User Tools

Site Tools


basics:efficiency_vs._performance

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
basics:efficiency_vs._performance [2015/03/08 12:24]
wolfgangfeist@googlemail.com [See also]
basics:efficiency_vs._performance [2019/01/31 10:57] (current)
cblagojevic
Line 16: Line 16:
 \\ \\
   * Such values characterising efficiency are not "​efficiency factors"​ - they are values with a dimension.   * Such values characterising efficiency are not "​efficiency factors"​ - they are values with a dimension.
 +
   * It is not possible to introduce an efficiency factor instead of this because most activities requiring the use of energy do not have the dimension of energy.\\   * It is not possible to introduce an efficiency factor instead of this because most activities requiring the use of energy do not have the dimension of energy.\\
 +
   * And there is no "​minimum amount of energy required based on physical reasons"​ for providing a benefit; the contrary assumption is also a widespread misconception – the "​minimum amount of energy required"​ is zero in most cases (or an extremely small value greater than zero).\\   * And there is no "​minimum amount of energy required based on physical reasons"​ for providing a benefit; the contrary assumption is also a widespread misconception – the "​minimum amount of energy required"​ is zero in most cases (or an extremely small value greater than zero).\\
 \\ \\
Line 27: Line 29:
  
   * Heat storage tanks can be insulated more efficiently,​ thereby considerably reducing the energy consumption for maintaining the temperature (the thermos-flask principle).   * Heat storage tanks can be insulated more efficiently,​ thereby considerably reducing the energy consumption for maintaining the temperature (the thermos-flask principle).
 +
   * The same applies for heat distribution pipes (particularly domestic hot water and circulation pipes).   * The same applies for heat distribution pipes (particularly domestic hot water and circulation pipes).
 +
   * Heat can be recovered from waste water from washing and showering.   * Heat can be recovered from waste water from washing and showering.
 +
   * Insulation which prevents heat losses is just as effective for cooling performance (see __**//Fig 1//**__).   * Insulation which prevents heat losses is just as effective for cooling performance (see __**//Fig 1//**__).
 +
   * By using heat recovery, energy can also be used more efficiently for industrial processes. ​ An example of that is a counter-flow firing kiln: (hot!) fired goods approach the as yet cold, unfired goods along the production lines.   * By using heat recovery, energy can also be used more efficiently for industrial processes. ​ An example of that is a counter-flow firing kiln: (hot!) fired goods approach the as yet cold, unfired goods along the production lines.
 +
   * Improved efficiency of materials and recycling of energy-intensively produced materials can also reduce the energy consumption.\\   * Improved efficiency of materials and recycling of energy-intensively produced materials can also reduce the energy consumption.\\
 \\ \\
Line 39: Line 46:
  
   * Warm home: non-equilibrium state, "​higher indoor temperature"​ in comparison with "cold surroundings"​. Intelligent process management: all types of thermal protection. Practical example: Passive House.   * Warm home: non-equilibrium state, "​higher indoor temperature"​ in comparison with "cold surroundings"​. Intelligent process management: all types of thermal protection. Practical example: Passive House.
 +
   * Climatised home: non-equilibrium state, "cool indoor temperature/​lower humidity "in comparison with "hot surroundings/​high humidity"​. Intelligent process management: thermal protection, heat and moisture recovery. Practical example: Passive House with a compact unit.   * Climatised home: non-equilibrium state, "cool indoor temperature/​lower humidity "in comparison with "hot surroundings/​high humidity"​. Intelligent process management: thermal protection, heat and moisture recovery. Practical example: Passive House with a compact unit.
 +
   * Cooling chain: non-equilibrium state, "​cooler temperature in the cooling space" in contrast with "​warmer surroundings/​high humidity"​. Intelligent process management: thermal protection. Practical example: vacuum-insulated cooling space.   * Cooling chain: non-equilibrium state, "​cooler temperature in the cooling space" in contrast with "​warmer surroundings/​high humidity"​. Intelligent process management: thermal protection. Practical example: vacuum-insulated cooling space.
 +
   * Transportation (see __**//Fig 2//**__): non-equilibrium state, " movement with friction"​. Intelligent process management: reduction in friction, recovery of braking energy. ​ Practical example: Hypercar, 1.5 litre car.\\   * Transportation (see __**//Fig 2//**__): non-equilibrium state, " movement with friction"​. Intelligent process management: reduction in friction, recovery of braking energy. ​ Practical example: Hypercar, 1.5 litre car.\\
 \\ \\
basics/efficiency_vs._performance.txt · Last modified: 2019/01/31 10:57 by cblagojevic