Optimization on fresh outdoor air ratio of air conditioning system with stratum ventilation for both targeted indoor air quality and maximal energy saving

Cheng, Y, Zhang, S, Huan, C, Oladokun, MO ORCID: https://orcid.org/0000-0001-5320-5219 and Lin, Z ORCID: https://orcid.org/0000-0002-9680-8121 2019, 'Optimization on fresh outdoor air ratio of air conditioning system with stratum ventilation for both targeted indoor air quality and maximal energy saving' , Building and Environment, 147 , pp. 11-22.

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Abstract

Stratum ventilation can energy efficiently provide good inhaled indoor air quality with a proper operation (e.g., fresh outdoor air ratio). However, the non-uniform CO2 distribution in a stratum-ventilated room challenges the provision of targeted indoor air quality. This study proposes an optimization on the fresh outdoor air ratio of stratum ventilation for both the targeted indoor air quality and maximal energy saving. A model of CO2 concentration in the breathing zone is developed by coupling CO2 removal efficiency in the breathing zone and mass conservation laws. With the developed model, the ventilation parameters corresponding to different fresh outdoor air ratios are quantified to achieve the targeted indoor air quality (i.e., targeted CO2 concentration in the breathing zone). Using the fresh outdoor air ratios and corresponding ventilation parameters as inputs, energy performance evaluations of the air conditioning system are conducted by building energy simulations. The fresh outdoor air ratio with the minimal energy consumption is determined as the optimal one. Experiments show that the mean absolute error of the developed model of CO2 concentration in the breathing zone is 1.9%. The effectiveness of the proposed optimization is demonstrated using TRNSYS that the energy consumption of the air conditioning system with stratum ventilation is reduced by 6.4% while achieving the targeted indoor air quality. The proposed optimization is also promising for other ventilation modes for targeted indoor air quality and improved energy efficiency.

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: National Natural Science Foundation of China, General Research Grant from the Research Grants Council of the Hong Kong Special Administrative Region, China
Depositing User: MO Oladokun
Date Deposited: 30 Jan 2020 14:41
Last Modified: 30 Jan 2020 15:13
URI: http://usir.salford.ac.uk/id/eprint/53102

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