The temperature, humidity and hygiene requirements for electronic products are repetitively high. Therefore, purified air conditioning cabinet and water chiller are often used in production workshop. There are 2 solutions for optoelectronic plants at present: A. H EPA system, which inculdes ventilation system,.mixed fan units and high efficiency filter. B, FFU system contains ventilation system,dry-coil According to different air-conditioning system solutions, the following equipment will be used in the photoelectric workshop: combined air-conditioning box (including direct expansion type), screw chiller, overflow overflow high-temperature chiller, dry-coil, FFU high efficiency filter, evaporative condensing screw chiller, integrated evaporative condensing chiller, high-efficiency centrifugal chiller, etc.