Heating cable system principle of German heating cable

The heating element of heating cable is a resistance wire made of copper and nickel alloy. In a heating cable, the resistance is equal at any equal length and distance. The heating cable is connected with the cold wire through a sealed and waterproof junction box. When a voltage is applied to the cold conductor, a current passes through the heating cable. Because of the resistance, electric energy is converted into heat energy and radiated, and its thermal efficiency is as high as 97%. The heat is first absorbed by the cement layer, and then the indoor dense objects and air are heated by conduction and radiation. According to the different internal structure of heating cable, it can be divided into single conductor, double conductor and unshielded conductor. The power range of each line is per meter 10W~20W. ● German heating cable

● Temperature controller

● Thermal insulation materials

● Barbed wire

● Straps or clips.

● Thermostat plastic conduit

● Concrete layer

● The structure of other auxiliary geothermal cable products is as follows:

● The heating element consists of twisted multi-strand resistance wires and special fiber wires.

● Tin-plated copper mesh for shielding mesh; It can not only eliminate the electromagnetic field without affecting human health, but also strengthen the cable to make it more tensile and compressive.

● Copper stranded wire of thermal cable

● Protective film polyester film

● Silicone rubber material of isolation layer

● PVC protective measures for outer sheath: 30 mA for circuit breaker.

Protection grade: 1

Minimum installation temperature: above 5℃

Nominal limit temperature: above 90℃

Conductor diameter: 7.2mm.

Test voltage: 4000V 1. Germany's first-class heating cable products are completely manufactured according to IEC-800 standard. Before leaving the factory, they have passed relevant rigorous tests such as 4000V voltage, 2000N tensile stress and 90℃ high temperature resistance, ensuring Germany's first-class quality. In Europe and China, German heating cable products have passed the most authoritative standards of German Electrical Appliances Association (VDE) and the high standards of China Wire and Cable Quality Testing Center.

2. Health and safety Like formaldehyde pollution in the home improvement industry, electromagnetic radiation pollution has always been the most sensitive topic in the electric heating industry. German original heating cable can only be exported after passing the magnetic field-free certification, and the electromagnetic radiation value is lower than the German health technical standard value, which is truly healthy, warm, safe and worry-free.

3. Double insurance German heating cable floor heating system is generally underwritten by insurance companies. In China, China insurance companies will also provide high product liability insurance after strict examination. The electric floor heating system completely eliminates the safety worries of users. In addition to the unreasonable heat distribution mentioned above, the traditional heating system provides heat by circulating dry and hot air indoors. The dust circulating with it may have a negative impact on people with allergic reactions. The heating cable floor low-temperature radiation heating system only needs a relatively low temperature, which makes the heat slowly rise from the ground and provides you with the healthiest heating method. This is also the reason why the heating cable ground low-temperature radiant heating system is becoming more and more popular in kindergartens and hospitals.

& gt Do it without fear;

& gt No smoking, headache or respiratory problems;

& gt is an ideal choice for patients with respiratory diseases, allergies and rheumatism. Professional comparison of various heating systems in the local market should comprehensively consider the following points:

(1) the price of purchasing the whole system;

(2) installation costs;

(3) Equipment occupancy cost;

(4) Energy consumption cost;

(5) Maintenance cost within the service life.

Compared with other systems, low-temperature radiant heating system with heating cable floor is easy to occupy market share. In the case of roughly the same overall cost, the ideal, comfortable and warm heat provided by the heating cable floor low-temperature radiant heating system is incomparable. In countries with low-cost power supply at night, the floor low-temperature radiant heating system with heating cables can also provide heating at low cost, and the heat can be stored in the concrete layer and radiated during the day. In other words, the heating cable ground low-temperature radiant heating system has an operable control system, which can ensure the most economical and effective heating all the time no matter which power supply mode is low in cost.

safe

The heating cable ground low-temperature radiant heating system is buried in cement concrete, which works at low temperature and has no fire hazard. It has no open flame and hot surface, so you don't have to worry that children or old people will get burned if they touch it. There are no moving parts, pipes or radiators that may harm you. The heating mode of low-temperature radiation heating system with heat tracing cable makes it especially suitable for old buildings, churches decorated with murals, libraries with books, and rooms that need balanced and slow distribution of heat. Don't worry that the fiery traditional heating equipment will make your wall decoration materials fade. The installation technology of low-temperature hot water ground radiation air source for heating cable and electrothermal film is simple, simple and complicated, and the thermal efficiency is >: 90% >; 80% & gt； 60% & gt； 90% environmental pollution, no boiler pollution, noisy environment, the same life as the building, the thermal efficiency is reduced by 50% in 8 ~ 10 years, a new boiler main engine is replaced around 10 years, and any room can be adjusted independently. The toilet is not installed safely. Any room can adjust the temperature independently. Energy saving is not intuitive. The temperature control system can be set to run economically. The water consumption can be set for the economical operation of the temperature control system. There is no need to use hot water circulation, which increases the floor space on the original ground.

