Trends In Dish-stirling Solar Receiver Designs

Diver, Richard B.; Andraka, Charles E.; Moreno, J.B.; Adkins, Douglas R.; Moss, Timothy

doi:10.1109/iecec.1990.747967

Cited by 12 publications

(8 citation statements)

References 17 publications

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“…These requirements have led to wrefluxlf receivers using phase-change materials (PCM8s) for indirectly transferring absorbed energy to the PCM condensing on the engine-head flowtubes. Diver et al (1990) reviewed dish-Stirling receiver designs, Mancini (1991) considered the effect of concentrators on receiver apertures, and Diver (1992) summarized recent work on reflux receivers.…”

Section: Introductionmentioning

confidence: 99%

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A direct-heating energy-storage receiver for dish-Stirling solar energy systems

Lund¹

1994

Intersociety Energy Conversion Engineering Conference

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Dish-Stirling 'solar receiver designs are investigated and evaluated for possible use with sensible energy storage in singlephase materials. The designs differ from previous receivers in utilizing axial conduction in the storage material for attenuation of the solar flux transients due to intermittent cloud cover, and in having convective heat removal at the base of the receiver. Onedimensional, time-dependent heat transfer equations are formulated. The steady component is solved subject to specified receiver thermal efficiency, and the transient cloud-cover component is solved with the Fast Fourier Transform algorithm. Inverse transformation result in the amplitudes and mode shapes of the transient temperature component. Nomenclature cross-sectional area, m2 surface area (TDL), m22 thermal diffusivity, m /s thickness of absorber, m absorber specific heat, J/kgK fluid heat capacity rate, W/K absorber inside diameter, m heat exchange effectiveness source flux axial variation FFT of g(7) source flux time-variation loss coefficient, W/m2K imaginary unit (J-1) transfer function conductivity, W/m-K length of absorber element, m number transfer units (kA/LCf) ratio (N/a cloud period (13 min.), s heat input, W, kW aperture radiation loss, W, kW aper. convective loss, W, kW qs absorbed source flux, W/m2 %,c constant flux (q,Q,,,/As) , W/m2 q, average loss flux, W/m2 r, ratio ( [T,,,-Tm]/[Tfi-Tm] ) s transform variable (it) T temperature, K T, reference temperature ( aDL2qs,c/kA = qoQsL/kA) , K t time, s tc time const. (L2/a = LMc/kA) , s V solution variable (8a2/A2G) X axial coordinate, m x nondimensional coord. (X/L) Greek: A (LJ [h,a~/k~] = LV' [hL/kb] ) 7 receiver thermal efficiency q receiver optical efficiency 8, average temp. ( ( T,-T,) /TR) 8,, fluid inlet temp. ( (Tfi-Tm) ITR) 8, variable temperature (Tv/TR) 8 transform of 8, P density, kg/m3 a Stefan-Boltzmann constant a transform parameter (JrCs) 7 nondimensional time (t/P)

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Section: Introductionmentioning

confidence: 99%

“…( 6 ) , now serves to define N' , with 0,(1) = r,8,, : where r, = (T,,, -T,)/(TfI -T , ) .For example, taking TL,, = 800 C, q = 0.9(Diver, 1990), T, = 20 C, and T , , = 450 C, result in r, = 1.81 and Ta(x) = T-+ (Tfi -Tm)rIea(x)/ea(l)t as shown in Fiq. 5 (also with Tf,…”

mentioning

confidence: 97%

A direct-heating energy-storage receiver for dish-Stirling solar energy systems

Lund¹

1994

Intersociety Energy Conversion Engineering Conference

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“…Sandia National Laboratories, together with the U. S. Department of Energy, has identified Stirling Dish-Electric systems as having potential to meet long-term program goals in solar energy [ 1]. In the solar dish-electric concept, a receiver absorbs energy reflected from a parabolic mirror which tracks the sun.…”

Section: Introductionmentioning

confidence: 99%

Structural analysis of a reflux pool-boiler solar receiver

Hoffman¹,

Stone²

1991

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“…In solar-only operation, a heat pipe acts as a "heat transformer," accepting the non-uniform concentrated sunlight from a parabolic dish and transferring the heat uniformly and isothermally to a Stirling engine ( Figure 1) [4]. The inside surface of the heat pipe absorber is covered with a porous structure saturated with liquid sodium.…”

Section: The Heat Exchanger and Pin Finmentioning

confidence: 99%

“…(3,9) D=SQRT (DVEC ( 1) * *2+DVEC (2 COORD (3,9) , COORDT (9,3 ) DIMENSION SQPT(7) ,TQPT(7) ,WGT(7) ,GPT(4) ,SWGT (4) DIMENSION DLH (2,9) , DGH(2,3 1 , RJ (2,2) , QNORM(3) DIMENSION G1H ( 9 ) , GlPH (9 ) DIMENSION UNORM(3) ,F(9) ,FP(9) ,NORDER (4,9) ,NODE (9 …”

Section: Coordt(jcic)=coord(icjc)mentioning

confidence: 99%