低温地面辐射供暖间歇运行室温变化模拟
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摘要
建立低温地面辐射供暖房间模型,利用Fluent软件对节热供暖过程及升温供暖过程进行数值模拟,探究低温地面辐射供暖系统间歇运行过程中地面的蓄放热特性以及室温的变化特性。研究结果表明:在正常连续供暖、供回水平均温度为308. 15 K时,室内温度一天中基本保持平稳,维持在室内设计温度293. 15 K。当系统停止供暖后,约33 h,地面释热过程结束。当供回水平均温度分别为308. 15 K、318. 15 K和328. 15 K时,开始供暖后,分别经过13 h、16 h和20 h,地面蓄热过程结束。对房间供暖,低温辐射地面供回水平均温度越高,地面表面温度上升速度越快,温度升高幅度越大,相应的地面蓄热时间越长。升温供暖过程中,开始供暖后2 h内,尽管低温辐射地面供回水平均温度不同,但室温变化特性完全相同。开始供暖2 h后,低温辐射地面供回水平均温度越高,室温上升速度越快。低温辐射地面供回水平均温度分别为308. 15 K、318. 15 K和328. 15K时,室温上升至满足人体热舒适性要求的291. 15 K所用时间分别为17. 5 h、12 h、8. 5 h。
The model of low-temperature floor radiant heating room is established. The numerical simulation of heat-saving heating process and warm-up heating process is performed by Fluent software. The heat storage and release characteristics of the floor in the intermittent operation of the low-temperature floor radiant heating system and the change characteristics of room temperature are investigated. The results show that the indoor temperature remains basically stable in one day,and is maintained at the indoor design temperature of 293. 15 K when the average temperature of supply water and return water is 308. 15 K in normal continuous heating. The floor heat release process ends when the system stops heating,about 33 hours. When the average temperatures of the supply water and return water are 308. 15 K,318. 15 K and 328. 15 K,respectively,after the heating starts,the floor heat storage process ends after 13 h,16 h and 20 h respectively.For heating the room,the higher the average tempera-ture of the low-temperature radiant floor supply water and return water,the faster the floor surface temperature rise,the greater the temperature rise amplitude,and the longer the floor heat storage time. During the warm-up heating process,within 2 h after the start of heating,although the average temperature of the lowtemperature radiant floor supply water and return water is different,the room temperature change characteristics are exactly the same. After heating for 2 h,the higher the low-temperature radiant floor supply water and return water,the faster the room temperature rise. When the average temperatures of the low-temperature radiant floor supply water and return water are 308. 15 K,318. 15 K and 328. 15 K respectively,the time taken for rising the room temperature to 291. 15 K which meets the thermal comfort requirements of human body is 17. 5 h,12 h and 8. 5 h,respectively.
The model of low-temperature floor radiant heating room is established. The numerical simulation of heat-saving heating process and warm-up heating process is performed by Fluent software. The heat storage and release characteristics of the floor in the intermittent operation of the low-temperature floor radiant heating system and the change characteristics of room temperature are investigated. The results show that the indoor temperature remains basically stable in one day,and is maintained at the indoor design temperature of 293. 15 K when the average temperature of supply water and return water is 308. 15 K in normal continuous heating. The floor heat release process ends when the system stops heating,about 33 hours. When the average temperatures of the supply water and return water are 308. 15 K,318. 15 K and 328. 15 K,respectively,after the heating starts,the floor heat storage process ends after 13 h,16 h and 20 h respectively.For heating the room,the higher the average tempera-ture of the low-temperature radiant floor supply water and return water,the faster the floor surface temperature rise,the greater the temperature rise amplitude,and the longer the floor heat storage time. During the warm-up heating process,within 2 h after the start of heating,although the average temperature of the lowtemperature radiant floor supply water and return water is different,the room temperature change characteristics are exactly the same. After heating for 2 h,the higher the low-temperature radiant floor supply water and return water,the faster the room temperature rise. When the average temperatures of the low-temperature radiant floor supply water and return water are 308. 15 K,318. 15 K and 328. 15 K respectively,the time taken for rising the room temperature to 291. 15 K which meets the thermal comfort requirements of human body is 17. 5 h,12 h and 8. 5 h,respectively.
引文
[1]清华大学建筑节能研究中心.中国建筑节能年度发展研究报告2008[M].北京:中国建筑工业出版社,2008:186-187.
[2]邵博,孙春华,陈彩苓,等.温控阀调节间歇用热方式对室内温度的影响[J].煤气与热力,2016,36(3):A12-A13.
[3]贺平,孙刚.供热工程. 4版.北京:中国建筑工业出版社,1993:19-20.
[4]姜会飞,温德永,李楠,等.利用正弦分段法模拟气温日变化[J].气象与减灾研究,2010,33(3):61-65.
[5]李兆坚,江亿,燕达.住宅间歇供暖模拟分析[J].暖通空调,2005,35(8):110-113.
[2]邵博,孙春华,陈彩苓,等.温控阀调节间歇用热方式对室内温度的影响[J].煤气与热力,2016,36(3):A12-A13.
[3]贺平,孙刚.供热工程. 4版.北京:中国建筑工业出版社,1993:19-20.
[4]姜会飞,温德永,李楠,等.利用正弦分段法模拟气温日变化[J].气象与减灾研究,2010,33(3):61-65.
[5]李兆坚,江亿,燕达.住宅间歇供暖模拟分析[J].暖通空调,2005,35(8):110-113.