LAEQ,T
LAEQ (or LAeq) refers to Level A weighted Equivalent Continuous Sound Pressure and T refers to time, so it is a metric used in acoustics to quantify the average sound energy of a fluctuating noise over a specific time period. It represents the constant noise level that would produce the same sound energy over the same period as the actual fluctuating noise.It is often used in environmental noise standards and regulations, most recently in particular connected with the noise produced by air source heat pumps and wind turbines. See article equivalent continuous sound pressure level, heat pump and wind turbine sound calculations, as well as sound, sound absorption, sound absorption coefficient, and noise v sound.
For the purposes of the consultation Permitted development rights for small scale renewable and low carbon energy technologies and electric vehicle charging infrastructure March 2012 LAEQ,T refers to 'The equivalent continuous sound level - the sound level of a notionally steady sound having the same energy as a fluctuating sound over a specified measurement period (T). LAEQ, 5 min – refers to the equivalent continuous sound level over a 5 minute period.' The consultation also notes that the term 'Could benefit from further clarification'.
[edit] Related articles on Designing Buildings
- Air source heat pumps.
- Biomass.
- BSRIA domestic hot water heat pumps testing.
- Domestic building services compliance guide.
- Feed-In tariff.
- Ground source heat pump.
- Making the most of renewable energy systems DG 531.
- Microgeneration certification scheme
- Micro CHP.
- Micro grid.
- Microgeneration.
- Noise v sound.
- Non-domestic building services compliance guide.
- Pre-completion sound testing.
- Renewable energy.
- Renewable Heat Incentive.
- Renewable Energy Consumer Code RECC.
- Solar photovoltaics.
- Solar thermal.
- Sound.
- Sound absorption.
- Sound absorption coefficient.
- Sound frequency.
- UKAS accreditation for sound absorption testing.
- Wind turbine.
Featured articles
Check out some of the best features and news from Designing Buildings as well as key stories from around the web.
The heritage of nuclear and conventional power stations.
New measures to stop people being ripped off
Government to protect families from cowboy builders and aggressive bailiffs.
New Futurebuild showcase brings an innovation-first approach.
National Planning Policy Framework
Understanding the 2026 changes.
ECA's public affairs priorities
Member consultation opens to shape priorities for 2027 to 2030.
Dutyholder responsibilities from 1 July 2026.
Where performance meets practice
The Building Envelope Stage at UKCW Birmingham.
CIAT publishes briefing on planning reforms.
Leaders in Learning for Practice Network
Call for conservation leaders in learning to register interest in new network.
The importance of early engagement
Construction lessons from the Trillium HealthWorks Experience Centre.
Mayors are to be given planning call in powers
Mayors across England will be able to make the most important planning decisions.
The Master Builder: William Butterfield and his times. Book review.