Cooling Performance Test and Analysis of a Radiant-convective Air Conditioning Terminal Device with Parallel Pipes

In the paper, an air-conditioning terminal device with parallel pipes was brought out and studied. A test rig was set up to measure the cooling performances of the device in various working conditions. Then the radiation heat transfer percentage of the device was calculated. And the comparison between the device and the radiant cooling ceiling, whose heat transfer also relies on radiation and natural convection, was conducted in respect of cooling capacity. The results showed that the proportion of the radiation heat exchange rate to the total heat exchange rate was around one third, and the cooling capacities per square meter of the device surface can reach as high as 143.8W/m2 when the inlet cooling media temperature was 8̊C and the flow rate kept as 240L/h. The total cooling capacity under this working condition of the device is 631.0W. And the cooling capacity per square meter of the device surface increases by 30% over the value of the radiant cooling ceilings at the same inlet cooling media temperature.