Subzone control method of stratum ventilation for thermal comfort improvement

Zhang, S, Cheng, Y, Oladokun, MO ORCID: https://orcid.org/0000-0001-5320-5219 and Lin, Z ORCID: https://orcid.org/0000-0002-9680-8121 2019, 'Subzone control method of stratum ventilation for thermal comfort improvement' , Building and Environment, 149 , pp. 39-47.

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Abstract

The conventional control method of a collective ventilation (e.g., stratum ventilation) controls the averaged thermal environment in the occupied zone to satisfy the averaged thermal preference of a group of occupants. However, the averaged thermal environment in the occupied zone is not the same as the microclimates of the occupants, because the thermal environment in the occupied zone is not absolutely uniform. Moreover, the averaged thermal preference of the occupants could deviate from the individual thermal preferences, because the occupants could have different individual thermal preferences. This study proposes a subzone control method for stratum ventilation to improve thermal comfort. The proposed method divides the occupied zone into subzones, and controls the microclimates of the subzones to satisfy the thermal preferences of the respective subzones. Experiments in a stratum-ventilated classroom are conducted to model and validate the Predicted Mean Votes (PMVs) of the subzones, with a mean absolute error between 0.05 scale and 0.14 scale. Using the PMV models, the supply air parameters are optimized to minimize the deviation between the PMVs of the subzones and the respective thermal preferences. Case studies show that the proposed method can fulfill the thermal constraints of all subzones for thermal comfort, while the conventional method fails. The proposed method further improves thermal comfort by reducing the deviation of the achieved PMVs of subzones from the preferred ones by 17.6%–41.5% as compared with the conventional method. The proposed method is also promising for other collective ventilations (e.g., mixing ventilation and displacement ventilation).

Item Type: Article
Schools: Schools > School of the Built Environment
Journal or Publication Title: Building and Environment
Publisher: Elsevier
ISSN: 0360-1323
Related URLs:
Funders: General Research Grant from the Research Grants Council of the Hong Kong Special Administrative Region, China, Fundamental Research Funds for the Central Universities, China
Depositing User: MO Oladokun
Date Deposited: 30 Jan 2020 15:11
Last Modified: 30 Jan 2020 15:15
URI: http://usir.salford.ac.uk/id/eprint/53101

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