QUESTION 14An industrial refrigeratot uses (NH3) Ammonia, and a reciprocating compressor. At the begining of compressionthe refrigerant is dry staurated at 1bar and operates adibatically with index 1.3 and copression ratio 20. At thefinal stage, the fluid is saturated vapour. Using the prescribed property table, the specific volume aftercompression is(to 4 d.p) in(unit symbol). Thevolumetric ratio is(to 4.d.p) and the final specific volume is(to 2 d.p.). The work done on the refrigerant during the process is(to 1 d.p in kilo of unit symbol). The initial specific enthalpy of dry saturated(2 d.p) in(kilo of unit symbol), while thatrefrigrant isof after compression is(1 d.p) in(kilo of unitsymbol) and the initial specific internal energy of dry saturated refrigrant is(2 d.p)in(kilo of unit symbol) then(3 d.p) in(kilo of unit symbol) after compression. The heat transferd per unit mass to the orfrom the the cylinder walls during the process is(to 2 d.p. in kilo of unit symbol).m3may be typed in as m^3.

From property table At 1bar dry saturatedT1=-33.600Ch1 =1398.41 kJ/kgu1=1284.61 kJ/kgv1=1.1381m3/kg…

Answered: Ammonia,

Engineering

Mechanical Engineering

Ammonia,

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter3: Refrigeration And Refrigerants

Section: Chapter Questions

Problem 31RQ: Define a near-azeotropic refrigerant blend, and give twoexamples.

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