Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
DYNAMIC IDENTIFICATION OF A BEVERAGE COOLER SYSTEM WITH PREDICTION OF TEMPERATURE STABILIZATION TIME FOR ENERGY SAVING
Submission Author:
João Charles dos Santos , RS
Co-Authors:
João Charles dos Santos, Guilherme Holsbach Costa, Carlos Roberto Altafini, Diorge Alex Bao Zambra
Presenter: João Charles dos Santos
doi://10.26678/ABCM.ENCIT2022.CIT22-0667
Abstract
This paper investigates the reduction of energy consumption in beverage coolers by shutting it down outside the shift hours. In this context, it is important to know the appropriate time instant for turning on the compressor, ensuring to achieve the steady-state temperature right before the next work shift. Therefore, a system identification method is proposed to predict this time instant, using Newton's law of cooling. An experimental investigation was conducted considering a commercial model of beverage cooler under two levels of thermal load variation, loaded with 32 and 64 liters, and with the thermostat adjusted for two distinct levels temperature, moderate cold and maximum cold. The results demonstrated a maximum error of 2.7% in predicting the time to turn on the compressor. The proposed method achieved an electrical energy saving of 5.6% with the refrigerator operating with maximum load and in the maximum cold configuration. However, the method provided 26% of energy savings with maximum load and with the thermostat set to moderate cold. The results were satisfactory, showing the feasibility of the proposed model. There was an effective reduction in energy consumption of beverage cooler without loss of cold sensation at the time of product consumption.
Keywords
Refrigeration, systems modeling, energy savings
