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display cooler air-cooled condenser
author: supermarket refrigerated showcase category: commercial refrigeration Views: 594Time: 2016-08-22
display cooler air-cooled condenser
In an air-cooled condenser, the heat released by the condensation of the display cooler refrigerant is taken away by the air. Air-cooled condensers are mostly used in small Freon refrigeration devices, such as electric display cooler, supermarket refrigerated showcase, window air conditioners, automobiles and railway passenger cars, refrigerated cars and other mobile refrigeration devices, and large display cooler heat pump air conditioning units are also used Have adopted. Air-cooled condensers are generally of coil type. The refrigerant vapor is condensed in the tube and air flows through the tube. According to the different ways of air flow, there are natural convection and forced convection. The
natural convection air-cooled condenser is mainly used in household display coolers and miniature refrigeration devices. The structure of the forced convection air-cooled condenser is to make the structure of the condenser compact. Usually several serpentine tubes are connected in parallel. Cuboid shape. Freon vapor enters several coils from the upper distribution header, and the condensed liquid flows down the coil, converges in the liquid header, and then flows into the reservoir. The air flows through the outside of the tube under the action of the fan, and the outside of the tube is also made of fins, and most of them are of the fin type. The heat transfer coefficient of this kind of condenser is also relatively small. When the front wind speed is 2~3m/s, the heat transfer coefficient calculated based on the entire outer surface (including the fins) is 24~29W/ (m2.K). Due to the high outdoor temperature in summer (up to 350C), when the air-cooled condenser is used, its condensation temperature is also high (up to 40-50°C), so it is more suitable for display cooler refrigerants with lower condensation pressure. The biggest advantage of the air-cooled condenser is that it does not require cooling water, so it is especially suitable for water-scarce areas or places where water supply is difficult.
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