Horizontal and compact ground heat exchangers

Rees, Simon

doi:10.1016/b978-0-08-100311-4.00005-4

Cited by 8 publications

(7 citation statements)

References 41 publications

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“…The application of the GHP system for space heating and cooling has been improved in recent years, it is predicted that this trend will carry on in the next decades [21,22]. Notably, the geothermal energy is less influenced by weather condition than other renewable energies like wind and solar [23].…”

Section: Introductionmentioning

confidence: 99%

Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

Cui

Zhu

Twaha

et al. 2019

Energy Conversion and Management

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Geothermal heat pump has been widely recognized as one of the promising technologies for building applications because of its high energy efficiency and low operating expense, however the high capital investment and installation costs discourage building owners to choose such a system. The horizontal geothermal heat pump system with reduced cost is a viable option that would be utilized widely, the aim of this paper is to catalogue and critique a range of effective approaches for the horizontal geothermal heat pump systems in different regions based on techno-economic assessment data. A ground heat exchanger is a vital component of the horizontal geothermal heat pump. The state-of-the-art analytical and numerical models of the linear-loop, slinky-coil and spiral-coil ground heat exchangers are generalized, in addition to their advantages and disadvantages. A large number of economic evaluation methods for analysing the financial performance of the horizontal geothermal heat pump system are presented. At the end, the standpoints, recommendations and potential future study on the horizontal geothermal heat pump system are deliberated.

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Section: Introductionmentioning

confidence: 99%

Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

Cui

Zhu

Twaha

et al. 2019

Energy Conversion and Management

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“…Ground heat exchangers (GHE) are outstanding heating systems and have been used for a number of years in the USA, Europe, Turkey, and Japan (Florides and Kalogirou, 2007;Tarnawski et al, 2009;Esen and Yuksel, 2013;Sarbu and Sebarchievici, 2014;Dehghan B., 2017;Stylianou et al, 2017). Shallow horizontal forms of ground heat exchangers (HGHE) offer lower complexity and economic advantages compared to vertical designs and, although more land area may be required to meet a given heat exchange requirement, they continue to be an appealing technology for residential and smaller non-residential applications with a low temperature requirements of 35 to 70℃ (Wong B., Snijders A., 2006;Chiasson, 2010;Garcia Gonzalez et al, 2012;Simms, Haslam and Craig, 2014;Go et al, 2015;Kupiec, Larwa and Gwadera, 2015;Yoon, Lee and Go, 2015;Rees, 2016;Wei et al, 2017). A HTF (heat transfer fluid) is circulated through buried heat exchanging pipes to extract the stored heat from the soil storage upon requirement.…”

Section: 1 Backgroundmentioning

confidence: 99%

“…Various studies and reviews have been conducted on the design, testing, optimisation, and simulation of GHEs although most researchers focused on monitoring GHEs coupled with ground source heat pumps (GSHP) to maintain steady and comfortable indoor temperatures (Ball, Fischer and Hodgett, 1983;Leong, Tarnawski and Aittomäki, 1998;Hepbasli, Akdemir and Hancioglu, 2003;İnallı and Esen, 2004;Florides and Kalogirou, 2007;Gan, Riffat and Chong, 2007;Cui, Yang and Fang, 2008;Koyun, Demir and Torun, 2009;Esen, Inalli and Esen, 2009;Wu et al, 2010;Garcia Gonzalez et al, 2012;Garber, Choudhary and Soga, 2013;Sarbu and Sebarchievici, 2014;Sivasakthivel, Murugesan and Thomas, 2014;Bertermann, Klug and Morper-busch, 2015;Naylor, Ellett and Gustin, 2015;Esen and Turgut, 2015;Kim et al, 2016aKim et al, , 2016bLuo et al, 2016;Esen, Esen and Ozsolak, 2016;Stylianou et al, 2017;Wei et al, 2017). Although there is a need to be able to calculate HGHE performance, there has been less progress in developing validated models, and consequently design methods remain relatively simplified with design data tables and charts often being used in practice (Rees, 2016). Experimental work on HGHEs has included Esen and Yuksel (2013) investigating heating a greenhouse in Turkey's climate conditions using biogas, solar and ground energy and concluding that the ground can be successfully used for greenhouse heating purposes.…”

