Influence of Return-Air Outlet Position on Artifacts' Preservation Environment with Displacement Ventilation System

doi:10.7652/xjtuxb201905016

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Influence of Return-Air Outlet Position on Artifacts' Preservation Environment with Displacement Ventilation System

更新时间：2025-07-09

- Influence of Return-Air Outlet Position on Artifacts' Preservation Environment with Displacement Ventilation System
- Vol. 53, Issue 5, Pages: 115-122(2019)
- 作者机构：
  
  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：10.7652/xjtuxb201905016
  CLC： TU834.3
- Online First：10 May 2019，
  
  Published：2019
- 稿件说明：
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Influence of Return-Air Outlet Position on Artifacts' Preservation Environment with Displacement Ventilation System[J]. 2019, 53(5): 115-122.
DOI：

Influence of Return-Air Outlet Position on Artifacts' Preservation Environment with Displacement Ventilation System[J]. 2019, 53(5): 115-122. DOI： 10.7652/xjtuxb201905016.

摘要

针对遗址文物局部保存环境置换通风调控存在空调负荷高、空间温度梯度大等问题

提出将回风口朝下布置在文物区内以减少对非空调区空气卷吸的改进方法

降低了空调负荷

提高了文物区环境的均匀性。基于现有遗址博物馆实验展厅

进一步搭建了文物区局部置换通风调控系统

对比研究了自然通风工况和回风高度分别为0.4、0.9、1.6 m的3种置换通风工况下

文物区温湿度空间分布特征和空调负荷能耗。研究结果表明:置换通风调控系统有效地改善了文物区环境的稳定性

距坑底0.2 m的范围内温度和相对湿度的波动值较自然工况分别降低了50%和88%; 文物区垂直方向上出现了0.2～0.7 m和1.5～1.7 m的两个热力分层

随着回风口高度的降低

置换通风系统对文物区环境参数的调控性能增强

热分层的高度和有效调控高度降低; 回风口朝下设置与原方案相比

空调负荷平均降低了57.2%

并且当回风口的高度从1.6 m降低到0.4 m时

单位面积空调负荷进一步降低了22.7 W/m

。研究结果可为文物区局部环境置换通风调控系统设计提供参考。

Abstract

To solve the problems of high energy consumption and large temperature gradient in the local environment control of relics preservation in heritage museum with displacement ventilation(DV)system

an improved DV system

which can reduce the air entrainment from the unconditioned area by laying return-air inlet downwards at the preservation area

was developed. Based on current experimental museum exhibition hall

an experimental setup of the proposed DV system was built. Thus

experiments on natural ventilation system and three DV systems with the heights of return air of 0.4

0.9 and 1.6 m were performed

and th

e distributions of temperature and humidity as well as the energy consumption of the system in all test cases were compared and analyzed. The experimental results showed that the DV system could effectively improve the stability of the preservation environment. The fluctuations in temperature and relative humidity were decreased by 50% and 88%

respectively

at a height of 0.2 m from the pit bottom

compared with that of natural ventilation system. Consequently

two thermal stratifications

i.e.

0.2-0.7 m and 1.5-1.7 m were formed in the vertical direction of the preservation area. With the lowering of the height of return air

the DV system enhanced the control over the environmental parameters in the preservation area

and the height of thermal stratification and effective control height were low. Since the downward layout of return-air inlet was set

the load of air-conditioning was decreased by 57.2% averagely compared with the original design. In addition

when the height of return-air inlet decreased from 1.6 m to 0.4 m

the load of air-conditioning per unit area was further decreased by 22.7 W/m

. These results could be used as reference for the design of displacement ventilation control systems.

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references

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张哲 1

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