| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 99 === The study intends to develop a cloth dryer with a portion of re-circulate the exhaust air directly back into the drum. The main purpose of the study is recovering of heat and reusing of the exhaust air to decrease the waste of the energy. The re-circulate of the exhaust air will be inducted to a mixing and dehumidifier chamber and mix with the air inside before the mixing air induct into the drum. Meanwhile the exhaust air will cause the temperature of the mixing air to be risen. As a result of the risen temperature of the intake air, the power consumption of the heater will be lowered and the total power consumption is also lowered as well.
The study discusses different designs of drying process of household clothes tumbler dryer. A parametric study was conducted to assess the effects of different re-circulation factor of the exhaust air on energy efficiency, drying efficiency and specific moisture extraction rate (SMER). The studies compare the energy efficiency, drying efficiency and specific moisture extraction rate (SMER) of the baseline with the different re-circulation factor.
According to the experimental measurement results, an optimal efficiency is found at a re-circulation factor of about 80%. As an addition, the energy savings are in the range of 25~30% and has smallest SMER as well as the highest drying efficiency. Besides that, including a dehumidify device inside the mixing chamber will increase the performance of the dryer more than only re-circulating the exhaust air.
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