Assessment of electricity generation using medium temperature geothermal resources in Greece

Abstract

This paper deals with a parametric investigation of two binary cycles that can be used for the exploitation medium temperature geothermal resources in Northern Greece. In order to perform such an investigation, models have been developed for a small KALINA (KCS34) power plant and for an Organic Rankine Cycle (ORC) one. The modelling was carried out using the Aspen Plus software. The models have been successfully validated with experimental data from two small commercial plants. The validated models were used to parametrically study plant performance for a typical range of climatic and geothermal conditions in a Greek geothermal field. The main parameters considered are the geothermal fluid temperature, ranging from 90 to 120 ºC and the return temperature of the brine, which is assumed to be in the range of 70 - 80 ºC.