Improvement of the summer cooling induced by an earth-to-air heat exchanger integrated in a residential building under hot and arid climate

Benhammou, M.; Draoui, Belkacem; Messaoud, Hassani

doi:10.1016/j.apenergy.2017.10.012

Cited by 48 publications

(8 citation statements)

References 42 publications

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“…Uma dessas práticas tem sido estudada por inúmeros pesquisadores, cujo objetivo é utilizar o solo como trocador de calor em sistemas de climatização (MISRA et al, 2013;HOLLMULLER;LACHAL, 2014;BARTARIA, 2015;BENHAMMOU;HAMOUDA, 2017). Esse tipo de sistema é constituído de dutos (geralmente de policloreto de vinila (PVC), entre outros materiais) enterrados no solo, por onde o ar escoa, sendo aquecido ou resfriado a depender das condições de entrada do sistema e do solo.…”

Section: Introductionunclassified

Avaliação numérica do desempenho térmico de diferentes configurações de trocadores de calor solo-ar

2021

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Resumo Visando à diminuição do consumo de energia em edificações, devido ao uso de equipamentos de aquecimento, ventilação e ar condicionado, observa-se o aproveitamento do solo como fonte de energia. Por sua alta capacidade térmica, o solo atua como um reservatório térmico, aquecendo ou resfriando o ar do ambiente interno das edificações, conforme as condições climáticas aplicadas. Sendo assim, aplicou-se o método dos volumes finitos neste trabalho para análise do desempenho térmico desse tipo de trocador de calor solo-ar (TCSA). Inicialmente, os efeitos das propriedades térmicas do solo, da velocidade de escoamento do ar e do diâmetro do duto no desempenho térmico do TCSA foram investigados em regime permanente, por ser uma condição limite. Além disso, analisaram-se duas configurações para a distribuição do duto no solo (dois e quatro passos). A partir dos resultados, notou-se que o melhor desempenho para o TCSA foi obtido utilizando o solo saturado e operando com uma velocidade de ar de 2,5 m/s em um duto com diâmetro de 0,10 m. Em seguida, observou-se que uma distância entre as linhas de centro dos dutos de 0,5 m foi a mais apropriada. Adicionalmente, executaram-se simulações em regime transiente, empregando-se condições climáticas por meio de funções senoidais.

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Section: Introductionunclassified

Avaliação numérica do desempenho térmico de diferentes configurações de trocadores de calor solo-ar

2021

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“…There are only a few alternate light weight building materials such as the hollow clay blocks (HCB), aerated autoclaved concrete blocks (AAC), compressed earth blocks (CEB) available in the market to promote energy-efficient construction methods. In addition, the optimized orientation of the building, window-to-wall ratio, glazing proportions and shading devices must be incorporated in totality in a building envelope design process so that its thermal performance can be improved to the maximum (Benhammou et al , 2017; Al-Sanea and Zedan, 2001; Kumar and Sumar, 2013; Pathirana et al , 2019; Wang et al , 2007; Mirrahimi et al , 2016; Fallahtafti and Mahdavinejad, 2015). Such an approach can lead to lower energy by the buildings to address the energy efficiency targets.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of optimal wall materials for effective thermal performance in warm and hot climatic regions

