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机房空调的送风方式主要分为两类,即上送风(V型)和下送风(反V型)。通过焓差实验法研究了机房空调中不同角度反V型蒸发器的换热性能。所研究的角度分别为32.5°、39°、45.5°,并且研究了三种角度蒸发器分别在风量百分比为100%、90%、80%、70%时四种情况下的换热性能。对比分析了各种工况下的制冷量、能效比,并且从蒸发温度以及压缩机的吸、排气温度及压力、冷凝温度等方面分析造成这种差异的原因。研究结果表明,当夹角为39°和45.5°时,蒸发温度约高2℃,系统的换热性能较好。与角度32.5°相比,当风量百分比为100%和90%时,最大制冷量均提高2%左右;当风量百分比为80%和70%时,最大制冷量分别提高5.7%和6%,能效比分别提高了3.5%和6.7%。
Air-conditioning room air supply mode is divided into two categories, namely the air supply (V-type) and the next air supply (V-type). The enthalpy difference experiment was used to study the heat transfer performance of anti-V-evaporator at different angles in air-conditioners. The studied angles are 32.5 °, 39 ° and 45.5 °, respectively. The heat transfer performance of the three kinds of angle evaporators under the four conditions of 100%, 90%, 80% and 70% respectively is studied. Comparing the cooling capacity and energy efficiency ratio under various operating conditions, the causes of this difference are analyzed from the evaporation temperature, as well as the suction, exhaust temperature and pressure of the compressor, condensation temperature and so on. The results show that when the angle is 39 ° and 45.5 °, the evaporation temperature is about 2 ℃, and the heat transfer performance of the system is better. When the air volume percentage is 100% and 90%, the maximum cooling capacity is increased by about 2% compared with the angle of 32.5 °. When the air volume percentage is 80% and 70%, the maximum cooling capacity is increased by 5.7% and 6% respectively, and energy efficiency Respectively, increased by 3.5% and 6.7%.