I came across a scenario that I feel using below approach advised by Hevacomp to add hot water cylinder to CWS would almost double the real CWS incoming supply/or booster set.
The attached approach ignores the diversity occurs at the point of sanitary fittings, which would only allow a fixed flow rate of the combined hot and cold water supply. By adding a continuous flow, the pipework will see the peak hot water demand as a single outlet constantly satisfied. I would think the correct way to add hot water cylinder feed by CWS, is to add max flow rate and 0 loading units (screen shot as below). That way, the pipework would be property size and flow rate would be accurately estimated.
Shidan,
The advice on our Wiki assumes that the diversity of each outlet in the HWS has already been taken into account when sizing a separate HWS Netsys project.
I should also mention that using a Loading Unit of zero will simply cause the software to revert to using the Continuous flow value.
Which option to use is a design decision for each engineer, however we advise against using very large loading units in such cases as we have found in many instances that this will cause very unrealistic results.
Shane Regan | Principle Building Performance Support EngineerHevacomp to OpenBuildings - A complete guide for every user | Bentley Communities