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The performance of a solar water heater incorporating evacuated tubes was evaluated using a transient simulation program, TRNSYS. Simulations were performed for 60℃ of hot water load temperature and for 280 liter of daily hot water volumes and three 400 liter of storage tank volumes. Three patterns of daily hot water consumption profile were used in the present study (morning, lunch and evening). The results show that the increase in solar fraction depends on the load profile, as well as the collector efficiency coefficient. Hot water draw profile has a large effect on the performance of the SDHWS, the morning load profile has the highest solar fraction. The annual solar fraction of the system, at the weather conditions of Jinju is approximately 84% at lunch load pattern, the 280 kg of load volume, 400 kg of tank volume and the 60℃ of load temperature.Nomenclature†Corresponding authorTel.: +82-55-751-5312; fax: +82-55-757-5622E-mail address: jssuh@gnu.ac.kr: solar fraction: heat removal factor: solar energy acquired [kJ]: hot water energy demand [kJ]: auxiliary energy supplied to the system [kJ]: upper dead band temperature difference [℃]: lower dead band temperature difference [℃]: heat loss coefficient of absorber[W/m2℃]