A home pressure cooker allows to increase the temperature of boiling water thus

Question

A home pressure cooker allows to increase the temperature of boiling water thus reduce cooking time. The pressure cooker under consideration has an internal volume of 0.005 m^2. It is equipped with a pressure regulator that limits the gauge pressure inside the cooker to a release pressure of 99 kPa. (The pressure regulator is closed when the pressure is below the release pressure.) Cooking time is counted from the time when the cooker reaches the release pressure (t = 0 s). At t=0 s. the cooker contains 200g of saturated water. The cooker is placed on a heater mat provides a constant Q = 250 W to the contents of the cooker. The conditions are such that water should remain saturated throughout the cooking process.

Explanation / Answer

a)This is a stedy state process.Because the state of within the cv changes uniformly

b) The cooking temperatur is the saturation temperature.Terefore from steam tables at 99kpa Temperaure = 102.24oc

c)Quality of water at t=0

x = v1 - vf/vfg

From steam tables x = 0.09

d)m = density * v = 1.02 * 0.005 = 5.1kg

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