Original scientific paper
https://doi.org/10.31306/s.67.3.3
Combined heat and power production from geothermal sources using simple split flow and advanced double stage Organic Rankine Cycle configurations
Nenad Mustapić
; Veleučilište u Karlovcu, Karlovac, Hrvatska
Toni Kralj
; Veleučilište u Karlovcu, Karlovac, Hrvatska
*
* Corresponding author.
Abstract
With the rise of energy needs and decentralization of power generation, and especially the need for energy production from renewable sources, the use of power plants based on organic Rankine cycle is becoming more and more significant. However, this type of power plant wastes a lot of available heat after preheating of the working fluid. Combined heat and power (CHP) production enables mitigating wasted heat potential and increasing the overall efficiency of the organic Rankine cycle-based power plant. The aim of this work is thermodynamic characteristics determination and their comparison, for two organic Rankine cycle configurations for combined heat and power: split flow simple organic Rankine cycle (SF SORC) and double stage organic Rankine cycle (DS ORC). Considered geothermal sources are low to medium temperature sources between 120°C and 180°C. The methodology includes thermodynamic analysis and optimization of the specified organic Rankine cycle configurations for heat and power production from geothermal sources. The obtained results show that the combined heat and power split flow simple organic Rankine cycle (CHP SF SORC) configuration is superior to the combined heat and power double stage organic Rankine cycle (CHP DS ORC) configuration, where plant (system) efficiency can be increased up to 28% for low temperature district heating, and for district heating plant (system) efficiency usually increases from about 12% to 18% depending on the working fluid and the temperature of the geothermal fluid. With regard to combined heat and power double stage organic Rankine cycle (CHP DS ORC) configuration plant (system) efficiency can be increased up to 18% for low temperature district heating, and for district heating plant (system) efficiency usually increases from 5% to 8%.
Keywords
Hrčak ID:
336142
URI
Publication date:
1.10.2025.
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