| Summary: | 碩士 === 國立中央大學 === 環境工程研究所碩士在職專班 === 100 === The reserved resources in the Earth are limited. However, the energy consumption is increased due to the rise of human living standard and the increase of population year by year. The usage of household appliances improves life comfort but consumes electrical power. Power generation can be reduced if power consumption is lowered. This study proposed a novel double-condenser refrigerator and assessed the energy conserved from this idea.
The studied double-condenser refrigerator is composed of an original refrigerator, an added outdoor condenser, and a detached outdoor compressor. In summer, the reduced power consumption of an indoor air conditioner can be assessed using the outdoor condenser for heat dissipation, while that of an indoor heater is evaluated through the usage of an indoor condenser in winter.
The assessments were made by adopting 23.8 0C as the switching temperature for the summer and winter modes, respectively. The results indicated that the outdoor condenser could employ a forced airflow help cooling and was thus with higher heat dissipation efficiency than just using the indoor condenser in the original refrigerator for the summer mode. By applying the same electrical power to both systems, the experimental results showed that the temperature was cooled down for an extra 2.22 0C with the help of an auxiliary fan as compared with no auxiliary fan. This also implies that the double-condenser refrigerator can increase the value of energy factor in a refrigerator. In addition, the outdoor condenser is capable of lowering the loading of the indoor air conditioner in summer. Take the commercialized refrigerator with a coefficient of performance at 1.86 and a daily power-consumption average at 2.2 kWh for an example, a saving of 2.09 kWh was found in a day. The greatest amount of money saved for the electrical bill of the air conditioner was estimated to achieve 1,436 NT dollars for the family with monthly power consumption exceeding 701 kWh in the summer mode. In the winter mode, the indoor condenser was opened; the produced heat could offset the leaked cold air from the refrigerator and still left with extra heat in the room. If the extra heat can be used to substitute the usage of an electrical heater, one kWh of the power consumption by the refrigerator will substitute for one kWh power from the electrical heater. For the refrigerator with a daily average of power consumption at 2.2 kWh, the same amount of power can be saved. The annual power consumption saved from the usage of the electrical heater will be 266.2 kWh as 121 days per year are estimated in need to turn on the electrical heater in Taipei. Consequently, the power cost saved for the family with monthly power consumption exceeding 701 kWh will be 1,198 NT dollars.
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