Term
| Automatic Expansion Valve (AEV) |
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Definition
| Metering device that maintains a constant evaporator pressure |
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Term
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Definition
| For blended refrigerants, the temperature used to calculate condenser subcooling |
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Definition
| Pressure that facilitates the opening of the thermostatic expansion valve |
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Definition
| A fixed bore metering device |
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Term
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Definition
| The portion of the compression process in which the refrigerant is compressed |
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Term
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Definition
| The component of an air conditioning system that pumps refrigerant through the system by increasing the pressure of the vapor refrigerant |
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Term
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Definition
| A heat transfer surface in an air conditioning system that rejects heat |
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Term
| Condenser Saturation Temperature |
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Definition
| The temperature at which system refrigerant will condense in the condenser; this temperature corresponds to the high side pressure in the system on a pressure/temperature chart |
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Term
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Definition
| The medium, usually air or water that absorbs the heat that is rejected by the system condenser |
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Term
| Critically Charged System |
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Definition
| A system that requires an exact quantity of refrigerant; all of the refrigerant is moving through the system at all times |
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Term
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Definition
| The component part of a reciprocating compressor that houses the piston |
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Term
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Definition
| The process of removing humidity from the air |
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Term
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Definition
| The process by which the discharge refrigerant from the compressor is cooled down to the condenser saturation temperature |
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Term
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Definition
| The temperature at which air reaches 100% humidity; for blended refrigerants, the temperature used to calculate evaporator superheat |
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Term
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Definition
| The portion of the compression process when the refrigerant is discharged from the compressor |
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Term
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Definition
| The refrigerant line that carries the discharge refrigerant from the compressor to the condenser |
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Term
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Definition
| The pressure of the refrigerant in the high-pressure side of the air conditioning system; also referred to as the high-side or head pressure |
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Term
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Definition
| An evaporator that is designed to have all of the refrigerant boil off into a vapor before leaving the coil |
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Term
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Definition
| The component part of an air conditioning system that is responsible for absorbing heat from the space to be cooled |
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Term
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Definition
| The pressure that corresponds to the temperature at which refrigerant vaporizes in the evaporator on a pressure/ temperature chart |
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Term
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Definition
| A thermostatic expansion valve that measures the evaporator pressure at the outlet of the coil |
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Term
| Fixed-Bore Metering Device |
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Definition
| A metering device that does not open or close in response to changes in the load on the system; examples of the fixed bore metering device are the capillary tube and the piston |
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Term
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Definition
| The process by which some of the liquid refrigerant instantly vaporizes upon entering the evaporator |
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Term
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Definition
| A thermostatic expansion valve that measures the evaporator pressure at the inlet of the coil |
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Term
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Definition
| The refrigerant carrying line that connects the condenser to the metering device |
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Term
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Definition
| The component of an air conditioning system that controls the flow of refrigerant to the evaporator |
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Term
| Outside Ambient Temperature |
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Definition
| The temperature of the air that surrounds the outdoor coil of an air conditioning system |
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Term
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Definition
| The component part of the reciprocating compressor that moves back and forth within the cylinder to compress or expand the refrigerant in the cylinder |
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Term
| Pressure/Temperature Chart |
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Definition
| Shows the relationship that exists between the temperatures and pressures of saturated refrigerants |
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Term
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Definition
| Pounds per square inch gauge; pressure readings taken from gauge manifold |
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Term
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Definition
| In a reciprocating compressor, the process by which the refrigerant trapped in the cylinder at the end or a cycle in expanded to reduce the pressure in the cylinder |
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Term
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Definition
| A process than can repeat itself indefinitely without depleting resources |
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Term
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Definition
| Air that is brought from the conditioned space to the evaporator |
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Term
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Definition
| Refrigerant that is a mixture of liquid and vapor; saturated refrigerants follow a pressure/temperature relationship |
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Term
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Definition
| One of the closing pressures on the thermostatic expansion valve; also the opening pressure on the automatic expansion valve |
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Term
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Definition
| The process by which the refrigerant in the condenser is cooled below the condenser saturation temperature |
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Term
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Definition
| In a reciprocating compressor; the process by which refrigerant in the suction line is pulled into the compression chamber prior to being compressed |
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Term
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Definition
| The refrigerant carrying line that connects the outlet of the evaporator to the compressor |
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Term
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Definition
| The pressure of the low side of the system; also called low-side or back pressure |
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Term
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Definition
| The component part of a reciprocating compressor that opens to pull refrigerant from the evaporator into the compressor for compression |
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Term
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Definition
| The process by which vapor refrigerant is heated above its evaporator saturation temperature |
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Term
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Definition
| The air that is returned to the conditioned space after it has passed through the evaporator |
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Term
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Definition
| TEV component that senses the temperature at the outlet of the evaporator and converts this temperature the valve’s opening pressure |
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Term
| Thermostatic Expansion Valve (TEV) |
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Definition
| Metering device designed to maintain a constant evaporator superheat |
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Term
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Definition
| The amount of refrigerant a system contains |
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Term
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Definition
| The small diameter tube that connects the thermal bulb to the body of a thermostatic expansion valve |
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Term
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Definition
| The component part of a reciprocating compressor that opens to discharge refrigerant from the compreesor into the discharge line |
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