Blinds

Blinds

CL BS EPG
This allows you to choose whether or not to install regular sun protection by the window. When you turn on the check box for sun blinds, all of the following settings appear. This setting applies regardless of a normal window or climate window.

With the placement there is a choice of:

•     Outside: Sun blinds placed on the outside of the window such as screens

•     Between panes: Blinds placed in or between the windows such as blinds.

•     Inside: Sun blinds placed on the inside of the window

Control

CL BS
The control gives a choice how to control the sunblind. You can then define this choice at the blinds switch level under the building control building template.

Pay attention! This setting is linked to Building Operations> Blinds control settings.

•     Manual; the sunblind is controlled manually. Depending on the setting under Building Regulations, this can be continuously open, continuously closed or controlled via a certain switching level.

•     Automatically; the sunblind is regulated automatically. Depending on the setting under Building Regulations, this can be continuously open, continuously closed or controlled via a certain switching level.

Type

Enter the type of blinds here. There is a difference between inside and between / outsideblinds. You can choose from the following types:

Outside- en tussen blinds

Binnen zonwering

Establishment of sun protection values

In collaboration with blinds suppliers, standard blinds types have been determined that you can choose from; poor, moderate or good. The current market values have been applied to these categories as specifications. The order from good to bad is based on the g-value in combination with HR ++ glass. The g value represents the ratio between the incident solar radiation and the incoming solar radiation. The lower the g value, the less solar heat enters the building.

With blinds, the most important factor is the transmission, or transmission, of energy. With good blinds, this value will be low and high with poor blinds. There is also a difference between inside and outside sun blinds.

With blinds, the degree of reflection is important, while a higher reflection ensures a lower transmission of energy. With solar shading, it is not desirable to have high absorption, because you then create large areas of radiation.

With outdoor blinds, the absorption is less important, because the absorbed heat does not radiate inwards. As a result, the value for absorption, as opposed to inside solar protection, can be higher.

Transmission energy

CL BS
This is the direct energy transmission [α_e, TE%] and indicates the percentage of energy that is transmitted through the glass. This is the part of the directly transmitted solar energy, in other words the transmitted solar radiation

If the transmission [τe] is not known, but the absorption [αe] and energy reflection [ρe] are, then the value of the transmission can be deduced from the following formula:

.

Absorption energy

CL BS
Energy absorption [α_e, AE1%+AE2%] is the part of the solar energy absorbed by the glass. This glass property must be measured in accordance with NEN-EN 410: 2011.

If the absoprtion [α_e] is not known, but the absorption [τ_e] and energy reflection [ρ_e] are, then the value of the transmission can be deduced from the following formula:
.

Tranmission light (LTA)

CL BS
This is the light entry factor [[τ_v, TL%] or light transmission and gives the ratio between the incoming and the striking visible solar radiation with a perpendicular angle of incidence. This coefficient is used to determine the light in the room and is used to switch the lighting. The higher the LTA value, the more visible light and heat enters. This glass property must be measured in accordance with NEN-EN 410: 2011.

Reflection light

CL BS
The visible reflection [ρ_v, RLe%], or light reflection, indicates the percentage of visible light that is reflected by the glass. The higher the reflection, the more light is reflected. This glass property must be measured in accordance with NEN-EN 410: 2011.

Make sure that the light reflection [ρ_v] is different from the energy reflection [ρ_e] of glass.

Convection factor artificial light

CL
If there are indoor blinds, the convection factor for artificial light can be entered. The heat radiation from the artificial light ensures that the indoor sun protection heats up and also radiates heat again. The influence of the convection factor also depends on the specified illuminance.

Window had fixed outdoor blinds

EPG
Fixed outdoor sun protection is an option that can only be applied for an EPG calculation. This concerns outside sun protection that is always present. With fixed awning (as with scattering glazing) the time-average sun glare factor g_gl is used and this is calculated from the specified g value at sun height 45º and the g value for isotropic diffuse solar radiation.

Window has dispersive glazing

EPG
Scattering glazing is an option that can only be used for an EPG calculation. In the case of scattering glazing, the time-average solar entry factor ggl is used and this is calculated from the specified g value at sun height 45º and the g_g value for isotropic diffuse solar radiation.

Solar factor, g-value (45º)

EPG
The g value of the glass as determined at a sun height of 45º. This value can be specified if fixed external sun protection or scattering glazing is chosen, and this is used for the calculation of the g_gl value.

Solar factor, g-value isotropic diffuse

EPG
The g value for isotropic diffuse solar radiation determined in accordance with ISO 15099. This value can be specified if fixed external sun protection or scattering glazing has been chosen, and this is used for the calculation of the g_gl value.

Dutch climate facade