诱导送风与辐射复合空调夏季运行特性及系统能效分析

Analysis on operation characteristics and energy efficiency of radiation induced air supply integrated air-conditioning systemin summer

相比于对流型空调方式,辐射空调系统具有高舒适性和节能优势,但也存在易结露、负荷处理能力不足和启动慢等问题。为此,提出一种新型诱导送风与辐射复合空调末端,针对末端热工性能、防结露性能和启动性能等进行理论和实验研究。首先,建立其在夏季稳态工况下的末端热工性能仿真模型和系统能效评价模型,求解稳态工况下的辐射板平均温度和孔口送风温度等参数,通过实验验证模型的准确性;其次,研究不同风机风量下,末端诱导室内回风能力;最后,通过实验探究末端启动阶段特性。研究结果表明:单个末端一次风量在100~200 m^(3)/h区间内增长时,诱导比从0.28增大到0.41,可减少风机风量22%~30%;空调末端运行1 h,辐射孔板温度及送风状态参数趋于稳定,辐射板温与附近空气露点温度之间温差先减小后增大,最终趋于稳定,约为2.5℃;风机送风量在0~500 m3/h范围内,末端供冷能力满足室内需求,辐射换热在总显热处理中可占43%以上。该系统通过减少送风量降低输运能耗,通过降低辐射孔板温度增大供冷量,末端能效比可达到65,相比于传统风机盘管与空调箱提升20%。

Compared with convection air-conditioning system,radiation air-conditioning system has the advantages of high comfort and energy saving,but it has the disadvantages of condensation,load handling capacity and slow starting performance.A radiation-induced air supply integrated air-conditioning terminal(ac terminal)was put forward.Theoretical and experimental research was carried out to study the thermal performance,anti-condensation performance and start-up performance of the terminal.Thermal performance model and energy efficiency model of the system in summer were established to solve the average temperature of terminal and the supply air in steady conditions,and the accuracy of the model was verified by experiments.Secondly,influence of primary air volume on inducement performance was explored.Finally,the starting performance was explored through experiments.The results show that the induction ratio increases from 0.28 to 0.41 while the primary air volume of a terminal increases in the range of 100−200 m3/h,which can reduce the air volume of the fan by 22%−30%.The terminal is stable within 1 h,the difference between the terminal temperature and the air dew point temperature firstly decreases and then increases,and finally tends to be stable at 2.5°C.The terminal cooling capacity meets the indoor demand while the air volume of the fan is in the range of 0−500 m3/h,and the radiation heat transfer accounts for more than 43%of the total sensible heat transfer.The system reduces the transport energy consumption by reducing the air supply,and increases the cooling capacity by reducing the terminal temperature.The energy efficiency ratio can reach 65,which is 20%higher than that of the traditional convection air-conditioning system.