Volume flows in the glycol/ice water heat exchanger
In 2-circuit refrigerant systems it is known that at full load the volume flow of the generator circuit should rather be larger, but in no case smaller than that of the consumer circuit. Otherwise, the stratified storage tank would continue to discharge despite the refrigeration unit’s full cooling capacity, and warm return flow from the storage tank would mix with the cold flow of the refrigeration unit, thus raising the flow temperature. It is less known that the same has to be taken into account when designing and controlling a heat exchanger connected between the generation and consumption circuit. To keep temperature losses as small as possible, the heat exchanger is usually designed for a temperature difference between glycol/ice water of 1K at both the inlet and outlet. This means that the ratio of the volume flows of glycol and water is then also optimal.
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