Glass that stores, heats and cools

1. Technische Data

U-Value	up to 0.48 W/m².K
Storage temperature	26 to 28 °C
Storage capacity	1185 Wh/m²
g-Value:
perpendicular transmission	48
diffuse transmission	29
Winter	34 – 40
Sommerhalbjahr	17 – 22
LT PCM crystalline	0 – 28 %
LT PCM liquid	4 – 45 %

Technical Data GLASSX^® [PDF]

2. Dimensions

max. 2000 x 3500 mm
max. area 7 m²
Overall thickness 79 mm (-1/+4 mm)

3. Function principle

The significant performance element of GLASSX^®crystal is as a thermal storage module, which absorbs solar energy, stores that energy and then gradually releases a pleaseant amount into the room. As a storage material PCM (Phase Change Material) is used in the form of a salt hydrate. The energy (thermal) storage occurs by „smelting“ the PCM exactly between 26 and 28 °C (comfort zone of humans). When it cools, the heat energy is relased.

In Winter months (low-lying sun) the radiation energy permeates through the angle-selective prismatic glass and is released in a controlled and uniform manner into the inner space.

In Summer, the prismatic glass reflects the high-standing sun > 40° to the outside (overheating protection). The PCM Storage module, which does not release any energy above 27 °C, can absorb heat from the room and store it. This significantly reduces heat-spikes and assists climatic control.

Effectiveness of the PCM Storage module in Summer/Winter real conditions

Heating cost savings - example

4. Application technical notes

GLASSX^®crystal is – as normal insulating glass - to be installed in suitable window or facade constructions.

The principle of self-regulating protection from overheating requires that the units are installed facing South with a maximum deviation of +/- 30°. Deviations greater than this are possible but require the integration of a variable solar control system – such as DLS ECKLITE [>]. This system requires an automatic sun-tracking control.

General glazing guidelines [PDF]