Cryogenic  Systems  

2  

LHP  and  CLHP  Opera6on  

Qcond = mλ [(x0 - x1) + (x2 - x3) + (x4 - x5)]

Reservoir  Evaporator  

Condenser  

3  

x  

4  

Tes6ng  of  a  Cryogenic  LHP  

Demonstra6on  Unit  

5  

Experiment  Setup  &  Tes6ng  

6  

7  

Experiment  Setup  &  Tes6ng  

8  

Cooldown  

9  

Startup  

Startup  

10  

Steady  State  

11  

Capillary  Limit  &  Total  Heat  Capacity  

12  

Quick  Response  

13  

14  

Summary  

14  

Acknowledgements  Funding  for  this  test  program  was  provided  by  NASA  Engineering  and  Safety  

Center’s  Passive  Thermal  and  Propulsion  Technical  Discipline  Teams.  The  Technical  Monitors  were  Messrs  Steven  Rickman  and  the  late  Roberto  Garcia.    

Thanks  also  go  to  Dr.  Triem  Hoang  and  Ms.  Tamara  O’Connell  for  their  valuable  advices  during  the  course  of  this  investigation.  

Personal  thanks  to  Dr.  Jentung  Ku  and  Franklin  Robinson,  as  well  as  the  Thermal  Lab  Crew  of  building  4  

   JWST  Image:    

http://www.nasa.gov/centers/goddard/images/content/650171main_013530_white_med.jpg  Dewar  Image:    

http://appel.nasa.gov/knowledge-­‐sharing/publications/cobe-­‐html/  

Radiator  Image:    

http://www.solaripedia.com/13/128/1174/international_space_station_photovoltaics.html    

 15