Development of Energy Optimal Capacity Control in Refrigeration Systems

Abstract

As a result of the introduction of variable speed compressors, variable speed fans, and variable speed pumps in a refrigeration system the degree of freedom ofthe overall control system increases -making energy optimisation by intelligent system control feasible.As a consequence of these new possibilities the ideal control method of a refrigeration system changes from being a number of independent single-input single-output controllers (SISO) to a multiple-input multiple-output system (MIMO).Furthermore, combining energy optimal capacity control with intelligent fault detection and diagnostics to ensure high performance increases the potential for reduction of running costs.The above mentioned possibilities are illustrated/investigated by evaluation of the results from the usc of a relatively simple system simulation model.