A thermopane window consists of two glass panes, each 0.50 cmthick, with a 1.0-c

Question

A thermopane window consists of two glass panes, each 0.50 cmthick, with a 1.0-cm-thick sealed layer of air in between. If theinside surface temperature is 23.5°C and theoutside surface temperature is 0.0°C, determine the rate ofenergy transfer through 2.0m2 of the window. Compare your answer with the rate ofenergy transfer through 2.0m2 of a single 1.0-cm-thick pane of glass. thermopane window (J/s)? single pane window (J/s)? A thermopane window consists of two glass panes, each 0.50 cmthick, with a 1.0-cm-thick sealed layer of air in between. If theinside surface temperature is 23.5°C and theoutside surface temperature is 0.0°C, determine the rate ofenergy transfer through 2.0m2 of the window. Compare your answer with the rate ofenergy transfer through 2.0m2 of a single 1.0-cm-thick pane of glass. thermopane window (J/s)? single pane window (J/s)?

Explanation / Answer

We know that             P = A (T) / R   where R = L / k For thermopane            R =2Rpane + Rair               = 2 (L1 / k1) + L2/k2               = 2 ( 0.50 x 10-2 / 0.84] + [1.0 x 10-2 / 0.0234]               = 0.44 m2 * oC / w Therefore          P = 2.0 * 23.5 /0.44            = 106.8 W            = 106.8 J/s for 1 cm thick pane         R = 1.0 x 10-2 /0.84            = 1.2 x 10-2 m2 *oC / W         P ' = 2 * 23.5 /1.2 x 10 - 2             = 3.916 kW             = 3.916 k J/s

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.