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Guarantee the normal working performance of the condenser
- Jun 26, 2018 -

The condensing pressure of the refrigeration system is the pressure indicated by the high-pressure meter, expressed as absolute pressure. In general, the condensing temperature is 5-7°C higher than the cooling water inlet temperature and 10-15°C higher than the forced air cooling air inlet temperature. When the evaporation temperature is constant, the condensing temperature increases, the condensing pressure also increases, the compression ratio of the compressor increases, the gas transmission coefficient decreases, the compressor cooling capacity decreases, and the power consumption increases. In addition, the condensing pressure increases and the temperature of the compressed exhaust gas increases. If the exhaust gas temperature is too high, the compressor lubricating oil will become thin, affecting the lubrication. When the exhaust gas temperature is close to the lubricating oil, the lubricating oil will be charred and accumulate in the exhaust valve, affecting the sealing performance of the valve. .

The condensing temperature is too high and it is analyzed from the design point of view because the condensing area is too small. At this point, the superheated gas that enters the condenser into the condenser cannot be condensed to liquid at the specified pressure, but only condenses at higher pressures and temperatures. In this case, only increase the condenser area or reduce the number of compressors in the parallel system.

During the operation, there are dirt on the inner surface of the condenser or a small amount of non-condensable gas in the system, which can increase the thermal resistance of the heat transfer and prevent the refrigerant vapor from condensing in time. The usual method of disposal is to drain oil regularly, release air and remove scale according to water quality.

Reducing the condensing temperature is beneficial to the operation of the refrigeration unit; measures that can be taken include: first, reducing the inlet temperature of the condenser cooling water; and second, increasing the amount of cooling water. However, the temperature of the cooling water depends on the atmospheric temperature and the relative humidity, and is affected and limited by the natural conditions; while it is simple and easy to increase the flow of the cooling water, but the flow rate of the cooling water is increased, and the power consumption of the cooling water pump is increased.

Cooling water is an open circulation system. Dust, debris, and other harmful substances in the atmosphere will dissolve in the cooling water, posing a serious hazard to the cooling water system. Therefore, the cooling water system and the condenser pipe must be thoroughly cleaned once a year to ensure the normal working performance of the condenser.