Guía 5.pdf - Guía 5 Termodinámica y Transferencia de...

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Guía 5 Termodinámica y Transferencia de calor 1. Un motor de automóvil consume combustible a razón de 22 L/h y entrega a las ruedas una potencia de 55 kW. Si el combustible tiene un poder calorífico de 44,000 kJ/kg y una densidad de 0.8 g/cm 3 , determine la eficiencia del motor. 2. Una planta eléctrica de carbón produce una potencia neta de 300 MW con una eficiencia térmica total de 32 %. La relación real gravimétrica aire-combustible en el horno se calcula que es 12 kg aire/kg de combustible. El poder calorífico del carbón es 28,000 kJ/kg. Determine a) la cantidad de carbón que se consume durante un periodo de 24 horas y b) la tasa de aire que fluye a través del horno. 3. Un refrigerador doméstico que tiene una entrada de potencia de 450 W y un COP de 2.5 debe enfriar cuatro sandías grandes, de 10 kg cada una, a 8 °C. Si las sandías están
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  • Fall '19
  • Combustible, Transferência de Calor, Máquina térmica

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