DOE-2 Energy Modeling Summary - Courthouse
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90% motor efficiency
Constant speed
Secondary Chilled Water Pump
40 ft pump head
77% impeller efficiency
90% motor efficiency
Variable speed; 30% minimum pump speed
Condenser Water Pump
60 ft pump head
77% impeller efficiency
90% motor efficiency
Heating Plant
Two (2) 105 BHP natural gas fired, hot water boilers (80% nominal efficiency, reduced to 76%
Operating Parameters
Heating plant operates winter and summer (to provide reheat)
Water loop temperature drop 50F
Hot Water Pump
60 ft pump head
77% impeller efficiency
90% motor efficiency
Variable speed; 50% minimum pump speed
Domestic Hot Water Heating Plant
One gas fired domestic hot water boiler (80% efficiency).
Operating Parameters
Daily hot water use 3,931 gallons (weekdays only, no hot water use on weekends or
holidays).
Peak hot water use 1,092 gallons per hour (during one hour each weekday).
Domestic hot water supply temperature 140F.
APPENDIX I - GSA LEED COST STUDY
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