Assumption list and models
Heat transfer model
The prediction is based on state space approach models. Model parameters are tuned with test results.
Main heat transfer characteristic is given by:
k.A
Quality of hardware version is given by:
k.A/G
Both constant within ranges of massflow over viscosity.
Insulation quality
The unit is well insulated so that heat loss over the external surface is less than 0.5% of the internally exchanged heat. In other words: according to the first law of thermodynamics, the energy balance over the hot and cold flow in steady state yields a deviation smaller than 0.5%.
Backpressure model
The main backpressure characteristic is given by:
–cte is only geometry dependent.
–Character of Cold-flow and Hot-flow differ, depending on the connection orientation