Analīze princips princips of pretestība apkure ar elektriskie sildītāji in ikdienas kalpošanas laiks

Analīze princips princips of pretestība apkure ar elektriskie sildītāji in ikdienas kalpošanas laiks

Princips of elektriskais sildītājs pretestība apkure ir to use the Joule efekts of strāva to pārveidot elektrība enerģija par siltums objekti. Parasti sadalīts iekšā tiešā pretestība apkure un netieša pretestība apkure.

Jauda spriegums of tiešā pretestība apkure ir tieši pielietots uz uz apsildāms objekts. Kad ir ir strāva plūst caur tas apsildāms objekts pats, the objekts apsildāms by tieša pretestība jābūt a vadītājs, bet tas jābūt jābūt a augstai elektriskai pretestībai. Dēļ to siltums radīts by the apsildāms objekts pats, it pieder to iekšējai apkurei un ir augsta termiska efektivitāte. Piemēram piemērs, an elektriskā apkure gludināšana mašīna ģenerē siltums.

Indirect resistance heating requires heating elements made of specialized alloy or non-metallic materials, which generate heat energy and transmit it to the heated object through radiation, convection, and conduction. Due to the fact that the heated object and heating element are divided into two parts, the type of heated object is generally unrestricted and easy to operate. The materials used for indirect resistance heating heating heating elements generally require high resistivity, low resistance temperature coefficient, small deformation at high temperatures, and are not easily brittle. Commonly used are metal materials such as iron aluminum alloy and nickel chromium alloy, as well as non-metallic materials such as silicon carbide and molybdenum disilicide. The maximum working temperature of metal heating elements can reach 1000-1500 degree depending on the type of material; The maximum operating temperature of non-metallic heating elements can reach 1500~1700 degree . The latter is easy to install and can be replaced by a hot furnace, but it requires a pressure regulating device during operation and has a shorter lifespan than alloy heating elements. It is generally used in high-temperature furnaces, places where the temperature exceeds the maximum allowable working temperature of metal heating elements, and certain special occasions. For example: heating pipes, stainless steel electric heating pipes, ceramic heaters, etc.

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