The following sections provide details about the assumptions used during energy analysis for each HVAC system.
2-Pipe Fan Coil System, Chiller 5.96 COP, Boilers 84.5 eff
- Water cooled centrifugal chiller (COP 5.96)
- Open, atmospheric pressure cooling tower with variable speed fan and 5-degree Fahrenheit (2.8 degree Celsius) approach
- Forward curved constant volume fan and premium efficiency motor
- 0.25 inch of water gauge (62.3 pascals) static pressure Constant Volume duct system
- Gas-fired hot water boiler with draft fan >2500 kBtuh, 84.5% combustion efficiency
- Variable volume hot water pump
- Hot water coil
- Variable volume chilled water pump
- Chilled water coil
- Variable volume condenser water pump
- Domestic hot water unit (0.575 Energy Factor)
4-Pipe Fan Coil System, Chiller 5.96 COP, Boilers 84.5 eff
- Water cooled centrifugal chiller (COP 5.96)
- Open, atmospheric pressure cooling tower with variable speed fan and 5-degree Fahrenheit (2.8-degree Celsius) approach
- Forward curved constant volume fan and premium efficiency motor
- 0.25 inch of water gauge (62.3 pascals) static pressure Constant Volume duct system
- Gas-fired hot water boiler with draft fan >2500 kBtuh, 84.5% combustion efficiency
- Variable volume hot water pump
- Hot water coil
- Variable volume chilled water pump
- Chilled water coil
- Variable volume condenser water pump
- Domestic hot water unit (0.575 Energy Factor)
11 EER Packaged VAV, 84.5% boiler heating
- Efficient 11 EER, >20-ton Packaged Variable Air Volume (VAV) Unit, Water Reheat, with Variable Speed Drive (VSD)
- Forward curved fan with VSD and premium efficiency motor
- 3.5 inch of water gauge (871.8 pascals) static pressure VAV duct system
- Integrated differential dry-bulb temperature economizer
- Gas-fired hot water boiler with draft fan >2500 kBtuh, 84.5% AFUE
- Constant volume hot water pump
- Hot water coil
- Hot water reheat boxes
- Domestic hot water unit (0.575 Energy Factor)
12 SEER/0.9 AFUE Split/Packaged Gas, 5-11 Ton
- Efficient 12 SEER, 90% AFUE furnace split system with gas heat
- Forward curved constant volume fan and premium efficiency motor
- 2.0 inch of water gauge (498 pascals) static pressure Constant Volume duct system
- Integrated differential dry-bulb temperature economizer
- Domestic hot water unit (0.575 Energy Factor)
12 SEER/7.7 HSPF Split Packaged Heat Pump
- Efficient 12 SEER/7.7 HSPF (Heating Seasonal Performance Factor) < 11.25-ton split/packaged heat pump system
- Forward curved constant volume fan and premium efficiency motor
- 2.0 inch of water gauge (498 pascals) static pressure Constant Volume duct system
- Integrated differential dry-bulb temperature economizer
- Domestic hot water unit (0.575 Energy Factor)
12 SEER/8.3 HSPF Packaged Terminal Heat Pump (PTHP)
- 12 SEER/8.3 HSPF (Heating Seasonal Performance Factor) packaged terminal heat pump (PTHP)
- Forward curved constant volume fan and premium efficiency motor
- 0.25 inch of water gauge (62.3 pascals) static pressure Constant Volume duct system
- Domestic hot water unit (0.575 Energy Factor)
Central VAV, Electric Resistance Heat, Chiller 5.96 COP
- Water cooled centrifugal chiller (COP 5.96)
- Open, atmospheric pressure cooling tower with variable speed fan and 5-degree Fahrenheit (2.8-degree Celsius) approach
- Forward curved fan with Variable Speed Drive (VSD) and premium efficiency motor
- 3.5 inch of water gauge (871.8 pascals) static pressure Variable Air Volume (VAV) duct system
- Integrated differential dry-bulb temperature economizer
- Resistance reheat boxes
- Variable volume chilled water pump
- Chilled water coil
- Variable volume condenser water pump
- Domestic hot water unit (0.575 Energy Factor)
Central VAV, HW Heat, Chiller 5.96 COP, Boilers 84.5 eff (default)
- Water cooled centrifugal chiller (COP 5.96)
- Open, atmospheric pressure cooling tower with variable speed fan and 5-degree Fahrenheit (2.8-degree Celsius) approach
- Forward curved fan with Variable Speed Drive (VSD) and premium efficiency motor
- 3.5 inch of water gauge (871.8 pascals) static pressure Variable Air Volume (VAV) duct system
- Integrated differential dry-bulb temperature economizer
- Gas-fired hot water boiler with draft fan >2500 kBtuh, 84.5% combustion efficiency
- Variable volume hot water pump
- Hot water coil
- Hot water reheat boxes
- Variable volume chilled water pump
- Chilled water coil
- Variable volume condenser water pump
- Domestic hot water unit (0.575 Energy Factor)
Residential 14 SEER/0.9 AFUE Split/Packaged Gas <5.5 ton
- Efficient 14 SEER/90% AFUE furnace <5.5-ton split/packaged system with gas heat
- Residential constant volume cycling fan
- 2.0 inch of water gauge (498 pascals) static pressure Constant Volume duct system
- Domestic hot water unit (0.575 Energy Factor)
Residential 14 SEER/8.3 HSPF Split/Packaged Heat Pump
- Efficient 14 SEER/8.3 HSPF (Heating Seasonal Performance Factor) <5.5-ton split/packaged heat pump system
- Residential constant volume cycling fan
- 2.0 inch of water gauge (498 pascals) static pressure Constant Volume duct system
- Integrated differential dry-bulb temperature economizer
- Domestic hot water unit (0.575 Energy Factor)
Residential 17 SEER/9.6 HSPF Split HP <5.5 ton
- 17.4 SEER/9.6 HSPF <5.5-ton split/packaged air source heat pump, intermittent fan mode
- Residential constant volume cycling fan
- 2.0 inch of water gauge (498 pascals) static pressure Constant Volume duct system
- Premium efficiency, on-demand tankless domestic hot water heater (0.85 Energy Factor)
Underflow Air Distribution
- Packaged Variable Air Volume (PVAV) system with under floor air distribution
- Forward curved fan with Variable Speed Drive (VSD) and premium efficiency motor
- 3.5 inch of water gauge (871.8 pascals) static pressure VAV duct system
- Gas-fired hot water boiler with draft fan >2500 kBtuh, 84.5% combustion efficiency
- Integrated differential dry-bulb temperature economizer
- Variable volume hot water pump
- Hot water coil
- Hot water reheat boxes
- Improved efficiency domestic hot water heater (85% thermal efficiency)