNA Standard 90.1-2004, 5. Energy Standard for Buildings Except Low-Rise Residential Buildings.

Rumsey, P. and J. Weale. 2007.” Chilled Beams in Labs: Elimi-6. nating Reheat & Saving Energy on a Budget.” ASHRAE Journal 49:(l):18.

United States Environmental Protection Agency and Federal En-7. ergy Management Program. 2000. Laboratories for the 21st Century: An Introduction to Low-Energy Design p. 2.