Selvaraj¹,

Kesavaperumal

2021

OHI

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Purpose Heat gain in buildings occurs due to heat transfer through the building fabric or envelope, especially the walls and roof. The purpose of this paper is to identify and recommend the suitable wall materials for better thermal performance in buildings in warm and hot climatic zones of India. As India lies between the tropic of cancer and the equator, the solar radiation from the sun falls more on the walls than the roofs of the buildings. Thus, it is imperative to protect the walls from heat gain to promote thermal comfort in naturally ventilated buildings and reduce the energy loads due to artificial cooling systems in air-conditioned buildings. Design/methodology/approach In this paper, an investigation of heat flow characteristics in steady-state and the transient state for five different uninsulated wall structures using computational fluid dynamics (CFD) software has been carried out. The climate conditions at Madurai, India have been considered for this study. Findings The findings of the study revealed that aerated autoclaved concrete (AAC) and hollow clay blocks (HCB) for external walls in naturally ventilated buildings in warm climatic regions could improve the building’s thermal performance index and reduce peak indoor operative temperature by about 6°C–7°C. The results of steady-state and transient state analysis were found to be in good agreement with the results of the reviewed literature. Research limitations/implications Over the past few decades, only very few architects and builders have been successful in influencing their clients to accept alternate materials such as AAC blocks, HCB, stabilized earth blocks, adobe blocks, fly-ash bricks as an alternate to conventional bricks in an attempt of highlighting their benefits, such as; materials that are easily available, more energy-efficient, can withstand the extreme weather conditions, promote thermal comfort and cost-effective. This paper provides strong evidence that AAC and HCB blocks are the most appropriate materials for improving the thermal performance of envelope walls in regions where the outdoor temperatures are above 40°C. Originality/value This paper has made an attempt to identify the appropriate wall materials for effective thermal performance in warm and hot climates. A comparative analysis between five different wall types under the existing solar conditions has been analyzed using CFD simulation study in steady-state and transient conditions under summer conditions and the appropriate wall materials have been suggested. There has been no attempt carried out so far to analyze the thermal performance of different walls using 24 h transient approach in CFD.

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“…The design parameters of the EAHE are important in the ventilation capacity of the EAHE. Several studies [12][13][14][15][16][17][18][19][20][21][22][23][24] have shown that performance of an EAHE depends on several parameters: (i) the temperature decrease occurs during the first meters of EAHE, (ii) the difference in air temperature between the EAHE output and input decreases as the fluid velocity increases, (iii) the greater or the lower the temperature difference of the air at the entrance and the floor, the greater the heat transfer. On the other hand, those parameters that do not have a significant effect on performance are: (i) increasing the fluid velocity decreases the interaction time between soil and air, (ii) the greater the diameter, the greater the flow of air but greater pressure drops, (iii) the ventilation potential is very similar regardless of the material of the tube, (iv) increase the length of the tube after its optimal distance has small influence on the temperature difference.…”

Section: Introductionmentioning

confidence: 99%

Thermal potential of a geothermal earth-to-air heat exchanger in six climatic conditions of México

Rodríguez-Vázquez

Xamán

Chávez

et al. 2020

Mechanics & Industry

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In this paper, the thermal and ventilation potential of a geothermal Earth-to-Air Heat exchanger (EAHE) is studied for six weather in Mexico. The cities for the study and their climate were Villahermosa (hot-humid), Merida (hot-sub humid), Monterrey (dry), Juarez City (very dry), Zacualtipan-Hidalgo (warm-humid) and Mexico City (warm-sub-humid). The thermal behavior of the EAHE was modeled numerically for the corresponding warmest and coldest days of the year for each city and three values of Reynolds number. The 24 hrs simulations were carried out with an in-house code using data every 10 minutes. To get the results, 5,184 computational runs were necessary. The results showed that the EAHE has poor ventilation potential for climates with high levels of humidity such as Villahermosa, while for cities with low levels of humidity such as Chihuahua, the ventilation potential increases significantly, the rest of the cities fall in between. As for its application in Mexico, the results show that the EAHE is highly recommended for dry climates such as at the north of the country and not recommended for humid climates such as at the south and south-east of the country.

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Improvement of the summer cooling induced by an earth-to-air heat exchanger integrated in a residential building under hot and arid climate

Cited by 48 publications

References 42 publications

Avaliação numérica do desempenho térmico de diferentes configurações de trocadores de calor solo-ar

Avaliação numérica do desempenho térmico de diferentes configurações de trocadores de calor solo-ar

Numerical investigation of optimal wall materials for effective thermal performance in warm and hot climatic regions

Thermal potential of a geothermal earth-to-air heat exchanger in six climatic conditions of México

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