RETROFITTING OF FLATS WITH CLIMATIC FACADES AND CONSERVATORIES

Objetivo

48 dwellings in small apartment buildings in Tilburg (Reitse Hoeve : erected in the '50s) are to be retrofitted by means of additional climate facades ("klimaatgevel", registered trade mark) and conservatories (sun rooms). Energy savings are expected to reach 6.8 MWh per year per dwelling due to additional insulation (5 MWh), conservatories (1 MWh) and pre-heating of fresh air (0.8 MWh). The remaining heat requirement (7 MWh) should be met by the heating plant. This means approximately energy savings up to 50%. At the (small scale) project level investment cost should amount up to 20,000 HFL (8800 ECU) per dwelling thus giving a rough payback time of 30 years. This ratio would be significantly reduced if the "klimaatgevel" is produced on a large commercial basis.
Detailed results are not yet available, but a gross analysis of the gas consumption over the second half of 88 shows a possible saving of 50 %. The measurements are handicaped by the soft winter and the different life-styles of the occupants of the test flats.
1. THERMAL INSULATION
The "climate facade" (R) is fitted with minimal 100 mm insulation material. The maximal insulation thickness amounts to 150 mm.
The windows on the gallery facade (north) are provided with thermally insulating shutters. The garden facade (front) has got large surfaces of masonry, which need to be replaced as yet. Insulating the cavity walls is risky, because of cavity wall pollution and the present cold bridges near the floors. By placing a simplified form of the climate facade (R) in front of the masonry, a high insulation value can be reached without building-physical problems. Maintenance to masonry (renewal of pointing) need not be carried out.
2. THE VENTILATION AIR COLLECTOR
The supply of ventilation air on the garden facade (south) runs through the ventilation air collector. The air is preheated in the collector before coming into the house. The transmission near the facade is limited when the air streams along it into the house.
Depending on the temperature in the facade collector and the draught in the natural ventilation-channels, more or less air will stream into the house. Due to the height of the collector (2 meters) the natural thermal draught is sufficient to regulate the air supply into the room. On the upperside there is a reverse-valve. The air either streams into or out of the house in order to prevent that the air-stream is halted (which may be the case with an open/close valve) and that the temperature rises too high. By applying a reverse-valve this is avoided.
3. THE SUN-ROOM
The sun-room element is added in order to obtain a better passive use of solar energy. The useful value of the balcony is increased in this way and more and longer use can be made of it. The south-east side is totally made of glass and can be opened in summer. The south-west side is partly closed. This has been done to prevent over-heating in summer. Vertical glass admits sunshine in winter.
In summer the sun intensity on the glass falls, due to the sun's altitude, so that over-heating in summer is limited.
On behalf of permanent ventilation a small flap-window is installed in the upper part of the sun-room. The sun-room functions as a buffer-zone between the house and the outside area. The transmission losses are thus reduced.
4. The project includes 4 phases :
. phase 1 : project management, specifying energy-elements, final design and specification
phase 2 : working drawings, building (= retrofitting) supervision and project-management
phase 3 : monitoring and analysis before houses will be used; retrofitting of pilot flat.
phase 4 : monitoring, analysis, evaluation and final report.
5. The proposed automatic control seems to be rather complex and difficult to understand by the
occupants of the flats.

Programa(s)

ENG-ENALT 2C - Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985

Tema(s)

3.1 - BUILDINGS

Convocatoria de propuestas

Data not available

Régimen de financiación

DEM - Demonstration contracts

Coordinador

STICHTING WOON/ENERGIE

Aportación de la UE

Sin datos

Dirección

CRABETHSTRAAT 38 J
2801 AN GOUDA
Países Bajos

Coste total