ENK 6 -CT 1999 -00019 overview problem concept IMPLEMENTATION OF THE “SOLVENT” GLAZING SYSTEM: A USER-FRIENDLY DESIGN TOOL objectives tool glass properties glass selection 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) energy calcs dissemination ENERBUILD RTD PROJECT MEETING consortium 22 -23 October, 2002 home Lyon, France SOLVENT Development of a ventilated solar-screen glazing system
Overview overview problem concept Part 1: What is the SOLVENT project: Exposition of the research problem, project objectives and indicative results. objectives tool Part 2: glass properties The user-friendly design tool as a means of assisting professionals in the building industry to specify an appropriate glazing combination for their project. glass selection energy calcs dissemination consortium Part 3: Dissemination activities home SOLVENT Development of a ventilated solar-screen glazing system
overview problem concept objectives PART 1: THE SOLVENT PROJECT (in brief!) tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
What is the SOLVENT glazing system (I): Problem definition overview problem In climates with cool, sunny winters and warm summers, direct gain systems have several drawbacks: concept objectives 1. tool glass properties Direct exposure to solar radiation often results in: - visual discomfort due to glare - thermal discomfort due to high radiative load - deterioration and fading of furnishings glass selection energy calcs 2. Large glazed areas are useful in winter, but may cause over-heating in summer. dissemination consortium home Is it possible to overcome these problems yet not lose the benefits of solar heating by direct gain? SOLVENT Development of a ventilated solar-screen glazing system
What is the “SOLVENT” glazing system (II): The concept overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Project objectives overview problem concept The project aimed to complete the development of an innovative glazing system, which is based on the concept of converting short-wave solar radiation to convective heat and long wave radiation. objectives tool • Develop aerodynamic, thermal and optical models glass properties • Design a suitable frame glass selection energy calcs dissemination consortium home • Experimental evaluation • Develop a design tool and guidelines for installation The outcome is a tested product ready for demonstration and commercial exploitation. SOLVENT Development of a ventilated solar-screen glazing system
Indicative experimental results (I): Glass surface temperature overview Solar radiation is absorbed in the tinted glass, resulting in temperature elevations of 20 degrees or more above ambient air. problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home glass surface temperatures (summer mode) Sde Boqer test window, September 1, 2001 SOLVENT Development of a ventilated solar-screen glazing system
Indicative experimental results (II): Air temperature overview 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. problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home vertical temperature profile in air channel (winter mode) (Sde-Boqer test cell, February 3, 2002) SOLVENT Development of a ventilated solar-screen glazing system
Indicative experimental results (III): Illumination levels overview Improved daylighting observed: Smaller (absolute) contrast and lower levels of illumination in conditions of extremely intense sunlight. problem concept Clear double-glazed window objectives SOLVENT window tool glass properties glass selection 50, 000 30, 000 25, 000 20, 000 15, 000 10, 000 5, 000 4, 000 3, 000 2, 000 1, 000 600 dissemination 400 200 energy calcs lux consortium home illumination (0. 85 m above floor), exterior daylight – approx. 110, 000 lux. SOLVENT Development of a ventilated solar-screen glazing system
overview problem concept objectives PART 2: THE USER-FRIENDLY DESIGN TOOL tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
User-friendly design tool overview problem concept The SOLVENT user-friendly tool is targeted at architects and energy consultants in the building construction industry. objectives tool glass properties glass selection Purpose: 1. To assist in the selection of an appropriate absorptive glazing. 2. To evaluate the energy performance of the integrated system. energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Glazing properties overview problem concept objectives tool glass properties glass selection energy calcs dissemination Thermal considerations: q The clear glazing should be as clear as possible (to allow solar gains in winter) and should provide a high level of thermal insulation (preferably low-e) q The absorptive glazing should be as dark as possible, to block solar gains in the summer. Daylighting considerations: q The tinted glazing should be absorptive enough to control glare on sunny days q The tinted glazing should allow reasonable daylighting on overcast days consortium home The first step is to select an appropriate absorptive glass! SOLVENT Development of a ventilated solar-screen glazing system
