Cascade system Design

[ssk7899]

Any one can help me designing for two stage cascade system .
Required Capacity 10 TR
Required Temperature -70 Deg c
Ambient Temperature +40 deg c

I like to use screw compressor of Bitzer / Frascold .
I stage 75 HP
II Stage 60 HP.

What Refrigerants to be used?
What is the capacity of Intermediate Condenser?
What Oil to be Used?
SS evaporator or Copper Tube ?

Any one can help me designing for two stage cascade system .
Required Capacity 10 TR
Required Temperature -70 Deg c
Ambient Temperature +40 deg c

I like to use screw compressor of Bitzer / Frascold .
I stage 75 HP
II Stage 60 HP.

What Refrigerants to be used?
What is the capacity of Intermediate Condenser?
What Oil to be Used?
SS evaporator or Copper Tube ?

Any one can help me designing for two stage cascade system .
Required Capacity 10 TR
Required Temperature -70 Deg c
Ambient Temperature +40 deg c

I like to use screw compressor of Bitzer / Frascold .
I stage 75 HP
II Stage 60 HP.

What Refrigerants to be used?
What is the capacity of Intermediate Condenser?
What Oil to be Used?
SS evaporator or Copper Tube ?