Sustainable Education Building Design at NUIG

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The New Engineering Building at the National University of Ireland in Galway was designed as a living laboratory of sustainability for students. An article in the CIBSE Journal looks at its complex heating and cooling systems.

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  • CIBSE Journal January 2012 www.cibsejournal.com28

    BUILDING CASE STUDYEDUCATING ENGINEERS

    !N)RISHUNIVERSITYSENGINEERINGDEPARTMENTHASANEWBUILDINGTHATWASDESIGNEDTOOPERATEASALIVINGLABORATORYOFSUSTAINABILITYFORSTUDENTS!NDY0EARSONTAKESSTOCKOFITSCOMPLEXHEATINGANDCOOLINGSYSTEMS

    THEGLASSANDALUMINIUMCLAD.EW%NGINEERING"UILDINGATTHE.ATIONAL5NIVERSITYOF)RELANDIN'ALWAYWASCONCEIVEDASATEACHINGTOOLFORTHEENGINEERINGSTUDENTSWHONOWOCCUPYITSROOMSANDLABORATORIES/PENEDIN*ULYLASTYEARTHESTRUCTUREISINTENDEDTOBEALIVINGLABORATORYWITHAWIDERANGEOFSENSORSANDEXPOSEDFEATURESTOSHOWSTUDENTSHOWTHEBUILDINGLIVESANDBREATHES-OREOVERMANYOFTHESERVICESAREONSHOWTOTHESTUDENTSANDSTAFF'LASSPANELSINTHEBUILDINGSENERGYCENTREGIVEVIEWSONTOTHEWORKINGBIOMASSBOILERANDCOMBINEDHEATANDPOWER#(0UNITS,ABELLEDSERVICESEXPOSEDINTHECORRIDORSCHALLENGESTUDENTSTOUNDERSTANDTHEENGINEERINGPRINCIPLESBEHINDTHESCHEMESDESIGN!NDADASHBOARDINTHEENTRANCEATRIUMINFORMSTHEOCCUPANTSOFTHEBUILDINGSPERFORMANCEBYMEANSOFREALTIMEDATAONENERGYANDWATERCONSUMPTION4HISDESIGNCONCEPTISUNUSUAL)TWASDEVELOPEDTODEMONSTRATEAHOSTOFDIFFERENTTECHNOLOGIESANDPASSIVETHINKINGINCLUDINGNATURALVENTILATIONTHERMALMASSGROUNDSOURCEHEATPUMPSSOLARPANELSAND#(0SYSTEMSTOINSPIRETHEENGINEERSOFTHEFUTURE(OWEVERINADDITIONTOSHOWCASINGTHEVARIOUSTECHNOLOGIESTHEBUILDINGALSOHADTOBEDESIGNEDTOBEENERGYEFCIENTANDENVIRONMENTALLYSUSTAINABLE!SABUILDINGFORTEACHINGENGINEERINGITWASDESIGNEDTOBEASSUSTAINABLEASPOSSIBLESAYS,ORCfN-OONEYOF0-'ROUPWHICHDESIGNEDTHEBUILDINGSERVICESFORTHEPROJECT)TISANAMBITIOUSTASKGIVENTHE

    ON-SITE

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  • January 2012 CIBSE Journal 29www.cibsejournal.com

    ORDERTOMODULATETHEFANSSPEEDS4HELABORATORIESONTHEGROUNDRSTSECONDANDTHIRDOORSOFTHEWESTERNELEVATIONARETOODEEPTOBEVENTILATEDUSINGWINDOWSALONE)NSTEADAHYBRIDSOLUTIONOFOPENINGWINDOWSANDSTACKVENTILATIONISUSED4HEWINDOWSVENTILATETHEAREAOFTHEROOMCLOSESTTOTHEFAlADEWHILETHEAREAFURTHESTFROMTHEWINDOWSISVENTILATEDUSINGSTACKVENTILATIONTHROUGHCHIMNEYSPOSITIONEDTODRAWAIRACROSSTHELABORATORIES!IROWRATESARECONTROLLEDBYMODULATINGDAMPERSINTHECHIMNEYSOPERATEDBYTHE"-3/NTHETOPOORWHERESTACKVENTILATIONISLIMITEDTHECHIMNEYSAREALSOTTEDWITHBOOSTERFANS4HISSCHEMEPROVESTHATBYSPENDINGALITTLEMOREMONEYYOUCANBEENERGYEFCIENTSAYS-OONEY4OMINIMISEWINTERINLTRATIONLOADADDITIONALAIRISDRAWNINTOTHELABORATORIESFROMTHECIRCULATIONCORRIDOR4HISINTURNDRAWSAIRFROMOTHERLABSANDFROMTHE

    SQMSIZEOFTHEBUILDINGTHENUMBERANDVARIETYOFSYSTEMSPRESENTANDTHEFACTTHATMANYOFTHESEINCLUDEMANUALOVERRIDEOPTIONS!SARESULTTHENALSOLUTIONISFARFROMSTRAIGHTFORWARDANDTHETASKOFINTEGRATINGTHEVARIOUSENGINEERINGSYSTEMSINTOANENERGYEFCIENTSOLUTIONSHOULDPROVIDEACHALLENGINGHANDSONLEARNINGEXPERIENCEFORSTAFFANDSTUDENTSALIKE

