NCM System type for LTHW Radiant Ceiling Panels

[Wasted Energy]

This must have come up before; but what NCM system type should be used to model LTHW radiant ceiling panels?

[Complex Potential]

I don't think there's a perfect match for that so I'd probably vote for using the normal radiator system type.

[Wasted Energy]

Yeah that's what I've gone for, but it's a bit frustrating because to my mind the building should benefit from a reduced heating load compared to radiators (which are of course convectors in reality), in a similar way as if the system was defined as underfloor heating.

Wasted

[Complex Potential]

Agreed. Although if the BRE ever implemented a methodology to allow for that system type it would probably specify that the notional building is treated exactly the same way (perhaps some general reduction in setpoint?)

[Wasted Energy]

Ah, but even if the notional building is treated the same way there is still a benefit in reducing the space heating load as this brings down the BER, which is a benefit in those situations where the client is under a planning requirement to implement 10 or 20% renewables, as it then makes that 10 or 20% requirement a smaller, and less expensive, absolute value to implement.

Wasted