A comparative study on energy efficiency and indoor thermal comfort of DOAS applied to multi-zone air-conditioning systems

Gaoming Ge, Fu Xiao, Lizhi Zhang

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Conventional air conditioning systems are facing great challenges considering indoor relative humidity control, system safety and effective ventilation in an energy efficient way. The dedicated outdoor air system (DOAS) is widely believed to overcome these problems. A DOAS-integrated system, which combines a DOAS with dry fan-coil units, is presented in this study. Energy efficiency and indoor thermal comfort of this air-conditioning scheme is investigated and compared with two conventional systems, i.e. wet fan-coil units and variable air volume systems, serving the same multi-zone space of an office building in Hong Kong. Control strategies for the DOAS-integrated system are also presented. Tests on two typical operation conditions, i.e. summer day and spring day, are conducted on the simulation platform of TRNSYS. Simulation results show that the DOAS-integrated dry fan-coil unit system can achieve the best indoor relative humidity on two typical days, and it consumes almost the same amount of energy as the wet fan-coil unit system on the summer day and about 5% more energy on the spring day. In addition, the effect of total heat recovery exchanger on energy saving in hot and humid regions is obvious and demonstrated.
Original languageEnglish
Title of host publicationProceedings - 6th International Symposium on Heating, Ventilating and Air Conditioning, ISHVAC 2009
Pages405-412
Number of pages8
Volume1
Publication statusPublished - 1 Dec 2009
Event6th International Symposium on Heating, Ventilating and Air Conditioning, ISHVAC 2009 - Nanjing, China
Duration: 6 Nov 20099 Nov 2009

Conference

Conference6th International Symposium on Heating, Ventilating and Air Conditioning, ISHVAC 2009
CountryChina
CityNanjing
Period6/11/099/11/09

Keywords

  • Building energy efficiency
  • Dedicated outdoor air system
  • Multi-zone air-conditioning
  • Thermal comfort

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Geography, Planning and Development

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