    Ventilation strategy-OSTOFTHEROOMSARENATURALLYVENTILATEDASPARTOFTHELOWENERGYDESIGNSEEBOXONPAGE!CCORDINGTO-OONEYTHEDESIGNERSHAVEGONETOGREATLENGTHSTOENSUREACOMFORTABLEENVIRONMENTWHILEALSOEMPOWERINGTHESTUDENTS)TISCRITICALTHEOCCUPANTSAREINDIRECTCONTROLOFTHEIRENVIRONMENTHESAYS2OOMSWITHOUTWINDOWSAREALSONATURALLYVENTILATED4HESINGLESTOREYHIGHBAYLABORATORIESINTHECENTREOFTHEGROUNDOORUTILISEASERIESOF

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  • BUILDINGSATRIUMTHROUGHTRANSFERGRILLESSETINTHEDOORS!DIFFERENTNATURALVENTILATIONSOLUTIONISUSEDFORTHECLASSROOMSONTHESECONDANDTHIRDOORSOFTHENORTHERNELEVATION4HESEROOMSBACKONTOACIRCULATIONCORRIDOR"ECAUSETHEROOMSARETOODEEPTOBEVENTILATEDBYTHEFAlADEALONEDUCTSHAVEBEENINSTALLEDABOVETHECORRIDORTOFORMALINKWITHTHECENTRALLIGHTWELLTOENCOURAGEAIRMOVEMENT4HEDUCTSARETTEDWITHMODULATINGDAMPERSCONTROLLEDBYTHE"-3&ORTHEPOSTGRADUATEAREASOCCUPYINGTHETOPTWOOORSONTHEBUILDINGSSOUTHERNELEVATIONTHENATURALVENTILATIONSOLUTIONHASBEENCOMBINEDWITHANAIRCONDITIONINGOPTIONTOPROVIDEAMIXEDMODESOLUTION&ORTHEBULKOFTHEYEARTHESEARENATURALLYVENTILATEDUSINGWHAT-OONEYDESCRIBESASACLIMATEFAlADE4HISISANMMDEEPTRIPLESKINGLAZEDFAlADEWITHADOUBLEGLAZEDINNERLEAFANDASINGLEGLAZEDOUTERLEAFCOVERINGTHEBUILDINGSSOUTHERNELEVATION4HECAVITYBETWEENTHEINNERANDOUTERLEAFISVENTILATEDBYLOUVRESATTHETOPOFTHEFAlADE)NWINTERWITHTHELOUVRESCLOSEDTHESOUTHFACINGFAlADEPREHEATSTHEFRESHAIRBEFOREITENTERSTHROUGHWINDOWSOPENING

    INTOTHECAVITY)NSUMMERTHELOUVRESOPENTOALLOWAIRTORISEUPANDOUTOFTHECAVITYPREVENTINGITFROMGETTINGTOOWARMBEFOREITENTERSTHEROOM3WITCHESINTHEWINDOWMULLIONSALLOWTHEOCCUPANTSTOOVERRIDETHE"-3ANDOPENANDCLOSETHEWINDOWSACCORDINGLY4HECLIMATEWALLALSOFEATURESANAUTOMATEDEXTERNALBLINDTTEDONTHEOUTSIDETOMINIMISESOLARGAIN4HENATURALVENTILATIONSYSTEMFORTHEPOSTGRADUATEAREASOPERATESUNTILTHEINTERNALTEMPERATURERISESABOVE#ATWHICHPOINTTHEDISPLACEMENTAIRCONDITIONINGSYSTEMWILLKICKINWITHAIRSUPPLIEDTHROUGHTHEOORVOID/PENINGSINTHEDIVIDINGWALLHELPTODRAWAIRACROSSTHEPOSTGRADUATEROOMSANDINTOTHEATRIUM-OONEYDESCRIBESTHEATRIUMASTHEBUILDINGSLUNGS3MOKEVENTILATORSMOUNTEDINTHEATRIUMROOFOPENANDCLOSEUNDERCONTROLOFTHE"-3TOVENTILATETHEAREATHE"-3ALSOPREVENTSTHESMOKEEXTRACTFANSRUNNINGINTHISMODE!IRISALSODRAWNFROMTHEATRIUMINTOTHEBUILDINGSCORRIDORSWHEREITPROVIDESTEMPEREDMAKEUPAIRFORTHELABORATORIES4HEBUILDINGINCLUDESSEVERALLARGELECTURETHEATRES4HESEAREKEPTCOMFORTABLEUSINGADISPLACEMENTVENTILATIONSYSTEMWITHFRESHAIRSUPPLIEDAT#THROUGHSWIRLDIFFUSERSBENEATHEACHSEATANDEXTRACTEDATHIGHLEVEL-OONEYSAYSTHELOWVELOCITYSWIRLDIFFUSERSCREATEAMICROCLIMATEAROUNDTHEOCCUPANTS!DDITIONALMECHANICALCOOLINGISPROVIDEDBYAPACKAGEDAIRCOOLEDCHILLER$URINGNORMALTERMTIMESMECHANICALCOOLINGISNOTEXPECTEDTOBENEEDEDBECAUSETHEOUTSIDEAIRTEMPERATUREDOESNOTNORMALLYGOABOVE#FROM/CTOBERTO-AYSAYS-OONEY#OOLINGISALSOPROVIDEDTOGROUPSOFSPECIALISTLABORATORIESTUCKEDINTOTHENORTHWESTCORNEROFTHEBUILDINGONTHERSTSECONDANDTHIRDOORS4HESEROOMSHOUSEEXPERIMENTSTHATNEEDSTABLECONDITIONSTHROUGHOUTTHEYEARANDARECOMFORTCOOLEDUSINGACTIVECHILLEDBEAMS3OMEOFTHECOMPUTERROOMSAREALSOPROVIDEDWITHCOOLINGANDHEATINGUSINGCHILLEDBEAMS,IKETHEPOSTGRADUATEAREASTHESETOOHAVEAMIXEDMODESERVICINGSTRATEGY4HEBUILDINGISCOMPLEXDUETOTHENUMBEROFMIXEDMODESTRATEGIESIFYOUWEREDESIGNINGACOMMERCIALBUILDINGWITHAFOCUSONPRELIMINARYINSTALLATIONCOSTSYOUWOULDONLYDESIGNFORONE(6!#SYSTEMTOGUARANTEEACOMFORTABLEENVIRONMENTTHROUGHOUTTHEYEARSAYS-OONEY4HEMIXEDMODESTRATEGIESWILLENABLEAREDUCTIONINTHEBUILDINGSENVIRONMENTALFOOTPRINT

