This paper presents the effect of door openings of refrigerators/freezers on the energy consumption and
compartment temperature variation by experimental approach. Two types of refrigerators/freezers were
tested in the study. One is a type of variable frequency operation, while the other is a type of fixed frequency
operation. The testing procedure was conducted under the ambient temperatures of 15 and 30 C, and the
door opening operation was carried out by one automatic robotic apparatus in an environmental control
room. From the test results, energy consumption of refrigerators/freezers with door opening was found to
increase by 10%, compared to the same product without door opening. Based on the compartment temperature
variation status during door opening, control strategy was also proposed to improve the efficiency
of variable frequency type of refrigerators/freezers. Future study on door opening control methodology can
be addressed on usages characteristics, so that it would help to control temperature variation and improve
energy utilization by minimizing the effect of door opening.
This paper presents the effect of door openings of refrigerators/freezers on the energy consumption andcompartment temperature variation by experimental approach. Two types of refrigerators/freezers weretested in the study. One is a type of variable frequency operation, while the other is a type of fixed frequencyoperation. The testing procedure was conducted under the ambient temperatures of 15 and 30 C, and thedoor opening operation was carried out by one automatic robotic apparatus in an environmental controlroom. From the test results, energy consumption of refrigerators/freezers with door opening was found toincrease by 10%, compared to the same product without door opening. Based on the compartment temperaturevariation status during door opening, control strategy was also proposed to improve the efficiencyof variable frequency type of refrigerators/freezers. Future study on door opening control methodology canbe addressed on usages characteristics, so that it would help to control temperature variation and improveenergy utilization by minimizing the effect of door opening.
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