Question

Question 1: (20 points) Apply both conservation of mass and conservation of energy principles to provide the mass and energy balances for the insulated system shown in the figure below. W$_b$ Moving boundary W$_e$ W$_{sh}$ Question 2: (80 points) Consider the heat pump diagram shown in the figure below with Refrigerant 134a as the working fluid, the mass flow rate at state 1 is 6.98 kg/min, and the power input to the compressor is 5.169 kW. a) Draw the cycle on T-s and P-v diagrams. b) Determine the coefficient of performance for the heat pump COP$_{Hp}$. c) If we put a turbine instead of the expansion valve, this would provide a power output from the cycle and thus reduces the power input of the system. Is it recommended to implement this power saving measure? Explain. d) What if we eliminate the valve from the system? Explain what would happen.

          Question 1:
(20 points)
Apply both conservation of mass and conservation of energy
principles to provide the mass and energy balances for the
insulated system shown in the figure below.
W$_b$
Moving
boundary
W$_e$
W$_{sh}$
Question 2:
(80
points)
Consider the heat pump diagram
shown in the figure below with
Refrigerant 134a as the working fluid, the mass flow rate at
state 1 is 6.98 kg/min, and the power input to the compressor
is 5.169 kW.
a) Draw the cycle on T-s and P-v diagrams.
b) Determine the coefficient of performance for the heat
pump COP$_{Hp}$.
c) If we put a turbine instead of the expansion valve, this
would provide a power output from the cycle and thus
reduces the power input of the system. Is it
recommended to implement this power saving measure?
Explain.
d) What if we eliminate the valve from the system? Explain
what would happen.

Question 1:
(20 points)
Apply both conservation of mass and conservation of energy
principles to provide the mass and energy balances for the
insulated system shown in the figure below.
Wb
Moving
boundary
We
Wsh
Question 2:
(80
points)
Consider the heat pump diagram
shown in the figure below with
Refrigerant 134a as the working fluid, the mass flow rate at
state 1 is 6.98 kg/min, and the power input to the compressor
is 5.169 kW.
a) Draw the cycle on T-s and P-v diagrams.
b) Determine the coefficient of performance for the heat
pump COPHp.
c) If we put a turbine instead of the expansion valve, this
would provide a power output from the cycle and thus
reduces the power input of the system. Is it
recommended to implement this power saving measure?
Explain.
d) What if we eliminate the valve from the system? Explain
what would happen.

Added by Steven F.

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