Supermarket refrigerated showcase Refrigerator characteristics when temperature changes
Supermarket refrigerated showcase Refrigerator characteristics when temperature changes
A supermarket refrigerated showcase has been designed, manufactured or selected as a two-stage compression refrigeration unit, and their theoretical gas delivery ratio a is fixed value. When the operating conditions of the refrigerator are the same as the design conditions, the refrigerator has the intermediate pressure pm, cooling capacity b, shaft power Pe, Pd, and performance coefficient COP determined in the design calculation. Etc., but when the working conditions change, the above indicators will also change. In the low-temperature device that requires regulation of the evaporating temperature and during the start-up of the refrigerator, tk and a will not change but to will change. When to increases, because the compressor’s intake air volume ratio decreases and the unit refrigeration capacity b increases, the unit’s refrigeration capacity a increases; as the working temperature range decreases, the coefficient of performance is improved. Conversely, when it drops, both the cooling capacity and the coefficient of performance decrease. The power change can be seen from the analysis of the single-stage compression refrigeration cycle. When Pk/pm≈3, the Pe of the high-pressure stage will reach the maximum value; and the Pd of the low-pressure stage will depend on the relationship between Pm and Po when the evaporation temperature changes. Therefore, the selection of the motor can be considered according to the high and low voltage levels. The high-pressure compressor should be selected according to the maximum power condition. As for the selection of the motor for the low-pressure compressor, the two-stage compressor usually starts the high-pressure stage first, and waits until the evaporation temperature drops to a certain value before starting the low-pressure stage. Therefore, the power of the motor can be based on the power of the motor when it is put into operation. Selection of working conditions. For a single-unit two-stage compressor, the high and low pressure stages start at the same time. If there is an energy unloading device, the motor power selection can be calculated according to the operating conditions. The above articles are from refrigerated showcase commercial refrigeration and supermarket refrigerated showcase. For details, please log in: www.ihdjx.com Free Order Hotline: +86 18019567573 Contact: Mr. Shao 26066250@qq.com
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