文档介绍：MIT OpenCourseWare
The Physics of Energy
Fall 2009
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Introduction: Why now? Qulaity and mixed phase
Thermodynamics of heat extraction Thermo for flowing fluids
Phase change in pure substances pression cycle I
Lecture 10
Phase Change Energy Conversion I
September 30, 2009
Lecture 10: Phase change energy conversion I
2
Introduction: Why now? Qulaity and mixed phase
Thermodynamics of heat extraction Thermo for flowing fluids
Phase change in pure substances pression cycle I
•
Why this now?
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Thermodynamics Thermodynamics of heatof heat extraction extraction Part I
•
Phase Phase change change in purein pure substances substances
•
The The vapor pression cycle: cycle: heat heat pumps, pumps,
refrigeration, air conditioners }
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The The Rankine Rankine steam steam cycle cycle and and steam steam turbines turbines Part II
•
Some Some implementations implementations of theof the Rankine Rankine cycle cycle }
Lecture 10: Phase change energy conversion I
3
Introduction: Why now? Qulaity and mixed phase
Thermodynamics of heat extraction Thermo for flowing fluids
Phase change in pure substances pression cycle I
Household energy use
Several aims
Explain how simple thermodynamic cycles can
• Image removed due to copyright restrictions.
move heat from low to high temperatures
Similar graph can be found on web page
teElements/images/
Explain why cycles that make a fluid change EnergyMgt/
•
from vapor to liquid and back dominate
practical applications, and how they work
Construct and evaluate the dominant cooling
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(“pression”) and power (“Rankine”) Kitchen energy use
cycles in use today
Heat extraction devices are everywhere
! Household air conditioning — %
of all U. S. energy use (2001)
! Household refrigeration — %
! Commer