The dimensions of the lair equipped with the hybrid solar system are: L=50m (length), l=10m (width), h=3m (height), V=1500m3 (see Figure 2). The front of the lair has the area A’=L*h=150m2 and is oriented towards South. The Trombe wall with an area of 100m2 divided into nine equal sectors of 12m2 each is on the South front. On the same front there are eight sections of Trombe walls each with a side of 0.3m, which have the role of ventilation shafts. On the sloping roof eight solar collectors (with the role of daily heating) are installed, each with a collecting area of 4m2.

On the ground, sided to the building, five hot water storage tanks and five solar stills are installed. The PV system is installed close to the solar thermal collectors on the roof.

1. solar air collectors, 2. Trombe wall, 3. storage tank, 4. solar water collectors, 5. sloping
roof, 6. fans for cold or warm air flow direction, 7. fans for air dispersion from solar
collectors, 8. expansion bowl, 9. metal foil spool, 10. solar still, 11. collecting water trough,

12. drinking water pond

Energy supplied by the solar hybrid system

For calculating the useful energy to be supplied by the solar hybrid system, the measurements concerning the meteorological and efficiency values of the energy chain are considered:

• Average solar radiation intensity in the plane of solar air collectors is <GR>=464W/m2

• Average solar radiation intensity in the plane of Trombe wall is <G’>=312W/m2

• Number of days in a favourable (for system operation) year is Z=120days

• Average time for daily sunshine is n=8hours, that means that yearly utilization time is T=3600Z*n=3.46*106s

• Average efficiency of air solar collector taking into account the electric energy consumed by the air drive turbine is p=0.43

• Average efficiency of the Trombe wall for delayed heating is r|2=0.14

• Efficiency of the storage tank is r|3=0.50 and it is heating water by AT=15°C

• The fluorescent lamps are working 4 hours per day

• The PV modules will supply for illumination the specific power of 1.6 W/m2

• The used energy to be supplied by the hybrid solar system is Qi, u=6075 kWh/year (air solar collectors)

• Q2,u=4198kWh/year (Trombe wall)

• Q3,u=86kWh/year (water storage tank)

• Q4,u=52.7kWh/year (solar still)

• Q5,u=1168 kWh/year (PV panels)

The total useful energy is Qt, u=11579.7kWh/year.