{"id":41297,"date":"2019-09-26T19:25:35","date_gmt":"2019-09-26T18:25:35","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/que-es-la-formula-de-la-entalpia-ecuacion-definicion\/"},"modified":"2020-01-14T14:08:17","modified_gmt":"2020-01-14T13:08:17","slug":"que-es-la-formula-de-la-entalpia-ecuacion-definicion","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/es\/que-es-la-formula-de-la-entalpia-ecuacion-definicion\/","title":{"rendered":"Qu\u00e9 es la f\u00f3rmula de la entalp\u00eda &#8211; Ecuaci\u00f3n &#8211; Definici\u00f3n"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">La entalp\u00eda est\u00e1 representada por el s\u00edmbolo H, y el cambio en la entalp\u00eda en un proceso es H2 &#8211; H1.\u00a0Existen f\u00f3rmulas de entalp\u00eda en t\u00e9rminos de variables m\u00e1s familiares, como la temperatura y la presi\u00f3n.<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>F\u00f3rmulas de entalp\u00eda en unidades extensas<\/h2>\n<figure id=\"attachment_16538\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16538\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Extensive-vs.-Intensive-properties-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16538 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Extensive-vs.-Intensive-properties-min-238x300.png\" alt=\"Propiedades termodin\u00e1micas extensivas versus intensivas\" width=\"238\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Extensive-vs.-Intensive-properties-min-238x300.png\" \/><\/a><figcaption id=\"caption-attachment-16538\" class=\"wp-caption-text\">Propiedades extensivas e intensivas del medio en el presurizador.<\/figcaption><\/figure>\n<p><em><strong>H = U + pV<\/strong><\/em><\/p>\n<p><a title=\"\u00bfQu\u00e9 es la entalp\u00eda?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-enthalpy\/\"><strong>La entalp\u00eda<\/strong><\/a>\u00a0\u00a0es una cantidad extensa, depende del tama\u00f1o del sistema o de la cantidad de sustancia que contiene.\u00a0La unidad de entalp\u00eda del SI es el joule (J).\u00a0Es la energ\u00eda contenida dentro del sistema, excluyendo la energ\u00eda cin\u00e9tica de movimiento del sistema como un todo y la energ\u00eda potencial del sistema como un todo debido a los campos de fuerza externos.\u00a0Es la cantidad termodin\u00e1mica equivalente al<strong>\u00a0contenido<\/strong>\u00a0de<strong>\u00a0calor total<\/strong>\u00a0de un sistema.<\/p>\n<p>Por otro lado, la energ\u00eda puede almacenarse en los enlaces qu\u00edmicos entre los \u00e1tomos que forman las mol\u00e9culas.\u00a0Este almacenamiento de energ\u00eda a nivel at\u00f3mico incluye energ\u00eda asociada con estados orbitales de electrones, esp\u00edn nuclear y fuerzas de uni\u00f3n en el n\u00facleo.<\/p>\n<p><strong>La entalp\u00eda<\/strong>\u00a0est\u00e1 representada por el s\u00edmbolo\u00a0<strong>H<\/strong>\u00a0, y el cambio en la entalp\u00eda en un proceso es\u00a0<strong>H\u00a0<sub>2<\/sub>\u00a0&#8211; H\u00a0<sub>1<\/sub><\/strong>\u00a0.<\/p>\n<p>Hay\u00a0<strong>f\u00f3rmulas de entalp\u00eda\u00a0<\/strong>\u00a0en t\u00e9rminos de variables m\u00e1s familiares como la\u00a0<a title=\"\u00bfQu\u00e9 es la temperatura? F\u00edsica\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-la-temperatura-fisica-definicion\/\">temperatura<\/a>\u00a0y la\u00a0<a title=\"\u00bfQu\u00e9 es la presi\u00f3n? - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/\">presi\u00f3n<\/a>\u00a0:<\/p>\n<p><em><strong>dH = C\u00a0<sub>p<\/sub>\u00a0dT + V (1-\u03b1T) dp<\/strong><\/em><\/p>\n<p>Donde\u00a0<strong>C\u00a0<sub>p<\/sub><\/strong>\u00a0es la\u00a0<strong>capacidad calor\u00edfica a presi\u00f3n constante<\/strong>\u00a0y\u00a0<strong><em>\u03b1<\/em><\/strong>\u00a0es el coeficiente de expansi\u00f3n t\u00e9rmica (c\u00fabica).