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The promotion effect of human activity intensity on displacement ventilation efficiency by the enhancement indoor thermal stratification

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Title: The promotion effect of human activity intensity on displacement ventilation efficiency by the enhancement indoor thermal stratification
Authors: Chenlong Zhao, Bingye Song, Chenghao Zhang, Ran Gao, Long He
Source: Case Studies in Thermal Engineering, Vol 61, Iss , Pp 104928- (2024)
Publisher Information: Elsevier, 2024.
Publication Year: 2024
Collection: LCC:Engineering (General). Civil engineering (General)
Subject Terms: Displacement ventilation, Human activity intensity, Thermal plume, Standing posture, Engineering (General). Civil engineering (General), TA1-2040
More Details: In a displacement ventilation system, the human body heat source plays a significant role and should not be overlooked. The intensity of human activity is a crucial factor in determining the amount of heat generated by the human body. In this work, the impact of thermal plumes generated by different levels of human activity intensity on the temperature stratification and ventilation efficiency in displacement ventilation system have been explored with experimental and numerical methods. The airflow patterns in the displacement air supply system under various levels of human activity intensity were simulated. The results show that under the same air supply speed, as the human activity intensity increasing from 125 W to 402 W, the phenomenon of temperature stratification becomes more pronounced. With the promotion of thermal plumes, the air flow velocity on the human body surface increases, leading to an enhancement in ventilation efficiency. Therefore, to elimination of the indoor thermal load, the air supply speed can be reasonably reduced according to the human activity intensity in the room, further enhancing the energy-saving effect of displacement ventilation.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2214-157X
Relation: http://www.sciencedirect.com/science/article/pii/S2214157X24009596; https://doaj.org/toc/2214-157X
DOI: 10.1016/j.csite.2024.104928
Access URL: https://doaj.org/article/e1d90862c40040a0aa031f9f24aede2c
Accession Number: edsdoj.1d90862c40040a0aa031f9f24aede2c
Database: Directory of Open Access Journals
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  Data: The promotion effect of human activity intensity on displacement ventilation efficiency by the enhancement indoor thermal stratification
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  Data: <searchLink fieldCode="AR" term="%22Chenlong+Zhao%22">Chenlong Zhao</searchLink><br /><searchLink fieldCode="AR" term="%22Bingye+Song%22">Bingye Song</searchLink><br /><searchLink fieldCode="AR" term="%22Chenghao+Zhang%22">Chenghao Zhang</searchLink><br /><searchLink fieldCode="AR" term="%22Ran+Gao%22">Ran Gao</searchLink><br /><searchLink fieldCode="AR" term="%22Long+He%22">Long He</searchLink>
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  Data: Case Studies in Thermal Engineering, Vol 61, Iss , Pp 104928- (2024)
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  Data: 2024
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  Data: LCC:Engineering (General). Civil engineering (General)
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  Data: <searchLink fieldCode="DE" term="%22Displacement+ventilation%22">Displacement ventilation</searchLink><br /><searchLink fieldCode="DE" term="%22Human+activity+intensity%22">Human activity intensity</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+plume%22">Thermal plume</searchLink><br /><searchLink fieldCode="DE" term="%22Standing+posture%22">Standing posture</searchLink><br /><searchLink fieldCode="DE" term="%22Engineering+%28General%29%2E+Civil+engineering+%28General%29%22">Engineering (General). Civil engineering (General)</searchLink><br /><searchLink fieldCode="DE" term="%22TA1-2040%22">TA1-2040</searchLink>
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  Data: In a displacement ventilation system, the human body heat source plays a significant role and should not be overlooked. The intensity of human activity is a crucial factor in determining the amount of heat generated by the human body. In this work, the impact of thermal plumes generated by different levels of human activity intensity on the temperature stratification and ventilation efficiency in displacement ventilation system have been explored with experimental and numerical methods. The airflow patterns in the displacement air supply system under various levels of human activity intensity were simulated. The results show that under the same air supply speed, as the human activity intensity increasing from 125 W to 402 W, the phenomenon of temperature stratification becomes more pronounced. With the promotion of thermal plumes, the air flow velocity on the human body surface increases, leading to an enhancement in ventilation efficiency. Therefore, to elimination of the indoor thermal load, the air supply speed can be reasonably reduced according to the human activity intensity in the room, further enhancing the energy-saving effect of displacement ventilation.
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      – Text: English
    Subjects:
      – SubjectFull: Displacement ventilation
        Type: general
      – SubjectFull: Human activity intensity
        Type: general
      – SubjectFull: Thermal plume
        Type: general
      – SubjectFull: Standing posture
        Type: general
      – SubjectFull: Engineering (General). Civil engineering (General)
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