Thermal expansion coefficient for liquids.

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SUMMARY

The discussion centers on identifying a liquid with a high thermal expansion coefficient suitable for use as a working fluid in a Stirling engine. Pentane is highlighted as a potential candidate, while acetaldehyde is also mentioned due to its low boiling point of 20.6°C. Participants express interest in exploring mixtures of liquids that may enhance thermal properties. The conversation emphasizes the importance of selecting the right fluid to optimize efficiency and cost-effectiveness in energy cycles.

PREREQUISITES
  • Understanding of thermal expansion coefficients in liquids
  • Basic knowledge of Stirling engine mechanics
  • Familiarity with fluid dynamics and thermodynamics
  • Experience with energy cycle systems
NEXT STEPS
  • Research the thermal expansion coefficients of various liquids, including pentane and acetaldehyde
  • Explore the properties of liquid mixtures that enhance thermal performance
  • Study the design and efficiency of Stirling engines
  • Investigate alternative working fluids for energy cycles beyond traditional options
USEFUL FOR

Engineers, students in mechanical engineering, and researchers interested in thermodynamic systems and energy efficiency solutions.

Geir Onsoyen
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I am looking for a liquid with a high expansion coefficient. This liquid should act as a working fluid in a energy cycle based on a system where the working fluid does not change phase from liquid to gas.

So far I have found pentane as the most suitable liquid - but I would like to know if there are people with experience / knowledge that can help me in this case. For instance if there are mixtures of different liquids that have special properties that can be interesting.
 
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i`ve got a doubt

HEY GUYS... I`M COMPLETELY NEW TO THIS FORUM AND AM AN AMATURE... SO BEAR WITH ME IF MY DOUBTS SOUNDS SILLY... BY THE WAY I`M IN MY FRESHMAN YEAR IN INDIA. I WANT TO MAKE A STIRLING ENGINE. PLS DO PROVIDE ME SOME GUIDING WEBSITES OR SUCH... NEXT I HAVE A DOUBT IN IT... IN A STIRLING ENGINE THE LIQUID IS HEATED BY A HEAT SOURCE... NOW MY QUESTION- I NOTICED THAT THE BOILING PT OF ACETALDEHYDE IS AROUND 20.6C.
IF I PUMP LIQUID ACETALDEHYDE AT SOME 15 OR 10C CONDITION AND THEN IF I BRING THE STIRING ENGINE TO THE ROOM TEMP THEN WILL IT WORK WITHOUT AN EXTRA HEAT SOURCE AT THE ROOM TEMPERATURE...?:confused:. OR MAYBE LIKE Geir Onsoyen SAYS MAYBE USING A LIQUID OF HIGH COEFF OF THERMAL EXPANSION, THEN WOULD IT BE WORKING BETTER? AND WILL IT BE EFFECIENT THAN THE COMBUSTION ENGINE IN TERMS OF COSTS TOO OWING TO THE RISING FUEL PRICES?
 

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