Case of Net Zero Energy Building all over the world
Many are skeptical about the reality of Net Zero Energy Building Design. As such I though it is best to show you the buildings which have achieved the Net Zero Energy Building Design status. This Net Zero Energy Building Design approaches and strategies has become a trend world wide as the movement is catching on quire rapidly. Here there are 5 cases of the strategies adopted world over from Indonesia, Malaysia to the US.
Case 1

Apartment in NY ( read on Apartment in NY )
The Apartment had 48 apartments of an gross area of 53,000-sq-ft
Approaches to Net Zero Energy Designs strategies(The strategies adopted contrived a 90% reduction of consumption of energy);
• wall and roof insulation,
• window glass with low-e coatings and insulated frames,
• shading of building
• Reduction of infiltration through building skin
• Compartmentalization of ventilation spaces provided the best controlled fresh air into the apartment spaces.
• A high-performance air-source heat pump was introduced as a heating plus cooling system.
• One VRF outdoor condensing unit is recommended per apartment
• Domestic hot water included heat recovery from the drain as a pre-heater and recovering the waste heat from the VRF system by using a heat exchanger.
• Improved zone temperature control and substantially reduced energy usage
• Higher-efficiency cooling/heating
• Improved tenant comfort; potential to sub meter heating, cooling, and DHW
• Resiliency (no boiler on the lower floors); and most important, dramatically lower carbon emissions.
• Lighting strategies include low lighting power density (LPD) design solutions while maintaining acceptable levels of illumination. Where applicable, occupancy sensors and bi-level lighting controls are evaluated. The most efficient available appliances are considered for apartments and common areas.
• Solar photovoltaic (PV) arrays
• High performing Appliances s such as : refrigerators, Clothes dryer, Television and TV set-top (cable) boxes

 

Case 2

The Bullitt Center in Seattle, Washington, 6 storey Office block of approx 60,000ft2

Approaches to Net Zero Energy Building Design strategies:
• Day lighting harvesting
• geothermal heating and cooling,
• Operable windows and other measures to increase its energy efficiency.
• increase the height of each floor of the building to allow for improved day lighting further into the core of the structure,
• Reducing the need for heat-generating light fixtures.
• Geothermal and radiant floor heating & cooling are used to efficiently moderate temperatures
• The BMS controls the heating & cooling , the window shades, operable windows , composting, water treatment, and ventilation.
• photo voltaic used to create renewable energy
Case 3
Pusat Tenaga Malaysia Zero Energy Office Building ( PTM ZEO)

The area of building was 43,000sq ft averaging BEI of 35kW/sqm.year with a reduction of 80% of the national average BEI
It is the world’s first net zero energy commercial office building.

Approaches to Net Zero Energy Designs strategies :
• Double-pane windows reducing heat gain and provide day light harvesting.
• Energy efficient building envelope.
• Day lighting with controls of blinds and light shelves.
• High efficiency pumps and fans.
• Desiccant heat wheel DE-humidification.
• Energy efficient office equipment.
• Concrete slab thermal cooling and storage.
• Wet/ trickling water night cooling roof.
• Phase change thermal storage.
• photo voltaic used to create renewable energy
Case 4

NREL Building, USA

The floor area is about Area-360,000sq ft , energy use intensity target of the new building is 35 kBtu/SF/year, (110kWh/m2/year)
Approaches to Net Zero Energy Building Designs strategies :
The largest commercial Net-Zero Energy Building in the United States
Energy performance for the facility is 50% better than ASHRAE 90.1 standards.
• orientation of the building to minimize heat gain and
• maximize day lighting harvesting
• operable triple-glazed windows,
• hydronic heating and cooling using thermal slabs, and
• demand-controlled outside air system with energy recovery.
• a combination of evaporative cooling,
• outside air ventilation,
• waste heat capture
• efficient servers
• The data center has a remarkable power usage effectiveness (PUE) rating of 1.12 compared to a national average of 1.91
• photo voltaic used to create renewable energy 2.5 MW solar PV rooftop and parking canopy
Case 5

Pertamina Building
There Pertamina Building , a 99 storey office tower will be a Net Zero Energy Building

