Polyvinylchloride automotive body panels (k = 0.092 W/m K, c p = 1.05 kJ/kg K,
Question:
Polyvinylchloride automotive body panels (k = 0.092 W/m · K, cp = 1.05 kJ/kg · K, ρ = 1714 kg/m3), 3-mm thick, emerge from an injection molder at 120°C. They need to be cooled to 40°C by exposing both sides of the panels to 20°C air before they can be handled. If the convective heat transfer coefficient is 30 W/m2 · K and radiation is not considered, the time that the panels must be exposed to air before they can be handled is
(a) 1.6 min
(b) 2.4 min
(c) 2.8 min
(d) 3.5 min
(e) 4.2 min
Fantastic news! We've Found the answer you've been seeking!
Step by Step Answer:
Related Book For
Heat And Mass Transfer Fundamentals And Applications
ISBN: 9780073398181
5th Edition
Authors: Yunus Cengel, Afshin Ghajar
Question Posted: