Indoor cooling/heating load analysis based on coupled simulation of convection, radiation and HVAC control

Citation
T. Kim et al., Indoor cooling/heating load analysis based on coupled simulation of convection, radiation and HVAC control, BLDG ENVIR, 36(7), 2001, pp. 901-908
Citations number
6
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
BUILDING AND ENVIRONMENT
ISSN journal
0360-1323 → ACNP
Volume
36
Issue
7
Year of publication
2001
Pages
901 - 908
Database
ISI
SICI code
0360-1323(200108)36:7<901:ICLABO>2.0.ZU;2-8
Abstract
A computational fluid dynamics (CFD) simulation for analyzing indoor coolin g/heating load is presented in this study. It is coupled with a radiative h eat transfer simulation and heating, ventilating, and air-conditioning (HVA C) controlling system in a room. This new method feeds back the outputs of the HVAC system control to the input boundary conditions of the CFD, and th is method includes a human model to evaluate the thermal environment. It wo uld be used to analyze the heating/cooling loads of different HVAC systems under the condition of the same human thermal sensation (e.g. PMV, operativ e temperature, etc.) even though the temperature and air-velocity distribut ion in the room are different from each other. To examine the performance of the new method, a cooling load and a thermal environment within a semi-enclosed space, which opens into an atrium space, is analyzed under the steady-state conditions during the summer season. Th is method is able to analyze the indoor cooling load with changes of target thermal environments of a room and/or changing clothing conditions of occu pants considering the temperature and air-velocity distribution in the room . In this paper, two types of HVAC system are compared; i.e. radiation-pane l system and all-air cooling system. The radiation-panel cooling system is found to be more energy efficient for cooling the semi-enclosed space. Chan ges of the level of thermal environment reduce cooling load effectively in case of the all-air cooling system while the radiation-panel system does no t reduce cooling load even though the targeted thermal condition is relaxed . Energy saving effect is expected by easing the clothing conditions of occ upants. In this study, the reducing effect of cooling load is quantitativel y evaluated with clothing conditions also. (C) 2001 Elsevier Science Ltd. A ll rights reserved.