Energy Analysis of a C02 Thermosiphon

Atrens, Aleks, Gurgenci, Hal and Rudolph, Victor (2009). Energy Analysis of a C02 Thermosiphon. In: Proceedings, Thirty-Fourth Workshop on Geothermal Reservoir Engineering. 34th Workshop on Geothermal Reservoir Engineering, Stanford University, CA, USA, (). February 9-11, 2009.

Author Atrens, Aleks
Gurgenci, Hal
Rudolph, Victor
Title of paper Energy Analysis of a C02 Thermosiphon
Formatted title
Energy Analysis of a C02 Thermosiphon
Conference name 34th Workshop on Geothermal Reservoir Engineering
Conference location Stanford University, CA, USA
Conference dates February 9-11, 2009
Proceedings title Proceedings, Thirty-Fourth Workshop on Geothermal Reservoir Engineering
Place of Publication Stanford, California, USA
Publisher not found
Publication Year 2009
Year available 2009
Sub-type Fully published paper
Open Access Status
Total pages 6
Collection year 2010
Language eng
Formatted Abstract/Summary
Engineered geothermal systems (EGS) present an opportunity to expand the implementation of geothermal power. There has been some interest in the possible application of CO2 as a heat extraction fluid in these systems instead of water, due to a variety of inherent benefits, including being a nonpolar fluid, low viscosity at the temperatures and pressures within the reservoir and a large buoyancy effect. The buoyancy effect in particular indicates the potential for a simple surface plant design, or “CO2 thermosiphon”. Balancing these advantages, CO2 has some drawbacks, leading to lower thermodynamic performance in the overall system. This is mostly due
to a combination of lower heat capacity, and large frictional losses due to gas-phase flows in the production wellbore. Here we explore some of the thermodynamics underlying this characteristic, and explore some scenarios that could be expected to offset it. Ultimately, economic analysis will be necessary to determine in what cases CO2 would be applicable as a geothermal heat extraction fluid. This should give some indication as to which geothermal resources may benefit from the usage of CO2.
Subjects 091399 Mechanical Engineering not elsewhere classified
970109 Expanding Knowledge in Engineering
Q-Index Code E1
Q-Index Status Provisional Code

Document type: Conference Paper
Collection: School of Mechanical & Mining Engineering Publications
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Created: Thu, 29 Apr 2010, 12:44:34 EST by Rose Clements on behalf of School of Mechanical and Mining Engineering