近來做Project要製造一個保暖的水杯…求救
回答 (2)
2007-04-09 10:11 pm
✔ 最佳答案
傳熱方法有三：Conduction, Convection 同 radiation.你要保暖就要減低個傳熱ge rate.
你F3物理應該都有學過
你可以同d heat conductivity唔高ge野例如木、發泡膠去做黎reduce conduction ge effect.
口係隻杯裏面包層銀色ge 野e.g. 錫紙 可以reduce radiation ge effect.
最好隻杯就有個cover 封到佢實一實啦~
2007-04-14 6:22 pm
先用d heat capacity 低既野做container(包括頂) (reduce heat loss by conduction)
之後用cotton包住上面果個野 (as air is a good heat insulator, cotton are used to trap the air)
再用錫紙包住 (reduce heat loss by radiation)
最後再用多個低heat capacity既包住 (further reduce heat loss by conduction)
之後用cotton包住上面果個野 (as air is a good heat insulator, cotton are used to trap the air)
再用錫紙包住 (reduce heat loss by radiation)
最後再用多個低heat capacity既包住 (further reduce heat loss by conduction)
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