{"id":73901,"date":"2026-10-22T08:15:35","date_gmt":"2026-10-22T06:15:35","guid":{"rendered":"https:\/\/www.km77.com\/revista\/?p=73901"},"modified":"2026-10-22T08:19:46","modified_gmt":"2026-10-22T06:19:46","slug":"calefaccion-tarda-calentar-motivo","status":"publish","type":"post","link":"https:\/\/www.km77.com\/revista\/engendro-mecanico\/calefaccion-tarda-calentar-motivo\/","title":{"rendered":"Por qu\u00e9 la calefacci\u00f3n tarda en calentar"},"content":{"rendered":"\n

Durante las ma\u00f1anas de invierno, una de las costumbres m\u00e1s extendidas entre los conductores es la de poner en marcha el veh\u00edculo y encender de inmediato la climatizaci\u00f3n<\/strong> a la m\u00e1xima temperatura y velocidad del ventilador. La consecuencia inmediata suele ser una corriente de aire g\u00e9lido dirigida hacia el habit\u00e1culo que no solo no aporta confort t\u00e9rmico, sino que retrasa el calentamiento general del sistema.<\/p>\n\n\n\n

A diferencia del aire acondicionado, que recurre a un compresor dedicado capaz de generar fr\u00edo en cuesti\u00f3n de segundos mediante la compresi\u00f3n y expansi\u00f3n de un gas refrigerante, la calefacci\u00f3n convencional en un coche con motor de combusti\u00f3n interna es un sistema de aprovechamiento energ\u00e9tico estrictamente pasivo.<\/strong><\/p>\n\n\n\n

Calor residual, masa met\u00e1lica e inercia del refrigerante<\/h2>\n\n\n\n

El sistema de calefacci\u00f3n tradicional no genera energ\u00eda t\u00e9rmica de forma aut\u00f3noma, sino que aprovecha el\u00a0calor residual<\/strong>\u00a0derivado de las p\u00e9rdidas termodin\u00e1micas de la combusti\u00f3n. En un propulsor t\u00e9rmico, aproximadamente dos tercios de la energ\u00eda del carburante se pierden en forma de calor o a trav\u00e9s de los gases de escape y del propio motor.<\/p>\n\n\n\n

Para transferir parte de esa energ\u00eda al interior del coche, el circuito de refrigeraci\u00f3n deriva una bifurcaci\u00f3n hacia el habit\u00e1culo mediante conductos que conectan con un peque\u00f1o radiador secundario: el\u00a0intercambiador de calor de la calefacci\u00f3n<\/strong> (que suele estar bajo el salpicadero).<\/p>\n\n\n\n

Sin embargo, cuando el veh\u00edculo ha permanecido horas a baja temperatura ambiental:<\/p>\n\n\n\n

    \n
  • El bloque motor y la culata (de fundici\u00f3n de hierro o aleaci\u00f3n de aluminio) pesan entre 80 y 180 kilogramos y se encuentran a la misma temperatura que el exterior (por ejemplo, a\u00a00\u00a0\u00b0C).<\/li>\n\n\n\n
  • En los primeros minutos, casi la totalidad de la energ\u00eda liberada por las detonaciones se absorbe en calentar las partes met\u00e1licas del motor<\/strong> y el aceite de lubricaci\u00f3n, cuya viscosidad cinem\u00e1tica debe reducirse r\u00e1pidamente para proteger cojinetes y cilindros.<\/li>\n\n\n\n
  • El refrigerante que circula hacia el radiador de la calefacci\u00f3n permanece fr\u00edo. Si en ese instante se acciona el ventilador de la calefacci\u00f3n a gran velocidad, el flujo forzado de aire exterior enfr\u00eda todav\u00eda m\u00e1s el intercambiador, extrayendo el poco calor acumulado y devolviendo un aire totalmente fr\u00edo al habit\u00e1culo.<\/li>\n<\/ul>\n\n\n\n
    \"\"<\/figure>\n\n\n\n

    Qu\u00e9 m\u00e1s tener en cuenta<\/h2>\n\n\n\n

    Para optimizar el calentamiento del propulsor y reducir las emisiones contaminantes en fase fr\u00eda, el circuito de refrigeraci\u00f3n est\u00e1 gobernado por una v\u00e1lvula termost\u00e1tica: el termostato<\/strong>.<\/p>\n\n\n\n

    Mientras la temperatura del l\u00edquido refrigerante no alcanza su cota operativa (habitualmente tarada entre los\u00a082\u00a0\u00b0C\u00a0y los\u00a090\u00a0\u00b0C), el termostato permanece cerrado, bloqueando el paso hacia el radiador principal frontal para no enfriar el motor con el aire de marcha. Aunque el circuito secundario que alimenta la calefacci\u00f3n interior suele permanecer abierto para permitir la circulaci\u00f3n, forzar la ventilaci\u00f3n del habit\u00e1culo en esta fase roba calor\u00edas cr\u00edticas al bloque<\/strong>, prolongando el tiempo que el motor tarda en alcanzar su temperatura \u00f3ptima de servicio y elevando el consumo de combustible.<\/strong><\/p>\n\n\n\n

    En los motores Diesel modernos y en los de gasolina de baja cilindrada con inyecci\u00f3n directa, este retardo t\u00e9rmico se acent\u00faa a\u00fan m\u00e1s debido a su elevado rendimiento termodin\u00e1mico: disipan muy poco calor al refrigerante cuando ruedan al ralent\u00ed o a baja carga en ciudad. Para mitigar este problema, muchos fabricantes incorporan en el m\u00f3dulo de ventilaci\u00f3n\u00a0resistencias calefactoras auxiliares cer\u00e1micas de tipo PTC<\/strong>\u00a0(Positive Temperature Coefficient). Estos elementos el\u00e9ctricos consumen entre 800 y 1.200 vatios de la red de a bordo para templar el flujo de aire en uno o dos minutos<\/strong>, sirviendo de puente t\u00e9rmico hasta que el circuito hidr\u00e1ulico asume por completo la demanda.<\/p>\n\n\n\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

    Durante las ma\u00f1anas de invierno, una de las costumbres m\u00e1s extendidas entre los conductores es la de poner en marcha el veh\u00edculo y encender de inmediato la climatizaci\u00f3n a la m\u00e1xima temperatura y velocidad del ventilador. La consecuencia inmediata suele ser una corriente de aire g\u00e9lido dirigida hacia el habit\u00e1culo que no solo no aporta […]<\/p>\n","protected":false},"author":93,"featured_media":73905,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[3912],"tags":[7975,22],"class_list":["post-73901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-engendro-mecanico","tag-de-todo-un-poco","tag-general"],"yoast_head":"\nPor qu\u00e9 la calefacci\u00f3n tarda en calentar<\/title>\n<meta name=\"description\" content=\"Explicamos por qu\u00e9 la calefacci\u00f3n del coche no calienta nada tras arrancar: la inercia t\u00e9rmica del bloque motor, el papel del termostato y las resistencias cer\u00e1micas PTC.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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