InDeWaG demonstrator in Spain
The approach of InDeWaG project is to enable maximum use of daylight by a transparent glass facade and at the same time meet nearly zero energy performance. The main objective of the Spanish demonstrator is to validate the strategy of "energy rejection" through a CoolGlass envelope in order to achieve nZEB. CoolGlass is a triple glazing using highly reflective coating (Xtreme 60.28) deposited on the inner surface of the outermost glass pane aiming at minimizing the energy absorption. The concept of CoolGlass is to eliminate internal heat loads by circulating cool water through the water chamber facing indoors. This cool isothermal envelope allows insulating the building from outer climate conditions.
The demonstrator is an autonomous mobile prototype consisting of a steel tube structure of dimensions 1.5m x 1m, mounted on rotating wheels with brake and anti-tip buttress. Three of its facades, the floor and the roof are formed by opaque enclosures made of sandwich panel (aluminum sheet + 100mm of extruded polystyrene insulation). The main facade is composed of two glazings: Reference glazing (1x0.5m) and CoolGlass (1x0.5m), connected to its corresponding circulator.
As it is shown in the figure, the main strategy of this mock up is to reject solar energy by means of the CoolGlass module and achieve high levels of comfort in the interior of the cabin by an autonomous primary circuit:
- For cooling down the interior of the cabin, the peltier cooling device (powered by a battery charged by the PV panel) will serve cool water to the secondary circuit.
- For heating the interior of the cabin, an electric resistance wrapped around the circulator (powered by a battery charged by the PV panel) will provide hot water to the secondary circuit.
The main objectives of the Spanish demonstrator are:
- To evaluate differences between isolated glazing and glazing integrated in an insulated room.
- Validation by means of real data of mathematical models for internal solar heat distribution.
- Measurements for energy demand during the whole year. -
- Comparison of thermal performances between the Reference Glazing and the CoolGlass Module.
- Validation of nearly zero energy strategy based on a Peltier Cooler device and electric resistance powered by photovoltaic panels.
- Overheating evaluation of different surface finishes: White box and black box.