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ENK6-CT1999-00019 IMPLEMENTATION OF THE “SOLVENT” GLAZING SYSTEM: A USER-FRIENDLY DESIGN TOOL

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

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ENK6-CT1999-00019 IMPLEMENTATION OF THE “SOLVENT” GLAZING SYSTEM: A USER-FRIENDLY DESIGN TOOL

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  1. 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 22-23October, 2002 Lyon, France

  2. Overview Part 1: What is the SOLVENT project: Exposition of the research problem, project objectives and indicative results. Part 2: The user-friendly design tool as a means of assisting professionals in the building industry to specify an appropriate glazing combination for their project. Part 3: Dissemination activities

  3. PART 1: THE SOLVENT PROJECT (in brief!)

  4. What is the SOLVENT glazing system (I): Problem definition In climates with cool, sunny winters and warm summers, direct gain systems have several drawbacks: • 1. 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 • Large glazed areas are useful in winter, • but may cause over-heating in summer. Is it possible to overcome these problems yet not lose the benefits of solar heating by direct gain?

  5. What is the “SOLVENT” glazing system (II): The concept

  6. Project objectives • 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. • Develop aerodynamic, thermal and optical models • Design a suitable frame • Experimental evaluation • Develop a design tool and guidelines for installation • The outcome is a tested product ready for demonstration and commercial exploitation.

  7. Indicative experimental results (I): Glass surface temperature 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

  8. Indicative experimental results (II): Air temperature 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)

  9. Indicative experimental results (III): Illumination levels 200 400 600 1,000 2,000 3,000 4,000 5,000 10,000 15,000 20,000 25,000 30,000 50,000 Improved daylighting observed: Smaller (absolute) contrast and lower levels of illumination in conditions of extremely intense sunlight. Clear double-glazed window SOLVENT window lux illumination (0.85 m above floor), exterior daylight – approx. 110,000 lux.

  10. PART 2: THE USER-FRIENDLY DESIGN TOOL

  11. User-friendly design tool The SOLVENT user-friendly tool is targeted at architects and energy consultants in the building construction industry. • Purpose: • To assist in the selection of an appropriate absorptive glazing. • To evaluate the energy performance of the integrated system.

  12. 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) The absorptive glazing should be as dark as possible, to block solar gains in the summer. Glazing properties Thermal considerations: Daylighting considerations: • The tinted glazing should be absorptive enough to control glare on sunny days • The tinted glazing should allow reasonable daylighting on overcast days The first step is to select an appropriate absorptive glass!

  13. Daylight availability – local conditions source: Meteonorm

  14. 1. Detailed simulation (e.g. RADIANCE): Accurate; time consuming; requires professional software, such as RADIANCE; requires skilled user. go to slide 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. go to slide 3. A library of pre-worked examples: Crude; restricted to limited number of building typologies and environmental conditions; easy to use. go to slide Glazing selection

  15. Daylight simulation with RADIANCE back

  16. Room width dept and height Window width (W), depth (D) and height (H), followed by Horizontal (HD) and Vertical (VD) distance to origin Reflectivity of the wall material Glazing transmissivity Number of viewpoints View point(s) coordinates Sun altitude and Azimuth Sky type H VD HD D W Z Y Origin point X Input data for SOLDES back

  17. Pre-worked examples (I): Environmental conditions

  18. Pre-worked examples (II): Room geometry Plan view Elevation Assume: Interior walls have a reflectivity of 80%

  19. SOLVENT design tool: Daylighting case study

  20. Energy calculation (I): Input window specifications

  21. 1. Select location and date 2. Define operating conditions 3. Select desired output Energy calculation (II): hourly results

  22. Energy calculation (III): daily results

  23. Energy calculation (IV): Monthly results

  24. Energy calculation (V): Compared to reference glazing

  25. PART 3: DISSEMINATION ACTIVITIES

  26. Dissemination (I) – software and documentation 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.

  27. Dissemination (II) – the glazing system • Overums Fonsterfabrik (window manufacturer) will promote the product by: • product catalogues • trade fairs • The consortium will also publicize the window through environmental publications and internet sites, such • WIRE (ISES) • EU web services such as ‘MARKETPLACE’

  28. Dissemination (III) – demonstration project 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.

  29. The SOLVENT consortium 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

  30. THANK YOU!

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