Week 5 Challenge

Week 5 challenge – Heat exchangers:

1. Determine the cooling water required to completely condense 1500kg/hr of vapor at 3barg pressure and saturated condition with the following composition. Cooling water inlet temperature shall be considered as 35°C and can be allowed to heat upto 45°C
2. Propane – 0.2 mol %
3. N-butane – 0.4 mol%
4. N-pentane – 0.4 mol %

Answer:

The cooling water required to completely condense 1500kg/hr of vapor at 3barg pressure is 8374 kg/hr

2. Determine the saturated steam pressure required to vaporize the saturated liquid stream with following composition and operating pressure of 4 barg

N-butane – 0.5 mol %

N-pentane – 0.5 mol%

Answer:

The saturated steam pressure required to vaporize the saturated liquid stream is 1898 kPa

3. Determine the steam flow rate (saturated steam @ 4barg pressure) required to completely vaporize the stream with following conditions

Composition

Propane – 0.3 mass %

N-butane – 0.4 mass %

N-pentane – 0.3 mass %

Operating pressure – 3 barg

Operating temperature – 90°F

Answer:

The steam flow rate required to completely vaporize the stream is 57800 kg/hr