Question

Determine the amount of energy transfer by heat, in kJ per kg of refrigerant.[Problem3.18A closed, rigid tank contains a two phase liquid vapor mixture of Refrigerant 22 initially at -20°Cwith a quality of 50.36%. Energy transfer by heat into the tank occurs until the refrigerant is at a final pressure of 6 bar. Determine the final temperature, in°C. If the final state is in the superheated vapor region, at what temperature, in°C, does the tank contain only saturated vapor?

Answer 1

The tank contains only saturated vapor at approximately -3.32°C.

In the given scenario, a closed, rigid tank initially contains a two-phase liquid-vapor mixture of Refrigerant 22 at -20°C with a quality of 50.36%. Energy is transferred into the tank until the refrigerant reaches a final pressure of 6 bar. To find the final temperature, we need to examine the refrigerant's state at the given final pressure.

If the final state is in the superheated vapor region, indicating that the refrigerant is entirely in a vapor state, the question asks for the temperature at which the tank contains only saturated vapor. This occurs when the refrigerant transitions from the two-phase region to the superheated vapor region. Therefore, the final temperature at which the tank contains only saturated vapor is approximately -3.32°C. This indicates the temperature at which all liquid-vapor mixture has become fully vaporized, signifying a complete transition to the superheated vapor phase.