A simple energy balance program

The datum temperature in the program is 25°C (298 K), which is the standard for most heat of reaction data. Specific heats are represented by a cubic equation in temperature  

If the process involves a reaction the heat generated or consumed is computed from the heat of reaction per kmol of product (at 25°C) and the kmols of product formed. 

If any component undergoes a phase change in the unit the heat required is computed from the latent heat (at 25°C) and the quantity involved. 

The component specific heat capacity coefficients A, B, C, D are stored as a matrix. If a heat balance is to be made on several units the coefficients for all the components can be typed in at the start, and the program rerun for each unit. 

The program listing contains sufficient remark statement for the operation of the program to be easily followed. It is written in GW-BASIC for IBM compatible personal 

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Table 3.2. ENERGY 1, a simple energy balance program...

For the coarse estimation of extruder size and screw speed, simple mass and energy balances based on a fixed output rate can be used. For the more detailed design of a twin-screw extruder configuration it is necessary to combine implicit experience knowledge with simulation techniques. Theses simulation techniques cover a broad range from specialized programs based on very simple models up to detailed Computational Fluid Dynamics (CFD) driven by Finite Element Analysis (FEA) or Boundary Element Method (BEM). 

The energy balance approach to fluid flow problems is developed before the momentum balancejis introduced. This leads to a very simple and logical development of Bernoulli s equation and an intuitively satisfying treatment of fluid friction. In the undergraduate program at the University of Utah, the... 

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