Effect of a dual-function solar collector integrated with building on the cooling load of building in summer

Abstract

As a building integrated solar thermal system, the dual-function solar collector integrated with building works for passive space heating in cold winter season, and for water heating in warm seasons. In this paper, the study is made on the dual-function solar collector integrated with building when it works in water heating mode with natural circulation. The coupled model of the collector and building's environment is established and validated. A numerical simulation is achieved to show the thermal effect of the novel system on the building in summer. By comparing with the cooling loads of the rooms with or without the novel collector in summer, the results show that when in summer, the novel solar system is available for serving hot water, and it does not have the summer overheating problem, and can even improve the thermal environment of its building slightly. dual-function solar collector integrated with building, passive space heating, water heating, natural circulation, cooling load, summer overheating Citation:Ji J, Luo C L, Sun W, et al. Effect of a dual-function solar collector integrated with building on the cooling load of building in summer.Globally, buildings are responsible for approximately 40% of the total world annual energy consumption. Most of this energy is for the provision of lighting, space heating/cooling, and water heating. Parallel to the worsening of energy related stress and environmental degradation issues in the world, much development and concern on building energy conservation has been promoted to use solar energy. Among all the applications in buildings, the applications of solar heat in buildings are some of the few mature solar technologies, relatively. Water heating and space heating are two of the primary ways for buildings to use solar energy for heating. In application of solar space heating in buildings, many characteristic systems have been developed [1][2][3][4][5]. Although these systems, comprising active systems and passive systems, have promoted the development of application of solar space heating, some specific problems remain to be solved, such as the problem that these systems are not *Corresponding author (email: jijie@ustc.edu.cn) available for use during the periods when there is no need for space heating and the problem of summer overheating. Water heating is one of the simplest applications of solar heat in buildings and one of the least expensive. However it still has some limitations which restrict its wider use, such as the problem that there are not always sufficient suitable and right oriented roof areas available for the installation of solar collectors and the problem of water-freezing in winter [6,7]. Therefore, a novel dual-function solar collector integrated with building has been proposed, and experimental study on it has been reported [8].In the present work, the numerical and experimental study on the novel system in water heating mode with natural circulation is made. A coupled simulation model for the collector and its correlation with buildi...

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