ε-NTU method is used when:
1. Outlet temperatures are unknown (or can not be calculated using energy balance equations)
2. Size (surface area of HX) and type of HX is known
3. Mass flow rates of hot and cold fluids are known
ε-NTU method is used when:
1. Outlet temperatures are unknown (or can not be calculated using energy balance equations)
2. Size (surface area of HX) and type of HX is known
3. Mass flow rates of hot and cold fluids are known