CMC room-based CRAC (chilled water) is a product further developed on the basis of CMA room-based air conditioner. It usually forms a refrigeration system together with chiller units, water pump, chilled water pipe, etc., which has the characteristics of high refrigeration efficiency and remarkable energy saving. Application scenarioses: data center, telecom equipment and computer room, constant temperature and humidity process environment, constant temperature and humidity storage environment, other precision instruments and equipment environment, such as precision machining, electronic instrument workshop, museum, archives, high-grade wine cellar, medical equipment room, constant temperature and humidity laboratory, etc