    CIBSE Journal January 2012 www.cibsejournal.com30

    BUILDING CASE STUDYEDUCATING ENGINEERS

    The natural ventilation strategy is helped by the exposed concrete softs, which add thermal mass. In its basic format, the ventilation strategy is based on two rows of opening windows, one above the other. The high-level windows open and close under control of the building management system (BMS), while the lower windows can be opened manually. For the ofces and laboratories on the eastern elevation the

    system is controlled as follows:L As the air temperature rises above summer and winter operational settings, the BMS will progressively open the high-level windows.L In winter (from October to the end of April), if the lighting passive infrared sensor (PIR) detector indicates a room is occupied, and when CO2 levels exceed the zone set point, the BMS will open the high-level windows by 5%.

    L The windows will remain open unless the wind speed exceeds a pre-set level, it starts to rain or internal air temperature falls.L The occupants can override the BMS using a wall-mounted rocker switch to open or close the windows.L In addition, the occupants can also open the lower line of windows manually.L At night the windows will open to remove excess heat under a night purge strategy.

    Ventilation Building management system

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    )NSUMMERTHESEROOMSWILLBENATURALLYVENTILATEDUNTILTHEINTERNALTEMPERATURERISESABOVE#THENACTIVECHILLEDBEAMSWITHMECHANICALCOOLINGWILLOPERATEANDMAINTAINTHEROOMBELOW#)NWINTERTHEWINDOWSHAVEBEENDESIGNEDTOOPENBYTOSUPPLYFRESHAIRWHILETHEPERIMETERCHILLEDBEAMUNITSWILLSUPPLYHEAT&ROMOURDYNAMICTHERMALMODELLING)THINKTHESPACEWILLBENATURALLYVENTILATEDFORMOSTOFTHEYEARSAYS-OONEY

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    L $*#4&(VJEF' &OFSHZFGDJFODZJOCVJMEJOHT is available online to CIBSE members for free through the Knowledge Portal. It can also be purchased in hard copy (by both members and non-members) at a discount of 75% by using the code GVFJAN. A new edition of the guide will be published in the rst quarter of 2012. Visit XXXDJCTFLOPXMFEHFQPSUBMDPVL

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    CIBSE Journal >> www.cibsejournal.com32

    BUILDING CASE STUDY1/

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    The CIBSE Republic of Ireland branch, chaired by Derek Mowlds and comprising an active and dedicated committee, delivers a number of additional services locally to CIBSE members in Ireland.

    The committee arranges a host of interesting CPD events throughout the year in a number of locations, covering a wide range of technical and related topics in engineering and the built environment.

    The branch also promotes

    a philosophy of integration in design and, to that end, collaborates with other institutions on particular events, such as Green Building Week, with the Irish Green Building Council and the BIM awareness programme with CITA.

    They host an annual conference in Croke Park, which attracts members nationwide, and includes speakers from the UK and further a eld.

    Recently, CIBSE Republic of Ireland collaborated with the Dublin Institute of Technology to publish the +PVSOBMPG4VTUBJOBCMF3FTFBSDIBOE%FTJHO which was formally launched on 24 November and is available for download at IUUQFMFDFOHEJUJFTEBS4%"3@+PVSOBM@4FQU@QEG For further information, visit XXXDJCTFJSFMBOEPSH or email EFSFLNPXMET!QNHSPVQHMPCBMDPN

    CIBSE branch ,iLVvi>`

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