Experimental comparison of local low velocity unit combined with radiant panel and diffuse ceiling ventilation systems

Weixin Zhao*, Simo Kilpeläinen, Risto Kosonen, Juha Jokisalo

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
25 Downloads (Pure)

Abstract

In this study, the performance of a micro-environment system was analysed and compared with diffused ceiling ventilation. In the analysed micro-environment low velocity radiant panel system, two low velocity units and radiant panels were installed above workstations to supply directly clean air to occupants and to cover the cooling power required. With diffused ceiling ventilation, all cooling demand is covered with air and thus, the airflow rate required is higher than with low velocity radiant panel system. The varied heat gain from 40 to 80 W/m2 consists of two seated dummies, laptops, monitors and simulated solar gain. The results show that with perimeter exhaust and local supply air, 8–13% reduction of the total cooling load required is possible, in comparison to the standard mixing systems. The average exhaust temperature was 0.7–1.9°C higher than average room air temperature at the workstation. Moreover, the mean air temperature with the low velocity radiant panel system at the occupied zone was 0.6°C lower than with diffused ceiling ventilation. With low velocity radiant panel system, the air velocity was less than 0.12 m/s in the occupied zone. Also, the draught rate was less than 10%. Furthermore, the air change efficiency with the low velocity radiant panel system was over 70% which is better than 44–49% efficiency with diffused ceiling ventilation.
Original languageEnglish
Article numberARTN 1420326X20918398
Pages (from-to)895-914
Number of pages20
JournalIndoor and Built Environment
Volume29
Issue number6
Early online date4 May 2020
DOIs
Publication statusPublished - 1 Jul 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • micro-environment
  • personalized ventilation
  • diffuse ceiling ventilation
  • radiant cooling
  • thermal comfort
  • air change efficiency

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