Identification of the effective heat capacity-temperature relationship and the phase change hysteresis in PCMs by means of an inverse heat transfer problem solved with metaheuristic methods

2021 ◽  
pp. 117392
Author(s):  
Martin Zálešák ◽  
Pavel Charvát ◽  
Lubomír Klimeš
Keyword(s):  
Heat Transfer ◽  
Heat Capacity ◽  
Phase Change ◽  
Transfer Problem ◽  
Heat Transfer Problem ◽  
Temperature Relationship ◽  
Effective Heat Capacity ◽  
Inverse Heat Transfer ◽  
Inverse Heat Transfer Problem ◽  
Metaheuristic Methods

scholarly journals Inverse heat transfer problem in digital temperature control in plate fin and tube heat exchangers

2011 ◽  
Vol 32 (4) ◽  
pp. 17-32 ◽  
Author(s):  
Dawid Taler ◽  
Adam Sury
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Temperature Control ◽  
Heat Exchangers ◽  
Pid Controller ◽  
Transfer Problem ◽  
Heat Transfer Problem ◽  
Inverse Heat Transfer ◽  
Inverse Heat Transfer Problem ◽  
Exit Temperature

Inverse heat transfer problem in digital temperature control in plate fin and tube heat exchangersThe aim of the paper is a steady-state inverse heat transfer problem for plate-fin and tube heat exchangers. The objective of the process control is to adjust the number of fan revolutions per minute so that the water temperature at the heat exchanger outlet is equal to a preset value. Two control techniques were developed. The first is based on the presented mathematical model of the heat exchanger while the second is a digital proportional-integral-derivative (PID) control. The first procedure is very stable. The digital PID controller becomes unstable if the water volumetric flow rate changes significantly. The developed techniques were implemented in digital control system of the water exit temperature in a plate fin and tube heat exchanger. The measured exit temperature of the water was very close to the set value of the temperature if the first method was used. The experiments showed that the PID controller works also well but becomes frequently unstable.

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