Section: 1 Backgroundmentioning

confidence: 99%

“…Recent research into solar assisted HGHE systems has mostly been devoted to optimising and improving the performance of systems by the addition of GSHP's, with much less focus on the backfill media used for storage and the air temperature fluctuations caused by the proximity of HGHEs to the ground surface (Hepbasli, Akdemir and Hancioglu, 2003;Li et al, 2006;Hu et al, 2013;Shang, Dong and Li, 2014). Careful attention has to be paid to the use of backfilling materials and installation procedures to ensure there is good contact between the pipe and the ground in the finished heat exchanger (Rees, 2016). There is an increased awareness that landfills are overfilling and that recycling waste is important (Lund, 2010;Esen and Yuksel, 2013).…”

Section: 1 Backgroundmentioning

confidence: 99%

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Recycling construction and industrial landfill waste material for backfill in horizontal ground heat exchanger systems

Al-Ameen

Ianakiev

Evans

2018

Energy

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This research experimentally and numerically investigates the possibility of recycling some low cost construction and industrial waste landfills materials as potential backfills in horizontal ground heat exchangers (HGHE). The aim of this study was to compare the temperature distribution development in different backfill materials with respect to time. The tested materials include sand, crushed basalt, broken brick, crushed concrete, and metallic by-products including copper slag, aluminium slag, mill-scale and iron ores (fine and pellets). Initial thermal testing on these materials in an environmental climatic chamber indicated concrete and crushed brick had similar performance to sand, whereas metallic materials had better performance by up to 77% improvement compared to sand. Various percentages of the backfill material (20, 40, 60, 80 and 100%) blended with the remaining percentage of sand showed that the higher the percentage addition of the waste material, the better the heat storage of the enhanced sand. Particle size distribution was also a significant parameter in backfill selection, where medium sized particle sizes (1.18-2 mm) performed 92% better compared to course and fine gradations of the same material. An experimental setup of a HGHE system was then constructed and filled with the best performing backfill materials to determine the heat storage and release processes on the thermal performance of the system. The paper also reports results from a transient three-dimensional finite volume model developed in ANSYS Fluent 17.2 computational fluid dynamic (CFD) software of a thin section of a HGHE. The experimental and numerical model were used to predict and analyse the temperature distribution developing within the surrounding backfill material with respect to charging (heating) and discharging (extracting heat) modes of the HGHE. Results obtained from both experimental and numerical studies show the temperature range and duration of hot water produced from the system were in line with low temperature space heating guidelines and that mill-scale, copper slag and aluminium slag were the best backfill materials, where the thermal capacity of the HGHE system can be doubled using these materials, compared to the use of sand alone. Congruence between the numerical simulations and experimental data was found.

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“…For heat extraction, either schemes based on laying pipes over a large area at a depth of 1.5-2 m or schemes which entail drilling wells and organizing vertical or inclined probes in them are usually adopted. The use of low-grade heat from groundwater also requires drilling at least two wells [4,5]. A disadvantage of such solutions is the significant complexity and consequently the high cost of preparatory work.…”

Section: Introductionmentioning

confidence: 99%

Monitoring System of a Heat Pump Installation for Heating a Rural House Using Low-grade Heat from a Surface Watercourse

Kharchenko

Sychov

Angelis

et al. 2020

JSAN

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Increasing the efficiency of heat pump systems primarily used for heat supply to buildings is an important topic. This is especially true for systems constructed according to non-standard schemes and which use low-grade heat from various sources that are rarely considered for these purposes. Such studies require special, often expensive, data acquisition systems. In this paper, a low-cost computer-based monitoring system is presented. The monitoring system incorporates solutions which are new or seldom used. It is shown that modern semiconductor thermistors can replace commonly used platinum temperature sensors and thermocouples. A proposal for processing frequency output signals from sensors through an analog-to-digital converter and a way to reduce the number of required input channels are described. The monitoring system allows optimization of various types of heat-pump-based installations. The system has been used for quite a long time to monitor the operation of the heat pump installation using low-grade heat from a surface watercourse. With its help, the feasibility of using the previously proposed submersible floating heat exchanger is justified and the optimal scheme for its placement in the watercourse is determined.

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Horizontal and compact ground heat exchangers

Cited by 8 publications

References 41 publications

Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

Recycling construction and industrial landfill waste material for backfill in horizontal ground heat exchanger systems

Monitoring System of a Heat Pump Installation for Heating a Rural House Using Low-grade Heat from a Surface Watercourse

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