Guldberg School - Velux

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Indoor climateThe roof windows facing southMaximum daylight and ventilation are preconditionsfor ensuring optimal indoor comfortand minimal energy consumption consistentwith future standards.In a world with increasing health problems(partly due to e.g. the rising incidence ofallergies), the indoor climate is an essentialfactor to be considered when designing abuilding.Several studies prove that daylight hasa positive effect on health, productivity,children’s learning abilities and generalwell-being. Similarly, fresh air via naturalventilation is vital for producing a healthyindoor climate reducing the consequencesof toxic emissions from sources such aselectronic devices and chemicals in thebuilding – and thereby minimising the riskof allergies.Physical well-being, high productivity andlearning are related to a healthy indoor climate.Therefore, an optimal indoor climatefor pupils and teachers will always be worthwhile. For exemple, the Centre for IndoorClimate and Energy at The Technical Universityof Denmark has shown that pupils inpublic schools can acquire the same amountof knowledge in six years that they mustspend seven years learning today by optimisingthe indoor climate. The two most importantconditions precedent to a pleasantindoor climate is adequate ventilation and acomfortable room temperature.Automatic control of natural ventilationThe planned complete solution to naturalventilation and control of the room tempe-rature for the Guldberg school project isbased on the fully automatic control systemNV Advance from WindowMaster. It willmonitor all strategically placed VELUX roofwindows including sunscreening. Windowopening will be controlled automatically tooptimise the indoor climate proportional toindoor and outdoor temperatures and theuse of the building.Climate zonesThe building will be divided into three ventilationzones each with their own sensorsand parameters; the climate in the zoneswill be monitored individually accordingto wind direction, wind speed and air pressureon the façade as well as indoor andoutdoor temperatures and CO 2 -level. Theair pressure on the facades is calculated byCFD calculations carried out specifically forthis project. This will result in optimisationof the window openings according to 16 differentwind directions and is an importantpart of the control strategy.A calendar module controls ventilation accordingto the season (summer/winter) andtime of day (night, morning, daytime) andalso optimises the ventilation according tothe following ventilation methods:• Fresh air function – just before lessonsbegin in the morning or during scheduledbrakes, the building is ventilated so theair will feel fresh and pleasant.• Night cooling – efficient cooling of thethermal mass of the unused building atnight to avoid too high day temperaturesduring summer. The cooling of the buildingis adapted to the thermal load theday before.• Pulse ventilation – opening of windowsand closing shortly after to allow minimumair change in the building – especiallysuited for cold periods and to avoidheat loss.• Trickle ventilation – continuous airchange, especially suited for hot periodsand to create refreshing airflow.• User control – if the user wants to takecontrol of the ventilation, it is possible tooverrule the control system by switchesor the user interfaced NV Visual.• Safety function – in case of rain orstorm, windows will close for safetyreasons.Apart from precise control of the naturalventilation, other systems such as sunscreening,radiators, mechanical ventilatorsor light control can also be integrated intothe system to ensure optimal indoor climatewith minimal energy consumption. This isall controlled by the service module NVVisual, which enables change of parametersfor the system via the Internet. Everyzone is visualised in NV Visual, which alsoenables easy monitoring of the indoor climate,window openers, radiators etc.The three zones include monitoring of 14VELUX INTEGRA® roof windows with sunscreeningand the VELUX solar collectorsfor visualization of the output from the collectors.The educational effortThe climate issue will be part of the educationalwork and applied in both natural andsocial science lessons. The idea is to makethe pupils conscious about our mutual responsibilityof reducing energy consumptionand preventing serious climate changes andglobal warming.On the centrally placed touch screen and viaIP addresses the pupils can keep track ofmeasurements and they can see detailsabout the solar heat output, power consumptionand temperatures – as well as theCO 2 level.10GULDBERG SCHOOL
Daylight factorThe lowered existing roof windows with thenew smaller windows aboveDaylight Factor % Average: 2.7910.008.97.86.65.54.33.22.1The existing roof windowsDaylight Factor % Average: 2.2110.008.97.86.65.54.33.22.1FactsThe daylighting performance of the GuldbergSchool has been specified using thedaylight factor (DF) as performance indicator.The daylight factor is a common and easyto-usemeasure for the available amountof daylight in a room. It expresses the percentageof daylight available inside, on awork plane, compared to the amount ofdaylight available outside the building underknown overcast sky conditions. Thehigher the DF, the more daylight is availablein the room. Rooms with an averageDF of 2% or more are considered daylit. Aroom will appear strongly daylit when theaverage DF is above 5%.The daylight factor analysis has been performedusing computer simulations of radiance.The figures on the left show thedaylight factor levels obtained for two differentvariants evaluating the impact ofthe installed roof windows on the finalizeddesign.The comparison of results shows the positiveeffects of adding roof windows on thedaylight conditions of the third floor. Itshows that the roof windows deliver highlevels of daylight in the centre part of theroom.The challenge in the rooms has been to get access to clear view, therefore, the existing windowshave been lowered and smaller windows have been installed above the existing ones forventilation purpose. Futhermore, the windows can be used as escape exits as required by theDanish Building Law.VELUX 11
Page 3: The ChallengeThe City of Copenhagen
Page 6 and 7: Active HouseAn initiative supported
Page 8 and 9: Intelligent houses of the future wi
Page 13 and 14: EnvironmentArea renewalThe Ministry
Page 15 and 16: The Guldberg SchoolCopenhagen, Denm

Guldberg School - Velux

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