\u00a0Para gas ideal \u03b1T = 1 y por lo tanto:<\/p>\n<p><em><strong>dH = C\u00a0<sub>p<\/sub>\u00a0dT<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<h2><span>F\u00f3rmulas de entalp\u00eda en unidades intensivas &#8211; Entalp\u00eda espec\u00edfica<\/span><\/h2>\n<p><span>La\u00a0<\/span><strong><span>entalp\u00eda<\/span><\/strong><span>\u00a0se puede convertir en una\u00a0variable\u00a0<\/span><strong><span>intensiva<\/span><\/strong><span>\u00a0o\u00a0<\/span><strong><span>espec\u00edfica<\/span><\/strong><span>\u00a0dividi\u00e9ndola por la\u00a0<\/span><a title=\"\u00bfQu\u00e9 es la misa?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-mass-and-weight\/what-is-mass\/\"><span>masa<\/span><\/a><span>\u00a0.\u00a0<\/span><strong><span>Los ingenieros usan la\u00a0<\/span><\/strong><strong><span>entalp\u00eda espec\u00edfica<\/span><\/strong><span>\u00a0en el an\u00e1lisis termodin\u00e1mico m\u00e1s que la entalp\u00eda misma.\u00a0La entalp\u00eda espec\u00edfica (h) de una sustancia es su entalp\u00eda por unidad de masa.\u00a0Es igual a la entalp\u00eda total (H) dividida por la masa total (m).<\/span><\/p>\n<p><strong><em><span>h = H \/ m<\/span><\/em><\/strong><\/p>\n<p><span>d\u00f3nde:<\/span><\/p>\n<p><span>h = entalp\u00eda espec\u00edfica (J \/ kg)<\/span><\/p>\n<p><span>H = entalp\u00eda (J)<\/span><\/p>\n<p><span>m = masa (kg)<\/span><\/p>\n<p><span>Tenga en cuenta que la entalp\u00eda es la cantidad termodin\u00e1mica equivalente al\u00a0<\/span><strong><span>contenido total de calor<\/span><\/strong><span>\u00a0de un sistema.\u00a0La entalp\u00eda espec\u00edfica es igual a la\u00a0<\/span><a title=\"Energ\u00eda interna espec\u00edfica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/internal-energy-thermal-energy\/specific-internal-energy\/\"><span>energ\u00eda interna espec\u00edfica<\/span><\/a><span>\u00a0del sistema m\u00e1s el producto de\u00a0<\/span><a title=\"\u00bfQu\u00e9 es la presi\u00f3n? - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/\"><span>presi\u00f3n<\/span><\/a><span>\u00a0y\u00a0<\/span><a title=\"\u00bfQu\u00e9 es el volumen espec\u00edfico?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-specific-volume\/\"><span>volumen espec\u00edfico<\/span><\/a><span>\u00a0.<\/span><\/p>\n<p><em><strong><span>h = u + pv<\/span><\/strong><\/em><\/p>\n<p><span>En general, la entalp\u00eda es una\u00a0<\/span><strong><span>propiedad de una sustancia<\/span><\/strong><span>\u00a0, como la presi\u00f3n, la temperatura y el volumen, pero no se puede medir directamente.\u00a0Normalmente, la entalp\u00eda de una sustancia se da con respecto a alg\u00fan valor de referencia.\u00a0Por ejemplo, la entalp\u00eda espec\u00edfica de agua o vapor se da usando la referencia de que la entalp\u00eda espec\u00edfica de agua es\u00a0<\/span><strong><span>cero a 0.01 \u00b0 C<\/span><\/strong><span>\u00a0y\u00a0<\/span><a title=\"Presi\u00f3n atmosf\u00e9rica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/atmospheric-pressure\/\"><strong><span>presi\u00f3n atmosf\u00e9rica normal<\/span><\/strong><\/a><span>\u00a0, donde\u00a0<\/span><strong><span>h\u00a0<\/span><sub><span>L<\/span><\/sub><span>\u00a0= 0.00 kJ \/ kg<\/span><\/strong><span>\u00a0.