engleski

A study of solar heating and radiative cooling of water

In this paper, the analysis of flat-plate solar collectors and radiative panels operation using average hourly weather data for a maritime climate region was performed. The panels were integrated in the space-ventilation system with air-conditioning by means of a water coil. Their primary function was to prepare sufficient quantity of cold water, integrating radiative and convective cooling, that was collected in the cold-water tank during the nighttime operation. That cold water was used for cooling of the air during daytime. On the other hand, solar collectors were used to produce the hot water that is collected in a separate tank. A simulation model for the parametric analysis of the system and the influence of its components on the system’ s operation was developed. The model includes the control of the system’ s operation, which prevents water circulation in the periods without cooling/heating contributions. The purpose of the research was to predict the system behaviour in Irish climatic conditions, to enable sizing and design of the test rig that is to be built for experimental validation as part of a current large research project. The results were presented in the appropriate charts, where the influence of the main parameters on the system’ s operation was illustrated. The results showed that the system covers full cooling energy demands during summer and a significant proportion of the hot water heating requirements in the daytime operation.

radiative panels; solar collectors; water cooling

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