-
In a counter flow heat exchange, for the hot fluid the heat capacity = 2 kJ/kgK, mass flow rate = 5 kg/s, inlet temperature = 150°C, outlet temperature = 100°C. For the cold fluid, heat capacity = 4 kJ/kg K, mass flow rate = 10 kg/s, inlet temperature = 20°C. Neglecting heat transfer to the surroundings, the outlet temperature of the cold fluid in °C is
-
- 7.5
- 32.5
- 45.5
- 70.0
Correct Option: B
Heat lost by fluid = Heat gained by cold fluid
5 × 2000 × 150 – 100) = 10 × 4000 (Tco – Tci)
∴ Tco = 32.5°c
