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Research Article

Experimental study on the CO2 concentration and age of air distribution inside tiny sleeping spaces

Jingying Zhang,§, Yanyan Li,§, Haiguo Yin( ), Linfeng Liang, Songmei Zu, Le Gao, Ying Zhang, Angui Li
School of Building Services Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China

§ Jingying Zhang and Yanyan Li contributed equally to this work.

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Abstract

In recent years, rapid urban development has led to capsule hotels, sleep pods, and other tiny sleeping spaces that adapt to people’s fast-paced lives, achieving maximum functionality with a very small footprint. However, due to the small space, human metabolic pollutant (such as CO2) is more likely to accumulate, and the air is not easily circulated. In this paper, a full-size experimental platform is set up with three types of ventilation modes to explore the exclusion efficiency of metabolic pollutants and the overall distribution of age of air under these ventilation modes. The conclusions showed that the mean values of metabolic pollutant exclusion rates for the different ventilation modalities varied very little across the spatial dimensions of the confined space but varied considerably in the area around the head. The double-side attached ventilation method was the most effective in removing human metabolic pollutants, especially in the head region (CN ≥ 0.92), while the single-wall attached ventilation method had the best air exchange efficiency (η ≥ 0.85). This suggests an inconsistent distribution of CO2 and age of air, which is contrary to general common sense. The conclusions of this paper can guide the design of ventilation for tiny sleeping spaces.

Keywords

indoor air qualityattached ventilation modehuman metabolic pollutantair exchange efficiencytiny sleeping spaces

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Building Simulation
Volume 17 Issue 4,
April 2024
Pages 591-605
DOI: 10.1007/s12273-024-1101-1
Cite this article:
Zhang J, Li Y, Yin H, et al. Experimental study on the CO2 concentration and age of air distribution inside tiny sleeping spaces. Building Simulation, 2024, 17(4): 591-605. https://doi.org/10.1007/s12273-024-1101-1

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Received: 29 August 2023
Revised: 26 November 2023
Accepted: 06 December 2023
Published: 19 February 2024
© Tsinghua University Press 2024
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