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Diffstat (limited to '167/CH5/EX5.8/ex8.sce')
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1 files changed, 21 insertions, 0 deletions
diff --git a/167/CH5/EX5.8/ex8.sce b/167/CH5/EX5.8/ex8.sce new file mode 100755 index 000000000..2b1dbeee6 --- /dev/null +++ b/167/CH5/EX5.8/ex8.sce @@ -0,0 +1,21 @@ +//example 8
+// expansion of refrigant 134-a in refrigerator
+clear
+clc
+disp('Refrigerant-134a that enters a capillary tube as saturated liquid.Therefore,from table of refrigerant-134a ')
+P1=0.8 // initial pressure in MPa
+T1=31.31 //initial temp. in Celsius
+h1=95.47 //initial specific enthalpy in kJ/kg
+disp('Flow through a capillary tube is a throttling process. Thus, the enthalpy of the refrigerant remains constant')
+h2=h1 //final specific enthalpy
+P2=0.12 //final pressure in MPa
+T2=-22.32 //final temp. in Celsius
+hf=22.49 // in kJ/kg
+hg=236.97 // in kJ/kg
+hfg=hg-hf //in kJ/kg
+disp('Obviously hf<h2<hg thus, the refrigerant exists as a saturated mixture at the exit state')
+disp('Thus quality at this state is')
+x=(h2-hf)/hfg
+dT=T2-T1 //in Celsius
+printf("\n The quality of the refrigerant at the final state is = %.3f. \n",x);
+printf("\n The temp. drop during this process is = %.2f C. \n",dT);
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