Engineering, 16.10.2019 05:20 itzia00
Acartridge electrical heater is shaped as a cylinder of length l = 300 mm and outer diameter d = 30 mm. under normal operating conditions, the heater dissipates 2 kw while submerged in a water flow that is at 20 c and provides a convection heat transfer coefficient of ° w/m2 h = 5000 k. neglecting heat transfer from the ends of the heater, determine its surface temperature ts and the thermal resistance due to convection. if the water flow is inadvertently terminated while the heater continues to operate, the heater surface is exposed to air that is also at c but for which w/m2 20° h = 50 k. what are the corresponding thermal resistance due to convection and surface temperature? what are the consequences of such an event?
Answers: 1
Engineering, 04.07.2019 18:10
Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.
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Engineering, 04.07.2019 18:20
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Engineering, 06.07.2019 03:10
Steel balls 12 mm in diameter are annealed by heating to 1150 k and then slowly cooled to 400 k in an air att 325 k and h -20 w/m2 k. assume the properties of the steel to be k- 40 w/m k,p 7800 kg/m3, and cp 600 j/kg k. a. determine whether lumped system method can be used to analyze this problem and if so why" b. determine the time required for the cooling process. c. determine the total amount of heat lost from each ball to the ambient air
Answers: 1
Engineering, 06.07.2019 03:20
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