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Fase 5 Conclusión
Se puede concluir del ejercicio realizado que la energía eólica utilizada para diferentes actividades desde hace varios siglos, permite entre otras cosas a crear energía sin contaminar el medio ambiente. Para el ejercicio específico se determina que la Potencia es de 181 kW y los ingresos generados llenan a $95,130 por año.
Se bombea agua desde un pozo de 200 pies de profundidad, hasta un recipiente de almacenamiento de 100 pies de altura. Calcule la potencia, en kW, que se necesitaría para bombear 200 galones por minuto.
Fase I Análisis o
Tipo de fenómeno:
Potencia eléctrica: Potencia es la velocidad a la que se consume la energía. También se puede definir Potencia como la energía desarrollada o consumida en una unidad de tiempo, expresada en la fórmula:
o
Información:
o
h: 200 pies de profundidad
o
v: 100 pies de altura
o
m: 200 galones/Min
o
La densidad del agua es de
Fase II Objetivos y Metas
.
Calcular la potencia, en kW, que se necesitaría para bombear 200 galones por minuto.
Fase III Conocimiento (Modelación física matemática)
Fase IV Desarrollo (cálculos)
= = = =
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=8342∗ =8342∗ 737.516 ∗ = 11.3
Fase 5 Conclusión
La potencia que se necesitaría para bombear 200 galones por minuto es de 11.3 Kw
En una central hidroeléctrica bajan 65 m3/s de agua, desde una altura de 90 m, hasta una turbina generadora de electricidad. La eficiencia general del turbogenerador es 84 por ciento. Sin tener en cuenta las pérdidas por fricción en la tubería, calcule la producción de potencia en esta planta.
Fase I Análisis
o
Tipo de fenómeno:
Potencia eléctrica: Potencia es la velocidad a la que se consume la energía. También se puede definir Potencia como la energía desarrollada o consumida en una unidad de tiempo, expresada en la fórmula:
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Los niveles de agua permanecen constantes
Las pérdidas friccionales en la tubería son insignificantes
Densidad del agua:
Fase II Objetivos y Metas
=1000 = 1
Calcular la producción de potencia en esta planta.
Fase III Conocimiento (Modelación física matemática)
=1000 = 1
Fase IV Desarrollo (cálculos)
1 ===9.81 9090 1000 =0.8829 ==1000 65 =65.000 = = ===65.000 0.8829 10001 = 57.57.39 = ∗ =0.84457.57.39 =48.2 Fase 5 Conclusión
Análisis La energía mecánica total que posee el agua en una presa es equivalente a la energía potencial del agua en la superficie libre de la presa (en relación con la superficie libre del agua de descarga), y puede convertirse completamente en trabajo. Por lo tanto, el potencial de potencia del agua es su energía potencial, que es gz por unidad de masa, y mgz para un caudal de masa dado.
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Una tarjeta de circuito tiene 10 cm de altura y 20 cm de ancho, contiene 100 chips muy juntos; cada uno genera calor, a una tasa de 0.08 W, y lo transfiere por convección al aire que lo rodea, que está a 25°C. La transferencia de calor de la cara posterior de la tarjeta es despreciable. Si el coeficiente de transferencia de calor por convección, en la superficie anterior es 10 W/ . °C, y es despreciable la transferencia de calor por radiación, la temperatura superficial promedio de los chips es.
m
a) 26°C b) 45°C c) 15°C d) 80°C
Fase 1: Análisis
Tipo de fenómeno:
Transferencia de calor.
Información:
ℎ == 1200 ∞==0,2085° = = 10 W/m W/m.
Fase 2: Objetivos y Metas
Calcular la temperatura superficial promedio de los chips.
Fase 3: Conocimiento (Modelación física matemática)
Fase 4: Desarrollo (cálculos)
= = ∞
1. Multiplicamos la altura por el ancho de la tarjeta de circuito para obtener el área total de la misma.
= 0.10∗0 ∗ 0.02=2 = 0,30m.
