Table of Contents
What is Hetp in packed column?
The height of an equivalent equilibrium stage, usually called the height of a theoretical plate (HETP), is the height of packing that will give the same separation as an equilibrium stage.
What is NTU effectiveness?
NTU is a measure of the effectiveness of the heat exchanger. The NTU is a measure of the heat transfer size of the exchanger; larger the value of NTU, the closer the heat exchanger approaches its thermodynamic limit. N T U = U A C m i n. Cmin is the minimum heat capacity between the hot and cold fluid.
What is U in NTU method?
NTU is defined as:[11.74]NTU=UACminwhere U is the overall heat transfer coefficient (kW/m2K), A is the heat transfer area of the heat exchanger (m2) and Cmin is the smallest thermal capacity of the two fluids (kW/K).
What is Hetp in mass transfer?
The characteristic value to describe mass transfer phenomena in an equilibrium basedon model is the height equivalent to a theoretical plate (HETP). HETP values are received from distillation experiments and differ with liquid and gas load expressed by the F-factor with gas velocity and density (Eq. (1)).
What is operating line in mass transfer?
Operating lines define the mass balance relationships between the liquid and vapour phases in the column. There is one operating line for the bottom (stripping) section of the column, and on for the top (rectification or enriching) section of the column.
What is HTU in mass transfer?
The height of a transfer unit (HTU) is a measure of the separation effectiveness of the particular packings for a particular separation process. As such, it incorporates the mass transfer coefficient that we have seen earlier. and KY is the overall gas-phase mass transfer coefficient.
What do Pall rings do?
Pall Rings are often used in absorption and distillation services. High Performance Saddle-Ring – Saddle Ring Packing may replace Pall Rings to deliver better efficiency and capacity in the same bed height and diameter. They can increase efficiency by 25\% or capacity by 15\%.
What is the basis of different mass transfer coefficient?
The mass transfer coefficients depend on the diffusivity of the solute and the hydrodynamics of the phases. They can be calculated using expressions derived from fundamentals of mass transfer, in the case of laminar flow, or from empirical correlations.