\u00a0Sin embargo, el hecho de que se desconozca el valor absoluto de la entalp\u00eda espec\u00edfica no es un problema, porque es el\u00a0<\/span><strong><span>cambio en la entalp\u00eda espec\u00edfica (\u2206h)<\/span><\/strong><span>\u00a0y no el valor absoluto lo que es importante en los problemas pr\u00e1cticos.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>F\u00f3rmulas para entalp\u00eda espec\u00edfica de vapor h\u00famedo<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/wet-steam-Vapor-liquid-mixture-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16093 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/wet-steam-Vapor-liquid-mixture-min-300x256.png\" alt=\"h\u00famedo-vapor-vapor-l\u00edquido-mezcla-min\" width=\"300\" height=\"256\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/wet-steam-Vapor-liquid-mixture-min-300x256.png\" \/><\/a><span>La\u00a0<\/span><strong><span>entalp\u00eda espec\u00edfica de agua l\u00edquida saturada<\/span><\/strong><span>\u00a0(x = 0) y\u00a0<\/span><a title=\"Vapor seco\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/dry-steam\/\"><strong><span>vapor seco<\/span><\/strong><\/a><span>\u00a0(x = 1) se puede recoger de las mesas de vapor.\u00a0En caso de\u00a0<\/span><a title=\"Vapor h\u00famedo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/wet-steam\/\"><strong><span>vapor h\u00famedo<\/span><\/strong><\/a><span>\u00a0, la entalp\u00eda real se puede calcular con la\u00a0<\/span><a title=\"Calidad de vapor - Fracci\u00f3n de sequedad\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/vapor-quality-dryness-fraction\/\"><span>calidad<\/span><\/a><span>\u00a0del\u00a0<a title=\"Calidad de vapor - Fracci\u00f3n de sequedad\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/vapor-quality-dryness-fraction\/\">vapor,\u00a0<\/a><\/span><em><a title=\"Calidad de vapor - Fracci\u00f3n de sequedad\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/vapor-quality-dryness-fraction\/\"><span>x<\/span><\/a><span>\u00a0,<\/span><\/em><span>\u00a0y las entalp\u00edas espec\u00edficas de agua l\u00edquida saturada y vapor seco:<\/span><\/p>\n<p><em><span>h\u00a0<\/span><\/em><em><sub><span>h\u00famedo<\/span><\/sub><\/em><em><span>\u00a0= h\u00a0<\/span><\/em><em><sub><span>s<\/span><\/sub><\/em><em><span>\u00a0x + (1 &#8211; x) h\u00a0<\/span><\/em><em><sub><span>l<\/span><\/sub><\/em><em>\u00a0\u00a0\u00a0\u00a0\u00a0<\/em><em>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/em><\/p>\n<p><em><span>d\u00f3nde<\/span><\/em><\/p>\n<p><em><span>h\u00a0<\/span><\/em><em><sub><span>h\u00famedo<\/span><\/sub><\/em><em><span>\u00a0= entalp\u00eda de vapor h\u00famedo (J \/ kg)<\/span><\/em><\/p>\n<p><em><span>h\u00a0<\/span><\/em><em><sub><span>s<\/span><\/sub><\/em><em><span>\u00a0= entalp\u00eda de vapor &#8220;seco&#8221; (J \/ kg)<\/span><\/em><\/p>\n<p><em><span>h\u00a0<\/span><\/em><em><sub><span>l<\/span><\/sub><\/em><em><span>\u00a0= entalp\u00eda de agua l\u00edquida saturada (J \/ kg)<\/span><\/em><\/p>\n<p><span>Como se puede ver, el vapor h\u00famedo siempre tendr\u00e1 una entalp\u00eda m\u00e1s baja que el vapor seco.