Stratum-air-distributed radiant-convective room air conditioner for heating

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

8 Scopus Citations
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Author(s)

  • Jiankai Dong
  • Hongyong Lu
  • Dun Niu
  • Sheng Zhang
  • Zhaosong Fang

Detail(s)

Original languageEnglish
Article number112311
Journal / PublicationEnergy and Buildings
Volume271
Online published15 Jul 2022
Publication statusPublished - 15 Sept 2022

Abstract

The radiant-convective room air conditioner has been demonstrated to improve the coefficient of performance and the heating capacity effectively. However, the applicability of the radiant-convective room air conditioner in modulating the indoor thermal environment is unclear. This study proposes a stratum-air-distributed radiant-convective room air conditioner and evaluates its effectiveness for providing thermal comfort under heating mode with experimentally validated CFD simulations. Results show that the heat output of the radiant panel of the room air conditioner accounts for 20.7 %- 34.5 % of the total heat output. The supply airflow rate should be properly determined to balance the highly coupled heat output and air distribution. Compared with the conventional room air conditioner, the proposed room air conditioner under proper operation more effectively warms the occupied zone because of the enlarged heat output and improved air distribution, thereby increasing the predicted mean vote from −0.15 to −0.02, reducing the vertical air temperature difference from 6.7℃ to 0.8℃, and enhancing the thermal utilization effectiveness from −0.09 to 0.25. In addition, the draft rating and radiant temperature asymmetry of the proposed room air conditioner are thermally acceptable. Therefore, the proposed room air conditioner can modulate the indoor thermal environment energy-efficiently from the aspects of both overall and local thermal comfort.

Research Area(s)

  • Convective heating, Radiative heating, Room air conditioner, Stratum Air Distribution, Thermal comfort

Citation Format(s)

Stratum-air-distributed radiant-convective room air conditioner for heating. / Lu, Yalin; Dong, Jiankai; Lu, Hongyong et al.
In: Energy and Buildings, Vol. 271, 112311, 15.09.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review