Approaches to Net Zero Energy Building Designs strategies :
• A ‘wind funnel generate energy.
• The tower’s curved facade will reduce the heat gain throughout the year.
• Exterior sun shades will dramatically improve the workplace environment
• Artificial lighting in the office
• photo voltaic used to create renewable energy
Other case are reported here read on: http://living-future.org/casestudies
Prepared by Net Zero Energy Building Architect Perumal Nagapushnam

Net Energy Building for Office Tower

Models for Net Zero Energy Buildings are used by  Net Zero Architects to calculate the amount of energy saving in the schematic stages of the design, which then are  used as a basis of energy  design control through out the design implementation stages.The model is a 3-D electronic model of a building, it is also a simplified model without much details of the building, which will help calculate the calculation intentions. It is refereed as a shoe box model. There are many types of models used in designing a Net Zero Energy Building design.There are 11 types of Energy Model, which are:

1.) Heat Transfer model for Net Zero Energy Buildings in House Floor Plans
Model show that show how the heat is transferred from the outside to the interiors of the building architectural floor plans.
2.) Lighting model for Net Zero Energy Buildings  in House Floor Plans
Model showing how the day light penetrates top the interiors of the building and it helps Architect to design the light fittings in the building architectural layout outs.
The study of a the lighting levels through out the day would show the amount of light derived from the sun into the building and it helps the Net Zero Energy Buildings Architects to design the additional lighting need ed to make the building sufficiently lighted up.
The amount of light that can be daylight harvested can also be studied, note the amount of light lux derived from the sun is about 100,000-140,000 lux in comparison to what is needed in the office space is only a merger 400lux, the potentials of day light harvesting has to be considered seriously in the light of the current worldwide needs.
3.) BIM Model-Building Information Model for Net Zero Energy Buildings  in House Floor Plans
A digital computerized model, which has information about clashes of the architectural and engineering elements, it provides information about costing, and when plug-in with time project management time line program, we are able to produce the physical model developing over the time line of the builder. The model can be used to study the thermal heat, energy model and total embodied energy of the building architectural plans. This is a great tool for architects and project management consultants.
4.) Energy Model  for Net Zero Energy Buildings  in House Floor Plans
–A simple model used for computerized computation of the energy usage in the building for every month or per year based on the climate conditions, and the building insulation and orientation for buildings. A designing tool, which is helpful to Net Zero Energy Buildings Architects in  choosing the mass proportion and selection of materials.
5.) Wind Model for Net Zero Energy Buildings  in House Floor Plans
– A simple model used for computerized computation of the direction of the wind into the building based on the openings of the buildings. It will help Net Zero Energy Buildings Architects to decide where openings shall be created to enable wind to be harvested.
6.) CFD-for Net Zero Energy Buildings  in House Floor Plans
Computerized Fluid Dynamics is a study of the flow of air in  a  building, where the direction is established and the comfort is designed and it is a tool for Net Zero Energy Buildings Architects to remove impediments to comfort. It helps the architects to design buildings of how the heated air flows, how the ventilation of air flows throughout the building.
7.) Massing and Study Model for Net Zero Energy Buildings  in House Floor Plans
-a model used by Net Zero Energy Buildings Architects to evaluate the proportion, the shape , bulk , form aesthetics and how the form affects the environment.
8.) Thermal Model for Net Zero Energy Buildings  in House Floor Plans
– a model which reveal the sides of the building, where is heated up during the day. With the Thermal model the building designer may be able to decide how the building may be treated or insulated to keep the thermal heat from entering in to the building.
9.) Solar Path Model– for Net Zero Energy Buildings  in House Floor Plans
The path of the sun through out the year, and how it affects the building’s shadow and how it affects the sun’s rays into the window openings and show how the sun’s ray falls on the building and the building’s shadows is cast and how the neighboring building’s shadow affect the building that is being designed.
10.) Ventilation Model– for Net Zero Energy Buildings  in House Floor Plans
The study of wind and movement of air within the building

Contact us for your NZEB designs..we will be able to help you in the interest to secure the building in being less independent to the energy utility companies.check out our house floor plans.

Prepared by Net Energy Architect Perumal Nagapushnam, Green Architect of http://www.sda-architect.com/