14.25.2.5 kg/s of a solution at 288 K containing 10 per cent of dissolved solids is fed to a forward-feed double-effect evaporator, operating at 14 kN/m² in the last effect. If the product is to consist of a liquid containing 50 per cent by mass of dissolved solids and dry saturated steam is fed to the steam coils, what PROBLEMS 1179 should be the pressure of the steam? The surface in each effect is 50 m² and the coefficients for heat transfer in the first and second effects are 2.8 and 1.7 kW/ m² K, respectively. It may be assumed that the concentrated solution exhibits a boiling-point rise of 5 deg K, that the latent heat has a constant value of 2260 kJ/kg and that the specific heat capacity of the liquid stream is constant at 3.75 kJ/kg K O

Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter3: Refrigeration And Refrigerants
Section: Chapter Questions
Problem 31RQ: Define a near-azeotropic refrigerant blend, and give twoexamples.
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14.25.2.5 kg/s of a solution at 288 K
containing 10 per cent of dissolved solids
is fed to a forward-feed double-effect
evaporator, operating at 14 kN/m² in the
last effect. If the product is to consist of
a liquid containing 50 per cent by mass of
dissolved solids and dry saturated steam
is fed to the steam coils, what
PROBLEMS
1179
should be the pressure of the steam? The
surface in each effect is 50 m² and the
coefficients for heat transfer in the first
and second effects are 2.8 and 1.7 kW/
m² K, respectively. It may be assumed
that the concentrated solution exhibits a
boiling-point rise of 5 deg K, that the latent
heat has a constant value of 2260 kJ/kg
and that the specific heat capacity of the
liquid stream is constant at 3.75 kJ/kg K
O
Transcribed Image Text:14.25.2.5 kg/s of a solution at 288 K containing 10 per cent of dissolved solids is fed to a forward-feed double-effect evaporator, operating at 14 kN/m² in the last effect. If the product is to consist of a liquid containing 50 per cent by mass of dissolved solids and dry saturated steam is fed to the steam coils, what PROBLEMS 1179 should be the pressure of the steam? The surface in each effect is 50 m² and the coefficients for heat transfer in the first and second effects are 2.8 and 1.7 kW/ m² K, respectively. It may be assumed that the concentrated solution exhibits a boiling-point rise of 5 deg K, that the latent heat has a constant value of 2260 kJ/kg and that the specific heat capacity of the liquid stream is constant at 3.75 kJ/kg K O
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