Engineering, 12.08.2020 06:01 queenbee2994
A thermocouple junction with a diffuse and gray surface is placed in a large environment of temperature at T. The junction is used to measure the temperature of a moving fluid surrounding the surface. The heat transfer coefficient is h. The total hemispherical irradiation from the environment incident on the small surface is. The total hemispherical emissivity of the surface is 0.95. Determine the following:
A) What is the radiation energy incident on the surface per unit time (q_irra)?
B) What is the total hemispherical absorptivity alpha?
C) What is the radiation energy absorbed by the surface per unit time q_abs?
D) If after steady state, the temperature of the junction senses a temperature of 320 K, what is the total hemispherical emitted power E from the junction surface?
E) What is the radiation energy emitted from the junction surface per unit time q_emit?
F) Apply energy balance to the junction after steady state. Neglect the contribution from the thermocouple wires. Calculate the temperature of the fluid. What is the major reason that the temperature of the fluid cannot be accurately measured by the thermocouple junction?
Answers: 2
Engineering, 03.07.2019 14:10, BardiFan
Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.
Answers: 3
Engineering, 03.07.2019 15:10, margaret1758
If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.
Answers: 1
Engineering, 04.07.2019 18:10, DestyHilBan1183
Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.
Answers: 3
A thermocouple junction with a diffuse and gray surface is placed in a large environment of temperat...
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