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Utilisation of geothermal energy for supplying CHPs

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Nowak W. , Kaczmarek R.

Archives of Thermodynamics

2007

tom Vol. 28, no. 4

3-18

On the basis of the results obtained up to date on thermal-hydraulics of geothermal power plants it becomes apparent that the kind of applied fluid and temperature in evaporator are critical parameters in obtaining highest amounts of electricity from the same amount of geothermal energy. In calculations it has been assumed that the working fluid is an organic substance and the power plant is supplied with energy acquired from the underground geothermal closed heat exchanger (PZGWC), which has known thermal characteristics. As a result of conducted research a relatively small effectiveness of utilization of geothermal energy has also been concluded, which is a finding irrespective of the type of applied organic fluid. The latter is related to a. small drop of temperature in the installation of geothermal power plant. In order to reduce temperature of working fluid and at the same time increasing the effectiveness of utilisation of geothermal energy the power plant ought to be replaced with a combined heat and power plant (CHP). In relation to that, in the present paper presented have been the results of thermal-hydraulic calculations of both such installations supplied from PZGWC together with the results of calculations using the same type of organic substance as a working substance. In order to com-pare the combined heat and power plant with a geothermal power plant, in both cases same organic substance has been used in considered cycles. That enabled performing of the assessment on the effectiveness of energy utilisation. Analysed was a system where electricity solely was produced and another one, where combined production of electricity and heat for heating purposes was present. From the performed calculations it results that higher efficiency and effectiveness are attained in the case of the heat and power plant, in comparison to the power plant from the same level of geothermal energy.