2. There is a 1000 W iron with a soleplate of 2.5 mm thick aluminum alloy (alloy density: 2,770 g/cm' and Cp = 875 J/kg °C). The surface area of the soleplate of this iron has an area of 600 cm2. Initially, the iron is known to have a thermal equilibrium with the ambient air at 22 °C. It is known that 85 percent of the heat generated in the resistance wires is transferred to the plate. The minimum time required for the plate temperature to reach 140°C.
2. There is a 1000 W iron with a soleplate of 2.5 mm thick aluminum alloy (alloy density: 2,770 g/cm' and Cp = 875 J/kg °C). The surface area of the soleplate of this iron has an area of 600 cm2. Initially, the iron is known to have a thermal equilibrium with the ambient air at 22 °C. It is known that 85 percent of the heat generated in the resistance wires is transferred to the plate. The minimum time required for the plate temperature to reach 140°C.
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Transcribed Image Text:1. Complete the table below on the basis of the conservation of energy principle for a closed
system
Wout
e, - e
Btu/lbm
Q.
E
Btu
E2
Btu
Btu
Btu
Ibm
350
1020
860
3
-
350
130
550
5
260
600
1400
2
7
150
-500
900
-50
1000
3
-200
2. There is a 1000 W iron with a soleplate of 2.5 mm thick aluminum alloy
(alloy density: 2,770 g/cm' and Cp = 875 J/kg °C). The surface area of the
soleplate of this iron has an area of 600 cm2. Initially, the iron is known to
have a thermal equilibrium with the ambient air at 22 °C. It is known that
85 percent of the heat generated in the resistance wires is transferred to the
plate. The minimum time required for the plate temperature to reach 140°C.
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