Case Study: nZEC - Energy refurbishment of 60 dwellings in Tuleviku Street, Rakvere, Estonia (UNDER MONITORING)
Name of organisation: EKÜL - The Estonian Union of Co-operative Housing Associations
Stage of development: completed
Year of finalization: 2012
Type of project: refurbishment
Area: urban
Scale: individual buildings
Type of building: Apartment in a block of five or less stories
Number of units/dwellings: 60
Tenure: shared ownership/cohousing
Street: Tuleviku
Postcode: 10a
City: Rakvere
Region/ County: Lääne Virumaa
Country: Estonia
Last Update: 23.02.2015
Short Description
The project was carried out because of high price for heat and uncomfortable indoor climate. Heating system was one pipe system with no possibility to regulate on the radiator level. Ventilation was designed as natural from windows, but due to the fact that most of the appartements have already changed windows the natural ventilation does not worked properly any more. Heating system was unbalanced and heat supply to the radiators was unstable. At the same time support scheme for renovation was available.
Scheme terms were connected with energy saving % compared with last 3 years consumption. Conditions - 35% investment support means 50% savings. Association general meeting decided to go on 35% investment support. Flat owners are in 50% pensioners with reasonable low income (about 300 EUR month). Conditions foreseen that renovation should consist from total insulation of all external walls (U value 0,2) and roof (U value 0,15), installation of windows with U value not higher than 1,1. Heating system should be regulated on the radiator level, ventilation should have heat recovery element, flat based system was decided to use. Renovation project was designed for these conditions.
Key Elements
Certification
Energy certificate.
Project Management
Monitoring service quality.
Work with Residents
Site visits together with community members.
Funding
Energy efficiency measure | Ir | Iee,brutto [€] | Iee,netto [€] | Life time [years] |
[€] | ||||
1 Additional insulation for all external areas (roof 200 mm, walls, basement with 150 mm of insulation) |
| 368 000 | 184 000 | 40 |
2 Replacement of all old windows (U value more than 2 replaced with U value less than 1,1) |
| 24 000 | 10 000 | 30 |
3 Heating system renovation from one-pipe system to two-pipe system with thermostatic valves. |
| 150 000 | 37 500 | 30 |
4 Heat recovery ventilation system installation (room based system) |
| 110 000 | 110 000 | 20 |
Total |
| 652 000 | 341 500 |
|
Running costs |
| 25 370 | 25 370 |
|
Simple pay back time |
| 26 | 13 | 30 |
Thermal Insulation
Thermal insulation system (insulation+cover), elimination of thermal bridges with full insulation.
Ventilation
Mechanical ventilation with heat recovery system on flat.
Monitoring
Click here to access the monitoring data on the HIVE Database!
Main Results
- The most important is that flat owners got comfortable living with high quality indoor climate and with the same annual expenditure like before renovation.
- The apartments value is higher and house main constructions are now protected and there is no thermal bridges.
- Ventilation system will use exhaust air heat, heat consumption is expected 50% less than before.
- The heat recovery technology Intelivent inverter heat recovery system is in use and first assessment of the first full year shows that people are satisfied with the system as there is fresh air now in the apartment and no mould an moisture anymore.
- Two pipe heating system with thermostatic valves on each radiator allows to regulate comfortable temperature in each room.
- Apartments are warmer now and there is no unbalance anymore in the heating system.
Lessons learned
The awareness of flat owners should be on the level before the refurbishment decision that they can understand the difference to live in not renovated and renovated apartment house.
Additional Information
Ms Anu Sarnet
EKÜL - The Estonian Union of Cooperative Housing Associations
E-mail: anu.sarnet@ekyl.ee
Web: www.ekyl.ee
