| Summary: | 碩士 === 國立中央大學 === 能源工程研究所 === 99 === In this study, a silica gel-water adsorption system is designed and the system performance is measured. Two different adsorption beds and two different condensers are tested in the experiment. One adsorption bed is made by 3mm diameter copper tubes and the thickness of coated silica gel is 2mm. The silica gel weight of copper-tubes adsorption bed is 0.8 kg. Another adsorption bed is made by flat-tube heat exchanger whose volume and thickness of silica gel are the same as copper-tube adsorption bed. The weight of silica gel is 1.46 kg. The first condenser is a copper tube heat exchanger; another is a fin-tube heat exchanger.
In experimental condition, there are two different temperatures of hot water, 75 and 80℃; two different temperatures of cooling water, 25 and 30℃. The temperature of cold water is 20℃. The cycle time are 6、12 and 20 minutes in copper-tube adsorption bed experiment. And in flat-tube adsorption bed experiment, the cycle time are 20、30 and 40 minutes.
The result shows that the copper-tube adsorption bed doesn’t refrigerate the water of evaporator. It is because that the cooling power of copper-tube adsorption bed is not enough to cool the heat capability of total vacuumed chamber. And it also indicates that the higher temperature of hot water、the lower temperature of cooling water and the longer cycle time, the COP(coefficient of performance) of flat-tube adsorption bed is higher. And COP doesn’t increase by replacing the copper-tube condenser to fin-tube condenser.
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