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3708 W. Deer Crossing Dr, Stillwater, OKNew Construction 2010

4 year results: Ground Source Heat Pump SystemFind online at youtube.com search igshpa

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New System to install: Closed-Loop Ground Source Heat Pump with Desuperheater

• Foundation poured December 26, 2008

• Home size: 6,000 SF• Layout: 2 story,

ductwork in attic, HPs in attic.

• 2.5 acres.• Recommended

Tonnage: 9 Ton• Ground Loop: 6 Loop

Wells 300’ deep• HPs 2, 3 & 4 Ton

• Move in date June 1, 2010• 5 bids to install heating cooling

systems

Final Accepted Bid for GSHP System 2009(complete installation ducts, units, new construction)

• Conventional System Gas, electric would have cost: $30,000• GSHP System 9 Tons 3 units 2, 3, and 4 ton

– Loop 6 bore holes 300’ deep 1” HDPE $8,100– Headering $4,124– Inside Piping $3,912– Unit Delivery $17,697– Rough in $9,084– Final and Start-up

$2,402 Total $45,321– 30% tax credit -$13,599– $200 per ton from Stillwater, OK electric utility -$1,800 Total cost for the GSHP system $29,922

• Final cost for GSHP System less than a conventional system and projected annual cost $959 or $80 per month. 3

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GSHP Installation: Contractor Information

• Location: Goldsby, OK• 85 miles from Stillwater• Website:

comfortworks.us• HVAC Specialty:

Geothermal (IGSHPA Certified)

• Ownership: Chris Ellis• Background Information:

Established 1975 as C&S Heating and Air Cond., Inc Sold in 2007 and became Comfortworks, Inc.

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GSHP New Construction Equipment:ClimateMaster Tranquility 27 Design

Features

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GSHP New Construction Equipment

2 Ton UNIT 3 Ton UNIT 4 Ton UNIT

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Site Plan Drilling Locations: Preparing the Property •Drill sites location:

concerns for containment of mud and water runoff in street and adj. property.•Design Recommendation 3,600’ for Loop field. •Site needs 9 tons so six boreholes will be drilled to 300’ for a total of 1800 feet using 1 inch HDPE pipe.•Recommended spacing between boreholes was 25’.

•All underground utilities flagged prior to drilling and digging

Home

Drill site #1

#1#2

#4

#3

#5

15’

25’

#6

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Flag Drill site #1

Site Plan Drilling Locations: Preparing the Property

Short Casing

20’ Drill Pipe

Mud Ring

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Drilling the boreholes •Drilling rig is brought onto site•Make sure site is cleared and ready for drilling•Cuttings in the form of mud may come from the boreholes.•In the city, a reclaim unit can be used to contain the cuttings from going into sewer drain.•Deer Crossing site is on 2 ½ acres with adequate area for runoff without going into street or sewer drain.

Cuttings

Runoff

Bricks MovedM

ud fr

om B

oreh

ole

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Heat Exchange Pipe Loop for Boreholes

600 feet of 1” HDPE Pipe in borehole with about 5 feet sticking out

1 inch HDPE pipe loop is placed in each borehole to serve as a heat exchanger between the earth and heat pump

HDPE Pipe comes with U-Bend thermally fused and tested 610’ long

HDPE Pipe is placed on spool, pressure checked with water and sealed by bending ends prior to inserting into borehole.

The HDPE pipe is then lowered to the bottom of the borehole with weight of water and weight of a 1” x 8’ steel rod attached to end.

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Grouting the boreholes

BH 20 Grout is a Black Hills 20% solids, modified Bentonite Grout  which requires no polymer additives and is a complete mineral based product. Once placed, BH 20 Grout will set into a semi-rigid plug of the borehole.

Grout mixer

Mixing the borehole Grout

•Grout is pumped into each borehole from the bottom up through a tremie pipe.

•The grout serves several purposes.

• Seal the hole to prevent aquifer

contamination• Bond to the pipe• Serve as an exchange medium

between the earth and the pipe

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Grouting the boreholes

Inserting the tremie pipe

Grout pumping from bottom of borehole to the top.

