The difference between one-stage cooling and two-stage cooling in wort cooling method
There are one-stage cooling method and two-stage cooling method for wort cooling. Usually, the two-stage cooling method is the most common. If energy saving and control aspects are considered, one-stage cooling method is increasingly used.
For breweries with a capacity of more than 2000L, we will recommend a one-stage cooling method, and breweries with a capacity of less than 2000L will recommend a two-stage cooling method. Of course, we also have to meet the specific needs of customers.
Two stages of cooling
The two-stage plate heat exchanger is divided into two sections for heat exchange. The front section uses cold water for cooling. The cooling water temperature is below 20°C. The temperature of the wort flowing out of the gyratory settling tank is 90°C~95°C. The temperature of the cooled wort drops to 40 ℃~50℃. Refrigerant (such as ethylene glycol or alcohol solution) is used for the latter stage of cooling. The temperature of the refrigerant for the latter stage of cooling is -3℃~-4℃. The temperature of the cooled wort needs to be lowered to the fermentation temperature, such as the fermentation of lager beer. The temperature is 6-10℃, and the fermentation temperature of ale is 16-18℃.
One stages of cooling
In the first stage of cooling, the brewing water is cooled to 3℃~4℃ using the ammonia direct cooling method, and then it is exchanged with the hot wort in a one-time heat exchanger in the plate heat exchanger. While the wort is cooled to the fermentation temperature, the ice water is Heated to about 75℃~80℃, this water can be used directly as washing water.
The difference between the two
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.
The above is about the methods of wort cooling. If you want to know more, please contact Tiantai.
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