1.Selection Overview:
In the design of cold storage system, the general ceiling chiller does not need us to design, we only need to master the selection method, according to the selection method can choose the matching chiller, do not need to use Excel or software to design and calculate the parameters of the chiller. Regarding the selection of chiller, due to the different temperature of the library, first of all, we must choose the appropriate pitch of the chiller, the common chiller: Fin spacing is 4mm, 4.5mm, 6~8mm, 10mm, 12mm, 16mm; 8-16mm.
And then there's the front and back pitch. The fin spacing is small, suitable for high temperature environment, the lower the cold storage temperature, the greater the fin spacing required. If the selection is not correct, the fin frost speed is fast, it will soon block the air channel cold storage cooling difficulties, the compressor efficiency can not play out, resulting in an increase in the power consumption of the refrigeration system.
The choice of evaporator sheet distance, we can refer to the principle: In the environment of 0 ° C ~20 ° C, such as workshop air conditioning, cool storage, cold storage, fresh storage, air conditioning storage, maturing storage, etc., choose a chiller with a slice spacing of 4mm or 4.5mm; -16 ° C ~-25C environment, such as low temperature refrigeration, low temperature logistics warehouse, choose a chiller with a slice spacing of 6mm~8mm;
The quick-freezing warehouse of -25 ° C ~-35 ° C generally selects chiller with 10mm and 12mm blade spacing. If the humidity of quick-frozen goods is large, the variable blade spacing chiller will be selected, and the fin spacing on the air inlet side can reach 16mm.
However, there are some occasions, it is not possible to choose the distance between the chiller fins simply according to the temperature, such as the rapid pre-order of meat and vegetables, acid discharge, although the temperature of the cold room is generally set above 0 ° C, because the temperature of the cargo is high, the cooling speed is fast, and the humidity of the goods is large, if the chiller with the spacing of 4mm or 4.5mm is selected, it is not suitable. It is necessary to use a chiller with a blade pitch of 8mm or even 10mm. There are also similar to the storage of garlic, apples and other fruits and vegetables, the appropriate storage temperature is generally -2C, such as storage temperature below 0 ° C fresh-keeping or air conditioning library, also need to choose the blade distance of not less than 8mm cooler.
2. Method of selecting the type of cold air machine:
In the chiller, the most commonly used or D series chiller, he is a supporting freon refrigeration unit used in a variety of cold storage cooling equipment, according to the applicable temperature, can be divided into DL, DD, DJ three series, can be applied to different library temperature:
DL type chiller is mainly suitable for fresh storage at about 0 ° C, the sheet distance is about 4-4.5mm;
DD type chiller is mainly suitable for cold storage at -18 ° C, and the sheet distance is about 6-8mm;
The DJ type chiller is mainly suitable for quick-freezing storage below -25℃, and the sheet distance is about 10-12mm;
3.Selection steps:
01, according to the library temperature to choose the appropriate pitch or series of cooler;
02, according to the correction formula and correction factor, calculate the nominal cooling capacity of the chiller;
03, according to the selection of samples and data, choose the right cold air model number.
Matters needing attention
There is a gap between different brands with different correction coefficients, please calculate according to their selection samples.
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