Seasonal Solar Thermal Energy Sand-Bed Storage in Alaska

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Seasonal Solar Thermal Energy Sand-Bed Storage in Alaska ( seasonal-solar-thermal-energy-sand-bed-storage-alaska )

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Energies 2017, 10, 1873 Energies 2017, 10, 1873 Figure 2. Sunda Seido 5‐16 efficiency curve, image from Solartechnik [16]. Figure 2. Sunda Seido 5-16 efficiency curve, image from Solartechnik [16]. The efficiency curves for the Sunda Seido 5‐16 are shown in Equations (1)–(3). 4 of 12 4 of 12 The efficiency curves for the Sunda Seido 5-16 are shown in Equations (1)–(3). Absorber: Absorber: Gross: Gross: where Tm—mean fluid temperature (K) where η(x) = 0.736 − 1.78x − 0.0130Gx2 (x)  0.736 1.78x  0.0130Gx2 (1) η(x) = 0.478 − 1.16x − 0.0084Gx2  ( x )  0 . 4 7 8  T 1 . −1 6 T x  0 . 0 0 8 4 G x 2 (2) x=m amb G 2 SGo—larircroaldleiacntocres(hWea/mt a)water-glycol solution that, during normal operation, passes through a heat (1) ( 2 ) (3) Tamb—ambient temperature (K) Tm—mean fluid temperature (K) η—efficiency Tamb—ambient tempe2rature (K) G—irradiance (W/m ) η—efficiency xTm Tamb G (3) exchanger to heat the domestic hot water tank. When the domestic hot water tank is not calling for heat Solar collectors heat a water‐glycol solution that, during normal operation, passes through a heat the excess heat is sent to the sand-bed under the garage floor for heating. A schematic of the evacuated exchanger to heat the domestic hot water tank. When the domestic hot water tank is not calling for tube solar collectors and the thermal storage is show in Figure 3. Figure 4 gives solar radiation for heat the excess heat is sent to the sand‐bed under the garage floor for heating. A schematic of the evacuated tube solar collectors and the thermal storage is show in Figure 3. Figure 4 gives solar radiation for Anchorage, Alaska for the duration of the experiment. Anchorage, Alaska for the duration of the experiment.

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