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This paper analyzes a greenhouse heating system using geothermal energy and storage tank and the possibility of utilization of insufficient amount of heat from geothermal sources during the periods with low outside air temperatures. Crucial for these analyses is modelling of the necessary yearly energy requirements for greenhouse heating. The results of these analyses enable calculation of an appropriate storage tank capacity so that the energy efficiency of greenhouse heating system with geothermal energy could be significantly improved.

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The Ph.D. dissertation presents the results of an investigation of the influence of the composition and temperature of geothermal water on the choice of the heat scheme and materials for the equipment for geotherma energy utilization. Depending on the specific yield of geothermal springs, its composition and temperature, the results of theoretical and experimental investigations enaЬle the following:1. An analysis of the potentials for utilization of geothermal water for heating; 2. Sampling of geothermal water and determination of its properties; З. The choice of materials for manufacturing the components of the system for geothermal energy utilization; 4. Determination of the parameters required for the design of heat exchangers. On the basis of experimental investigations carried out Ьу using the appropriate measuring equipment, it was possiЬle to determine the corrosion of meterials (carbon steeel, stainless steel and cast iron) and а change in overal fouling resistance caused Ьу geothermal water from the borehole of PIK "7 .juli"-Debrc. In this connection, it was determined as follows:• in the case of carbon steel and cast iron samples, the corrosion rate depends on the flow rate of geothermal water, wereby the corrosion rate in case of stationary water is very small; the corrosion rate increases significantly as the water flow rate of water increases (at the flow rates of water from 0,5 to 2 rn!s, it increases several times ); • in the case of stainless steel samples, no significiant difference in the corrosion rate was observed in the case of stationary water, as well as in the case og water flow; • during the 90-day investigation, а linear dependence of overal fouling resistance in time was determined. The overal heat transfer coefficient of testing heat exchanger declined from 1100 (W/m 2 K) at the beginning of the investigation to 650 (W/m 2 K) at its end.