Modelling and performance analysis of an earth-to-air heat exchanger in a pilot installation

Rosa, N.; Santos, Paulo; Costa, J.J.; Gervásio, Helena

doi:10.1177/1744259117754298

Cited by 31 publications

(13 citation statements)

References 18 publications

(18 reference statements)

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“…On the other hand, when direct expansion GHE systems are investigated, fluid temperature profiles are coupled with the pressure, density, and specific heat profile along the pipes, properties all affected by the phase change of refrigerant inside GHE [40,91,92]. Several authors used dimensionless temperature forms like thermal efficiency or effectiveness of the heat exchanger where temperatures T in , T out , and T g are inlet, outlet, and ground temperatures [58,93,107,108]:…”

Section: Performance Indicators For the Evaluation Of Ghesmentioning

confidence: 99%

“…Qi et al [115] applied the same approach in their study and also defined analogous thermal performance uniformity coefficient. The COP of the EAHE system, expressed as exchanged heat and consumed power, points out the existence of optimum values of pipe diameter, meaning that larger does not always mean the better [107]. The pressure drop was indirectly taken into account during experiments by Agrawal et al [59] by monitoring fan power consumption to express heat exchanger COP.…”

Section: Performance Indicators For the Evaluation Of Ghesmentioning

confidence: 99%

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Application and Design Aspects of Ground Heat Exchangers

et al. 2021

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With the constant increase in energy demand, using renewable energy has become a priority. Geothermal energy is a widely available, constant source of renewable energy that has shown great potential as an alternative source of energy in achieving global energy sustainability and environment protection. When exploiting geothermal energy, whether is for heating or cooling buildings or generating electricity, a ground heat exchanger (GHE) is the most important component, whose performance can be easily improved by following the latest design aspects. This article focuses on the application of different types of GHEs with attention directed to deep vertical borehole heat exchangers and direct expansion systems, which were not dealt with in detail in recent reviews. The article gives a review of the most recent advances in design aspects of GHE, namely pipe arrangement, materials, and working fluids. The influence of the main design parameters on the performance of horizontal, vertical, and shallow GHEs is discussed together with commonly used performance indicators for the evaluation of GHE. A survey of the available literature shows that thermal performance is mostly a point of interest, while hydraulic and/or economic performance is often not addressed, potentially resulting in non-optimal GHE design.

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Section: Performance Indicators For the Evaluation Of Ghesmentioning

confidence: 99%

Section: Performance Indicators For the Evaluation Of Ghesmentioning

confidence: 99%

Application and Design Aspects of Ground Heat Exchangers

et al. 2021

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“…The Nusselt number depends on the surface thermal condition of the pipe; it indicates that the flow is laminar or turbulent, related to the Reynolds number [11,12].…”

Section: Sub-soil Temperature Modelmentioning

confidence: 99%

Experimental and numerical analysis of soil - to - air heat exchanger system for domestic buildings

Damodharan¹,

Ramu²,

Abuthakeer³

2020

THERM SCI

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Soil-to-air heat exchanger concept is one of the efficient methods to reduce the cooling effort required for any air conditioning system. In this paper, a theoretical model of soil-to-air heat exchanger has been developed to predict the air temperature in the outlet of the system during a hot atmospheric condition. This theoretical model is used to predict the subsoil temperature for a specific ambient condition in a southern part of India and also compared with the measured subsoil temperature. Performance of the soil-to-air heat exchanger system has been calculated during peak hours in summer and found to have the potential to reduce the energy required to cool the building.

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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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Modelling and performance analysis of an earth-to-air heat exchanger in a pilot installation

Cited by 31 publications

References 18 publications

Application and Design Aspects of Ground Heat Exchangers

Application and Design Aspects of Ground Heat Exchangers

Experimental and numerical analysis of soil - to - air heat exchanger system for domestic buildings

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

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