Question

A 0.1 m3 pressurised cooking pot operates at 250 kPa. Upon reaching the pressure, a valve opens to let out steam (controlled leak) at that pressure as a safety precaution. During a cooking session, the valve was open for 10 mins during which time the amount of liquid in the pot decreased by 0.0003 m3. The valve has a radius of 2.15 mm. Saturation conditions can be assumed to exist in the vessel. Determine the following: a. Using the appropriate property tables determine the following: i. Specific volume of the liquid, ?& ii. Specific volume of the steam, ? ' iii. Specific internal energy of the steam, ?' iv. Specific enthalpy of the steam, h' b. Rate at which mass flows out from the pot c. Steam velocity at the safety valve d. Flow energy of the steam per unit mass (Hint: Use property table to determine properties at 500 kPa)

Answer 1