Background•Thisresearch is focused on concept,trends, and ways to achieve the goal ofZero Energy Building.•Global warming and a probable energycrisis are the root cause for the initiation ofzero energy buildings
Doesn’t have any universal definition. Varies from country to country. Can be generalised as the building which have the total energy output/production equals to it’s total consumption on annual basis. The source of energy is supposed to be renewable with minimum carbon foot print. Furthermore, criterias like net zero carbon footprint can be added.
Percentage Space Heating Space Cooling Water Heating Lighting Refrigeratio n Source: US Department of Energy
In Europe around 40% of all energy is consumed by buildings. Ultimately, one of the major source of Carbon dioxide. Growing concern about global warming and its impacts. Rising energy costs and energy crisis.
Country Low Energy TargetAustria Annual heating energy consumption below 60-40 KWh/m².Belgium 40 % lower than standard levels, 30 % lower for office and school buildingsDenmark 50% lower than the minimum requirement for existing buildings.Finland 40 % less energy consuming than current buildings.France (40 - 65 )kWh/m² depending on the climatic area and altitude.Germany By 2020 buildings should be operating without fossil fuel, energy requirements (60-40 )kWh/m² .Netherlan 50 % reduction by 2015, 25 % reduction by 2010 bothds compared to current code plans.Sweden 20% decrease by 2020, 50% decrease by 2050 compared to 1995 consumption level.Source: SBI (Danish Building Institute), European Strategies to move towards very low energybuildings, 2008
• The BDCES groups the U-factor values based on three geographical zones in South Korea, • central, south and Jeju Island.Table 3 Maximum Heat Transmission (U-factor) of BuildingEnvelope Components by Region
The carbon reduction target of 2020, which aims to reduce energy consumption by 30%. low carbon green growth. (Active concept that advances the growth of new power source)
The first East-Asian to win the US Green Building Council’s prestigious LEED (Leadership in Energy and Environmental Design) platinum status.
Includes a 423m2 zero-energy house and a 298m2 public relations pavilion zero-emission green IT including a high performance façade daylight sensors ground source heat pumps radiant floor heating system and high-efficiency lighting that optimizes and balances energy and daylight.
These systems reduce energy consumption by 56% - the other 44% of energy is organically harvested from photovoltaic system, geothermal and wind power generationrenewable sources Source:- Samsung C&T Corporation, sustainability Report 2010
Green IT :- Energy Management System (EMS). Source:- Samsung E&C Corporation, sustainability Report 2010
Shutting down of nuclear plants Increase on price of oil Concern for green inittiative
Solar energy Wind energy Geo thermal energy Bio fuel energy Hydro power energy Ocean’s power supply
A house that consumes less energy than it produces in annual base. annual photovoltaic generation >1 annual energy consumption
Built in kanagawa, near Tokyo Zero energy house Energy demand close to zero by adoption of energy saving technology
Using photovoltaic energy generation and better building mechanism. Outer walls-234 mm thick and laminated of new ceramics(PALC)of 80 mm thick. Windows-triple glass sash, which improve thermal loss and air tightness.
Excess power sold to power companies. Air conditioning-heat pump system, hot water heated during night time to benefit from lower electric cost and reduce power consumption at the day time at peak cost.
Energy consumption of house is 8900kwh/year Pv generation is 8000 kwh/yr
Heating -1600kwh Cooking -1200kwh Domestic hot water-2100kwh Heating and appliances-4000kwh Total -8900 kwh Additional cost 70,000 euro Saving from running cost 3000 euro/yr
Greenest urban development on earth 4.63 million euro. 1000 houses Solar energy main source of power Lithium ion storage batteries, power to store for a week Planned to be in total use by 2018
Energy efficient office building used by the city of Helsinki Environment centre. Completed in September 2011 A perfect example of energy efficient building in Finland. Total purchased energy consumption of about 70 kWh/m^2 Total energy Production was about 17 kWh/m^2.
the window filled with Argon rather than normal air in order to improve the insulation. Roof has been designed in such a way that it utilises the daylight as much as possible . fig: Roof structure of Viikki Environment Centre
Solar panels mated with the façade for maximum energy production. Extensive use of wood to reduce carbon foot print. The ventilation system is Zero-specific and equipped with heat recovery system with almost 75% efficiency. All these renewable energy production for almost 20% of the total energy consumption Unique roof design to utilize maximum daylight and reduce lighting energy requirements The energy consumption for lightening fig: Southern Façade of Viikki Environment Centre. is further reduced by using LED lights.
Each country’s understanding of ZEB concept is unique. All countries emphasize the importance of energy efficiency measures. adopting such requirement the countries want to eliminate low-quality ZEBs. And significant influence of the occupants on the energy use in buildings.
Definition that aims:- ◦ minimize peak loads and ensuring a very low energy demand of the building. ◦ for user-friendly buildings. Not too much work or complicated. ◦ Passive or Very low energy buildings cost-efficient solutions for achieving zero energy buildings.