Grout fills borehole displacing water

Pumping Grout into boreholes

•Tremie pipe is 1st pushed into borehole to the bottom of the borehole.

•Grout is pumped into each borehole from the bottom and is gradually pulled up filling any voids.

•Settling of grout can be expected.•As grout settles in each hole, it is refilled to top it off

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Connecting the boreholes Trench is dug to place header pipe connecting the ground loop with the heat pump units in the home.

4-5 foot deep trench 12” wide for header piping

All open pipe are taped or plugged to prevent dirt from getting into pipe.

All pipe fittings are socket fused producing a joint stronger then the pipe.

Butt weld fusion joint is stronger than pipe

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Connecting the ground loops with the heat pumps through a reverse return header.

4-5 foot deep trench is dug to reduce thermal losses between loops and heat pumps. Depth also prevents damage to lines from landscaping.

Trench connects header circulation pipes to house utility room and then to Heat Pumps

Borehole Loops are connected to header circulation lines using Reverse Return

•Headers are thermally fused at each connection and lines are pressure tested prior to filling in trenches

Header pipes are pressure tested to ensure no leaks

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To Heat Pumps

27 GPM Max Flow

2”

2”

2”

2”

2”

2”

1 1/4”

1 1/4” 2”

1”

1”

1”

1”

1”

1” 1”

1”

1” 1”

1” 1”

Diagram of Header System with Reverse Return for Cooling

Ground Loop6 Boreholes 300’ Deep1” HDPE pipe

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Covering up the Header and Trenches •Trenches are filled in and yard

brought to rough grade condition•Professional operators leave the area, as good as, or better than before.

•Location of each borehole loop and the header system is located using metal plates and GPS.

Trenches are filled in and yard brought to rough grade condition

Care is taken to cover the trench and mix cuttings with soil.

GPS is used for location of boreholes and header system

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Ductwork Return and supply boots were installed in each room except bathrooms and kitchen to minimize pressure imbalances,improve privacy, and is quiet.

The first step in installing ductwork is to read the floor plan and locate the supply and return vents.

Ductwork is sealed, insulated, wrapped and properly supported.

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Location of HP and Utility rooms

3Ton

2Ton

4Ton

Location of 3 Ton Unit 2nd floor South Utility room For 1st floor bedroom zone conditioning

Location of 4 & 2 Ton Units 2nd floor North Utility room for 2nd floor conditioning

HT

HT

Location of Purge and Flush Controls Garage Utility room

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•Lines are brought into garage utility room for connection to heat pump units in attic.

•Each connection/joint is thermally fused to ensure closed and sealed flow of water in pipes.

Circulation Pipes in the Home

Lines from ground loop are brought under foundation and up into garage utility room

Thermal fusing of pipe connections

Heating HDPE pipe and socket tee for thermal fusing of pipe connections

Purging and flushing connections in garage utility room

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Heat Pump Installation•Location in utility rooms 2nd floor attic space.•Three units are installed

•2 Ton Climate Master – Tranquility 27•3 Ton Climate Master – Tranquility 27 with desuperheater

•4 Ton Climate Master – Tranquility 27 with desuperheater

Tranquility 27 2 Ton UnitTTV026AGC01ALKSfor cooling/heating 2nd floor zone

Tranquility 27 3 Ton UnitTTV038AGC01ALKSfor cooling/heating 1st floor bedrm/study zone

Tranquility 27 4 Ton UnitTTV049AGC01ARKSfor cooling/heating 1st floor Living rm/kit zone

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Circulation Pipes in the Home

•Since circulation lines will run through the attic, antifreeze is added to prevent freezing of lines during winter.

•Insulation is added to pipes in attic

Circulation HDPE pipes in attic are insulated

Pipes are connected to Heat Pump Units in attic.

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Finalizing Pipe Loop Installation

Each HP unit has a High efficiency pump for circulation between heat pump and ground loops

Inline air bleeder to burp off any future trapped air.

