Brink, Henk Willem

Hanze UAS repository

Centre of Expertise EnergyThermalcomfort (Fanger, 1970) Personal variablesActivity level Assumption1.2 met Thermal resistance of the clothingAssumption1.0 cloEnvironmental variablesAir temperature MeasuredWater vapour pressure in ambient air MeasuredMean radiant temperatureVertical air temperaturedifference and distance to window is measuredRelative air velocityAssumption0.09 m s-1Source Indoortemperature(°C)Humidity(%)Vertical airtemperaturedifference(°C)Mean air velocityspeed(m s-1)CO2(ppm)NPR-CR 1752 (1999) 22.0 ± 1.022.0 ± 2.022.0 ± 3.030-70 0,150,180,214606001190NEN-EN-ISO 7730 (2005) 22.0 ± 1.022.0 ± 2.022.0 ± 3.060 <2<3<40,150,180,21NEN-EN 15251 (2007) 21.020.019.030-5025-6020-70>70<207509001200<1200n=182Value for Building LG n=151 Value for Building PS n=31Mean age (s.d.) 47.3 (10.8) years 38.7 (9.4) yearsSex Male 41% Female 59%Male 26% Female 74%260 first year students of the School of Facility Management collected the measurements at the workstation of the office worker under supervision of the researcherThe occupant completed an 18-item satisfaction questionnaire An Atal ENV-MB350NV temperature sensor, humidity sensor, carbon dioxide sensor and a ruler were used to collect data ResultsThe recorded indoor temperature was between 18 and 24°CIn 97% of the cases the humidity percentage was categorized in category I (30-50%)In 94% of the cases the vertical air temperature difference was between 0-2°CIn 95% of the cases the carbon dioxide concentration was categorized < 850 ppm)H.W. (Henk) Brink, MScFacility Management Research Group, Hanze University of Applied Sciences Groningen, The Netherlandsh.w.brink@pl.hanze.nl+31 (0)505952249M.P. (Mark) Mobach, PhDFacility Management Research Group,Hanze University of Applied Sciences, Groningen, The Netherlandsm.p.mobach@pl.hanze.nlß Scale too warm (α= 0.77)ß Scale too cold (α= 0.79)ß Grading temperatureß Scale air quality(α= 0.64)ß Grading air qualityOutdoor temperature (Θe)Indoor temperature at desktop height (Θo) 0.305*** -0.232** -0.302***Indoor humidityVertical air temperature differenceDistance between the occupant and the nearest window-0.152**Carbon dioxide concentrationAgeGender0.230** 0.191**Indoor temperature at desktop height (Θo)Total Gradingtemperature% Satisfied % Dissatisfied19 11 6.09 55 4520 27 6.70 70 3021 50 5.38 50 5022 53 5.47 60 4023 30 4.93 50 50 Two modern Dutch office buildings (local government, private sector) Buildings meets all Dutch building standards Building type HVAC Windows can not be openedResearch methodQuality and satisfaction of thermal comfort in Dutch officesTheory ObjectsConclusionThis study indicates that an indoor temperature higher than 22oC might be too warm for office workers in The Netherlands during wintertime and that application might influence workers’ satisfaction negativelyResultsStandardsRegressionanalysesEnvironmentTemperature

Quality and satisfaction of thermal comfort in Dutch offices

https://research.hanze.nl/ws/files/15951309/Poster_Indoor_climate_Henk_W_Brink_EuroFM_2016_v3.pdf

Quality and satisfaction of thermal comfort in Dutch offices

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