BuildingRating

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Glossary of Building Rating Terms

Click a term to see its definition.

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Deep Reduction

Deep Reduction or Deep Energy Reduction is a term used in US for a deep renovation or a deep refurbishment, which aims at 75 % or more reduction in energy use compared to before the improvement. E.g. the 1000 homes challenge. [Source: GBPN, 2012]

Deep Refurbishment

Deep Refurbishment or Deep Energy Refurbishment means to bring something back from a state of reduced efficiency to a better state with ‘deep’ indicating a very substantial improvement of the energy use. [Source: GBPN, 2012]

Deep Renovation

Deep Renovation or Deep Energy Renovation is a term for a building renovation that captures the full economic energy efficiency potential of improvements. This typically includes a focus on the building shell of existing buildings in order to achieve very high-energy performance. The renovated building consumes 75% less primary energy compared to the status of the existing building before the renovation. The energy consumption after renovation for heating, cooling, ventilation, hot water and lighting, is less than 60 kWh/m2/yr. (Definition often used in Europe) [Source: GBPN, 2012]

Deep Retrofit

Deep retrofit or Deep Energy Retrofit implies replacing existing systems in a building with similar ones that are of higher quality and performance, which leads to a better energy performance of an existing building. The primary energy consumption includes energy used for heating, cooling, ventilation, hot water, lighting, installed equipment and appliances. After the deep retrofit the buildings consume 50% less primary energy compared to the status of theexisting building/s the retrofit (Definition mainly used in US). [Source: GBPN, 2012]

Deep Scenario

The Deep Scenario or Deep Energy Scenario is defined as a scenario, in which state of the art in both new and existing buildings will become the norm in only ten years from now. [Source: Urge-Vorsatz, D. (CEU) (2012) Best Practice Policies for Low Carbon and Energy Buildings-Based on Scenario Analysis]

Delivered Energy

Energy, expressed per energy carrier, supplied to the technical building systems through the system boundary, to satisfy the uses taken into account (heating, cooling, ventilation, domestic hot water, lighting, appliances, etc.) or to produce electricity. For active solar and wind energy systems the incident solar radiation on solar panels or on solar collectors, or the kinetic energy of wind is not part of the energy balance of the building. Delivered energy can be calculated or it can be measured. [Source: International ISO Standard 13790- Energy performance of buildings — Calculation of energy use for space heating and cooling (2008)]

Derived Heat

Derived heat covers the total heat production in heating plants and in combined heat and power plants. It includes the heat used by the auxiliaries of the installation which use hot fluid (space heating, liquid fuel heating, etc.) and losses in the installation/network heat exchanges. For autoproducing entities (entities generating electricity and/or heat wholly or partially for their own use as an activity which supports their primary activity) the heat used by the undertaking for its own processes is not included. [Source: Eurostat]

Design Energy Rating

An asset rating which uses design stage building characteristics and standard values to assess the energy performance of an un-built building. [Source: CEN Standard - EN 15217 Energy performance of buildings - Overall energy use and definition of energy ratings]

Design Intent Tools

Rating software and processes designed to perform design energy ratings (Aus). [Source: Lawrence Berkeley National Laboratory (2002) Design Intent Tool]

Development Companies

The development companies act as public or private decision makers (e.g. public and semi-public development corporations). [Source: IEA Annex 31 Glossary]

District Cooling

The distribution of thermal energy in the form of steam, hot water or chilled liquids, from a central source of production through a network to multiple buildings or sites, for the use of space or process heating or cooling [Source: EPBD recast, 2010/31/EU].

District Heating

The distribution of thermal energy in the form of steam, hot water or chilled liquids, from a central source of production through a network to multiple buildings or sites, for the use of space or process heating or cooling [Source: EPBD recast, 2010/31/EU].