低温供暖系统中散热器与风机盘管的供暖效果

Heating Effect of Radiator and Fan Coil Unit in Low Temperature Heating System

利用Airpak软件对北京地区煤改电中某农机站小型食堂进行室内热环境的数值模拟,对采用散热器和立式风机盘管两种不同散热末端的房间进行流场模拟,分析人员静坐状态下(1. 2 m高度水平面)的温度场、速度场、预计平均热感觉指数(PMV)和预期不满意率(PPD),通过流场模拟与实测结果的分析说明了在低温供暖系统中采用散热器和风机盘管两种不同的散热末端的特性以及对室内热环境的影响。结果表明,在同一个热源下,使用风机盘管进行供暖的房间在温度和PMV-PPD指数上优于散热器房间,人们的不满意度较小;使用散热器进行供暖的房间温度稳定性较好,适合需要连续供暖的房间;采用数值模拟得到的房间温度略低于实测温度,在一定程度上可以为北京地区煤改电中低温供暖系统合理选择散热末端提供参考。

Airpak software was used to simulate the indoor thermal environment of a small canteen of an agricultural machinery station in Beijing,and the flow field of two rooms with radiator and vertical fan-coil unit were simulated. The temperature field,velocity field,predicted mean vote( PMV) and predicted percentage of dissatisfied( PPD) of the analyst in sitting state( 1. 2 m level) were analyzed. Through the analysis of the flow field simulation and the measured results,the characteristics of two different heat sink terminals,radiator and fan-coil unit,and their effects on indoor thermal environment in low-temperature heating system were illustrated. The results show that under the same heat source,the room heated by fan coil unit is better than that heated by radiator in temperature and PMV-PPD index,and people’s dissatisfaction is smaller. The room heated by radiator has better temperature stability and is suitable for the room that needs continuous heating. The room temperature obtained by numerical simulation is slightly lower than the measured temperature. To a certain extent,it can provide a reference for the reasonable selection of heat dissipation terminal in the low-temperature heating system of coal-to-electricity conversion in Beijing.