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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 because of the diversity we apply, 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. In this method, 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.
This method is always used to aggregate DHW and CH on the primary side of an HIU within one dwelling. Why? Either the HIU is in DHW mode, either the HIU is in CH mode.
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