CIBSE Guide L: Sustainability meets ASHRAE Green Guide

1 14 November 2007 CIBSE Guide L: SustainabilitymeetsASHRAE Green GuidePresented by Hywel DaviesCIBSE Technical DirectorBased on material prepared byDave Cheshire, Faber Maunsell14 November 2007 CIBSE Guide L meets ASHRAE Green GuideCIBSE Guide L:Sustainability14 November 2007 CIBSE Guide L meets ASHRAE Green GuideASHRAEG reenGuide14 November 2007 CIBSE Guide L meets ASHRAE Green GuideDefining SustainableDevelopment14 November 2007 CIBSE Guide L meets ASHRAE Green GuideDefiningsustainability providing for theneeds of thepresent withoutdetracting from theability to fulfill theneeds of the future GreenGuide14 November 2007 CIBSE Guide L meets ASHRAE Green GuideDefiningsustainability -GreenGuide Minimising natural resourceconsumption Renewable energy resources toachieve net zero energyconsumption Minimising emissions, includingindoor air quality, greenhousegases Minimising discharge of solidwaste and liquid effluents Minimal negative impacts on siteecosystems Maximise quality of indoorenvironmentIAQE nergy & waterRenewables14 November 2007 CIBSE Guide L meets ASHRAE Green GuideDrivers forsustainabilitycf Owners ProjectRequirements inGreenGuideCIBSE IntroductionFigure 614 November 2007 CIBSE Guide L meets ASHRAE Green GuidePlanning drivers PPS on Planning and Climate Change Further Alterations to the London Plan(including proposed 20% renewablestarget) SPG on Sustainable Design andConstruction Ensuring Part L compliance pre-planning= more involvement early on14 November 2007 CIBSE Guide L meets ASHRAE Green GuideASHRAE GreenGuide OverviewContent.

2 Three Basic SectionsBasics(Chapters 1 2)Design Process(Chapters 3 16)Post Design(Chapter 18)14 November 2007 CIBSE Guide L meets ASHRAE Green GuideASHRAE Green GuideThe Design Process Chapter 3: Commissioning (Cx) Why is this the 3rd chapter in the book? Phases of CommissioningPreliminaryDesignConstructi onAcceptanceContinuousCx14 November 2007 CIBSE Guide L meets ASHRAE Green GuideCommissioning ..a comprehensive commissioning process thatstarts during pre-design .. The main role at pre-design is to developcomprehensive Owners Project Requirements This is similar to the role of the sustainabilitychampion Also, look at commissionability of the systems atdesign phase14 November 2007 CIBSE Guide L meets ASHRAE Green Guide14 November 2007 CIBSE Guide L meets ASHRAE Green GuideLEED and BREEAM Provides a chapter onLEED guidance forHVAC engineers BREEAM not aseparate chapter inCIBSE - referencedwherever relevant14 November 2007 CIBSE Guide L meets ASHRAE Green GuideGreenGuide targets Achieve a level of energy use at least 50% lower than theDOE-compiled average levels for the same building type andregion, both projected an in actual operation.

3 Provide at least 15% of the building s annual energy use (inoperation) from renewable sources Achieve per capita water usage 40% lower than thedocumented average for building type and region Recycle products and post-occupancy evaluation (NOTE: Still deals in energy rather than CO2)14 November 2007 CIBSE Guide L meets ASHRAE Green GuideSetting targets14 November 2007 CIBSE Guide L meets ASHRAE Green GuideConceptualbuilding modelling GreenGuideadvocates the useof conceptualbuilding modelling,and optionsappraisal14 November 2007 CIBSE Guide L meets ASHRAE Green Guide0200,000400,000600,000800,0001,000, 0001,200,0001,400,0001,600,000 Notional (Part L)Proposed (Part L)Total carbon dioxideemissionsRenewables targetCarbon dioxide emissions (kgCO2yr)Small powerDHWL ightingVentilationCoolingHeating28%10%Pa rt LPlanningEnergy strategy14 November 2007 CIBSE Guide L meets ASHRAE Green GuideShiny new toys14 November 2007 CIBSE Guide L meets ASHRAE Green GuideShiny new toys14 November 2007 CIBSE Guide L meets ASHRAE Green GuideAdapting to climatechange GreenGuide proposes nightpre-cooling as a strategy Guide L shows Urban HeatIsland effect problems in cities Central London 5 6 Cwarmer than rural areas.

4 Difficult to dissipate heat atnight14 November 2007 CIBSE Guide L meets ASHRAE Green GuideLiving roofs Vegetation absorbs less heatthat bare roofs Transpiration of waterprovides cooling andhumidifying effect Helps heat island andreduces amount of coolingrequired Can be used with PV (See CIBSE Green Roofs KS)14 November 2007 CIBSE Guide L meets ASHRAE Green GuideAdapting to climatechangePredicted impacts of climatechange include: general increases intemperatures, including milderwinters and rising summertemperatures enhanced urban heat island wetter winters, more intenserainfall dryer summers higher daily mean winter windspeedsClimate Change Scenarios for the UK,UKCIP02 (2002)14 November 2007 CIBSE Guide L meets ASHRAE Green GuideUrban heat islandeffect In central London theurban heat islandeffect can currentlylead to temperature5 6 C warmer thantemperatures in ruralareas outside London.

5 Difficult to dissipateheat at night14 November 2007 CIBSE Guide L meets ASHRAE Green GuidePollution -Refrigerants14 November 2007 CIBSE Guide L meets ASHRAE Green GuideUser controlsBORDASS W., LEAMAN A and BUNN R, Controls for End Users: a Guide for good design andimplementation, Building Controls Industry Association (BCIA), March 2007 ISBN 0 86022 62214 November 2007 CIBSE Guide L meets ASHRAE Green GuideFees Less kit = lower fees! GreenGuide: reducingloads should be avaluable service 7% of fee forconceptual design is itenough?14 November 2007 CIBSE Guide L meets ASHRAE Green GuideCost of beinggreen? GreenGuideargues that it iscost neutral Productivity andoperating costsshould be off-set14 November 2007 CIBSE Guide L meets ASHRAE Green GuideLessons learntDifferences: Commissioning considered at start Adapting to climate change Load reduction or shiny toys? Wide topic: Sustainability should we focus more?

6 All greenhouse gases matter CO2 emissions important14 November 2007 CIBSE Guide L meets ASHRAE Green GuideLessons learntSimilarities: Increase role of engineers Early involvement (loadreduction etc.) Similar definition ofsustainability Advocate / champion forsustainability Set targets at the start ofthe project