TITLE

Foundation heat exchangers for residential ground source heat pump systems�Numerical modeling and experimental validation

AUTHOR(S)
Xing, Lu; Cullin, James R.; Spitler, Jeffrey D.; Im, Piljae; Fisher, Daniel E.
PUB. DATE
December 2011
SOURCE
HVAC&R Research;Dec2011, Vol. 17 Issue 6, p1059
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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. The numerical model is a two-dimensional finite-volume model that considers a wide variety of factors, such as soil freezing and evapotranspiration. The FHX numerical model is validated with one year of experimental data collected at an experimental house located near Oak Ridge, Tennessee. The model shows good agreement with the experimental data�heat pump entering fluid temperatures typically within 1�C (1.8�F)�with minor discrepancies due to approximations, such as constant moisture content throughout the year, uniform evapotranspiration over the seasons, and lack of ground shading in the model.
ACCESSION #
69537762

 

Related Articles

  • 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...

  • Experimental validation of a ground heat exchanger model in a hybrid ground source heat pump. Pertzborn, Amanda; Hackel, Scott; Nellis, Greg; Klein, Sanford // HVAC&R Research;Dec2011, Vol. 17 Issue 6, p1101 

    This article provides an overview of short time-scale validation of the duct storage model (Hellstr�m 1989) for the simulation of ground source heat pump performance using experimental data acquired from two operational systems. The error in the temperature change across the ground heat...

  • Do this, do that. Siegenthaler, John // Plumbing & Mechanical;Dec2012, Vol. 30 Issue 10, p10 

    The article discusses how to install a geothermal water-to-water heat pump system. During heating, the water temperature in the middle of the buffer tank is monitored by a standard outdoor reset controller, which operates the heat pump. It is stated that one should make sure that all piping that...

  • Comparative Heat Transfer Efficiency Study of Coaxial and U-loop Boreholes. Jun Wang // GSTF Journal of Engineering Technology;Apr2014, Vol. 2 Issue 4, p1 

    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...

  • 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.

  • 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