屏风式辐射供暖末端热舒适性及节能性分析

Analysis of the thermal comfort degree and the energy conservation facility of the partition-type radiant terminals during the winter season

为了研究工位屏风式辐射供暖末端的舒适性及节能性,通过问卷调查的方式收集了20位受试者在不同室内环境空气温度（14℃、16℃和18℃）、不同板面温度（50℃和60℃）下的主观反应（热感觉、热舒适、热可接受度和热期望）,并进行了对比分析。结果表明,室内环境空气温度为16℃且屏风式辐射末端板面温度为60℃时,受试者平均热感觉达到热中性,且仍满足ASHRAE规范中80%可接受范围的要求。另外,受试者在使用辐射供暖末端后,热可接受度也得到了明显提升,同时降低了对温暖环境的期望。同时利用Energy Plus对长沙某办公建筑房间的全年供暖能耗进行了模拟,结果表明,与室内空调温度设为20℃的情况相比,室内环境空气温度为16℃且板面温度60℃的试验条件,既能保证人体热舒适,还能降低25%以上的供暖能耗。

we have managed to collect interactive response of entirely 20 subjects （10 males and 10 females） to the cold environments at the temperatures of 14, 16 and 18 ℃ （at the relative humidity of 50% ） respectively with the surface temperatures of the partitiontype radiant terminal reaching 50 ℃ or 50 ℃. On the other hand, we have managed to collect the subjective response （the thermal sensation, comfort, acceptability and their own expectations） and partition-type radiant terminal＇ s power through the questionnaire-response and physical measuring tests during each group of testing series. And, in turn, the results obtained indi- cate that the partition-type radiant terminal test can significantly help to improve the thermal sensation and the thermal comfort of the subjects in the needed environment. More exactly speaking, its comfort effects should be provided in a more significant way with the room-in temperature of 14 and 16 % rather than 18 0C. For example, under the condition of the partition-type radiant ter- minal （60 ℃ ）, the average thermal sensation of the subjects can be found at the temperature of 16 T： at the neutral level, which is supposed to meet 80% of the acceptable demands of the ASHRAE Standard 55. What is more, the thermal acceptability of the subjects can be greatly improved when the partition-type radiant terminal keeps running, and, simultaneously, the thermal expectation of the subjects for warmer environments can be likely to get reduced. Besides, the thermal temperature of the partition-type radiant terminal, which is merely expected to keep their own thermal comfort, can be raised due to the cooler ambient environment. In such a case, when the air temperature drops from 18 ℃ to 16 T：, it would be necessary for the heating temperature to be raised from 50 ℃ to 60 ℃ so as to keep the subjects＇ thermal comfort. In the meantime, the corresponding heating power of each terminal can be uplifted from 160 W to 250 W. Further- more, according to the data obtained through the simulations through Energy Plus, as the room-in set-point temperature may be extended to 16 ℃, while the partition-type radiant terminal would be in a position to shorten over 20% of the heating period each year, so as to be able to save about 25% of the energy consumption as compared with the condition given by using the conventional air conditioning systems in the room-in set-point temperature of 20 ℃, say, in case of Changsha, Hunan. Thus, it can be said that the results developed in this paper can provide a practical innovative approach both to the extension of the comfort of temperature and energy consumption in the residential and office buildings,