ANALYSIS OF A LOAD-SIDE HEAT-EXCHANGER FOR A SOLAR DOMESTIC HOT-WATERHEATING-SYSTEM

Testing is done of an unpressurized drainback system with a load-side heat exchanger. Analytical calculations for the heat exchanger effecti veness and three models for convective heat transfer coefficients from correlations are compared against the experimental data. TRNSYS simul ations were performed using the average effectiveness of 0.78 (the cal culated effectiveness varies from 0.68 to 0.95); the results compare f avorably with experimental results, indicating that a constant effecti veness is an adequate model for the system.