1. The value in mechanical & electrical retrofits What Pays and what Doesnt? What Pays and what Doesnt? June 16, 2011 June 16, 2011 Mark Kesseler Mark Kesseler Director of Construction & Physical Operations Director of Construction & Physical Operations Greenwin Inc. Greenwin Inc.

2. Driving Forces behind Retrofits End of useful life of equipment Rising energy costs Energy savings potential Available incentives Federal, Provincial, Municipal, LDCs Green initiatives Lower carbon footprint, Corporate marketing ** Energy Audits ** Identify specific consumption

3. Boiler Selection 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%

4. Piping Design Piping Design PUMP Reverse return piping with constant flow through each boiler.

5. Piping Design Piping Design PUMP Supply return piping with pump controlled flow to each boiler. PPPP

6. PPPP Primary/Secondary Piping with Modulating boilers Piping Design Piping Design P

7. Domestic Hot Water Systems

8. 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

9. Make Up Air Systems Gas fired duct heaterGlycol heated coil

10. Suite Heating Modulating Valve ControlInjection Pump Control

11. MUA HX DHW HX Cold Recirculation DHW to Bldg. To and From MUA East & West Primary Pump (VFD) P P P P P Suite Heating Loop And Suite Pumps New combined heating plant total 9-11 MBTU Pending heat loss calculation confirmation. 3 boilers based on heat loss and boiler Size selection. Primary Secondary Injection System

12. Why Primary Secondary Piping Systems? Allows for boiler redundancy Allows for boiler redundancy Boilers operate in the most efficient temperature range Boilers operate in the most efficient temperature range Boilers are operated to match building load at any given time Boilers are operated to match building load at any given time Primary loop flow control via VFD (i.e. summer DHW load) 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. One heating plant supplies all ancillary heating systems of the building from hallway make up air, DHW, suite heating, garage heating etc.

13. Variable Frequency Drives (VFD) 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

14. Direct Digital Controls (DDC) Direct Digital Controls (DDC) Boilers and Pumps Suite Heating Ventilation (Scheduling) DHW Systems Garage & Ramp Heating Garage Exhaust ( C.O ) Booster Pump

15. 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.