Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Differenced of true temperature difference and the LMTD
Ratio of LMTD to the true temperature difference
Ratio of true temperature difference to the LMTD
Geometric mean of the true temperature difference and the LMTD

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Process Equipment and Plant Design
In a vertical short tube evaporator (Calendria type), the

Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used
Liquor is inside the tube while the steam is outside the tube
Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
All of these

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