ACOUSTICS VENTILATION & OVERHEATING GUIDANCE

1 Anthony ChiltonANC Conference 21stJune 2017 ACOUSTICS VENTILATION & OVERHEATING GUIDANCE AVOGTHE PROBLEMV entilation is required to achieve good air quality and to mitigate VENTILATION can result in unacceptablyhigh indoor ambient noise levels. Buildings that don t work. This has become an increasing problem as buildings become better insulated and more -AIMSHelp acousticians understand VENTILATION and out desirable indoor ambient noise levels. Provide quantitative, usable GUIDANCE for designers, planners, pre-completion worked -WORKING GROUPAVOG -CONTENTSS ection 1 -IntroductionSection 2-Relevant legislation and GUIDANCE AcousticsSection 3 Internal ambient noise level Transport noise Mechanical services noiseSection 4 Worked exampleAVOG -SCOPENew residential development that will be exposed predominantly to airborne sound from transport sources, and to sound from mechanical services that are serving the dwelling.

2 NOISE FROM TRANSPORT SOURCESTwo distinct situationsPart F VENTILATION conditionOverheating conditionPART F VENTILATION CONDITIONOVERHEATING CONDITIONWhat is an appropriate indoor ambient noise level?What about BS8233 values?Would imply mechanical cooling (air-con) on sites with Lday>60dB, Lnight>55dB. Not to allow higher levels for OVERHEATING condition on the basis that it occurs for only part of the time and occupants may accept a trade-off between acoustic and thermal conditions given that they have some control over their environment. No specific research available combined exposure to heat & noiseOVERHEATING CONDITION BASIS OF GUIDANCEThe acceptability of higher internal ambient noise levels has been considered in terms of various effects such as.

3 Daytime annoyanceDaytime interference with activities (conversations, watching tv, telephone)Night-time sleep disturbanceOVERHEATING CONDITION DAYTIMEE xternal Free-field Noise Level (LAeq,16hr)SourceEffect50525456586062646 66870 Assume D = 12dB for a partially open window OVERHEATING CONDITION DAYTIMEE xternal Free-field Noise Level (LAeq,16hr)SourceEffect50525456586062646 66870BS8233 (2014)Reasonable conditionsOVERHEATING CONDITION DAYTIMEE xternal Free-field Noise Level (LAeq,16hr)SourceEffect50525456586062646 66870BS8233 (2014)Reasonable conditionsNoise Insulation RegsTrigger for grant -RoadNoise Insulation RegsTrigger for grant -RailNoise Insulation RegsTrigger for grant -AirAviation Policy FrameworkEligibility for sound insulationOVERHEATING CONDITION DAYTIMEE xternal Free-field Noise Level (LAeq,16hr)SourceEffect50525456586062646 66870BS8233 (2014)Reasonable conditionsNoise Insulation RegsTrigger for grant -RoadNoise Insulation RegsTrigger for grant -RailNoise Insulation RegsTrigger for grant -AirAviation Policy FrameworkEligibility for sound insulationWHO (1999)Speech -'understood fairly well'WHO (1999)Speech -'raised voice'BS8233 (2014)

4 Speech -'raised voice at 2m'Wilson (1963)Speech -'tolerable'* OVERHEATING CONDITION DAYTIMEE xternal Free-field Noise Level (LAeq,16hr)SourceEffect50525456586062646 66870BS8233 (2014)Reasonable conditionsNoise Insulation RegsTrigger for grant -RoadNoise Insulation RegsTrigger for grant -RailNoise Insulation RegsTrigger for grant -AirAviation Policy FrameworkEligibility for sound insulationWHO (1999)Speech -'understood fairly well'WHO (1999)Speech -'raised voice'BS8233 (2014)Speech -'raised voice at 2m'Wilson (1963)Speech -'tolerable'*AVOGRisk CategoryLOWMEDIUMHIGHOVERHEATING CONDITION NIGHT-TIME AVERAGEE xternal Free-field Noise Level (LAeq,8hr)SourceEffect404244464850525456 5860 OVERHEATING CONDITION NIGHT-TIME AVERAGEE xternal Free-field Noise Level (LAeq,8hr)SourceEffect404244464850525456 5860BS8233 (2014)Reasonable conditionsOVERHEATING CONDITION NIGHT-TIME AVERAGEE xternal Free-field Noise Level (LAeq,8hr)SourceEffect404244464850525456 5860BS8233 (2014)Reasonable conditionsPPG24 (2006 -withdrawn)Cat C threshold -road, air, mixedPPG24 (2006 -withdrawn)

