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display cooler two-stage compression refrigeration cycle
display cooler two-stage compression refrigeration cycle
display cooler two-stage compression refrigeration cycle, the refrigerant compression process is carried out in two stages. The low-pressure refrigerant vapor from the evaporator (pressure Po) first enters the low-pressure compressor, where it is compressed to the intermediate pressure Pm, and then enters the high-pressure compressor after intermediate cooling, where it is compressed to the condensation pressure pk and discharged into the condenser . In this way, the pressure ratio of each level can be moderate, and the power consumption of the compressor can be reduced due to the intermediate cooling, and the reliability and economy are improved.
The two-stage compression refrigeration cycle can be divided into an intermediate complete cooling cycle and an intermediate incomplete cooling cycle according to the intermediate cooling method; according to the throttling method, it can be divided into a one-stage throttling cycle and a two-stage throttling cycle. The so-called intermediate complete cooling refers to the cooling of the low-pressure stage exhaust gas to saturated steam at an intermediate pressure. If the low-pressure stage exhaust has been cooled, but is not cooled to a saturated vapor state, it is called intermediate incomplete cooling. If the high-pressure liquid is first throttled from the condensing pressure pk to the intermediate pressure Pm, and then throttled down to the evaporation pressure Po by pm, it is called a two-stage throttling cycle. If the display cooler refrigerant liquid is directly throttled from the condensing pressure pk to the evaporating pressure Po, it is called a primary throttling cycle. Although the economy of one-stage throttling cycle is slightly worse than that of two-stage throttling, it can realize long-distance liquid supply or high-level liquid supply by using its own pressure before throttling, so it is widely used.
two commonly used and representative two-stage compression refrigeration cycles
a two-stage compression cycle with one-stage throttling and complete cooling in the middle. The low-pressure vapor with the pressure Po generated in the evaporator E is first sucked by the low-pressure compressor A and compressed to the intermediate pressure Pm, enters the intercooler F, where it is cooled by the evaporation of the liquid refrigerant to saturation corresponding to the intermediate pressure The temperature tm enters the high-pressure compressor B to be further compressed to the condensation pressure pk, and then enters the display cooler condenser C to be condensed into liquid.
The liquid coming out of the condenser is divided into two ways:
flows through the inner coil of the intercooler, and is cooled (subcooled) by the evaporation of the liquid outside the coil, and then throttled to evaporation by the expansion valve H The pressure po is evaporated in the evaporator E to produce cold capacity; the other way is throttled to the intermediate pressure Pm by the expansion valve G, and then enters the intercooler. The throttled liquid evaporates in the intercooler F to cool the low pressureCompressor exhaust and high-pressure liquid in the coil, part of the vapor generated after throttling and vapor generated by liquid evaporation enters the high-pressure compressor B together with the exhaust of the low-pressure compressor, and is compressed to the condensation pressure and discharged into the condensation器C. The cycle continues in this way. This part of the high-pressure liquid entering the display cooler evaporator is further cooled in the coil before throttling, which can reduce the amount of ineffective vapor (ie dryness) generated during the throttling process, thereby increasing the unit cooling capacity. It can be seen from the working process of the cycle that compared with the single-stage compression refrigeration cycle, it not only adds a compressor, but also adds an intercooler and a throttle valve, and the high-pressure refrigerant flow is due to The flow rate of the refrigerant generated in the intercooler is greater than that of the low-pressure display cooler.
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