Numerical study of earth-to-air heat exchanger: The effect of thermal insulation

Xamán, J.; Hernández-Pérez, I.; Arce, J.; Álvarez, G.; Ramírez-Dávila, L.; Noh-Pat, F.

doi:10.1016/j.enbuild.2014.09.064

Cited by 56 publications

(17 citation statements)

References 34 publications

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“…PMMA shows the least demand for heat compared to others including PE, PVC, HG, and PC. We also investigated the effect of different thicknesses, including 4,6,8,10,16,20,30,40, and 50 mm of double layered PMMA. Each sheet of the material was 0.15 mm thick; hence, the total covering thickness depends on the air-gap between them.…”

Section: Resultsmentioning

confidence: 99%

“…h e = 7.2 + 3.8W (4) where h i and h e (W·m −2 ·k −1 ) are the internal and external convective heat transfer coefficients, respectively. W is the wind speed, T ai the internal air temperature, and T si the internal surface temperature.…”

Section: Calibrationmentioning

confidence: 99%

“…Reduction of energy consumption in greenhouse farming is the most significant challenge facing both researchers and growers, and as energy demand increases, both are focusing on ways to manage, save, produce, and store energy [3]. Various technologies, particularly renewable energy, are being utilized globally to fulfill energy requirements in buildings in general, including in the agriculture sector [4].…”

Section: Introductionmentioning

confidence: 99%

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Development and Optimization of a Building Energy Simulation Model to Study the Effect of Greenhouse Design Parameters

Rasheed

Lee²,

Lee

2018

Energies

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Abstract:Energy management of the greenhouse is considered to be one of the most important challenges of greenhouse farming. Energy saving measures need considered, besides applying energy supplying techniques. To address this issue, a model was developed to simulate the thermal environment of a greenhouse using a Transient Systems Simulation Program (TRNSYS 17) as a building energy simulation (BES) platform. The model was calibrated by modifying the input parameters to minimize the uncertainties obtained from the results. Nash-Sutcliffe efficiency coefficients of 0.958 and 0.983 showed good agreement between the computed and experimental results. The proposed model was used to evaluate the effects of greenhouse design parameters, including roof shape, orientation, double-glazing, natural ventilation, coverings and their thickness, on its energy conservation capacity. It was found that the most suitable design for a greenhouse located in Daegu (latitude 35.53 • N, longitude 128.36 • E) South Korea would be east-west (E-W) oriented, with a gothic-shaped roof and double-glazing of PMMA (Polymethylmethacrylate) covering. Natural ventilation reduced the inside temperature of greenhouse, thereby reducing the energy demand of cooling. The model developed can help greenhouse farmers and researchers make pre-design decisions regarding greenhouse construction, taking their local environment and specific needs into consideration.

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Section: Resultsmentioning

confidence: 99%

Section: Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and Optimization of a Building Energy Simulation Model to Study the Effect of Greenhouse Design Parameters

Rasheed

Lee²,

Lee

2018

Energies

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“…Table 1 shows the dimensions of the EAHE. To improve the thermal performance of the EAHE, this is insulated at the outlet as was reported in a previous study by the authors [25]. A c c e p t e d M a n u s c r i p t…”

Section: Physical Modelmentioning

confidence: 91%

“…The authors used a correlation to compute the convective heat transfer between the air and the soil, so more realistic conditions were assumed in this study. Subsequently, Xamán et al analyzed the effect of thermal insulation at the outlet section of EAHE in a 2-D study[25]. From the results the authors concluded that a thermal insulation of 2 inches improves the performance of the EAHE.Regarding to transient or pseudo transient numerical studies, Ghosal et al made an energy balance and compared their results with experimental data of a greenhouse air with ground air collector and with air heat exchanger [26].…”

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confidence: 99%

Pseudo transient numerical study of an earth-to-air heat exchanger for different climates of México

Xamán

Hernández-López

Alvarado-Juárez

et al. 2015

Energy and Buildings

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Analysis of an earth‐to‐air heat exchanger for enhanced residential thermal comfort

Dewangan,

Shukla,

Salhotra

et al. 2024

Env Prog and Sustain Energy

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It is well known that a massive demand for thermal comfort has resulted in a sharp rise in energy use for residential space heating and cooling. This article presents numerical simulations of a room coupled with an earth‐to‐air heat exchanger system operating at the climatic condition of 21.2497° N, 81.6050° E for both summer and winter seasons. The present study involves an estimate of monthly variations in soil temperature at different depths and a suitable geometrical arrangement of pipe is proposed. The thermal performance of the earth‐to‐air heat exchanger system in terms of the outlet air temperature and effectiveness has been calculated. It is shown that with an effectiveness of 0.77 in summer and 0.78 in winter, the present EAHE system reduces the ambient air temperature from 38 to 28.2°C in the summer and it rises from 13 to 22.9°C in winter, respectively. Finally, an improvement in the thermal comfort condition of the room exposed to the solar radiation has been examined at different time intervals and different heights of the room. During the summer the room temperature dropped by 4.2°C while in winter it rose by 5.2°C. Furthermore, the environmental effects of system have been evaluated, showing energy savings of 3.90 kWh/day during summer and 4.83 kWh/day during winter leading to a decrease in CO2 emissions of 6.13 kg/day in summer and 7.59 kg/day in winter.

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Numerical study of earth-to-air heat exchanger: The effect of thermal insulation

Cited by 56 publications

References 34 publications

Development and Optimization of a Building Energy Simulation Model to Study the Effect of Greenhouse Design Parameters

Development and Optimization of a Building Energy Simulation Model to Study the Effect of Greenhouse Design Parameters

Pseudo transient numerical study of an earth-to-air heat exchanger for different climates of México

Analysis of an earth‐to‐air heat exchanger for enhanced residential thermal comfort

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