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Among other renewable resources of energy, solar energy has a small but dynamically increasing share. Solar irradiance is characterized by large variability, especially in the 24-hour cycle. Therefore, machines that use solar energy work in transient states. The character of heat exchange for the plate solar collector and the heat exchanger working in the hybrid system was investigated. The character of heat exchange turned out to be oscillatory for both machines mentioned above. The investigations of the heat exchanger model in laboratory conditions have been carried out to analyse the observed phenomenon in detail. The investigations confirmed the previously observed oscillatory character of heat exchange. As this phenomenon is unfavourable, working out methods of process control to stabilize the operation of these machines is highly recommended.

The Character of Heat Exchange in the Element Powered by Renewable Energy