Photovoltaic Roof Tiles: The Influence of Heat Recovery on Overall Performance

Wajs, Jan; Gołąbek, Aleksandra; Bochniak, Roksana

doi:10.3390/en12214097

Cited by 16 publications

(11 citation statements)

References 22 publications

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“…Subsequent measurements were made only for the modified PV module with ventilated built-up space. The heat flux (q), which can be obtained for the given solar irradiance (G), and the volumetric flow rate of air (𝑉 ), was calculated from the Equation (2) [18]:…”

Section: Resultsmentioning

confidence: 99%

“…The heat flux (q), which can be obtained for the given solar irradiance (G), and the volumetric flow rate of air ( . V), was calculated from the Equation (2) [18]:…”

Section: Resultsmentioning

confidence: 99%

“…where ρ is the average air density between the inlet and outlet temperature, c is the average air-specific heat between the inlet and outlet temperature, ∆T is the outlet and inlet air temperature difference (∆T = T out − T in , see Figure 1). The photothermal conversion efficiency (η th ) was calculated from the Equation (3) [18]:…”

Section: Resultsmentioning

confidence: 99%

“…Other studies analyzed and compared the effect of air cooling on the performance of PV modules [15][16][17]. The PV roof tile was also investigated [18,19], and the main aim of the study was to increase the overall system efficiency by using heat recovery. A common conclusion from the cited studies was to increase the efficiency of PV elements using any cooling method.…”

Section: Introductionmentioning

confidence: 99%

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The Efficiency of Obtaining Electricity and Heat from the Photovoltaic Module under Different Irradiance Conditions

Sarniak

2021

Energies

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This paper proposes a modification to the design of a standard PV module by enclosing the skeleton space and using forced ventilation. The purpose of this research was to develop a method for calculating the amount of heat gained during PV module cooling. A simplifying assumption was to omit the electrical energy consumed by the fans forcing the airflow. For testing at low irradiance, a prototype halogen radiation simulator of our own design was used, which is not a standardized radiation source used for testing PV modules. Two measurements were also made under natural, stable solar radiation. The modified PV module was tested for three ventilation rates and compared with the results obtained for the standard PV module. In all tested cases, an increase in electrical efficiency of about 2% was observed with increasing radiation intensity. The thermal efficiency decreased by about 5% in the analyzed cases and the highest value of 10.47% was obtained for the highest value of cooling airflow rate. In conclusion, the study results represent a certain compromise: an increase in electrical efficiency with a simultaneous decrease in thermal efficiency.

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Section: Resultsmentioning

confidence: 99%

“…The heat flux (q), which can be obtained for the given solar irradiance (G), and the volumetric flow rate of air ( . V), was calculated from the Equation (2) [18]:…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Efficiency of Obtaining Electricity and Heat from the Photovoltaic Module under Different Irradiance Conditions

Sarniak

2021

Energies

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“…Moreover, studies were conducted analyzing the impact of meteorological data on electricity production forecasting [37]. Studies were also conducted on more technologically advanced pv systems, with the ability to store generated electricity [38] or the systems based on photovoltaic roof tiles [39].…”

Section: State Of the Artmentioning

confidence: 99%

Analysis of the Impact of the Assumed Moment of Meeting Total Energy Demand on the Profitability of Photovoltaic Installations for Households in Poland

Iwaszczuk

Trela

2021

Energies

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In this article, the authors analyzed two extreme investment variants considering the installed capacity of Poland’s residential pv installation: (a) pv installation meets electricity demand only in the first year of operation, and in each subsequent year it is necessary to purchase electricity at market prices; (b) installation meets electricity demand even in the last year of operation, and in each previous year, the excess of generated electricity needs to be transferred back to the grid, with the limited (by law) right of drawing it from the grid for free in the future. In the article, a sensitivity analysis was performed, and profitability changes were established based on the NPV value, depending on case (a) or (b). The performed analyses showed that the pv installation profitability should not be analyzed, assuming only one moment when it meets 100% of the household’s electricity demand. It was shown that the choice of such a moment, depending on the value of particular technical and financial parameters, can lead to a change in the NPV value, even over 10%. Although the studies were done for Poland, such an approach can be implemented in other countries.

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