Low-energy house

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A thermogram compares the heat radiation of the windows and walls of two buildings: a sustainable, low-energy passive house (right) and a conventional house Passivhaus thermogram gedaemmt ungedaemmt.png
A thermogram compares the heat radiation of the windows and walls of two buildings: a sustainable, low-energy passive house (right) and a conventional house

A low-energy house is characterized by an energy-efficient design and technical features which enable it to provide high living standards and comfort with low energy consumption and carbon emissions. Traditional heating and active cooling systems are absent, or their use is secondary. [1] [2] Low-energy buildings may be viewed as examples of sustainable architecture. Low-energy houses often have active and passive solar building design and components, which reduce the house's energy consumption and minimally impact the resident's lifestyle. Throughout the world, companies and non-profit organizations provide guidelines and issue certifications to guarantee the energy performance of buildings and their processes and materials. Certifications include passive house, BBC—Bâtiment Basse Consommation—Effinergie (France), zero-carbon house (UK), and Minergie (Switzerland). [3]

Contents

Buildings alone were responsible for 38% of all human Greenhouse gas emissions (GHG) as of 2008, with 20% attributed to residential buildings and 18% to commercial buildings. [4] According to the Intergovernmental Panel on Climate Change (IPCC), buildings is the sector which presents the most cost effective opportunities for GHG reductions. [5]

Background

During the 1970s, research on low-energy buildings was done in Denmark, Sweden, Germany, Canada, and the United States. The implementation of standardized low-energy building concepts has developed differently in each country. [6]

Canada

In the late 1970s, the province of Saskatchewan contracted the Saskatchewan Research Council to design and build a passive solar house suitable for the extreme climate of the Canadian prairies, where winter temperatures can drop to negative 40 degrees Celsius (-40°F). [7] The project resulted in the construction of the Saskatchewan Conservation House in Regina in 1977 by a team led by engineer Harold Orr. [8] The project developed a heat recovery air exchanger (HRV), hot water recovery, and a blower-door apparatus to measure building air-tightness, techniques that became common in low-energy building in other parts of the world. [9] Orr would go on to apply many of those techniques to retro-fitting existing buildings to improve energy efficiency. [10] [11]

Germany

Triggered in the 1970s by the first energy crisis and growing environmental awareness, energy conservation became increasingly important in Germany. [12] In 1977, the country's first energy-related building standard was enacted. The German Passivhaus Institute introduced the first certified passive house in 1990. The annual heating requirement was introduced as an important parameter by the third German Thermal Insulation Ordinance (1995). In 2013, however, there was no clear legal requirement for a low-energy building standard in Germany. According to Maria Panagiotidou and Robert J. Fuller, definitions, policies and construction activity of zero-energy buildings must be clear. [13] The European Union's Energy Performance Directive requires that beginning in 2021, only low-energy buildings may be built. [14]

United Kingdom

Changes to national policies have occurred since May 2015 in the UK. One of the most significant has been the withdrawal of the Code for Sustainable Homes (CfSH) as a system for assessing and encouraging improvements in the environmental design of dwellings. [15] This has abandoned the code's schematic which provided a framework of achievement levels and to which low-energy designers could aspire to meet or surpass. Although energy-conservation legislation still exists in the building regulations, [16] there is a lack of suitable standards exceeding basic regulations. As a result, the Passive House Standard may expand its influence and impact on energy-efficient houses. [17]

United States

Interest in low-energy buildings has increased in the United States, primarily due to rising energy prices, decreasing costs for onsite renewable-energy systems, and increasing concern about climate change. California requires all new residential construction to be zero net energy by 2020. [1]

Types

Low-energy houses are broadly defined, but are generally known as houses with a lower energy demand than common buildings regulated by the national building code. The term "low-energy house" is used in some countries for a specific type of building. [18]

A low-energy house is a guideline rarely specified in actual values (heat load or space-heating minimum). A passive house is a standard, with specific recommendations to save heating energy.

At one end of the spectrum are buildings with an ultra-low space-heating requirement which require low levels of imported energy (even in winter), approaching an autonomous building. At the opposite end are buildings where few attempts are made to reduce their space-heating requirement and which use high levels of imported energy in winter. Although this may be balanced by high levels of renewable-energy generation throughout the year, it imposes greater demands on the national energy infrastructure during winter.

