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Optimal supply air temperature with respect to energy use in a variable air volume system

Engdahl, Fredrik LU and Johansson, Dennis LU (2004) In Energy and Buildings 36(3). p.205-218
Abstract
In a variable air volume (VAV) system with 100% outdoor air, the cooling need in the building is satisfied with a certain air flow at a certain supply air temperature. To minimize the system energy use, an optimal supply air temperature can be set dependent on the load, specific fan power (SFP), chiller coefficient of performance, outdoor temperature and the outdoor relative humidity. The theory for an optimal supply air temperature is presented and the heating, ventilation and air-conditioning (HVAC) energy use is calculated depending on supply air temperature control strategy, average U-value of the building envelope and two outdoor climates. The analyses show that controlling the supply air temperature optimally results in a... (More)
In a variable air volume (VAV) system with 100% outdoor air, the cooling need in the building is satisfied with a certain air flow at a certain supply air temperature. To minimize the system energy use, an optimal supply air temperature can be set dependent on the load, specific fan power (SFP), chiller coefficient of performance, outdoor temperature and the outdoor relative humidity. The theory for an optimal supply air temperature is presented and the heating, ventilation and air-conditioning (HVAC) energy use is calculated depending on supply air temperature control strategy, average U-value of the building envelope and two outdoor climates. The analyses show that controlling the supply air temperature optimally results in a significantly lower HVAC energy use than with a constant supply air temperature. The optimal average U-value of the building envelope is in practise mostly zero. (C) 2003 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
supply air temperature, heating, ventilation and air-conditioning, variable air volume system
in
Energy and Buildings
volume
36
issue
3
pages
205 - 218
publisher
Elsevier
external identifiers
  • wos:000220762100001
  • scopus:1542742127
ISSN
1872-6178
DOI
10.1016/j.enbuild.2003.09.007
language
English
LU publication?
yes
id
07a20de5-96ea-44e6-a7f8-b7fff2a20328 (old id 281663)
date added to LUP
2007-10-22 08:39:56
date last changed
2017-12-10 03:52:57
@article{07a20de5-96ea-44e6-a7f8-b7fff2a20328,
  abstract     = {In a variable air volume (VAV) system with 100% outdoor air, the cooling need in the building is satisfied with a certain air flow at a certain supply air temperature. To minimize the system energy use, an optimal supply air temperature can be set dependent on the load, specific fan power (SFP), chiller coefficient of performance, outdoor temperature and the outdoor relative humidity. The theory for an optimal supply air temperature is presented and the heating, ventilation and air-conditioning (HVAC) energy use is calculated depending on supply air temperature control strategy, average U-value of the building envelope and two outdoor climates. The analyses show that controlling the supply air temperature optimally results in a significantly lower HVAC energy use than with a constant supply air temperature. The optimal average U-value of the building envelope is in practise mostly zero. (C) 2003 Elsevier B.V. All rights reserved.},
  author       = {Engdahl, Fredrik and Johansson, Dennis},
  issn         = {1872-6178},
  keyword      = {supply air temperature,heating,ventilation and air-conditioning,variable air volume system},
  language     = {eng},
  number       = {3},
  pages        = {205--218},
  publisher    = {Elsevier},
  series       = {Energy and Buildings},
  title        = {Optimal supply air temperature with respect to energy use in a variable air volume system},
  url          = {http://dx.doi.org/10.1016/j.enbuild.2003.09.007},
  volume       = {36},
  year         = {2004},
}