相变蓄能火炕热舒适性的试验

传统火炕炕面温差很大,为提高炕面温度分布的均匀性、延长炕面供暖时间,将石蜡与炕体相结合以充分利用相变材料的恒温蓄换热特性,对比测试传统火炕房间与相变火炕房间的相关温度。测试结果表明:传统火炕的炕面温差很大,最大温差接近80℃,而相变蓄能火炕的炕面温度分布较为均匀,炕面最大温差仅5℃;此外,相变火炕房间的室内温度熄火后仍呈现上升趋势,直至凌晨之后才开始下降,其室内平均温度比普通房间高2.93℃。相变蓄热火炕显著改善了炕面温度分布的均匀性,有效延长了供暖时间并提高了室内温度,因而有助于改善农居室内及炕面的热舒适性。

Experiment on thermal comfort performance of phase-change energy storage Kang

Kang plays an important and indispensable role of winter heating in the rural houses of northern China and some extremely frigid zones. The surface temperature difference of traditional Kang is too large and its indoor temperature is too low, which can’t provide good thermal comfort. In order to improve the uniformity of Kang’s surface temperature distribution, increase the indoor thermal comfort and prolong the Kang’s heating time, this paper presented the phase-change energy storage Kang which combined paraffin and traditional Kang to take full advantage of the heat storage of phase-change materials. In order to analyze Kang’s surface temperature distribution and indoor thermal comfort of this phase-change energy storage Kang, a contrast experiment was carried out in 2 experimental rooms which basically had the same size, the same structure and the same pattern located in ecological park of Shenyang Jianzhu University. Comparative analysis method was used in the experiment to compare the thermal performance of the phase-change energy storage Kang and the traditional Kang. The 2 kinds of Kang were respectively set in the different experimental rooms, which had the same heating time and burned the same amount of fuel wood (6 kg). The experiment was operated from 8:00 am, March 15th to 8:00 am, March 18th in 2013, and fired 3 times every day, and each time lasted 90 minutes, which were respectively 7:30-9:00, 11:30-13:00 and 17:00-18:30. The XMZ*-J series universal input circuit detector was used to test and record the experimental data about the surface temperatures of different Kang and the indoor temperatures of experiment rooms. The test data of March 17th showed: the average temperatures of the head, medium and tail of traditional Kang were 61.95, 37.10 and 32.57℃, respectively, and the surface temperature difference of traditional Kang was around 30℃; while the average temperatures of the head, middle and tail of phase-change energy storage Kang were 40.87, 37.10 and 35.69℃, respectively, and the largest surface temperature difference of phase-change energy storage Kang was lower than 5℃. In addition, the surface temperature of traditional Kang was dropping down fast after the fire stopped, but that of phase-change energy storage Kang was still rising quite a long time after the fire stopped, which efficiently prolonged the Kang’s heating time; during the night, the surface temperature of the phase-change energy storage Kang declined slower than the traditional Kang, and the average surface temperature was higher than the traditional Kang from 0 am to 7 am, so the advantage of phase-change energy storage Kang was obvious. What was more, during the experiment period, the average indoor temperature in the room with traditional Kang was 12.91℃, while the average indoor temperature in the room with the phase-change energy storage Kang was 15.84℃, which was around 3℃ higher than the room with traditional Kang, and the indoor temperature fluctuation in the room with phase-change energy storage Kang was smaller than that with the traditional Kang; after 19:20, the indoor temperature in the room with the traditional Kang began to decrease, but the indoor temperature in the room with the phase-change energy storage Kang continued to rise till 0 am, and was higher than the room with the traditional Kang during the night, and the use of phase-change material could prong the indoor heating time for 5 h. Through comparing the surface temperatures of 2 kinds of Kang and their indoor temperatures, the following conclusions can be drawn: the phase-change energy storage Kang has better heating effect, and the thermal comfort of Kang’s surface and indoor environment for the phase-change energy storage Kang is better than the traditional Kang. The phase-change energy storage Kang has great promotional value.