Accumulator: a storage vessel for liquid refrigerant; also known as surge drum.
Bubble point: the temperature at which the vapor pressure of the liquid refrigerant equals the absolute external pressure of the liquid-vapor interface.
Capacity, refrigerating system: the cooling effect produced by the total enthalpy change between the refrigerant entering the evaporator and the refrigerant leaving the evaporator. Chiller, Evaporator: a heat exchanger in which the liquid refrigerant is vaporized by a process stream which is in turn cooled.
Compression ratio: ratio of outlet to inlet absolute pressures for a compressor.
Condenser: a heat exchanger in which the refrigerant, compressed to a suitable pressure, is condensed by rejection of heat to a cooling medium.
Cooling medium: any substance whose temperature is such that it is used, with or without change of state, to lower the temperature of refrigerant either during condensing or subcooling.
Effect, refrigerating: the rate of heat removal by a refrigerant in a refrigeration system. It is equal to the difference in specific enthalpies of the refrigerant at two designated thermodynamic states.
Expansion valve: a valve for controlling the flow of refrigerant to an evaporator or chiller. Flash gas: the gas resulting from the instantaneous evaporation of refrigerant by a pressure reducing device, such as a control valve.
Frost Plug: small diameter closed nozzle protruding from the side of an insulated vessel which indicates liquid level in the vessel by accumulation of frost. Halocarbons: a family of refrigerants consisting of fluorinated and/or chlorinated hydrocarbons. Hot gas bypass: warm discharge gas recycled to chiller for maintaining system’s operating integrity at minimum load conditions.
Liquid refrigerant receiver: a vessel in a refrigeration system designed to ensure the availability of adequate liquid refrigerant for proper functioning of the system and to store the liquid refrigerant when the system is pumped down.
Refrigerant: the fluid used for heat transfer in a refrigeration system, which absorbs heat at a low temperature and low pressure and rejects heat at a higher temperature and a higher pressure.
Ton of refrigeration: amount of heat required to melt 1 ton of ice in 24 hours, equivalent to 12,000 Btu/hr at 32°F.
Capacity, refrigerating system: the cooling effect produced by the total enthalpy change between the refrigerant entering the evaporator and the refrigerant leaving the evaporator. Chiller, Evaporator: a heat exchanger in which the liquid refrigerant is vaporized by a process stream which is in turn cooled.
Compression ratio: ratio of outlet to inlet absolute pressures for a compressor.
Condenser: a heat exchanger in which the refrigerant, compressed to a suitable pressure, is condensed by rejection of heat to a cooling medium.
Cooling medium: any substance whose temperature is such that it is used, with or without change of state, to lower the temperature of refrigerant either during condensing or subcooling.
Effect, refrigerating: the rate of heat removal by a refrigerant in a refrigeration system. It is equal to the difference in specific enthalpies of the refrigerant at two designated thermodynamic states.
Expansion valve: a valve for controlling the flow of refrigerant to an evaporator or chiller. Flash gas: the gas resulting from the instantaneous evaporation of refrigerant by a pressure reducing device, such as a control valve.
Frost Plug: small diameter closed nozzle protruding from the side of an insulated vessel which indicates liquid level in the vessel by accumulation of frost. Halocarbons: a family of refrigerants consisting of fluorinated and/or chlorinated hydrocarbons. Hot gas bypass: warm discharge gas recycled to chiller for maintaining system’s operating integrity at minimum load conditions.
Liquid refrigerant receiver: a vessel in a refrigeration system designed to ensure the availability of adequate liquid refrigerant for proper functioning of the system and to store the liquid refrigerant when the system is pumped down.
Refrigerant: the fluid used for heat transfer in a refrigeration system, which absorbs heat at a low temperature and low pressure and rejects heat at a higher temperature and a higher pressure.
Ton of refrigeration: amount of heat required to melt 1 ton of ice in 24 hours, equivalent to 12,000 Btu/hr at 32°F.