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

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

更新时间：2025-07-09

- Experimental Investigation on Thermal Decay in an Underfloor Plenum for Cooling Case
- Vol. 42, Issue 9, Pages: 1174-1178(2008)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 西安交通大学人居环境与建筑工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU83
- Online First：10 September 2008，
  
  Published：2008
- 稿件说明：
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Experimental Investigation on Thermal Decay in an Underfloor Plenum for Cooling Case[J]. 2008, 42(9): 1174-1178.
DOI：

Experimental Investigation on Thermal Decay in an Underfloor Plenum for Cooling Case[J]. 2008, 42(9): 1174-1178. DOI：

摘要

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%.

Abstract

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 non-adiabatic slab in our experiments.

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references

BAUMAN F, WEBSTER T. Outlook for underfloor air distribution [J]. ASHRAE Journal, 2001, 43(6): 18-27.

LOUDERMILK K. Underfloor air distribution solutions for open office applications [J]. ASHRAE Transactions, 1999, 105(1): 605-613.

MATSUNAWA K, LIZUKA H, TANABE S. Development and application of an underfloor air-conditioning system with improved outlets for a “smart” building in Tokyo [J]. ASHRAE Transactions, 1995, 101(2): 887-901.

BAUMAN F, PECORA P, WEBSTER T. How 1ow can you go? Airf1ow performance of low-height underf1oor plenums [EB/OL].[2007-05-20]. http:∥repositories. cellib. org/cedr/cbe/havc/Bauman 1999_Plenums.

LINDEN P F, KANDA I, YAMAGUCHI D. Flow in an underfloor plenum [C]∥The SimBuild 2004 Conference. Boulder, Colorado, USA: IBPSA, 2004: 1-5.

HUI Jin, BAUMAN F, WEBSTER T. Testing and modeling of underfloor air supply plenums [J]. ASHRAE Transactions, 2006, 112(2): 581-591.

孔琼香,俞炳丰,潘振.地板送风静压层内气流的数值模拟与送风特性实验 [J].西安交通大学学报,2005, 39(5):531-535.

KONG Qiongxiang, YU Bingfeng, PAN Zhen. Numerical simulation on the airflow in a plenum of underfloor air supply and experiment on the characteristics of the plenum's outlets [J]. Journal of Xi'an Jiaotong University, 2005,39(5): 531-535.

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