Nutikella aku toimivus ja termoelekriline energiakogumine külmades välitingimustes
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Kuupäev
2025
Kättesaadavus
10.09.2025
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Nutikellade akude töövõime langus madalatel temperatuuridel on levinud probleem
spordiharrastajatele. Käesoleva lõputöö põhieesmärgiks oli projekteerida ja ehitada
katseaparatuur ning selle abil uurida madalate temperatuuride mõju Garmin Forerunner
255 nutikella aku kestvusele ja funktsionaalsusele. Katseaparatuur võimaldas kontrollitud
keskkonnas simuleerida kehasoojust käel ja liikumist. Katsete tulemusena selgus, et antud
tingimustes ei erinenud nutikella aku tühjenemiskiirus (4…6% tunnis) oluliselt erinevatel
miinuskraadidel võrreldes toatemperatuuriga, viidates kehasoojuse olulisele rollile. Küll
aga täheldati madalamatel temperatuuridel kella füüsilise funktsionaalsuse (ekraan,
nupud) halvenemist. Lisaks hinnati samaaegselt MATRIX Prometheus termoelektrilise
generaatori (TEG) võimekust energiat koguda, mis näitas pingetootlikkust sõltuvalt
temperatuuride erinevusest, kuid genereeritav võimsus jäi tagasihoidlikuks.
The decrease in smartwatch battery performance at low temperatures is a common issue for sports enthusiasts. The main aim of this thesis was to design and build a test apparatus and use it to investigate the effect of low temperatures on the battery life and functionality of the Garmin Forerunner 255 smartwatch. The test apparatus allowed for the simulation of body heat and movement in a controlled environment. Test results surprisingly showed that the smartwatch battery discharge rate (4…6% per hour) did not differ significantly at various sub-zero temperatures compared to room temperature under these conditions, highlighting the importance of body heat. However, a decline in the physical functionality (screen, buttons) of the watch was observed at lower temperatures. Additionally, the capability of a MATRIX Prometheus thermoelectric generator (TEG) to harvest energy was evaluated simultaneously, demonstrating voltage generation dependent on temperature differences, though the generated power remained modest.
The decrease in smartwatch battery performance at low temperatures is a common issue for sports enthusiasts. The main aim of this thesis was to design and build a test apparatus and use it to investigate the effect of low temperatures on the battery life and functionality of the Garmin Forerunner 255 smartwatch. The test apparatus allowed for the simulation of body heat and movement in a controlled environment. Test results surprisingly showed that the smartwatch battery discharge rate (4…6% per hour) did not differ significantly at various sub-zero temperatures compared to room temperature under these conditions, highlighting the importance of body heat. However, a decline in the physical functionality (screen, buttons) of the watch was observed at lower temperatures. Additionally, the capability of a MATRIX Prometheus thermoelectric generator (TEG) to harvest energy was evaluated simultaneously, demonstrating voltage generation dependent on temperature differences, though the generated power remained modest.
Kirjeldus
Rakenduskõrgharidusetöö
Tehnotroonika õppekaval
Märksõnad
lõputööd, katseaparatuur, külmkapp, tühjenemiskiirus, madal temperatuur, liikumine