Acup of coffee of volume 0.3 l is heated from a temperature of 25 ? c to 65 ? c at a pressure of 100 kpa. determine the change in the internal energy (? u), enthalpy (? h), and entropy (? s). assume the density and specific heat of coffee to be 1100 kg/m3 and 4.1 kj/(kg? k) respectively. determine the change in the internal energy (? u), enthalpy (? h), and entropy (? s).

Air (c-1.006 kj/kg. k, r-0.287 kj/kg. k) enters a nozzle steadily at 280 kpa and 77°c with a velocity of 50 m/s and exits at 85 kpa and 320 m/s. the heat losses from the nozzle to the surrounding medium at 20°c are estimated to be 3.2 kj/kg. determine (a) the exit temperature and (b) the total entropy change for this process. solve this problem using constant specific heats.

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

What does stp and ntp stands for in temperature measurement?