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
Fig: 1