Laurentiu Fara1,

Romanian Solar Energy Society (SRES),
c/o Physics Department,

“Politehnica” University of Bucharest,
313, Spaiul Independentei, 060032,
Bucharest, Romania
e-mail: laurf@nare. renem. pub. ro

In stock raising the temperature of the water consumed by animals is from 15 to 20°C and the indoor air temperature is roughly 16°C. The air flows velocity for ventilation is roughly 3m/s. The lighting level is from 5 to 60 lx. The drinking water consumption of the personnel is roughly 80 litres/m2*day. These parameters could be reached during spring and autumn seasons using thermal or electrical energy supplied by solar systems with multiple functions.

This work took into account the specific results obtained by various authors for developing both solar thermal, PV/solar thermal and hybrid, which supply heat and electricity. The paper presents an energy and economic planning study concerning a solar hybrid system with multiple functions in stock raising, in the south-western part of Romania (Timisoara region). The system functions are indoor lighting, indoor air heating, air ventilation, water heating for animals’ use, water supply for farm staff.

Statistical experimental data regarding solar radiation and other meteorological parameters in the South-Western part of Romania.

The solar energy quantity which could be converted into other energy forms depends on:

• The number of clear (S) and cloudy days (N)

• Outside temperature (te)

• Solar radiation intensity (G)

The tilting angle towards the horizontal plane of the south-facing collecting surface, determines the component in the collecting plane of solar radiation intensity (GR). The quantities S, N, G, te, were measured hourly during four years by a team of the physics department of Timisoara Technical University. Daily, monthly and seasonal averages of these quantities were calculated. Solar radiation intensity was measured by an auto- compensating differential bolometer. This device is equipped with an equatorial which offers the possibility to measure solar radiation intensity on arbitrarily oriented planes. External temperature was measured with a normal Hg thermometer according to the meteorological norms. The statistical average values for spring and autumn months of the quantities S, N,Z=S+N, <te>m, <GR>m are presented below. The values of GR are given for the cases s=0 and s=60 grd. The quantity <te>seas shows the average value of the outside temperature during the two seasons. The quantity <GR>seas shows the average value of solar radiation during the two seasons.