HVAC

Term	Term Definition	Options	Unit of Measure
Natural Ventilation Metric	Metric used in measuring the rate of natural ventilation	View	None
Natural Ventilation Rate	Average rate of natural ventilation when used. Units depend on ventilation method	View	Unknown
Number Of Discrete Cooling Stages	The number of discrete operating stages, excluding "off."	View	count
Number Of Discrete Fan Speeds	The number of discrete operating speeds for the supply-fan motor, excluding "off." Only used if flow control is "stepped"	View	count
Number of Heating Stages	The number of heating stages, excluding "off."	View	count
Other HVAC Type	Type of space conditioning equipment that is not classified as heating, cooling, or air-distribution. This category includes ventilation, dehumidification, humidification, and air cleaning systems.	View	None
Output Capacity	Output capacity of equipment.	View	MMBtu
Part Load Ratio Below Which Hot Gas Bypass Operates	The part load ratio of a chiller below which hot gas bypass (HGBP) operates.	View	None
Pipe Application	Application of pipe	View	None
Pipe Configuration	Number of pipes for distributing steam, refrigerant, or water to individual zones.	View	None
Pipe Insulation Thickness	Defines how thick insulation on pipes in a heating, cooling, water heating system is.	View	in
Pipe Location	Percentage of pipe length in conditioned space	View	percent
Refrigerant	The type of refrigerant used in the heat pump	View	None
Refrigerant Charge Factor	Used to adjust cooling efficiency for assumed slightly degraded performance if refrigerant charge is not verified through acceptance test procedures	View	percent
Reheat Source	Energy source used to provide reheat energy at a terminal unit.	View	None
Required Ventilation Rate	Minimum ventilation rate required by local code.	View	cfm
Return Duct Percent Conditioned Space	Percentage of return duct surface area, including the air handler, that is located within conditioned space (0-1).	View	percent
Sequencing	Sequencing availability of HVAC system	View	None
Static Pressure	The expected or installed internal static pressure of the system at full supply fan speed including all filters, coils, and accessories.	View	Pa
Supply Duct Percent Conditioned Space	Percentage of supply duct surface area that is located within conditioned space (0-1).	View	percent
Supply Fraction Of Duct Leakage	Fraction of total duct leakage that is on the supply side. Remainder is assumed to be on the return side (0-1).	View	None
System Performance Ratio	Ratio of annual system load to the annual system energy consumption (similar to a whole system COP). A higher value indicates less heating and/or cooling energy use to meet the loads, and therefore represents a more efficient HVAC system. SPR can be used to describe the heating, cooling, and overall HVAC systems.	View	None
Ventilation Rate	Installed flow rate for mechanical ventilation system.	View	cfm
Ventilation Type	Type of ventilation, and use of heat recovery	View	None
Water Side Economizer	Presence of water-side economizer to provide free cooling.	View	None

HVAC

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