<\/span><\/p>\n<p><strong><span>Ejemplo:<\/span><\/strong><\/p>\n<figure id=\"attachment_16026\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16026\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermodynamic-Cycles-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16026 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermodynamic-Cycles-min-300x277.png\" alt=\"termodin\u00e1mica de ingenier\u00eda\" width=\"300\" height=\"277\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermodynamic-Cycles-min-300x277.png\" \/><\/a><figcaption id=\"caption-attachment-16026\" class=\"wp-caption-text\"><span>Ciclo de Rankine &#8211; Termodin\u00e1mica como ciencia de conversi\u00f3n de energ\u00eda<\/span><\/figcaption><\/figure>\n<p><span>Una etapa de alta presi\u00f3n de la turbina de vapor funciona en estado estable con condiciones de entrada de 6 MPa, t = 275.6 \u00b0 C, x = 1 (punto C).\u00a0El vapor sale de esta etapa de la turbina a una presi\u00f3n de 1,15 MPa, 186 \u00b0 C yx = 0,87 (punto D).\u00a0Calcule la diferencia de entalp\u00eda entre estos dos estados.<\/span><\/p>\n<p><span>La entalp\u00eda para el estado C puede seleccionarse directamente de las tablas de vapor, mientras que la entalp\u00eda para el estado D debe calcularse utilizando la calidad del vapor:<\/span><\/p>\n<p><strong><em><span>h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>1, h\u00famedo<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0=<\/span><\/em><\/strong><strong><span>\u00a02785 kJ \/ kg<\/span><\/strong><\/p>\n<p><strong><em><span>h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>2, h\u00famedo<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>2, s<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0x + (1 &#8211; x) h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>2, l<\/span><\/sub><\/em><\/strong><span>\u00a0\u00a0= 2782.\u00a00.87 + (1 &#8211; 0.87).\u00a0790 = 2420 + 103 =<\/span><strong><span>\u00a02523 kJ \/ kg<\/span><\/strong><\/p>\n<p><strong><span>\u0394h = 262 kJ \/ kg<\/span><\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este art\u00edculo se basa en la traducci\u00f3n autom\u00e1tica del art\u00edculo original en ingl\u00e9s. Para m\u00e1s informaci\u00f3n vea el art\u00edculo en ingl\u00e9s. Puedes ayudarnos. Si desea corregir la traducci\u00f3n, env\u00edela a: translations@nuclear-power.com o complete el formulario de traducci\u00f3n en l\u00ednea. Agradecemos su ayuda, actualizaremos la traducci\u00f3n lo antes posible. Gracias.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La entalp\u00eda est\u00e1 representada por el s\u00edmbolo H, y el cambio en la entalp\u00eda en un proceso es H2 &#8211; H1.\u00a0Existen f\u00f3rmulas de entalp\u00eda en t\u00e9rminos de variables m\u00e1s familiares, como la temperatura y la presi\u00f3n. F\u00f3rmulas de entalp\u00eda en unidades extensas Propiedades extensivas e intensivas del medio en el presurizador. H = U + &#8230; <a title=\"Qu\u00e9 es la f\u00f3rmula de la entalp\u00eda &#8211; Ecuaci\u00f3n &#8211; Definici\u00f3n\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-la-formula-de-la-entalpia-ecuacion-definicion\/\" aria-label=\"M\u00e1s en Qu\u00e9 es la f\u00f3rmula de la entalp\u00eda &#8211; Ecuaci\u00f3n &#8211; Definici\u00f3n\">Leer m\u00e1s<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu\u00e9 es la f\u00f3rmula de la entalp\u00eda - Ecuaci\u00f3n - Definici\u00f3n<\/title>\n<meta name=\"description\" content=\"La entalp\u00eda est\u00e1 representada por el s\u00edmbolo H, y el cambio en la entalp\u00eda en un proceso es H2 - H1. 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