National standards

The term "low-energy houses" may refer to national building standards. [19] These standards sometimes seek to limit the energy used for space heating, which is the largest energy consumer in many climate zones. Other energy uses may also be regulated. The history of passive solar building design provides an international view of one form of low-energy-building development and standards.

Europe

Standards for low-energy buildings in Europe have proceeded differently in each country, and there is no common certification or legislation for low-energy buildings valid in all EU member states. As a movement towards reducing energy use and emissions, a common legislation concerning buildings’ energy performance, the Energy Performance of Buildings Directive (EPBD) was published in 2002 and became effective in January 2003. [20]

Norway

In NS 3700, the draft official standard, low-energy buildings are defined. About the buildings' energy performance, two alternatives for rating their primary energy use are under discussion:

  • A limit on a building's annual CO2 emissions, calculated by multiplying the annual supplied energy by a CO2 factor
  • A percentage of its heating demand must be met with renewable energy.

Denmark

Low-energy houses are defined in the National Building Regulation Building Regulations 08, and are divided into two classes. They are regulated in the regulations' chapter 7.2.4: Low-energy.

Germany

Low-energy houses certified by RAL-GZ 965 have 30 percent less heat losses than regulated in the EnEV, a national building code. Other criteria affect insulation, air tightness and ventilation. Low-energy buildings may be certified by RAL-GZ 965 for planning or construction. [18]

Switzerland

Low-energy buildings may receive the Minergie certification, a "quality label for new and refurbished buildings". The Minergie standard requires that buildings do not exceed 75 percent of average building energy consumption and fossil-fuel consumption must not exceed 50 percent of the average. [21]

North America

The European Union directive has clarified low-energy houses in Europe, and a large portion of the discussions on zero-energy building in North America derives from the U.S. National Renewable Energy Laboratory (NREL). [22]

The Energy Star program is the largest certifier of low-energy homes and consumer products in the U.S. Although certified Energy Star homes use at least 15 percent less energy than standard new homes built in accordance with the International Residential Code, they typically achieve a 20- to 30-percent savings. [23] The United States Department of Energy introduced a program in 2008 to distribute zero-energy housing across the country. [24]

Canadian builders may use a range of standards, labels, and certification programs to demonstrate a high level of energy performance in a given project. These include:

In British Columbia the above programs align with the BC Energy Step Code, a provincial regulation to incentivize (or require) a level of energy efficiency in new construction beyond the base building code. The code was designed as a technical road map to help the province reach its target of all new net-zero-energy-ready buildings by 2032.

Obstacles and opportunities

Energy-efficient design often relies on new technologies and techniques. These may create technical obstacles in addition to social, cultural, and economic non-technical obstacles. Despite these obstacles, opportunities exist for skilled, knowledgeable professions to create cost-efficient solutions for energy efficiency in buildings. [17]

Buildings designed for good energy efficiency do not always live up to the design goals; various reasons lead to this performance gap.

Technology

Low-energy building design is considered important to encourage resource efficiency and reduce global climate change associated with the burning of fossil fuels. Design involves two general strategies: minimizing the need for energy use in buildings (especially for heating and cooling) through energy-efficient measures (EEMs) and adopting renewable energy and other technologies (RETs) to meet remaining energy needs. EEMs include building envelopes, internal conditions, and building-services systems; RETs include photovoltaic or building-integrated photovoltaic, wind turbines, solar thermal (solar water heaters), heat pumps, and district heating and cooling. Impacts include life-cycle costs, environmental impacts, and climate-change and social-policy issues. [29] The best low-energy designs offer occupants a better environment and more stable, controlled thermal comfort in addition to reduced energy costs.

GHG emissions associated with buildings construction are mainly coming from:

  1. Materials manufacturing (e.g., concrete)
  2. Materials transport
  3. Demolition wastes transport
  4. Demolition wastes treatment

The construction, renovation, and deconstruction of a typical building is on average responsible for the emissions of 1,000–1,500 kg CO2e/m2 (around 500 kg CO2e/m2 for construction only).

