Explicit empirical relation for the monthly average cell‐temperature performance ratio of photovoltaic arrays

Franghiadakis, Y.; Tzanétakis, P.

doi:10.1002/pip.680

Cited by 14 publications

(3 citation statements)

References 6 publications

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“…They determined k ¼ 0.031 C*m 2 /W, via linear regression technique. Krauter [48] reported k equal to 0.03, 0.012, 0.0058 for conventional, upper and lower module in packaged home system, while Franghiadakis and Tzanetakis [49] suggested a formula for the direct estimation of k factor from monthly average values of the wind speed. According to [50] measurements for a PV installation at Chania, most values of "k" were found within the range of 0.02 and 0.06 C*m 2 /W, while the longterm average was equal to 0.04 C*m 2 /W.…”

Section: An Empirical Model To Estimate the Operating Temperature Of mentioning

confidence: 99%

Performance assessment of a thin film photovoltaic system under actual Mediterranean climate conditions in the island of Crete

Savvakis

Tsoutsos

2015

Energy

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Section: An Empirical Model To Estimate the Operating Temperature Of mentioning

confidence: 99%

Performance assessment of a thin film photovoltaic system under actual Mediterranean climate conditions in the island of Crete

Savvakis

Tsoutsos

2015

Energy

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“…The relationship between observed operating conditions, that is, in‐plane irradiation and photovoltaic (PV) module temperature, and PV energy production are on the basis of several PV engineering practices. For example, energy production guaranties use to be established in terms of the Performance Ratio, which is simply an expression of the energy/irradiation ratio and is sometimes corrected in temperature . Obviously, irradiance and module temperature are measured just at one single point (at the corresponding sensor location), whilst PV power output responds to the operating conditions in the large area occupied by the entire PV generator.…”

Section: Introductionmentioning

confidence: 99%

Solar irradiation and PV module temperature dispersion at a large‐scale PV plant

García

Marroyo

Lorenzo

et al. 2014

Progress in Photovoltaics

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When evaluating the performance of a photovoltaic (PV) system, it is extremely important to correctly measure the plant operating conditions: incident irradiation and cell temperature. At large-size PV plants, the possible dispersion of the plant operating conditions may affect the representativeness of the values measured at one single point. The available literature contains many observations on irradiance dispersion (typically associated to high temporal resolution experiments) and its effects on the PV power output (unexpected power transients, power fluctuations, etc.). However no studies have been made on the long-term energy-related effects of geographic dispersion of solar irradiation, which could affect, for example, to the uncertainty in determining energy performance indexes like PR. This paper analyses the geographical dispersion in the PV operating conditions observed at low temporal resolutions (day, month and year) at two PV plants located, respectively, in the south of Portugal and the north of Spain. It shows that daily irradiation deviations are significantly higher than is commonly supposed. Furthermore, once the measurement points are a certain distance apart (a few hundred metres), the deviations in irradiation appear to be independent of distance. This could help to determine how many irradiance sensors to install in order to reduce uncertainty. Daily mean temperature differences between different points at a large-scale PV plant range from 1 to 7 K and are not related to the distance between measurement points.

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“…Empirical expressions which are mainly based on observations and experimental measurements [25,27,28,[35][36][37]. However, these models are optimised to represent the behaviour of the system under observation and difficult to be generalised to describe other systems, which are based on different technologies.…”

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A Novel Method for Thermal Modelling of Photovoltaic Modules/Cells under Varying Environmental Conditions

2020

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Temperature has a significant effect on the photovoltaic module output power and mechanical properties. Measuring the temperature for such a stacked layers structure is impractical to be carried out, especially when we talk about a high number of modules in power plants. This paper introduces a novel thermal model to estimate the temperature of the embedded electronic junction in modules/cells as well as their front and back surface temperatures. The novelty of this paper can be realized through different aspects. First, the model includes a novel coefficient, which we define as the forced convection adjustment coefficient to imitate the module tilt angle effect on the forced convection heat transfer mechanism. Second, the new combination of effective sub-models found in literature producing a unique and reliable method for estimating the temperature of the PV modules/cells by incorporating the new coefficient. In addition, the paper presents a comprehensive review of the existing PV thermal sub-models and the determination expressions of the related parameters, which all have been tested to find the best combination. The heat balance equation has been employed to construct the thermal model. The validation phase shows that the estimation of the module temperature has significantly improved by introducing the novel forced convection adjustment coefficient. Measurements of polycrystalline and amorphous modules have been used to verify the proposed model. Multiple error indication parameters have been used to validate the model and verify it by comparing the obtained results to those reported in recent and most accurate literature.

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Explicit empirical relation for the monthly average cell‐temperature performance ratio of photovoltaic arrays

Cited by 14 publications

References 6 publications

Performance assessment of a thin film photovoltaic system under actual Mediterranean climate conditions in the island of Crete

Performance assessment of a thin film photovoltaic system under actual Mediterranean climate conditions in the island of Crete

Solar irradiation and PV module temperature dispersion at a large‐scale PV plant

A Novel Method for Thermal Modelling of Photovoltaic Modules/Cells under Varying Environmental Conditions

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