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General principles of design and layout of display cooler refrigeration system (3)
General principles of design and layout of display cooler refrigeration system (3)
1) Advantages and disadvantages of display cooler indirect cooling system Advantages:
(1) meets small temperature differences It is required to ensure the relative humidity in the display cooler and improve product quality.
(2) The heat capacity of the carrier refrigerant is large, and the object to be cooled is easy to maintain stability. The display cooler internal cooler area is about 20% less than that of the direct evaporation type (existing only when the thermal expansion valve is used for liquid supply. This does not exist).
(3) can reduce the refrigerant charge.
(4) In case of system leakage, the food will not be contaminated by refrigerant.
(5) has lower requirements on the installation and valve parts of glycol and other systems than direct refrigeration systems.
Disadvantages:
(1) Increase the cooling of the intermediate medium, so that the evaporation temperature is about 5℃ lower than that of the direct refrigeration system, and the cooling capacity is more than 20% less than that of the direct refrigeration.
(2) The conveying device has become more complicated, and a conveying pump for conveying aqueous solutions such as ethylene glycol has been added.
(3) To obtain different display cooler temperatures, a mixing pump and a three-way electric valve must be added.
(4) Three-way electric valve is easy to get stuck due to icing during use.
(5) One-time investment and daily operating costs are higher than direct refrigeration systems.
2) Advantages and disadvantages of direct cooling system Advantages:
(1) Meet the requirement of small temperature difference and ensure the relative humidity in the display cooler.
(2) Direct liquid supply is to use the pressure difference between the condensing pressure and the evaporation pressure to throttling and depressurize the liquid refrigerant and directly send it to the cooling equipment. This liquid supply method is simple and does not consume other power (such as the use of a fluorine pump system). There is no such thing).
(3) is flexible to use, and the evaporation temperature can be set according to the display cooler temperature required by different products.
(4) Under the same display cooler temperature, the evaporation temperature is 5℃ higher than indirect cooling, and the cooling capacity of the machine is increased by about 20%.
(5) is simple to operate, and operates like a general fluorine refrigeration system.
(6)The temperature difference between the display cooler temperature and the evaporation temperature is more stable than indirect cooling.
(7) One-time investment and daily operating costs are lower than indirect systems.
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