6.1 Operation of the Cooling Unit
Fig. 6.1 Cooling Circuit
When a coolant compressor is put into operation, the coolant vapor evaporates from the
evaporator. The heat required for the evaporation of the coolant is drawn from the evaporator
environment (internal circuit of the enclosure), causing it to cool down. The heat fed to the coolant in
the evaporator is its environment (assisted by fans), making the coolant once more liquid due to the
condensation which takes place. In the thermostatically controlled expansion valve, the liquid
coolant is reduced to the particular evaporator pressure required. The cooling which occurs due to
the reduction of pressure, releases the heat from the liquid and throttle vapor is returned to the
evaporator. The cooling cycle is thus completed, the aforementioned process of the heat transfer
starts afresh.
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