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Selection of expansion valve in commercial refrigeration (3)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 799Time: 2016-08-22
Selection of expansion valve in commercial refrigeration (3)
3. Oil separator selection calculation The oil separator selection calculation is mainly to determine the oil separation The diameter of the filter is to ensure that the flow rate of the refrigerant in the oil separator meets the requirements of oil separation and achieves a good oil separation effect.
4. Selection and calculation of ammonia separator. The ammonia separator is divided into the machine room ammonia separator and the commercial refrigeration room ammonia separator. Its main function is to separate gas and liquid and prevent the compressor from liquid hammer. The ammonia separator is selected based on the barrel diameter.
1) machine room ammonia separator
2) commercial refrigeration room ammonia separator for evaporation systems with large fluctuations in working conditions, the commercial refrigeration selected according to the design conditions generally cannot meet the requirements of the system when the system is working at high evaporation temperatures. It is prone to wet stroke. Therefore, when selecting this type of system, it is recommended to increase the selection of the ammonia separator based on the calculation result. For systems that do not have an ammonia separator in the computer room, when selecting the ammonia separator in the commercial refrigeration room, it is recommended to select and calculate according to the ammonia separator in the computer room.
5. Calculation of the selection and calculation of the drain bucket The drain bucket is used for the commercial refrigeration refrigeration system to temporarily store the liquid refrigerant discharged from the evaporator and the discharge of other equipment. According to the function of the drain bucket, the volume is selected so that it can accommodate the discharge volume of the evaporator with the largest discharge volume in each cold room. 6. Selection and calculation of ammonia pump The selection of ammonia pump should be considered from three aspects: flow, lift and suction head.
1) Flow rate
2) Head (discharge pressure) The discharge pressure of the ammonia pump must overcome the path and local resistance loss from the pump outlet to the evaporator liquid inlet, the static pressure resistance loss from the pump center to the highest evaporator liquid inlet, and acceleration resistance Loss etc. Sufficient pressure should be maintained in front of the evaporator expansion valve to overcome the resistance loss of the evaporator and the return pipe, and there is a certain margin for the excess ammonia to flow back to the low-pressure circulation barrel smoothly. When evaporators of different pressures are connected in a system, the discharge pressure should be calculated according to the evaporator with higher evaporation pressure.
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