Calculating Refrigerant Gas

[alimran]

Can somebody tell me how to calculate the requirement of refrigerant gas in chillers. I have the following details in hand;

Building 44
Unit No 1 - (ACCU-99-GC-2002B)
(AHU-99-GA-2026B)
No of Circuits – 4 No’s
Pipe Length – 4.5 m
Suction Pipe Diameter – 54 mm
Liquid Pipe Diameter – 22.2 mm
Unit Charge – 36 kg per Circuit


Unit No 2 - (ACCU-99-GC-2002A)
(AHU-99-GA-2026A)
No of Circuits – 4 No’s
Pipe Length – 11.5 m
Suction Pipe Diameter – 54 mm
Liquid Pipe Diameter – 22.2 mm
Unit Charge – 36 kg per Circuit


Building 158
Unit No 1 - (ACCU-99-GC-2003B)
(AHU-99-GA-2027B)
No of Circuits – 4 No’s
Pipe Length – 55 m
Suction Pipe Diameter – 80 mm
Liquid Pipe Diameter – 35 mm
Unit Charge – 36 kg per Circuit


Unit No 2 - (ACCU-99-GC-2003A)
(AHU-99-GA-2027A)
No of Circuits – 4 No’s
Pipe Length – 47 m
Suction Pipe Diameter – 80 mm
Liquid Pipe Diameter – 35 mm
Unit Charge – 36 kg per Circuit

Type of Refrigerant – R134A

[Brian_UK]

You have given the requirements in the data above..?

Refrigerant type and quantity, what else is there to know?