Experimental investigation on using Al2O3/ethylene glycol-water nano-fluid in different types of horizontal ground heat exchangers

Kapıcıoğlu, Abdullah; Esen, Hikmet

doi:10.1016/j.applthermaleng.2019.114559

Cited by 50 publications

(21 citation statements)

References 38 publications

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“…On the basis of the mean fluid temperature, the base fluid properties are determined. With the input of geometry details, fluid inlet temperature, flow rate, and volume fraction, the fluid temperature profile is iterated by using Equations ( 1)- (20). The effect of nanofluids on GHX performance is estimated for heating.…”

Section: Simulation and Performance Parametersmentioning

confidence: 99%

“…They also noticed that the spherical particle‐based nanofluids were able to provide higher energy efficiency as compared with the rod‐shaped particle. Kapicioglu and Esen 20 carried out an experimental analysis of different types of horizontal GHXs using Al 2 O 3 /ethylene glycol–water nanofluid. They observed about 2.7% higher COP in U‐type GHX as compared with spiral GHX at 0.1% volumetric concentration.…”

Section: Introductionmentioning

confidence: 99%

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A study on utilization of ground source energy for space heating using a nanofluid as a heat carrier

Tarodiya

Verma

Thangavel³

2021

Heat Trans

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Ground source heat pump (GSHP) systems are well established as an energy‐efficient space conditioning device. However, for better utilization of the ground source, improvement in GSHP performance is desirable, which limits the small temperature difference between the ground and the circulating fluid. In this study, efforts have been made to investigate the performance of a ground heat exchanger (GHX) with a nanofluid as a heat carrier. Mathematical modeling is performed for the closed‐loop vertical U‐tube GHX with six different (Al2O3, CuO, graphite, multiwalled carbon nanotube, graphene, and Cu) water‐based nanofluids. The effect of different operating parameters on GHX length, fluid temperature, and pressure drop with nanofluids is determined. On the basis of the analytical results, it is found that the graphite particle‐based nanofluid plays a prominent role to enhance the performance of the GHX as compared with other nanoparticles. The maximum enhancement in the increase in outlet fluid temperature and reduction in pipe length with graphite particle‐based nanofluid are 68.3% and 63.3%, respectively, for an increase in temperature difference from 7°C to 15°C between the atmosphere and the ground. Also, with the graphite particle‐based nanofluid and the increase in pipe diameter from 20 to 50 mm, the fluid outlet temperature increases up to 11.2%, and the requirement in GHX length reduces up to 55%.

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Section: Simulation and Performance Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study on utilization of ground source energy for space heating using a nanofluid as a heat carrier

Tarodiya

Verma

Thangavel³

2021

Heat Trans

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“…The research based on theoretical relationships was the topic of the works by Pan et al [2], Zhao et al [3], Cai et al [4], and Li et al [5]. The results of experimental research are presented in the works by Cai et al [4], Widiatmojo et al [6], Li et al [7], Kapıcıoglu and Essen [8]. Numerous works relate to calculations based on numerical applications, these are, among others, works by Garoosi et al [9], Rashidi et al [10], Li et al [7], Li et al [11], Monzó et al [12] and Gan [13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Minimum Ground Temperature for Heat Extraction in Horizontal Ground Heat Exchangers

et al. 2021

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In this work, numerical simulation calculations were performed to investigate the minimum ground temperature that occurs when extracting thermal energy in a horizontal ground heat exchanger system in the Central European climate. The influence of ground thermal conductivity, heat flux extracted from the ground, periodic interruptions in the operation of the heat exchanger, periodic supply of heat energy to the ground, relative humidity of the ambient air, evaporation rate coefficient, and convective heat transfer coefficient on the ground minimum temperature were investigated. Based on the simulation, it was found that the high value of ground thermal conductivity favorably affects the operation of the installation with a ground heat exchanger. Both the reduction of the maximum heat flux taken from the ground, as well as periodic interruptions in the operation of the exchanger effectively protects the ground against excessive cooling. Further, it was found that heat supply to the ground in summer only slightly raises its minimum temperature, as well as the decrease of the relative humidity of the ambient air and evaporation rate coefficient. The change of the convective heat transfer coefficient has no significant impact on the minimum annual ground temperature.

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“…Kapıcıoğlu et al [31] evaluated the thermal performance of Al 2 O 3 /Ethylene glycol nanofluid in a heat exchanger by considering various volume fractions (0.1 and 0.2). The results indicated that using Al 2 O 3 /ethylene glycol nanofluid increases the thermal performance up to 22% compared to the base fluid.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer and pressure drop in a minichannel heat sink using Al2O3 and TiO2–water nanofluids

Moghanlou

Noorzadeh

Ataei

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Nanofluids are known as a new generation of coolants. These fluids have attracted more attention in cooling applications, like electrical, optical, and solar systems recently, because of their unique rheological and thermal properties. In the present study, to evaluate the thermal behavior of the nanofluids, Al 2 O 3 and TiO 2 nanoparticles with the size of 20 nm were completely dispersed in distilled water and circulated in a minichannel heat sink. The heat sink consists of 10 minichannels that have designed to cool thermoelectric generators. The results showed that by only dispersion of 0.5 vol% Al 2 O 3 nanoparticles a 9.30% heat transfer enhancement observed. It was also obtained that the TiO 2-water sample showed a 4.56% heat transfer enhancement. The highest efficiency was obtained by utilizing the Al 2 O 3-water nanofluid. This was attributed to the higher thermal conductivity of Al 2 O 3 compared to TiO 2. Using both nanofluids resulted in higher pressure drop compared to the based fluid. At the Reynolds number of 1000, the pressure drop for Al 2 O 3 and TiO 2 nanofluids increased as 3.33% and 3.88%, respectively. The increased pressure drop was attributed to higher density and viscosity of nanofluids. The classical theories are not available to justify the remarkable heat transfer enhancement obtained by adding a negligible amount of mentioned nanoparticles. It seems that new mechanisms such as the random motion of nanoparticles and generated microconvections by nanoparticle motion in the base fluid are responsible for considerable heat transfer enhancement.

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Experimental investigation on using Al2O3/ethylene glycol-water nano-fluid in different types of horizontal ground heat exchangers

Cited by 50 publications

References 38 publications

A study on utilization of ground source energy for space heating using a nanofluid as a heat carrier

A study on utilization of ground source energy for space heating using a nanofluid as a heat carrier

Numerical Analysis of Minimum Ground Temperature for Heat Extraction in Horizontal Ground Heat Exchangers

Experimental investigation of heat transfer and pressure drop in a minichannel heat sink using Al2O3 and TiO2–water nanofluids

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