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High Efficient Geothermal Heat Pump and Ground Heat Exchangers

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H: Geo-Energy".

Deadline for manuscript submissions: closed (29 February 2020) | Viewed by 2767

Special Issue Editor


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Guest Editor
School of Civil, Environmental and Architectural Engineering, Korea University, Seongbuk-gu, Seoul, Korea
Interests: heat exchangers; heat exchange pipe; heat pump system; heating-cooling cycles; heat transfer

Special Issue Information

Dear colleagues,

Heat pump technology is one of the most sophisticated engineering achievements for heating, ventilation, and air conditioning (HVAC). The ground heat exchanger induces heat exchange with the ground formations by means of a heat carrier that circulates through closed pipes or open boreholes installed deep underground. The heat exchangers are connected with a ground heat pump system to save the energy consumption for heating and cooling buildings. For the past decades, emerging technology has promoted remarkable developments, which necessitates compiling each piece of state-of-the-art technology into this Special Issue that seeks to promote and disseminate knowledge on the various topics and technologies of ground heat pump systems and components. We invite comprehensive reviews and original research articles. Based on your expertise, you could make an excellent contribution to this Special Issue. Papers addressing, but not limited to, the following topics are recommended:

  • High-efficiency heat pump systems
  • Thermally driven heat pump/refrigeration
  • Heat and mass transfer enhancement
  • Innovative ground heat exchangers
  • Computational fluid dynamics/numerical experiments
  • Design/system optimization and dynamic control

Prof. Dr. Hangseok Choi
Guest Editor

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Keywords

  • geothermal heat pump
  • ground heat exchanger
  • heat transfer
  • heating-cooling cycle
  • COP

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Published Papers (1 paper)

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Research

18 pages, 4847 KiB  
Article
Numerical Investigation of the Effect of Nanoparticle Diameter and Sphericity on the Thermal Performance of Geothermal Heat Exchanger Using Nanofluid as Heat Transfer Fluid
by Ruiqing Du, Dandan Jiang and Yong Wang
Energies 2020, 13(7), 1653; https://doi.org/10.3390/en13071653 - 2 Apr 2020
Cited by 23 | Viewed by 2572
Abstract
The geothermal heat exchanger system is one of the most energy-efficient and environmentally friendly building service systems. In the present study, CuO/water nanofluid was used as the heat transfer fluid to enhance the energy efficiency of the geothermal heat exchangers. A three-dimensional numerical [...] Read more.
The geothermal heat exchanger system is one of the most energy-efficient and environmentally friendly building service systems. In the present study, CuO/water nanofluid was used as the heat transfer fluid to enhance the energy efficiency of the geothermal heat exchangers. A three-dimensional numerical model was employed to investigate the effect of nanoparticle diameter and sphericity on the thermal performance of the geothermal heat exchanger, and it was well validated against the experimental results of nanofluids in the geothermal heat exchangers. The numerical results showed that nanoparticles with a diameter of 5 nm and 50 nm were not recommended for the nanofluids used in the geothermal heat exchangers due to the performance efficiency coefficient lower than 1, and the optimum diameter was 40 nm, which had the highest performance efficiency coefficient (1.004875). Moreover, the spherical particle-based nanofluid was characterized by the 8.55% higher energy efficiency, in comparison to rod-shaped particle-based nanofluid. Therefore, the application of nanofluid in the geothermal heat exchanger can enhance heat transfer, and the proposed optimum particle diameter and sphericity could contribute to higher energy efficiency. Full article
(This article belongs to the Special Issue High Efficient Geothermal Heat Pump and Ground Heat Exchangers)
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