How to recover Energy from your e.g. drinking water distribution systems, consider how much Energy is"destroyed" by using only throttling device...

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How to recover Energy from your e.g. drinking water distribution systems, consider how much Energy is"destroyed" by using only throttling devices in your distributions systems. A feasible solution might be: http://www.ers-pat.info/englisch/field-of-applications-for-pumps-as-turbine/