In the refrigeration system, the evaporating temperature and the evaporating pressure are a function of each other.
It is related to several conditions such as the capacity of the compressor. If one of the conditions changes, the evaporation temperature and evaporation pressure of the refrigeration system will change accordingly. In the BZL-3×4 movable cold storage
, the evaporation area has not changed, but its refrigerator capacity has doubled, which makes the evaporation capacity of the movable cold storage evaporator not compatible with the suction capacity of the compressor (the evaporation capacity Vo
Much smaller than the suction capacity of the compressor (Vh), that is, V0
1. The configuration of the evaporation area of the evaporator of the combined cold storage equipment is unreasonable:
The configuration of the evaporation area of the evaporator in the combined cold storage is quite different from the technical requirements of the actual refrigeration process. According to on-the-spot observations on some combined cold storages, the evaporation area of the evaporator is only
There are about 75% that should be configured. We know that for the configuration of the evaporator in the combined cold storage, the calculation of various heat loads should be carried out according to its design temperature requirements, and the evaporation capacity of the evaporator should be determined.
The hair area, and then configure according to the requirements of the refrigeration process. If the evaporator is not properly configured according to the design requirements and the configuration area of the evaporator is blindly reduced, the evaporator of the combined cold storage will be damaged.
The cooling coefficient per unit area drops significantly and the cooling load increases, and the energy efficiency ratio decreases significantly, resulting in a slow drop in the temperature in the movable cold storage, and the working coefficient of the refrigerator tends to go up.
Therefore, when designing and selecting the evaporator of the movable cold storage, the area of the evaporator should be selected according to the best heat transfer temperature difference.
2. The configuration of the refrigeration unit of the combined cold storage equipment is unreasonable:
The refrigerating units configured on the combined cold storage produced by some manufacturers are not calculated according to the total cooling load calculated according to the design of the storage and the thickness of the insulation layer of the active cold storage enclosure structure.
Reasonable allocation, but the method of increasing the number of refrigeration units to meet the requirements of rapid cooling in the warehouse. Take the BZL-3×4 prefabricated cold storage as an example, the storage is 4 meters long, 3 meters wide, and
2.7 meters, the net volume of the warehouse is 28.723 cubic meters, equipped with 2 sets of 2F6.3 series refrigeration units and 2 sets of independent serpentine light tube evaporators, each unit and an independent evaporator form a
Complete refrigeration system for cooling operation. According to the estimation and analysis of the machine load of the cold storage, it can be known that the machine load of the active cold storage is about 140 (W/m3), and the actual total load is
4021.22(W) (3458.25kcal), according to the above data, the mobile cold storage chooses a 2F6.3 series refrigeration unit (standard cooling capacity 4000kcal/h) can also meet the requirements of the mobile cold storage
Cold process requirements (up to -15°C ~ -18°C), therefore, it is redundant to configure one more refrigeration unit on the warehouse, and it will also increase the maintenance cost of the unit.
Post time: Nov-22-2022