2. Hallamos el flujo total de calor
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4. Procedemos hallar la temperatura superficial promedio promedio de los chips usando la formula
25°8 = = ∞ = =5.67 3 5. 6 725° = = ∞ = 3 =5.67
Fase 5 Conclusión
Se logró calcular la temperatura superficial promedio
Realice una investigación donde revise los conceptos de contaminación termina y su estado actual.
Fase 1: Análisis
Tipo de fenómeno:
Conceptos de contaminación termina y su estado actual.
Información:
Fase 2: Objetivos y Metas
Realizar una investigación donde revise los conceptos de contaminación termina y su estado actual.
Fase 4: Desarrollo (cálculos)
¿Qué es la contaminación térmica? Dicho de manera técnica la contaminación térmica está basada en la descomposición de la calidad del agua y del aire, puede afectar a la calidad de vida por la subida de temperatura o por la bajada de temperatura y afecta de manera negativa a los seres vivos. Si definimos la contaminación térmica de una manera más coloquial podríamos decir que es un proceso que modifica la temperatura del medio amiente de manera perjudicial. El medio más común en el que la contaminación contaminación térmica se manifiesta es en el agua, aunque también en el aire, pero en el aire este tipo de contaminación se dispersa fácilmente aunque también es posible, un ejemplo de eso serían los aparatos de aire acondicionados los cuales echan el calor hacia la calle. Una central térmica precisa de refrigeración porque no transforma toda su energía química en electricidad y lo restante sería calor. Es por ello por lo que el agua es el elemento perfecto para que
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Para reducir el efecto que tiene el tirar agua a altas temperaturas en los ríos o en los mares pasa por una torre de evaporación, esta torre lo que hace es que reduce una gran parte de la temperatura. Pero, aunque se realice este proceso se alteran las características fisicoquímicas que hay en el agua de los mares y los ríos. Aunque en la actualidad tenemos que decir que la salida de agua está controlada ya que en verano por ejemplo las centrales nucleares paran esta salida por la subida de temperatura temperatura y el caudal escaso que presentaban los ríos. Como hemos dicho anteriormente, la contaminación térmica es tanto el descenso como la subida de temperatura, temperatura, es por eso por lo que tenemos que hablar también de la excesiva agua fría. En muchas industrias de regasificación del gas natural se usa una gran cantidad de volumen de agua del mar y se devuelve mucho más fría de lo que estaba antes. Este desgasta de la calidad del agua o del aire ambienta, ya sea porque la temperatura baja o sube afecta de forma negativa a los seres vivos y en general al medio ambiente porque estos cambios climáticos que se producen desajustes el equilibrio medioambiental. Causas de este tipo de contaminación
Un cambio brusco de la temperatura. La energía que liberan las lámparas fluorescentes, focos y lámparas incandescentes, en forma de calor.
El tirar agua caliente en ríos o mares.
El verter agua fría en ríos o mares.
La energía que desprenden los motores de combustión interna a modo de calor.
Entre muchas causas más pero estas serían las principales causas para la aparición de este tipo de contaminación. ¿Cómo afecta al bienestar de los seres vivos?
La extinción de varias especies de animales y plantas.
Lluvias torrenciales, sequias sequias e inundaciones que afectan a todos los seres vivos.
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Reciclar el agua usada en los procesos de enfriamiento. Por ejemplo, esperar a que se enfrié y se vuelve a utilizar. Restringir la cantidad de agua termal que se vierte en el mismo cuerpo del agua.
Este tipo de contaminación contaminación es un problema global y es el principal causante del calentamiento global. El calentamiento global no solo afecta al a los animales y plantas si no que tiene causas muy perjudiciales perjudiciales para la salud de los seres humanos.
Fase 5 Conclusión
Actualmente la contaminación térmica juega un gran papel en el bienestar del medio ambiente. ambiente . Sin embargo, muchas personas dan por hecho que este tipo de contaminación raramente puede dar efectos negativos en su salud o bienestar y eso se da por la falta de conocimiento sobre este tipo de contaminación.