温度均匀分布辐射冷顶板的传热特性

构建一种表面温度均匀分布的辐射冷顶板,分析其物理结构和传热机理,建立其辐射供冷传热过程的数学模型,利用MATLAB计算其供冷量,并通过该辐射冷顶板的热工特性试验验证模型的合理性,模拟得到的顶板温度和供冷量与实验结果的误差小于6%。通过对实验结果和计算结果的分析,研究发现在定流量稳态工况下,该辐射冷顶板结构由于存在空气夹层,顶板的供冷量随顶板温度的增大而增大,但受冷冻水温度的限制,顶板的温度在实际运行时宜保持在18~20℃之间。基于对实验数据的分析,研究了室内相对湿度随顶板温度的变化规律、房间的温度分布及其通过对流和辐射方式各自分担的冷负荷。

Heat Transfer Characteristics of a New Ceiling Radiant Cooling Panel with Uniform Temperature Distribution in the Surface

A new ceiling radiant cooling panel（CRCP） with a uniform temperature distribution in the surface was introduced, by analyzing the physical structure and heat transfer mechanism of CRCP. A mathematical model of the radiant heat transfer process was established, through which the cooling capacity of CRCP was calculated using MATLAB. Compared with the results of thermal performance test, the mathematical model was reasonable with a maximum error less than 6%. According to the results of model and experiment, in the constant flow condition, due to the air in the sandwich structure, cooling capacity of CRCP decreases as the temperature drops. Limited by the chilled water temperature, the temperature of CRCP usually is in range of 18-20 ℃. Based on the experimental ,the distribution of relative humidity and the temperature in the room and cold load undertaken by convection and radiation respectively in the room were also studied, aiming at providing some relevant basis for the application of CRCP system.