物理功課-太陽能熱水器

2011-11-23 12:00 am
溫度16度的冷水慢慢從底部流入吸熱管,每分鐘有0.18kg溫度達到80度的熱水流出吸熱管並入頂部的儲水缸。
(a)求每一分鍾水流過吸熱管進入儲水缸所吸收的能量
(b)求該熱水器的能量轉換功率
(c)在猛烈陽光的日子裏,照射到地面的太陽能量功率約為550Wm^-2
,約吸熱管的表明面積為3m^2,並接受陽光垂直照射求該熱水器的能量轉換效率要完整步驟
thx!!!!!!

回答 (1)

2011-11-23 1:00 am
✔ 最佳答案
(a) Heat absorbed in 1 minute = 0.18 x 4200 x (80-16) J = 48,384 J
where 4200 J/kg-C is the specific heat capacity of water

(b) Energy conversion power (能量轉換功率) = 48384/60 w = 806 w

(c) Power supplied by insolation = 550 x 3 w = 1650 w
Heat supplied in 1 minute = 1650 x 60 J = 99,000 J
Hence, efficiency = 48384/99000 x 100% = 49%


收錄日期: 2021-04-15 15:39:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111122000051KK00451

檢視 Wayback Machine 備份