Effect of evapotranspiration on performance improvement of photovoltaic-green roof integrated system

Authors

  • Souradeep Gupta Department of Building, School of Design and Environment, National University of Singapore
  • Prashant Anand Department of Building, School of Design and Environment, National University of Singapore
  • Suveera Kakkar Department of Building, School of Design and Environment, National University of Singapore
  • Pratyusha Sagar Department of Building, School of Design and Environment, National University of Singapore
  • Akanksha Dubey Department of Building, School of Design and Environment, National University of Singapore

Keywords:

PV output, green roof, PV cell temperature, PV efficiency, evapotranspiration

Abstract

The purpose of the research is to evaluate performance improvement of photovoltaic (PV) integrated with green roof system due to evapotranspiration from plants. Evapotranspiration rate (ET) has been modeled by regression method to calculate latent heat flux generated which is responsible for reduction of cell temperature and improving efficiency of PV on green roof. ET rates have been generated by using developed regression model and its effect on power output and cell temperature was studied.  Experimental results showed that power output of PV-green roof system can be higher than reference PV installed on bare concrete roof by about 8.60% whereas maximum improvement in efficiency can be up to 3%. It is found that ET plays significant role in reducing cell temperature and improving output on days with clear sky and fairly high and constant solar irradiance. However, ET rate may fluctuate on days when irradiance level is low due to which the efficiency and power output improvement of PV-green roof system may be minimal compared to PV on bare concrete roof.

References

Hui, S. C. and S. Chan, "Integration of green roof and solar photovoltaic systems," Joint symposium, (2011).

Witmer, L., "QUANTIFICATION OF THE PASSIVE COOLING OF PHOTOVOLTAICS USING," The Pennsylvania State University, (2010).

Nagengast, A., C. Hendrickson and H. S. Matthews, "Variations in photovoltaic performance due to climate and low-slope roof choice," Energy and Buildings, 64 (2013) 493-502.

Chemisana, D. and C. Lamnatou, "Photovoltaic-green roofs: An experimental evaluation of system performance," Applied Energy 119 (2014) 246-256.

Scherba, A., D. J. Sailor, T. N. Rosenstiel and C. C. Wamser, "Modeling impacts of roof reflectivity, integrated photovoltaic panels and green roof systems on sensible heat flux into the urban environment," Building and Environment 46(12) (2011) 2542-2551.

Perez, M. J., N. Wight, V. Fthenakis and C. Ho, "Green-Roof Integrated PV Canopies–an Empirical Study and Teaching Tool for Low Income Students in the South Bronx," (2012) detail 4: 6.

Smithson, P., K. Addison and K. Atkinson, Fundamentals of the physical environment, Psychology Press, (2002).

Allen, R. G., L. S. Pereira, T. A. Howell and M. E. Jensen, "Evapotranspiration information reporting: I. Factors governing measurement accuracy," Agricultural Water Management, 98(6) (2011) 899-920.

Gausman, H. and W. Allen, "Optical parameters of leaves of 30 plant species." Plant Physiology, 52(1) (1973) 57-62.

Wong, N., S. K. Jusuf, A. A. La Win, H. K. Thu, T. S. Negara and W. Xuchao, "Environmental study of the impact of greenery in an institutional campus in the tropics," Building and environment, 42(8) (2007) 2949-2970.

Schwingshackl, C., M. Petitta, J. E. Wagner, G. Belluardo, D. Moser, M. Castelli, M. Zebisch and A. Tetzlaff, "Wind effect on PV module temperature: analysis of different techniques for an accurate estimation," Energy Procedia 40 (2013) 77-86.

Ranney, T. G. and M. M. Peet, "Heat tolerance of five taxa of birch (Betula): Physiological responses to supraoptimal leaf temperatures," Journal of the American Society for Horticultural Science 119(2) (1994) 243-248.

Bassow, S., K. McConnaughay and F. Bazzaz, "The Response of Temperate Tree Seedlings Grown in Elevated CO2 to Extreme Temperature Events," Ecological applications, (1994) 593-603.

HENDARTI, R., The influence of the evapotranspiration process of green roof tops on PV modules in the tropics (2013).

Downloads

Published

21 June 2017

How to Cite

Gupta, S., Anand, P., Kakkar, S., Sagar, P., & Dubey, A. (2017). Effect of evapotranspiration on performance improvement of photovoltaic-green roof integrated system. Journal of Renewable Energy and Smart Grid Technology, 12(1), 63–76. Retrieved from https://ph01.tci-thaijo.org/index.php/RAST/article/view/90334

Issue

Vol. 12 No. 1 (2017): January - June 2017

Section

Articles

License

All copyrights of the above manuscript, including rights to publish in any media, are transferred to the SGtech.

The authors retain the following rights;

            1. All proprietary rights other than copyright.

            2. Re-use of all or part of the above manuscript in their work.

            3. Reproduction of the above manuscript for author’s personal use or for company/institution use provided that

            (a) prior permission of SGtech is obtained,

            (b) the source and SGtech copyright notice are indicated, and

            (c) the copies are not offered for sale.