14.20 from textbook a process that can be modeled as a time delay (gain = 1) is controlled using a proportional feedback controller. the control valve and measurement device have negligible dynamics and steady-state gains of kv = 0.5 and km = 1, respectively. after a small set-point change is made, a sustained oscillation occurs, which has a period of 10 min.
(a) what controller gain is being used? explain.
(b) how large is the time delay?

Aheat pump using refrigerant-134a heats a house by using underground water at 8°c as the heat source. the house is losing heat at a rate of 60,000 kj/h. the refrigerant enters the compressor at 280 kpa and 0°c, and it leaves at 1 mpa and 60°c. the refrigerant exits the condenser at 30°c. determine: (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump