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Thermal performances of water heaters in series

Authors
Journal
Applied Energy
0306-2619
Publisher
Elsevier
Publication Date
Volume
52
Issue
1
Identifiers
DOI: 10.1016/0306-2619(95)00014-j

Abstract

Abstract The thermal performance of a single-tank electric water heater is compared with that of a dual-tank electric water heater for the same average domestic hourly hot-water use pattern. Both water heaters have the same total power rating and volume capacity. However, the power rating and volume capacity of each tank in a dual-tank water heater are varied to find the best combination in terms of total hot-water output and energy saving. It is found that using two tanks connected in series provides about 10% more hot water at the required temperature while requiring about 4·5% less energy when the second tank has 10–30% of the total volume and 70–80% of the total power rating.

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