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Mid-Term Conference - Potsdam, Germany
Mid-Term Conference - Potsdam, Germany
9-12 January 2007 GeoForschungsZentrum Potsdam
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Low temperature cycles – concepts and prospects
Low-enthalpy geothermal resources are typical finite heat capacity sources, 
while the environment which acts as heat sink may be regarded infinite. 
Therefore the temperature-enthalpy curves of heat source and heat sink have 
an almost triangular shape. Applicability, advantages and disadvantages of 
different ideal power cycles in such a setting, like the Carnot cycle, the Lorentz 
cycle and a cycle with triangular shape, are discussed.
Different optimisation criteria like thermal efficiency, power output and resource 
utilization may be applied to improve the design of the plants. Every criterion 
would result in a different design.
A couple of power plant concepts were developed to get close to the ideal 
cycle. The most prominent like the organic Rankine cycle (ORC) and the Kalina 
cycle will be presented, including suitable optimisation approaches. 
Cold production competes fairly well and will be addressed also. Since combined 
generation of heat and power, or heat, power and cooling, is expected to 
significantly improve the economics plant, promising methods of coupling of the 
processes will be discussed briefly.
Id: 62
Place: GeoForschungsZentrum Potsdam
14473 Potsdam
Room: Building H, Auditorium
Starting date:
11-Jan-2007   09:10
Duration: 20'
Primary Authors: Prof. ZIEGLER, Felix (Technische Universität Berlin)
Co-Authors: Dr. KöHLER, Silke (RWE Power AG)
Presenters: Prof. ZIEGLER, Felix
Material: slides Slides

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