SOLVENT ventilated solar screen window consortium the problem solutions? principle modeling aims...

SOLVENT

ventilated solar screen window

consortiumconsortium

the problemthe problem

solutions?solutions?

principleprinciple

modeling modeling

aimsaims

test data test data

ESP-r ESP-r

test sitestest sites

dissemination dissemination

home home

ENK6-CT1999-00019

SOLVENT

Evyatar Erell and Yair Etzion

BUILDING ENERGY RESEARCH

JOINT FP5 ENERGIE Info-day

and

ENERBUILD RTD PROJECT MEETING

6 & 7 September 2001

Quality Hotel Konserthuset, Malmö, Sweden

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The SOLVENT project

The project aims to complete the development of an

innovative glazing system, which is based on the concept of

converting short-wave solar radiation to convective heat.

• Development of aerodynamic, thermal and optical models

• Design of a suitable frame

• Experimental evaluation

• Development of a design tool and guidelines for installation

The expected outcome is a tested product ready for

demonstration and commercial exploitation.

The SOLVENT project - aims

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The SOLVENT consortium

Ben-Gurion University of the Negev, ISRAELEvyatar Erell and Yair Etzion

AB Överums Fönsterfabrik, SWEDENNils Carlstrom

University of Gävle, SWEDENMats Sandberg

Asociación de Investigación y Cooperación Industrial de Andalucia, SPAINJose Luis Molina

Instituto de Engenharia Mecanica, PORTUGALEduardo Maldonado

Brandeburgische Technische Universitaet Cottbus, GERMANYOlaf Gutschker

The SOLVENT consortium

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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

2. Large glazed areas are useful in winter,

but may cause over-heating in summer.

In climates with cool, sunny winters and warm summers, direct gain systems have several drawbacks:

Problem definitionProblem definition

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• fixed shading devices

- interfere with the view through the window; and

- reduce heating efficiency in winter

• operable shading devices

- when deployed – have same effects as fixed shading devices

- when not deployed – do not address thermal and visual stress …

• tinted or reflective glazing may reduce glare, but also

- reduce heating efficiency in winter; and

- may still allow too much heat to penetrate to the interior

• selective glazing (angle-selective, electro-chromic)

- experimental, require considerable research

- when in the transmission phase – do not address thermal and visual stress …

Existing solutionsExisting solutions

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Principle of operationPrinciple of operation

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Thermal model

e

dz

W

L

q1q2

z

T(z)T1

T2

Ti , v

To

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d – pane-to-pane distance

Hin – inlet height

Hin – outlet height

H – height of glazing system

Aerodynamic parametersAerodynamic parameters

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Integration in ESP-r

IndoorTemperature

MeteorologicalVariables

Window Geometry

SurfaceTemperatures

HeatFluxes

Iterative process for calculating the film

coefficients Glass Characterization

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Cottbus PASLINK test cell with SOLVENT window

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Sde Boqer ‘white house’

SOLVENT window

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Interior (right) and exterior view of test window at Sde Boqer

black globe

pyranometer

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Light sensors

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Interior air

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test reference ambient

Sde Boqer test window, September 1, 2001

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Interior radiation

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test reference vertical south

Sde Boqer test window, September 1, 2001

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SOLVENT reference

Sde Boqer test window, June 16, 2001Black globe near window

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Sde Boqer test window, September 1, 2001Glass surface temperatures (I)

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tinted exterior tinted facing channelclear facing channel clear (interior)

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Glass surface temperatures (II) Sde Boqer test window, September 1, 2001

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SOLVENT reference

Exterior surface of clear glass

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(Sde Boqer test window, September 1, 2001)Air channel temperature

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top middle bottom ambient DBT

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Channel airflow and wind

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wind [m/s]

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channel flow [m/s]

environmental wind (LH scale) channel airflow (RH scale)

(Sde Boqer test window, September 1, 2001)

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Illumination (Sde Boqer, September 1, 2001 - noon)

1406

774

606

478587

625

563

exterior daylight – approx. 110,000 lux!

* 3091 in reference room!

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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.

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Dissemination II - the glazing system

Overums Fonsterfabrik (window manufacturer) will promote

the product by:

• product catalogues• trade fairs • demonstration installation

The consortium will also publicize the window through

environmental publications and internet sites, such

• WIRE (ISES)• EU web services such as ‘MARKETPLACE’

SOLVENT ventilated solar screen window consortium the problem solutions? principle modeling aims...

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Transcript of SOLVENT ventilated solar screen window consortium the problem solutions? principle modeling aims...