Experimental and numerical analysis of an earth–air heat exchanger

Vaz, Joaquim; Sattler, Miguel Aloysio; Santos, Elizaldo Domingues dos; Isoldi, Liércio André

doi:10.1016/j.enbuild.2011.06.003

Cited by 123 publications

(108 citation statements)

References 11 publications

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“…Também compõe esta metodologia o modelo computacional simplificado de TCSA de Brum et al (2012) validado e verificado com base nos resultados obtidos em Vaz (2011) e Vaz et al (2011), que foi aperfeiçoado para ser aplicado neste trabalho.…”

Section: Materiais E Métodosunclassified

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Estudo Do Potencial Térmico De Trocador De Calor Solo-Ar Em Dois Tipos De Solos No Município De Rio Grande (Rs)

Rodrigues¹,

Coswig²,

Camargo³

et al. 2017

R. bras. Ener. Renov.

Self Cite

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Section: Materiais E Métodosunclassified

“…Vaz et al (2011). Na saída do duto, foi imposta para o ar a condição pressão (manométrica) atmosférica normal denotada por p, e valor igual a zero.…”

Section: Introductionunclassified

Estudo Do Potencial Térmico De Trocador De Calor Solo-Ar Em Dois Tipos De Solos No Município De Rio Grande (Rs)

Rodrigues¹,

Coswig²,

Camargo³

et al. 2017

R. bras. Ener. Renov.

Self Cite

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“…Several experimental and/or numerical studies on the EAHX cooling performances in hot climate, such as one of Marrakech (Morocco), have been performed through the world [9][10][11][14][15][16][17][18][19][20][21]. All of these studies concluded on the very interesting performances of the EAHX for air cooling, although these performances depend on many parameters, in particular the soil properties and the local climate.…”

Section: Experimental Projects and Guidelinesmentioning

confidence: 99%

“…Vaz and co-workers [9,10] investigated, experimentally and numerically, the thermal behavior of an EAHX coupled to a built environment, located in the city of Viamão (southern Brazil, with humid subtropical climate). Based on the experimental work of Vaz et al [9], Brum et al [11] developed a so-called "reduced model" to predict the thermal performance of the EAHX.…”

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

108

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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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“…In addition, there are also analysis focused on the effect of air velocity and its turbulence on the performance of the ground to air heat exchanger system. These works are mainly based on computational fluid dynamics approach [14]- [16].…”

Section: Numerical Modelingmentioning

confidence: 99%

Solutions for Energy Conservation and Pollution Reduction: Earth-Air Heat Exchangers

Teodosiu¹,

Niculiţă²,

Teodosiu³

2015

IJESD

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Abstract-The aim of this work is to evaluate the capacity of earth-air heat exchanger (EAHX) systems to contribute to energy and pollution savings for heating and cooling of buildings. This is fulfilled by means of numerical simulations (dynamic regime) based on coupled model: "weather file/soil model/EAHX/ventilation system/building. Detailed results concerning EAHX efficiency, energy conservation and pollution reduction (in comparison with classical solutions for winter heating and summer cooling), are shown for three different Romanian regions for a single-family separate house.

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Experimental and numerical analysis of an earth–air heat exchanger

Cited by 123 publications

References 11 publications

Estudo Do Potencial Térmico De Trocador De Calor Solo-Ar Em Dois Tipos De Solos No Município De Rio Grande (Rs)

Estudo Do Potencial Térmico De Trocador De Calor Solo-Ar Em Dois Tipos De Solos No Município De Rio Grande (Rs)

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

Solutions for Energy Conservation and Pollution Reduction: Earth-Air Heat Exchangers

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