GUIA FASE 3 TERMODINAMICA (1).docx - ACTIVIDADES UNIDAD 1 FASE 3 DESARROLLAR Y PRESENTAR PRIMERA FASE SITUACIÓN PROBLEMA Cada estudiante deber� de

GUIA FASE 3 TERMODINAMICA (1).docx - ACTIVIDADES UNIDAD 1...

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ACTIVIDADES UNIDAD 1: FASE 3 - DESARROLLAR Y PRESENTAR PRIMERA FASE SITUACIÓN PROBLEMA Cada estudiante deberá, de forma individual, presentar el desarrollo de los siguientes ejercicios. 1. Realice las siguientes conversiones de unidades: a. Convertir 7500BTU/lb a kJ/kg 7500 BTU Lb 1,05506 KJ 1 BTU 1 Lb 0,4535 Kg 7500 BTU Lb 1,05506 KJ 1 BTU 1 Lb 0,4535 Kg 17.448,62 KJ Kg b. Convertir una cantidad de calor igual a 1110 BTU/h a W . 1110 BTU H 0,2931 W 1 BTU H 1110 BTU H 0,2931 W . H 1 BTU 325,341 W c. Convertir un flujo igual a 53 galones/min a m 3 /h.
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X m 3 1 h 264,172 galones 1 m 3 1 h 60 min = 53 galones minutos X 264,172 galones = 53 galones 60 minutos minutos X = 3.180 264,172 X = 12 m 3 hora d. Convertir un flujo de energía igual a 24 kcal/min a J/s X J S 1 cal 4,1868 J 60 Seg min = 24.000 cal min X 14,33 = 24.000 X = J S 2. Una turbina de gas adiabática expande aire a 1 000 kPa y 500°C hasta 100 kPa y 150°C. A la turbina entra aire por una abertura de 0.2 m 2 , con una velocidad promedio de 40 m/s, y sale por una abertura de 1m 2 . Determine: 2.1. El flujo de masa de aire que atraviesa a turbina 2.2. La potencia que produce la turbina. DATOS DEL PROBLEMA P 1 = 1000 KPa T 1 = 500 ° c P 2 = 100 KPa T 2 = 150 ° C A 1 = 0,2 M 2 V 1 = 40 m sg
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A 2 = 1 m 2 Se requiere el flujo masico que opera en la turbina, realizando el volumen de control, y sabiendo que el teorema de conservación de masa establece que: m 1 = m 2 Entonces m 1 = m 2 = pQ La densidad p de aire se calcula con la ecuación de gases ideales. PV = mRt PV = m V RT m V = ρ p = ρRT ρ = P RT R = 0,082 KJ Kg° K T = 273 + 500 = 773 ° K P = 1000 kpa ρ = 1000 kpa 0,082 KJ Kg° K 773 ° K = 15,77 Kg m 3 SECALCULA ELCAUDAL Q = VA Q = 40 m s 0,2 m 2 Q = 8 m 2 s entonces
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m = 15,77 kg m 3 8 m 3 seg m = 126,16 kg seg Paraobtenerla potenciase debe saber el trabajo.
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  • Spring '17
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