CFD analysis based parametric study of derating factor for Earth Air Tunnel Heat Exchanger

Misra, Rohit; Bansal, Vikas; Agrawal, Ghanshyam Das; Mathur, Jyotirmay; Aseri, Tarun Kumar

doi:10.1016/j.apenergy.2012.09.041

Cited by 99 publications

(43 citation statements)

References 29 publications

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“…3 Model validations 10 3.1 Introduction of existing experimental facility 11 Based on the existing facility, the field testing data is used to verify the model. An existing test is presented based on the tested dates.…”

Section: Heat Transfer At the Boundarymentioning

confidence: 99%

“…Misra et al used CFD software to study the effect of soil thermal 15 conductivity, duration of continuous operation, pipe diameter and flow velocity on the thermal 16 performance of EAHE based on parametric method. Transient operating conditions greatly 17 affected the thermal performance of EATH [11]. According to the methods mentioned above, 18 the performance for the EAHE is greatly evaluated.…”

mentioning

confidence: 99%

“…It can free supply 8 fresh pre-heated or pre-cooled air even 100% cooling or heating when the capacity is enough. 9 10 In order to obtain the thermal performance of an EAHE, many mathematic models, computing 11 methods or tools were greatly applied. Krarti and Kreider considered the EAHE heat transfer 12 problem as a transient one and proposed analytical model assumes.…”

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confidence: 99%

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

Niu

2015

Applied Thermal Engineering

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Section: Heat Transfer At the Boundarymentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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

Niu

2015

Applied Thermal Engineering

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“…Most of these models are based on finite differences. Some of them are limited to the description of only one ""typical"" pipe [14,18,[28][29][30][31]. Others deal with several parallel running pipes, with or without possibility to treat more complicated cases than steady state flow rate, homogenous and laterally adiabatic soils, or sole sensible heat exchange [32][33][34][35].…”

Section: Modelsmentioning

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

113

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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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“…It is not only possible to adjust the air temperature by geothermal energy, but also provide an effective method for the study of airborne air tissue and load calculation of underground engineering, and improve the air conditioning system design. Air and underground engineering surrounding rock heat transfer numerical simulation, predecessors have done a lot of work, put forward the relevant calculation model and method [1][2][3][4], Guo Yi Chan air three-dimensional heat transfer model is simplified into one-dimensional heat transfer model, not considered The actual three-dimensional heat transfer of air [5]; the actual engineering model is often more complex, direct calculation is more difficult, the current research on the thermal engineering of underground engineering is the actual model is simplified into a relatively simple rule model, but not all The simplified method will bring more accurate results. Therefore, it is an important problem to study the feasibility and accuracy of the simplified model of underground engineering actual model.…”

mentioning

confidence: 99%

Numerical Simulation Analysis of Model Simplification and Heat Transfer in Position Engineering

Yuan¹,

Liu²,

Zhang³

2017

Proceedings of the 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017)

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Abstract:In order to determine the processing capacity of the airflow and the air conditioning capacity of the position engineering, the heat transfer process of the air and the wall in the project is analyzed. The actual arch engineering is simplified into equal volume square and spherical engineering respectively. The physical mathematical model of underground heat transfer is proposed, and the initial conditions and boundary conditions are accorded with the engineering practice. The numerical simulation of the heat exchange and related parameters of the airflow and engineering wall is realized by FLUENT software. The paper analyzes and compares the errors of arched structure engineering and two kinds of simplified engineering, and draws the conclusion that it is feasible to simplify the project and simplify the engineering error.Keywords: Position engineering, initial condition, numerical simulation 1.IntroductionPosition works usually usually have low temperature, wet conditions. The heat transfer capacity of the underground wall is a key basic data for reasonably determining the capacity of the ventilation and air conditioning system. It is not only possible to adjust the air temperature by geothermal energy, but also provide an effective method for the study of airborne air tissue and load calculation of underground engineering, and improve the air conditioning system design. Air and underground engineering surrounding rock heat transfer numerical simulation, predecessors have done a lot of work, put forward the relevant calculation model and method [1][2][3][4], Guo Yi Chan air three-dimensional heat transfer model is simplified into one-dimensional heat transfer model, not considered The actual three-dimensional heat transfer of air [5]; the actual engineering model is often more complex, direct calculation is more difficult, the current research on the thermal engineering of underground engineering is the actual model is simplified into a relatively simple rule model, but not all The simplified method will bring more accurate results. Therefore, it is an important problem to study the feasibility and accuracy of the simplified model of underground engineering actual model. Physical model and its simplification

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CFD analysis based parametric study of derating factor for Earth Air Tunnel Heat Exchanger

Cited by 99 publications

References 29 publications

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

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

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

Numerical Simulation Analysis of Model Simplification and Heat Transfer in Position Engineering

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