Experiment Research On Solar Thermal Conversion With Sixteen Dish Concentrator

As the foundation of human existence and development, energy is the driving forcebehind the promotion of civilization and social development. With easier to access, solarenergy is the earliest renewable source developed. Based on the investigation of theadvanced researches, a volumetric porous absorber wih spiral coil was designed in thisthesis. Using optical software TracePro, we designed a secondary solar concentratorwith a high concentration ratio. Finally, the performance of the heat exchanger wasexperimentally validated.According to the structure of16-dish solar concentrator, a secondary solarconcentrator was designed and simulated with the presence of errors. Concentratingperformance of the secondary concentrator can not meet the test requirements. Anoptimum structure was obtained with adjusting the geometric parameters.The concentrating flux on the center of focal plane of16-dish solar collector wasmeasured. Comparing the heat fluxes with the optical window aggregator and with thesecond solar concentrator, some helpful conclusions were drawed.Heat transfer inside the receiver was studied with simplified model. The details ofmethod for solving equations and related important parameters used in the calculationwere discribed, and a theoretical solution was found with iterations.Temperatures of three points in the absorber were measured respectively, and adetailed analysis was done for the temperature trends for two different stages of the heataccumulation and ventilation. The problems in the experimental process were presented,some further suggestions were proposed.This study provides a theoretical method of structure design and efficiencyanalysis of the porous absorer. Some results can be used for the efficient heat exchangerdesign.