Abstract
The basic source of information for determining the temperature distribution in the rock mass and thus the potential for thermal energy contained in geothermal water conversion to electricity, are: temperature measurements in stable geothermic conditions, temperature measurements in unstable conditions, measurements of maximum temperatures at the bottom of the well. Incorrect temperature estimation can lead to errors during thermodynamic parameters calculation and consequently economic viability of the project. The analysis was performed for the geothermal water temperature range of 86–100°C, for dry working fluid R245fa. As a result of the calculations, the data indicate an increase in geothermal power as the geothermal water temperature increases. At 86°C, the potential power is 817.48 kW, increases to 912.20 kW at 88°C and consequently to 1 493.34 kW at 100°C. These results are not surprising, but show a scale of error in assessing the potential that can result improper interpretation of the rock mass and geothermal waters temperature.
Highlights
Research of deep geothermal systems requires careful analysis of a number of key geological factors, where the quality of the data determining the reliability of the models [13]
In the case of thermodynamic analysis of heat accumulated in geothermal waters utilization [4,5], ex. using Organic Rankine Cycle (ORC), one of the key parameters is the temperature of geothermal waters determined by the thermal parameters of the rock mass
The calculations show that the geothermal water temperature is crucial for the thermal efficiency and power output
Summary
Research of deep geothermal systems requires careful analysis of a number of key geological factors, where the quality of the data determining the reliability of the models [13]. Using Organic Rankine Cycle (ORC), one of the key parameters is the temperature of geothermal waters determined by the thermal parameters of the rock mass. In the case of thermodynamic analysis of heat accumulated in geothermal waters utilization [4,5], ex. This is crucial in the context of correct estimation of power, efficiency and quantity of electricity. The paper presents the consequences of incorrect determination of the temperature of geothermal waters used in the ORC systems
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