A, working mechanism
As is known to all, when power wires, the copper wire in through the current can lead to large after heat loss. Making transmission of the electric power is failure, abate. (copper) line diameter, and the smaller the current through the higher, the heat loss, this phenomenon is called "current load overload". In daily life, long "current load overload" will make the overload of wire of high temperature, to a few baidu is the fire accident caused most culprit! Therefore, the state of power in decoration covert projects are strict standard wiring, and resolutely put an end to this phenomenon required appear.
The working principle of fever cable is used "the current load overload" shortcomings, and develop ground warm heating products. It through high temperature cable and ground the heat conduction grass-roots and to make the ground temperature, achieve the effect of ground heating.
Second, system composition and characteristics
"Wire dish line + insulation board + thermostat" namely formed a set of floor heating system.
Features: high temperature conduction heat, no linear infrared radiation heating.
Three, heating cable be short of regret
1, working mechanism is not reasonable, and energy consumption is unusually high
(1) line heating element be short of regret
In order to achieve the effect of ground evenly heating cable in the ground, fever down repeatedly coiling must be. Its purpose is to make the high temperature body (linear underground cable temperature ℃), become 65 p face shape low-temperature body more than 40 ℃ temperature (ground). Therefore, its reach same floor heating effect, the power needed configuration request higher (power allocation 180w/m2). =
(2) line loss loss be short of regret
Another hot cable shortcoming is: power (quantity) line loss. Because there must be heating element, wire coiled form every increase of one elbow, will increase in power transmission loss. Its principle is like repeatedly, must increase the pipe bend feed water pressure as well.
Above two points, determines the actual high energy consumption of heating cable. Have examples of the robbery, the Shanghai some luxury apartment 165 square meters of residential, in 2005, after installed heating cables in October for the electricity to 2000 multivariate, in December, the electricity after outdoor temperature as 12000 yuan.
2 and system control system reliability is poor
Because fever cable itself in energized, wire temperature will be rising fusing (until yet). Therefore, must use the outer temperature control system to prevent cables and appear to high temperature high temperature fusing phenomenon. So, all the thermostat for heating cable configuration are designed the two sets of temperature control system. One is to control the indoor environment temperature, one is control cable temperature (prevent cable overheat). When one of the two temperature controlling system requirement, the thermostat to set cut off power supply, fever cable stop working.
Heating cables, make the whole such control mode is the security of the system depends entirely on the matched the thermostat (rather than the quality of the product itself). Once the supporting the thermostat malfunction, the entire system inevitable collapse. If the ground fire retardant products covering materials, if not, it will lead to the user huge loss of irreparably.
3, surface layer requires high of cement
Heating cable is, in essence, wires. As you can imagine, 65 ℃ (underground even higher pecked the high temperature lines in) work like a knife with cement floor general baking. And the cement fears also exactly is high temperature. Higher temperatures will make cement strength greatly abate. General cement embankment in order to prevent the summer sun exposure (right now surface temperature reaches 70 ℃) and cause pavement cracked and need at least 14 centimeters thickness of the laid of high standard cement. Such laid condition in the general civil residence, difficult to meet. Meanwhile, the ground water NiCeng cracked generated enormous gravity, will make the ground materials such as ceramic tile, marble together craze.
In addition, temperature of cable for insulation board damage is also very serious. Due to the high temperature, will make cable clingy cable the edge of the insulation board gradually melting. At this time, cable will long into the insulation board and cement layer gradually from. Because, cable and cement layer, the surface to reduce the quantity of heat of cable transmission and ground, thereby affecting gradually reduce the heating effect ground, and increased energy consumption.
