Double Pipe Heat Exchanger Design

Double Pipe Heat Exchanger Design

This article shows how to do design for Double Pipe Heat Exchanger and estimate length of double pipe required. Determine Heat Load Obtain flowrate (W ), inlet, outlet temperatures and fouling factor for both hot and cold stream. Calculate physical properties like density (ρ), viscosity (μ), specific heat (Cp) and thermal conductivity (k) at mean …

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Flash Calculation (Raoult’s Law)

Flash Calculation (Raoult’s Law)

This article shows step by step procedure to do Bubble Point, Dew Point and Flash Calculation based on Raoult’s Law. Bubble Point Calculation Bubble point of a system is the temperature at which liquid mixture begins to vaporize. Obtain process parameters Get liquid mixture molar composition ( Xi ) and Pressure (P) of the system. …

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Heat Exchanger Analysis

Heat Exchanger Analysis

Heat Exchanger Analysis based on Effectiveness (ε) – NTU method is done when inlet temperatures are known and outlet temperatures are to be determined. Obtain Process Parameters Get process stream mass flowrate (M), specific heat (Cp) and inlet temperature (T). Obtain the heat transfer area (A) and overall heat transfer coefficient (U) for the given …

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PT Flash Calculation using PR EOS

PT Flash Calculation using PR EOS

PT Flash calculation determines split of feed mixture F with a molar composition Zi, into Vapor V and Liquid L at pressure P and temperature T. These calculations can be done in a excel spreadsheet using Peng Robinson Equation of State (PR EOS). To start with bubble point pressure (PBubble) and dew point pressure (PDew) …

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Estimating Binary Interaction Parameter by Regression

Estimating Binary Interaction Parameter by Regression

Wilson equation is commonly used to predict non ideality in binary mixture vapor liquid equilibrium. This article shows how to estimate binary interaction parameters used in wilson equation from experimental data by regression in excel spreadsheet. Example Determine binary interaction parameters used in wilson equation for a mixture of acetone and chloroform from T x-y …

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Heat Loss from Insulated Pipe

Heat Loss from Insulated Pipe

Heat loss/gain takes place from a pipe carrying hotter/ colder fluid than ambient temperature. Insulation reduces the heat loss to surroundings. Heat loss depends upon number of factors like insulation thickness, ambient temperature, wind speed etc. This article shows how to calculate heat loss from an insulated pipe and a bare pipe to surroundings. Example …

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Pipe Network Analysis

Pipe Network Analysis

Pipe Network Analysis determine the flow rates and pressure drops in the individual sections of a hydraulic network. Hardy Cross Method is the oldest and probably best known solution method for pipe networks. In this method, each loop correction is determined independently of other loops. Epp and Fowler (1970) developed a more efficient approach by …

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Binary Batch Distillation

Binary Batch Distillation

Batch distillation is widely used in chemical processing industries when high value added, low volume chemicals must be separated. This article shows how to model and solve a multi-stage binary batch distillation problem in excel. Example The 50 mol feed comprising 70% mols of A and 30% mols of B is to be distilled in …

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Linear Programming in Excel

Linear Programming in Excel

Linear Programming is a widely used mathematical technique designed to help managers and engineers in planning and decision making relative to resource allocation. Linear programming (LP) model essentially consists of 3 components. Decision Variables Objective function Constraints This article shows how to develop LP model in Excel. Example Multipurpose plant is used to manufacture three …

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Sizing Expansion Tank for Hot Oil System

Sizing Expansion Tank for Hot Oil System

Expansion tank is provided in hot oil system to accommodate for the increased thermic fluid volume due to thermal expansion. It also helps in removal of moisture and non-condensables during start-up. This article will show how to do sizing of an expansion tank. Example Size an horizontal expansion tank for hot oil system using Therminol …

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