Determination of pipe wall temperature in a slinky-coil ground heat exchanger

Larwa, Barbara; Kupiec, Krzysztof

doi:10.1016/j.ijheatmasstransfer.2020.120202

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…Xiong et al [4] introduced the analytical solution of ground temperature variation and mean temperature of the tube wall after injecting a constant heat to the ground in slinky GHX. Later, Larwa and Kupiec [5] extended the same model and suggested the correlations for temperature of fluid and pipe. Babak Deghan [6] investigated long-term thermal performance of a vertical spiral ground heat exchanger using numerical and experimental techniques.…”

Section: Introductionmentioning

confidence: 96%

Experimental Analysis of Soil Recovery and Heat Interactions with Ground in Slinky Connected Split Air-Conditioning System

Kumar,

Krishnan

2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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In the present research work experimental analysis of soil recovery and heat interaction of slinky ground heat exchanger connected with a split air-conditioning system has been reported. For the analysis a 1.5-ton cooling capacity split air-conditioning system coupled with a slinky type of heat exchanger was deployed at IIT Roorkee campus, India. All the experiments were carried in peak summer conditions during space cooling mode operation. Initially, the heat interaction through the GHX to the ground is analysed throughout the experiments, later once the experiments are over, the ground temperature is monitored to estimate the soil recovery period by circulating water in the GHX. For the present location, several experimental trials were carried out and recorded the soil recovery period for different operating hours. A regression analysis is performed to stablish a correlation between the soil recovery period and the operating hours. The rate of heat rejection to the ground varies from 5 to 8 kW on a typical day in peak summer condition. The ratio of soil recovery and the operating hours is observed to be more than 1 when ground coupled split air-conditioning system is operated from 5 to 12 hours in daytime. Operating the split air-conditioning system for more than 12 hours shows a lesser recovery time as compared to the operating hours due to partial recovery of the ground during lesser cooling load during the nighttime.

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Section: Introductionmentioning

confidence: 96%

Experimental Analysis of Soil Recovery and Heat Interactions with Ground in Slinky Connected Split Air-Conditioning System

Kumar,

Krishnan

2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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“…A dense slinky loop displayed an average 1.5°C temperature lower than a horizontal straight loop and a slinky loop (which were nearly the same). Larwa and Kupiec [7] conducted numerical simulations to calculate the pipe wall temperatures of a slinkytype GHE consisting of several linked rings. They compared the results with those of a simplified case and found that the differences were not significant.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis the thermal performance of slinky-type of horizontal geothermal heat exchanger equipped with turbulator

Mousavi Ajarostaghi,

Poncet,

Amiri

et al. 2023

Progress in Canadian Mechanical Engineering. Volume 6

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Among several kinds of heat exchangers, borehole (ground) heat exchangers have a prominent place in application of renewable energy systems to supply energy. Recently, there has been noteworthy improvement in new methods of modeling and analyzing such systems. This development is the outcome of several empirical and theoretical researches in the thermal performance enhancement of ground heat exchangers (GHEs). Various methods have been employed to arrange the pipes of GHEs, both horizontally and vertically. Among these methods, the horizontal arrangement has proven to be the most cost-efficient option for the project. Slinky-type GHEs have become very common because they require a smaller footprint compared to conventional GHEs. One effective method to improve heat transfer in heat exchangers is to use a turbulator as an efficient passive method. By creating swirling flows in the heat exchanger, the amount of heat transfer increases. In the present work, the thermal performance of a Slinky-type GHE equipped with twisted tape as swirl generator or turbulator is numerically evaluated. The studied range of the inlet flowrate is 0.25-1 kg/s. Numerical simulation was performed using commercial finite volume method (FVM) code, ANSYS Fluent 18.2. The variable parameters in the present work are the pitch of the twisted tape, P, varied from 200 to 400 mm, as well as the mass flowrate varied from 0.25 to 1 kg/s. The numerical results indicate that, for all considered mass flowrates, the case with a pressure of 200 mm achieves the highest thermal performance. Additionally, it is worth noting that the maximum thermal performance is achieved at a mass flowrate of 0.5 kg/s in all the cases studied.

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“…Coiled GHEs have also been considered as enhancements of the conventional 4 types to decrease the volume of installations. These could be installed in the form of spiral [19] or slinky [20] shape. EAHE is simpler than that of GSHP since it only utilizes an underground duct to circulate air and supply it to the conditioned space via a blower [21,22].…”

Section: Introductionmentioning

confidence: 99%

An investigation on organic Rankine cycle incorporating a ground-cooled condenser: Working fluid selection and regeneration

Mahmoud

Alkhedher

Ramadan

et al. 2022

Energy

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Determination of pipe wall temperature in a slinky-coil ground heat exchanger

Cited by 8 publications

References 17 publications

Experimental Analysis of Soil Recovery and Heat Interactions with Ground in Slinky Connected Split Air-Conditioning System

Experimental Analysis of Soil Recovery and Heat Interactions with Ground in Slinky Connected Split Air-Conditioning System

Numerical analysis the thermal performance of slinky-type of horizontal geothermal heat exchanger equipped with turbulator

An investigation on organic Rankine cycle incorporating a ground-cooled condenser: Working fluid selection and regeneration

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