Add 4~8 cm to the original ground.

3~5 cm increase 8~ 10 cm on the original ground. Increase 8~ 10 cm on the original ground. When there is no environmental pollution and combustion, there will be exhaust gas, which will affect air quality. The initial installation cost is relatively low and the maintenance cost is relatively high.

A new boiler needs to be replaced in 8~ 10 years, and the boiler needs to be cleaned once a year, and the cost of replacing underground water pipes (about 10 years) is high. Major components need regular maintenance or replacement. If the operating cost is economical, the cost of 1/3~ 1/2 can be saved. If the operation is economical, it can save part of the cost of natural gas and water resources. Expect the price to rise, which is both economical and beautiful. Only the beautiful thermostat is seen indoors, which has good aesthetics, good comfort, uniform heating and no loss in power transmission. According to the principle of traditional Chinese medicine, each section of pipeline has heat loss and uneven heating. Safe and original Freon temperature limiter cannot be laid at a long distance, which ensures that it will never leak and short circuit. There are many connectors and line cards.

The easily damaged gas stove is dangerous to some extent, and there are phenomena of running, running, dripping and leaking 1. 1 General regulations and system design.

1. 1. 1 The content and depth of the construction drawing design document of the floor radiant heating project shall meet the following requirements:

(1) The construction drawing design document shall be based on the construction drawing, including drawing catalogue, design description, heating cable layout, temperature control device layout and ground structure schematic diagram.

(2) The design description shall specify the indoor and outdoor calculated temperature, heat source and heat medium parameters or power distribution scheme, power load and technical data and specifications of heating cables; Indicate the specific conditions of use, such as processing temperature, working voltage, conductivity, density, specification and thickness of heat insulation materials.

(3) The specific layout of heating cables shall be drawn in the plan, and the laying spacing, calculated length and expansion joint requirements shall be indicated.

1. 1.2 The line power of heating cable shall not be greater than 20w/m. 。

1. 1.3 The working current of the heating cable thermostat shall not exceed its rated current.

1. 1.4 The floor radiant heating system with heating cable can realize the control function through the combination of thermostat and contactor, and the selection of thermostat shall meet the following requirements:

(1) Geothermal thermostat is used in large space, bathroom, toilet, swimming pool and other areas.

(2) The dual-temperature thermostat is applied to the occasions where it is necessary to control the room at the same time and moderately limit the surface temperature.

1. 1.5 The temperature controller of the heating cable should be set in a position where there is no radiator nearby, no shelter around, no wind, no direct sunlight, ventilation and dryness, and it can correctly reflect the indoor temperature. It should not be located on the external wall, and the height is 1.2m from the ground. The underground thermostat should not be covered or blocked by residents, but should be arranged in places where people often stay.

1. 1.6 The humidity of the operating environment should be considered in the selection of the temperature controller for the heating cable.

1. 1.7 The layout of heating cable should consider the influence of floor furniture.

1. 1.8 heating cables should not be arranged under ground fixed equipment and sanitary ware.

1. 1.9 the power supply mode of heating cable system should be AC220V, and when the load of incoming loop exceeds 12KW, AC220V/380V three-phase loop system can be adopted. When multiple heating cables are connected to the 220V/380V three-phase system, the three are balanced accordingly.

1. 1. 10 When the heating electricity needs to be charged separately, the electric circuit of the heating cable system should be set separately.

1.1.11distribution box shall have the leakage protection function of overcurrent protection box, and each power supply circuit shall be equipped with a bipolar switch with leakage protection device. The conduit for 1. 1. 12 shall be hard casing.

1. 1. 13 The electrical design of the floor radiant heating system with heating cables should comply with the current national standard "Code for Electrical Design of Civil Buildings" JJ/T 16 and "Code for Acceptance of Construction Quality of Building Electrical Engineering" GB50303.

1. 1. 14 The grounding wire of the heating cable must be connected with the grounding wire of the power supply.

1. 1. 15 heating cable must be grounded.

1.2 ground structure

1.2. 1 The ground adjacent to the soil must be provided with an insulation layer, and a moisture-proof layer must be provided under the insulation layer. The floor directly adjacent to the outdoor air must be provided with insulation layer.

