Research On The Influence Mechanism Of Asymmetry Radiation On The Plane Radiation Air-conditioning

Plane radiation air-conditioning is a healthy, comfortable, energy-saving air-conditioning and represents a development direction of future air-conditioning technology. Radiation air-conditioning systems find wide application in recent years due to a series of unique advantages of energy-saving, high comfort and so on. The new systems carry out the target of utilization of low exergy energy in the new air condition systems, but the mechanism of radiant heat transfer needs further research.Radiation air conditioning environment. Body heat transfer by radiation accounts for more than50%of the total exchange heat. Due to radiation high heat transfer, radiation device not uniformly arranged in each wall, the surface radiation temperature in the room is quite different, so the indoor intensity asymmetric radiation field exists, causing different parts of the human body radiation heat transfer amount. When asymmetric radiation exceeds a certain limit, will produce "radiation hair feeling", particularly when the human body from the irradiation surface closer, so that not only interested in the human thermal comfort impact, but also very detrimental to human health. Therefore, it is necessary to study the underlying mechanism of the planar radiating conditioned room asymmetric radiation, theoretically guide the design of the planar radiating conditioned, to minimize the asymmetrical effects of radiation.Through the analysis of asymmetric radiation phenomena, studies the relationships between radiating surface and asymmetric radiation, summer indoor design temperature and asymmetric radiation, sinter indoor heat load and asymmetrie radiation, reveals the inner mechanism of the asymmetry radiation, lay the theoretical foundation for the energy-efficient design and optimal operation of air-conditioning system, which is important for reducing the energy consumption of air conditioning systems, improve indoor thermal comfort, the path of low-carbon economy.First, the heat transfer mechanism of radiation air conditioning and radiation air-conditioned room asymmetric radiant heat environment. Radiation air conditioning technology is not heating/cooling air, just to raise/lower wall temperature, radiation intensity, good thermal comfort. Radiation means can not be uniformly laid in the wall surfaces, therefore, the radiation within the air-conditioned room, each of the surface temperature difference is large, so the indoor presence asymmetric radiation field intensity of the larger, causing different parts of the human body radiation heat exchanger.Secondly, three asymmetric radiation of the thermal environment Evaluation Method-EQT thermal comfort index, weighted PMV index, mean radiant temperature. According to the actual situation of the object of this study, using a weighted PMV as the evaluation indicators of the radiation environment of asymmetric radiant heat in the air-conditioned room.Thirdly, informed of the different parts of the human body skin temperature distribution is the study of human thermal comfort the basis of a non-uniform environment, the body’s own thermal regulation function is extremely important effect on the temperature distribution on the human body. Therefore, this article two node model based on Gagge Professor, established improved two-node human thermal regulation model and the introduction of human thermal regulation and control system by human thermal regulation model and CFD coupling technology accurately calculate the surface temperature of the different parts of the body distribution.Finally, large span, open office space for the object plane radiation physics, mathematical model of the air-conditioning based on human thermal regulation model coupled with CFD calculation, simulation analysis of the aspect ratio of the change of the radiating summer interior designthe relationship between temperature, winter indoor heat load and asymmetricadiation.