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[en] Highlights: • A new solar air heater collector using a phase change material. • Experimental study of the new solar air heater collector with latent storage. • Energy and exergy analysis of the solar heater with latent storage collector. • Nocturnal use of solar air heater collector. - Abstract: An experimental study was conducted to evaluate the thermal performance of a new solar air heater collector using a packed bed of spherical capsules with a latent heat storage system. Using both first and second law of thermodynamics, the energetic and exegetic daily efficiencies were calculated in Closed/Opened and Opened cycle mode. The solar energy was stored in the packed bed through the diurnal period and extracted at night. The experimentally obtained results are used to analyze the performance of the system, based on temperature distribution in different localization of the collectors. The daily energy efficiency varied between 32% and 45%. While the daily exergy efficiency varied between 13% and 25%
[en] Highlights: • Experimental study of the new solar air heater with latent heat. • Energy analysis of solar air heaters with and without latent storage energy. • The daily energy efficiency of the solar air heater with phase change materials is 33%. - Abstract: In the present work an experimental study is made to enhance the efficiency of a simple fabricated Solar Air Heater (SAH) by using the thermal heat storage. A rectangular cavity filled with a Paraffin wax is used as a latent storage unit. An experimental study of two similar designed solar air collector (with and without Phase Change Material), is carried out to evaluate the PCM unit importance. The results show that during the night the outlet air temperature of the SAH was enhanced with using PCM. The daily energy efficiency of the SAH without PCM reached 17%, while the daily energy efficiency of the SAH with PCM reached 33%.
[en] This paper deals with an experimental study of an inexpensive integrated solar storage collector (ISSC) of total aperture area of 2 m2, used for the providing of domestic hot water. The ISSC is characterised by an absorber matrix made up of a thin cement concrete slab which performs the function of both absorbing and storing of the solar thermal energy. Inside the concrete absorber was embedded a cooper pipe network. Outdoor experiments were carried out under varied environmental conditions for several days during three consecutive months (from November 2007 to February 2008). The experiments were carried out by measuring the climatic variables, temperatures in different parts of the collectors, and mass flow rates of water, during the test days. Based on these measurements, the behavior of the systems was analyzed by comparing exit temperatures, heat losses, and delivered useful energy. A detailed energy and exergy analysis was carried out for evaluating the thermal and optical performance, exergy losses as well as exergetic efficiency for ISSC under given operating conditions. Results shows that the integrated solar storage collector, having energetic and exergetic efficiencies of 32% and 23.5% respectively, provides acceptable stored thermal heat rate by supplying approximately 80% in domestic hot water requirements for a family composed of 5-6 persons. An economic evaluation was made considering the investment time recovery through the system. The results obtained from the ISSC system were compared with the results obtained from a high quality thermosyphon solar system composed of a flat-plate collector (with a total aperture area of 2 m2) and its corresponding insulated storage tank (200 l), tested at the same time.