Report-evaluation of multi-storey Low Energy Houses at Hertings Gård, Falkenberg
2010 (English)Report (Other (popular science, discussion, etc.))
The new residential buildings at Hertings Gård in Falkenberg are built and owned by the local municipal housing company, Falkenbergs Bostads AB (FaBo) during 2007-2010. It is a good example of when knowledge of Passive house technology combined with good energy planning and project management can result in multi-storey houses with energy rating under 50kWh/m2. The multi-storey houses at Hertings Gård have innovative solar air heating systems connected to the ventilation system that is quiet unique. The solar air heating system contributes to the buildings energy supply by preheating the ventilation supply air. (The solar air is part of another project in Energy in Minds). This evaluation is based on metered energy used for space heat, domestic hot water, electricity for building service and domestic electricity for two of the multi-storey houses during 2009, House 18 and 19. The result is presented as monthly uses and compared with initial project specifications and some other parameters. The total initial energy specifications set by Concerto/Energy in Minds and FaBo for the houses are almost reached. Results are for House 18 and 19, 76,8 and 77,5 kWh/m2. (Specification 75 kWh/m2) This is total use of purchased energy. (excl. lighting at parking lots, not corrected after Swedish statistical normal year.) If we exclude the domestic energy use, the results looks as follows, House 18 47,8 and House 19 45,9 kWh/m2.(Specification: 50 kWh/m2). The used domestic energy for 2009 is varying a lot (House 18 from about 650 kWh up to 6500 kWh) between the apartments and is in total roughly 20% more than was expected in the project. A conclusion is that domestic energy is most of all a result of the tenant’s individual needs and behavior. Another energy specification that is not fully reached is the electricity for building service which is slightly more than specified in the project. The efficiency of the ventilation system is analyzed (with Specific Fan Power, SFP=2,80) which is relatively high compared to recommendations in National Swedish building code. This is probably a consequence of the chosen ventilation system with functions such as individual indoor temperature control. This function needs a design of the ventilation system that causes more power drops and therefore also more power than a more traditional and centralized ventilation system. The energy used for domestic hot water (DHW) is about 26% lower than specified in the project. (14,75 kWh/m2, year vs 20 kWh/ m2, year). The metered average specific DHW use at Hertings Gård is 0,27 m3/m2 and year. This is just slightly over the average of about 128 000 German apartments with individual metering and charging of DHW (0,25 m3/m2 and year). Hertings Gård has individual metering and charging of DHW use and low-flush water taps which are contributing to this relatively low DHW use. What is also achieved at Hertings Gård is, at least when looking at the tenant’s answers in the completed survey, that it seems to be a valued housing for its comfort as well as in other quality aspects. Many tenants can recommend the housing to other people. In conclusion, Hertings Gård is a good housing for the tenants, most probably a good investment for the housing company and above all a good living for the environment and the climate.
Place, publisher, year, edition, pages
Halmstad: Högskolan i Halmstad , 2010. , 24 p.
Low energy houses, Falkenberg
Engineering and Technology Building Technologies
IdentifiersURN: urn:nbn:se:hh:diva-13998OAI: oai:DiVA.org:hh-13998DiVA: diva2:376495
ProjectsEnergy in minds