The front door of a dishwasher of width \(580 \mathrm{~mm}\) has a vertical air vent that is \(500 \mathrm{~mm}\) in height with a \(20-\mathrm{mm}\) spacing between the inner tub operating at \(52^{\circ} \mathrm{C}\) and an outer plate that is thermally insulated.

(a) Determine the rate of heat loss from the tub surface when the ambient air is \(27^{\circ} \mathrm{C}\).

(b) A change in the design of the door provides the opportunity to increase or decrease the \(20-\mathrm{mm}\) spacing by \(10 \mathrm{~mm}\). What recommendations would you offer with regard to how the change in spacing will alter heat losses?

Transcribed Image Text:

Tub 7 = 52C- Insulated surface Air