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Research Papers

Thermal Modeling of a Rooftop Photovoltaic/Thermal System With Earth Air Heat Exchanger for Combined Power and Space Heating

[+] Author and Article Information
Sanjeev Jakhar

Centre for Renewable Energy and
Environment Development (CREED),
Department of Mechanical Engineering,
Birla Institute of Technology and Science Pilani,
Pilani Campus,
Pilani 333031, Rajasthan, India
e-mails: sanjeevj450@gmail.com;
sanjeev.jakhar@pilani.bits-pilani.ac.in

Manoj S. Soni

Centre for Renewable Energy and
Environment Development (CREED),
Department of Mechanical Engineering,
Birla Institute of Technology and Science Pilani,
Pilani Campus,
Pilani 333031, Rajasthan, India
e-mail: mssoni@pilani.bits-pilani.ac.in

Robert F. Boehm

Center for Energy Research,
University of Nevada,
Las Vegas, NV 89154-4027
e-mail: bob.boehm@unlv.edu

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received August 1, 2017; final manuscript received January 1, 2018; published online March 13, 2018. Assoc. Editor: Ming Qu.

J. Sol. Energy Eng 140(3), 031011 (Mar 13, 2018) (15 pages) Paper No: SOL-17-1315; doi: 10.1115/1.4039275 History: Received August 01, 2017; Revised January 01, 2018

Earth air heat exchanger (EAHE) systems are inefficient to provide thermal comfort in winter season for semi-arid regions. The performance of such systems could be improved by coupling them with other renewable energy sources. One of the renewable energy technology is rooftop photovoltaic/thermal (PV/T) air collectors which could utilize the incident solar insolation to obtain both electricity as well as useful heat. In the current paper, the thermal performance of an EAHE coupled with a PV/T system has been numerically investigated for climatic conditions of Pilani, Ajmer (India), and Las Vegas (U.S.). For the comparative analysis, a thermodynamic model has been developed and compared with experimental data available in the literature which seems to be in good comparison with the results. Further, a parametric analysis has been carried out for assessing the effect of different operating parameters. Results showed that for the winter season, the maximum cell temperature without any cooling goes up to 54.3 °C, 54.5 °C, and 44.4 °C for Pilani, Ajmer, and Las Vegas, respectively, while with cooling it drops to 43.4 °C, 44.2 °C, and 35.6 °C, respectively, for 0.053 kg/s flow rate. The heating capacity of the EAHE was observed to be improved with PV/T air collector by 23.47 Wh–298.74 Wh, 71.18 Wh–315.93 Wh, and 41.43 Wh–270.75 Wh for the Pilani, Ajmer, and Las Vegas, respectively.

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Figures

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Fig. 1

Schematic diagram of the proposed PV/T coupled with the EAHE system

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Fig. 2

Thermal resistance circuit diagram for PV/T air system

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Fig. 3

Ambient conditions during experimental study of Tiwari et al. [8]

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Fig. 4

Validation of simulated and experimental results of PV/T air system

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Fig. 5

Variation of solar radiation and ambient temperature for the conditions of Pilani, Ajmer, and Las Vegas

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Fig. 6

Solar cell temperature with and without cooling for Pilani with different mass flow rates

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Fig. 7

Solar cell temperature with and without cooling for Ajmer with different mass flow rates

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Fig. 8

Solar cell temperature with and without cooling for Las Vegas with different mass flow rates

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Fig. 9

Electrical and overall efficiency of PV/T system with and without cooling for Pilani for various flow rates

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Fig. 10

Electrical and overall efficiency of PV/T system with and without cooling for Ajmer for various flow rates

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Fig. 11

Electrical and overall efficiency of PV/T system with and without cooling for Las Vegas for various flow rates

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Fig. 12

Earth air heat exchanger and PV/T outlet temperature for Pilani for various flow rates

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Fig. 13

Earth air heat exchanger and PV/T outlet temperature for Ajmer for various flow rates

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Fig. 14

Earth air heat exchanger and PV/T outlet temperature for Las Vegas for various flow rates

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Fig. 15

Photovoltaic/thermal outlet and cell temperature for various channel depths with mass flow rate of 0.053 kg/s on January18

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Fig. 16

Photovoltaic/thermal outlet and cell temperature for various EAHE pipe lengths with mass flow rate of 0.053 kg/s on January 18

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Fig. 17

Photovoltaic/thermal outlet and cell temperature for various PV/T collector lengths with mass flow rate of 0.053 kg/s on January 18

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