Criterion for the discharge of geothermal waste water into surface water sources in Hungary

Tonko, Csilla Maria

doi:10.1556/pollack.7.2012.2.12

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2021

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“…Many thermodynamics cycles are applicable in the temperature below 350 8C, like the CO 2 transcritical power cycle, Organic Rankine Cycle (ORC) and Trilateral Flash Cycle (TFC), instead of high-temperature steam Rankine Cycle (RC) [1,[3][4][5]. CO 2 has a low critical temperature, which makes it appropriate for utilizing a low heat sourcegeothermal [6,7]. CO 2 power cycles are widely used in air conditioning, heat pumps, refrigerating systems, and power cycles [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of high temperatures on the efficiency of sub-critical CO2 cycle

Ahmed

Imre

2021

Pollack

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Thermodynamic efficiency is a crucial factor of a power cycle. Most of the studies indicated that efficiency increases with increasing heat source temperature, regardless of heat source type. Although this assumption generally is right, when the heat source temperature is close to the critical temperature, increasing the heat source temperature can decrease efficiency. Therefore, in some cases, the increase in the source temperature, like using improved or more collectors for a solar heat source can have a double negative effect by decreasing efficiency while increasing the installation costs. In this paper, a comparison of the CO2 subcritical cycle and the Trilateral Flash Cycle will be presented to show the potential negative effect of heat source temperature increase.

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