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QUESTI 20 points Save An The heat-pump system shown is designed to provide water heating and space-cooling. The system includes a heat exchanger to subcool the R134a refrigerant at the outlet of the water heater while heating the refrigerant at the outlet of the evaporator. Given the following data, determine the enthalpy at each station, 1 through 6, using the R134a property tables (click here). Type your answers hy through h6 in the space provided below, and show all your work on your paper. . At the compressor inlet, T1 = 20°C and P, = 200 kPa. • At the compressor outlet, T2 = 105°C and P2 = 1.8 MPa. • At the water heater outlet, the refrigerant is in a saturated-liquid state. . At the outlet of the evaporator, the refrigerant is in a saturated-vapor state. . The power supplied to the compressor is comp = 3.3 kW, evaporator section condenser section

Answer 1

To find the enthalpoy at all the 6 points of the T-s diagram , we must use saturated and superheated vapor R134a tables. I have used from appendix of Thermodynamics an Engineering approach. Please refer to the attached images fir solution of given problem and do comment in case of any query. Good luck!!

all The refrigerant used as R134a, are acked to find the enthalpy at the 6 points of the Tas diagrom. Let's draw the The diagram T Heat trom peric beheeen points (3r) and (1-6) 5 6 1 s

Now at point 1, R134a enters the compressor at pr-200kPa, T1=20°c from Bigua thermodynamic property tablet at P, & T ha 270. IS II 1Kg.K At the outlet op compresor T2 = 105c, from R-134a superhealed table ho 330.92 KI Kg. P2 = 1 SMPa and SERIE

* Now let's find out may flow rate of refrigerant using compressor worth. lale mochz-hi) . mie 3.3 (330-92-27001%) 0.05 433 kats & Now refrigerant goes into the condenser sechon and comes out in saturated liquid at 1.smpa ha hea luu.07 kJ leg goce into a heat Now this saturated liquid refrigerant exchanger where at transfers heat to sah rated Vopor endre the proporcbox mo Chz-hy) manter Chi-hol Now he hg @ 2ook Pa a 2uu.ub. hus hz - Chicho) ( 270118 - 244.467 i hys 118.35 kilka Since expansion is aten thalpie buchs = 118.35 juu. 07

Find h1 to h6 in the images, they are the required answers. Please upvote this answer if you find my solution to be useful.