Comparison of space cooling/heating load under non-uniform indoor environment with convective heat gain/loss from envelo
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Comparison of space cooling/heating load under non-uniform indoor environment with convective heat gain/loss from envelope
Department of Building Science, Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Tsinghua University, Beijing, China
Abstract
Keywords
The indoor parameters are generally non-uniform distributed. Consequently, it is important to
cooling/heating load,
study the space cooling/heating load oriented to local requirements. Though the influence of
non-uniform environment,
indoor set point, heat sources, and ambient temperature of convective thermal boundary on
space cooling/heating,
cooling/heating load has been investigated in the uniform environment in previous research, the
temperature distribution,
influence of these factors, particularly the convective heat gain/loss through a building envelope, on cooling/heating load of non-uniform environment has not yet been investigated. Therefore, based on the explicit expression of indoor temperature under the convective boundary condition, the expression of space cooling/heating load with convective heat transfer from the building envelope is derived and compared through case studies. The results can be summarized as follows.
Research Article
Shuai Yan, Xianting Li ()
building envelope
Article History Received: 28 October 2019 Revised: 27 July 2020 Accepted: 06 August 2020
(1) The convective heat transferred through the building envelope is significantly related to the airflow patterns: the heating load in the case with ceiling supply air, where the supply air has a
© Tsinghua University Press and
smaller contribution to the local zone, is 24% higher than that in the case with bottom supply air.
Springer-Verlag GmbH Germany,
(2) The degree of influence from each thermal boundary to the local zone of space cooling cases is
part of Springer Nature 2020
close to that of a uniform environment, while the influence of each factor, particularly that of supply air, is non-uniformly distributed in space heating. (3) It is possible to enhance the influence of supply air and heat source with a reasonable airflow pattern to reduce the space heating load. In general, the findings of this study can be used to guide the energy savings of rooms with non-uniform environments for space cooling/heating.
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Introduction
E-mail: [email protected]
Building Thermal, Lighting, and Acoustics Modeling
The energy consumption of heating, ventilation, and air conditioning (HVAC) systems accounts for a large proportion of total building energy use (Pérez-Lombard et al. 2008). Specifically, it is reported that HVAC system typically constitutes 50% of the total building energy use (Kabanshi et al. 2018). In fact, the energy consumed by ventilation systems plays an important role in HVAC systems; therefore, they should be designed properly to save energy (Vakiloroaya et al. 2014). The consideration of indoor temperature and the quantification of cooling/heating load is fundamental to energy-efficient ventilation systems. Traditionall
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