Simulation of a geothermal heat pump system with an expander-driven primary pump

Hiroshi Asanuma, Koji Ono, Hiroaki Niitsuma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the authors examined feasibility of a GSHP which uses energy from expander to drive primary (ground side) pump by a simulation (see Fig. 1). The simulator has ability to represent convectional and diffusion heat transfer in soil. It also can simulate as well as dynamic behavior of refrigerant cycle. It has been revealed from this study that the formation temperature falls drastically in the initial phase of the operation and system performance (COP) is reduced afterwards for a low flow rate by single expander-driven pump. The performance of system has been evaluated for a two primary pump system, where one pump is driven by power output from the expander and the other is by external electricity. We have found that there exists optimum capacity ratio of expander and pump for most effective use of the energy from the expander. It has been also demonstrated that overall electrical power consumption can be reduced a few percentage using this system, although further investigation on more detailed system design and operation style should be made.

Original languageEnglish
Title of host publicationGeothermal Resources Council Annual Meeting 2009, Geothermal 2009
Pages492-494
Number of pages3
Publication statusPublished - 2009 Dec 1
EventGeothermal Resources Council Annual Meeting 2009, Geothermal 2009 - Reno, NV, United States
Duration: 2009 Oct 42009 Oct 7

Publication series

NameTransactions - Geothermal Resources Council
Volume33
ISSN (Print)0193-5933

Other

OtherGeothermal Resources Council Annual Meeting 2009, Geothermal 2009
CountryUnited States
CityReno, NV
Period09/10/409/10/7

Keywords

  • CSHP
  • Efficiency
  • Expander

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Geophysics

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