Title :
Power consumption in refrigeration systems - Modeling for optimization
Author :
Hovgaard, Tobias Gybel ; Larsen, Lars F S ; Skovrup, Morten J. ; Jørgensen, John Bagterp
Author_Institution :
Danfoss A/S, Nordborg, Denmark
Abstract :
Refrigeration systems consume a substantial amount of energy. Taking for instance supermarket refrigeration systems as an example they can account for up to 50-80% of the total energy consumption in the supermarket. Due to the thermal capacity made up by the refrigerated goods in the system there is a possibility for optimizing the power consumption by utilizing load shifting strategies. This paper describes the dynamics and the modeling of a vapor compression refrigeration system needed for sufficiently realistic estimation of the power consumption and its minimization. This leads to a non-convex function with possibly multiple extrema. Such a function can not directly be optimized by standard methods and a qualitative analysis of the system´s constraints is presented. The description of power consumption contains nonlinear terms which are approximated by linear functions in the control variables and the error by doing so is investigated. Finally a minimization procedure for the presented problem is suggested.
Keywords :
optimisation; power consumption; refrigeration; specific heat; energy consumption; load shifting; minimization; nonconvex function; optimization; power consumption; refrigerated goods; supermarket refrigeration systems; thermal capacity; vapor compression refrigeration system; Heating; Minimization; Power demand; Refrigerants; Valves;
Conference_Titel :
Advanced Control of Industrial Processes (ADCONIP), 2011 International Symposium on
Conference_Location :
Hangzhou
Print_ISBN :
978-1-4244-7460-8
Electronic_ISBN :
978-988-17255-0-9