The air conditioning method based on radiation heat exchange has the characteristics of small vertical temperature gradient, high thermal comfort and energy saving, and has become a hot spot of attention. The Fluent numerical simulation, the experiment in this paper studies the direct expansion multi-line radiant air conditioner under the artificially simulated climate environment in winter heating, summer cooling and dehumidification. The temperature difference of the radiation + fresh air mode at the same time indoors under heating conditions is less than 2.5 °C, and the time to reach the indoor set temperature of 24 °C is about 2–3 h. Under cooling conditions, the temperature difference of the radiation + fresh air mode at the same time in the room is about 0.5–2 °C, and the time to reach the indoor set temperature of 26 °C is about 1–3 h. In the fresh air mode, the indoor temperature difference and response time at the same time are slightly larger than the radiation + fresh air mode. The freezing and dehumidification effect of fresh air is obvious, the moisture content of dehumidifying fresh air is between 6.3 and 10.5 g/kg, and the dehumidification efficiency can reach 50%. Under the same artificial simulated climate environment, the consumption of the three modes is not much different. When the outdoor temperature in heating conditions is higher than 9 °C, the fresh air mode can get better, and the radiation + fresh air mode can achieve better comfort when running indoors under various conditions.

基于辐射换热的空调方式具有垂直温度梯度小、热舒适度高、节能等特点，成为人们关注的热点。Fluent数值模拟，本文实验研究了人工模拟气候环境下的直膨式多线辐射空调冬季采暖、夏季制冷、除湿。采暖条件下室内同时辐射+新风模式的温差小于2.5℃，达到室内设定温度24℃的时间约为2-3h。在制冷条件下，室内同时辐射+新风模式的温差约为0.5-2℃，达到室内设定温度26℃的时间约为1-3h。新风模式下，室内温差和响应时间同时比辐射+新风模式略大。新风冷冻除湿效果明显，除湿新风含水量在6.3～10.5g/kg之间，除湿效率可达50%。在相同的人工模拟气候环境下，三种模式的消耗差别不大。采暖工况下室外温度高于9℃时，新风模式效果更佳，辐射+新风模式在室内各种条件下跑步时都能获得更好的舒适度。新风冷冻除湿效果明显，除湿新风含水量在6.3～10.5g/kg之间，除湿效率可达50%。在相同的人工模拟气候环境下，三种模式的消耗差别不大。采暖工况下室外温度高于9℃时，新风模式效果更佳，辐射+新风模式在室内各种条件下跑步时都能获得更好的舒适度。新风冷冻除湿效果明显，除湿新风含水量在6.3～10.5g/kg之间，除湿效率可达50%。在相同的人工模拟气候环境下，三种模式的消耗差别不大。采暖工况下室外温度高于9℃时，新风模式效果更佳，辐射+新风模式在室内各种条件下跑步时都能获得更好的舒适度。