Experimental study on performances of computer room air conditioners in China

Tests the computer room air conditioners with nominal cooling capacity lower than 70 kW from 17 manufacturers. The test results show that 65% of the units cooling capacity exceeds the rated 70 kW, 53% of the units EER exceeds 3.0, 82% of the units sensible heat ratio is not less than 0.9, 76% of the indoor units noise is not more than the standard requirement noise 74 dB, 83% of the outdoor units noise is not more than the standard requirement noise 66 dB; unit EER is in the range of 2.26 to 3.25, sensible heat ratio is in the range of 0.84 to 0.97, the ratio of cooling capacity and air flow rate is in the range of 2.61 to 4.06 W/(m3/h), the indoor noise is in the range of 72.3 to 79.3 dB, outdoor unit noise is in the range of 57.2 to 70.8 dB. Obtains the better test results of the applicability of unit power supply, alarm and protection functions and four remote functions. Because of the lack of specialized laboratories, many manufacturers can not conduct factory commissioning tests. Recommends the manufacturers to improve the test ability of the computer room air conditioners.