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System of anti-frosting of roofs buy in Almaty
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System of anti-frosting of roofs

System of anti-frosting of roofs

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Kazakhstan, Almaty
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Description
Heating of water waste systems


The system of anti-frosting of roofs and drains, so-called system "roof of bases of icicles" is rather simple and universal design for prevention of formation of frost and removal of ice and snow from gutters and pipes. Besides snowmelt, heating of these sites allows to ensure safety of their operation and to prolong service life.


Formation of icicles and ice on a roof happen when snow on a roof begins to conceal, and water waste trenches and pipes are already hammered with ice, and water has only one way - too much, here and icicles are formed. The problem of system of snowmelt consists in clearing the way of a drain of thawed snow and to accompany it to the lower cut of a drainpipe or to the sewerage at any to temperature of external air. The system of snowmelt has to work until there is a probability of formation of icicles, i.e. thawing on a roof will not stop yet. Process of thawing on a roof goes depending on a design of a roof, amount of "parasitic" heat, temperature of external air, humidity, wind force, etc. Proceeding from the thermal mode? roofs can be divided into three types conditionally: 1. "The cold roof" is the well isolated roof with the low level of heatlosses through the top overlappings, is frequent with the aired subroofing space. Snow begins to conceal only on the sun, minimum thawing temperatures - not below - 50C. 2. "The warm roof" is the badly isolated roof on which snow conceals also at negative air temperatures. Thawed snow flows down down to drains where freezes forming icicles. The minimum temperature of thawing to - 100C. 3. "The hot roof" is the very badly isolated roof at which the attic is used in the technical purposes or as premises. On such roofs snow thaws also at very low negative air temperatures (below - 100C).


Usually in a heating system of drains resistive or self-regulating cables are used. Resistive cables consist of a heating vein (one or two depending on cable model), isolation with a braid, and also the covers steady against influence of heat, an atmospheric precipitation and ultra-violet radiation. On all length resistance of resistive cables remains invariable that is not always good as they allocate identical amount of heat irrespective of where they are: on a pure surface of a metal roof or under a thick snow layer and ice. Resistive cables are delivered a certain power, a certain length with ready factory couplings, the main advantage the low price, about $».¼ 3-5.

The semiconductor plastic matrix located between two conducting veins is heat source in self-regulating cables. The matrix changes the thermal emission depending on ambient temperature: cold - the carrying-out channels many thermal emission increases and vice versa at high temperatures the number of the carrying-out channels decreases and the thermal emission decreases. At the expense of it the self-regulating cable can be cut off any length, and there is no risk of an overheat or burn-out of a tape when passing through a layer of thermal insulation and self-crossing. The only minus rather high price in comparison with a resistive cable.

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System of anti-frosting of roofs
System of anti-frosting of roofs
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