DYNAMIC METHOD FOR SOLAR COLLECTOR ARRAY TESTING AND EVALUATION WITH STANDARD DATABASE AND SIMULATION PROGRAMS

A measurement and evaluation method is described by which standard collector performance parameters can be derived directly from measured outdoor data. Standard programs with routines for multiple regression can be used for the parameter identification. A continuous flow is applied in the collector loop during the test. Data for the whole day can then be used. A one-node capacitance correction for dynamic effects and separate incidence angle modifiers for direct and diffuse radiation are essential for the accuracy of the method, The model is set up for thermal power output (and not efficiency). This forces the parameters to values that are suitable for prediction of long-term performance. The collector model and parameters correspond closely to those used in existing detailed simulation programs such as TRNSYS, WATSUN, or MINSUN. The method can be used as an accurate bridge between short-term testing and long-term prediction by simulation.