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Energies 2017, 10, 1873 Energies 2017, 10, 1873 10 of 12 10 of 12 10 of 12 Thermocouple number 6 (TC6) represents a temperature sensor placed nearest to the garage man Thermocouple number 6 (TC6) represents a temperature sensor placed nearest to the garage man doorT,hwehrmichoceoxuplaeinsumthbeegrr6ea(TteCr6t)ermeprersaetnutrseafltuemctpueartaiotunrseosnendsoayrsplwacheedrenewaorersktwtoatshpeegrafroargmeemdain door, which explains the greater temperature fluctuations on days where work was performed in the dthoeorg,awrahgicehdeuxrpilnagincsotlhdedgareyast.erThteemcpoerreatuermepfleurcatuarteioannsdonsudrfaaycsewtehmerpeewraotrukrewavsepraegrfeosrmaredsihnotwhen garage during cold days. The core temperature and surface temperature averages are shown in Figure 13. ginaraFgigeudrueri1n3g. coAldndainycsr. eTahsecoinrettemperature ainsdosbusrefarvcedtemwpitehraltiutrtleeavdeifrfaegresnacree wshiothwnthine Fciogruerea1n3d. An increase in temperature is observed with little difference with the core and surface temperature. Asunrifnacreetaesme ipnetreamtuprer.ature is observed with little difference with the core and surface temperature. Figure 13. Average sand‐bed core temperature and surface temperature. Figure 13. Average sand‐bed core temperature and surface temperature. Figure 13. Average sand-bed core temperature and surface temperature. Figure 14 compares the TRaNsient SYstem Simulation (TRNSYS) simulated temperature of the Figure 14 compares the TRaNsient SYstem Simulation (TRNSYS) simulated temperature of the sand‐-bed to the measured one. The difference between the maximum measured and simulated sand‐bed to the measured one. The difference between the maximum measured and simulated temperatures waassfofuonudndto tboe 1b5e%1, 5w%h,ilewthieleditfhferednicfefebretnwceebnetthweeaevnertahge maveearsaugredmaenadsusirmedulatned temperatures was found to be 15%, while the difference between the average measured and steimupleartaetdurtesmwpearsa4t.u7r%es. was 4.7%. simulated temperatures was 4.7%. Figure 14. Simulated sand‐bed temperature over time. Figure 14. Simulated sand‐bed temperature over time. Figure 14. Simulated sand-bed temperature over time. Thesasanndd-b‐bededsimsiumlautleadtetdemtpeemrapteuraetpuroefilpersohfoilwesslhesoswflsuclteusastioflnutchtuanattihoenobthsearnvetdhteemopbesreartvuerde The sand‐bed simulated temperature profile shows less fluctuation than the observed tpermofipler,atwuhreicphroisfileik,ewlyhicdhueistloikethlyedeuxepetorimthenetaxlpesryismtemntablesiynsgtetmhebrmeinagllythceorumpalleldy ctoutphledgtaoratghe. temperature profile, which is likely due to the experimental system being thermally coupled to the garage. The upward trend of the measured temperature compared to the simulated temperature in gTahreaguep.wTahredutrpewndarodftrheenmdeoafstuhredmteamsupreerdattuermepcoemraptuaredcotomtphaerseidmtuolathteedstiemuplaetreadtutreminpeArpatruilrtehirnu April thru May was due to the warmer than average weather experienced in Palmer, Alaska April thru May was due to the warmer than average weather experienced in Palmer, Alaska compared to the simulated TMY2 data for Anchorage, Alaska. compared to the simulated TMY2 data for Anchorage, Alaska. Energies 2017, 10, 1873PDF Image | Seasonal Solar Thermal Energy Sand-Bed Storage in Alaska
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