The curing press of Example 1.9 involves exposure of the plate to irradiation from an infrared lamp andattendant cooling by convection and radiation exchangewith the surroundings. Alternatively, in lieu of thelamp, heating may be achieved by inserting the plate inan oven whose walls (the surroundings) are maintainedat an elevated temperature. (a) Consider conditions for which the oven walls areat 200°C, airflow over the plate is characterized by T ∞ = 20 ° C and h = 15 W/m 2 ⋅ K , and the coatinghas an emissivity of ∈ = 0.5 , What is the temperature of the plate? (b) For ambient air temperatures of 20, 40, and 60°C, determine the plate temperature as a function of theoven wall temperature over the range from 150 to250°C. Plot your results, and identify conditions forwhich acceptable curing temperatures between 100 and 110°C may be maintained.
The curing press of Example 1.9 involves exposure of the plate to irradiation from an infrared lamp andattendant cooling by convection and radiation exchangewith the surroundings. Alternatively, in lieu of thelamp, heating may be achieved by inserting the plate inan oven whose walls (the surroundings) are maintainedat an elevated temperature. (a) Consider conditions for which the oven walls areat 200°C, airflow over the plate is characterized by T ∞ = 20 ° C and h = 15 W/m 2 ⋅ K , and the coatinghas an emissivity of ∈ = 0.5 , What is the temperature of the plate? (b) For ambient air temperatures of 20, 40, and 60°C, determine the plate temperature as a function of theoven wall temperature over the range from 150 to250°C. Plot your results, and identify conditions forwhich acceptable curing temperatures between 100 and 110°C may be maintained.
Solution Summary: The author analyzes the temperature of the plate that is inserted in the oven.
The curing press of Example 1.9 involves exposure of the plate to irradiation from an infrared lamp andattendant cooling by convection and radiation exchangewith the surroundings. Alternatively, in lieu of thelamp, heating may be achieved by inserting the plate inan oven whose walls (the surroundings) are maintainedat an elevated temperature. (a) Consider conditions for which the oven walls areat 200°C, airflow over the plate is characterized by
T
∞
=
20
°
C
and
h
=
15
W/m
2
⋅
K
, and the coatinghas an emissivity of
∈
=
0.5
, What is the temperature of the plate? (b) For ambient air temperatures of 20, 40, and 60°C, determine the plate temperature as a function of theoven wall temperature over the range from 150 to250°C. Plot your results, and identify conditions forwhich acceptable curing temperatures between 100 and 110°C may be maintained.
A horizontal copper plate 10 cm thick is initially uniform in temperature at 250◦C.The bottom surface of the plate is insulated. The top surface is suddenly exposed toa fluid stream at 80◦C. After 6 min the surface temperature has dropped to 150◦C.Calculate the convection heat-transfer coefficient that causes this drop.
The cartel dimensions of a vehicle are 0.6m long, 0.2m wide and 0.1m high, and the crankcase surface temperature is 350K. Calculate the heat loss flow rate from the crankcase to the atmosphere where the ambient air temperature is 276K while this vehicle is traveling at 30km/h.
2.2: Water at a temperature of T∞= 25°C flows over one ofthe surfaces of a steel wall (AISI 1010) whose temperatureis Ts,1= 40°C and thermal conductivity of steel is 671 w/m.k. The wall is 0.35 m thick, and itsother surface temperature is Ts,2= 100°C. For steadystateconditions what is the convection coefficient associatedwith the water flow?
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