Strategies adopted by low-carbon buildings to reduce GHG emissions during construction include:

  1. Reduce quantity of materials used
  2. Select materials with low emissions factors associated (e.g., recycled materials)
  3. Select materials suppliers as close as possible to the construction.
  4. Divert demolition wastes to recycling instead of landfills or incineration

Energy efficiency

Reduction of energy consumption is more environmentally and financially advantageous than increasing onsite production to reach a low-energy goal. The less a home consumes, the smaller renewable-energy system it requires to reach net zero. Energy efficiency should always be the primary design strategy of a low-energy house. [1]

Improvements

Passive solar design and landscaping

Passive solar building design and energy-efficient landscaping support the low-energy house in conservation and can integrate it into a neighborhood and environment. Following passive solar building techniques, where buildings are compact in shape to reduce surface area and principal windows oriented towards the equator (south in the Northern Hemisphere and north in the Southern Hemisphere) maximizes passive solar gain. However, solar gain (especially in temperate climates) is secondary to minimizing the overall house-energy requirements. In hot temperatures, excess heat can create uncomfortable indoor conditions. Passive alternatives to air-conditioning systems, such as temperature-dependent venting, have been shown to be effective in regions with cooling needs. [30] Other techniques to reduce excess solar heat include brise-soleils, trees, attached pergolas with vines, vertical gardens, and green roofs.

Although low-energy houses can be constructed from dense or lightweight materials, internal thermal mass is normally incorporated to reduce summer peak temperatures, maintain stable winter temperatures, and prevent possible overheating in spring or autumn before the higher sun angle "shades" midday wall exposure and window penetration. Exterior wall color (when the surface allows choice) reflection or absorption depends on the predominant year-round outdoor temperature. The use of deciduous trees and wall trellised (or self-attaching) vines can assist in temperate climates.

Lighting and electrical appliances

To minimize total primary energy consumption, passive and active daylighting are the first daytime solutions to employ. For low-light days, non-daylight spaces and nighttime, sustainable lighting design with low-energy sources (such as standard-voltage compact fluorescent lamps and solid-state lighting with LED lamps, OLEDs and polymer light-emitting diodes and low-voltage incandescent light bulbs, compact metal halide, xenon and halogen lamps) can be used.

Solar-powered exterior security and landscape lighting, with solar cells on each fixture or connecting to a central solar panel, are available for gardens and outdoor needs. Low-voltage systems can be used for more controlled (or independent) illumination, using less electricity than conventional fixtures and lamps. Timers, motion detection and daylighting operation sensors further reduce energy consumption and light pollution.

Home appliances meeting independent energy-efficiency testing and receiving Ecolabel certification marks for reduced electrical and natural-gas consumption and product-manufacturing carbon emission labels are preferred for low-energy houses. Energy Star and EKOenergy are other certification marks.

See also

Buildings

Air and temperature

Solar

Sustainability

Energy rating standards

Related Research Articles

A Trombe wall is a massive equator-facing wall that is painted a dark color in order to absorb thermal energy from incident sunlight and covered with a glass on the outside with an insulating air-gap between the wall and the glaze. A Trombe wall is a passive solar building design strategy that adopts the concept of indirect-gain, where sunlight first strikes a solar energy collection surface in contact with a thermal mass of air. The sunlight absorbed by the mass is converted to thermal energy (heat) and then transferred into the living space.

<span class="mw-page-title-main">Passive solar building design</span> Architectural engineering that uses the Suns heat without electric or mechanical systems

In passive solar building design, windows, walls, and floors are made to collect, store, reflect, and distribute solar energy, in the form of heat in the winter and reject solar heat in the summer. This is called passive solar design because, unlike active solar heating systems, it does not involve the use of mechanical and electrical devices.

<span class="mw-page-title-main">Energy conservation</span> Reducing energy consumption

Energy conservation is the effort to reduce wasteful energy consumption by using fewer energy services. This can be done by using energy more effectively or changing one's behavior to use less service. Energy conservation can be achieved through efficient energy use, which has some advantages, including a reduction in greenhouse gas emissions and a smaller carbon footprint, as well as cost, water, and energy savings.

