1. EXTRACTION OF HIGH VOLUME CRYOGENIC HEAT LOAD
Ronald den Heijer, Tushar Bhowmick
ICEC 2016
6-11 January 2016

2. Contents Cryogenic closed loop Closed loop cooling systems @ IPR
IPR Liquid Nitrogen 80K Boosting System
IPR 80K Helium Gas Supply system
Conclusion

3. Cryogenic Closed Loop conditioning cold source transferring recycling
using (application)
recycling
cold source

4. Liquid Nitrogen 80K Boosting System
Cooling the thermal shields of SST-1 Tokamak Reactor:
Cold source : liquid nitrogen
Coolant: Subcooled liquid nitrogen in a closed loop
Net heat load : 20kW
LN2 temperature inlet : 80K
outlet : max 90K
High efficiency LN2 pumps : 30%
Available floor space : 2,25m*2,25m

5. P&ID Liquid Nitrogen 80K Boosting System

6. Liquid Nitrogen 80K Boosting System @ IPR

7. Liquid Nitrogen 80K Boosting System
Installed and Commissioned November 2014
Results:
Net heat load during testing: >20 kW
LN2 temperature: inlet <80K
outlet <90K
LN2 pressure: Mpa (g)
Flow rate subcooled LN2: 100 lpm
Pump efficiency: 32%

8. 80K Helium Gas Supply System @ IPR
Cooling Cryo-adsortpion Cryopump:
Cold Source : Bulk Liquid Nitrogen
Helium gas as coolant in a closed loop
He temperature inlet pump : 80 K
outlet pump : 85 K
Net heat load : 5.5 kW
Helium flow rate : 210 g/s
Operational He pressure : 16 Mpa (a)
Net pressure drop at 210 g/s : MPa
High efficiency pumps : approx. 50 %

9. PFD 80K Helium Gas Supply System

10. YETI gas circulator: design requirements
Helium gas flow : 210g/s
Helium pressure : 1.65 Mpa (a)
Pressure build up : MPa
Efficiency : 50%

11. YETI design: Flow

12. YETI Design: Dynamics

13. YETI Design: Thermal and Contraction

14. YETI CIRCULATOR

15. YETI Performance

16. 80K Helium Gas Supply System (NL)

17. 80K Helium Gas Supply System (NL)

18. 80K Helium Gas Supply System @ IPR Results:
Installed and commissioned December 2015
Helium gas in a closed loop 1.65 MPa (a)
He temp. inlet Cryopump : <80 K
outlet : <85 K
Net heat load : 5.5 kW
Helium flow rate : 210 g/s
Net pressure drop at 210 g/s : 0.082>0.055 Mpa
Efficiency pumps : approx 50 %

19. Conclusion (1) Liquid nitrogen 80K Boosting System:
The Liquid Nitrogen 80K Boosting System performs as per requirement of IPR or better.
In steady state a heat load of >20 80K was removed successfully
The overall system efficiency is 89%

20. Conclusion (2) 80K Helium Gas Supply System:
The 80K Helium Gas Supply system performs as per requirements of IPR or better
In steady state the heat load of 80K was successfully removed
The allowable pressure drop is higher than required: MPa instead of 0.05 MPa
The system efficiency is 61%

21. EXTRACTION OF HIGH VOLUME CRYOGENIC LOAD made by CryoZone

22. Questions and Queries are most welcome
Thank You
Questions and Queries are most welcome