Thermal performances of water heaters in series

A. K. Kar and K. M. Al-Dossary

Applied Energy, 1995, vol. 52, issue 1, 47-53

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.

Date: 1995
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