Case Study: nZEC - New construction of 40 dwellings in Oxtorget, Värnamo, Sweden
Name of organisation: Finnvedsbostäder AB
Stage of development: completed
Year of finalization: 2006
Type of project: construction
Area: urban
Scale: group of buildings
Type of building: Apartment in a block of five or less stories
Number of units/dwellings: 40
Tenure: social rental
Street: Oxtorget, 331 34
Postcode:
City: Värnamo
Region/ County: Jönköping County
Country: Sweden
Last Update: 14.04.2015
Short Description
Oxtorget is built as a passive house with good insulation, windows and water saving measurements. There are green areas, recreation areas and schools within a walking distance and the town centre is easily available via the cycle way situated close by.
The houses are of two types, each containing 8 apartments; 2 houses of type A and 3 houses of type B. House A have 2 RK (rooms and kitchen) and 3 RK respectively. House B have 2 RK and 3 RK on one level. Apartments with 4 RK and 5RK are in two levels with an internal open staircase. The upper level includes an upper hall, bedrooms, wc/shower and a wardrobe. The hall has connection with the outdoors through the skylight window.
All the apartments have entrance enclosures and an additional uninsulated passage/doorway that during summertime serves as an airing area.
Key Elements
Certification
Passive house, solar energy.
Work with Residents
Individual metering and billing of hot water.
Funding
Investment support, support for solar energy.
Thermal Insulation
Conventional. Walls 0,095 (W/m²K), floor 0,09, roof 0,07, window 0,94 and door 0,60.
Air Tightness
Air sealing improvements in windows ducts etc.0,2 l/s/m2.
Windows and Shading
Triple paned. U-value median 0,94 W/m²K.
Ventilation
Mechanical ventilation with heat recovery.
Heating and Hot Water
Solar energy and wind power electricity.
Solar Thermal
Solar thermal totall 3 sq.m per apartment. For domestic hot water.
Other Renewables
Electricity from wind power.
Electricity Saving Products
Energy efficient suppliers.
Water Saving
Water efficient appliance.
Main Results
- The total consumption (electricity, hot water, energy, property) of purchased energy is 69 kWh/m2 and year at 22.6 degrees indoor temperature.
Lessons learned
- Finnvedsbostäder can now say that Oxtorget become a successful project with satisfied householder, a proud landlord, proud people and a proud owner, Värnamo Municipality.
- Oxtorget with Lindås project has inspired many to build passive houses. Finnvedsbostäder intends to build more passive and Värnamo municipality intends to build a Bruno Mathsoninspirerad preschool passive.
- We would recommend anyone who has a focus on energy efficiency to remember other important aspects such as accessibility, noise, air quality, light and shading.
Additional Information
Ms Therese Rydstedt
SABO - The Swedish Association of Municipal Housing Companies
E-mail: therese.rydstedt@sabo.se
Web: www.sabo.se