Fluid Identification and Properties

A fluid is identified by a search of the input storage. For example, if there is a zero in the flow input for water, the computer knows that it is some other substance. Thus, in effect, it answers the question, Ts it water  

There are three sources from which this routine can assemble properties. They are (1) through input data, (2) by calculation and (3) within the subroutine. 

Properties which require for calculation more memory capacity than the computer has available included in the input after they are calculated an example of this is liquid viscosity. Properties constant over a wide temperature range are stored within the subroutine. The specific heat of water is an example. 

This equation is based on a characterization factor of 11.8. If the oil has a significantly different factor, a multiplier must be used with equation 1. The multiplier can be obtained from the expression 0.055i + 0.35, where K is the characterization factor. 

Tube Pitch (1) 15/16, (2) 1, (3) 1-V4, or (4) 1-Va Overall fouling Shell Design Pressure, psi Corrosion Allowance, in. 

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The first computer step after loading the input is to identify the fluids on the shell and tube sides. A block diagram of the fluid identification and properties subroutine is given in Figure 2-49. After identification, the properties are assembled and transferred to where they will be used in the program. To save valuable memory space this same routine is used for both the shell and tube sides. 

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