Patent ID: 9170628
Filing Date: 2015-10-27
Classification: F25B,F25D,G06F

Abstract:
1. An energy-savings control system for showcases, refrigerators and freezers in which the showcase, refrigerator and freezer may be defrosted at predetermined particular time intervals while they are running during the twenty-four hours every day; an electromagnetic valve mounted in each respective one of the showcase, refrigerator and freezer may be controlled to be switched to its closed position; and a freezing-machine installed in each respective one of the showcase, refrigerator and freezer may be controlled so that a coolant liquid can be delivered through its coolant delivery pipe to each respective one of the showcase, refrigerator and freezer during the defrosting process, wherein the energy-savings control system comprises: a first temperature detecting means for detecting the temperature inside each respective one of the showcase, refrigerator and freezer; an average electric current value computing means for detecting, at a time interval of every one minute, the electric current values flowing through said freezing-machine installed in each respective one of said showcase, refrigerator and freezer and computing the average electric current values for the continuous thirty minutes from the individual electric current values as detected; a freezing-machine's operating rate computing means for computing the freezing-machine's operating rate by dividing the average electric current values obtained by said average electric current value computing means by the particular rated electric current values for said freezing-machine for which said average electric current values have been provided; a freezing-machine's operating rate determining means for comparing the values for the freezing-machine's operating rate obtained by said freezing-machine's operating rate computing means with the values for the freezing-machine's operating rata that has been predetermined for each of the four different seasons and for every running time zone for the freezing-machine for which the average electric current values have been provided and determining whether the values for the former operating rate are smaller or greater than the values for the latter operating rate; a temperature determining means for determining, as the result of the comparison and determination provided by the freezing-machine's operating rate determining means, whether the temperatures in each respective one of the showcase, refrigerator and freezer in which the corresponding freezing-machine for which the average electric current values have been provided is installed and that have been detected by the first temperature detecting means when it is determined that the values for the freezing-machine's operating rate provided by the freezing-machine's operating rate computing means are greater than the values that are predetermined for the freezing-machine's operating rate by a certain value are within the predetermined temperature range or not; and an electromagnetic valve control means for controlling an electromagnetic valve mounted in each respective one of the showcase, refrigerator and freezer in which the corresponding freezing-machine for which the average electric current values have been provided is installed so that each respective electromagnetic valve can be switched to its opened position in order to allow a coolant liquid to be delivered through its delivery pipe from the freezing-machine to each respective one of the showcase, refrigerator and freezer when it is determined that the temperature inside each respective one of the showcase, refrigerator and freezer is not within the predetermined particular temperature range as the result of the determination made by the temperature determining means.