HiTRAN^® Thermal System  

     hiTRAN.SP     Design and Selection Program

 Screenshots

1. hiTRAN calculator
2. Data entry forms
3. Result output

1. hiTRAN Calculator

At the heart of the hiTRAN.SP program is the hiTRAN calculator. In general the hiTRAN calculator works similarly in both standalone and interactive mode. In this mode a graphical and a numerical display is generated.

Graphical Display:
In the graphical display the tube side heat transfer coefficient is displayed as a function of pressure drop.

In the chart hiTRAN and the plain tube performance is displayed. Each red square shown in the picture represents one additional pass in a plain tube heat exchanger. In the example displayed below the flow regime changes from laminar to turbulent in this case the pass arrangement increases from 7 to 8 passes. This causes a considerably higher-pressure drop with notable gain in heat transfer.

In contrast, the curves represent the exchanger equipped with hiTRAN Elements. Each curve represents the exchanger design with 1, 2, 3...10 passes. At the Starting point of each curve is a design with the lowest tube Insert packing density, resulting in a relatively low pressure drop and heat transfer gain. The curve ends with a design for the highest turbulator packing density with a high pressure drop and heat transfer gain. By changing the numerical entries (white text fields) the display is changed!

Pic. 1: Screenshot hiTRAN Calculator, graphical and numerical display (standalone mode)
 

Numerical Display:
In the numerical display it is possible to change the bundle geometry in order to meet the pressure drop requirements. The layout of this section depends on the mode the user uses for their calculations. The layout for the standalone mode can be seen in picture 1.

If the user works in interactive mode for air cooler design (pic 2), more detailed changes with respect to the bundle geometry are possible (only possible when ACOL or HTRI Xchanger suite is installed). In this mode the face velocity can also be altered and transferred to ACOL or Xist in order to calculate the overall air cooler performance.

In both modes, standalone and interactive, the tubeside film coefficient and the pressure drop is calculated.  In the screenshot below it can be observed that the tube side coefficient is about 6 times higher for the same pressure drop as in the case of the plain tube.  Additionally a recommendation panel is displayed to guide the user through the design process.

Pic. 2: Screenshot hiTRAN Calculator, numerical display (Interactive mode)

1. hiTRAN calculator
2. Data entry forms
3. Result output

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