HVAC - Resource Guide For Green Building Design - Trane

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EARTHWISE SYSTEMS DX UNITARY SYSTEMS ROOFTOP, SPLIT, SELF-CONTAINED green options green criteria reference 1 2 3 4 5 6 7 8 Avoid oversizing supply airflow and cooling capacity Avoid using hotgas bypass unless it is absolutely required Select high-efficiency equipment Consider using an air-to-air heat pump equipment (may not be suitable for extreme cold climates) Include an airside economizer (or waterside) Add an air-to-air heat exchanger for exhaust-air energy recovery Use variable air volume (VAV) in a multiple-zone system Directly control space humidity by overcooling and reheating supply air using refrigerant heat recovery • Improves comfort control • Improves dehumidification performance • Reduces overall energy use • Minimizes the risk of refrigerant leaks in a DX split system due to less fieldinstalled refrigerant piping • Reduces overall energy use • Reduces heating energy use during mild outdoor conditions because a heat pump is a more efficient heater than hot water, steam, gas or electric heat • Reduces cooling energy use during mild non-humid outdoor conditions • Permits downsizing of cooling and heating equipment • Reduces cooling and heating energy use • Reduces energy use at part-load conditions • Improves part-load dehumidification performance • Improves comfort and IAQ by allowing direct control of space humidity (below a desired upper limit) • Avoids the use of “new” energy for reheat (17) (18) (21) (49) (19) (17) (21) (49) (17) (22) 6
9 10 green options green criteria reference Provide “powered exhaust” (on/off central exhaust fan) for control of building pressure in a constantvolume system with an airside economizer. Provide modulating central exhaust for direct control of building pressure in a VAV system with an airside economizer. Avoid using DX system for large building with low diversity or high utilization • Maximizes the benefit of the airside economizer, thereby reducing cooling energy use during mild outdoor conditions • Helps minimize risk of moisture-related problems in the occupied spaces or building envelope • Reduces fan energy use by minimizing the operation of the central exhaust fan 2 • Area >430,000ft (40,000 m 2 ), full airconditioned 2 • Area >215,000ft (20,000 m 2 ), cooling only • Example: office, hotel, hospital (23) (24) 7
Page 1 and 2: GREEN BUILDING HVAC Resource Guide
Page 3: PREFACE Trane values guide us in ou
Page 6 and 7: EARTHWISE SYSTEMS CHILLED-WATER SYS
Page 8 and 9: EARTHWISE SYSTEMS AIR-HANDLING SYST
Page 12 and 13: CONTROL STRATEGIES ENERGY MANAGEMEN
Page 14 and 15: EQUIPMENT UNITARY HEAT PUMP EFFICIE
Page 16 and 17: EQUIPMENT ELECTRIC CHILLER EFFICIEN
Page 18 and 19: REFRIGERANTS refrigerant theoretica
Page 20 and 21: HVAC IMPACT on LEED ® LEED FOR NEW
Page 22 and 23: HVAC IMPACT on LEED ® LEED FOR EXI
Page 24 and 25: HVAC IMPACT on LEED ® LEED FOR COR
Page 26 and 27: ENERGY MODELING FEATURES OF TRACE
Page 28 and 29: ASHRAE 90.1-2004 APPENDIX G TABLE G
Page 30 and 31: REFERENCE REFERENCE 1. CoolToolsTM
Page 32 and 33: REFERENCE 43. MacCracken, M. M. 200
Page 34 and 35: NOTES: 30
Page 36: Literature Order Number............

HVAC - Resource Guide For Green Building Design - Trane

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