Investigating the effects of geometric parameters on finned conical helical geothermal heat exchanger and its energy extraction capability

Jamshidi, N.; Mosaffa, A.

doi:10.1016/j.geothermics.2018.07.007

Cited by 42 publications

(15 citation statements)

References 37 publications

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“…Moreover, the results indicated higher local convective heat transfer coefficient by increment in the concentration of the nanofluids. Jamshidi et al [50] numerically investigated the performance of geothermal heat exchanger and the effects of utilizing nanofluids in extracted heat. In their study, 2 3 nano particles were employed in volumetric concentrations between 0 and 0.5%.…”

Section: Figure 5 Borehole Length Reduction For Various Nanofluids Inmentioning

confidence: 99%

Applications of nanofluids in geothermal: A review

Ahmadi¹,

Ramezanizadeh²,

Nazari³

et al. 2018

MMEP

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Geothermal energy is one of the most suitable sources of energy since it is possible to use it continuously for generating power and providing heat. Firstly, recent trends in geothermal energy are discussed and compared with other types of renewable energies. According to the results of this section, geothermal energy is an attractive choice for future power generation due to its low carbon dioxide emission and levelzied cost of electricity in comparison with other renewable energy sources. Afterwards, applications of nanofluid in geothermal-based energy systems are reviewed and their important results are represented. On the basis of literature review, using nanofluids can result in augment in geothermal systems. The enhancement is dependent on several factors including the type of nanofluid, concentration and system specification. According to the results of a study, the effect of using nanofluid on heat transfer rate became more significant at higher flow rates. In addition, using nanofluids can reduce the size of heat exchangers used in geothermal-based system. The main effects of employing nanofluids is increase in convective heat transfer and pressure loss.

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Section: Figure 5 Borehole Length Reduction For Various Nanofluids Inmentioning

confidence: 99%

Applications of nanofluids in geothermal: A review

Ahmadi¹,

Ramezanizadeh²,

Nazari³

et al. 2018

MMEP

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“…Numerous efforts have focused on the effects of particle diameter and sphericity on the thermal performance of heat exchangers using nanofluid as heat transfer fluid. Jamshidi et al [18] numerically investigated the effects of nanoparticle diameter on the energy extraction capability of finned conical helical GHE. The results showed that the heat transfer coefficient decreased when the nanoparticle diameter increased.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, there is no effort focusing on the effect of nanoparticle sphericity on the heat transfer of GHEs using nanofluids. Meanwhile, although Jamshidi et al [18] studied the effect of nanoparticle diameter on the thermal performance of helical GHE, more investigations are necessary for the effect of nanoparticle diameter on the heat transfer of double U-tube GHE. Therefore, the present study is expected to fill the research gap.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Effect of Nanoparticle Diameter and Sphericity on the Thermal Performance of Geothermal Heat Exchanger Using Nanofluid as Heat Transfer Fluid

Jiang

Wang

2020

Energies

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The geothermal heat exchanger system is one of the most energy-efficient and environmentally friendly building service systems. In the present study, CuO/water nanofluid was used as the heat transfer fluid to enhance the energy efficiency of the geothermal heat exchangers. A three-dimensional numerical model was employed to investigate the effect of nanoparticle diameter and sphericity on the thermal performance of the geothermal heat exchanger, and it was well validated against the experimental results of nanofluids in the geothermal heat exchangers. The numerical results showed that nanoparticles with a diameter of 5 nm and 50 nm were not recommended for the nanofluids used in the geothermal heat exchangers due to the performance efficiency coefficient lower than 1, and the optimum diameter was 40 nm, which had the highest performance efficiency coefficient (1.004875). Moreover, the spherical particle-based nanofluid was characterized by the 8.55% higher energy efficiency, in comparison to rod-shaped particle-based nanofluid. Therefore, the application of nanofluid in the geothermal heat exchanger can enhance heat transfer, and the proposed optimum particle diameter and sphericity could contribute to higher energy efficiency.

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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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Investigating the effects of geometric parameters on finned conical helical geothermal heat exchanger and its energy extraction capability

Cited by 42 publications

References 37 publications

Applications of nanofluids in geothermal: A review

Applications of nanofluids in geothermal: A review

Numerical Investigation of the Effect of Nanoparticle Diameter and Sphericity on the Thermal Performance of Geothermal Heat Exchanger Using Nanofluid as Heat Transfer Fluid

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

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