1.2.2 thermal resistance should be less than 0.05 m & 2k/w material.

1.2.3 when the thermal insulation layer of floor radiant heating system adopts polystyrene foam plastic board, its thickness can be determined according to the principle of equivalent thermal resistance. Insulation layer thickness of polystyrene foam plastic board (mm) The interlayer floor insulation layer 20 is adjacent to soil or unheated room, and the floor insulation layer 30 adjacent to outdoor air is 40 1.2.4 The filling layer material should be C 15 pisolite concrete, and the particle size of pisolite should be 5 ~12 mm. The thickness of heating cable filling layer should not be less than 20 mm The ground load should be greater than 20kn/. Sup2 shall take reinforcement measures together with structural designers.

Calculation of heat load 1.3

1.3. 1 The load of radiant floor heating system shall be calculated according to the current national standards, Code for Design of Heating, Ventilation and Air Conditioning (GB500 19) and Technical Code for Radiant Floor Heating (JJ- 142). Relevant provisions of calculation.

1.3.2 to calculate the heat load of the floor radiant heating system, the indoor calculated temperature should be 2℃ lower than that of the convection heating system, or 90% ~ 95% of the total heat load calculated for the convection heating system.

1.3.3 The heat load of the local floor radiant heating system can be determined by multiplying the calculated heat load of the whole room by the area of the area and the additional coefficient specified in the table below. Compared with the total room area, the additional coefficient of heat load of local radiant heating system is 0.55 0.40 0.25. Additional coefficient1.301.351.501.3.4 For rooms with a depth greater than 6m, it is advisable to divide the rooms with a distance from the external wall and calculate the heat load respectively.

1.3.5 For the building area where heating cables are laid, the ground heat transfer loss should not be calculated.

1.3.6 When calculating the heat load of the floor radiant heating system, the height addition may not be considered. 2. 1 General provisions

2. 1. 1 All materials of floor radiant heating system shall be determined after comprehensive comparison according to the requirements of working temperature, workload, design life, site waterproof, fire prevention and other engineering environments and construction performance.

2. 1.2 All materials shall pass the inspection according to the current relevant national standards, and the relevant mandatory performance requirements shall be tested by nationally recognized testing institutions, and valid certification documents or inspection reports shall be issued.

2.2 Thermal insulation materials

2.2. 1 Thermal insulation materials should be made of non-combustible or non-combustible materials with low thermal conductivity, and have sufficient bearing capacity, and should not contain bacteria sources, and should not have odor and volatile substances that may be harmful to health.

2.2.2 When other thermal insulation materials are selected, their technical indicators shall conform to the provisions in the table below, and thermal insulation materials with the same effect shall be selected.

2.2.3 The main technical indicators of polystyrene foam used in radiant floor heating engineering shall meet the following table: The main technical indicators of unit performance indicators of polystyrene foam engineering show that the density is Kg/m3 ≥ 20.0, the compressive strength (that is, the compressive capacity under 10% deformation) is kpa ≥ 100, and the thermal conductivity is w/mk ≤ 0.01.

3. 1. 1 Before construction and installation, the following conditions shall be met:

(1) Design and construction drawings and relevant technical documents are complete:

(2) There is a perfect construction scheme and construction organization design, and technical disclosure has been completed;

(three) the construction site has water supply and power supply conditions and temporary facilities for storing materials;

(4) The civil engineering major has completed the wall painting (excluding the surface layer), the external doors and windows have been installed, and the ground has been cleaned; The kitchen and bathroom should be tested and accepted.

(5) The related electrical embedment and other projects have been completed.

3. 1.2 The technical documents of all purchased materials and products shall be clear, the appearance inspection shall be qualified, and relevant tests shall be conducted by sampling when necessary. 3. 1.3 heating cables shall be transported after being packaged away from light and shall not be exposed in bulk; When transporting, loading, unloading and handling, handle with care, and don't throw, drop, roll or drag. Don't rain, should be stored in a well-ventilated, clean warehouse, the temperature does not exceed 40℃; The distance from the heat source should be kept above 1 m, and damage caused by ambient temperature and physical pressure should be avoided.

3. 1.4 During construction, paint, asphalt or other chemical solvents should be prevented from contacting and polluting the surface of the heating cable.

3. 1.5 The construction environment temperature should not be lower than 5℃. When working in an environment below 0℃, measures should be taken to increase the site temperature;

3. 1.6 When there is overlap between heating cables, it is forbidden to electrify the cables;

3. 1.7 During construction, it is not suitable to cross construction with other types of work, and all holes left on the ground should be completed before filling construction.

