Refrigerant 134a enters the condenser of a residential heat pump at 800 kPa and 55 oC at a rate of 0.018 kg/s and leaves at 750 kPa and saturated liquid condition. The refrigerant enters the compressor at 200 kPa superheated by 5 oC. Determine a) the isentropic efficiency of the compressor, b) the rate of heat supplied to the room and c) the COP of the heat pump.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.

Manometers are good examples of measuring instruments, nowadays they are not as common as before. a)-capacitive probe gauges b)-gravitational gauges deformation ) gauges d)-digital gauges