Tempco has created a clear, concise tutorial to simplify the selection of data needed to size heat exchangers. When performing thermal calculations for heat exchangers, it is not necessary to provide every data point listed in the document for completeness – only a specific subset is required.
In fact, as indicated in the documentation, just five of the listed data are necessary and sufficient: the ‘must-have’ data – essential for initiating the sizing process- are those required for the thermal calculation:
- Primary fluid inlet and outlet temperatures
- Primary fluid flow rate
- Secondary fluid inlet and outlet temperatures
- Secondary fluid flow rate
- Fluid pressure (crucial in the case of gases)
Capacity is another important factor for the thermal sizing of the exchanger; however, if the other five data are available, capacity can be calculated from them.
The other data listed under the heading “DATA FOR HEAT EXCHANGERS DESIGN AND CONSTRUCTION” are useful for a more precise and comprehensive design but are not essential for an initial thermal calculation:
- Fluid types
- Max. operating temperature
- Max. operating pressure
- Oversizing % (margin)
- Allowable pressure drops (primary and secondary)
- Fluid viscosity
- Fluid specific weight
- Heat transfer coefficient
- Fouling factor
In summary, to begin the sizing process, it is essential to provide at least five of the listed thermal parameters – including pressure if a gas is involved. The remaining data help refine the unit’s design specifications but are not required at the initial stage. It is important to note that for special fluids, you must contact Tempco directly, as specified in the document.
FIVE FINGERS RULE
