There is a steel tank with a 6 mm thick thin-walled mantle containing a gas under pressure. The Strain Gauge located in the mantle at 22.5º from the axial direction measured a 100 με deformation with increasing pressure from atmospheric pressure, determine: 1)Internal pressure.
2)Pond volume variation percentage (flat heads).
3)Maximum shear stress in the pond mantle.

Data: E = 2.1 x 1011 N / m2; v = 0.3.

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.