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The bottom head in the residential electric water heater tank is an externally-pressurized, thin-walled, torispherical structure.
The obtained curves of buckling pressure versus imperfections can provide guidance for water heater tank design and manufacture.
The buckling strength of a thin-walled torispherical head in a residential electric water heater tank was investigated by both experimental and finite element analyses.
Two parameters, contact imperfection ratio, Rimc, and geometry imperfection ratio, Rimg, were used to quantitatively characterize the magnitudes of the main imperfections in the water heater tank manufacturing process.
The computational results indicate that the storage tank volume to collector area ratio and the storage tank dimensions ratios have significant effects on the heater performance, while the height between the heater tank and collector has little effect.
Good agreement between the test and finite element results shows that finite element models used in this paper are viable to predict the buckling pressure of a thin-walled torispherical head in a water heater tank.
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The obtained results provide reference for the design and manufacture of water heater tanks.
The shapes of four randomly selected water heater tanks were measured by Computer Aided Inspection (CAI), and hydrostatic tests and strain measurements were performed.
Three water heater tanks pressurized with water were tested, and the strains on the heads and the pressure variations were measured and recorded.
Specific sampling locations in the apartments included showerheads, sink faucets in kitchens and bathrooms, and water heater tanks (n = 56 samples).
Equipment includes a thermometer, hydrometer, under-tank heater, in tank heater, pumps, filters, etc. Add substrate.
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