air-cooled, evaporative three categories.
(A) water-cooled condenser
Water-cooled condenser is water as a cooling medium, taken away by the water temperature condensation heat. Cooling water is generally recycled, but the system needs a cooling tower or cool pool. Water-cooled condenser can be divided according to their structure and casing shell and tube condensers two kinds of condensers,
Common is the shell and tube condensers.
1, vertical shell and tube condenser vertical condenser main features are:
1 ° Because of the high flow rate of the cooling flow, so the heat transfer coefficient is higher, the general K = 600 ~ 700 (kcal/m2 • h • ℃).
2 ° vertical installation, small footprint, and can be installed outdoors.
3 ° cooling water flows straight through and velocity, so do not ask for water, generally water can be used as cooling water.
Within 4 ° pipe scale easy to remove, and without stopping the cooling system to work.
5 ° but vertical condenser cooling water temperature rose to only 2 ~ 4 ℃, the logarithmic mean temperature difference is generally around 5 ~ 6 ℃, so the large amount of water. And because the device in the air, the tube susceptible to corrosion, easily found when leakage ratio.
2, horizontal shell and tube condenser
It has a vertical condenser with a similar structure of the housing, and the main difference is that the level of water put multiple flow housing. Horizontal condenser not only widely used in ammonia refrigeration systems can also be used freon refrigeration system, but its structure is slightly different. Ammonia condenser cooling with smooth horizontal seamless horizontal and freon condenser cooling ribs generally use low brass. This is due to the low heat transfer coefficient for the sake of freon. Notably, some freon refrigeration unit is generally no liquid tanks, using only a small bottom of the condenser tubes located a few rows, liquid tanks with doubles.
3, condenser tube
The refrigerant vapor from the top into the cavity between the inner and outer tubes, the outer surface of the inner tube condensed liquid at the bottom of the outer tube downstream order, flows into the reservoir from the lower end. Condenser cooling water enters from the bottom, passes through the outflow pipe from the upper portion of the rows, the refrigerant counterflow mode. The advantage of this condenser is simple in structure, easy to manufacture, and because the Department of single-tube condensation, medium flow in the opposite direction, so the heat transfer effect, when the water flow rate of 1 ~ 2m / s when the heat transfer coefficient up to 800kcal / (m2 • h • ℃). The disadvantage is the large consumption of the metal, and when the number of large longitudinal tube, the lower part of the tube is filled with more liquid, the heat transfer area can not be fully utilized. Another compact poor, difficult to clean and require a lot of elbow connection. Thus, the condenser has been rarely used in ammonia refrigeration device.
Air-cooled condenser
Air-cooled condenser is air as the cooling medium, the air temperature by the heat of condensation away. This condenser suitable for extremely dry or unable to supply the occasion, common in small freon refrigeration unit. Depending on the way the air flow can be divided into natural convection and forced convection two.
(B) the evaporative condenser and evaporator heat exchanger condenser cooling water mainly in the air by evaporation latent heat of vaporization and absorption performed. Press the air flow can be divided into suction and pressure feed type, as shown in FIG. Evaporative condenser by the cooling group, water supply equipment, ventilators, retaining plate and cabinet and other components. Seamless steel serpentine cooling coil group was made group bent, mounted on a rectangular cabinets made of sheet steel. The sides or top of the cabinet with a fan at the bottom of the box doubles as a cooling water tank. Evaporative condensers with shell and tube shunt:
(C) air-cooled condenser is air-cooled condenser air as the cooling medium, the air temperature by the heat of condensation away. This condenser suitable for extremely dry or unable to supply the occasion, common in small freon refrigeration unit. Depending on the way the air flow can be divided into natural convection and forced convection two.
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