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Design flow rates for heating prioritised by DHW, heating not prioritised by DHW, and DHW in the common pipe sections are calculated separately, to .
To calculate the installation components (pipe sections, primary pump, storage tank, boiler, ...) it is however necessary to have one design flow rate and one thermal power. Therefor Hysopt has developed two methods to aggregate the flow rates and thermal power in the common pipes as explained below.
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In the graph below, the design flow rate of DHW and CH is shown as a function of the number of apartments. The CH flow rate, logically increases linearly as the number of apartments increases (blue solid line). The DHW flow rate increases non-linearly, as a consequence, the DHW flow rate at the upper apartments will be determining the flow rate, as the number of apartments increases the CH flow rate takes over. The maximum of both will be used for component calculation (pipe sections, primary pump, storage tank, boiler, ...). The design flow rates, thermal power and temperature regimes (CH and DHW) are shown on the labels below.
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Weighted average of central heating and total domestic hot water flow
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