4 Stage Cascade by august123

[august123]

Last October I started planning my new cascade.
First I wanted to build an 3 Stager, later I decided to build a "really" 4 stage cascade with sould hold about 200-250W at -160°C. I hope to come in this regions with this build, we will see.

Main Compressors are Danfoss/ Maneurop Reciprocating Compressors, I get them for good prices.
Everything is mounted on an steel construction, weight of all together is about 200kg I think Dimensions are 1,3m x 0,75m

Thread with the full story: ALL PICTURES + ALL Specs
http://www.extremecooling.net/index/...ic.php?31681.0


Technical Data:

Stage 1

Maneurop/ Danfoss MT50 Compressor 14,9m³/h /85ccm
4,1HP
400V 3~ three phase current
Two Condensors, together about 7.000 Watts Capacity, even enough for hot summer days
Expansion Valve Danfoss TS2 with external equalized pressure
Danfoss OUB4 Oil Seperator painted red
Penn High Pressure Cut- OFF Switch
3,4L reciever
Emkarate RL32h Oil
Refrigerant: R507A


Stage 2

Maneurop MTZ40 Compressor 11,8m³/h /67ccm
3,3HP
400V 3~ three phase current
Plate Heat Exchanger as Condensor: 30 plates
Evaporator: 16 Plates
Expansion Valve Danfoss TEB2 with external equalized pressure
Danfoss OUB4 Oil Seperator painted red
Penn High Pressure Cut- OFF Switch
little eciever
Expansion tank
Refrigerant: R23


Stage 3

Mitsubishi NHJ41VMD Rotary Compressor (7,1m3/h) ~3HP
selfmade TXV Valve
ESK OS-10 -12 Oilseperator
Penn High Pressure Cut- OFF Switch
Expansion Tank
Refrigerant: R14

Stage 4

Rotary Compressor “QX-12”
about 18ccm

Danfoss OUB-1 Oilsep + Temprite 340 Series
huge expansion ank
Penn High Pressure Cut- OFF Switch
Refrigerant R50
4m flexline + CPU Evap


Total electrical Motor Power: ~ 11,5HP
Total power consumption: ~ 6000 Watts at 400V/ 3~




After you read all the Specs, you may want to see pictures of the "Monster":

Planning the Unit in 3D CAD:










Plate Heat Exchangers, 30 plates for first, 16 second and 12 for third stage.






Refrigerants and Oil for the Compressors:






















These days, 3rd Stage is completed and is running just fine. I will start with the last stage in some weeks, need to buy some stuff.










On this picture are the temps with actual tuning, freqency converter for extra power in first stage. T1 is condensing Temp from R23, T2 is evaporating Temp, T3 is condensing Temp R14 and T4 is the evaporating temp at the plate HX.
(need to adjust TXV in second Stage a little bit more, to get compressor ice-free)




two of the electronic temperatur controllers, they start each stage automatic when temperatur is deep enough. Need to make nice control panel for them and the Build- In Manometers.



Hope you enjoy it

august