Arefrigerator using refrigerant-134a as the working fluid operates on the vapor compression cycle. the cycle operates between 200 kpa and 1.2 mpa. the refrigerant flows through the cycle at a rate of 0.023 kg/s. the (actual) refrigerator has a compressor with an isentropic efficiency of 87%. the refrigerant enters the compressor slightly superheated by 7.6∘∘c (hint: add this to the saturation temperature). the refrigerant leaves the condenser slightly subcooled by 1°c. a)-what is the rate of heat removal from the refrigerated space for the actual refrigerator in kw? (b)- what is the power supplied to the compressor for the actual refrigerator in kw? c)-what is the cop for the actual refrigerator?

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg. a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?