SIMULATION OF A COMBINED SOLAR HEATING AND COOLING SYSTEM FOR A MIDDLE SIZE BUILDING IN GREECE

The performance of a combined solar heating and cooling system was studied for Mediterranean climatic conditions, using a detailed computer model and hourly weather data. The TRNSYS-CODE was used to model the solar system and the building. The weather data used are from Athens. A reference year based on long term averages was developed. The system consists of flat plate collectors, a LiBr/H 2 O floor area of 540 m 2 . Also the performance of evacuated tube collectors was studied for such systems. The results of the simulation show that high yearly useful collector output (more than 500 KwH/M 2 ) is possible with flat plate collectors. With evacuated tube collectors about 40% more. A rough economic analysis shows that one can expect fuel savings of about 19 USD/m 2 for flat plate collectors, with a solar fraction of 80%.