Energy-Saving Designs for Existing Buildings

Energy-Saving Designs for Existing Buildings Presented by: Dan Watkins, LEED AP Bornquist, Inc.

Topics to Cover ,[object Object],[object Object],[object Object],[object Object],[object Object]

Designing for Efficiency ,[object Object],[object Object],[object Object]

Equipment Efficiency ,[object Object]

System Efficiency ,[object Object]

Payback Considerations ,[object Object]

System Design Examples ,[object Object],[object Object]

Variable Speed Pumping Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Variable Speed Pumping ,[object Object],[object Object]

Variable Speed Pumping GPM 2 GPM 1 HEAD 2 RPM 2 RPM 1 HEAD 1 HP 2 HP 1 RPM 2 RPM 1 RPM 2 RPM 1 HP 2 HP 1 GPM 2 GPM 1 GPM 2 GPM 1 HEAD 2 HEAD 1 Affinity Laws 2 2 3 3 = = = = =

Variable Speed Pumping ,[object Object],Pump Selected at: 1000 GPM @ 100’ 40 HP required. Duty Point: 30 HP Oversized by 15% 15’ head on TDV X

Variable Speed Pumping ,[object Object]

Variable Speed Pumping Example ,[object Object],[object Object],[object Object],[object Object],[object Object]

Variable Speed Pumping Example ,[object Object],SENSOR ACROSS COIL Typical Setting Equals Design Pressure Drop Across the Coil, Control Valve, and Circuit Setter. Coil 10 - 15’ P.D. Control Valve 10 - 15’ P.D. Typical Total P.D. 20 -30’

Variable Speed Pumping Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Variable Speed Pumping Example ,[object Object],PE Motor

Variable Speed Pumping Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Variable Speed Pumping Example ,[object Object]

Efficient Boiler Design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Efficient Boiler Design ,[object Object],[object Object],[object Object]

Efficient Boiler Design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Efficient Boiler Design ,[object Object],[object Object],[object Object],[object Object]

Efficient Boiler Design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Efficient Boiler Design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Maximizing Efficiency

Efficient Boiler Design – Outdoor Reset

Efficient Boiler Design ,[object Object]

Efficient Boiler Design ,[object Object],Energy Use Per Unit of Load (e.g., HDDs) Energy Use (Therms, DecaTherms, etc.) Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun

Efficient Boiler Design ,[object Object],New Energy Use Per Unit of Load (e.g., HDDs) Old Energy Use Per Unit of Load (e.g., HDDs) Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun

Efficient Boiler Design ,[object Object],Total HDD x Best Therms/HDD = What’s Possible Total Therms – What’s Possible = What Was Wasted The E/L Curve Fast Calculation… Best ? Billing Period Therms HDDs Therms/HDD December January February March etc Total Therms Total HDD

Efficient Boiler Design ,[object Object],10 GPM 10 GPM 60 GPM 20 Gallons in boiler at 170 °F. At 10 GPM and 100 MBH load At 800 MBH firing, boiler will hit 190 °F in about 20 seconds. BOILER 800 MBH Output

Efficient Boiler Design ,[object Object],Added piping increases boiler volume…but to what extent? Adding 20 Ft. of 3” pipe adds 7.6 gallons Firing increases from 20 seconds to 25 seconds!

Efficient Boiler Design ,[object Object],Using a buffer tank to add 200 gallons will increase firing to almost 3 minutes for a 20 °F delta T. Using reset on the system loop could allow for a 50 or 60 °F delta T. Using a 60 °F delta T would mean a minimum run time of over 8 minutes!

Efficient Boiler Design ,[object Object],180 140

Efficient Boiler Design ,[object Object],Condensing Boiler Non-condensing Boilers

Efficient Boiler Design ,[object Object],Non-condensing Boilers BufferTank Condensing Boiler

Final Thoughts ,[object Object],[object Object],[object Object]

Energy-Saving Designs for Existing Buildings

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Energy-Saving Designs for Existing Buildings