The formation of ice on the roof leads to the fact that clogged passages for flow of melt water in the gutters on the eaves and icicles formed tumors, ready at any moment to break down. Large masses of ice damage and cause so significant costs to repair the roof of many designs.
Anti-icing system, and roof gutters "Antiled" based on the heating cable is efficient and reliable. They are a set of sections of heating cable, power cable, fasteners and control system and sensors for temperature and humidity.
Systems "Antiled" are recommended for many types of roofs made of various materials including metal, plastic, etc.
about gutter heaters
Heating cable roof.
General properties of the cable roof heating systems or roof
Precipitation in the form of snow, while on the roof, do not represent a particular threat. However, if the conditions for the melting of the snow under the influence of a heat source, it turns into water. If the melt water formed no way for a quick departure from the roof, then upon the occurrence of negative temperature it freezes, turning into ice. Since the necessary conditions for the melting (and melting rate) in ice and snow are different, the next short-term and widespread effect of the heat source may not be melting, but rather an increase in the ice caps. This mechanism of formation of ice dams can lead to the formation of ice jams, traffic jams and long icicles in the tens of meters and weighing hundreds of pounds.
The work of the roof heating cable systems | cable heating systems, roof, at temperatures below -15-20 C, usually not needed.
First, at these temperatures is not the formation of ice on the first mechanism and drastically reduced the amount of moisture in the second.
Second, under these conditions, the amount of precipitation as snow is also reduced.
In the development and installation of de-icing system is necessary to provide water, which appeared as a result of heating cable roof with a roof and a way out of gutters. On the horizontal parts of the roof of the total power density per unit surface area of the heated part (tray, trough, etc.) shall be not less than 180-250 W / sq. Linear power heating cables roof heating cables in gutters shall be not less than 20-30 watts per 1 meter length of drainage and increases with increasing length of the drain to 60-70 W / m
Requirements for cable heating systems and roof mansard roof:
Cable systems heating of the roof work mainly in spring and autumn periods, as well as during thaws. The system is in a cold period (-15-20 C) is not only unnecessary, but can be harmful. Cable heating system for the roof shall be equipped with sensors for temperature, precipitation and water and the specialized temperature control, which can rather be called a mini-weather station. He has to control the operation of the system and allow for the possibility of adjusting the parameters of temperature, taking into account the specific characteristics of the climatic zones, the location and number of storeys of the building.
Heating cables must be installed on all the way meltwater from the horizontal troughs and trays, and ending with the outputs of the gutter and in the presence of the entrances to the storm drain - down to the entrance to the reservoir below the freezing depth. Must meet standards established by the power of heating cables for different parts of the system - horizontal trays and troughs, and vertical drains.
Cable roof heating system include:
heating of the heating roof, consisting of heating cables and accessories for mounting on the roof, and immediately performs the task of translation of precipitation in the form of snow or frost in the water up to their complete removal. The composition of the heating units may also include a funnel with built-in heater, snow retention elements that interact with the heating elements.
distribution and information network that provides food for all elements of the heating and holding of information signals from the sensors to the control panel. The system includes power and data cables that meet the conditions of work on the roof, junction boxes and mounting hardware.
management system, comprising a control cabinet, special thermostats, sensors of temperature, precipitation and water, starting and protective equipment, power systems and the corresponding class performance of the control cabinet.
Main heated areas:
A. Downspouts on the entire length.
Two. Gutters and trays.
Three. Rainwater hoppers and areas around them an area of 1 m2.
4. Input nodes in the gutter downspouts.
Five. Valley (seam roof planes), adjacency to the plane of the roof.
6. Water cannons and water-jet windows in the parapet.
7. Eaves of roofs.
Eight. Drip.
9. The surface of flat roofs and concrete drain trays.
10. Drainage and drainage trays in the ground under the downpipes.
Safety requirements for de-icing systems of the roof. The basic requirements are in terms of fire and electrical safety. To meet their need to fulfill several conditions:
in the system should include only the heating cables with the appropriate certificates, including required fire safety certificate. As a rule, it is nonflammable wires or cables that do not support combustion. For use in anti-icing systems required the manufacturer's recommendations;
heating part of the system must be fitted with residual current devices or automatic differential with leakage current less than 30mA (for electrical safety requirements - 10 mA); sophisticated anti-icing system must be broken down into separate sections with a leakage current in each part, do not exceed the values indicated above. Heating cables are the main producers have all necessary certificates and have passed approbation in the anti-icing systems.
Testing and evaluation of anti-icing systems.
Testing of de-icing systems can be divided into two groups: the acceptance and periodicals. Routine tests usually start with the test insulation resistance heating and distribution cables. Tests RCD (or difavtomatov). Appropriate protocols are drawn up with specific values. Are the most informative test for the operation, during which verified the effectiveness of the system.
It should be noted that the systems are not de-icing systems, instant action. They are designed to operate in standby mode, and once included the appearance of precipitation. If the system was not included in the beginning of the season, and on top of a layer of snow has accumulated, it will take time from 6 hours to days to remove it. There are difficulties at the time of the system during the warmer months.
It checks the proper functioning of the control equipment, simulated signals from the sensors, check the system's transition to the regime of switching loads off the trays, and then drains off. Periodic testing of anti-icing systems are usually held in early autumn to check the technical condition of the system and prepare it to work. First of all, the insulation resistance is checked to determine the damaged areas. It then checks the state apparatus, it is carried out trial inclusion. After checking the settings, thermostat switch is operating system, and it remains a work in standby mode.
