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research-article

Evaluating applicability 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, Rajasthan, India 333031
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, Rajasthan, India 333031
mssoni@pilani.bits-pilani.ac.in

Dr. Robert F. Boehm

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

1Corresponding author.

ASME doi:10.1115/1.4039275 History: Received August 01, 2017; Revised January 01, 2018

Abstract

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 utilized 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 (USA). 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, 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 to 298.74 Wh, 71.18 Wh to 315.93 Wh and 41.43 Wh to 270.75 Wh for the Pilani, Ajmer and Las Vegas respectively.

Copyright (c) 2018 by ASME
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