SOLAR ROOF REPLACING CONVENTIONAL ROOFING SYSTEMS

Objetivo

The project aims to demonstrate that the conventional roof of a building can be substituted by a "solar" roof (roof integrated solar collectors) for every kind of building, at a cost which is competitive to the present conventional energy producing systems.
The thermal behaviour of the "solar roof" is fourfold :
- Active behaviour - summer :
The circulation of fluid through the absorber enables to heat sanitary water. During night time, the water cools down to 12 deg.C due to night long wave radiation.
- Active behaviour - winter :
If the temperature of the absorber is higher than the storage tank, water is circulated and heats the storage tank.
- Passive behaviour - summer :
The structure of the roof raises the temperature to 15 degrees above ambient, against 30 degrees for a conventional roof. This results in a passive cooling.
- Passive behaviour - winter :
The temperature in the collector is about 40 degrees above ambient, resulting in an inverse heat flow and reducing the heat needs of the building.
The project is realized in 3 different locations in Spain :
- industrial building in Madrid
- train station in Avila
- hospital in Murcia.
The same solar collector which is of an innovative design, is used in each of the locations. The collectors are a self supporting U shaped with fixed mirrors, concentrating the sunlight along a one axis east-west. The whole form is designed to enable a maximum sun concentration in wintertime and a minimal energy captation in summertine. The maximum temperature to be reached in stagnation conditions is less than 100 deg. C, which enables to use plastics. The reduction of thermal cycles will also lengthen the life time of the collector and simplify the design (no security values...).
As the collector can be used as a substitute for the existing roof. The heat losses are about half of a conventional roof. In summertime the solar cover will radiate heat by night.
As the collector can be used a substitute for the existing roof. The head losses are about half of a conventional roof. 1) Auditorium - Madrid
The solar system is integrated in a new construction of 4000 m2 divided in 3 floors; on the first floor there are a small theatre for 100 persons and 5 classrooms, on the second floor there are a big theatre for 700 persons and auxiliarie rooms and on the third floor there are 9 classrooms.
The heating/cooling system is designed to integrate 540 m2 of solar cover and two accumulators of 200 and 50 m3. Two water-water and three air-water heat pumps transfer the energy from solar cover to the building by radiating flooring and air.
The expected energy saving is 110.000 kWh/year, equivalent to 200 kWh per m2 horizontal collector surface. 2) Train Station - Avila
The solar system is applied to a train station building with 2 floors of 200 m2 each. The lower level is for tickets, waiting room, administration; the upper floor for 2 apartments. A first solar collector system of 240 m2 collector surface is installed as a roof on theplatform for the train adjacent to the building. The collectors are connected to a 1600 l water storage, and the heating system is a floor radiant heating. The auxiliary heating is by electricity at off peak periods.
The second system is a small waiting hall on the other platform with a 30 m2 solar collectors roof. No auxiliary heater is foreseen. Designed energy savings for these two systems is 47000 kWh.
3) Health Center - Murcia
It was designed to integrate a 450 m2 solar collector roof system in the building. The solar collectors are connected to a 60 m3 heat accumulator, and completed with two water - water heat pumps of 6 kWh each, another accumulator of 60 m3 and an automatic control control system. The expected savings are 82300 kWh, equivalent to 190 kWh/year per m2 of horizontal solar roof surface.

Programa(s)

ENG-ENDEMO C - Programme (EEC) of demonstration projects and industrial pilot projects (EEC) in the energy field, 1985-1989

Tema(s)

7.2 - THERMAL

Convocatoria de propuestas

Data not available

Régimen de financiación

DEM - Demonstration contracts

Coordinador

ENERCOM SA

Aportación de la UE

Sin datos

Dirección

C/SANTIAGO DE COMPOSTELA 64
28034 Madrid
España

Coste total