供冷工况地板送风静压层热力衰减的实验研究

Experimental Investigation on Thermal Decay in an Underfloor Plenum for Cooling Case

对不同进风参数和不同室内热源条件下地板送风静压层的热力衰减进行了实验研究。实验结果表明：典型供冷工况下静压层内温度具有不均匀分布的特点，随着气流流程的增加，静压层内空气温升增大；随着送风量的减小，静压层内温度分布更不均匀；送风温度的改变对静压层内空气相对温升的影响较小；室内热源对静压层内热衰减影响较大；在楼板没有加绝热层的实验条件下，静压层的进送风温差与总进回风温差之比为18％～33％。

Experiments were conducted to investigate thermal decay in an underfloor plenum under different inlet air conditions and heat sources located in the test room on the plenum. The results show that the air temperature distribution in the plenum was not uniform for typical cooling case, and the air temperature in the plenum rose with the distance that the inlet air traveled. Moreover, lower rates of air flow caused more non-uniform air temperature distribution in the plenum, and the change of inlet air temperature had small effect on the relative air temperature rise in the plenum while the effect of room heat sources on the thermal decay in the plenum was significant. In addition, the ratio of temperature difference between supply air and inlet air in the plenum to the temperature difference between return air and inlet air was 18%-33% for the nonadiabatic slab in our experiments.