Project ForgeSign up free
Heat Transfer
Heat Exchangers
GATE 2011
Medium

An aqueous sodium chloride solution (10 wt%) is fed into a single effect evaporator at 10000 kg/hr and concentrated to 20 wt%. Steam consumption is 8000 kg/hr. The evaporator capacity (kg/hr) and economy are

  • 5000, 0.625
  • B10000, 0.625
  • C5000, 1.6
  • D10000, 1.6

Explanation

Solute balance: 10000×0.10=L×0.20 ⟹ L=5000 kg/hr (thick liquor). Capacity (water evaporated)=10000−5000=5000 kg/hr. Economy=Vaporized/Steam=5000/8000=0.625.

Source: GATE CH 2011 (2011)

This question is part of a 15-day revision cycle — sign in and Project Forge will bring it back the day before you'd forget it.

Start revising free