Recent advancements in earth air tunnel heat exchanger (EATHE) system for indoor thermal comfort application: A review

Singh, Ram Karan; Sawhney, Ravinder Singh; Lazarus, Ian Joseph; Kishore, V.V.N.

doi:10.1016/j.rser.2017.08.058

Cited by 93 publications

(22 citation statements)

References 121 publications

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“…A further classification in the EAHX system with horizontal ducts can be made between single-layer configuration, with all the ducts buried at a single depth level, and multi-layer configuration where the ducts, horizontally oriented, are buried one on the other at various depths in the ground and separated by vertical drops. Single layer configurations are by far the most used among the solutions proposed in literature [10] , [12] . At the best of our knowledge, very few are the investigations performed on multilayer EAHX systems but worthy of attention is the work proposed by de Jesus Freire et al [13] .…”

Section: Introductionmentioning

confidence: 99%

The employment of an earth-to-air heat exchanger as pre-treating unit of an air conditioning system for energy saving: A comparison among different worldwide climatic zones

D’Agostino

Greco

Masselli

et al. 2020

Energy and Buildings

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Highlights Earth-to-Air Heat eXchanger uses geothermal energy for air conditioning systems. A 2D mathematical model of the EAHX is developed to obtain the system performance. A case study office building is analysed for eight worldwide localities. Air temperature variation along the EAHX and EAHX efficiency are calculated. Reduction of thermal capacity of the coils inside air handling unit is evaluated.

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Section: Introductionmentioning

confidence: 99%

The employment of an earth-to-air heat exchanger as pre-treating unit of an air conditioning system for energy saving: A comparison among different worldwide climatic zones

D’Agostino

Greco

Masselli

et al. 2020

Energy and Buildings

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“…By contrast, air velocity and pipe length influence the process less. Singh et al (2017) concluded that longer pipes with smaller diameter achieve better heat transfer, but lead to a higher pressure drop [32]. Typical diameters used are about 0.05-1 m, while lengths of horizontal pipes are usually 30-70 m. In addition, the thermal performance decreases for high air velocities (typical values are about 2-5 m s −1 ) [33,34].…”

Section: Introductionmentioning

confidence: 99%

Earth-Cooling Air Tunnels for Thermal Power Plants: Initial Design by CFD Modelling

Camba

Petrakopoulou

2020

Energies

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Climate change and the increase of the consumption of energy resources are expected to further strain anticipated water stress scenarios. The operation of existing thermal plants depends greatly on their cooling capacity, for which large amounts of water are withdrawn and consumed. Dry-cooling systems, on the other hand, do not require water, but they are less efficient and more expensive relative to conventional water-based systems, because of their dependency on the ambient temperature. This paper introduces the new idea of replacing water-based cooling systems in thermal power plants with earth-cooling air tunnels. Based on the concept of existing earth-air heat exchangers, the system takes advantage of the low and relatively constant underground temperature for cooling ambient air before it is introduced in the air condenser of the plant. In this work, we present an initial design of such an open-loop system for a 20 MW concentrated solar power plant. A sensitivity study of both geometric and flow parameters is realized using computational fluid dynamics simulations. Under the requirements of the study, we find that a system using a design of pipes with 0.5 m diameter and about 300 m length can be considered a technically viable zero-water alternative to water-cooling technologies.

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“…Bordoloi et al [23], Presented a review of the previous research on heat exchangers and explains the theoretical and practical research on the various forms of EAHE and analyzes the thermal efficiency effects. Ramkishore Singh et al [24], Review the latest innovations in the EATHE configurations over the last ten years with a particular focus on the layout sections of these technologies for the realization of fresh domestic climate as a reduced power consumption in cooling and heating operations in desert houses. The results showed that, regardless of long-term EATHE studies, economic analysis is limited in the literature and can not necessarily be applied.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Numerical Investigation of the thermal properties effect on the soil temperature in Adrar region.

Belatrache

Saifi

Harrouz

et al. 2020

AJRESD

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Geothermal energy is part in various clean sources in the world. The geothermal energy resources originate from the ground and its temperature varies according to depth and its thermal properties. This paper presents a numerical simulation of the soil temperature variation in different thermal properties depending on the nature of the soil. three different Specific heat capacity and thermal conductivity are used in this this simulation and have applied in Adrar city. Three soils A, B and C, each soil has characteristics that are different from the others are presented. The results showed that the soil C is considered the best soil in terms of results in the southern desert region that can be applied to help in ventilation, cooling homes in summer (22°C) and natural heating in winter (31°C). A is considered to be a soil with high thermal insulation and its results can be used for agricultural irrigation applications in desert areas in the summer season because its temperature stabilizes at 26 °C. As an economic vision, it can use the soil B in depth of 3 m to reduce costs, based on the convergence of the results of soil C in this depth, but it's remain less effective

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Recent advancements in earth air tunnel heat exchanger (EATHE) system for indoor thermal comfort application: A review

Cited by 93 publications

References 121 publications

The employment of an earth-to-air heat exchanger as pre-treating unit of an air conditioning system for energy saving: A comparison among different worldwide climatic zones

The employment of an earth-to-air heat exchanger as pre-treating unit of an air conditioning system for energy saving: A comparison among different worldwide climatic zones

Earth-Cooling Air Tunnels for Thermal Power Plants: Initial Design by CFD Modelling

Modelling and Numerical Investigation of the thermal properties effect on the soil temperature in Adrar region.

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