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Definition
| Heat pumps that use air as the source of heat while operating in the heating mode |
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Definition
| Air-source heat pumps used to treat air |
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Definition
| Air-source heat pumps used to treat liquid |
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Definition
| Underground water formation |
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Definition
| Device that permits fluid flow in only one direction; a floating ball in the valve body prevents fluid from flowing in the wrong direction |
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Term
| Bidirectional Liquid-Line Filter Drier |
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Definition
| Filter drier used for heat pump applications that permits refrigerant flow through the device in both directions |
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Term
| Bidirectional Thermostatic Expansion Valves |
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Definition
| TEVs equipped with internal check valves to permit almost unrestricted flow through the valve in the opposite direction when the metering device is not needed in the reverse cycle |
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Term
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Definition
| System piping component that allows fluid flow in only one direction |
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Term
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Definition
| Geothermal heat pump configuration that uses buried coils of piping to transfer heat to and from the Earth |
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Term
| Coefficient of Performance (COP) |
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Definition
| Is a measure of the amount of energy output per unit of energy input |
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Term
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Definition
| Materials below the surface of the Earth |
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Term
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Definition
| Heat pump mode of operation that facilitates the removal of ice from the surface of the outdoor coil by changing the system over to the cooling cycle for a period of time |
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Term
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Definition
| Defrost cycle that is initiated only when needed |
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Term
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Definition
| Device that permits fluid flow in only one direction. A pivoting disc within the shell of the valve prevents flow in the wrong direction |
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Term
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Definition
| A gravel, sand, and rock-filled hole in the ground that accepts discharge water from the heat exchanger of a heat pump system |
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Term
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Definition
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Term
| Energy Efficiency Ratio (EER) |
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Definition
| Rates the efficiency of a system; calculated by dividing the BTU output of the system by the power input in Watts |
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Term
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Definition
| Device in the heat pump system that reverses the direction of refrigerant flow through the evaporator and condenser coils to allow the system to operate in either the heating or cooling mode |
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Term
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Definition
| Heat pump system that uses the Earth as the heat source in the cooler months and the heat sink in the warmer summer months |
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Term
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Definition
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Term
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Definition
| Buried piping circuits used in closed-loop geothermal heat pump systems |
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Term
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Definition
| Any substance or media that absorbs heat from another substance or media |
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Term
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Definition
| Any substance or media that supplies heat to a system |
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Term
| Heating Seasonal Performance Factor (HSPF) |
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Definition
| A measure of heating efficiency |
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Term
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Definition
| A single water loop configuration in which the ground loop is located close to the ground surface; used primarily in areas with underground rock formations that make deep trenching very costly |
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Term
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Definition
| Rotating portion of a centrifugal pump that creates the pressure differential needed to facilitate fluid flow |
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Term
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Definition
| Heat transfer surface in a heat pump system that absorbs heat from the occupied space in the cooling mode and rejects heat to the occupied space in the heating mode |
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Term
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Definition
| Heat pumps that use liquid as the source of heat while operating in the heating mode |
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Term
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Definition
| Liquid source heat pumps that are used to treat air |
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Term
| Liquid-to-Liquid Heat Pumps |
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Definition
| Liquid source heat pumps that are used to treat liquid |
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Term
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Definition
| Geothermal systems that obtain their supply water from an open source such as a lake, pond, well, or other underground water source |
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Term
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Definition
| Heat transfer surface in a heat pump that acts as the condenser in the cooling mode and as the evaporator in the heating mode |
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Term
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Definition
| In geothermal heat pump systems, the ground loop configuration that provides multiple paths for the heat exchange fluid to flow in |
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Term
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Definition
| Self-sealing access fitting used to take temperature and pressure readings in geothermal heat pump systems |
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Term
| Pilot-Operated Reversing Valves |
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Definition
| Reversing valves that use system pressures to move the slide back and forth to change the system over between the heating and and cooling modes of operation |
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Term
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Definition
| Electric switch that opens and closes its contacts depending on the pressure it senses |
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Term
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Definition
| Pressurized tanks that store water at all times |
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Term
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Definition
| In geothermal systems, the water that returns to the ground after passing through the system and the return well |
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Term
| Seasonal Energy Efficiency Ratio (SEER) |
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Definition
| Equipment efficiency rating determined by dividing the system’s BTU output by the input power in Watts, taking into account the energy used on system startup and shutdown |
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Term
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Definition
| Pressure inside a vessel when the vessel is at rest; for example, the refrigerant pressure inside an air conditioning system when the system is off |
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Term
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Definition
| A refrigeration component located in the suction line that facilitates the vaporization of liquid refrigerant before entering the compressor |
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Term
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Definition
| In geothermal systems, the water being supplied to the system via the supply well |
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Term
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Definition
| A control device that can be mechanical or electronic; that opens or closes; sets of electrical contacts at predetermined time intervals |
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Term
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Definition
| Used in geothermal heat pump systems, the ground loops are buried vertically in areas where ground space is limited |
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Term
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Definition
| System that uses water as either a heat source or sink one time before the water is “wasted” down the drain |
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Term
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Definition
| The sound generated when flowing water is suddenly stopped by a closing valve |
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Term
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Definition
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Term
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Definition
| Source of underground water used for geothermal heat pump systems; wells must be drilled to the water table, which can be 200 feet below the ground surface |
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