Construction of a cooler
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.
An electrically driven compressor sucks in the gaseous working fluid and compresses it. The compression heats up the gas. In the subsequent condenser, the gas is cooled by releasing the heat to the environment. The still pressurized working fluid (gas) liquefies in the course of it and flows to the expansion valve.
The working fluid is supplied to the evaporator via the expansion valve. In case of reduced pressure, the working fluid evaporates again and cools down in the course of it. The evaporator can thereby absorb heat from the environment. The compressor sucks the working fluid that is now gaseous again from the evaporator so that the cycle is complete.
The following diagram illustrates the function:
Cooling technology know-how
Explanations and clarifications of some frequently asked questions and terms used in filter technology.
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.
In this design, the evaporator is designed as a cooling coil.