Air Diffusion Performance Index (ADPI) of diffusers for heating mode

被引:42
作者
Liu, Shichao [1 ]
Novoselac, Atila [1 ]
机构
[1] Univ Texas Austin, Dept Civil Architectural & Environm Engn, Austin, TX 78712 USA
关键词
Diffuser; ADPI; Air heating; Effective draft temperature; PMV index; Thermal stratification; THERMAL COMFORT; VENTILATION EFFECTIVENESS; ENVIRONMENTS; HVAC; STRATEGIES; BUILDINGS;
D O I
10.1016/j.buildenv.2015.01.021
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper proposes an Air Diffusion Performance Index (ADPI) model for diffuser selection when considering the operation in all-air heating mode. The model uses Fanger's Predicted Mean Vote (PMV) Index adopted by ANSI/ASHRAE Standard-55 to develop the relation between indoor air temperature and velocity. This paper also generates an ADPI selection guide for the application of 13 types of widely used ceiling, high sidewall and linear slot diffusers. The selection guide is developed based on 97 experiments in a full-scale environmental chamber by measuring the ADPI as a function of two factors: (1) the ratio of throw length of jets from diffusers to room characteristic length, and (2) diffuser types. Moreover, the measurements consider different diffuser sizes and manufactures. The selection guide discusses possible thermal stratification occurring at heating mode conditions and incorporates this factor into the proposed ADPI model. Overall, the measurements show that all 13 types of diffusers can generate ADPI greater than 80% when they are properly used. However, some diffusers are less sensitive to the variation of supply airflow rate than others. Linear bar grilles and round ceiling diffusers are the most suitable for application when supply flow varies during HVAC operation. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:215 / 223
页数:9
相关论文
共 30 条
[1]  
[Anonymous], ASHRAE T 1
[2]  
[Anonymous], 2010, ANSI/ASHRAE Standard 55-2010
[3]  
ASHRAE, 2006, 702006 ANSIASHRAE
[4]  
ASHRAE, 2009, 1132009 ANSIASHRAE
[5]  
Bjarne WO, 2004, ASHRAE J AUG, P20
[6]  
Fanger P.O., 1970, Thermal comfort, V1st
[7]   Literature survey on how different factors influence human comfort in indoor environments [J].
Frontczak, Monika ;
Wargocki, Pawel .
BUILDING AND ENVIRONMENT, 2011, 46 (04) :922-937
[8]   A critical review of observation studies, modeling, and simulation of adaptive occupant behaviors in offices [J].
Gunay, H. Burak ;
O'Brien, William ;
Beausoleil-Morrison, Ian .
BUILDING AND ENVIRONMENT, 2013, 70 :31-47
[9]  
Houghten F.C., 1938, ASHRAE Transactions, V44, P289
[10]  
Huang Y, 1999, ENERGY ANAL PROGRAM, V7