A pressure cooker contains 1.5 kg of saturated steam at 5 bar. Find the quantity of heat which mustbe rejected so as to reduce the quality to 60% dry. Determine the pressure and temperature of thesteam at the new state.
Question
A pressure cooker contains 1.5 kg of saturated steam at 5 bar. Find the quantity of heat which mustbe rejected so as to reduce the quality to 60% dry. Determine the pressure and temperature of thesteam at the new state.
Solution
To find the quantity of heat that must be rejected in order to reduce the quality of the steam to 60% dry, we can use the concept of specific enthalpy.
Step 1: Determine the initial state of the steam. Given: Mass of steam (m) = 1.5 kg Pressure (P1) = 5 bar
Step 2: Determine the initial specific enthalpy of the steam. Using steam tables or specific enthalpy tables, we can find the specific enthalpy (h1) of saturated steam at 5 bar.
Step 3: Determine the final state of the steam. Given: Quality (x2) = 60% dry
Step 4: Determine the final specific enthalpy of the steam. Using steam tables or specific enthalpy tables, we can find the specific enthalpy (h2) of 60% dry steam.
Step 5: Calculate the quantity of heat to be rejected. The quantity of heat (Q) can be calculated using the equation: Q = m * (h1 - h2)
Step 6: Determine the pressure and temperature of the steam at the new state. Using steam tables or the saturated steam equation, we can find the pressure and temperature corresponding to the specific enthalpy (h2) of 60% dry steam.
By following these steps, you will be able to find the quantity of heat that must be rejected and determine the pressure and temperature of the steam at the new state.
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