Roman fritsches retrofitting buildings averdung 120316
Retrofitting BuildingsExamples from Hamburg and Northern Germany Dipl.-Wirtsch.-Ing. Roman Fritsches 20.03.2012
„Green and smart“ new buildings are already state of the art… EnEV defines energy efficiency for buildings (insulation and HVAC) EEWärmeG defines renewable energy sources for HVACSources:Technical University of DarmstadtIBA Hamburg GmbH 12.04.2012, Seite 2
…but retrofitting non-residential is much more difficult! Investor and case needs to be found Owner and user have different objectives Convincing investment cases need to be prepared There is „no show“ for the investor – energy efficiency is invisible! Complex technical problems need to be tackled Building insulation is often not easy or even impossible Existing HVAC technology needs to be assessed and considered Energy use and possible savings need to be assessed Use patterns need to be assessed and considered Who is in charge of HVAC energy control? Minimum annoyance to users 12.04.2012, Seite 3
Why retrofit non-residential buildings?Political point of view Building users point of view Energy use in buildings: 40% of Energy use is intransparent and total Energy use in Europe „necessary anyway“ 20% more efficiency wanted in HVAC operation costs make of 30% 2020 total costs retrofit rate needed: 2% No money for HVAC investments retrofit rate in Germany: 1% Most HVAC investments amortize in less than 10 years Subsidies granted Volatile and complex Never touch a running system Users confused Usually nothing runs but costs Subsidy experts necessary We have no experts inhouse Teaming up leads to optimal solutions 12.04.2012, Seite 4
Averdung retrofitting examples from HamburgWe have experience in retrofitting… (Historical) commercial buildings, Churches, Hospitals, Industrial buildings, Schools… … and a huge Bunker! 12.04.2012, Seite 5
Retrofitting (historical) Commercial Buildings Two buildings with 14.000 m² surface 24 air condition and cooling systems (> 5.000 m³/h each) Optimizing use patterns and controllers 12.04.2012, Seite 6
Retrofitting Churches Insulation is impossible - heat recovery is possible Availability is core issue Little heating gradients necessary 12.04.2012, Seite 7
Retrofitting Hospitals 200 kWh/m²a heat demand (30-60 kWh/m²a) Hamburg: four of 42 buildings assessed Hygiene needs to be considered Three PV-Installations to reduce power-use during daytime 12.04.2012, Seite 8
Retrofitting Industry Buildings 12.04.2012, Seite 9
Retrofitting „Energy Bunker“ – Renewable District Heating Current primary energy factor: > 1,1 Future primary energy factor: < 0,3 Meaningful use of a ruinSources:IBA Hamburg GmbHHHS Architekten 12.04.2012, Seite 10
Conclusions and Invitation1. Retrofit is more complex and less „shiny“ – you need experts and convincing investment cases2. Retrofit is politically wanted and means saving operational costs for the user3. Non-residential HVAC Investment: <10 year amortisation4. Historical buildings, churches, hospitals can also be retrofitted5. Renewable district heating is the future – visit Hamburg in email@example.com+49 40 - 48 50 969 51 12.04.2012, Seite 11
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