zad. 1
Oblicz temperaturę końcową po włożeniu 1 kg aluminium o temperaturze 200 °C
do 1 litra wody o temperaturze pokojowej 20°C.
Dane:
m-1kg
t1 - 20°C
mw -10 kg
t2-20°C
Cw-420 J/kg Qpob =Qodd.
Cw mw * (x-t2) =Cal * m*(t1-t)
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mp=1kg
Cwp=4,2kJ/kg C
Tpp = 20C
mo=1kg
Tpo=200C
Cwo=0,9kJ/kg C
Cwp mp (Tk-Tpp)=Cwo mo (Tpo-Tk)
Cwp mp Tk-Cwp mp Tpp=Cwo mo Tpo-Cwo mo Tk
Cwp mp Tk + Cwo mo Tk=Cwo mo Tpo + Cwp mp Tpp
Tk (Cwp mp + Cwo mo)=Cwo mo Tpo + Cwp mp Tpp
Tk=Cwo mo Tpo + Cwp mp Tpp/Cwp mp + Cwo mo
Tk=0,9 x 1 x 200 + 4,2 x 1 x 20 / 4,2 x 1 + 0,9 x 1
Tk=180 + 84 / 5,1
Tk=51,76 C