Abstract
The paper presents the results of the development of a methodology for a comprehensive assessment of the system's efficiency, which includes solar collectors, a heat storage tank, a ground heat accumulator, and a building heating system. The model of non-stationary heat exchange makes it possible to determine the area and the number of solar collectors and the volume of a seasonal (ground) heat accumulator for various climatic conditions, types of solar engineering equipment, types of heating systems in the building, providing the necessary temperature characteristics of the building. We have obtained analytical expressions for a seasonal change in solar radiation and ambient temperatures typical for a sharply continental climate, and have made a numerical study of the time of use of the accumulated energy for a building with a heated area of 70 m 2 . For a 500 m 3 ground heat accumulator with a maximum heating temperature (90 °C), the stored energy is shown to be sufficient for heating the building with a warm floor system for more than 100 days. The paper submits the data confirming expediency of use of solar systems of heat supply with the ground heat accumulator for the severe climatic conditions characteristic of the Ural region of Russia. The use of ground heat accumulators is a simple and low-cost method of transferring solar energy in time (from summer to winter), which allows us to significantly reduce the cost of organic fuel for heating the premises during the heating season. The greatest efficiency of use of the energy accumulated in the ground is achieved when applying low temperature heating systems (underfloor heating, air heating). This technique is quite universal and can be used for any grounds and accumulative environments that differ from the natural ground by thermal physical characteristics (talcochlorite, talcomagnesite, salt compositions, etc.), as well as for other types of thermal loads, such as maintaining a favorable temperature regime in swimming pools and agricultural structures of enclosed soil.
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