Storage tank unexpected behaviour

asked 2021-08-12 04:14:49 -0500

updated 2021-08-20 14:44:42 -0500

Hi All, I'm trying to use Water Heater as simply HW TES - Hot Water Thermal Energy Storage, that is it has no internal sources.

With 1-Mixed every seems fine

With 2-Stratified I've no Boiler energy consumption, Tank temperature progressively goes down, but as a miracle hot water radiator gives the requested heating rate output (please see attached screenshot).

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With 2-Stratified I've no heating consumption at all, but Unmet Load Hours are under control (simple ABUPS check, confirmed by Mean -air Temperature analisys of the unique room space , see the scheme here).

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I've no idea what is happening . It could be a tremendous bug ?

Did some of you already noticed this?

What do you think about?

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FYI, the stratified tank has undergone a lot of change between versions 8.6 and 9.2 (or so). Perhaps worth testing some different EnergyPlus versions to see if the results have changed?

shorowit's avatar shorowit  ( 2021-08-23 13:06:55 -0500 )edit