Abstract
The instability of solar energy and its resource distribution characteristics make it difficult to judge its suitability in practical engineering applications, which hinders its promotion and application. In order to better promote the effective use of solar energy and promote the solar heating system, it is necessary to put forward a simple method of judging the suitability of the solar heating system for engineering application. This study puts forward “F, Q” as the basis for judging the suitability of solar heating systems built on the roof. Two types of public buildings, office buildings and three-star hotels, are taken as the research objects. DeST software is used to change the heating area of the building by superimposing floors to simulate the heat load of the building when the heating area changes. A dynamic simulation coupling model of solar heating system is established in the TRNSYS software to analyze the operating status of the system under all working conditions. The functional relationship between “F, Q” and solar energy guarantee rate is established, and the solar energy contribution rate is divided into three regions of F < 30%, 30% ≤ F ≤ 50%, and F > 50%. The evaluation standard of the building suitability of the solar energy heating system is established according to the scope of “F, Q” in different regions (An office building for, e.g., if the contribution rate of solar heating system is required to be greater than 50%, the “F” of these four areas should be greater than 0.11388, 0.15543, 0.10572, and 0.04511.), and the effectiveness of “F” is verified through actual cases verified by other scholars in the research. The method proposed in this paper is helpful to judge the suitability of solar heating systems in different regions and different types of conventional buildings, so as to better promote solar heating systems.
Highlights
With the population growth and economic development, the global energy consumption is rapidly growing in recent decades
Take the office building in Xi’an as an example, when F < 0.05467, it can be judged that the solar energy contribution rate of the building is less than 30%; when 0.05467 ≤ F ≤ 0.15543, it can be judged that the solar energy contribution rate of the building is within the range of 30%~50%; when F > 0.15543, it can be judged that the solar energy contribution rate of the building is greater than 50%
The building model is established by DeST software, and the dynamic simulation model of solar heating system is established by TRNSYS software
Summary
With the population growth and economic development, the global energy consumption is rapidly growing in recent decades. The fossil energy brings great progress to industrial development, and brings more and more serious environmental and climate problems [4]. In the context of low carbon, energy has become an issue of global consensus, how to ensure energy security and achieve the goal of “carbon peak, carbon neutralization” is the main problem the world faces. Energy saving and emission reduction in the field of buildings is the key to achieve the goal of carbon peak and carbon neutralization. More and more attention has been paid to how to develop and utilize renewable energy in the field of architecture. As a well-known form of solar thermal application, solar water-heating system accounts for 80% of the world’s solar thermal utilization [5]. Martinopoulos et al [6]
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