A refrigerator uses refrigerant-134a as the working fluid and operates on vapor-compression refrigeration cycle. The pressures of the evaporator and condenser are 0.12 MPa and 0.8 MPa, respectively. The isentropic efficiency of the compressor is 0.85. The mass flow rate of the refrigerant is 0.1 kg/s. Assume that the refrigerator leaves the evaporator as saturated vapor, and leaves the condenser as saturated liquid, and disregard any heat transfer and pressure drops in the connecting lines between the components.(1) Show the cycle on a T-s diagram with respect to saturation lines; and Determine(2) the rate of heat removal from the refrigerated space;(3) the power input to the compressor;(4) the rate of heat rejection to the environment;(5) the coefficient of performance (COP)

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false