Accumulating on the roof of the snow under sunlight or because of leakage of heat from the room begins to melt. As the melting snow water begins to flow down along the ledges and gutters, and freezes again, forming layers of ice that block the flow of melt water. With further accumulation of water may occur on the walls, a roof and inside the premises. All this can cause considerable damage the roof and gutters of buildings. In addition, the icicles hanging from the roof weighing several pounds pose a real threat to people's lives.
Model laying the heating cable to prevent ice formation on the roof, the gutters and downpipes.
Anti-icing system NELSON EASYHEAT
about
gutter heaters
eliminates the formation of ice dams;
increases the service life of the roof, gutters and drains;
will protect people from falling icicles and ice blocks.
Anti-icing system NELSON EASYHEAT includes the following main parts:
heating section;
distribution mains to connect the fins and sensors to the control system;
automation system, which provides control of the heating system and protection against possible short circuits in excess of the allowable leakage current to the ground;
the automatic heating control.
Fuel elements in the anti-icing system is self-regulating NELSON EASYHEAT cable NELSON Limitrace SLT-2.
Self-regulating heating cable SLT-2
Features:
Voltage - 220V
Power of 17 W / m in air, 32 W / m in water (ice) at 0 C
Temperature class T 6
The cross section of current carrying conductors - 1.3 mm2
Minimum temperature for installation - 40 C
The minimum bend radius - 35 mm
Size about 12 x 6 mm.
Components
The copper wires coated with tin
Self-regulating conductive matrix
Internal thermoplastic insulation
The second thermoplastic shell
Standard metal sheathing
UV protective polyolefin sheath
Description:
Self-regulating heating cable NELSON LIMITRACE type SLT-2 - is an electric heater tape with parallel conductors. Conductive semiconductor matrix is pressed to copper bars around 12th caliber with a tin coating, consisting of a large number of stranded conductors. The conductive core material increases or decreases its heat output in response to changes in temperature. Two layers of insulation provide dielectric strength, moisture resistance, protection against impact and abrasion, as well as protection from chemical exposures.
Internal thermoplastic insulation pressed to the conductive matrix. In turn, this insulation pressed to the shell of a thermoplastic elastomer. The cable is protected by a metal braid of tinned copper, while providing grounding for the entire length of the cable. UV-stabilized with an external isolator does not support combustion of the modified polyolefin is used to cover the sheath, as the cable used in moisture and direct sunlight.
How it works:
Parallel bus voltage along the entire length of the heating cable. Conductive matrix is a continuous heating element, thus allowing to cut the cable at any point, except for the appearance of the dead and cold zones. Heating cable gets its properties of self-regulation by the conductive properties of the matrix. With increasing temperature of the matrix material, the number of conductive paths in the matrix decreases, automatically decreasing the heat.
As the temperature decreases, the number of conductive paths increases, leading to an increase in heat dissipation. This happens at every point along the length of the cable, so the output power depends on the environmental conditions along the pipeline. The ability to self-regulation makes it possible to gush cable is not formed by hot spots and areas of local overheating.
Types of exterior coatings:
Cable SLT-2 comes in a single embodiment - JT. Tinned copper braid tin covered with a modified polyolefin insulator. It is used in conditions of high humidity and inorganic compounds (phosphates, not concentrated acids, chlorides, carbonates).
The advantages of using a self-regulating system of de-icing cable:
A. energy savings
cable increases its power in the formation of ice on it, and reduces the drying power;
cable adjusts its heat output with changes in ambient temperature.
Two. reliability of the system
inability to overheat the cable with an accumulation of debris in the gutters and downpipes;
the ability to install the cable splice closure, and without the risk of overheating;
protection against ultraviolet radiation;
high mechanical and chemical resistance;
resistance to significant voltage drops;
virtually maintenance free systems.
Three. ease of installation
Cable cut to length without changing its capacity.
Effective use of anti-icing NELSON EASYHEAT necessary control system. It is a special thermostat that turns on / off system in a predetermined temperature range. A more complex version control system is a weather station, which is to enable / disable the system takes into account not only the temperature range, and ambient humidity. The cost of weather substantially higher than the cost thermostat, but its use in anti-icing system will save power consumption.
In some cases, depending on the complexity of the roof, for the effective operation of anti-icing system NELSON EASYHEAT need to install the elements of snow retention.
