Shrimp dumplings are cooked by condensing steam on them . One such cooker supplies steam at 110 °C at the rate of 0.1 kg / min .
(Given c(steam ) = 2000J kg ^ -1 °C^-1 .
Calculate the power , in watts , at which the steam cooker supplies energy if the steam condenses to water at 100 °C .
physics F.4
2011-12-27 6:06 am
回答 (1)
2011-12-27 7:29 am
✔ 最佳答案
Consider a time interval of 1 min, the mass of steam supplied = 0.1 kgHeat released by the steam when condensed to water at 100 °C
= 0.1 x [2000 x (110-100) + 2.26 x 10^6 ] J
where 2.26 x 10^6 J/kg is the latent heat of vapourization of water
hence, heat released = 2.28 x 10^5 J
Therefore, power supplied = 2.28 x 10^5/60 J/s = 3800 J/s = 3800 w
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