Integrated system of exhaust air heat pump and advanced air distribution for energy-efficient provision of outdoor air

Zhang, Sheng; Yun, Weigeng; Lin, Zhang

doi:10.1016/j.applthermaleng.2022.119256

Cited by 10 publications

(1 citation statement)

References 69 publications

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“…Since the clean air provided by natural ventilation is significantly affected by the number, size and position of openings, outdoor weather conditions, etc. (Zhang et al 2022d), mechanical ventilation is generally used to provide desired clean air for robust control of airborne infection risk (Stabile et al 2021;Zhang et al 2022c). When the capacity of the mechanical ventilation is sufficiently large, different ventilation strategies could be developed to deliver the desired clean air for airborne infection risk control while reducing the energy consumption of mechanical ventilation, e.g., the occupancy-density based ventilation method (Wang et al 2021), metabolism based ventilation method (Wang et al 2022), and equivalent fresh airflow rate based ventilation method (Guo et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Occupancy-aided ventilation for airborne infection risk control: Continuously or intermittently reduced occupancies?

2022

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Ventilation is an important engineering measure to control the airborne infection risk of acute respiratory diseases, e.g., Corona Virus Disease 2019 (COVID-19). Occupancy-aided ventilation methods can effectively improve the airborne infection risk control performance with a sacrifice of decreasing working productivity because of the reduced occupancy. This study evaluates the effectiveness of two occupancy-aided ventilation methods, i.e., the continuously reduced occupancy method and the intermittently reduced occupancy method. The continuously reduced occupancy method is determined by the steady equation of the mass conservation law of the indoor contaminant, and the intermittently reduced occupancy method is determined by a genetic algorithm-based optimization. A two-scenarios-based evaluation framework is developed, i.e., one with targeted airborne infection risk control performance (indicated by the mean rebreathed fraction) and the other with targeted working productivity (indicated by the accumulated occupancy). The results show that the improvement in the airborne infection risk control performance linearly and quadratically increases with the reduction in the working productivity for the continuously reduced occupancy method and the intermittently reduced occupancy method respectively. At a given targeted airborne infection risk control performance, the intermittently reduced occupancy method outperforms the continuously reduced occupancy method by improving the working productivity by up to 92%. At a given targeted working productivity, the intermittently reduced occupancy method outperforms the continuously reduced occupancy method by improving the airborne infection risk control performance by up to 38%.

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