Exergy analysis of a flat plate solar collector with latent heat storage by phase change material for water heating applications at low temperature

Authors

DOI:

https://doi.org/10.25034/ijcua.2018.3678

Keywords:

Thermal energy storage, Phase change material, Exergy analysis, Flat plate solar collector

Abstract

An exergy analysis has been performed to determine the potential for useful work in a latent heat storage system with phase change material (PCM) for a flat-plate solar collector. Commercial paraffin wax is used as PCM to store and release energy in the solid-liquid transformation; this material is located in metal containers under the absorber plate on the bottom insulation of the collector. The exergy analysis is performed in outdoor conditions for days of the low, medium and high radiation taken from October 2016 to March 2017 at Barranquilla city (latitude: 10º 59' 16" N, longitude: 74º 47' 20" O, Colombia). The system is evaluated throughout charge and discharge periods. The energy and exergy balance equations based on the first and second law of thermodynamics is formulated and solved for each element of the collector system as well as for the PCM. Results obtained show the energy distribution and energetic destruction for each system component and its variation as a time function. It was observed that the average energy and energetic efficiency are 28.7 %, 13.2 % for of low radiation days. 26.9%, 20.56% for of medium radiation days, and 23.2%, 18.6% for of high radiation days, respectively. Results of the analysis are shown in detail in the present paper.

Downloads

Download data is not yet available.

References

Oliver, A., Neila, F. J., García-Santos ,A.(2010). PCM choosing and classification according to their characteristics for their application for thermal energy storage systems. Materiales de construccion , 62, 131-140.

Kocaa,A., Oztop,H.F., Koyun, T., Varol,Y. (2007). Energy and exergy analysis of a latent heat storage system with phase change material for a solar collector. Renewable Energy ,33, 567-574.

Nkwetta, D.N., Haghighat,F. (2014). Thermal energy storage with phase change material- A state of the art review. Sustainable Cities and Society,10, 87-100.

Jafarkazemi,F., Ahmadifard,E. (2013). Energetic and exergetic evaluation of flat plate solar. Renewable Energy,56, 55-63.

Kalogirou,S.A.(2004). Solar thermal collectors and applications. Progress in Energy and Combustion Science, 30(3), 231-295.

Li, G. (2015). Energy and exergy performance assessments for latent heat thermal energy storage systems. Renewable and Sustainable Energy Reviews,15, 926-954.

Asbik.M., Ansari,O.,Bah,A., Zari,N., Mimet,A.,El-Ghetany,H.(2016). Exergy analysis of solar desalination still combined with heat storage system using phase change material (PCM). Desalination ,381, 26-37.

Moran, M. J.,Shapiro, H. N.(Ed.). (2004). Fundamentals of Engineering Thermodynamics.(4th ed.) .Barcelona: Reverté, S.A.

Petela, R. (1964). Exergy of Heat Radiation. J. Heat Transfer,86(2).187-192.

Jegadheeswaran,S., Pohekar, S.D., Kousksou,T.(2010). Exergy-based performance evaluation of latent heat thermal storage system: A review. Renewable and Sustainable Energy Reviews ,14(9),2580-2595.

Kalogirou,S.A., Karellas,S.,Braimakis,K., Stanciu,C., Badescu,V. (2016). Exergy analysis of solar thermal collectors and processes. Progress in Energy and Combustion Science ,56, 106-137.

Downloads

Published

2017-12-28

How to Cite

Ortega, A. R., & Carmona, M. (2017). Exergy analysis of a flat plate solar collector with latent heat storage by phase change material for water heating applications at low temperature. Journal of Contemporary Urban Affairs, 1(3), 43–48. https://doi.org/10.25034/ijcua.2018.3678