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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.27 no.4 (2000), pp. 075-078
A Combined Heating and Cooling System Using Entirely Solar Energy
P. Vitanov1, St. Stamov2, D. Velkov1, M. Zlateva2, N. Tyutyundjiev1
1Central Laboratory of Solar Energy and New Energy Sources Bulgarian Academay of Sciences, Blvd. Tzarigradsko shaussee 72, 1784 Sofia Bulgaria
2Technical University – Sofia, Department of heating and refrigerating techniques
go back1Central Laboratory of Solar Energy and New Energy Sources Bulgarian Academay of Sciences, Blvd. Tzarigradsko shaussee 72, 1784 Sofia Bulgaria
2Technical University – Sofia, Department of heating and refrigerating techniques
Abstract. An original technical solution is described for providing space heating and cooling using entirely solar energy. The principal thermal element is a heat pump fed by a photovoltaic (PV) system. This combined installation allows up to 45% of the incident solar energy to be converted into heat even under winter conditions.