CFD analysis of EATHE system under transient conditions for intermittent operation

Mathur, Anuj; Srivastava, Ayushman; Agrawal, Ghanshyam Das; Mathur, Sanjay; Mathur, Jyotirmay

doi:10.1016/j.enbuild.2014.11.022

Cited by 59 publications

(14 citation statements)

References 20 publications

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“…It is observed from the Fig. 4 that the maximum deviation in the temperature profile achieved by present simulation model and numerical model of Mathur et al (2015) is 0.7 °C along the pipe length. There is a good agreement between the previously published and present simulation model, and hence, the proposed CFD model is suitable for further analysis.…”

Section: Validation Of Simulation Modelmentioning

confidence: 67%

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Optimization of operating parameters of earth air tunnel heat exchanger for space cooling: Taguchi method approach

Agrawal

Bhardwaj

Misra³

et al. 2018

Geotherm Energy

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Background The significance of renewable energy is increasing due to depletion of fossil fuels and rise in fossil fuels prices. In last 2 decades, the energy demands in buildings have raised significantly due to increasing living standards and population. Space cooling and heating utilized about 33% of total energy consumption world over (Nejat et al. 2015; Omer 2008). The conventional cooling and heating systems are energy intensive. Therefore, many countries are adopting passive and low-grade energy systems for cooling and heating of buildings. Earth air tunnel heat exchanger (EATHE) system uses earth as a heat source/sink to transfer heat to/from fluid flowing through the buried pipes. At a depth of 3-4 m, soil temperature remains constant round the year, and when the air is passed through buried EATHE pipe, it produces a heating effect in winter and cooling effect in summer (Bansal et al. 1983; Bansal and Sodha 1986; Bharadwaj and Bansal 1981; Wang et al. 2009). The working principle of EATHE system is shown in Fig. 1.

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Section: Validation Of Simulation Modelmentioning

confidence: 67%

“…The developed CFD model has been validated against numerical results obtained by Mathur et al (2015). It is observed from the Fig.…”

Section: Validation Of Simulation Modelmentioning

confidence: 99%

Optimization of operating parameters of earth air tunnel heat exchanger for space cooling: Taguchi method approach

Agrawal

Bhardwaj

Misra³

et al. 2018

Geotherm Energy

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“…This response time is faster than that of various expensive substrate materials such as graphene on polyethylene naphthalate (PEN) 11 and Ag NW on a ultra-thin glass 54 . This fast response is also attributed to the efficient heat transfer to the polymer substrate and low volumetric heat capacity of PVC 55 .…”

Section: Flexible and Wearable Heaters For Thermotherapymentioning

confidence: 99%

Flexible and multifunctional electronics fabricated by a solvent-free and user-friendly method

et al. 2016

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Flexible and multifunctional electronic devices have been proven to show potential for various applications including human-motion detection and wearable thermal therapy. The key advantages of these systems are (1) highly stable, sensitive and fast-response devices, (2) fabrication of macroscale devices on flexible substrates, and (3) integrated (lab-on-chip) and multifunctional devices. However, their fabrication commonly requires toxic solvents, as well as time-consuming and complex processes. Here, we demonstrate the low-cost, rapid-prototyping and userfriendly fabrication of flexible transducers using recyclable, water-resistant poly(vinyl chloride) films as a substrate, and ubiquitously available pencil graphite as a functional layer without using any toxic solvents or additional catalysts. The flexible heaters showed good characteristics such as fast thermal response, good thermostability (low temperature coefficient of resistance) and low power consumption. The heaters with their capability of perceiving human motion were shown to be effective. The proof of concept of other functional devices such as vibrationbased droplet sensors and drag-force air flow sensors was also demonstrated. Results from this study indicate that a wide range of electronic devices fabricated from the environmental-friendly material by this simple and user-friendly approach could be utilized for cost-effective, flexible and low power consuming thermal therapy, health monitoring systems and other real-time monitoring devices without using any toxic chemicals or advanced processes.

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“…Xamán et al discussed the effect of thermal insulation at the outlet section of the EAHE. From the results, they concluded that the performance of the EAHE improved with an insulation thickness of 0.05 m. Mathur et al showed that the soil temperature around the pipe depends on the thermal conductivity of soil where the soil with a lower thermal conductivity will saturate at a faster compared to the soil with a higher thermal conductivity. Kaushal et al presented a 2D simulation model.…”

Section: Introductionmentioning

confidence: 99%

Parametric study on the performance of the earth‐to‐air heat exchanger for cooling and heating applications

Hasan

Noori

Shkarah

2019

Heat Trans. Asian Res.

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To reduce energy consumption, the earth-to-air heat exchanger (EAHE) is a suitable technique for cooling and heating buildings. This paper studies numerically the effect of some design parameters (pipe diameter, inlet condition, pipe length, and outlet condition) on the overall performance of the EAHE system. Four diameters of the EAHE pipe (2, 3, 4, and 6 in) are studied and this numerical study has been done for summer and winter seasons for Nasiriyah city in southern Iraq. First, the built numerical model was validated against the experimental model, and the results of comparison showed a good consensus. After the validation and by using computational fluid dynamics modeling, the overall performance of the EAHE system with all pipe diameters was analyzed with ranges of air velocity, DBT or inlet temperature, and a pipe length of 50 m. The simulated results showed that the EAHE system with 6 in pipe diameter has the best values of overall performance, but from the thermal performance point of view, the 2 in pipe diameter is more suitable. K E Y W O R D S computational fluid dynamics, earth-to-air heat exchanger system, geothermal energy, numerical investigation, thermal performance Heat Transfer-Asian Res. 2019;48:1805-1829.wileyonlinelibrary.com/journal/htj

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CFD analysis of EATHE system under transient conditions for intermittent operation

Cited by 59 publications

References 20 publications

Optimization of operating parameters of earth air tunnel heat exchanger for space cooling: Taguchi method approach

Optimization of operating parameters of earth air tunnel heat exchanger for space cooling: Taguchi method approach

Flexible and multifunctional electronics fabricated by a solvent-free and user-friendly method

Parametric study on the performance of the earth‐to‐air heat exchanger for cooling and heating applications

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