The value in mechanical & electrical retrofits

What Pays and what Doesn’t?

June 16, 2011

Mark Kesseler

Director of Construction & Physical Operations

Greenwin Inc.

Driving Forces behind Retrofits

• End of useful life of equipment• Rising energy costs • Energy savings potential• Available incentives Federal, Provincial, Municipal, LDC’s• Green initiatives Lower carbon footprint, Corporate marketing

** Energy Audits ** Identify specific consumption

Boiler Selection

• Mid-efficient copper 85%

• Condensing copper to 95%

• Cast iron sectional 85%

• Fire tube 85%

• Instantaneous hot water heaters to 98% efficient

• Atmospheric 80%

Piping Design

PUMP

Reverse return piping with constant flow through each boiler.

Piping Design

PUMP

Supply return piping with pump controlled flow to each boiler.

P P P P

P P P P

Primary/SecondaryPiping withModulating boilers

Piping Design

P

Domestic Hot Water Systems

Domestic Hot Water Systems

• 200 Gallon Storage or Less

• External Plate & Frame Hx

• Variable Frequency Drives

• DDC Load Monitoring• DDC Optimization• Pipe Insulation

Near instantaneous DHW system

Make Up Air Systems

Gas fired duct heater Glycol heated coil

Suite Heating

Modulating Valve Control Injection Pump Control

MUAHX

DHWHX

Cold

Recirculation

DHW to Bldg.

To and From MUA East & West

Primary Pump (VFD)

P

P

P

P

P

Suite Heating LoopAnd SuitePumps

New combined heating plant total 9-11 MBTU Pending heat loss calculation confirmation.3 boilers based on heat loss and boilerSize selection.

Primary Secondary Injection System

Why Primary Secondary Piping Systems?

Allows for boiler redundancy Boilers operate in the most efficient temperature range Boilers are operated to match building load at any given

time Primary loop flow control via VFD (i.e. summer DHW

load) One heating plant supplies all ancillary heating systems of

the building from hallway make up air, DHW, suite heating, garage heating etc.

Variable Frequency Drives (VFD)

• Cold water booster pumps

• Make up air fans

• Primary boiler pumping

• Injection pump

Large horsepower electric motors operating at 70% FLA can save up to 50 % of the electrical consumption

Direct Digital Controls (DDC)

• Boilers and Pumps

• Suite Heating

• Ventilation (Scheduling)

• DHW Systems

• Garage & Ramp Heating

• Garage Exhaust ( C.O )

• Booster Pump

Summary

Maximizing natural gas savings in residential high-rise buildings is a combination of ;

• Efficient boilers in proper piping configuration

• Heating plant turn down ratio to match building loads

• System load monitoring through DDC

• Instantaneous low storage DHW systems.

• Variable frequency drives and ventilation scheduling • When properly designed primary secondary piping systems combined

with efficient boilers, instantaneous DHW systems, suite heating control and accompanied by DDC, will achieve natural gas savings in excess of 25%, while providing a multi-residential building with a reliable efficient heating plant.