5 Cat C threshold -railOVERHEATING CONDITION NIGHT-TIME AVERAGEE xternal Free-field Noise Level (LAeq,8hr)SourceEffect404244464850525456 5860BS8233 (2014)Reasonable conditionsPPG24 (2006 -withdrawn)Cat C threshold -road, air, mixedPPG24 (2006 -withdrawn)Cat C threshold -railWHO NNG (2014)LOAELWHO NNG (2014)Health effects -'Interim target' OVERHEATING CONDITION NIGHT-TIME AVERAGEE xternal Free-field Noise Level (LAeq,8hr)SourceEffect404244464850525456 5860BS8233 (2014)Reasonable conditionsPPG24 (2006 -withdrawn)Cat C threshold -road, air, mixedPPG24 (2006 -withdrawn)Cat C threshold -railWHO NNG (2014)LOAELWHO NNG (2014)Health effects -'Interim target'Schutz gegen Flugl rmThreshold for mitigationStansteadThreshold for mitigationNottinham East MidlandsThreshold for mitigationOVERHEATING CONDITION NIGHT-TIME AVERAGEE xternal Free-field Noise Level (LAeq,8hr)SourceEffect404244464850525456 5860BS8233 (2014)Reasonable conditionsPPG24 (2006 -withdrawn)Cat C threshold -road, air, mixedPPG24 (2006 -withdrawn)Cat C threshold -railWHO NNG (2014)LOAELWHO NNG (2014)

6 Health effects -'Interim target'Schutz gegenFlugl rmThreshold for mitigationStansteadThreshold for mitigationNottinham East MidlandsThreshold for mitigationAVOGRisk CategoryLOWMEDIUMHIGHOVERHEATING CONDITION 2 LEVEL ASSESMMENTL evel 2 Level 1D 12dBExternal Free-fieldLAeq,TInternalLAeq,TD > 12dBNOISE FROM MECHANICAL SERVICESS ubstantial research demonstrates that if noise from mechanical VENTILATION is considered excessive by the occupants, where they have control they will turn down the system to a level of noise that is tolerable, or disable it entirely. Either of these actions result in insufficient distinct situationsPart F VENTILATION conditionOverheating conditionSUMMARY OF EXISTING GUIDANCERoom TypeApproved Document FLAeq,T(dB)CIBSE Guide ATable ,T(dB)Sound control for homes BRE/CIRIALAeq,T(dB)Bedroom303030 Living Room303535 Dining Room--35 Bathroom / WC--45 Kitchen-45-5045 PART F VENTILATION CONDITIONV entilation ConditionPossible system or design solutionSource for desirable internal ambient noise levels from mechanical servicesPart F Whole Dwelling VentilationSystem 3: Continuous mechanical extract (MEV), minimum low VENTILATION ratesApproved Document FSystem 4.

7 Continuous mechanical supply and extract with heat recovery (MVHR), minimum low VENTILATION ratesPart F Extract VentilationSystem 1: Intermittent extract fansComfort criteria from CIBSE Guide A, Table control for homes BRE / CIRIAS ystem 3: Continuous mechanical extract (MEV), minimum high VENTILATION ratesSystem 4: Continuous mechanical supply and extract with heat recovery (MVHR), minimum high VENTILATION ratesPart F Purge VentilationManually controlled fan exchanging a minimum 4 air changes per hourNo desirable noise levels are currently proposed based on the lack of evidence of acceptable noise levelsConsider criteria above for adjacent rooms in the same dwellingOVERHEATING CONDITIONThe levels shown in the table are based on systems which are operated to meet the design conditions to control noise levels may be acceptable for boost mode.

8 Possible system or design solutionSource for desirable internal ambient noise levels from mechanical servicesMechanical VENTILATION introducing ambient airComfort criteria from CIBSE Guide A Table control for homes BRE / CIRIAM echanical system introducing cooled airPROGRAMME FOR PUBLICATIONW orked Example / Case Studies being allowed for review by a small selected draft to ANC members before the end of the WORKR esearch study of the human response to, and inter-dependence of, acoustic and thermal comfort in dwellings. THANK YOU