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Supermarket refrigerated showcase two-stage compressed ammonia refrigerator
author: supermarket refrigerated showcase category: walk-in display coolers Views: 573Time: 2016-08-22
supermarket refrigerated showcase two-stage compressed ammonia refrigerator
In the supermarket refrigerated showcase refrigeration device, it also includes some auxiliary equipment and control valves necessary to complete the work cycle. The gas discharged from the high-pressure compressor passes through an ammonia oil separator before entering the condenser to separate the entrained oil droplets, so as not to enter the condenser and evaporator and affect heat transfer. A one-way valve is installed on the outlet pipe of the oil separator. Its function is to prevent high-pressure steam from flowing back into the compressor once the machine stops suddenly. The ammonia liquid condensed by the condenser flows into the accumulator, and its function is to ensure that sufficient liquid ammonia is supplied according to the heat load of the evaporator and to reduce the number of times of replenishing liquid ammonia into the system. The intercooler uses a float regulating valve to supply liquid to automatically control the liquid level in the intercooler. The ammonia liquid used for refrigeration is distributed to the evaporators in each warehouse through the regulating station, and throttle valves are generally installed on the pipelines of the regulating station. The function of the gas-liquid separator is to separate the liquid droplets entrained in the low-pressure vapor from the evaporator on the one hand to prevent the ammonia from entering the compressor to form wet compression, and on the other hand to adjust the vapor at the outlet of the station Without entering the evaporator, the area of the evaporator can be used more reasonably. A gas-liquid separator can be connected to several evaporators, so that it also plays a role in distributing liquid and collecting vapor.
a two-stage compression cycle with one-stage throttling and incomplete cooling in the middle
a system schematic diagram of a two-stage compression cycle with one-stage throttling and incomplete cooling in the middle and the corresponding P-h diagram. The main difference between its working process and the first-stage throttling intermediate complete cooling cycle is that the exhaust gas of the low-pressure compressor does not enter the intercooler, but is mixed with the saturated vapor generated in the intercooler in the pipeline and enters the high-pressure compressor . Therefore, the high-pressure compressor sucks in superheated vapor at intermediate pressure. The thermal calculation of the first-stage throttling intermediate incomplete cooling cycle is basically the same as that of the first-stage throttling intermediate cooling complete cooling cycle. The difference is only due to the difference in the method of intermediate cooling, which causes the calculation of the high-pressure stage flow rate to be different. At the same time, the high-pressure compressor sucks in superheated steam, and its state parameters must be calculated. The refrigerant flow rate of the high-pressure compressor can still be obtained from the heat balance relationship of the intercooler.
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