Power saving

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How could we save power inour building, and how could the architecte design it

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Power saving

  1. 1. Save power, Save money, and Save lives
  2. 2. Table of Content• Why should we built Sustainable Buildings?• Power consumption sectors.• Prerequisite building studies.• Power saving techniques.
  3. 3. Why should we built Sustainable Buildings? Why do we need energy saving?
  4. 4. Why should we built Sustainable Buildings? Why do we need energy saving?:• Building consume approximately 39% of the energy and 74% of the electricity annually in USA.• Coal and Oil are the most common source of energy used in building, these fuels are finite resources.• The process of extraction and consuming energy from fossil fuels causes: air and water pollution, land degradation, solid waste generation, and greenhouse gas emissions.
  5. 5. Why should we built Sustainable Buildings? Why do we need energy saving?:• Other green source energy, also carry environmental costs; Hydropower for example, alter aquatic ecosystem and harm endangered species.• Building achieve any level of Green building certification; at a minimum, perform better than any other building.
  6. 6. • Why should we built Sustainable Buildings?• Power consumption sectors.• Prerequisite building studies.• Power saving techniques.
  7. 7. Power consumption sectors• Together, the commercial, residential and public sectors account for 30% of electricity consumption.• Residential consumption is estimated to be twice that of commercial.
  8. 8. Power consumption sectors The barriers to energy efficiency in developing countries namely:• Consumers are not familiar with energy- efficient products.• Many energy-efficient products, are not widely available.• Building contractors, and architectural & Engineering firms, are not familiar with the basic techniques which could improve the energy efficiency of the building.
  9. 9. Power consumption sectors Residential Electricity Consumption by End UseSource: EIA, U.S. Household Electricity Reports, Table US-1, 2005
  10. 10. Power consumption sectors Commercial Sector Electricity Consumption by End UseSource: EIA, Commercial Buildings Energy Consumption Survey (CBECS), Table E5A, 2008
  11. 11. Power consumption sectors The major electricity loads are from:• HVAC and Ventilation.• Lighting.• Heating and water heating
  12. 12. • Why should we built Sustainable Buildings?• Power consumption sectors.• Prerequisite building studies.• Power saving techniques.
  13. 13. Building design studies• Green building should reduce the amount of energy required for building operation.• The energy performance of a building depends on its design.• Its massing and orientation, building envelop and insulation, and lighting system.“improved energy performance results in lower operating costs.”
  14. 14. Building design studies Building form and orientation:• The sun is higher in summer and lower in winter sky.• Building should capture free heating in winter, and reject the heat in summer.
  15. 15. Building design studies Building form and orientation:• In the concept phase, try more than one orientation with simulation’s software.• If changing building orientation isn’t applicable, use building shape ideas.
  16. 16. Building design studies Building envelop and insulation:• Brick wall air cavity will significantly reduce heat ingress.• Insulated walls. (could be: Extruded polystyrene, glass-wool, … etc.)
  17. 17. Building design studies Building envelop and insulation:• Double skin, in case of structure glazing skin.• Select high performance glazing with low U-value, low shading coefficient & high VLT ( visual light transmittance).
  18. 18. Building design studies Building envelop and insulation:• Insulated or planted roof (heat ingress through the roof can be as high as 12-15%).• Consider shading devices for window opening.
  19. 19. Building design studies Natural lighting and view:• Outdoor environment have been proven to increase occupant productivity and comfort.• Daylight reduces the need for electric lighting for building interior.
  20. 20. Building design studies Natural lighting and view:• A well-designed daylight building is estimated to reduce light energy use by 50% to 80%.• Glazing can increase initial costs for a project and can lead to excessive heat gain if not designed properly.
  21. 21. • Why should we built Sustainable Buildings?• Power consumption sectors.• Prerequisite building studies.• Power saving techniques.
  22. 22. Power saving techniques Underground Geothermal pipes:• Geothermal heat pump can provide space heating and air conditioning.• These systems use a heat pump to transfer heat from the ground to the application.• Geothermal heat pump could work as closed loop circulate a carrier fluid through pipes buried in the ground or ground water
  23. 23. Power saving techniques Solar heating and water heating (Solar Combisystem):• A collector, often fastened to a roof or a wall facing the sun, heats working fluid that is pumped through it.• Which delivers heat to the tank through a heat exchanger.• Heat is stored in a hot water storage tank for most of the year, in winter, a gas or electric booster is normally used to heat the water.
  24. 24. Power saving techniques Under floor air distribution (UFAD):• UFAD systems operate at much lower design pressure, and wormer temperature, than traditional ducted overhead system.• Use the open space between concrete slab and raised floor.• Reduce the fan horsepower on the mechanical equipment.
  25. 25. Power saving techniques LED Light bulbs:• LED: Light-Emitting Diodes.• Lighting output is smaller than incandescent, therefore often use multiple diodes together.• Robust , where most other light source are fragile.• LED lamps offer long service life and high energy efficiency.• Incandescent bulbs have a typical life of 1,000 hours, compact fluorescents about 8,000 hours, LED offer lifespans of 30,000 or more hours
  26. 26. Power saving techniques Daylight harvesting:• Daylight harvesting systems are typically designed to maintain a minimum recommended light level.• Photosensors (light level sensor) are used to integrate an electric lighting system with a day-lighting to operate only when day-lighting is insufficient.• lighting control system, uses an automated device, and/or motion sensors, to shutting off or dimming lighting fixtures as appropriate.
  27. 27. • Why should we built Sustainable Buildings?• How could we define Green Building?• Power consumption sectors.• Prerequisite building studies.• Power saving techniques.
  28. 28. Thank You ?

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