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An industrial gas (c = 1 kJ/kgK) enters a parallel flow heat exchange at 250°C with a flow rate of 2 kg/s to heat a water stream. The water stream (c = 4 kJ/kgK) enters the heat exchange at 50°C with a flow rate of 1 kg/s. The heat exchange has an effectiveness of 0.75. The gas stream exit temperature will be
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- 75°C
- 100°C
- 125°C
- 150°C
Correct Option: B
| ε = | Cmin(Thi - Tci) |
| 0.75 = | 2 ×(250 - 50) |
Th2 = 100° C
