Experimental and numerical study of the airflow and thermal characteristic of non-uniform transpired solar collector
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Experimental and numerical study of the airflow and thermal characteristic of non-uniform transpired solar collector
1. State Key Laboratory of Green Building in Western China, Xi'an University of Architecture and Technology, Xi'an 710055, China 2. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract
Keywords
A transpired solar-collector is a device, which is attached to building walls, that uses solar energy to provide preheated fresh outdoor-air before it is drawn into the building through the ventilation system. A transpired collector consists of a heat-collection plate with infiltration holes, an air layer, an air outlet, and other auxiliary components. A transpired solar collector with non-uniform holes is investigated in this paper, and a physical model for it is developed. The model is then simplified to enable effective simulation and subsequently verified by experiments to evaluate the reliability of the simulation results. Furthermore, a multi-factor sensitivity analysis of a transpired solar collector, with respect to airflow and thermal characteristics, is performed using a numerical simulation. In addition, the application of the device is combined with the thermal requirements of the actual building. The results show that the air-layer thickness has the strongest effect on the heat-collection efficiency, which can be increased to 93% when thickness is 30 mm and height ratio is 0.30. This effect is obvious only in the case of non-uniform perforation. Although a high air-velocity can increase the daily heat-exchange by 595.2 W, the average daily air-supply temperature decreases by 34.2 °C. Even though the temperature-target may not be reached when more fresh air is introduced, the reduction of the fresh air heating-load is substantial.
non-uniform transpired solar collector,
1
Introduction
E-mail: [email protected]
airflow and thermal characteristics, experiment, numerical simulation
Article History Received: 21 October 2019 Revised: 02 March 2020 Accepted: 07 March 2020 © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Odysseus in 1967 (Torcellini and Pless 2004; Safer et al. 2005; Chen 2010). The research of this kind of solar wall mainly focused on the different types of venetian-blind-base designs (He et al. 2016; Chen et al. 2016), heat-pipe solar walls (Zhang et al. 2006), and lattice solar walls (Wang et al. 2013). In addition to related improvement- and extensionresearch, Liu et al. (2018) used phase-change materials at different locations in the new ventilated Trombe wall. This improved the thermal performance of the wall, alleviated overheating-problems during the day, and increased the heat-storage capabilities at night. Helenice et al. (2011) combined the Trombe wall with glass to improve the curtain wall system performance. The results show that a Trombe wall, with double self-cleaning glass, can reduce the energy consumption significantly. Choudhary et al.
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