Objetivo It is intended to reduce the heating consumption for an old building with 80 apartments to 30% of the normal size by combined use of energy savings, low energy design and use of low temperature heating as basis for low temperature district heating.To obtain this it is necessary to give the house a maximum thermal insulation, and by combining this with heat recovery of ventilation air reduce the effect demand to 30% of the present level. This will at the same time make it possible to keep the size of the radiator system.Further, it is proposed to introduce a hybrid solar mainly on the south, east and west facing facades of the building, in a new and optimised way. This will combine a good insulation of the building with the possibility of pre-heating ventilation air and use the summer insolation to heat the domestic hot water. The project will be an important demonstration of a new technology which can be used in coming urban renewable planning.The project has clearly been a success and must be considered as the most important solar low energy retrofit project in the housing sector in Denmark for that period.Energy saving of 45% were achieved compared to a standard house.Environmental impact has also been realized by the reduced energy consumption.Economic viability:The simple payback period of the investment is 33 years. Excessively long. This is mostly due to the high cost of very thick facade insulation and the solar wall. If these costs had not been taken into account the pay-back period would have been 12 years. Based on the results of this project new similar retrofit projects are being considered.Replication:For the builder, the AAB housing association, the project has been a success and based on the good results they are interested to utilise a similar total energy optimisation for the other 3 housing blocks in the area. Detailed calculations with the Cenergia computer programme, Optibuilt has been made for the neighbour housing block C and the project description. Based on this project housing block C was integrated in the EU-Thermie target project proposal from the European Green Cities Network, a project that will be realised during 1998.When you want to utilise low temperature district heating for city areas with old housing blocks, it is often necessary to introduce a considerable increase of the size of the radiator systems and at the same time improve the distribution network. One reason for this is that it is often difficult to suggest changes of the facades of old housing blocks, even though they are often not insulated at all. This is primarily due to the architectural problem it is to find acceptable solutions for facade renovation and because their is many examples of bad looking facade renovation projects for old housing blocks.In the proposed project this is considered as a necessary challenge you will have to deal with in the future, and architects from Fennet Consult together with Cenergia have developed idea's of how to make an acceptable combination of facade insulation and super low energy windows. These idea's is combined with similar idea's from Germany through the German firms ITP and OKALUX.A calculated reduction of the heat and effect demand to 30% of normal, makes it possible to keep the size of the radiator system and at the same time make it possible to have a true low temperature district heating solution with 50/30 °C temperatures. In this way a new energy conservation concept is combined with an energy saving heat supply system in an optimised way.The low return temperature will also lead to lower heat losses of the district heating network and an improved efficiency at the cogeneration plant where the heat is produced. The project is used in a new district heating area of Copenhagen, which is based on heat supply from large cogeneration plants, as part of the CTR-system. A total energy design is suggested involving an optimised combination of solar heating design and savings of heat demand in the housing block including improved insulation and windows and use of low temperature heating. This is based on the normal return temperature of the near future as feed temperature and 30°C return temperature. All windows is changed to super low energy windows with low emission glazing and a heat loss factor of 0.9 W/m²C. The roof will have extra insulation of 200 mm mineral wool, in all 300 mm insulation. The main part of the facades to the court yard is covered with a 200 mm facade insulation system using Rockwool mineral wool covered with a layer of plaster. The solar gain of the facades is optimised by use of transparent insulation and hybrid solar heating design with pre-heating of ventilation air. Heat recovery of ventilation air is combined with this to reduce the ventilation heat loss. It is suggested to build a large part of the south facing facade in the court yard with low iron hardened glass as surface to the environment. Since calculations have shown that a hybrid solar heating design can be useful also on east and west facing facades an optimised distribution between south, east and west orientations will be made. Programa(s) ENG-THERMIE 1 - Programme (EEC) for the promotion of energy technology in Europe (THERMIE), 1990-1994 Tema(s) 2.1 - BUILDINGS Convocatoria de propuestas Data not available Régimen de financiación DEM - Demonstration contracts Coordinador AAB AFD. 23. Aportación de la UE Sin datos Dirección HAVNEGADE 29 P.O.BOX 1529 1020 Copenhagen Dinamarca Ver en el mapa Coste total Sin datos
