There is a mixing chamber connected with a valve. The chamber has two inlets and one exits. Liquid water at 200 kPa and 20 °C is heated in a chamber by mixing it with superheated steam at 200 kPa and 200 °C. Liquid water enters the mixing chamber at a rate of 2.5 kg/s, and the chamber is estimated to lose heat to the surrounding air at a rate of 1200 kJ/min. The mixture leaves the mixing chamber at 200 kPa and 70 °C. Assume steady state and ignore kinetic and potential energy effects. Assume there is no work or heat involved in the valve. Required:
a. If take the mixing chamber as the control volume, please list the simplified energy conservation equation for this CV.
b. If taking the mixing chamber and the valve as the combined control volume, please list the simplified energy conservation equation for this CV (leave it in symbolic form).
c. What is the mass flow rate at state 2?
d. There is a valve at the exit of the chamber to reduce the pressure to 20 kPa, determine the temperature at the exit of the valve