In a refrigerant recycling system, R134a is purified using a simple distillation process in which a heating plate is submerged in a pressurized reservoir which boils and evaporates the R134a, as shown in the figure. This recycling unit is made up of a square-based reservoir with a side of 25 cm, a pipe and a level valve into which the refrigerant fluid is introduced and its level is maintained constant as the condensate is removed. The refrigerant vapor is condensed by a slightly inclined copper plate placed on the top of the device and collected in a tray. The copper plate is externally cooled by liquid water at 25°C that flows at 3m/s. Determine:

The saturation temperature and mass flow rate of refrigerant condensate for the heating plate power 500W;

Construct a graph of the saturation temperature and the mass flow rate of refrigerant condensate as a function of the heating plate power ranging from 100 W to 1000 W.

Consider a refrigeration cycle using r-134a to maintain temperatureof blood storage space at -15 degrees C. The cycle consists of foursteady flow components.

R-134a passes through an evaporator (a heat exchanger) removingheat from the refrigerated storage space such that it exits theevaporator as saturated vapor at -20 degrees C. (State 1)

The refrigerant then enters a compressor where it is compressed tosaturated vapor at 5 bar. (State 2)

After exiting the compressor, R-134a enters a condenser (anotherheat exchanger) where it rejects heat to surrounding air at 10degrees C and exits as a saturated liquid at 5 bar. (State 3)

The refrigerant exiting the condenser passes through a throttlingvalve so that its pressure drops before entering the evaporator(state 4).

The mass flow rate of R-134a is 3kg/min.

(a) Draw a diagram showing all the components of the refrigerationcycle labeling all relevant states. Sketch another schematicshowing the refrigeration cycle and all its energy interactionswith surroundings.
(b)What capacity (kW) compressor is required to operate thecycle?
(c)Determine the specific volume of R-134a at the exit of theexpansion valve (or inlet to the evaporator)
(d)Calculate the CPO of the refrigeration cycle

A vapor-compression refrigeration system using Refrigerant 134a isbeing designed for a household food freezer. The refrigerationsystem must maintain a temperature of 18ºC
within the freezer compartment when the temperature of the room is32ºC. Under these conditions, the steady-state heat transfer ratefrom the room into the freezer compartment is 440 W. Specifyoperating pressures and temperatures at key
points within the refrigeration system and estimate the refrigerantmass flow rate and compressor power required.

Air conditioners operate on the same principle as refrigerators. Consider an air conditioner that has 7.00 of refrigerant flowing through its circuit each cycle. The refrigerant enters the evaporator coils in phase equilibrium, with54.0 of its mass as liquid and the rest as vapor. It flows through the evaporator at a constant pressure and when it reaches the compressor 95 of its mass is vapor. In each cycle, how much heat is absorbed by the refrigerant while it is in the evaporator? The heat of vaporization of the refrigerant is 1.50×105 .Express your answer numerically in joules. =5.15×105 Correct Part BIn each cycle, the change in internal energy of the refrigerant when it leaves the compresser is 1.20×105 . What is the work done by the motor of the compressor?Express your answer in joules. =1.20×105 Correct Part CIf the direction of the refrigerant flow is inverted in an air conditioner, the air conditioning unit turns into a heat pump and it can be used for heating rather than cooling. In this case, the coils where the refrigerant would condense in the air conditioner become the evaporator coils when the unit is operated as a heat pump, and, vice versa, the evaporator coils of the air conditioner become the condenser coils in the heat pump. Suppose you operate the air conditioner described in Parts A and B as a heat pump to heat your bedroom. In each cycle, what is the amount of heat released into the room? You may assume that the energy changes and work done during the expansion process are negligible compared to those for other processes during the cycle.Express your answer numerically in joules. =