1.Whereas refrigerative systems reduce the humidity of air (because some water vapour condenses and is drained away), evaporative coolers increase humidity.
虽然制冷系统会降低空气的湿度(因为凝结作用会带走部分水蒸气)，但是蒸汽冷却器却能够增加空气湿度。
2.Whereas refrigerative systems reduce the humidity of air (because some water vapour condenses and is drained away), evaporative coolers increase humidity.