Ecological renovation of the building stock is one of the important problems together with construction of ecological new sites. In this part of the world, which has stabilized population, it should even be more emphasized than the new constructions. It is impossible to separate energy related elements from architectural elements. Spatial organization and architectural form are firmly interconnected with such factors as solar control, ventilation, insulation, location of (thermal) walls, surface properties and color. For ecological renovation these considerations are reference points;

I — The aim of the study is to show exemplary renovation of a social housing unit to be an ecological house in Batikent-Turkey. A financial model will support implication and comparative analysis on energy, water, and urban agriculture.

II — Batikent’ site is the biggest (third in the world) housing project implied in Turkey. Between 1981-1990, 50.000 houses were built in Batikent. Aspects ofecological design principles are applied in some district implications. But holistic approaches were not managed. After 18 years of living in the area, buildings needed renovation. “Ozgur Cooperative" is one of the most interesting district settlement projects in the area. It consists of 306 triplex units. Highlights of passive solar energy design and vernacular architecture approaches used in design.

III — Architect of the project in Batikent, with an expert team, plans to revise his own house as an experimental transformation to Eco-house. Objectives of the study are;

The Eco renovated house is an ecologically renovated dwelling that is 150 m2 and has two stories and a basement. Cubic dimensions of the building optimize heat load. Entrance, living, dining, kitchen and 2 bedrooms are located to access of Southeast wind. With addition of 2 greenhouses a tampon area in summer conditions created, to collect heat when needed. Greenhouse is at the centre of building. Its design eases to conduct desired air to other spaces via direct opening plus special details for conduction. That is living and bedrooms adjacent to greenhouse heat is collected and stored adjacently to the thermally linked spaces. Day to night closing and opening of shutters for windows, greenhouse is used to provide appropriate thermal comfort conditions.

Technical Aspects

■ To revise water system to separate grey water from sewage and collect rainwater.

■ On balconies and the garden there has been edible landscape and it will be revised.

■ Greenhouse will be constructed to connect inner spaces as a heat transferor.

■ Convert materials, finishing and appliances to be healthy, safe and economical ones.

■ Re examines insulation ofwalls, windows. Shutters will also be insulated.

■ Install heat collectors for heating, cooling and domestic heat water systems.

■ Earth pipes will be installed to supplement this above-mentioned system.

■ PV’s will be installed to supply electricity for domestic consumption.

Wind speed and the direction are appropriate to overcome the overheating problems during hot seasons while the solar energy is more than enough to supply the very small amount of space heating requirement during winter using direct gain windows. Ordinary flat plate photo thermal converter needs can easily supply domestic hot water.

The system sizing for the stand-alone PV installation is done by the procedure outlined in the book written by Green. The load is as follows: Solar radiation value for Ankara is 4 MJ/m2 — day; Total daily requirement of electricity is obtained to be around 2175 Wh/day.

The number of modules is calculated as 24. The inclination angle of modules is calculated to be min 15 Degrees. (Latitude 15 Degrees). The reserve capacity of the batteries is assumed to be 10 days, which is quite reasonable for sunny and arid regions. This calculation gives 18 batteries. Efficiency of lead-acid batteries is 80% nickel-cadmium batteries 70%. The cost for the solar panels; The modules $ 7200+Bateries $ 4000+Maintenance $ 2000=Total $ 13200. South and/or east facing direct gain windows can easily supply heating requirements during winter months.

Greenhouses attached to both south and north facades. Heating by thermal mass and cooling, edible landscape, creation of additional space and recreation are the aims of additional structures. Greenhouse shutters will be added for both summer-winter; day — night insulation. Green house will completely moved and become a garden in summer.

Insulation: Existing 2 cm insulation material is adjusted to be 5cm and sandwich brick wall. Roof insulated with 8cm Styrofoam. Existing single glazing is improved to be double, using the old wooden frame. Shutters repaired and inner faces are insulated by film. Existing thermal mass for some of the rooms might be effective in solving insignificant requirements of cool nights and hot afternoons.

Main structure was made out of concrete, the materials for renovation have been selected with aspect to renewable resources and re-used materials are mainly brick, wood and natural insulation materials such as prelate. Structures and attachments will be made with screws or studs, not nails, so that may be easily demented and parts used elsewhere. Lime mortar has been used to make it easy to take down the wall and to clean the bricks. First floor, windows and roof are made out of wood. All parts of the external walls and the roof are accessible for replacement of materials has aged.

Toilet solid wastes, kitchen and garden organic wastes, leaves roots are collected, stored and composed to be fertilizer in the edible landscape in and outside house. Grey water was connected to city sewers, after ecorenovation Bath and WC grey waters are collected in basement to be naturally purified and used in garden. Garden and greenhouse vegetation and trees are planted for household requirements: Edible landscape design according to their light, water irrigation requirements plus aesthetic and creative demands of the people living in the house. Evergreen trees obstruct prevailing wind direction. On south fruit trees planted.