<span class="mw-page-title-main">Solar water heating</span> Use of sunlight for water heating with a solar thermal collector

Solar water heating (SWH) is heating water by sunlight, using a solar thermal collector. A variety of configurations are available at varying cost to provide solutions in different climates and latitudes. SWHs are widely used for residential and some industrial applications.

<span class="mw-page-title-main">Heat recovery ventilation</span> Method of reusing thermal energy in a building

Heat recovery ventilation (HRV), also known as mechanical ventilation heat recovery (MVHR) or energy recovery ventilation (ERV), is a ventilation system that recovers energy by operating between two air sources at different temperatures. It is used to reduce the heating and cooling demands of buildings.

<span class="mw-page-title-main">Sustainable energy</span> Energy that responsibly meets social, economic, and environmental needs

Energy is sustainable if it "meets the needs of the present without compromising the ability of future generations to meet their own needs." Most definitions of sustainable energy include considerations of environmental aspects such as greenhouse gas emissions and social and economic aspects such as energy poverty. Renewable energy sources such as wind, hydroelectric power, solar, and geothermal energy are generally far more sustainable than fossil fuel sources. However, some renewable energy projects, such as the clearing of forests to produce biofuels, can cause severe environmental damage.

<span class="mw-page-title-main">Green building</span> Structures and processes of building structures that are more environmentally responsible

Green building refers to both a structure and the application of processes that are environmentally responsible and resource-efficient throughout a building's life-cycle: from planning to design, construction, operation, maintenance, renovation, and demolition. This requires close cooperation of the contractor, the architects, the engineers, and the client at all project stages. The Green Building practice expands and complements the classical building design concerns of economy, utility, durability, and comfort. Green building also refers to saving resources to the maximum extent, including energy saving, land saving, water saving, material saving, etc., during the whole life cycle of the building, protecting the environment and reducing pollution, providing people with healthy, comfortable and efficient use of space, and being in harmony with nature. Buildings that live in harmony; green building technology focuses on low consumption, high efficiency, economy, environmental protection, integration and optimization.’

<span class="mw-page-title-main">Energy-plus building</span> Edifices with surplus electricity

An energy-plus building produces more energy from renewable energy sources, over the course of a year, than it imports from external sources. This is achieved using a combination of microgeneration technology and low-energy building techniques, such as: passive solar building design, insulation and careful site selection and placement. A reduction of modern conveniences can also contribute to energy savings, however many energy-plus houses are almost indistinguishable from a traditional home, preferring instead to use highly energy-efficient appliances, fixtures, etc., throughout the house.

<span class="mw-page-title-main">Passive house</span> Type of house

Passive house is a voluntary standard for energy efficiency in a building, which reduces the building's ecological footprint. It results in ultra-low energy buildings that require little energy for space heating or cooling. A similar standard, MINERGIE-P, is used in Switzerland. The standard is not confined to residential properties; several office buildings, schools, kindergartens and a supermarket have also been constructed to the standard. The design is not an attachment or supplement to architectural design, but a design process that integrates with architectural design. Although it is generally applied to new buildings, it has also been used for refurbishments.

<span class="mw-page-title-main">Sustainable architecture</span> Architecture designed to minimize environmental impact

Sustainable architecture is architecture that seeks to minimize the negative environmental impact of buildings through improved efficiency and moderation in the use of materials, energy, development space and the ecosystem at large. Sustainable architecture uses a conscious approach to energy and ecological conservation in the design of the built environment.

<span class="mw-page-title-main">Zero-energy building</span> Energy efficiency standard for buildings

A Zero-Energy Building (ZEB), also known as a Net Zero-Energy (NZE) building, is a building with net zero energy consumption, meaning the total amount of energy used by the building on an annual basis is equal to the amount of renewable energy created on the site or in other definitions by renewable energy sources offsite, using technology such as heat pumps, high efficiency windows and insulation, and solar panels.

Renewable heat is an application of renewable energy referring to the generation of heat from renewable sources; for example, feeding radiators with water warmed by focused solar radiation rather than by a fossil fuel boiler. Renewable heat technologies include renewable biofuels, solar heating, geothermal heating, heat pumps and heat exchangers. Insulation is almost always an important factor in how renewable heating is implemented.

