EVALUATION OF UTILIZATION OF A GEOTHERMIC ENERGY IN HEAT AND HEAT-POWER PLANT

In the paper a concept of construction of a heat and heat-power plant supplied with heat from a geothermal heat exchanger has been presented. Considered system consists of two cooperating systems, i.e. a system of acquisition of geothermal energy in the form of a closed-loop underground heat exchanger and a system for utilization of geothermal energy such as a heat or heat-power plant operating according to low-temperature Clausius-Rankine cycle, where a substance with reduced boiling temperature has been used. Calculations have been accomplished for assumed data about the heat exchanger such as its dimensions, flow rate of circulating liquid, overall heat transfer coefficient, depth of the location of the horizontal part of the exchanger, which is related to temperature of surrounding rocks, which subsequently enabled determination of working fluid temperature leaving the exchanger and supplying the power plant. On that basis, using the appropriate analytical model and taking up indispensable assumptions about the system and conditions of its operation, determined was the amount of energy possible to be produced in the analysed plants.