Engineering, 13.11.2019 01:31 Nelly1828
Adormitory at a large university, built 50 years ago, has exterior walls constructed of l5 = 25-mm-thick sheathing with a thermal conductivity of k3 = 0. 1 w/m. k. to reduce heat losses in the winter, the university decides to encapsulate the entire dormitory by applying an li = 25-mm-thick layer of extruded insulation characterized by ki = 0. 029 w/m k to the exterior of the original sheathing. the extruded insulation is, in turn, covered with an lg = 5-mm-thick architectural glass with kg = 1. 4 w/m. k. determine the heat flux through the original and retrofitted walls when the interior and exterior air temperatures are tinfity, i = 22 degree c and tinfity, 0 = -20 degree c, respectively. the inner and outer convection heat transfer coefficients are hi = 5 w/m2 k and h0 = 25 w/m2 k. respectively.
Answers: 3
Engineering, 03.07.2019 14:10
If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.
Answers: 3
Engineering, 04.07.2019 18:20
Agas mixture consists of 8 kmol of h2 and 2 kmol of n2. determine the mass of each gas and the apparent gas constant of the mixture.
Answers: 3
Engineering, 04.07.2019 18:20
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, 04.07.2019 19:10
Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?
Answers: 3
Adormitory at a large university, built 50 years ago, has exterior walls constructed of l5 = 25-mm-t...
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