Water is boiled at 300 kPa pressure in a pressure cooker. The cooker initially contains 3 kg of water. Once boiling started, it is observed that half of the water in the cooker evaporated in 30 minutes. Assume negligible heat loss from the cooker.

The average rate of energy transfer to the cooker is 1.80 kW.

Explanation:

Given that,

Pressure of boiled water = 300 kPa

Mass of water = 3 kg

Time = 30 min

Dryness friction of water = 0.5

Suppose, what is the average rate of energy transfer to the cooker?

We know that,

The specific enthalpy of evaporate at 300 kPa pressure

We need to calculate the enthalpy of water at initial state

We need to calculate the enthalpy of water at final state

Using formula of enthalpy

Put the value into the formula

We need to calculate the rate of energy transfer to the cooker

Using formula of rate of energy

Put the value into the formula

Hence, The average rate of energy transfer to the cooker is 1.80 kW.

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