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Modeling method of an active-passive ventilation wall with latent heat storage for evaluating its thermal properties in the solar greenhouse

Han, F; Chen, C; Hu, Q; He, Y; Wei, S; Li, C; (2021) Modeling method of an active-passive ventilation wall with latent heat storage for evaluating its thermal properties in the solar greenhouse. Energy and Buildings , 238 , Article 110840. 10.1016/j.enbuild.2021.110840. Green open access

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Abstract

Active-passive phase change heat storage technologies have been obtained extensive application to decrease greenhouse’s demands for fossil energy during off-seasons. To develop the utilization ratio of solar energy in solar greenhouses during winter, the active-passive ventilation wall with latent heat storage (APVW-L) was introduced and could be integrated into greenhouse’s back-wall. However, system design and operation parameters are subjected to numerous factors, including its structure, material performance and outdoor meteorological parameters. To achieve optimization in the energy performance of this system, this study used finite element analysis and lumped parameter analysis to establish coupled energy balance equations of the APVW-L and the air inside vertical air passages, and the cubic spline interpolation was used to calculate the continuous relationship between phase change material’s equivalent specific heat capacity and temperature. This modeling method of the APVW-L was accurately validated against the measured data, and then used in the optimization design and operation strategy of the APVW-L in the greenhouses. This study demonstrated that the optimized APVW-L could store 5.36 MJ/(m2·day) of solar energy in Beijing. Compared to the identical conventional greenhouses, after midnight, the experimental greenhouse having APVW-L increased the back-wall’s interior surface temperature by 2.2∼3.4 °C, and the average indoor air temperature by 0.8∼1.4 °C. This study provides methods for the APVW-L's optimization design and its operation strategy, even for the rationalization of the near-zero energy consumption of the solar greenhouse during winter.

Type: Article
Title: Modeling method of an active-passive ventilation wall with latent heat storage for evaluating its thermal properties in the solar greenhouse
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.enbuild.2021.110840
Publisher version: https://doi.org/10.1016/j.enbuild.2021.110840
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
URI: https://discovery.ucl.ac.uk/id/eprint/10123291
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