Heater: Equipment Tab

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Variable Definitions, Ranges and Default Values

The following table shows the meaning of the variables appearing in this tab, as well as their default values and their generally acceptable range. Note that due to the manner by which the variables are used by the sizing and costing equations, the range of acceptable values may be further reduced.

Variable

Default Value

Range

 

◙ Heat Transfer Area
The total heat transfer area.

0.0 m2 

Positive

◙ Max Heat Transfer Area
The maximum heat transfer area that a unit of this type is available for purchase in the market.

100.0 m2 

Positive

○ Exchanger Type
The type of exchanger can affect the costing of the heater.

Plate & Frame

Plate & Frame /

Spiral /

Shell & Tube

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Sizing: Design Mode

In Calculate (Design Mode), the user specifies the Maximum Heat Transfer Area and the system computes the Number of Units and the Heat Transfer Area. See also Heating: Modeling Calculations.

Sizing: Rating Mode

In User-Defined (Rating Mode), the user specifies the Number of Units and the Heat Transfer Area.

Costing

Built-in equipment purchase cost functions are available for three different types of heat exchangers: plate-and-frame, spiral, and shell-and-tube. The cost is based on the total heat transfer area and the material of construction which is assumed to be CS.

For more information on this equipment, see:

●      Heater

●      Cooler

●      Heat Exchanger

For information on the left-hand side variables and options, see Equipment Data Dialog: Equipment tab.