Shade Element Parameter Calculator

The calculator is a tool that facilitates the selection of the appropriate type of shading technology according to its characteristics. It offers the following: The possibility of comparing selected types of shading elements, thus facilitating the selection of the most suitable solution in terms of thermal and visual comfort for the user.

This tool is intended primarily for people dealing with shading technology who know how to properly enter values into the calculator and where to take them from. In particular, for the so-called Custom Assignments, the values are entered, as supplied directly by manufacturers and shading technicians for their products, so they should have had these at their disposal.

The following standards have been used for product calculations and comparisons:

EN ISO 52022-1:2018, Energy performance of buildings - Thermal, solar and daylight properties of building components and elements - Part 1: Simplified calculation method of the solar and daylight characteristics for solar protection devices combined with glazing.
EN 14501:2006, Blinds and shutters - Thermal and visual comfort - Performance characteristics and classification.

Select the product type for calculation. When selecting several types of products, it is possible to compare their properties.

Sorting order	Selected for comparison		Types of solar protection products
Sorting order	Selected for comparison	Product type	Product status	Colour

Glazing specifications

The entered values are used for the calculation for all compared products

Glazing type:

U_g - glazing thermal penetration coefficient (W/m²K):

g - glazing solar energy penetration factor (%):

Comparison table

The displayed values in columns can be sorted by clicking on the column heading.

Order	Glazing D U_g = 1,1 W/m²K g = 32 %			Product property in combination with the selected glazing			Product features			Effect on thermal comfort	Effect on visual comfort
	Glazing D U_g = 1,1 W/m²K g = 32 %									Effect on thermal comfort	Effect on visual comfort
	Product type	Product status	Colour	g_tot	F_c	T_v	τ_e,B	ρ_e,B	α_e,B	Total solar energy penetration coefficient g_tot	Product opacity	Glare protection	Night privacy	Eye contact with the surrounding
Order	Product type	Product status	Colour	g_tot	F_c	T_v	τ_e,B	ρ_e,B	α_e,B	Total solar energy penetration coefficient g_tot	Product opacity	Glare protection	Night privac	Eye contact with the surrounding

Key

F_c - shading factor (according to EN 14501)

With the specified shading parameters in combination with the window, the given element of the shading technology reduces the penetration of solar radiation to the indicated %.

Calculating the shading factor F_c

At the specified shading parameters in combination with the window, the specified % of solar energy will pass to the interior.

T_v - light transmittance factor

At the specified shading parameters in combination with the window, the specified % of daylight will pass from the exterior to the interior.

τ_e,B - transmissivity (transmittance) – solar energy transmissivity factor

The radiation that is transmitted through the shading element to the interior.

ρ_e,B - reflection (reflectance) – reflection factor of solar energy

Radiation that is reflected back to the exterior by the shading element.

α_e,B - absorption (absorbability) – solar energy absorption factor

The radiation that is absorbed by the shading element and increases its temperature.

Effect on thermal and visual comfort

0 = very low influence; 1 = low influence; 2 = moderate influence; 3 = significant influence; 4 = high influence.

Product opacity

There is no perceptible light behind the product with an intensity of up to 10 Lux = 1; 1000 Lux = 2; more than 75,000 Lux = 3.

This calculator was created by an technical team of the SPST (Union of Entrepreneurs in Solar-Shading Technology). Version: 2.1