No abstract

：A solar thermal simulator is suitable for indoor experiments of solar receivers and reactors when solar insolation and weather conditions are not favorable. Moreover, due to the easy control of electric power input, the solar thermal simulator allows the adjustment of power input incident on solar receivers and reactors and thus the implementation of accurate experiments. We manufactured a solar simulator, which is comprised of three sets of a xenon lamp and an elliptical reflector. In order to serve as a test facility, optical characterization of the solar simulator via radiation heat flux measurement is a critical prerequisite. We applied the flux mapping method to measuring the heat flux distribution of the three lamps. We presented the measurement results in terms of the heat flux distribution, the peak heat flux, the power distribution, the maximum power, and the efficiency for electric power conversion into radiation power. Characterization results show that our solar simulator provides the peak heat flux of 3,019 kW/m 2 , the maximum power of 16.9 kW, and the conversion efficiency of 45%, additionally with a 10% operation margin for output increase.

A Monte Carlo simulation-based optimization of a SERS-based thermal neutron detector is aimed at improving detection efficiency for thermal neutrons. The moderator and collimator have been designed for a 241Am-9Be source to maximize the thermal neutrons flux in the irradiation area. Simulated thermal neutron detection efficiency can be increased to approximately 50.5% when polyethylene is added as neutron reflector and 10B enriched 4-MPBA is used. With Monte Carlo software GEANT4, the SERS-based thermal neutron detector has been proven to have almost no effect on original thermal neutron flux as well as the distribution and could be used for thermal neutron detection accurately.

Abstract：Co n c e n t r a t i o n e r r o r s c r i t i c a l l y a f f e c tt h e p e r f o r ma n c e o fs o l a rc o n c e n t r a t o r ,s o t h e i re v a l u a t i o n i s i mp o r t a n tt ot h ec o n c e n t r a t e ds o l a rp o we rt e c h n o l o g y . Ho we v e r , t h ee v a l u a t i o ni sv e r yc h a l l e n g i n gb e c a u s ee r r o r s o u r c e sa r ev a r i o u sa n dn o te a s yt ome a s u r ei n d i v i d u a l l y . Th e r e f o r e , t h ei n t e g r a t e de f f e c to fc o n c e n t r a t i o ne r r o r s i so f t e nmo r ei n t e r e s t i n ga n du s e f u lf o rl a r g e -s c a l ea p p l i c a t i o n s . I nt h ep r e s e n two r k , wea n a l y t i c a l l yi n v e s t i g a t e a n dc l a s s i f yv a r i o u sc o n c e n t r a t i o ne r r o rs o u r c e sa n dt h e ne x p l a i nt h a tt h ee f f e c to fv a r i o u sc o n c e n t r a t i o ne r r o r s c a nb er e p r e s e n t e di nt e r mso far o o tme a ns q u a r ev a l u eo fr e f l e c t o rs u r f a c es l o p ee r r o r .Wep r e s e n ta ni n d i r e c t a p p r o a c ht oa s s e s s i n gt h er e f l e c t o rs u r f a c es l o p ee r r o rb yc o mp a r i n gs o l a rf l u xme a s u r e me n td a t awi t hmo d e l i n g c a l c u l a t i o n s .We a p p l y t h e a p p r o a c h f o r s o l a r f u r n a c e s wi t h d i f f e r e n tt h e r ma lc a p a c i t y a n d i n v e s t i g a t e i t s a d v a n t a g e sa n dd i s a d v a n t a g e s .Key Words：집광( S o l a rc o n c e n t r a t i o n ) , 오차( E r r o r ) , 반사판 표면 기울기( R e f l e c t o rs u r f a c es l o p e ) , 플럭스 맵핑법( F l u xma p p i n gme t h o d ) , 광선 추적법( R a yt r a c i n gme t h o d ) 기 호 설 명 n :반사 표면 법선벡터 P :확률분포함수 R :난수 ( r a n d o m n u mb e r ) ζ :t a n θ,반사 표면 법선벡터의 기울기