The cooling capacity is measured under the conditions of inlet air dry bulb temperature 27 ° C, humidity temperature 19.50, inlet water temperature 7C and outlet water temperature 12C. The heat supply is measured under the condition of air inlet dry bulb temperature 21 ℃, water inlet temperature 60 ℃ and the same water flow as the cooling condition. Rated air volume is measured under standard air condition and coil dry condition (dry bulb temperature 20 ℃).