Title of article :
Comparison of thermodynamic cycles for power production from low-temperature geothermal heat sources
Author/Authors :
Walraven، نويسنده , , Daniël and Laenen، نويسنده , , Ben and D’haeseleer، نويسنده , , William، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
14
From page :
220
To page :
233
Abstract :
The performance of different types of organic Rankine cycles (ORCs) and of the Kalina cycle is investigated and optimized for low-temperature (100–150 °C) geothermal heat sources. A variety of configurations is worth considering. The ORCs can be subcritical or transcritical and can have one or more pressure levels. Each cycle can be a simple one, have recuperation or turbine bleeding and up to 80 different working fluids can be used. Comparison of these cycles to each other and to an optimized Kalina cycle concludes that the transcritical and multi-pressure subcritical cycles are the best ones. Exergetic plant efficiencies of above 50% can be achieved when the brine is allowed to cool down as much as possible. A constraint on the brine outlet temperature causes a strong decrease in the mechanical power output of the cycle. Due to the low heat source temperatures, a low condenser temperature and small temperature differences in the heat exchanger are very important.
Keywords :
Geothermal , Binary cycle , ORC , Kalina
Journal title :
Energy Conversion and Management
Serial Year :
2013
Journal title :
Energy Conversion and Management
Record number :
2336563
Link To Document :
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