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The types and characteristics of condenser

by:DIGUANG     2020-03-30
Condenser according to its different cooling medium, can be divided into water cooled and air cooled, evaporative three categories. ( A) Water cooled condenser water cooled condenser using water as cooling medium, by the rise of temperature of the water away condensation heat. In circulating cooling water usually use, but the system is equipped with cooling towers or cool pool. Water cooled condenser according to its structure and can be divided into the shell and tube condenser and casing condenser two kinds, common is shell and tube condenser. 1, vertical shell and tube condenser of vertical condenser's main features are: 1 & deg; High flow velocity, because of the large flow rate of cooling, heat transfer coefficient is higher, general K = (600 ~ 700 千卡/平方米· h· ℃) 。 2° Vertical installation cover an area of an area small, and can be installed in outdoor. 3° A large cooling water through flow and flow velocity, so to water quality requirement is not high, average water can be used as cooling water. 4° Pipe scale easy removal, and don't have to stop the refrigeration system work. 5° But in vertical condenser cooling water temperature rise is only 2 ~ 4 ℃, logarithmic mean temperature difference in 5 ~ 6 ℃ or so commonly, so the water consumption is bigger. And the equipment to put in the air, the pipe is easy to corrode, leak than easy to be found. 2, horizontal shell and tube condenser, it has similar with vertical condenser shell structure, the main difference is that the level of the shell multichannel flow and water was laid. Horizontal condenser is not only widely used in ammonia refrigeration systems, can also be used for freon refrigeration system, but its structure is slightly different. Ammonia horizontal condenser cooling pipe using smooth and seamless steel tube, and freon horizontal condenser cooling pipe generally with low rib of brass. This is because of freon exothermic coefficient is low. It is important to note that some freon refrigerating unit is generally not a liquid cylinder, and only in the bottom of the condenser set a few big pipe, and make a liquid container. 3, casing of condenser refrigerant vapor into the cavity between the inner and outer tube, down from above, on tube surface condensation, liquid at the bottom of the outer tube, in turn, obscene, from the bottom into the receiver. Cooling water enters from the bottom of the condenser, in turn, after each row tube flow from the upper, and countercurrent mode to the refrigerant. The advantage of this kind of condenser is simple structure, easy to manufacture, and because of single pipe condensing, medium flow in the opposite direction, so the heat transfer effect is good, when the water velocity is 1 ~ 2 m/s heat transfer coefficient of up to 800 kcal/( m2· h· ℃) 。 The downside is metal consumption is large, and when the longitudinal pipe number is large, the lower the tube filled with liquid, can not make full use of the heat transfer area. Another poor compactness, cleaning is difficult, and a large number of connections elbow. Therefore, this kind of condenser has been rarely used in ammonia refrigeration device. Air cooling condenser air cooling condenser is with air as cooling medium, by the rise of temperature of the air take condensation heat. The condenser is applicable to, extreme lack of water or water supply in small freon refrigerating unit. According to the air flow in a different way, can be divided into natural convection and forced convection type two kinds. ( 2) Evaporative condenser cooling water evaporative condenser heat transfer is mainly by absorption gasification and latent heat of evaporation in the air. By way of air flow can be divided into suction and pressure type, as shown. Evaporative condenser is set by the cooling tube, water supply equipment, fan, water retaining plate and box body parts. Cooling pipe group is made of seamless steel tube bending coiled coil set, in a rectangular enclosure made of thin steel plate. Both sides of the box body or at the top of the fan, the bottom of the box body and a cooling water circulation tank. Evaporative and parallel connection of shell and tube condenser: ( 3) Air cooling condenser air cooling condenser is with air as cooling medium, by the rise of temperature of the air take condensation heat. The condenser is applicable to, extreme lack of water or water supply in small freon refrigerating unit. According to the air flow in a different way, can be divided into natural convection and forced convection type two kinds.
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