Why does the central air conditioning system must use plate heat exchanger?

Hofmann：www.hfm-phe.com


First, the fluorine - water heat exchanger in the water system air conditioning host, plays with the secondary refrigerant heat transfer effect. Generally there are three forms of heat exchanger, A. double pipe heat exchanger; B. shell and tube heat exchanger; C plate heat exchanger. A and B are generally used in large units, with small pressure loss, low water quality requirements, not easy to plug, C general used in small units, with small size, high efficiency, But the water quality requirements are also high. The water system host, must have a heat exchanger, if not the plate must also be other type.


Second, the central air-conditioning water system use a small heating boiler to make auxiliary heating, also cascade a heat exchanger, usually the plate in front of the air conditioning host which is behind the circulating water pump in the main channel. It is used for the air conditioning system water and boiler heating water (there are two circuits heating and living hot water in boiler) heated. In winter, after setting the boiler temperature, heating up water, to reach the setting temperature, let the heating cycle pump to work, and make water output to join the heat exchanger cycle, to heat backflow water in the air conditioning system. If in order to save the cost to cancel the heat exchanger, it is necessary to connect the heating furnace in parallel on the main pipe. Using in winter, the main system circulating pump and boiler subsystem heating cycle pump have to grab water, bring about the insufficient the boiler heating water flow, so the boiler cannot get heating. There is another way to cancel the heat exchanger, add a gate valve or valve on the main pipe parallel to the boiler, when heating turn off the valve, and then cancel circulating pump of the boiler, because at this time, doing this is likely to make the boiler connected in series to the air conditioning pipeline system. The small circulation pump in the furnace will suppress flow in the main system of circulating pump, only to be canceled. This situation can only be used for boiler heating without providing hot living water, otherwise due to the principle of boiler structure, as long as open air conditioning, hot living water cannot always be burned. So under the boiler auxiliary heating case, it must use the plate heat exchanger.

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