The effects of ground heat exchanger parameters changes on geothermal heat pump performance – A review

Noorollahi, Younes; Saeidi, Reza; Mohammadi, Mohammad; Amiri, Ali; Hosseinzadeh, Mehdi

doi:10.1016/j.applthermaleng.2017.10.111

Cited by 128 publications

(35 citation statements)

References 114 publications

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“…[15] performed GAHX CFD on different pipe paths, however, it did not include pipe shape. Zhao et al [16] and Noorollahi et al [17] have studied parametric design of GAHX, Agrawal et al [18,19] discussed recent research trends on GAHX and GAHX effect on climate and soil conditions. Mahdavi et al [20] evaluated photovoltaic-thermal(PVT)-GAHX system's potential.…”

Section: Introductionmentioning

confidence: 99%

Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application

et al. 2019

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Ground-air heat exchangers have become an important topic in recent years due to their contributions to the market growth of the ground source heat pump industry. This paper provides a comprehensive study and recommends suggestions on the selection process of a suitable pipe for an air-to-water heat pump (AWHP). Parametric studies including material, turbulent plate quantity, and pipe type were performed to identify an optimal pipe design for high-performance AWHP. Both numerical and experimental studies were carried out to validate current pipe models. Overall, there was good agreement between the numerical model and experimental results. It was determined that a spirally corrugated pipe exhibited excellent thermal power generation with little compromising pressure drop. Finally, a pipe selection example was demonstrated as a design guideline to size an optimal pipe for AWHP application.

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Section: Introductionmentioning

confidence: 99%

Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application

et al. 2019

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“…GHPS may enhance its performance when a geothermal heat exchanger is buried in thermally enhanced materials. Noorollahi et al (2018) concluded that an increase in the thermal conductivity of the backfill material can reduce the length of the geothermal heat exchanger (GHE). These installations commonly use a mixture of concrete, clay, lime, cement, and sand with high thermal conductivity as backfill material in the boreholes.…”

Section: Introductionmentioning

confidence: 99%

Predicting the thermal behaviour of sands considering its moisture content and grain size with applications to geothermal heat pump installations

Rodríguez

Morillón-Gálvez

Aldama-Ávalos

et al. 2019

Energy and Buildings

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights  An experimental thermal study of five different types of sands has been conducted  Fine-grained sands attain higher maximum temperature than coarse-grained sands  Sub-angular and rounded grains with 0-25% moisture could enhance GHPS performance  Derivation of a sand temperature model considering grain size, shape and moisture content  Potential implementation of the derived model in building simulation tools is discussed

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“…Zhao et al [28] studied effective methods for increasing the heat transfer of GHEs, mainly via a summary of advances in phase change materials (PCMs). Noorollahi et al [29] investigated important parameters for the operation of GHEs. They provide some explanations about conventional backfill materials, and suggest that PCMs should be used to improve the performance of GHEs.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review of Backfill Materials and Their Effects on Ground Heat Exchanger Performance

et al. 2018

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Geothermal energy systems can help in achieving an environmentally friendly and more efficient energy utilization, as well as enhanced power generation and building heating/cooling, thereby making energy systems more sustainable. The role of the backfill material, which fills the space between a pipe and the surrounding soil, is important in the operation of ground heat exchangers. Among the review articles on parameters affecting ground heat exchanger performance published over the past eight years, only two discuss types of backfill materials, even though the importance of these materials is significant. However, no review has yet been published exclusively on the kinds of backfill materials used in ground heat exchangers. This article addresses this need by providing a comprehensive review of a variety of types of backfill materials and their effects on ground heat exchanger performance. For organizational purposes, the backfill materials are divided into two categories: conventional backfill materials (pure and mixed materials) and modern backfill materials (improved phase change materials). Both categories are described in detail. It is shown that bentonite has been used considerably as a conventional backfill material in ground heat exchangers, followed by silica sand and coarse/fine sand. Moreover, acid and shape-stabilized phase change materials have been applied mostly as modern backfill materials in ground heat exchangers. It is observed, generally, that conventional backfill materials are used more than modern backfill materials in ground heat exchangers. It should be noted that the data covered in this study are not from all the articles published in the last eight years, but rather from a subset based on specific criteria (i.e., English-language papers published in reputable journals). These articles were published by authors from numerous countries. The results may, as a consequence, have some corresponding limitations, but these are likely to be minor.

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The effects of ground heat exchanger parameters changes on geothermal heat pump performance – A review

Cited by 128 publications

References 114 publications

Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application

Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application

Predicting the thermal behaviour of sands considering its moisture content and grain size with applications to geothermal heat pump installations

A Comprehensive Review of Backfill Materials and Their Effects on Ground Heat Exchanger Performance

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