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ENK6-CT1999-00019 IMPLEMENTATION OF THE “SOLVENT” GLAZING SYSTEM: A USER-FRIENDLY DESIGN TOOL Evyatar Erell and Yair Etzion (Ben-Gurion U.) Jose Molina (U. of Seville) and Ismael Rodriguez (U. of Cadiz) Vitor Leal and Eduardo Maldonado (U. of Porto) ENERBUILD RTD PROJECT MEETING
IMPLEMENTATION OF THE “SOLVENT” GLAZING SYSTEM:
A USER-FRIENDLY DESIGN TOOL
Evyatar Erell and Yair Etzion(Ben-Gurion U.)
Jose Molina (U. of Seville) and Ismael Rodriguez (U. of Cadiz)
Vitor Leal and Eduardo Maldonado (U. of Porto)
ENERBUILD RTD PROJECT MEETING
What is the SOLVENT project: Exposition of the research problem, project objectives and indicative results.
The user-friendly design tool as a means of assisting professionals in the building industry to specify an appropriate glazing combination for their project.
THE SOLVENT PROJECT (in brief!)
In climates with cool, sunny winters and warm summers, direct gain systems have several drawbacks:
Is it possible to overcome these problems yet not lose the benefits of solar heating by direct gain?
Solar radiation is absorbed in the tinted glass, resulting in temperature elevations of 20 degrees or more above ambient air.
glass surface temperatures (summer mode)
Sde Boqer test window, September 1, 2001
Room air enters the bottom of the vented channel, absorbs energy from the warm glass, and is supplied to the room up 20 degrees warmer.
vertical temperature profile in air channel (winter mode)
(Sde-Boqer test cell, February 3, 2002)
Improved daylighting observed: Smaller (absolute) contrast and lower levels of illumination in conditions of extremely intense sunlight.
Clear double-glazed window
illumination (0.85 m above floor), exterior daylight – approx. 110,000 lux.
THE USER-FRIENDLY DESIGN TOOL
The SOLVENT user-friendly tool is targeted at architects and energy consultants in the building construction industry.
The absorptive glazing should be as dark as possible, to block solar gains in the summer.Glazing properties
The first step is to select an appropriate absorptive glass!
Accurate; time consuming; requires professional software, such as RADIANCE; requires skilled user.
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2. A simplified simulation tool –SOLDES:
The SOLvent Daylight Evaluation Script is an interface with RADIANCE
Semi-professional; Requires specific software to be installed in the computer, and basic Unix/Linux knowledge.
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3. A library of pre-worked examples:
Crude; restricted to limited number of building typologies and environmental conditions; easy to use.
go to slideGlazing selection
Window width (W), depth (D) and height (H), followed by Horizontal (HD) and Vertical (VD) distance to origin
Reflectivity of the wall material
Number of viewpoints
View point(s) coordinates
Sun altitude and Azimuth
XInput data for SOLDES
Assume: Interior walls have a reflectivity of 80%
All test data to be collated and made available on CD or by internet, in conjunction with project reports.
Academic publication of aerodynamic, thermal and optical models.
A module describing the window is being prepared for integration in ESP-r.
Design guidelines and a computerized tool are being developed in the project, to provide architects with technical information required for glazing selection.
A high-profile project for a “real” building, as opposed to an experimental or demonstration facility, is probably the best means of creating interest – in the construction industry, among building designers and in the general public.
Ben-Gurion University of the Negev, ISRAEL
Evyatar Erell and Yair Etzion
AB Överums Fönsterfabrik, SWEDEN
University of Gävle, SWEDEN
University of Seville, SPAIN
Jose Luis Molina
University of Porto, PORTUGAL
Brandenburgische Technische Universitaet Cottbus, GERMANY