Abstract

In the work presented have been selected problems concerned with modelling of thermal-hydraulic systems of extraction and utilization of geothermal energy for the purpose of heating. With respect to temperature of extracted geothermal water and a value of return temperatule of municipal water, independently from the system of geothermal energy extraction, there are two kinds of installation solutions in the geothermal power station on the geothermal water side used, namely heat exchangers co-operating with peak-load boilers and heat exchangers with absorption heat pump and peak-load boilers. The first solution is used for higher temperatures of geothermal waters and the second one is used in the case of lower temperatures of extracted water. The applied solution depends also on the temperature of feeding and return municipal water, which directly results from applied design of district heating network, i.e. kind and way of connection of heat receivers. The method of assessment of the possibility of extraction and utilization of geothermal energy in selected district heating networks, where qualitative regulation is used in a parallel combination of two groups of heat receivers and implernentation of geothermal water heat exchangers has been also described. Presented methodology enables to conduct a comparative analysis of network designs with parallel connection of two different groups of heat receivers independently of applied systems of geothermal energy extraction. It can also be the basis for conducting economical analysis of comparable variants in both cases.