2- A restaurant has a pizza oven in the middle of the kitchen. The oven burns natural gas at a fixed flow rate and its wall consists of three solid layers of insulation.
A) Simplify the heat diffusion equation for the furnace wall at steady state.
B) Write the equations for boundary conditions at both sides of the wall.
C) Draw the temperature profile throughout the wall assuming kA > kB > kC.

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.