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1 OVEROPHEDNING, BRUG AF KØLING OG AKTIV SOLAFSKÆRMNING - PER HEISELBERG INSTITUT FOR BYGGERI OG ANLÆG
2 WHY DO WE EXPERIENCE AN OVERHEATING PROBLEM IN HIGH PERFORMANCE BUILDINGS? OVERHEATING IS A NEW AND INCREASING PROBLEM FOR LOW ENERGY BUILDINGS (RESIDENCES) More focus on energy than indoor environment (less requirements for documentation) is underestimated and are not given enough focus in the design process Old rules of thumb still used TOO SIMPLIFIED DESIGN METHODS ARE USED Averaging heat loads in time and space Uncertain correlation between cooling need and overheating risk
3 WHY DO WE EXPERIENCE AN OVERHEATING PROBLEM IN HIGH PERFORMANCE BUILDINGS? IT IS NOT POSSIBLE TO REACH GOALS THROUGH MORE Envelope insulation, Building airtightness, Ventilation heat recovery, WHICH ARE ROBUST TECHNOLOGIES WITHOUT USER INTERACTION NEW MEASURES NEEDS TO BE INCLUDED Demand controlled ventilation Shading for solar energy control Shading for daylighting control Lighting control Window opening ALL TECHNOLOGIES: Where performance is very sensitive to control Which involve different degree of user interaction Whose function and performance are difficult for users to understand
4 ENERGY RENOVATION OF TYPICAL HOUSING
5 ENERGY RENOVATION ENERGIPARCEL, TILST, DENMARK
6 ENERGIPARCEL RENOVATION EXAMPLES Reference: Tine Steen Larsen, Aalborg University and Jørgen Søndermark, Realdania Byg
7 ENERGIPARCEL OVERHEATING 2010 Temperatur Living Room Mejløvænget 9 Langøvænget 1 Farøvænget 4 Langøvænget 8 > 26 C (hours) > 27 C (hours) Reference: Tine Steen Larsen, Aalborg University and Jørgen Søndermark, Realdania Byg
8 ENERGY RENOVATION AND OVERHEATING IN TYPICAL HOUSING IN CENTRAL/NORTH EUROPE AUSTRIA Area 144 m 2 Ref. 2 DENMARK Area 118 m 2 Ref. 1 FRANCE Area 116 m 2 Ref. 1 UNITED KINGDOM Before 1978 Area 80 m 2 Ref TABULA project web tool, Retrieved from hp://webtool.building- typology.eu/webtool/tabula.html (September, 2014). 2. Österreichisches Instut für Bautechnik, 2013, "Dokument zum Nachweis der Kostenopmalität der Anforderungen der OIB- RL6 bzw. des Naonalen Plans gemäß Arkel 4 (2) zu 2010/31/EU." Austria. 3. Department for Communies and Local Government, 2013, "Energy Performance of Buildings Direcve (recast). Cost opmal calculaons: UK report to European Commission". U.K
9 SELECTED RENOVATION MEASURES WINDOWS RETROFIT (REGULATIONS AND NZEB/PH STANDARD) +CEILING RETROFIT (REGULATIONS AND NZEB/PH STANDARD) ++EXTERNAL WALL RETROFIT (REGULATIONS AND NZEB/PH STANDARD) +++FLOOR RETROFIT (REGULATIONS AND NZEB/PH STANDARD) ++++AIRTIGHTNESS IMPROVEMENT (REGULATIONS AND NZEB/PH STANDARD)
10 THERMAL CHARACTERISTICS FOR REFERENCE CASES AND DIFFERENT RENOVATION LEVELS a/a Reference' period Uwall' (W/m²K) Uceiling'' (W/m²K) Ufloor'' (W/m²K) Uwin/g' (W/m²K) n50'(ach) Austria Base After' / Renovation / nzeb / Denmark Base 1973O / Renovation /2015/ /0.7O 1.20/ /0.8 France Base 1982O / Renovation / nzeb / UK Base Before' / Renovation / nzeb / Number'of' Storey '(semi' detached) Source CostOOptimal' report TABULA CostOOptimal' report/tabula CostOOptimal' report
11 RENOVATION CASE - DENMARK Regulaons NZEB/PH
12 RENOVATION CASE DENMARK - OVERHEATING HOURS PER WEEK PHASES 1. Reference 2. Regulaon 3. NZEB/PH
13 RELATION BETWEEN ANNUAL HEAT GAINS AND HEAT LOSSES WITH OVERHEATING % (26 C) Annual Heat Gains Kwh/m Annual Heat Losses kwh/m 2
14 PERCENTAGE OF OVERHEATING HOURS FOR DIFFERENT OCCUPANCY LEVELS - DENMARK PHASES 1. Reference 2. Regulaon 3. NZEB/PH
15 PERCENTAGE OF OVERHEATING HOURS FOR DIFFERENT SHADING STRATEGIES - DENMARK PHASES 1. Reference 2. Regulaon 3. NZEB/PH
16 PERCENTAGE OF OVERHEATING HOURS FOR DIFFERENT VENTILATION FLOW RATES - DENMARK PHASES 1. Reference 2. Regulaon 3. NZEB/PH
17 Vinduets Facadens Energibalance (E ref )
