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PRACTICE / Convection

A steady surface can keep transferring heat

A plate stays at 60°C in air at 20°C. It loses 160 W solely through a convection model with h = 20 W/(m² K).

What exposed area does this model require?

Organize the givens & assumptions
  • Power lost = 160 W
  • h = 20 W/(m² K)
  • Surface–air temperature difference = 40 K

Uniform plate temperature and stated effective h; steady conditions, no radiative or other losses, and area is the total exchanging area.

  1. A0 m20\ \mathrm{m^2}
  2. B0.20 m20.20\ \mathrm{m^2}
  3. C0.40 m20.40\ \mathrm{m^2}
  4. D8 m28\ \mathrm{m^2}

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