Study on strengthening the performance of direct absorption collector with spiral twisted tape
YANG Weilin
LONG Jie
ZHOU Liqun
Abstract：Aiming at the problem of uneven heating of working medium in direct absorption solar collector,it is proposed to insert spiral twisted tape in it to improve the temperature uniformity of nanofluid and increase the heat collection effi-ciency.Based on single-phase flow theory,the discrete coordinate radiation model is combined with computational fluid dynamics method to obtain the relationship between optical parameters and heat collection efficiency.The density,specific heat capacity and viscosity of the nanofluids were calculated using classical thermophysical model,and the optical pa-rameters of the nanofluids were calculated by Rayleigh scattering method.The effects of the number of segments,inlet mass flow rate,mass fraction of nanoparticles and irradiation intensity on the thermal performance of the direct absorption collector with twisted tape were discussed and compared with the traditional type.The results show that the temperature uniformity of the nanofluid is improved by interpolating the spiral twisted tape.
Keywords：spiral twisted tapecollectorheat transfer enhancemennanofluidnumerical simulation
Publication Date：2025-02-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 75-79 )