US 12,276,991 B2
Double pipe heat exchanger fouling compensation
Sami El Ferik, Dhahran (SA); Mustafa Al-Nasser, Al-Khobar (SA); Rached Ben Mansour, Dhahran (SA); and Mohammed Ahmed Mohammed Eltoum, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA); and Yokogawa Saudi Arabia Company, Al-Khobar (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Dec. 14, 2021, as Appl. No. 17/550,444.
Claims priority of provisional application 63/125,064, filed on Dec. 14, 2020.
Prior Publication US 2022/0187858 A1, Jun. 16, 2022
Int. Cl. F28D 7/00 (2006.01); G05B 15/02 (2006.01); G05D 23/19 (2006.01); G06F 17/11 (2006.01); G06F 119/08 (2020.01); G06N 7/02 (2006.01)
CPC G05D 23/1917 (2013.01) [G05B 15/02 (2013.01); F28D 7/0008 (2013.01); G06F 17/11 (2013.01); G06F 2119/08 (2020.01); G06N 7/023 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of controlling a counter flow double pipe heat exchanger (DPHE) that includes a hot fluid pipe and a cold fluid pipe, the method comprising:
determining a temperature error between a reference temperature and a temperature at an outlet of the hot fluid pipe of the counter flow DPHE;
determining a cold fluid mass flow rate from an output of a proportional-integral-derivative (PID) controller based on the temperature error being input to the PID controller, the cold fluid mass flow rate being used for a cold fluid in the cold fluid pipe of the counter flow DPHE; and
controlling the temperature at the outlet of the hot fluid pipe of the counter flow DPHE to maintain the temperature error within a predefined range by utilizing parameters of the PID controller that are set by using a harmony search algorithm (HSA) to obtain a minimization of a cost function.