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R-134a vapor enters into a turbine at 250 psia and 175°F. The temperature of R-134a is reduced to 20°F in this turbine while its specific entropy remains constant. Determine the change in the enthalpy
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R-134a vapor enters into a turbine at 250 psia and 175°F. The temperature of R-134a is reduced to 20°F in this turbine while its specific entropy remains constant. Determine the change in the enthalpy of R-134a as it passes through the turbine.

User Marl
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1 Answer

4 votes

Answer:

Δ enthalpy = -23 Btu/Ibm

Step-by-step explanation:

Given data:

Pressure ( P1 ) = 250 psi

Initial Temperature ( T1 ) = 175°F

Final temperature ( T2 ) = 20°F

Calculate the change in the enthalpy of R-134a

From R-134 table

h1 = 129.85 Btu/Ibm

s1 = 0.23281 Btu/Ibm.R

note : entropy is constant

hence ; s1 = s2

by interpolation ; h2 = 106.95

Δ enthalpy = h2 - h1

= ( 106.95 - 129.85 ) = -23 Btu/Ibm

User Varghese
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