Regenerative gas refrigeration cycle: Pressure Ratio = 5, Compressor inlet temp. = 00C, Turbine inlet temp. = - 800C, Regenerator inlet (from the compressor side) temp. = 350C, Efficiency of the turbine = 85% and the efficiency of the compressor = 80%. Consider constant specific heats with Cp = 1.005 kJ/kg. K, k = Cp/Cv =1.4. Determine: (a) The effectiveness of the regenerator, (b) the heat removal in kJ/kg, and (c) the COP of the cycle. Also, find the Refrigeration load in kJ/kg and the COP for a simple refrigeration cycle with rp = 5, compressor inlet temperature of 00C and turbine inlet temperature of 35oC

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Aheavily insulated piston-cylinder device contains 0.02 m3 of steam at 300 kpa and 200 °c. 1.2 mpa. d this process. team is now compressed in a reversible manner to a pressure of etermine the entropy change and the work done on the steam during this process