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Heat and Work: Part 2. Conservation of Energy Heat Engines Second Law of Thermodynamics Energy Efficiency OTEC. Energy in the News. Possible solutions to Energy Problems 1) Smart Buildings and Machines 2) Superconductive Cables 3) Fewer Phantom Loads 4) Distributed Generation

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heat and work part 2
Heat and Work: Part 2
  • Conservation of Energy
  • Heat Engines
  • Second Law of Thermodynamics
  • Energy Efficiency
  • OTEC
energy in the news
Energy in the News
  • Possible solutions to Energy Problems
    • 1) Smart Buildings and Machines
    • 2) Superconductive Cables
    • 3) Fewer Phantom Loads
    • 4) Distributed Generation
      • A) Solar Cells
      • B) Wind
      • C) Diesel Generators
      • D) Microturbines
      • E) Fuel Cells
heat loss
Heat Loss
  • Hypothermia-what causes it? Basic physics
  • Lakes-ice and summer warmth. Why retained?
  • Space blankets-very thin-what do they do?
  • Why cold when standing near a window in winter?
  • Why warm near a fire?
vapor or rankine cycle
Vapor or Rankine Cycle
  • Steam engines
  • Heat pumps
gas cycle
Gas Cycle
  • Automobiles (Internal Combustion)
  • Jet Engines (External Combustion)
  • Where is the fuel burned?
  • What does the force from burning move?
practicalities of otec
Practicalities of OTEC
  • Maximum Efficiency (Carnot efficiency)
  • =100% * ( Thigh-Tlow)/Thigh
  • T in degrees Kelvin
  • What is more efficient?
  • Thermal engines with large or small temperature differences?
  • When will it be 100% efficient?
second law of thermodynamics
Second Law of Thermodynamics
  • Entropy (Disorder) always increases Unless energy is added
  • Examples:
  • Kids room
  • Spontaneous heat flow (Hot to Cold yes, never cold to hot)
  • Waste Heat is always present
ideal case
Ideal Case
  • A completely reversible process
  • Do common heat engines use reversible processes, why or why not?