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Air Conditioning Condenser works and selection techniques
Author: Date:2014/11/27 11:04:47 Visits:

 Types of condenser, the basic structure and working principle

A condenser type and characteristics
According to their different condenser cooling medium can be divided into water-cooled, air-cooled, evaporative three categories.
(A) water-cooled condenser
    Water-cooled condenser is water as a coolant temperature away by water condensation heat. Circulating cooling water is generally used, but the system needs a cooling tower or cooling ponds. Water-cooled condenser can be divided according to their structure in the form of a shell and tube condenser and two kinds of condenser bushings, common shell and tube condenser.
A vertical shell and tube condenser condenser vertical main features are:
1 ° due to the cooling flow velocity is high, so the heat transfer coefficient is high, typically K = 600 ~ 700 (kcal / m2 · h · ℃).
2 ° vertical installation, small footprint, and can be installed outdoors.
3 ° and the cooling water flow-through velocity, so do not ask for water quality, water generally can be used as cooling water.
Within 4 ° pipe scale easy to remove, and without stopping the cooling system to work.
5 ° but the vertical condenser cooling water temperature rise generally only 2 ~ 4 ℃, the logarithmic mean temperature difference is generally about 5 ~ 6 ℃, so a large amount of water consumption. And because the device in the air, the tube susceptible to corrosion, leaks than the easily found.
2, horizontal shell and tube condenser
    It has a similar vertical condenser housing structure, the main difference is placed horizontally, and water flow housing multiplexed. Horizontal condensers are widely used not only ammonia refrigeration system can also be used freon refrigeration systems, but its structure is slightly different. Ammonia horizontal condenser cooling sleek seamless steel tubes, and freon cooling condenser horizontal ribs generally use low brass. This is due to the lower heat transfer coefficient freon sake. Notably, some freon refrigeration units generally does not have the accumulator cylinder, using only the bottom of the condenser is provided at least a few rows of tubes, serving as the reservoir with the cylinder. 3, condenser bushing
     Refrigerant vapor from above into the cavity between the inner and outer tube, the outer surface of the inner tube is condensed, the liquid bottom of the outer tube sequentially flow down from the lower end flows into the reservoir in. Cooling water enters from below the condenser, passes through the pipe flows out from the upper portion in each row, and the refrigerant counter-current mode. The advantage of this condenser is simple in structure, easy to manufacture, and because condensation is single pipe, 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 of up to 800kcal / (m2 · h · ℃). The disadvantage is that metal consumed in large quantities, 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 connection elbow. Thus, the condenser has been rarely used in the ammonia refrigeration unit.
     For a small air conditioning unit is still widely used Freon condenser bushing.
(B) air-cooled condenser
     Air-cooled condenser is air as the cooling medium, by air temperature away condensation heat. This condenser is suitable for extremely dry or can not 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.
(C) evaporative condensers
    Evaporative condenser cooling water heat exchangers mainly by evaporation in the air absorbs latent heat of vaporization conducted. By evaporative condenser cooling group, water supply equipment, ventilators, flaps and cabinet and other components. A cooling tube group for seamless steel pipe bent serpentine coil group made, mounted in a rectangular box body made of steel sheet. Sides or top of the box has a fan at the bottom of the box doubles as a cooling water pond.
D) water spray condensers
    The main advantage of tricking condenser: 1, simple structure, easy fabrication; 2, when the leakage of ammonia is easy to find, easy maintenance; 3, easy to clean; 4, low water quality requirements. The main disadvantages are: 1, low heat transfer coefficient; 2, metal consumption is high; 3, large area. Drenching rely condenser water temperature and water evaporating away in the air condensing heat. This condenser mainly for large and medium-sized ammonia refrigeration system. It can open the installation can also be installed at the bottom of the tower, but should avoid direct sunlight.

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