3.4 2 kg of saturated liquid water at 120°C is heated in a piston-cylinder device with a variable load on the piston (meaning that the pressure is not constant in this process) until the volume of the water is five times greater compared to the volume at the start. In the final state, there is only saturated water vapor in the system. a) Calculate the volume of the water at the start in °C. What is the pressure at the start in kPa? b) Find temperature and pressure at the end of the process in °C and kPa respectively. c) Calculate the change in the water's internal energy in kJ in this process. d) Draw a P-v diagram of the process and show the states and the process curve relative to the saturation curve. Draw the isotherms (lines of constant temperature) that pass through the initial and final states.

If 3000 ft3 of air is crossing an evaporator coil and iscooled from 75F to 55F, what would be the volume of air, in ft3, exiting the evaporator coil?

3.1 Complete the table! The substance is water. Show your calculations and list which tables you have used. "Description of the condition' means that one should note whether the system is, for example, subcooled or in a saturated vapor phase etc. Condition 1. "C P, kPa h, kJ/kg x Description of the condition 400 0.8 175 1800 2 0.0 100 250,700 46 1200 3477.0 3.2 A tank with a fixed volume of 30 liters contains 0.2 kg of the refrigerant R-134a. At start the pressure is 100 kPa. Heat is added to the tank and the pressure increases to 180 kPa (final state). a) Determine the vapor quality of R-134a at the start. b) Determine the temperature in the final state in "C. c) Draw a Pv diagram of the process and show the states and the process curve relative to it the saturation curve. 3.3 A piston-cylinder device initially contains steam at 5 MPa, which is superheated by 36.06°C. The piston-cylinder device is equipped with "stoppers", see figure below the task text. The steam is cooled at…

How much energy (in Joules) is required to fully melt 20g of ice taken from the freezer at - 5 degree C (negative 5 C), put on a stove and gently heated until fully molten?