그린 IT 기술 적용을 통한 CO2 절감 및 효과적인 냉동·공조 정보시스템 개발

Abstract

The objective of this experiment is to compare and analyze the emission of CO2 gas by comparing power consumption of the general compressor and BLDC compressor for the refrigeration when they have been operated. The method of comparing and analyzing is as followed : a general compressor and BLDC compressor of the same system was installed in the same piping and the power for the general compressor, BLDC compressor, evaporator fan motor, solenoid valve, among others were provided through a relay board which can be controlled. Computer communication was used to insert data from the temperature sensor, pressure sensor, voltage, current, etc, provide data to the computer and print data from the computer through a main board which can control such functions and a main board which can control the BLDC control board was also used. Due to the fact that control and data collection is possible, the device was composed of a structure which makes the maximum collection and storage of data and control of devices according to the conditions possible to conduct the experiment. Generally, refrigerating devices use the cooling effect of the evaporator used according to certain purposes and when the temperature set has been reached, the general compressor will stop operation and then restart in accordance with the difference of temperatures. However, the BLDC compressor will operate with the maximum RPM until it reaches the temperature set and then it will be switched to a lower RPM and the RPM will be controlled according to the temperature set. The general compressor will be operated until the temperature set and will stop after achieving the goal of lowering the temperature and it will restart when the temperature begins to rise again after a certain period of time and then the starting condenser and operation condenser will be started as in the beginning stage of operation. At this moment, the starting condenser and operation condenser interact and after it has been started, the operation condenser will work independently and the compressor will be operated. However, the results of the experiment shows that a large amount of power is needed because the starting condenser which consumes a large amount of power in the beginning stages of operation is operated. But the BLDC compressor can automatically control the number of revolution and so the amount of voltage consumption is relevantly small. It is found that the voltage is higher when using a general compressor than a BLDC compressor and it also consumes more power. In the case of the general compressor, a large amount of current is consumed instantly during the intial stages of operation due to the influences of the starting condenser and in the case of the BLDC compressor the consumption of current increases as the RPM increases but the amount of consumption in general is smaller. When comparing the amount of voltage consumption produced in the general compressor and the amount of current consumption produced by the starting condenser, the amount of power consumption was much higher. This shows that more electricity is consumed , in other words the amount of power consumption has been produced when operating a general compressor than a BLDC compressor. When using a general compressor, a maximum of approximately 850kgco2 is emitted. In the case of a BLDC compressor, it emits approximately 55kgco2 when the RPM is 1800rpm, about 105kgco2 when the RPM is 3000rpm and approximately 115kgco2 when the RPM is 3600 rpm. In other words, when a BLDC compressor is used less CO2 is emitted than when using a general compressor. This shows that although the amount of CO2 emitted by the general compressor appears to be high instantly, a larger amount will be emitted during normal operation compared with the BLDC compressor. That is, if the device has been stopped and operated repeatedly after setting a certain temperature, the general compressor will increase the amount of power consumption and the amount of CO2 emission will be increased. It also shows that in comparison with the BLDC compressor, Normally this amount can differ up to six times the amount, but maximum difference is 15 times.