Homework Question 8:

4.74 Figure P4.74 provides steady-state operating data for a cogeneration system with water

vapor at 20 bar, 360°C entering at location 1. Power is developed by the system at a rate of 2.2

MW. Process steam leaves at location 2, and hot water for other process uses leaves at location

3. Evaluate the rate of heat transfer, in MW, between the system and its surroundings. Let g =

9.81 m/s².

m₁ = 1.5 kg/s

P₁ = 20 bar

T₁ = 360°C

V₁ = 50 m/s

Saturated vapor

P₂ = 1 bar

V₂ = 100 m/s

m₂ = m₂

10 m

FIGURE P 4-74

2.2 MW

Saturated liquid

P3= 1 bar

V3 = 100 m/s