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Research Papers

Evaluating Thermal Performance and Energy Conservation Potential of Hybrid Earth Air Tunnel Heat Exchanger in Hot and Dry Climate—In Situ Measurement

[+] Author and Article Information
Rohit Misra

Mechanical Engineering Department,
Malaviya National Institute of Technology,
Jaipur, Rajasthan 302001, India
e-mail: rohiteca@rediffmail.com

Vikas Bansal

Government Women Engineering College,
Ajmer, Rajasthan 305001, India

Jyotirmay Mathur

Mechanical Engineering Department,
Malaviya National Institute of Technology,
Jaipur, Rajasthan 302001, India

Tarun Aseri

Government Engineering College,
Ajmer, Rajasthan 305002, India

1Corresponding author.

Manuscript received March 25, 2012; final manuscript received September 8, 2012; published online June 24, 2013. Assoc. Editor: Zahid Ayub.

J. Thermal Sci. Eng. Appl 5(3), 031006 (Jun 24, 2013) (9 pages) Paper No: TSEA-12-1041; doi: 10.1115/1.4023435 History: Received March 25, 2012; Revised September 08, 2012

Earth air tunnel heat exchanger is a passive cooling device with advantageous feature to reduce energy consumption in buildings. Curtailing the electricity consumption of conventional vapor compression system based air-conditioner is a major concern especially in area with hot and dry weather conditions. The performance of conventional air-conditioners can substantially be enhanced by coupling these active cooling systems with passive cooling systems. In the present research, the thermal performance and energy conservation potential of hybrid cooling system has been investigated experimentally. An attempt has been made to enhance the thermal performance of active cooling system by coupling it with earth air tunnel heat exchanger (EATHE) in two different hybrid modes. The air which comes out of EATHE is relatively cooler than the ambient air and therefore can be used either for cooling the condenser tubes of a conventional window type air-conditioner or supplying it directly to the room being conditioned. The energy consumption of conventional 1.5TR window type air conditioner is found to be reduced by 16.11% when cold air from EATHE is completely used for condenser cooling.

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References

Figures

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Fig. 7

Hourly temperature and relative humidity recorded in the month of May for different modes

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Fig. 8

Hourly temperature and relative humidity recorded in the month of June for different modes

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Fig. 6

Hourly temperature and relative humidity recorded in the month of April for different modes

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Fig. 5

Hourly temperature and relative humidity recorded in the month of March for different modes

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Fig. 4

Intensity of solar radiation recorded in the month of May–June for different modes

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Fig. 3

Experimental set-up of hybrid EATHE system

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Fig. 2

Weather station for measuring solar radiation, relative humidity and DBT of ambient air

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Fig. 1

Schematic of room integrated with hybrid EATHE system

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