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Cool materials combined with PV cells

Kotenidis Konstantinos-Andreas

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Summary

The present thesis, aims at the study of cool roof materials and their combination with photovoltaic cells. More specifically, cool roofs are able to offer many advantages to the building, which is under study, as well as is shown of their ability to reduce the roof temperature, and therefore the outcome is the cost reduction of the thermal zones underneath them, while in addition they extend the roof’s lifespan. It also seems, they have a positive effect on photovoltaic panels, they reduce their temperature by cooling the surrounding environment and due to this reduction, photovoltaics can produce more power of the power which is produced when they are mounted on a conventional roof.Initially, OpenStudio and EnergyPlus were used to build the models, in which a simple concrete roof was built, a roof with the addition of Elastokryl and finally the third model was a roof with the addition of Sikalastic-560. Through these three models, the first assessment was made of the effect of these two cool materials. Then, the same models were moved and made from the beginning in TRNSYS software (Transient System Simulation Tool), where four different photovoltaic modules were added on each roof and the simulation was done for each one separately. The four different modules of the photovoltaic cells which were used are from SunPower Corporation the SPR-X21-345 module, the REC350TP2S-72 module of REC Solar Holdings SA, the MiaSolé FLEX-03 500W of MiaSolé company and the last one is a product of First Solar, Inc., the FS-6450A.After these simulations, the results were compared for each roof separately and for each module also separately and how these four photovoltaics were affected by each roof material for three different days of the year, one during winter, one during summer and one where the maximum irradiance on the horizontal was measured, and for each comparison is presented the percentage in addition to the graphical comparison.The last part of this thesis is the mathematical modelling of these four modules in MATLAB/Simulink, where is simulated the power production for each of their temperatures and for each value of the incident radiation, which values were extracted from TRNSYS. In addition, their comparisons are presented and for each simulation the results are positive for winter day, summer day and for the day with the maximum incidence of irradiance is measured.

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