What are the advantages of one-stage cooling compared with two-stage cooling?
The second stage of the two-stage cooling is the refrigerant, which exchanges heat with the hot wort that is higher than the local water temperature; while the first stage of cooling is to freeze the local brewing water.
The main advantages of one-stage cooling are:
A. The first stage of cooling uses brewing water as a refrigerant, without the need to use alcohol or ethylene glycol.
Compared with the two-stage cooling, the temperature of the hot water in the B-stage cooling is much higher, and the heat energy utilization rate of the saccharification chamber is greatly improved.
C. During the two-stage cooling operation, water and refrigerant must be used at the same time. The temperature changes greatly during the cooling process and is not easy to stabilize; while in one-stage cooling, only ice water is used as the refrigerant during the cooling process. The parameters of the cold and hot media Unchangeable, stable operation and easy to control.
Because the logarithmic average temperature difference between the cold and hot media in the D-stage cooling is smaller than that of the two-stage cooling, the heat exchange area needs to be increased by 45% compared with the two-stage cooling. However, since there is no peak load in one stage of cooling, the load of the refrigerator is relatively light and the installed capacity is small.
E. Generally, one-stage cooling can save 30%~40% of electricity compared with two-stage cooling.
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