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BS EN IEC 63092-3 Ed.1.0 Photovoltaics in buildings. - Part 3: Evaluation methodology of SHGC for Building integrated photovoltaic modules with various designs

Source:
IEC
Committee:
GEL/82 - Photovoltaic Energy Systems
Categories:
Solar energy engineering
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Number of comments:
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Scope

This document is intended to provide a versatile method to evaluate the solar heat gain coefficient (SHGC:g value) of BIPV modules with a variety of designs.

The solar heat gain coefficient is known by various names (SHGC, g factor, g value, η value, solar factor, total solar energy transmittance, etc.) depending on the country and region, but here it will be referred to as the g value.

This standard applies to BIPV modules as defined in IEC 63092-1 and specifically to BIPV modules with different effective cell area ratios but comprising identical components such as cells, interconnectors, encapsulation and front/back sheets.

BIPV modules are often custom made and the design qualification is complicated. In particular, g-value measurements for construction components are made on test specimens with dimensions which are different to those specified for PV modules in IEC test standards. Manufacturers and users therefore have an intense demand for a simplified test method requiring a small number of test specimens that provides applicable results to a variety of BIPV modules comprising identical components but varying in the effective cell area ratio. The test method consists of two successive steps, g-value evaluation for BIPV modules with a standard size in the OC and MPP states, and g-value evaluation for transparent reference samples with the same glazing and encapsulant components as the BIPV modules, but without solar cells or interconnectors. By using data for these samples, the g values for any effective PV cell area ratio can be obtained, corresponding to the g values for BIPV modules with the same cell type and glazing configuration, but with different heights, widths and cell configurations.

Thus, this standard addresses the calorimetric determination of the g value for BIPV modules by using the hot box method or the cooled plate method in accordance with ISO 19467 and ISO 19467-2.

Part 1 and Part 2 of this IEC 63092 series describe general requirements for BIPV modules and systems, respectively. Part 3 describes specific requirements for evaluation of the g value for various designs of BIPV modules and provides complementary information to Part 1.

NOTE: An alternative method to determine the g value of BIPV modules is described in prEN 410:2024. It is based on spectral measurements of the optically different components of a BIPV module and the photovoltaic conversion efficiency of the BIPV module.

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