Daylight availability – local conditions overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home source: Meteonorm SOLVENT Development of a ventilated solar-screen glazing system
Glazing selection overview 1. Detailed simulation (e. g. RADIANCE): problem go to slide Accurate; time consuming; requires professional software, such as RADIANCE; requires skilled user. concept objectives 2. A simplified simulation tool – SOLDES: tool The SOLvent Daylight Evaluation Script is an interface with RADIANCE glass properties glass selection go to slide Semi-professional; Requires specific software to be installed in the computer, and basic Unix/Linux knowledge. energy calcs dissemination 3. A library of pre-worked examples: consortium Crude; restricted to limited number of building typologies and environmental conditions; easy to use. home SOLVENT Development of a ventilated solar-screen glazing system go to slide
Daylight simulation with RADIANCE overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home back SOLVENT Development of a ventilated solar-screen glazing system
Input data for SOLDES overview • Room width dept and height problem • Window width (W), depth (D) and height (H), followed by Horizontal (HD) and Vertical (VD) distance to origin objectives • Reflectivity of the wall material tool • Glazing transmissivity glass properties • Number of viewpoints glass selection • View point(s) coordinates • Sun altitude and Azimuth • Sky type concept energy calcs dissemination Z Y X H VD HD consortium home back Origin point SOLVENT Development of a ventilated solar-screen glazing system W D
![Pre-worked examples (I): Environmental conditions overview problem Diffuse illuminance [k. Lux] Global illuminance [k.](https://present5.com/presentation/0baec5932450a8b0e700c880ef1bf62f/image-17.jpg "Pre-worked examples (I): Environmental conditions overview problem Diffuse illuminance [k. Lux] Global illuminance [k.")
Pre-worked examples (I): Environmental conditions overview problem Diffuse illuminance [k. Lux] Global illuminance [k. Lux] Very high luminance 40 110 High luminance 40 80 Medium luminance 30 50 Low luminance 15 20 Overcast 10 k. Lux 10 10 Sky luminance concept objectives tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Pre-worked examples (II): Room geometry overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium Plan view Elevation home Assume: Interior walls have a reflectivity of 80% SOLVENT Development of a ventilated solar-screen glazing system
SOLVENT design tool: Daylighting case study overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Energy calculation (I): Input window specifications overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Energy calculation (II): hourly results overview 1. Select location and date problem concept 2. Define operating conditions objectives tool 3. Select desired output glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Energy calculation (III): daily results overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Energy calculation (IV): Monthly results overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Energy calculation (V): Compared to reference glazing overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
overview problem concept objectives PART 3: DISSEMINATION ACTIVITIES tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Dissemination (I) – software and documentation overview problem concept objectives tool glass properties glass selection 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. energy calcs dissemination consortium home Design guidelines and a computerized tool are being developed in the project, to provide architects with technical information required for glazing selection. SOLVENT Development of a ventilated solar-screen glazing system
Dissemination (II) – the glazing system overview problem concept Overums Fonsterfabrik (window manufacturer) will promote the product by: • product catalogues • trade fairs objectives tool glass properties glass selection The consortium will also publicize the window through environmental publications and internet sites, such • WIRE (ISES) • EU web services such as ‘MARKETPLACE’ energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
Dissemination (III) – demonstration project overview problem concept objectives tool glass properties glass 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. energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
The SOLVENT consortium overview problem concept objectives tool glass properties glass selection energy calcs dissemination consortium home Ben-Gurion University of the Negev, ISRAEL Evyatar Erell and Yair Etzion AB Överums Fönsterfabrik, SWEDEN Nils Carlstrom University of Gävle, SWEDEN Mats Sandberg University of Seville, SPAIN Jose Luis Molina University of Porto, PORTUGAL Eduardo Maldonado Brandenburgische Technische Universitaet Cottbus, GERMANY Olaf Gutschker SOLVENT Development of a ventilated solar-screen glazing system
overview problem concept objectives THANK YOU! tool glass properties glass selection energy calcs dissemination consortium home SOLVENT Development of a ventilated solar-screen glazing system
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