INSULATING BLINDS FOR WINDOWS

Ziel

A WAY TO REDUCE HEAT TRANSMISSION THROUGH WINDOWS IS THE USE OF SHUTTERS OR BLINDS DURING THE NIGHT. HERE HOWEVER HUMAN BEHAVIOUR PLAYS AN IMPORTANT ROLE : IF THE HANDLING OF THE SHUTTERS IS NOT VERY SIMPLE THE SHUTTERS OR BLINDS WILL NOT BE USED. THE BLINDS OR SHUTTERS SHOULD ALSO BE SUITABLE FOR RETROFITTING IN EXISTING HOUSES. IN THIS PROJECT A ROLLER BLIND WAS DEVELOPED WHICH CAN BE DRAWN DOWN AT THE INSIDE OF WINDOWS AND WHICH CONSISTS OF A FEW MILLIMETER OF INSULATING MATERIAL. COMPUTER SIMULATION SHOWED THAT FOR A SIMPLE WINDOW WITH A ROLLING BLIND A HEAT TRANSMISSION COEFFICIENT OF 1 W/M2 DEGREE K MAY BE EXPECTED. THIS INCLUDED THE ASSUMPTION THAT THE BLIND NEEDS HEAT REFLECTIVE LAYERS. THE BLIND WAS DESIGNED IN SUCH A WAY THAT THE EDGES ARE SEALED WHEN THE BLIND IS COMPLETELY DRAWN, SO THAT AIR INFILTRATION IN THE HOUSE IS ALSO CONSIDERABLY REDUCED (A 40 % REDUCTION FOR AVERAGE U.K. HOUSES). DIFFERENT TYPES OF SEALS HAVE BEEN TESTED. MAGNETIC AND CELLULAR (SYNTHETIC RUBBER) COMPRESSIBLE SEALS TURNED OUT TO BE MOST EFFECTIVE. FULLY SEALED ENERGY SAVER BLINDS WITH INFRARED REFLECTIVE LAYERS WERE TESTED AND HAD U-VALUES BETWEEN 0,7 AND 1,3 W/M EXP-2 KELVIN EXP-1, DEPENDING ON THE EXPOSURE OF THE WINDOW. THE PAYBACK TIME IS 7 TO 8 YEARS.

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PRE-ENNONUC 2C - Energy research and development programme (EEC), 1979-1983

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University of Westminster

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Ziel

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