3.19 The wall of a drying oven is constructed by sandwich Insulation, ing an ins

Question

3.19 The wall of a drying oven is constructed by sandwich Insulation, ing an insulation materia of therma conductivity 005 W/m K between thin metad sheets The oven ar is a T300 C, and the corresponding convection radiation, st convection coeffi- 0 W/m?-K. Theinner wall surface absorbs flux of qra, 100 Wmp trom hotter objects I and label al within the oven. The room ar is at T overall ooetfidient for convection and radation from the outa surface is l 10 Wmf . K. 25C, and the ( Draw the thermal dirauit tor the wall and labe temperatures, heat rates, and thermal resisances the outer wal surface aa a safe-to-touch tempera tureof T,-40 C? (b) What insulation thickness L is required to maintan Insulation, k 0.05 W/m-K Grad 100 W/m2 Oven alr Ambient alr Toj 300°c T 250C go 0 Red 0 ai grad 0.0 333m7. k/w Convi 0-OS s hD

Explanation / Answer

That direction is a misprint. Because you can see here that outermost surface temperature of the oven is 40* C and ambient air temperature is 25*C.

According to the second law of thermodynamics heat transfer from high temp. to low temp.

Hence, that direction is missprint.

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

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