HWSR Circuit Resistance

The HWS Secondary Return pump sizing circuit resistance pressure drop always seems to be astonishingly low and can't be used with any confidence in pump selection (in fact the Hevacomp pump selector returns no results). Is this a common issue for users?

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  • Hi Paul, thanks for uploading your project. We have looked into the project inputs in depth and the return pump pressure is being minimised mainly due to the temperature constraints. Specifically the temperatures defined at your System Marker, and the surrounding temperature set in your pipe defaults.

    Firstly, I note a minimum circulation temperature of 55deg - please note that this is the temperature at the furthest outlet from the System marker, as apposed to at the cylinder. Please ensure this meets your requirements.

    By default the surrounding temp in the software Defaults is set to 10deg - in your project it has been set to 20deg. This, along with the insulation on your pipework, means that there is very little heat loss across the system.

    Shane Regan | Principle Building Performance Support Engineer

    Hevacomp to OpenBuildings - A complete guide for every user |  Bentley Communities

        

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