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Cooling technology know-how
Explanations and clarifications of some frequently asked questions and terms used in refrigeration technology.
HOFFMANN coolers are designed as compression refrigeration systems. This version which can also be found in refrigerators, for example, has the best efficiency of all common cooling techniques in the room temperature range.
According to DIN EN 378-1, the working medium is a “fluid used for heat transfer in a refrigeration system which absorbs heat at low temperature and …”
With a Continuous-Flow Cooler, the liquid to be cooled can be pumped through the heat exchanger (evaporator).
In this design, the evaporator is designed as a cooling coil.
Free-cooler modules are heat exchangers equiped with a fan which are connected in series with the cooler. Installed outside the manufacturing hall. With respectively low ambient temperatures they release part of the heat being diverted into the ambient air.
If the heat is not to be released into the workshop, the condenser may be installed outside the workshop (e.g., on the roof).
The evaporator of a compression refrigeration system is a heat exchanger which absorbs the heat from the medium to be cooled and transfers it to the working fluid.
The liquefier (or condenser) is a heat exchanger which dissipates the heat generated during the compression of the working fluid by dissipating it e.g. to the ambient air.
A heat exchanger is an apparatus for transferring heat from one medium to another. In compression refrigeration systems, only indirect heat exchangers in which the two media are separated by a solid wall are used.
Water coolers are used to generate cold water which can be used for any cooling task.
The function of a cooling lubricant is to reduce the friction between tool and workpiece in order to generate less heat and thus improve the machining result.