Problem 39HP
Discuss the factors that would make the heat pump described in Problem 4.123 an irreversible cycle.
Problem 4.123
An R410a heat pump cycle shown in Fig. P4.123 has an R410a flow rate of 0.05 kg/s with 5 kW into the compressor. The following data are given:
State 
1 
2 
3 
4 
5 
6 
P, kPa 
3100 
3050 
3000 
420 
400 
390 
T, °C 
120 
110 
45 

−10 
−5 
h, kJ/kg 
377 
367 
134 
— 
280 
284 
Calculate the heat transfer from the compressor, the heat transfer from the R410a in the condenser, and the heat transfer to the R410a in the evaporator.
FIGURE P4.123
Solution 39 HP:
Step 1 of 1:
Here we have to discuss the factors that would make the heat pump as irreversible cycle.
The mass flow rate is 0.05 kg/s.
The discussion is shown below:
 The pressure will be decreased through all the lines.
 The inside pressure of the compressor will also be decreased.
 There will be catastrophic heat transfer into the compressor which will cause severe damage.
 There will be leak in the backward flow which will lead to decrease in pressure abruptly.
 In line 3 to 4, there will be throttle process.