A review on effect of geometrical, flow and soil properties on the performance of Earth air tunnel heat exchanger

Agrawal, Kamal Kumar; Agrawal, Ghanshyam Das; Misra, Rohit; Bhardwaj, Mayank; Jamuwa, Doraj Kamal

doi:10.1016/j.enbuild.2018.07.035

Cited by 77 publications

(23 citation statements)

References 116 publications

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“…This is due to its very small magnitude, when compared to the soil surrounding the pipe. For the same reason, the material of the pipe has no influence on the cooling performance and a cheap material like PVC can be used [48].…”

Section: Pipe Thickness Pipe Material and Distance Between Pipesmentioning

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operation of existing thermal plants depends greatly on their cooling capacity, for which large amounts of water are withdrawn and consumed.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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Section: Pipe Thickness Pipe Material and Distance Between Pipesmentioning

confidence: 99%

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

Camba

Petrakopoulou

2020

Energies

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“…The results are that a part of the primary energy could be preserved and the environmental impact [5] , [6] , [7] of the systems could be mitigated [8] , [9] . Specifically, the use of geothermal energy for improving the thermal indoor environment is typically addressed by means of the following three solutions [10] : earth homes; Ground-Source Heat Pumps (GSHPs); Earth-to-Air Heat eXchangers (EAHXs). …”

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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“…The EAHE performance is affected by geographical and climate conditions, thermo-physical soil properties, constructive parameters, and operational conditions [4]. Analytical [5][6][7][8], experimental [9][10][11], and numerical [12][13][14] approaches can be employed to investigate these aspects.…”

Section: Introductionmentioning

confidence: 99%

Methodology Allying Standard Penetration Test and Era-Interim Data Set for Numerical Simulations of Earth-Air Heat Exchangers

Victoria

Hermes

Vaz

et al. 2020

ARFMTS

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Earth-Air Heat Exchangers are devices installed on buildings to reduce electrical energy consumption with air conditioner systems. They consist of buried ducts where the air is blown and induces heat exchange with the surrounding soil. Aiming to develop a consistent numerical simulation approach to study its behavior, this research allies the usage of Standard Penetration Test (SPT) and Era-Interim as part of the computational methodology. The results indicate that the proposed methodology can be adequately adopted, allowing the soil properties assignment from SPT reports, the prescription of inlet air temperature, and soil surface temperature from ERA/Interim data.

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A review on effect of geometrical, flow and soil properties on the performance of Earth air tunnel heat exchanger

Cited by 77 publications

References 116 publications

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

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

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

Methodology Allying Standard Penetration Test and Era-Interim Data Set for Numerical Simulations of Earth-Air Heat Exchangers

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