Passive-design-and-net-zero-energy-building.pptx

Passive-design-and-net-zero-energy-building.pptx

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  Passive design Passive designis design that takes advantage of the climate to maintain a comfortable indoor climate in the home. Passive design reduces or eliminates the need for auxiliary heating or cooling 1
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  Passive design issues •Major principles • Passive heating • Passive cooling • Hybrid system • Day lighting • Renewable in building 2
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  Passive design means Noauxiliary equipment are required to make the system to function Factors • Orientation • Fenestration (the arrangement of windows) • Shading • Envelop • Day lighting • Thermal mass • Renewable adaptation 3
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  Six major principles 1.Orientation 2. Glazing 3. Thermal mass 4. Insulation 5. Ventilation 6. Zoning 4
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  Passivecooling 1) Reducing coolingload 2) Using passive techniques 3) Improving efficiency of cooling equipment and thermal distribution systems.
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  Reducing coolingloads • Orientationof building • Clustering buildings to provide self shading • High-reflectivity building materials • Increasing insulation • Glazing on windows with a low solar heat gain and a high daylight transmission • Avoiding excessive window area • Utilizing thermal mass
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  Housingmaterials Materials Overall heattransfer co- efficient ,U W/m2 K Outer wall (solid brick, cement sand Plaster and Insulation ) 2.22 Internal wall (brick and cement sand plaster 2.22 Floor (ground ) Solid concrete 0.80 Floors (intermediate ) Solid concrete and plaster board 1.7 Roof (pitched with felt ) 0.6 Window ( wooden frame and single glazed 2.9 Door ( solid timber door) 1.7 Comparatively higher U values
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  Passivetechnique Natural ventilation Evaporative cooling Otherpassive cooling techniques
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  Passivecooling Solar shading Providing thermalmass Stack ventilation by duct or chimney Wind driven ventilation Passive lighting
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  Zero-energy building 10 • Azero-energy building (nZEB), also known as a zero net energy (ZNE) building, is a buildings use with zero net energy consumption and zero carbon emissions annually. • Zero-energy buildings use energy from • grid supply • on-site usually in combination with energy producing technologies such as solar and wind • reducing the overall use of energy with efficient HVAC and lighting technologies
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  Other names 12  near-zeroenergy building  ultra-low energy house  energy-plus buildings The benefits of a ZEB usually are as follows: • Isolation for building owners from future energy price increases • Reduced requirement for energy austerity • Reduced total cost of ownership due to improved energy efficiency • Reduced total net monthly cost of living • Improved reliability: extra cost is minimized for new construction compared to an afterthought Retrofit • Higher resale value as potential owners demand more ZEBs than available supply • Future legislative restrictions, and carbon emission taxes/penalties
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  Zero-energy dwellings 13
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  Zero-energy building characteristics •Advanced HVAC and lighting controls • Smart metering capabilities, allowing central access to real-time utility data • A structured cabling infrastructure with high bandwidth and connectivity • Adaptability to changing technology and tenant needs 14
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  Zero-energy house using PVsystem 15
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  Some smart solutionsto make a zero-energy building 16 1.Decrease the energy requirements for space heating, cooling, and water heating: • Orient the home with smaller walls facing west and include overhangs and porches • Increase foundation, wall, and ceiling insulation • Use low U-value, low-E windows in all climates and low solar heat gain (low SHGC) windows in cooling climates • Seal all holes, cracks, and penetrations through the floor, walls, and ceiling to unconditioned spaces • Install adequate ventilation, especially from kitchens and baths
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  2. Increase theefficiency of the furnace (or heat pump), and the air- conditioner: • Buy as high-efficiency equipment as affordable for the climate • Design the supply and return duct system appropriately and seal tightly using approved tapes or mastic • Where climate-appropriate consider alternative cooling systems such as ventilation only or evaporative coolers • Heat pump 17
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  3. Install asolar hot water preheat system, an efficient backup water heater, and an efficient distribution system: • Consider a parallel, small diameter piping system for the hot water outlets • Install low-flow fixtures • Choose water heating equipment with a high energy factor • Evaluate solar systems 18
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  4. Install efficientlighting fixtures: • Consider permanent fluorescent fixtures in as many locations as possible • Look for the ENERGY STAR compliance 5. Install efficient appliances: • Include the refrigerator, dishwasher, and laundry appliances • Look for the ENERGY STAR compliance • Compare appliance efficiencies 19
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  6. Install aproperly sized photovoltaic system 7. Turn off lights, computers, and appliances when not in use 20
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  1. The concept-passivedesign 2. What do you understand by zero-energy building? 3. Give some simple solutions to make a zero-energy building? 4. Give some advantages and disadvantages of a nZEB? 5. How could encourage the homeowners to get a zero-energy house? 6. What are the characteristics of a zero-energy building? 21 Discuss with peer give your opinion