Short answer

When selecting semi-transparent photovoltaic glazing for architectural integration, evaluate its performance not just at normal incidence but across a range of angles relevant to the building's orientation, and consider how different color options affect both aesthetics and thermal properties.

Field: Resource Management
Source: Energy Procedia (2015)
Method: Experimental measurement and calculation
Evidence: Strong effect

The solar gain factor of semi-transparent photovoltaic glazing, crucial for building energy performance, is significantly affected by the angle at which sunlight strikes the module and the specific color or shade of the module. This resource management research insight is drawn from a 2015 study published in Energy Procedia. Using Experimental measurement and calculation, researchers explored how this design variable affects real-world outcomes. The key design takeaway: When selecting semi-transparent photovoltaic glazing for architectural integration, evaluate its performance not just at normal incidence but across a range of angles relevant to the building's orientation, and consider how different color options affect both aesthetics and thermal properties.

Study

Resource ManagementHigh ImpactStrong effect

Semi-transparent PV glazing's solar gain factor is influenced by angle of incidence and color variation.

Energy Procedia · 2015

Key Findings

01The solar gain factor of semi-transparent photovoltaic modules varies with the angle of incidence.
02Different color shades of the same photovoltaic technology exhibit distinct optical and thermal properties.
03Accurate optical properties across a range of incidence angles are more relevant for architectural integration than properties measured only at normal incidence.

Application

Design takeaway

How to apply

When designing a building facade with semi-transparent PV elements, use simulation tools that can account for varying angles of incidence and consult manufacturer data that provides performance metrics across a spectrum of conditions, not just standard test conditions.

Project actions

01When testing materials, consider how their properties change with different orientations or angles.
02Document how aesthetic choices (like color) might influence functional performance.

Method & Evidence

AimTo experimentally determine the optical and thermal properties of semi-transparent photovoltaic modules, specifically their solar gain factor, as a function of varying angles of incidence and color.

MethodExperimental measurement and calculation

ProcedureSpectral transmittance and reflectance were measured for photovoltaic modules at multiple angles of incidence (0° to 75°). From these measurements, solar direct transmittance, solar direct reflectance, visible transmittance, and selectivity were calculated. A prototype double glazing unit incorporating these modules was then subjected to solar simulation to measure the temperatures of its surfaces, allowing for the determination of the solar gain factor.

ContextBuilding-integrated photovoltaics (BIPV), architectural design, energy efficiency in buildings

Variables

IV["Angle of incidence of solar radiation","Color/shade of the semi-transparent photovoltaic module"]

DV["Solar gain factor","Spectral transmittance","Spectral reflectance","Visible transmittance","Selectivity"]

CV["Type of photovoltaic technology (dye-sensitized solar cells)","Manufacturer of the modules","Prototype double glazing construction"]

Strengths & Limitations

Strengths

+Experimental determination of key performance metrics.
+Investigation of properties across a range of incidence angles, which is more practically relevant than standard measurements.

Limitations

It can be challenging to accurately replicate all real-world angles of incidence and solar spectrum variations in a controlled experimental setup.

Reliability & validity

The study's validity is enhanced by experimental measurement across multiple angles. Reliability could be assessed by repeating measurements and ensuring consistent calibration of equipment.

Think critically

To what extent do the aesthetic choices in BIPV design compromise or enhance their functional performance, and how can designers balance these competing demands?

Design Principles

"Dynamic performance evaluation: Design elements intended for dynamic environmental conditions (like varying solar angles) must be assessed under those conditions, not just static ones."

For designers integrating photovoltaic elements into building facades, understanding these optical and thermal properties is essential for accurate energy modeling and predicting a building's thermal behavior. This knowledge allows for more informed material selection and design choices to optimize both energy generation and occupant comfort.

What This Means for Your Design

The color and angle of sunlight hitting special solar-powered windows change how much heat they let in, which is important for designing energy-efficient buildings.

How to use in your project

1.Reference this study when discussing the importance of evaluating the optical and thermal properties of BIPV materials beyond standard specifications.
2.Use the findings to justify the need for detailed performance testing for your chosen materials.

Add to My Project

Quick Cite

Paragraph starter

The performance of building-integrated photovoltaic (BIPV) systems, particularly their contribution to a building's thermal load, is significantly influenced by factors beyond simple efficiency ratings. Research indicates that the solar gain factor of semi-transparent photovoltaic modules, such as those based on dye-sensitized solar cells, is sensitive to the angle of incidence of sunlight and the specific color or shade of the module. This suggests that a comprehensive evaluation of BIPV materials should extend beyond standard normal-incidence measurements to encompass a range of angles relevant to architectural application, as different colors can lead to variations in optical and thermal properties that impact overall building energy performance.

Source

Energy Procedia

Experimental Determination of Optical and Thermal Properties of Semi-transparent Photovoltaic Modules Based on Dye-sensitized Solar Cells

journal · 2015

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Questions About This Research

What does the research say about semi-transparent pv glazing's solar gain factor is influenced by angle of incidence and color variation?: When selecting semi-transparent photovoltaic glazing for architectural integration, evaluate its performance not just at normal incidence but across a range of angles relevant to the building's orientation, and consider how different color options affect both aesthetics and thermal properties. Evidence: Energy Procedia (2015).
Why does "Semi-transparent PV glazing's solar gain factor is influenced by angle of incidence and color variation." matter for design?: For designers integrating photovoltaic elements into building facades, understanding these optical and thermal properties is essential for accurate energy modeling and predicting a building's thermal behavior. This knowledge allows for more informed material selection and design choices to optimize both energy generation and occupant comfort.
How can designers apply this research?: When selecting semi-transparent photovoltaic glazing for architectural integration, evaluate its performance not just at normal incidence but across a range of angles relevant to the building's orientation, and consider how different color options affect both aesthetics and thermal properties.
What were the main findings?: The solar gain factor of semi-transparent photovoltaic modules varies with the angle of incidence.. Different color shades of the same photovoltaic technology exhibit distinct optical and thermal properties.. Accurate optical properties across a range of incidence angles are more relevant for architectural integration than properties measured only at normal incidence.
What research method was used?: Experimental measurement and calculation.
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2015 journal from Energy Procedia.
What should I do differently in my next project?: When designing a building facade with semi-transparent PV elements, use simulation tools that can account for varying angles of incidence and consult manufacturer data that provides performance metrics across a spectrum of conditions, not just standard test conditions.
What are the limitations?: The study focused on a specific type of photovoltaic technology (dye-sensitized solar cells) and a limited range of colors. Performance may vary with different PV technologies and module constructions.