Doorhan Doors Energy Saving Characteristics

The DoorHan sectional doors have leading energy saving characteristics The problem of energy saving is one of the most acute in the whole world, Russia included. Depletion of natural fossil hydrocarbons, ineffectiveness of technical solutions of heat protection in the Russian projects underway and in operation has compelled Russian President D.A. Medvedev to formulate this problem in one of the first decrees (“Some measures of improving energy and ecological effectiveness of Russian economy". The main challenge is to reduce energy consumption in GDP of the RF by 2020 at least by 40% versus the previous year.) A research team of the Institute of Construction Physics has realized the significance and urgency of the problem and has conducted comprehensive tests the first in Russia and on the European continent of the overhead gates of the leading manufactures represented at the Russian market by DoorHan (the Russian manufacturer), a Belarusian manufacturer (type А), a German (type Н). Two independent methods were developed and verified of testing heat engineering characteristics of door systems at low ambient temperatures between -10 and -37ºС by simulating the real conditions to the utmost. For the first time the tests yielded factual temperature distribution and densities of heat fluxes over the door inner surfaces enabling to construct the validated thermal physical model in order to determine the reduced resistance to heat transfer, to rate the conditions of condensation and icing in typical door surface areas, particularly in hinged panel-to-panel joints. The results of the tests have revealed that the DoorHan sectional doors have the best heat engineering characteristics, namely the reduced resistance to heat transfer is 1.13 m2·ºС/W; it is much higher than that of the Belarusian (0.80 m2·ºС/W) and German (0.78 m2·ºС/W) manufacturers.

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The DoorHan sectional doors have leading energy saving characteristics

Thus, the DoorHan sectional doors save 40% more energy than the sectional doors of other manufacturers. It is vividly confirmed by absence hoarfrost or icing over joints between panels from the inner door side at the temperatures below -20ºС. The Belarusian and German gates manifest abundant condensate and icing over the panel joints proving that the joints are improperly designed resulting in large heat dissipation. Figure 1 shows a typical panoramic thermograph of the door design obtained with the infrared imager. The blue color shows the typical areas of cooling (the boundary areas of heat losses). The outdoor air temperature is -20ºС, the indoor temperature is +20ºС, and the indoor relative humidity is 45%.

2

1

Manufacturer

Temperature at point 1, ºС

DoorHan

13,1

19,8

Belarusian manufacturer

5,3

14,2

German manufacturer

4,7

15,1

Temperature at point 2, ºС

Figure 1

Figure 2 shows the panel-to-panel joints from the inside of the door leaf of the three manufacturers. The outdoor temperature is - 28ºС, the indoor temperature is +18 ºС, the indoor relative humidity is 45%. The photographs show clearly abundant hoarfrost and icing between the Belarusian and German panels proving excessive heat losses and incompliance with GOST 31174-2003 (Metallic Doors) and Construction Norms and Rules 23-02-2003 (Heat Protection of Buildings). The joints between panels of the DoorHan sectional doors have absolutely no negative factors of icing, hence they fully comply with all the norms and contemporary requirements («… improving energy and ecological effectiveness of Russian economy …).

Tel.: +7(495)980 -8783, E-mail: [email protected], [email protected]

The DoorHan sectional doors have leading energy saving characteristics

hoarfrost

no hoarfrost or icing

icing icing

DoorHan panel joints

Belarusian panel joints

German panel joints

Figure 2

Negative temperatures are typical in Russia, the Urals and Siberia in particular. The icing of hinged panel joints causes failure of sectional doors under nominal conditions, the joints lose their tightness and integrity, and automatic door closing mechanisms fail to operate. The exploration by the above research group together with practical testing and theoretical calculation has permitted to asses objectively the heat saving characteristics of mobile enclosing structures. The energy saving characteristics of the designs of leading sectional doors marketed in Russia have been rated objectively. It is another proof that the DoorHan sectional doors are unique suitable for the Russian wintertime conditions that enable to achieve outstanding energy saving while satisfying all the norms.

Tel.: +7(495)980 -8783, E-mail: [email protected], [email protected]