Infrared Underfloor Heater Wire

The heating rate of the heating cable does not meet the standard, and the core reasons are concentrated in four categories: insufficient power matching, heat transfer loss, installation process defects, and environmental interference. Specific investigations can be conducted according to the following dimensions:     1、 Power matching issue: core cause, insufficient heating capacity   The total power or power density of the heating cable does not meet the design requirements and cannot provide sufficient heat quickly. The total power is lower than the design value Phenomenon: The actual total power of the cable is less than the design value, and the heating capacity is insufficient. Common causes: incorrect cable selection, actual laying length shorter than the design length, and some cables in multi circuit systems not being powered on. Troubleshooting method: Use a power meter to measure the power of a single cable or total circuit, and compare it with the design documents. Uneven distribution of power density Phenomenon: The distance between cables in local areas is too large, the heating power per unit area is insufficient, and the overall temperature rise slows down. Typical scenario: During ground heating, the cable laying in the corners and edges of the wall is too loose, resulting in a slow overall heating up; When insulating pipelines, the spiral winding spacing suddenly widens, and the local heating density is insufficient.       2、 Heat transfer loss: Heat is lost too quickly and cannot be effectively accumulated   The heat is not fully transferred to the controlled object (ground, pipeline), but instead is lost through insulation layers, gaps, etc., resulting in low heating efficiency. Failure of insulation/thermal insulation layer Ground heating scenario: Insufficient insulation layer thickness (such as 20mm in design, 10mm in reality), cracks or loose splicing (not sealed with tape), heat seeps down to the floor slab and cannot accumulate upwards. Pipeline insulation scenario: The insulation cotton is not tightly wrapped around the pipeline, the thickness is insufficient, or there is no outer protective layer, and the heat is carried away by the cold air. Construction defects in the filling layer (ground heating) The thickness of the filling layer (cement mortar) is too thick (such as 50mm in design, 80mm in reality), which prolongs the heat conduction path and significantly prolongs the heating time; The filling layer is not properly cured, there are pores inside, and the thermal conductivity efficiency decreases; Too many stones and impurities are mixed into the filling layer, resulting in poor thermal conductivity and inability to quickly transfer heat to the surface. The cable is not tightly attached to the controlled object When the pipeline is insulated, the cable is not fixed on the surface of the pipeline with aluminum foil tape, resulting in suspension (such as cable detachment caused by pipeline protrusion) and low heat transfer efficiency; When heating on the ground, the cable gets stuck in the gap of the insulation layer and has insufficient contact with the filling layer, which hinders heat transfer.     3、 Installation process and equipment failure: affecting heat output efficiency   Improper installation or equipment malfunction can cause the cable to be unable to output heat properly, indirectly slowing down the heating rate. Partial cable malfunction The internal heating wire of the cable is broken, and the joint is virtual (such as the cold end joint is not welded firmly), resulting in some sections not heating or a decrease in heating power; After the insulation layer of the cable is damaged, water enters, causing a local short circuit and triggering the leakage protection switch to frequently trip, making it impossible to continue heating. Temperature controller setting or linkage failure The set temperature of the thermostat is too low and the hysteresis is too large, resulting in frequent start stop of the cable and inability to continue heating up; Improper positioning of the temperature controller sensor (such as sticking to the surface of the cable, mistakenly measuring high temperature), cutting off the power supply in advance, and the actual room temperature not meeting the standard; The output power of the thermostat is insufficient to drive the cable to operate at full power. Power and wiring issues Insufficient power supply voltage leads to a decrease in the actual power of the cable; The wire diameter of the line is too thin and the wiring terminals are virtual, resulting in excessive line loss, insufficient voltage at the cable end, and reduced heating efficiency.       4、 Environmental interference: Excessive external cooling load offsets heat The low temperature and airflow in the external environment continue to consume the heat generated by the cable, resulting in slow heating. The initial ambient temperature is too low When the initial room temperature is lower than the standard during testing, the cable needs to first offset the cooling load and then raise the temperature to the target temperature, which naturally extends the time. Severe cold source infiltration The doors and windows in the heating area are not sealed, and cold air continues to infiltrate, taking away heat; Ground heating areas located near exterior walls, windows, or exposed pipes outdoors (without anti freezing insulation) can experience rapid heat loss due to cold radiation. Influence of airflow or coverings There are exhaust fans and air conditioning cold air in industrial workshops and large spaces, which accelerate air flow and dissipate heat too quickly; The ground heating area is covered with large carpets and large furniture, which prevents heat from dissipating and accumulates under the coverings, slowing down the surface heating.