An Study of the R404A Refrigerant Variation for Energy Saving

• Main Authors: JENN-FANG WANG, 王振芳
• Other Authors: Chih-Hu Wang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/21668834728296510606

碩士 === 中華大學 === 電機工程學系碩士班 === 99 === Taiwan is lacking in self-produced energy. 99.3% of the energy supply depends on imports. More than 2.3 billion degrees of power consumption of refrigeration and air conditioning are spent each year. Freezing (refrigeration) equipment for long-time power consumptive may be power-hungry but there is great room for improvement of saving energy; but there is a lack of research on the application of information network monitoring freezer (refrigeration) equipment operating conditions and the cycle performance and how power consumption effects performance of variation on the R404a refrigerant filling volume of freezing (refrigeration) equipment. This report specifically focuses on the research of area 3.24M2, combined freezer with R404a refrigerant and the temperature of the decline in speed and power consumption in the bank from 20℃ down to -20℃. Measurement process is the application of a freezer monitoring system which constitutes the market selling of web-based remote monitoring and temperature and pressure sensors. In the situation of a vacuum in the freezer, the variation causes of the leakage of liquid or gaseous R404a refrigerant, and establishes a network to collect the freezer refrigerant into the sensor, the temperature and pressure values, the data conversion, calculation, analysis and other procedures to change volume of refrigerant to the freezer cycle performance and energy impact. During the experiment, the application of information networks, sensor system for frozen (refrigeration) equipment operating performance analysis and troubleshooting, etc. are helpful. The experimental results show that when the area 3.24M2 modular freezer using R404a gaseous or liquid refrigerant, the refrigerant leakage caused by the amount of change, its storage temperature affects the rate of decline. When using the base refrigerant filling volume of 5kg, the refrigerant filling volume of the base 60% (inclusive), the Cooling Capacity Refrigerant of the drop time and storage temperature difference is small, such as the refrigerant capacity of the base 40%, the temperature of an environment and slow cooling, if the expected value of its running time is desired to be longer and is less than the base 20% (inclusive), the running time is still unable to make the environment temperature drop below 0℃. In this study, experimental measurement of the freezer system, temperature, pressure sensor installation location selected Mo Lier curve and operating conditions, energy analysis conclusions will serve as the baseline of frozen (refrigeration) Smart Device monitoring and diagnosis system of the pre-study reference.