TITLE.PM5

738 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-2.pm5 compressor. This superheating may occur as a result of the type of expa ...

REFRIGERATION CYCLES 739 dharm \M-therm\Th14-2.pm5 14.3.9. Volumetric efficiency A compressor which is theoretically perfect wou ...

740 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-2.pm5 or p p v v d s n = F HG I KJ 4 3 or v 4 = v 3. p p d s F n HG I KJ 1/ I ...

REFRIGERATION CYCLES 741 dharm \M-therm\Th14-2.pm5 (ii)Mass of refrigerant. Mass of refrigerant circulated (per second per tonne ...

742 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-2.pm5 before being returned to the evaporator. The separation is accomplished ...

REFRIGERATION CYCLES 743 dharm \M-therm\Th14-3.pm5 In this system the work done on compression is less than in vapour compressio ...

744 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-3.pm5 14.4.4. Comparison between Vapour Compression and Vapour Absorption Sys ...

REFRIGERATION CYCLES 745 dharm \M-therm\Th14-3.pm5 0.2232 + x 3 × 138 298 = 0.1251 + 0.6 × 154 268 = 0.4698 ∴ x 3 = (0.4698 – 0. ...

746 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-3.pm5 Temp. Enthalpy (kJ/kg) Entropy of liquid Entropy of vapour °C (kJ/kg K) ...

REFRIGERATION CYCLES 747 dharm \M-therm\Th14-3.pm5 Actual refrigerating effect per kg = C.O.P.(actual) × work done = 5.52 × (h 3 ...

748 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-3.pm5 T (K) s (kJ/kg K) (^4433) CondensationCondensation ThrottlingThrottling ...

REFRIGERATION CYCLES 749 dharm \M-therm\Th14-3.pm5 T s CondensationCondensation ThrottlingThrottling WW CompressionCompression R ...

750 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-3.pm5 (ii) The comparison between centrifugal and reciprocating compressors : ...

REFRIGERATION CYCLES 751 dharm \M-therm\Th14-3.pm5 sub-cooled and it enters at 22°C in the expansion valve. The vapour is superh ...

752 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-3.pm5 (i)The C.O.P. of the cycle. (ii)The refrigerating capacity and the comp ...

REFRIGERATION CYCLES 753 dharm \M-therm\Th14-3.pm5 Example 14.19. A Freon-12 refrigerator producing a cooling effect of 20 kJ/s ...

754 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-3.pm5 or ln T 3 313 F HG I KJ = 0 7082 0 682 0 747 .. . − = 0.03507 or T (^3) ...

REFRIGERATION CYCLES 755 dharm \M-therm\Th14-3.pm5 35°C 3 ′ 3 –10°C^2 Evap. Cond. Comp. Th. 4 ′ s 263 308 T(K) 1 303 4 Fig. 14.3 ...

756 ENGINEERING THERMODYNAMICS dharm \M-therm\Th14-3.pm5 Example 14.21. A refrigeration cylce uses Freon-12 as the working fluid ...

REFRIGERATION CYCLES 757 dharm \M-therm\Th14-3.pm5 Compressor inlet : h 2 = 183.2 kJ/kg v 2 = 0.0767 m^3 /kg Compressor discharg ...