You move that up and down with a little bit of energy but now you're only shifting the air down to the hot end and up to the cold end, down to the hot end and up to the cold end.
それを動かすのに少しエネルギーが要るが 空気を熱極と冷極の間を動かすだけ 空気を熱極と冷極の間を動かすだけ