3. 1.8 During the construction of radiant floor heating project, it is forbidden to trample heating cables.

3. 1.9 After the construction, the as-built drawing shall be drawn to accurately mark the laying position of heating cable and the burial position of ground temperature sensor.

3.2 Laying of insulation layer

3.2. 1 The floor on which the thermal insulation layer is laid shall be smooth, dry and free of sundries. The root of the wall should be straight and free of dust.

3.2.2 The insulation layer shall be laid flat and close to each other. On the ground that is in direct contact with soil or invaded by moist gas, a moisture-proof layer should be laid before laying the insulation layer.

3.3 Installation of heating cable system

3.3. 1 Characteristics of German heating cable

(1) One cable and one loop, German double conductor cable can cancel the electromagnetic fields in both directions and neutralize the magnetic field, which is very safe for human body. Therefore, it is called warm as spring and healthy.

(2)(2) Green heating, in the same comfortable state, the temperature can be 2-3 degrees Celsius lower than the temperature adjusted by convection heating, saving valuable heating energy.

(3) A connecting wire is very convenient to connect, which saves both material and time.

(4) Fully sealed and waterproof, with solid strength insulation on the outer layer, multiple strict waterproof measures and multiple detection guarantees. (5) Maintenance-free, because there is no wear and tear, it will not break down and can last as long as a building.

(6) German heating cable system. The heating cables and wires supplied are imported from Germany. It was certified in Germany and passed the inspection of China National Wire and Cable Supervision and Inspection Center.

(7) Safety is more secure. The standard withstand voltage of
C60800 is 2000V, while the German heating cable is subjected to the withstand voltage test of 4000V V, ..

(8) The cold wire and hot wire joints of heating cables are its weak links, while German heating cables are processed by professional equipment and technology, and the quality and technical standards are strictly controlled to ensure the safety performance, mechanical performance and service life of the connection. The joints have been certified by the National Cable Quality Supervision and Inspection Center.

3.3.2 Construction of heating cable system

(1) Heat tracing cables shall be laid according to the cable spacing and direction indicated in the construction drawing, and the heat tracing cables shall be kept straight, with the spacing between 130mm and 160mm, not less than 50mm and not more than 200mm, and the installation error of the spacing shall not be greater than 10mm. Before laying the heating cable, the model and specification of the heating cable should be checked according to the construction drawings, and the appearance quality of the cable should be checked.

(2) After the heating cable leaves the factory, it is forbidden to cut and splice, and it is forbidden to lay the heating cable with trauma or damage.

(3) Before installation, measure the nominal resistance and insulation resistance of the heating cable, and make self-inspection records.

(4) Before heating cable construction, it should be confirmed that the reserved pipes for cable cold line, temperature controller junction box, floor heating sensor and heating distribution box have been reserved and embedded.

(5) The bending radius of the cable shall not be less than the specified limit, and shall not be less than 6 times of the outer diameter of the cable.

(6) The heating cable can be laid with integral glass fiber grid heating cable (the width of glass fiber grid is 1000500, two kinds), or it can be fixed with steel mesh and tie. If the heating cable is made of glass fiber mesh, its cutting and switching direction shall be in strict accordance with the design requirements and shall not be damaged. It is forbidden to press into the heat preservation material.

(7) The hot wire part of the heating cable is forbidden to enter the reserved tube of cold wire to prevent the hot wire from heating in the sleeve, which will affect the service life and safety performance. (8) The cold and hot wire connector of heating cable shall be located in the filling layer.

(9) After the heating cable is installed, the nominal resistance and insulation resistance of the heating cable shall be tested and recorded.

(10) The technical requirements for the ground temperature of heating cable are: line length 1.5m, voltage 220V, current 16(4) amp, and temperature limit range of 20-55 degrees Celsius.

(1 1) The temperature controller of the heating cable shall be installed horizontally and firmly fixed. The thermostat should be located in a well-ventilated place that is not directly blown by the wind, and is not covered by furniture. There should be no heat source around the thermostat.

(12) When installing the heating cable thermostat, the heating cable should be reliably grounded.

(13) The laying of a single mask must be controlled within 40m2, and 90% laying is 36m2. Therefore, if the area exceeds 40 square meters, it can only be laid in blocks, and expansion joints should be reserved, and the setting of expansion joints should comply with the regulations.

(14) If two or more heating cables are used in the same room, try to choose cables with the same or similar size, and strictly control them not to be large, only small, and the smaller range is generally 3%-5%.

