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Introduction of return air system in clean workshop

Dec 1,2020

The fresh air and return air in the air supply system of the clean room air purification project are mixed in the air conditioning unit (AHU) of the air conditioning machine room, and then sent to the top of the clean room through the air supply pipe after a series of filtration and heat and humidity treatments , And then sent to the clean workshop after being filtered by a high efficiency filter on the top. The return air is drawn back to the air-conditioning unit in the air-conditioning machine room through the return air pipe located at the bottom or top of the clean room. The return air is remixed with fresh air in the air-conditioning unit for reciprocating processing. This is the working process of the air supply and return air system of the clean room, which is a common practice in the clean room industry. To From the perspective of operating economy and energy saving, this kind of primary return air supply system is mostly used in relatively low cleanliness level, the number of air changes is small, the total air volume is small, the indoor heat generation is large, and the air temperature difference is large. The clean workshop of the electronics industry, that is, the air-conditioning air supply volume that eliminates waste heat and humidity is similar or the same as the purification air volume, and does not require reheating or a system with less reheating. It is reasonable and feasible. If the air supply volume is large, the indoor heat production is small, and the air supply temperature difference is relatively small, the required reheat is large, and the operation economy is poor. To This form of clean return air is mostly used in the air supply system of industrial clean rooms with lower purification levels of ISO8 and ISO9 and higher indoor heat generation, that is, the air supply of the air conditioner and the purification air supply are the same or similar system.

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