Finding mass of working fluid needed in a thermo cycle

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SUMMARY

The discussion focuses on estimating the total mass of working fluid required for a refrigeration cycle in a portable life support system (PLSS) for space suits. Key parameters such as mass flow rate and RPM are provided, and the calculation involves integrating the fluid density and tubing dimensions along the length of the system. The need to account for thermal effects and flexure in the tubing design is emphasized, particularly when considering primary and secondary circuits in the refrigeration setup.

PREREQUISITES
  • Understanding of refrigeration cycle principles
  • Knowledge of fluid dynamics and mass flow rate calculations
  • Familiarity with thermal effects in closed systems
  • Basic calculus for integration of fluid properties
NEXT STEPS
  • Research methods for calculating mass flow rate in refrigeration systems
  • Learn about the integration of fluid density in tubing design
  • Explore thermal management techniques in portable life support systems
  • Investigate the design considerations for primary and secondary refrigeration circuits
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Engineers and designers working on thermal systems, aerospace professionals involved in life support systems, and anyone involved in the design and optimization of refrigeration cycles in confined environments.

FQVBSina_Jesse
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This question is related to a project.

I have the mass flow rate, RPM, and all other related information regarding a refrigeration cycle, does anyone have an idea on how can I estimate the total amount of working fluid I need to put into the device?

In case this comes up: the device is going to be a cooling system put in the space suit/portable life support system (PLSS) which involves long tubing around the cooling garment that circulates the cool fluid and a few more tubing plus a compressor and heat exchanger in the PLSS.

Thanks a lot!
 
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You'll need to integrate ##\ \rho\; {\pi d^2 \over 4 } dl \ ## along the length of the tubing :smile:
 
Do you have primary and secondary circuits for the refrigeration or just one circuit ?

In any case you need to allow for thermal effects and flexure .
 

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