Heat protection and energy savings - Effective protection of office buildings against heat and glare using film roller blinds
Interior MULTIFILM® roller blinds offer reliable heat protection for windows.
The core of the roller blinds is a polyester film with aluminium coating facing the outside. This film acts like a mirror: If solar radiation falls onto the roller blinds, the aluminium layer reflects it back to the outside immediately. This way, solar energy cannot convert into heat in the room. The film acts as heat protection shield of the window and reduces heat build-up inside the rooms. The advantages of MULTIFILM® heat protection roller blinds at a glance:
- Effective darkening and glare protection
- Reflection of up to 90 % of the incident solar energy
- Rooms need not to be cooled additionally
Saving energy in summer
MULTIFILM® film roller blinds verifiably keep heat away from the room and counteract room overheating during summer.
The core of the roller blinds is a polyester film with aluminium coating facing the outside. This film acts like a mirror and reflects incident solar energy back to the outside immediately, before it can be converted into heat inside the room.
- Prevention of the greenhouse effect
- Reduction of heat build-up in the rooms
- Comfortable room temperatures
- Reflection of up to 88 % of the total solar energy
- g-value reduction to 12 %
- Approx. 30 % cooling energy savings
A study on thermal room climate proves it. Compared with several interior and exterior sun protection systems, the film roller blind achieves very good results: approx. 30 % cooling energy can be saved using MULTIFILM® film roller blinds. In terms of energy aspects, exterior Venetian blinds have a slight edge over film roller blinds; however, they offer only 90 % availability when it comes to cutting off wind. On the other hand, interior film roller blinds are in action all through the 365 days of the year.
(Film SiAt023 with thermal insulating glass Climaplus 1.1N; source: ALware)
Saving energy in winter
The film roller blind with side guides acts against the thermal loss through the window due to its insulating properties. The aluminium coating reflects the heat radiating from inside to the outside back into the room.
- Reduced room cooling
- Improved U-value of windows and façade
- Saving heating energy
(Film SiAt013 with insulating glazing
Climaplus Ultra N (1.1 W/m²K)
acc. to Fraunhofer Institute IBP Stuttgart)
37 % savings in cooling and heating energy
- Estimation of annual power requirement for a non-shaded office space and comparison with that of a shaded room
- Comparison of four different sun protection systems
- Office space (19.4 m2 ) with 2 persons and 2 PCs
- Window (5.4 m2) facing the south and thermal insulating glass
according to DIN EN 14501-C (g-value: 59 %; U-value: 1.2 W/m2K)
- Rated temperature: between 20°C and 26°C
- Geographical location: Munich
- Period of study: 1 year
Sun protection system Roller blind Roller blind Venetian blind Venetian blind Position internal internal internal external Hangings film SiAt01 fabric Verosafe 12.228/1 horizontal slats Turnils 17 Aluminium blank aluminium slats Remarks side guides wihout side guides vertical blinds in cut-off position vertical blinds in cut-off position Total U-value 0.89 1.11 1.17 Total g-value 0.26 0.41 0.51 Fc-value 0.44 0.70 0.86 Total cooling and heating
energy requirement wihout sun protection in kWh
998 Total cooling and heating
energy requirement with sun protection in kWh
625 775 845 670 Total cooling and heating
energy savings with sun protection in %
37% 23% 15% 33%
- By using film roller blinds, 37% energy savings on cooling and heating can be achieved as against a nonshaded window. The film roller blind takes up the top position among comparable systems.
- The Fc-value of the studied film-glass combination is at 0.44. This corresponds to energy efficiency class 2 ("high").2)
1) Computations done with software application Parasol, V 6.6, University Lund/Sweden
2) According to energy efficieny classification by association of internal sunscreen (ViS)
Energy Label for film roller blinds
Energy Label represent in a descriptive and transparency way the energetic behavior for devices, buildings or cars in the well-known energy efficiency classes. Thereby they offer a good and much-used decision making tool when purchasing goods.
Now this decision making tool is available also for film roller blinds: The Energy label of the ift (Institut for window technique) in Rosenheim evaluates and illustrates windows with sun protection systems regarding their energy efficiency in the well-known energy efficiency classes.
The classification certifies: Film roller blinds improve the energy efficiency class of a window depending on the window type both with the required heating and with the required cooling energy up to 4 stages. Even with high-quality windows film roller blinds contribute substantially to the energy saving.
With the Energy label of the ift Rosenheim once more the high energy saving potentials by film roller blinds and their positive effects on the energy balance of the window/ the building is confirmed.
Further information you find on our flyer:
Energy Label for windows with MULTIFILM® film roller blinds
Heat protection under the roof
The heat protection of roof-lights is particularly important. By the inclination of roof-lights the solar radiation strike the window glass in rectangular direction and enters completely into the room. Therefore attics with windows heat up faster than this without roof-lights.
MULTIFILM® film roller blinds are working against this process. By reflecting most of the solar radiation at the aluminum layer back to outside the blinds keep the solar radiation away from the room and offer thereby an excellent heat protection. In this way the heating up of the rooms will be decreased and the room temperatures remain pleasant.
Heat protection roller blinds made of film - the heat shield for offices
Heat protection roller blinds represent a very effective solution to create also at high-summer temperatures a pleasant room climate in offices. The heat protection roller blind is made of a special film which was originally developed for the use in the outer space.
Thus heat protection roller blinds of MULTIFILM® help to retain a cool head at the office work. In order to optimise this effect it is advisable to air the rooms early in the morning and to keep the heat protection roller blinds closed during the day.