Ground coupled heat exchangers: A review and applications

Soni, Suresh Kumar; Pandey, Mukesh; Bartaria, V. N.

doi:10.1016/j.rser.2015.03.014

Cited by 160 publications

(54 citation statements)

References 86 publications

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“…Ground energy storage using boreholes is the most widely used method of seasonal energy storage. Models of ground heat exchangers and their applications are reviewed by Soni et al (2015). Aquifer thermal energy storage systems use natural water in a saturated and permeable underground layer as the (2010) Weber ( Optimization of seasonal storage for community-level energy systems: status and needs 173 storage medium (Lee 2010).…”

Section: Modeling Analysis and Optimizationmentioning

confidence: 99%

Optimization of seasonal storage for community-level energy systems: status and needs

Koohi-Fayegh

Rosen

2017

Energ. Ecol. Environ.

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The status and needs relating to the optimal design of community seasonal energy storage are reported. Thermal energy storage research has often focused on technology development and integration into buildings, but little emphasis has been placed on the most advantageous use of thermal storage in community energy systems. Depending on the composition and characteristics of a community, the most appropriate community thermal storage may differ from that for a single building. District energy systems usually link thermal users to cold supplies and/or heat supplies (e.g., solar thermal energy, geothermal energy from ground-source heat pumps or geothermal hot zones, industrial waste heat, thermal energy from cogeneration or trigeneration). It is demonstrated that the optimal integration of these technologies can be enhanced through the use of appropriate seasonal thermal energy storage and that community-level seasonal storage can facilitate the development of smart net-zero energy buildings and yield efficiency, economic and environmental benefits. Issues that need to be resolved to allow optimal solutions to be attained are described. Advanced tools are required for modeling, simulation, analysis, improvement, design and optimization, which incorporate advanced methods like exergy analysis. The most appropriate scale, number and type (e.g., sensible, latent, thermochemical) of thermal storages in a community need to be better assessed, and the appropriate time duration capacities for each determined in an optimal manner. This is particularly important since a combination of short-, medium-and long-term storage is sometimes required to yield the most benefits from community energy systems.

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Section: Modeling Analysis and Optimizationmentioning

confidence: 99%

Optimization of seasonal storage for community-level energy systems: status and needs

Koohi-Fayegh

Rosen

2017

Energ. Ecol. Environ.

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“…However, these energy performances depend highly on climate and soil conditions. Recently, Soni et al [8] performed a literature review of performances evaluation of ground coupled heat exchangers including the EAHX. The authors reported experimental as well as numerical investigations on EAHX alone or coupled with other active/passive systems such as electrical air conditioner, wind catcher, solar chimney and solar duct heater.…”

Section: Experimental Projects and Guidelinesmentioning

confidence: 99%

Experimental and numerical study of an earth-to-air heat exchanger for air cooling in a residential building in hot semi-arid climate

Khabbaz

Benhamou

Limam

et al. 2016

Energy and Buildings

115

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Experimental and numerical study of an earth-to-air heat exchanger for air cooling in a residential building in hot semi-arid climate, Energy and Buildings http://dx.doi.org/10. 1016/j.enbuild.2016.04.071 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. 3 ABSTRACT This work deals with an experimental and numerical study of an Earth-to-Air Heat Exchanger (EAHX) for air cooling, connected to a residential building located in Marrakech (Morocco) which climate is a hot semi-arid one. The EAHX consists of three parallel PVC pipes of 72 m length each and 15 cm inside diameter, buried at 2.2-3.2 m depth. Each pipe is equipped with a fan, which blows treated air into the building. The experimental study consists of summer monitoring of the EAHX via measurements of air temperature and humidity throughout the exchanger, as well as at its inlet and outlet to the building for two fixed values of the airflow rate. The experimental results show that the EAHX is a good semipassive system for air refreshment, as the recorded blown air temperature into the building is quasi-constant at 25 °C with air humidity around 40%, even though the outside temperature reaches more than 40 °C. Furthermore, the reduction of daily and annual air temperature amplitudes is characterized by an exponential drop as a function of pipe length. The characteristic length is found to be around 20m and 70m respectively for the daily and annual air temperature amplitudes reduction. Moreover, it is shown that the design guidelines from literature cannot straightforwardly be applied to an EAHX which is subject to meteorological disturbance from the upper surface and/or which is not operated all year round, for which numerical simulation with a validated models remains necessary. 1 EXPERIMENTAL AND NUMERICAL STUDY OF AN EARTH-TO-AIR HEAT EXCHANGER FOR AIR COOLING INOn the other hand, dynamic simulations of the EAHX using TRNSYS software (TYPE 460) were performed with one pipe or three pipes continuously running. Good agreement was found between the simulation and experimental results. Simulation results show that the EAHX can perform a maximum drop of air temperature as high as 19.5 °C and 18.3 °C respectively for an EAHX with one and three pipes. The achieving specific cooling capacity is 58 W/m 2 (one pipe) and 55 W/m 2 (three pipes) obtained for air temperatures of 25 °C and 26 °C respectively, at the EAHX outlet and 44.6 °C at its inlet.

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“…Despite of the recent trends in TPCT studies, there are few studies concerning modern refrigerants as working fluids of wickless heat pipe, and their performance is not compared directly. The present study provides such comparison in the temperature range characteristic for air conditioning recuperation systems [17,18], heat recovery from wastewater in sewers [19] or ground heat exchangers [20].…”

Section: Introductionmentioning

confidence: 99%

Investigation of two-phase thermosyphon performance filled with modern HFC refrigerants

Górecki

2018

Heat Mass Transfer

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Two-phase closed thermosyphons (TPCTs) are widely utilized as heat exchanger elements in waste heat recovery systems and as passive heating/cooling devices. They are popular because of their high thermal conductivity, simple construction and reliability. Previous researches indicate that refrigerants are performing better than typical TPCT working fluids like deionized water or alcohols in the low temperature range. In the present study three HFC (Hydrofluorocarbons) refrigerants were tested: R134a, R404A and R407C. The total length of the investigated TPCT is 550 mm with equal length (245 mm) condenser and evaporator sections. Its outer diameter is 22 mm with 1 mm wall thickness. The evaporator section was heated by hot water with varying inlet temperature by 5 K step in the range of 288 K -323 K. The condenser was cooled by cold water with inlet temperature kept at a constant value of 283 K. It was found that using R134a and R404A as working fluids heat transfer rates are the highest. For both refrigerants 10% is optimal filling ratio. They can be utilized interchangeably because the differences between their throughputs are within uncertainty bands. R407C performance was 50% lower. Other disadvantages of using this refrigerant are relatively high working pressures and higher optimal filling ratio (30%).

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Ground coupled heat exchangers: A review and applications

Cited by 160 publications

References 86 publications

Optimization of seasonal storage for community-level energy systems: status and needs

Optimization of seasonal storage for community-level energy systems: status and needs

Experimental and numerical study of an earth-to-air heat exchanger for air cooling in a residential building in hot semi-arid climate

Investigation of two-phase thermosyphon performance filled with modern HFC refrigerants

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