全空気式放射空調方式の熱性能に関する研究

抄録

 Radiation air-conditioning system is one of the means to improve heat environment. Many researchers have not yet examined air-type radiation air-conditioning system. Therefore, researchers should accumulate evaluation results and should establish design methods about air-type radiation air-conditioning system. A purpose of this study is to clarify a thermal performance of the air-type radiation air-conditioning system based on the actual survey result for cooling air-conditioning period in the office.
 In Chapter 2, we examined thermal performances of the air conditioners in the air-type radiation air-conditioning system. As a result of having analyzed the quantity of heat-treatment of the air conditioners, as for FCU rate of operation average, July and August were approximately 50%, and June and September were approximately 15%. A designer should consider that environmental improvement effect becomes small at the time when apparatus rate of operation is small.
 In Chapter 3, we analyzed thermal performances of the membrane radiation unit. The membrane radiation unit is air-blow port. A cooling air is gushed in the room by the surface which is fiber material. Because the temperature at the surface nears air-conditioned air temperature, the membrane radiation unit improves mean radiation temperature.
 We analyzed the amount of radiation heat transmission and surface temperature of the membrane radiation unit by the measurement data. On the design rating condition of the target system, the radiation heat capacity of the membrane radiation unit was approximately 33W/square meter. As the membrane surface temperature lowered, the amount of radiation heat transmission that the membrane radiation unit absorbed increased. In addition, the amount of radiation heat transmission became big as the surface temperatures of the room aspects became high. The time responsiveness of the surface temperature was high from the air-blow temperature.
 We led heat balance equation about the membrane radiation unit and jetted air. And we analyzed the convective heat transmission ratio of the membrane radiation unit from measurement data. The convective heat transmission ratio of the membrane radiation unit was value of 4～20W/(m2·K). If a passage wind velocity became big, the convective transmission ratio became big. A radiation environment may not be improved when a passage wind velocity becomes small. When designers plan the blowing surfaces large in order to increase form factors, it is important to consider the average passing wind speed of the blowing surfaces.
 We showed that a value of convective transmission ratio possible calculated amount of radiation heat transmission. We analyzed the influence of design conditions on radiation heat transmission ratio and radiation heat ratio. If an all heat of treatment is the same, a radiation temperature environment improves as a radiation heat ratio increases. A Radiation thermal performance can be estimated by verifying the convective heat transmission ratio of air-type radiation air-conditioning system.