Heating a Heat Engine - Efficiency Calculation

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SUMMARY

This discussion focuses on measuring the efficiency of a heat engine, specifically a Stirling engine. The key challenges identified include determining the appropriate method to measure heat input and deciding whether to maintain a constant temperature or a constant heat energy input. James suggests using calorimetry to assess usable energy, emphasizing the importance of the temperature difference between the heat source and heat sink for accurate efficiency calculations.

PREREQUISITES
  • Understanding of heat engine principles
  • Familiarity with Stirling engine operation
  • Knowledge of calorimetry techniques
  • Basic thermodynamics concepts
NEXT STEPS
  • Research calorimetry methods for measuring heat input
  • Explore the principles of Stirling engine efficiency calculations
  • Learn about maintaining constant temperature vs. constant heat energy input
  • Investigate the relationship between temperature differentials and energy output
USEFUL FOR

Engineers, physicists, and students involved in thermodynamics, heat engine design, and efficiency optimization will benefit from this discussion.

Tawaffles
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Hi.

Im trying to measure the efficiency of a heat engine. I therefore need to work out what the input energy is to the heat engine.

I have two problems. Firstly, how should I measure the heat going into the stirling rather than the heat coming out of the heater. Is it ok to measure the temperature of the heat engine as an indication of the heat input energy?

Secondly, should I be trying to put in a contstant temperature, or constant heat energy? So, should I be saying, I need my heater to keep it at 18C or should I say, I need to be putting 5KW into into constantly?

Im trying to compare the mechanical output to the heat input.

James
 
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Maybe try something with calorimetry.
 
The actual amount of usable energy you should be able to use with a heat engine should be the related to the difference in temperature between your heat source and your heat sink.
 

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