Redko A. Research study of improvement methods for geothermal heat supply systems

Thermoeconomic calculation and optimization models for the parameters of geothermal heat supply systems is researched. Hydraulic conditions of two-phase fluid flow in vertical wells under air-lift operation are subject of numerical and experimental analysis. The paper presents the technology of geothermal energy transformation which lies in injection of easy-boiling liquid into a production well, further separation and compression in a compressor, condensation under higher temperature level in comparison to the temperature of formation liquid. The line of study and production of a multi-stage circuit of HPU with condensation temperature of working liquid of 90-95 С is under development. Thermodynamic effectiveness of cycles and optimization of cascade HPU parameters are calculated. Flow diagrams of binary and hybrid power plants with a cascade cycle are presented, numerical investigations and optimization of cycles parameters are fulfilled.