Problem 1: Superheated water vapor at 1.4 MPa and 250 C is allowed to cool at constant volume until the temperature drops to 125 C. At the final state, determine (a) the pressure, (b) the quality, (c) the enthalpy. Problem 2: Complete the following table using the property tables for refrigerant-134a. Show the complete steps in finding the missing information of each state. If x is undefined, include that as a comment. T (°C) P (kPa) v (m³/kg) -4 320 10 0.0065 850 140 0.2 Problem 3: Diffuser x Phase Description Compressed Liquid Saturated Mixture Saturated Vapor Superheated Vapor V₂ << V₁ Calculate the velocity at the exit of a diffuser when air at 100 kPa and 30°C enters it with a velocity of 350 m/s and the exit state is 200 kPa and 90°C. Note: do not use the specific heat method - find the enthalpy directly from EES (the tutorial videos describe how to find the properties of each state).

Fig: 1