(15) heating cable laying, the length shall be controlled within 7m, and the winding width shall not exceed 3m.

(16) PE film is required to be laid on the ground insulation layer, with a thickness of 0.2 mm, a joint lap of at least 200mm and a wall height of at least 200 mm.

(17) Prevent the fire line from heating above the ground, which may cause potential safety hazards. At the same time, it is difficult to ensure the distance between cables after leaving the ground. Therefore, the hot wire and its connector should be in the filling layer, not above the ground.

3.4 Construction of Filling Layer

3.4. 1 Construction of concrete filling layer shall meet the following conditions:

(1) The heating cable has passed the resistance test and insulation performance test.

(2) All expansion joints have been installed.

(3) The installation box of thermostat and the cold threading of heating cable have been arranged.

(4) Pass the acceptance of concealed works

3.4.2 The construction of concrete filling layer shall be undertaken by a qualified civil contractor, but the heating system installation unit shall cooperate closely.

3.4.3 In the construction of concrete filling layer, it is forbidden to use mechanical vibrating equipment; Construction personnel should wear soft-soled shoes and use flat-headed shovels.

3.4.4 In the laying area of heat tracing cable, it is forbidden to drill holes or nail.

3.4.5 Before the initial test of the system, the curing period of the concrete filling layer shall not be less than 28 days. During construction, protective measures should be taken for the ground, and it is not allowed to overload, bake at high temperature or directly place high-temperature heating equipment on the ground. It will take 48 hours at the earliest to step on it.

3.4.6 After the filling layer construction is completed, the nominal resistance and insulation resistance of the heating cable shall be tested, accepted and recorded.

3.5 surface structure

3.5. 1 The following materials shall be used for paving the ground.

(1) cement mortar, concrete floor

(2) Tiles (2), marble, granite and other floors

(3) Composite wood flooring, solid wood flooring and heat-resistant solid wood flooring that meet national standards.

3.5.2 Before the surface course construction, the packing layer should reach the dryness required by the surface course. Surface construction shall meet the requirements of construction design drawings and the following requirements.

(1) During surface construction, it is forbidden to chisel, cut, drill or nail the filling layer, and nothing is allowed to be inserted into the filling layer.

(2) The surface layer construction can only be carried out after the filling layer reaches the required strength.

(3) At the junction of vertical components such as internal and external walls and columns, stone and brick expansion joints with a width of 10mm should be reserved; When laying the wooden floor, there should be an expansion joint not less than14 mm. The expansion joint shall be higher than the upper surface of the decorative layer 10-20mm from the upper edge of the filling layer. After the decorative layer is laid, the excess parts should be cut off. Expansion joints shall be filled with high foaming polyethylene foam.

3.5.3 When wooden boards are used as the surface layer, the wood should be dry, and the filling layer and leveling layer should be completely dry before construction.

3.5.4 When the surface of ceramic tile, marble and granite is constructed, dry paste shall be used at the expansion joint.

3.6 toilet construction

3.6. 1 The toilet should have two isolation layers.

3.6.2 A water-stop wall should be set at the entrance of the toilet, and the inside of the water-stop wall should cooperate with the civil engineering to be waterproof. Waterproof measures should be taken where the heating cable passes through the water stop wall. 4. 1 Before starting the heating system every year, the following inspections shall be carried out:

4. 1. 1 Whether the temperature control switch and electrical circuit are normal.

4. 1.2 Whether the sealing performance of doors and windows is good.

4.2 Run the operating procedures:

4.2. 1 The geothermal cable intelligent heating system can only be put into use after the concrete is poured (at least 4 weeks later) and the ground cement mortar is naturally dried. Never use this system to dry and heat cement mortar before it dries.

4.2.2 When starting the geothermal cable radiant heating system, first set the thermostat to the required ground temperature. When the ground (room temperature) temperature is lower than the set temperature, the geothermal cable radiant heating system will start without stopping heating. When the temperature probe in the thermostat detects that the ground temperature (indoor air temperature) is equal to the set temperature of the thermostat, the geothermal cable radiant heating system will automatically stop heating.

4.2.3 When the geothermal cable radiant heating is started for the first time, the ground temperature (room temperature) should not actually exceed 5℃, and the use time should not be too long. For this system, the temperature should be raised for a long time, about 5℃ every day.

4.2.4 Before people leave the room for a long time, the thermostat should be set to a lower temperature value to reduce the power consumption of the system.

4.2.5 In the non-heating season of spring, summer and autumn, cut off the power supply and turn the thermostat knob so that the pointer on the thermostat knob points to the minimum temperature setting value of the thermostat.