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1. (WO2018200706) DYNAMIC COEFFICIENT OF PERFORMANCE CALCULATION FOR REFRIGERATION SYSTEMS

Pub. No.:    WO/2018/200706    International Application No.:    PCT/US2018/029414
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Thu Apr 26 01:59:59 CEST 2018
IPC: F25B 49/02
G01M 99/00
F24F 11/30
F25B 9/14
Applicants: EMERSON CLIMATE TECHNOLOGIES RETAIL SOLUTIONS, INC.
Inventors: SAUNDERS, Michael A.
RAJENDRAN, Rajan
WALLACE, John
Title: DYNAMIC COEFFICIENT OF PERFORMANCE CALCULATION FOR REFRIGERATION SYSTEMS
Abstract:
Systems and methods for performing dynamic coefficient of performance calculations for refrigeration systems are provided. A controller calculates a weighted Carnot efficiency of a refrigeration case based on outdoor temperature data, refrigeration case temperature data, a case load of a refrigeration case, and a case defrost status of the refrigeration case. The controller calculates a weighted coefficient of performance based on based on a refrigerant type, the case load of the refrigeration case, the case defrost status of the refrigeration case, and at least one of the of the refrigeration case temperature data and pressure data. The controller calculates a system performance index (SPI) for the refrigeration case based on the weighted Carnot efficiency of the refrigeration case and weighted actual Carnot efficiency. The controller generates, in response to the SPI being below a threshold, an output indicating that the refrigeration case is operating below a threshold efficiency.