18 NET ENERGY GAIN FACTOR (E REF ) I IS THE COEFFICIENT FOR THE HEAT GAIN (KWH/M 2 ) D IS THE COEFFICIENT FOR THE HEAT LOSS (KKH) Heating length season Reference (24/9-13/5) -4 weeks (7/10 30/4) -8 weeks (21/10 16/4) -10 weeks (28/10 9/4) Coefficient I (kwh/m 2 ) 26% N 41% S 33% E/W 100% North 100% South 100% East/West Coefficient D (kkh)
19 OPTIMIZATION
20 BUILDING ENERGY PERFORMANCE Improvement of heang energy use compared to a reference window CLASS BR2010 DISTRIBUTION OF WINDOW AREA South 43% North 12% East 20% West 25% REFERENCE FRAME U F =1,3 W/M 2 /K
21 RELATION BETWEEN ANNUAL HEAT GAINS AND HEAT LOSSES WITH OVERHEATING % (26 C) Annual Heat Gains Kwh/m Annual Heat Losses kwh/m 2
22 THEORETICAL CONTRA REAL PERFORMANCE
23 BYGNINGSFACADER BYGNINGSFACADEN ELLER KLIMASKÆRMEN ER AFGØRENDE FOR BÅDE ENERGIFORBRUG OG INDEKLIMA FACADEN BØR IKKE BETRAGTES SOM EN SIMPEL SKÆRM MOD UDEKLIMAET, MEN SOM ET SYSTEM DER OPFYLDER EN RÆKKE INDEKLIMAFUNKTIONER PÅ EN ENERGIEFFEKTIV MÅDE FACADENS KARAKTERISKE EGENSKABER OG FUNKTIONER BØR KUNNE TILPASSES DE SKIFTENDE UDEKLIMAFORHOLD OG KRAV TIL INDEKLIMAET FACADEN BØR VÆRE BYGNINGENS HUD HVORIGENNEM UDVEKSLING AF VARME, LUFT, LYS, FUGT, UDSYN, LYD, INDKIG, M.M. FOREGÅR PÅ EN KONTROLLERET MÅDE FACADERS YDEEVNE KAN KUN BESKRIVES, NÅR DENS FUNKTION SES I EN STØRRE SAMMENHÆNG 23
24 FACADENS FUNKTIONER ER MODSÆTNINGSFYLDTE Dagslys solafskærmning udsyn Vinduesåbning lydisolation Glasareal varmebehov/kølebehov MEDFØRER AT FACADEN IKKE KAN DIMENSIONERES MEN MÅ DESIGNES UD FRA EN OPTIMERINGSSTRATEGI Definition af vigtigste funktioner og funktionskrav Vægtning af funktionskrav efter aktuelle prioriteringer Vurdering af samspil med bygningens øvrige systemer (installationer og anlæg). 24
25 WILL CONTROL BE EFFECTIVE? THE PRIMARY OBJECTIVE OF USERS IS FULLFILLMENT OF THEIR NEEDS (INDOOR ENVIRONMENT) AND THEY WILL ALWAYS ADJUST CONTROLS ACCORDINGLY. THIS OFTEN LEADS TO HIGHER ENERGY USE AND POORER INDOOR ENVIRONMENT THAN EXPECTED. AUTOMATIC CONTROL IS A NEW TECHNOLOGY IN RESIDENCES AND SHOULD BE BETTER ADAPTED TO FULLFILMENT OF USER NEEDS Users override solar shading control to enjoy view or improve privacy (increase risk of overheating and large energy use) Automatical window airing are disconnected during night due to noise or secutrity (no night cooling) Window airing is continued in the winter season to get fresh air
26 BRUGERAFPRØVNING AF STYRINGSSTRATEGI FOR BLÆNDING
27 STYRINGS- STRATEGI
28 OCCUPANT SATISFACTION WITH TWO BLIND CONTROL STRATEGIES: SLATS CLOSED AND SLATS IN CUT-OFF POSITION a) Prefered solar shading strategy c) Is the view important to you? 8% 30% 0% 32% 68% 62% Simple Detailed No preference Not at all Moderately Very much
29 OCCUPANT SATISFACTION WITH TWO BLIND CONTROL STRATEGIES: SLATS CLOSED AND SLATS IN CUT-OFF POSITION a) If uncomfortable; I would change the blinds because I would like to have (simple) b) If uncomfortable; I would change the blinds because I would like to have (detailed) Number of responses Number of responses Yes To a certain degree Yes To a certain degree
30 AKTIVERING AF SOLAFSKÆRMNING OG VINDUESÅBNING I BOLIGER BOLIG FOR LIVET Kilde: Peter Foldbjerg, VELUX
31 UNDERSØGELSE AF ANVENDELSE AF SOLAFSKÆRMNING I ETAGEBOLIGER ANALYSERE BRUGERANVENDELSE AF SOLAFSKÆRMNING I FORHOLD TIL INDEKLIMA OG ENERGIFORBRUG UNDERSØGE BETYDNING AF INFORMATION OG FEEDBACK UNDERSØGE BRUGEROPFATTELSE AF FORSKELLIGE STYRINGSSTRATEGIER Energy Frames Projekt gennemføres i samarbejde med INWIDO og Himmerland Boligforening,
32 SUMMARY OVERHEATING IS AN ISSUE THAT S NEEDS TO BE ADDRESSED IN BOTH NEW HIGH PERFORMING BUILDINGS AS WELL AS IN DEEP RENOVATIONS SOLAR SHADING AND VENTILATIVE COOLING ARE SUSTAINABLE MEASURES THAT ARE ABLE REDUCE OVERHEATING RISK EXPECTED PERFORMANCE WILL BE REDUCED IN PRACTICE DUE TO USER OVERRIDE IMPROVED CONTROL STRATEGIES AND USER GUIDANCE MIGHT REDUCE THE DISCREPANCY BETWEEN EXPECTATIONS AND PRACTICE
33 Per Heiselberg Aalborg University E- mail: Thanks for your attention
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