Energy Simulation of a Solar Thermal System for Domestic Hot Water and Space Heating
Journal Title: RECENT - Year 2013, Vol 14, Issue 40
Abstract
Analyzing the use opportunity of solar heating systems is based on factors such as necessary heat load, solar energy available to the location where it is implemented, auxiliary power capacity, cost of investment and its recovery time, etc. The energy saved in a solar-thermal installation due to solar energy use compared to a conventional thermal installation depends on the climatic conditions of the implementation site, the adopted scheme of installation as well as the solar collector dimensions. This paper proposes the use of a software of building energy simulation (TRNSYS) for modelling of a solar-thermal installations used both for providing hot water and space heating; in this way, it was achieved the energy simulations of a complex system of parallel use of renewable solar energy (solar thermal collectors) and the gas auxiliary source. TRNSYS software allowed the accurate establishing of thermal energy demand of the analyzed building, creating the link between weather data files and building, allowing the introduction of elements that affect indoor air properties (information on solar radiation and the incidence angle, relative humidity and air temperature, and also information on operating programs of the building); the operation modelling of the solar-thermal collectors within an installation, thus taking into account all heat exchange processes that occur during operation. The use of energy simulation programs from the design stage of solar-thermal installation leads to the possibility of identifying optimal solutions in terms of both energy consumption and the comfort parameters, allowing simulation of various scenarios for energy consumption. The use of computer simulations also enables operational behaviour analysis of solar collectors (as part of an installation) and transient analysis of characteristic parameters.
Authors and Affiliations
Elena EFTIMIE
Keywords
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