The central air conditioning system may use heat exchangers in two locations.
* The place is the fluorine-water heat exchanger inside the water system air-conditioning main unit, which plays the role of heat exchange with the secondary refrigerant. There are generally three types of heat exchangers, A. casing heat exchanger; B. shell Tube heat exchanger; C. Plate heat exchanger, A and B are generally used on large units, the advantages are small pressure loss, low water quality requirements, not easy to block, C is generally used on small units, the advantage is small size, efficiency High, but the water quality requirements are also high. If it is a water system host, there must be a heat exchanger. If it is not a plate type, it must be one of other forms.
Another place is that the household central air-conditioning water system uses a small heating boiler to assist heating, and also a heat exchanger in series with the air conditioning main unit behind the circulating water pump on the main pipeline, usually a plate type, this is the air conditioning system water and boiler heating water ( The boiler has two circuits of heating and domestic hot water. For heat exchange, when the boiler is used in winter, the boiler temperature is set, the furnace is boiled, the set temperature is reached, the heating circulation pump starts to work, and the water is output to the heat exchanger cycle. The return water on the main pipeline of the air-conditioning system is heated. If the heat exchanger is cancelled and the heat exchanger is cancelled to save the cost, the heating furnace must be connected in parallel to the main pipe. When it is used in winter, the circulating pump of the main system and the heating cycle of the boiler subsystem. The pump grabs water, causing the boiler heating water flow to be insufficient, and the boiler does not function as a heating; there is another way to cancel the heat exchanger. Add a gate valve or a shut-off valve to the main pipe in parallel with the boiler, and close the valve when heating. Off, then cancel the boiler's circulating water pump, because this time is equivalent to connecting the boiler to the air conditioning piping system, this small furnace The circulating pump will suppress the flow of the circulating pump of the main system and can only be canceled. This situation can only be used for boiler heating assistance without providing domestic hot water. Otherwise, because of the principle of the boiler structure, the air conditioner only needs to be opened, and the total domestic hot water is It is not hot. Therefore, this plate heat exchanger must also be used in the case of boiler-assisted heating.
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