supermarket refrigerated showcase » article > display freezer > The selection of the expansion valve in the display cooler (4)
The selection of the expansion valve in the display cooler (4)
The selection of the expansion valve in the display cooler (4)
3) The suction head of the ammonia pump. Various forms of ammonia pumps have their own structure according to their own structure. Cavitation allowance. Cavitation allowance is the suction head necessary for the pump to avoid cavitation. It is called net positive suction head (NPSH). NPSH is an important parameter in pump performance, and the data is provided by the manufacturer.
7. Selection of oil collectors Oil collectors are generally selected based on the cooling capacity of the refrigeration system, but the standards are different. Practice has proved that larger specifications are better in actual use. It is generally recommended to choose according to the following standards. When the total cooling capacity of the standard working condition is below 200kW, one 4219 oil collector should be selected: when the total cooling capacity is greater than 200kW, two 4219 oil collectors should be used to separate the high and low pressure containers in the system with oil.
8. The selection of air separator The selection of air separator does not require calculation, and can be selected according to the display cooler scale and usage requirements. Regardless of the number of compressors in each machine room, generally only one air separator is required. The air separator should be a vertical automatic type. If you choose a quadruple tube air separator, when the total cooling capacity is greater than 1100kW, you can choose the KFA-50 type; when the total cooling capacity is less than 1100kW, you can choose the KFA-32 type.
9. Selection of filter drier Filter drier is a combination of drier and filter. The filter screen is usually 80---100 meters of brass or stainless steel to filter the mechanical impurities such as metal shavings and oxide scale in the refrigerant to prevent the valve holes from being blocked by impurities. The desiccant is mostly silica gel, molecular sieve and activated alumina , Used to absorb the moisture in the refrigerant to prevent ice blockage. The filter drier is generally selected according to the specifications of the pipe connected to it, and its nominal diameter or pipe diameter should be compatible with the pipe. When selecting, it should be equipped with enough filter area to prevent excessive resistance loss ' generally based on the filter flow rate, the flow rate of gas through the filter is preferably 1~1.5m/s, and the flow rate of liquid through the filter. The best value is 0.07～0.lm/s.
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