A single-effect evaporator concentrates orange juice so product solids concentration/feed solids concentration=2.7. Feed is 100 kg/h at 30°C, and evaporation is at 60°C. Juice specific heat is 3.9 kJ/(kg·°C) and latent heat at 60°C is 2450 kJ/kg. Find the nearest total heat requirement in MJ/h.
Conserve solids:$Fx_f=Px_p$,and $x_p=2.7x_f$,so product flow $P=100/2.7=37.037$ kg/h. Water evaporated is $V=100-P=62.963$ kg/h. Sensible duty is $100(3.9)(60-30)=11700$ kJ/h, and latent duty is $62.963(2450)=154259.26$ kJ/h. Total is 165959.26 kJ/h=**165.96 MJ/h, A**.
More Evaporation and Drying questions
GATE 2026 AG Q46– At 60°C dry-bulb temperature, saturated water-vapor pressure is 20 kPa and relative…
GATE 2025 AG Q32– Apple slices dry in the falling-rate period from 65% to 10% dry-basis moisture.…
GATE 2024 AG Q24– Which mechanisms explain the falling-rate drying period? Select all that apply.
GATE 2024 AG Q35– A single-effect evaporator concentrates9090 kg/hour herbal extract from 12% to 20% solids.…
GATE 2024 AG Q63– Mango pulp initially 25°C and 70% wet-basis moisture is dried to 10% wet basis using95°C…
GATE 2023 AG Q33– A fluidized carrot bed has minimum-fluidization height 1.20 m, diameter .60 m, carrot…