TITLE

Comparative Heat Transfer Efficiency Study of Coaxial and U-loop Boreholes

AUTHOR(S)
Jun Wang
PUB. DATE
April 2014
SOURCE
GSTF Journal of Engineering Technology;Apr2014, Vol. 2 Issue 4, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This paper presents the results of comparative heat transfer efficiency study based on in situ full scale tests conducted on conventional U-loop borehole heat exchangers (BHE) and a coaxial BHE. The results show that the coaxial BHE has considerably higher heat transfer efficiency, while consuming less pumping power than the U-loop's. The implication of a high efficiency BHE on reducing borehole loop length and initial investment cost is also discussed. It is concluded that the higher efficiency coaxial BHE has the potential to reduce borehole length 30% to 50%.
ACCESSION #
96167264

 

Related Articles

  • Introduction of a Thermal Response Test (TRT) Apparatus Used for Measuring Underground Heat Exchanger Characteristics. Yi LIU; Yang SHI; Ya-ning ZHANG // Advanced Materials Research;2014, Issue 937, p381 

    A thermal response test (TRT) apparatus is introduced in this paper for determination of the performance of underground heat exchanger in ground-source heat pump system. The inlet and outlet temperatures of the underground heat exchanger can be real-time tested to obtain the heat transfer data....

  • Improving accuracy and flexibility of numerical simulation of geothermal heat pump systems using Voronoi grid refinement approach. Kim, Seong-Kyun; Bae, Gwang-Ok; Lee, Kang-Kun // Geosciences Journal;Sep2015, Vol. 19 Issue 3, p527 

    We have developed a method and computational algorithms for implementing the method, which can generate unstructured Voronoi grids for its use in TOUGH2 simulations of geothermal heat pump systems. An adaptive gridding technique, known as Voronoi tessellation, not only is flexible to include...

  • GSHP DESIGN: DESIGN METHODS, CALCULATIONS, SOFTWARE DEMO. Sanner, Burkhard // Journal of Sustainable Energy;Jun2012, Vol. 3 Issue 2, p1 

    Design of borehole heat exchangers using tables or graphs for small systems are presented as well as software for larger installations. For the software EED, an example with validation of this software is given.

  • Analysis and thermal response test for vertical ground heat exchanger with two U-loop configuration. Chang, Keun Sun; Kim, Min Jun // International Journal of Energy Research;Feb2016, Vol. 40 Issue 2, p189 

    An in situ thermal response test (TRT) is applied to evaluate the thermal performance of the vertical ground heat exchanger (GHX) with two U-loop configuration. A line source method is used to derive the thermal conductivity and borehole thermal resistance from the measured data. Analyses are...

  • Multipole method to calculate borehole thermal resistances in a borehole heat exchanger. Claesson, Johan; Hellstr�m, G�ran // HVAC&R Research;Dec2011, Vol. 17 Issue 6, p895 

    Ground-source heat pump systems use borehole heat exchangers to transfer heat to and from the ground. An important feature is the local thermal resistances between the heat carrier flow channels in the borehole and the surrounding ground. The counter-flow heat exchange between the pipes is also...

  • Performance Analysis of Standing Column Well Ground Heat Exchanger Systems. Deng O'Neill, Zheng; Spitler, Jeffrey D.; Rees, Simon J. // ASHRAE Transactions;2006, Vol. 112 Issue 2, p633 

    Simulation studies are presented to examine the thermal and economic performance of standing column wells with and without groundwater bleed in different locations in the United States. The simulations are based on a simplified standing column well model that has been integrated into an hourly...

  • Foundation heat exchangers for residential ground source heat pump systems�Numerical modeling and experimental validation. Xing, Lu; Cullin, James R.; Spitler, Jeffrey D.; Im, Piljae; Fisher, Daniel E. // HVAC&R Research;Dec2011, Vol. 17 Issue 6, p1059 

    A new type of ground heat exchanger that utilizes the excavation often made for basements or foundations has been proposed as an alternative to conventional ground heat exchangers. This article describes a numerical model that can be used to size these foundation heat exchanger (FHX) systems....

  • Geothermal System Saves Money, Improves Comfort. Turpin, Joanna R. // Air Conditioning, Heating & Refrigeration News;8/23/2004, Vol. 222 Issue 17, p21 

    Discusses the features ClimateMaster Inc.'s Tranquility Series geothermal heating and cooling system in the United States. Heat exchangers, compressors and motors of the system; Energy efficiency rating; Longer life expectancy; Better indoor air quality.

  • Ground Source Heat Pumps In Texas School District. KAVANAUGH, STEVE // ASHRAE Journal;Oct2014, Vol. 56 Issue 10, p34 

    The article discusses the ground source heat pump (GSHP) technology at the Leander Independent School District (LISD) in Austin, Texas. It mentions the project's 2010 Energy Star rating based on measurable outcomes including longer ground heat exchangers, backfill material specifications and...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics