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Heat Pipe Science and Technology, An International Journal

Published 4 issues per year

ISSN Print: 2151-7975

ISSN Online: 2151-7991

IMPROVEMENT OF OPERATION EFFECTIVENESS OF A CLOSED GEOTHERMAL HEAT EXCHANGER DUE TO IMPLEMENTATION OF ACTIVE INSULATION OF THE EXTRACTION ELEMENT

Volume 2, Issue 1-4, 2011, pp. 101-113
DOI: 10.1615/HeatPipeScieTech.v2.i1-4.110
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ABSTRACT

The idea of construction of the so-called underground closed geothermal heat exchanger presents an interesting concept of energy extraction from the resources contained in the Earth's crust. Such exchanger consists of a system of pipelines founded at a significant depth through which liquid is pumped, extracting energy from surrounding rocks and transporting heat to the Earth's surface. From the accomplished analyses, it results that the least efficient element from the efficiency point of view is the vertical part of such heat exchanger. As a result, significant reduction of temperature of the energy carrier fluid at the outflow is observed, leading to reduction of the overall efficiency of the heat exchanger. Bearing in mind that application of the passive insulation in the extraction part of the exchanger is technically difficult, the authors proposed the concept of the active insulation. The idea is based on the formation in the extraction part of two concentrically positioned channels, namely the inner circular channel, through which the principal flow rate of fluid flows and the external annular channel, where part of liquid flows serving as insulation layer. In the paper, we briefly present the calculation model with the active insulation enabling determination of the influence of the liquid flow rate in the external insulation channel on temperature distribution of the basic flow rate of the heat carrier flowing in the inner channel. That enabled conduction of the assessment of the influence of application of the active insulation on the improvement of the efficiency of operation of the entire geothermal heat exchanger.

CITED BY
  1. Vasiliev L. L., Solovei V. V., Kharlampidi D. Kh., Stachel A. A., Kujawa T., Tarasova V. A., Zhuravlev A. S., Tsitovich A. P., Kostenko E. V., Physical Processes and Technical Means for Using the Thermal Energy of Alternative Sources, Journal of Engineering Physics and Thermophysics, 88, 5, 2015. Crossref

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