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Evaporative condenser
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Evaporative condenser
Evaporative condenser is a heat exchange device used for cooling cold storage, which is composed of fans, condensing coils, heat exchange fins, boxes and other components.
Evaporative condenser (Evaporative condenser) is also called evaporative cooling and cooling (condenser). It uses the spray water outside the coil to partially evaporate by absorbing the heat of the high-temperature gaseous refrigerant in the coil to gradually change the refrigerant in the tube from gas. A device that is cooled to liquid.
Refrigeration evaporative condenser is composed of special axial flow fan, spray nozzle, electronic water descaler, air bag, PVC heat exchanger, high-efficiency dehydrator, cooling pipe group, filler water collection tank, water pump, water collector, box and other components.
Working principle
The evaporative condenser is the main heat exchange equipment in the refrigeration system. Its principle of action is: the superheated high-pressure refrigerant gas discharged from the compressor in the refrigeration system passes through the condensation pipe in the evaporative condenser to make the high-temperature gaseous refrigerant and the discharge The spray water and air outside the pipe exchange heat. That is, the gaseous refrigerant enters the discharge pipe from the upper port and is gradually condensed into liquid refrigerant from top to bottom. The super wind power of the auxiliary induced draft fan makes the spray water completely and evenly cover the surface of the coil, and the water borrows the wind, which greatly improves the heat exchange effect. The spray water with increased temperature changes from part to gas state, and a large amount of heat is taken away by the wind force by using the latent heat of vaporization of water. The water droplets in the hot gas are intercepted by the high-efficiency dehydrator, and the rest of the water that has absorbed the heat are scattered into the heat exchange layer of the PVC spray sheet, cooled by the flowing air, the temperature decreases, enters the water tank, and then continues to circulate through the circulating water pump. The moisture evaporated into the air is automatically replenished by the water level regulator.
Heat exchange tubes adopt various forms, commonly used are carbon steel hot dip zinc tubes (divided into circular tubes and elliptical tubes), aluminum alloy tubes and stainless steel tubes (divided into 314/316 circular tubes and wave tubes); Among them, carbon steel hot dip zinc evaporative condenser is the earliest product to be used and most of the domestic users are mainly used for high-pressure gas condensation and cooling, with the applicable pressure range of 0-30MPa. Aluminum alloy evaporative condenser is a new energy-saving new generation product suitable for ice machine refrigerant condensation, the applicable pressure range is 0-5MPa; stainless steel tube evaporative condenser is mainly used in some corrosive gas cooling and condensation processes in chemical plants.
The shell of the refrigeration evaporative condenser is generally sprayed with galvanized sheet, which has the characteristics of stainless steel, does not rust, looks good, and is easy to process.
Operating principle
The spray water is transported by the water pump to the spray pipe at the top of the evaporative condenser, and sprayed to the outer surface of the condensation pipe through the nozzle to form a very thin water film. Part of the water in the water film absorbs heat and evaporates into water vapor. The rest falls into the water collecting tank and is recycled by the water supply pump.
The axial flow fan forces air to be sucked from the top and the lower part of the side wall to flow through the coil. The filler and saturated hot and humid air are discharged into the surrounding atmosphere. Part of the water droplets entrained in the hot and humid air are trapped by the water collector, which effectively controls the drifting loss of water droplets. The water vapor in the lost atmosphere is controlled by the float valve to supplement the cooling water in the system.
Equipment Advantages
Low system operating costs
Condensing temperatures within the wet bulb design temperature of 8.3°C are very practical and economical. As a result, the compressor power saves at least 10% power consumption compared to other cooling tower/condenser systems and 30% power consumption compared to air-cooled condenser systems. The power of the fan is equivalent to the power consumed by the fan of the cooling tower/condenser system and is about 1/3 of the power of an air-cooled condenser fan of the same specification. Due to the lower pump head and reduced water flow, the pump power is approximately 25% of the pump power required in a conventional cooling tower/condenser system.
Saving initial investment
The evaporative condenser integrates the cooling tower, condenser, circulating pool, circulating water pump and water pipe into one, thus reducing the cooling tower, circulating water pump and water pipe equipment, and also reducing the cost of handling and installing individual components in the cooling tower/condenser system. Since the evaporative condenser efficiently uses the evaporative cooling heat exchange method, it can effectively reduce the heat exchange area, the number of fans and the power consumption of the fan motor.
Save space
Evaporative condensers save valuable space by integrating the condenser coil with the cooling tower, and do not necessitate the need for large pumps and piping as in cooling tower/condenser systems. Evaporative condensers require only about 50% of the windward area of an air-cooled condenser of the same specification.
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