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Sustainability 2016, 8(8), 732; doi:10.3390/su8080732

Investigations on the Energy Efficiency of Stratified Air Distribution Systems with Different Diffuser Layouts

1
College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
College of Civil Engineering, Hunan University, Changsha 410082, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Marc A. Rosen
Received: 27 May 2016 / Revised: 25 July 2016 / Accepted: 27 July 2016 / Published: 30 July 2016
(This article belongs to the Special Issue Renewable Energy Applications and Energy Saving in Buildings)
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Abstract

This paper investigated the influence of diffuser layouts on the energy performance of stratified air distribution systems (STRAD). The energy saving potentials of STRAD systems are theoretically analyzed. The cooling coil load of a STRAD system is proportion to the return air temperature, while inversely proportional to the exhaust air temperature. Based on that, numerical studies are conducted for the applications of STRAD systems in three typical building space types. Two evaluation indices are developed to assess the energy performance of STRAD systems. The simulation results demonstrated that further energy saving could be achieved by keeping the exhaust grille at ceiling level and decreasing the height of return grille. Therefore, in order to optimize the energy saving capacity of STRAD systems, the return grille is recommended to be located as low as possible, whilst paying special attention on the “short-circuit” of cold supply air. Furthermore, when the STRAD system is applied in large space buildings with a big horizontal span, supply diffusers should be distributed surrounding the occupied zone as uniformly as possible, while avoiding installing return diffusers at exterior walls. View Full-Text
Keywords: stratified air distribution; diffuser layout; energy saving; building space types stratified air distribution; diffuser layout; energy saving; building space types
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Cheng, Y.; Yang, J.; Du, Z.; Peng, J. Investigations on the Energy Efficiency of Stratified Air Distribution Systems with Different Diffuser Layouts. Sustainability 2016, 8, 732.

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