Investigation on soil thermal saturation and recovery of an earth to air heat exchanger under different operation strategies

Niu, Fuxin; Yu, Yuebin; Yu, Daihong

doi:10.1016/j.applthermaleng.2014.11.069

Cited by 65 publications

(15 citation statements)

References 20 publications

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“…A further important problem to be analysed by means of 2D models is represented by the soil thermal saturation caused by the presence of the EAHX. This aspect was studied by Niu et al [29] in 2015 through a numerical model founded on the transient method of control volume. They observed that the effect of saturation of the soil becomes relevant in the degradation of the cooling capacity if the system operates in continuous mode, whereas an intermittent working mode during the day allows the soil thermal recovering and consequently it mitigates the degradation of the energy performances.…”

Section: State-of-the Art Research Gap and Goal Of The Papermentioning

confidence: 99%

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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: State-of-the Art Research Gap and Goal Of The Papermentioning

confidence: 99%

“…with

, that is one of the constants of the K-

model for turbulent flow [29] ; the energy equation for the air flow:

…”

Section: Mathematical Model Of Eahxmentioning

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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show abstract

“…Table 5 shows the pipe length effect on the performance of the EAPHE system. Recently, Niu et al [93] performed the analysis of the integrated chimney system using the two-dimensional model. The result of the analysis was concluded by comparing the experimental data that was collected from the existing system that was used to develop indoor thermal comfort.…”

Section: Integration Of Eaphe System With Solar Chimneymentioning

confidence: 99%

Development of Passive Energy Source as Earth Air Pipe Heat Exchangers (Eaphe) System - A Review

Verma

Bansal

Rana

2020

Journal of Thermal Engineering

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Diversity in living standards and population growth leads to increased global energy consumption. Human comfort always plays a vital role in using different means to reduce the effects of weather conditions. The building sector captures approximately 40% of the global energy and it is most commonly used for cooling and for heating of the space occupied due to the use of appliances such as room heaters or air coolers, air conditioners, etc. The use of these appliances contributes significantly to global warming, which is a very serious environmental problem. Passive energy sources are used widely to reduce the consumption of energy due to heating and cooling of the building. Earth air pipe heat exchanger is one of the passive cooling/ heating technology used for the indoor thermal comfort of the occupants. In this review article, various discussion has been done on the use of passive energy explained by the earth air pipe heat exchanger and various investigations conducted by authors under different conditions and parameters like air velocity, pipe depth, pipe length, etc. that the thermal conductivity of the soil is the key point to the efficient operation of the earth air pipe heat exchanger system and it is also necessary to maintain the thermal conductivity of the soil in the vicinity of the pipe in order to achieve better performance in operation.

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“…Benhammou et al [9] used a combination of the underground exchanger and wind louver as a non-active cooling system in the summer and concluded that the flow of air from this hybrid system is much more effective than using the wind louver alone. Niu et al [10] used a two-dimensional and transient model to numerically study the retrieval and thermal saturation of soil in air-to-ground heat exchangers and offered to retrieve the system at times that are not in use. Barakat et al [11] reviewed the increase in the power output of a gas turbine using an air-to-ground heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Investigating the possibility of using the underground tunnel for air-conditioning in Tehran

Nazer-Nejad

Saffarian

Behbahani–Nejad

2018

J Braz. Soc. Mech. Sci. Eng.

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The use of underground airconditioning tunnel for Tehran's climate has been investigated. This study is conducted over a 24-h period from 0 to 24 h. Simulation is performed using computational fluid dynamics. The continuity, Navier-Stokes, and energy equations are solved for the air inside the underground pipe. Also, the energy equation is solved for the surrounding soil. The numerical solution is performed by the Fluent software by adding a user-defined function. The simulation results for this system indicate that the inlet air temperature has a significant effect on the outlet temperature. The results show that for a short period in the middle of the day, the maximum output temperature of the system reaches to 27°C. So, except for a short period of the day, this exchanger creates a comfortable condition for the city of Tehran. Also, due to the thermal saturation of the soil, this system is not suitable for continuous work. It is only suitable for industrial environments that operate in a short period of time during the day.

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Investigation on soil thermal saturation and recovery of an earth to air heat exchanger under different operation strategies

Cited by 65 publications

References 20 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

Development of Passive Energy Source as Earth Air Pipe Heat Exchangers (Eaphe) System - A Review

Investigating the possibility of using the underground tunnel for air-conditioning in Tehran

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