Hi all,
The MYCOM V series manual states
Vi = Volume of suction refrigerant when compression begins
Volume of same quantity of refrigerant at discharge port
In other words, Vi is the ratio of the groove volume after competition of suction to the volume when the
discharge port opens.
Conventional screw compressors have three fixed Vi values, that is 2.63, 3.65 and 5.80, termed “L port,” “M port” and “H port,” respectively.
The relationships are:
Vi = (Pd/Ps)1/k or Vik = Pd/Ps
For calculation purposes could I not use the Specific Volumes at the desired conditions eg:
Ammonia Freezer
-20degC = 0.6237
+30degC = 0.1106
VI = 5.6
Ammonia Water Chiller
0degC = 0.2895
+30degC = 0.1106
VI = 2.6