供暖工况下嵌入式空调房间传热关系及负荷分布特性的研究

Research on Heat Transfer Relationship and Load Distribution Characteristics of Embedded Air-Conditioning Room under Heating Conditions

为研究分析房间热量流动特征,在重庆地区某办公房间内搭建以133个温度测点为基础的温度场测试系统,不间断测试10小时,每十秒采集一次数据,得到3600个时刻的温度场数据。通过绘制热量传递网络图的方法,来计算各表面之间的辐射、对流换热量。在传统空调器的研究中往往忽略辐射作用的影响,但在实验测试中发现在嵌入式空调房间顶板向其他围护结构表面的辐射换热量高达391.4W,占空调器总传热量的28.5%,虽然不是传热途径中的主要手段但也是不可忽视的一部分;并比较网络法求解顶板辐射传热量与虚构表面法求解的差异性,计算得两者相差3.06%。根据实验结果分析发现围护结构负荷中顶板向上方未供暖房间传热形成的负荷占据主导地位,此项负荷远大于外围护结构向室外空气传热部分,占房间围护结构总负荷的30.49%,外围护结构负荷占房间围护结构总负荷的17.28%,这主要是由于顶板面积远大于外墙面积,同时顶板未采取任何保温措施,导致温差较大,两者相乘使得顶板负荷远大于其他围护结构。由此可见对房间顶板进行保温处理是有着巨大的节能潜力的,此实验结果有助于研究南方地区以空调器供暖房间负荷计算,并根据顶板温度分布特性有针对性的对楼板围护结构进行节能改造。

In order to study and analyze the heat flow characteristics of the room,a temperature field test system based on 133 temperature measurement points was built in an office room in Chongqing.The test was performed continuously for 10 hours,and data was collected every ten seconds to obtain the temperature field at 3,600 moments data.By drawing the heat transfer network diagram,the radiation and convection heat transfer between the surfaces are calculated.In the research of traditional air conditioners,the influence of radiation is often ignored.However,in experimental tests,it is found that the radiant heat transfer from the ceiling of the embedded air conditioner room to the surface of other enclosure structures is as high as 391.4W,which accounts for 28.5%of the total heat transfer of the air conditioner.Although it is not the main method in the heat transfer path,it is also a part that cannot be ignored.The difference between the network method and the imaginary surface method for the radiative heat transfer of the roof is compared,and the difference between the two is 3.06%.According to the analysis of the experimental results,it is found that the load caused by the heat transfer of the roof to the upper unheated room in the envelope structure is dominant, and this load is much larger than the heat transfer part of the envelope structure to the outdoor air. It accounts for 30.49% of the total load of the room envelope structure, and the load of the outer envelope structure accounts for 17.28% of the total load of the room envelope structure. This is mainly because the roof area is much larger than the outer wall area, and the roof does not take any heat preservation measures, resulting in a relatively large temperature difference Large, the multiplication of the two makes the roof load much greater than other enclosure structures. It can be seen that the thermal insulation treatment of the roof of the room has huge energy-saving potential. The results of this experiment are helpful to study the calculation of the load of the room heating by air conditioners in the southern area, and the floor envelope structure is targeted according to the temperature distribution characteristics of the roof. Energy Saving.