4 Ton HP has two circulation pumps

Ground Loop and Heat Pumps are connected to flushing and purging cart.

Flushing and purging cart is used to eliminate any air in the system.

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Connecting Desuperheater to Hot Water Tank •Desuperheater is connected to

supplement hot water heater with hot water generated from Tranquility unit’s heat exchanger

•New electric hot water heater •Water heater could be put on timer to take advantage of Time of Use Rate (1:00 p.m. to 7:00 p.m. peak period)

Desuperheater lines connected to electric hot water heater

New electric hot water heater connected to desuperheater

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Insulation of pipes in attic and Programmable Thermostat

•All pipes in attic running from ground loop are insulated to prevent sweating in fall and spring.

•New programmable thermostats installed and set for Time-of-Use rate

New Downstairs Furnace/Air Handler

New Programmable ThermostatProgrammed to time of use.

1st thru 4th Year Money & Energy Savings Results

*Projected cost per month $80 GHP Actual average cost per month $66

 

Total Elec. for lights, cooking, GHP     1st Year 2nd Year

3rd Year

4th Year

Total SF =   6000 6000 6000 6000Total kWh =    22945 21573 23054 23607

Aver. kWh/day =   63 60 62 64Total Electric for year $ =    $1,742 $1,802 $1,872 $2,019

Average Monthly Electric Bill =    $145 $150 $156 $168Average Monthly kWh =    1,912 1,798 1,874 1,967Average Cost Per Day =   $4.82 $4.90 $5.13 $5.53

Plug Load = $92 $77 $83 $88

Geothermal Heat Pump System Cost Average mo. Electric for GHP       

*Average mo elec bill – Plug Load =   $53 $73 $73 $80Total Elec for GHP 1st yr=   $636 $876 $876 $960

Average Cost Per Day =   $1.74 $2.40 $2.40 $2.63Average Cost Per SF/year=   $0.11 $0.15 $0.15 $0.16

GHP Cost $45,321 Conv Cost $30,000Tax credit 30% +$200/ton

Final cost $29,922

*Projected cost per month $80 GHP Actual average cost per month $70

4 year Comparison Total Electric Cost/Month

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Winter Rates Oct-Apr$.09376/kWh >600 kWh =$.05727/kWh

Summer Rates May –Sep $.10126/kWh

2013-2014Aver. $168/mo.

2011-2012Aver. $150/mo.

2010-2011Aver. $145/mo.

2012-2013Aver. $156/mo.

Cos

t/Mon

th

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3708 W. Deer Crossing Dr, Stillwater, OKNew Construction 2010

Ground Source Heat Pump

More Details can be found at http://www.youtube.com

Search for IGSHPA and videos listed as Home 1-6

Accredited Installer WorkshopIGSHPA Stillwater, OK

• The three day comprehensive Installation Workshops are designed for GHP developers, architects, manufacturers, distributors, dealers, installers, HVAC contractors, trenching/drilling contractors, and anyone who desires a working knowledge of this innovative technology.

http://www.igshpa.okstate.edu/training/accredited.htm

Call 800-626-4747 

Accredited Driller WorkshopIGSHPA, Stillwater, OK

• This workshop will train individuals on proper construction and completion methods for vertical GeoExchange boreholes. Accreditation as an “Accredited Vertical Loop Installer”

• Who should attend? Water Well Drillers, Water Well Contractors, Drilling Company Administrators

• Applications of Production Drilling and Borehole Construction for GeoExchange Systems course

http://www.igshpa.okstate.edu/training/drillers.htm

Call 800-626-4747

Certified GeoExchange Designer (CGD)PLUS and Online Course, IGSHPA, Stillwater

• From an introduction to the technology to a complete review of the design process, participants learn the specific information they need to know to be a successful GeoExchange Designer.

• As an architect or engineer or designer, you have specific questions about GHP systems that you want answered.

• CGD Certification is offered by IGSHPA and AEE as an industry standard.

http://www.igshpa.okstate.edu/training/cgd.htmCall 800-626-4747