Engineering, 16.03.2020 18:55 bibi43232
In an IR detector, the sensor housing is held at 80 K by a mechanical cooler. The sensor is mounted to a frame that runs at 200 K by four thin walled hollow tubes that are 5.08 cm long by 1.27 cm outer diameter. The total heat leak through the four tubes into the detector has to be kept at less than 200 mW. Assuming G-10 (0.5 W/m-k) is used, find the wall thickness for the tube required to meet the heat leak condition. What if 6061-T6 (167.1 W/m-k) aluminum is used instead
Answers: 2
Engineering, 04.07.2019 18:20, Doogsterr
For each of the following process: a) sketch the p-v diagram, b)sketch t-s diagram, c) sketch t-v diagram, d) sketch the boundary work on one of the diagrams (a, b or c) and e) sketch the reversible heat transfer on one of the diagrams (a, b or c): 1- isobaric process from compressed liquid to superheated vapor 2- isothermal process from compressed liquid to superheated vapor 3- isentropic process from compressed liquid to superheated vapor
Answers: 3
Engineering, 06.07.2019 03:10, tyheath42
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
In an IR detector, the sensor housing is held at 80 K by a mechanical cooler. The sensor is mounted...
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