Renovation for better energy efficiency

Transcription

1 Renovation for better energy efficiency Knut Moe, Key Account Manager

2 About GK.. Contractor and servicepartner within the fields: Ventilation Building automation Refrigeration Piping Hydronic energy systems Energy Localized in Norway, Sweden and Denmark. Totally approx employees. Turnover around 365 mill Euro. HQ in Oslo: Biggest Passive House office building in Norway (14300m2, Breem certification: Very good )

3 Mission Our mission reflects the holistic effect of our services: Smart energy solutions saves the external environment Good Indoor Air Climate creates a good health and work environment Added value in society and for our customers

4 Business areas CONTRACTING, New buildings Ventilation Building automation Cooling Energy performance Cleanrooms Services from sub contractors Building contractors Total concepts or singular services Ventilation Building automation Cooling Energy performance Cleanrooms HVAC - Systems Services from sub contractors Property owners, Property management Companies, TECHNICAL SERVICE, Existing buildings

5 Partner in UPGRADE Solutions GK is one of the partners in the Norwegian research project Upgrade Solutions which is associated with the IEA SHC Task 47 Renovation of Non-Recidential Buildings towards Sustainable Standards. Identify drivers and obstacles for energy ambitious upgrades. Demonstrate integrated solutions for energy ambitious upgrades. Develop role model project for energy efficient upgrades. UPGRADE Solutions goal is to identify, exchange, develop and convey technical concepts which solve the challenges particular to upgrade of existing buildings towards Passive House standard with good architectural quality

6 Solbråveien Office senter, Asker outside Oslo GK aspire for a revenue of 3 billion NOK in 2012 Office building. Totally heated area: 10386m2. Built in 1982 Situation before renovation: Low tenant rate High energy use Ineffective area fore the tenants Outdated technical system Need for a general renovation

7 Actions The project was divided into two actions: Initial plan: Energy class B, low energy class Air to water heat pump Ventilation with heat recovery (85%) and low SFP Use of existing ducts and active supply air Demand controlled ventilation and lighting system New windows (1.0 W/m2K) with internal shading Additional insulation on all roofs Additional insulation on staircase rooms and gables Revised plan: Interior insulation and high insulated glass façade system with passive house windows. Additional insulation on the roof

8 Overall design strategy, technical installations LIGHTING SYSTEM T8 changed to T5. Installed demand controlled lighting HEATING SYSTEM. Existing electric heater replaced by a air/water heat pump and replaced old electric ovens to more effective demand controlled ones COOLING SYSTEM Cooling tower and icewater machine replaced by heat pump/coolingmachine VENTILATION Constant airflow (CAV) replaced with demand controlled ventilation (VAV) with active supply air terminal devices. HOT WATER PRODUCTION The central heating is replaced with local hot water heating

9 Decision making process Items to describe - Termination of existing contract - Owner contacted Moderne Byggfornyelse (MB) to discuss options - Indoor air quality was poor so MB introduced GK Norge AS into the discussions. No tendering process! - GK AS launched the idea of combining improving indoor air quality and energy efficiency. - After several attempts to attract tenants, it was concluded to expand the renovation concept to include a new façade. - The three key partners in this project had an informal and trustful cooperation. Opened for pragmatic solutions during the process. - MB and GK were also the given the responsibility for all planning. These companies hired advisers and architect based on their needs. - Grant from Enova: 0.6 m Idea was born September 2009 First brief project description completed June 2010 Detailed project description completed August 2012 (incl new façade) Tendering process started No tendering process Signing of contract with main contractor August 2012 Start renovation First part: August 2010 Renovation of outer façade completed Fall 2013 Interior adapted to tenants completed

10 Energy performances Energy performance (kwh/m 2 ) Total Delivered Energy: Before: 244 kwh/m² After: 80 kwh/m² Total Calculated Net Energy Demand*: Before: 220 kwh/m2 After: 64 kwh/m2 Energy cost Before: EUR After: EUR. Primary energy consumption The energy supply is electrical energy and preheated supply air with heat pump. *Norwegian standard including standardized internal loads RENOVATION COSTS - Total cost 14,4 mill EUR + tax - Split between extra investment for energy savings - Additional cost, upgrading to EBPC class B estimated to 1 mill EUR + tax - Subsidized products for demo: No FINANCING MODEL (EUR) Enova Loan Equity 0,6 mill 11,2 mill 2,6 mill The Enova grant is on the basis of the first action, with energy class B and low energy classification

11 Important factors IMPORTANT DRIVERS FOR INCREASING AMBITIONS IMPORTANT BARRIERS MAIN CONCLUSIONS Unattractive façade Poor indoor comfort (including noise) GK Norway strongly advocated for energy efficient solutions. Main Contractor has a green philosophy as part of their business concept The building was empty. Informal decision making processes built on trust between the main actors. Focus on good solutions. Limited financial resources and no signed contracts. All key actors considers it as a success Energy efficiency is no standalone sales argument but façade is and indoor air quality is! Energy efficiency may very well be achieved by combining good functions and attractive design in a systematic way. Decisions influenced by interest/values of individuals, business philosophy and single events. More pragmatic process as there was no tendering of contractors

12 Summary SUMMARY OF THE RENOVATION The tenant terminated the contract. Empty building; opportunity and "pain". Important to attract serious and long term tenants. Total cost: EUR 14.4 m Employees in the building Before renovation: 300 After renovation: 450 Space before: 10,386 m2 Space after: 10,886 m2 Delivered energy: Before renov: 244 kwh/m2/year First planned: 96 kwh/m2 year Final plan: 80 kwh/m2 year All the key actors consider this as a successful project, despite the experiences throughout the process This experience shows that the benchmark for existing buildings is the standard of new buildings, which also means energy efficiency and good indoor comfort Energy efficiency is not a sales argument completely on its own. The facade had to be renewed in order to make the building attractive.