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Thermonics Low Temp. Chillers - Glossary H

Heat Exchanger

A Heat Exchanger is a device used to transfer heat between substances, generally for the purpose of removing heat from a process, space or environment. In Chiller technology, the exchange is generally between two fluids, for the purpose of removing heat from a load or product. This process usually involves receiving a liquid vapor refrigerant mixture from the condensing function of the system, and passing it through an arrangement of coils, plates and/or fins wherein the liquid passes close to, and in the opposite direction from, the heat transfer fluid coming from the load, evaporating the liquid part of the cold refrigerant mixture, which cools the transfer fluid which is then returned to the load. The resulting evaporated refrigerant is then moved to the compressor to be recirculated in the process.

Heat Transfer

Heat Transfer is the process of thermal energy moving from one body to another - There are three types of Heat Transfer: Conduction is the transfer of heat from one particle of matter to another, Convection is the transfer of heat from one part of a particle to another by the mixing of the warmer particles with the cooler; and Radiant is the transfer of heat from one body to another as the result of the bodies emitting and absorbing radiation energy. The Heat Transfer in the Heat Exchanger of a typical Chiller is Conductive Transfer.

Heat Transfer Fluids (HTF)

Heat Transfer fluids exchange Heat with Refrigerants (Primary Fluids) to facilitate the removal of heat from a Process/Load. The heat transfer fluid interfaces, through a variety of means, with the load, to remove heat from the load, which is then removed from the heat transfer fluid by the refrigerant using Heat Exchangers (typically composed of touching and/or interlocking Conductive Coils and Heat Transfer Fins). Commonly used in the Chiller Industry include HFE-7100, Ethylene Glycol/Water, Kryo-60, Syltherm and PAO Oil.


In Chiller Technology, Heaters, of varying types and installation methods, are the means by which, in the chilling process, Temperature is regulated and controlled.


HFE-7100 is a Heat Transfer Fluid (See Heat Transfer Fluid) commonly used in Chiller Technology. HFE-7100 is a Non-flammable, Low toxicity, Zero Ozone Depletion Potential HTF with a Boiling Range of 50 °C - 99 °C.

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