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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

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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

22-23October, 2002

Lyon, France


Overview
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


PART 1:

THE SOLVENT PROJECT (in brief!)


What is the solvent glazing system i problem definition
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?



Project objectives
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.


Indicative experimental results i glass surface temperature
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


Indicative experimental results ii air temperature
Indicative experimental results (II): Air temperature 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)


Indicative experimental results iii illumination levels
Indicative experimental results (III): Illumination levels temperature

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.


PART 2: temperature

THE USER-FRIENDLY DESIGN TOOL


User friendly design tool
User-friendly design tool temperature

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.


Glazing properties

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!


Daylight availability local conditions
Daylight availability – local conditions solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

source: Meteonorm


Glazing selection

1. solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)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


Daylight simulation with radiance
Daylight simulation with RADIANCE solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

back


Input data for soldes

Room width dept and height solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

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


Pre worked examples i environmental conditions
Pre-worked examples (I): Environmental conditions solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)


Pre worked examples ii room geometry
Pre-worked examples (II): Room geometry solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

Plan view

Elevation

Assume: Interior walls have a reflectivity of 80%


Solvent design tool daylighting case study
SOLVENT design tool: Daylighting case study solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)


Energy calculation i input window specifications
Energy calculation (I): Input window specifications solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)


Energy calculation ii hourly results

1. Select location and date solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

2. Define operating conditions

3. Select desired output

Energy calculation (II): hourly results


Energy calculation iii daily results
Energy calculation (III): daily results solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)


Energy calculation iv monthly results
Energy calculation (IV): Monthly results solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)


Energy calculation v compared to reference glazing
Energy calculation (V): Compared to reference glazing solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)


PART 3: solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

DISSEMINATION ACTIVITIES


Dissemination i software and documentation
Dissemination (I) – software and documentation solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

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.


Dissemination ii the glazing system
Dissemination (II) – the glazing system solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

  • 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’


Dissemination iii demonstration project
Dissemination (III) – demonstration project solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

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.


The solvent consortium
The SOLVENT consortium solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)

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


THANK YOU! solar gains in winter) and should provide a high level of thermal insulation (preferably low-e)


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