Effects of auxiliary heater on annual performance of thermosyphon solar water heater simulated under variable operating conditions

摘要: Abstract A thermosyphon solar water heating system with electric auxiliary heater was simulated using the TRNSYS simulation program. Location of heater, inside storage tank or connected in series between and user, studied TMY meteorological data for Los Angeles, California. Simulations were performed two different load temperatures (60 80°C) types daily hot volumes (250 150 l). Four consumption profiles used present study, namely; widely Rand profile, continuous, evening morning profiles. Also, is extended to cover effects thermal optical properties flatplate collector volume tank. The results show that if drawn on a schedule corresponding draw operates higher efficiency when located than outside When operated each other three schedules, however, better performance achieved by locating increase fraction depends profile volume, temperature setting, as well quality volume. values parameters FR(τα)n FRUL are changed from 0.8 16 kJ/h m2°C 0.6 30 m2°C, decreases approximately 40–50%.