Domestic housing in the United Kingdom presents a possible opportunity for achieving the 20% overall cut in UK greenhouse gas emissions targeted by the Government for 2010. However, the process of achieving that drop is proving problematic given the very wide range of age and condition of the UK housing stock.

<span class="mw-page-title-main">Building insulation</span> Material to reduce heat transfer in structures

Building insulation is material used in a building to reduce the flow of thermal energy. While the majority of insulation in buildings is for thermal purposes, the term also applies to acoustic insulation, fire insulation, and impact insulation. Often an insulation material will be chosen for its ability to perform several of these functions at once.

The 2030 Challenge is an initiative by Edward Mazria and Architecture 2030 to make all new buildings and renovations carbon-neutral by the year 2030 to avoid the catastrophic effects of climate change caused by the building sector. Buildings, construction, and operational activities generate nearly 40% of annual Greenhouse Gas (GHG) emissions, consequently, there is a larger scope to stabilize and reverse emissions in this sector, in order to avoid increased global warming to reach a tipping point. Therefore, instead of seeing it as a trying issue, Architecture 2030, a non-profit organization, strives to beat the woes of climate change by implementing energy-efficient planning and design.

<span class="mw-page-title-main">Efficient energy use</span> Energy efficiency

Efficient energy use, sometimes simply called energy efficiency, is the process of reducing the amount of energy required to provide products and services. For example, insulating a building allows it to use less heating and cooling energy to achieve and maintain a thermal comfort. Installing light-emitting diode bulbs, fluorescent lighting, or natural skylight windows reduces the amount of energy required to attain the same level of illumination compared to using traditional incandescent light bulbs. Improvements in energy efficiency are generally achieved by adopting a more efficient technology or production process or by application of commonly accepted methods to reduce energy losses.

<span class="mw-page-title-main">Zero-carbon city</span> City that has no carbon footprint

A zero-carbon city is a goal of city planners that can be variously defined. In a narrower sense of energy production and use, a zero-carbon city is one that generates as much or more carbon-free sustainable energy as it uses. In a broader sense of managing greenhouse gas emissions, a zero-carbon city is one that reduces its carbon footprint to a minimum by using renewable energy sources; reducing all types of carbon emissions through efficient urban design, technology use and lifestyle changes; and balancing any remaining emissions through carbon sequestration. Since the supply chains of a city stretch far beyond its borders, Princeton University's High Meadows Environmental Institute suggests using a transboundary definition of a net-zero carbon city as "one that has net-zero carbon infrastructure and food provisioning systems".

Zero-carbon housing is a term used to describe a house that does not emit greenhouse gasses, specifically carbon dioxide (CO2), into the atmosphere. Homes release greenhouse gases through burning fossil fuels in order to provide heat, or even while cooking on a gas stove. A zero carbon house can be achieved by either building or renovating a home to be very energy efficient and for its energy consumption to be from non-emitting sources, for example electricity.

Sustainable refurbishment describes working on existing buildings to improve their environmental performance using sustainable methods and materials. A refurbishment or retrofit is defined as: "any work to a building over and above maintenance to change its capacity, function or performance' in other words, any intervention to adjust, reuse, or upgrade a building to suit new conditions or requirements". Refurbishment can be done to a part of a building, an entire building, or a campus. Sustainable refurbishment takes this a step further to modify the existing building to perform better in terms of its environmental impact and its occupants' environment.

<span class="mw-page-title-main">Passive daytime radiative cooling</span> Management strategy for global warming

Passive daytime radiative cooling (PDRC) is a zero-energy building cooling method proposed as a solution to reduce air conditioning, lower urban heat island effect, cool human body temperatures in extreme heat, move toward carbon neutrality and control global warming by enhancing terrestrial heat flow to outer space through the installation of thermally-emissive surfaces on Earth that require zero energy consumption or pollution. In contrast to compression-based cooling systems that are prevalently used, consume substantial amounts of energy, have a net heating effect, require ready access to electricity and often require coolants that are ozone-depleting or have a strong greenhouse effect, application of PDRCs may also increase the efficiency of systems benefiting from a better cooling, such like photovoltaic systems, dew collection techniques, and thermoelectric generators.

References

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