[bldg-sim] Radiant Heating/Cooling

[Edward F. Sowell]

This is a claim made primarily by the industry making radiant
equipment. I have never seen convincing evidence. It has always
seemed to me to be a second-order effect at best.

Ed Sowell

>
>
> In your research with radiant heating cooling savings, have you found any
> energy "savings" that can be attributed directly to the use of
> the radiant
> system vs other systems (air supply in particular).  For example, I have
> seen some papers that note that the heating setpoint can be relaxed while
> still maintaining thermal comfort with a radiant system.
>
>
> At 10:47 07/04/2004, you wrote:
> >Dear All,
> >
> >For those interested in the simulation of radiant
> heating/cooling systems,
> >IRC has developed a semi-analytical model for integration in energy
> >simulation software that use the one-dimensional numerical modeling to
> >calculate the heat transfer within the building construction assemblies.
> >
> >The model combines the one-dimensional model of the energy simulation
> >software with a two-dimensional analytical model.  The advantage of this
> >model over the one-dimensional one is that it accurately predict
> the contact
> >surface temperature of the circuit-tubing and the adjacent
> medium, required
> >to compute the boiler/chiller power, and the minimum and maximum
> >ceiling/floor temperatures, required for local moisture condensation
> >(ceiling cooling systems), thermal discomfort (heating floor systems) and
> >controls.  The model predictions for slab-on-grade heating
> systems compared
> >very well with the results from a full two-dimensional numerical model.
> >
> >The model was implemented in the Canadian software HOT3000 and the UK
> >software ESP-r as a plant component. The implementation of this
> model in the
> >ESP-r program offers additional flexibilities to the radiant
> system designer
> >community, mainly:
> >·       Designers can use any control algorithm possible in
> ESP-r with the
> >new plant component (e.g.., use the flux or temperature control,
> and compare
> >their performance).
> >·       Designers can specify any number of radiant surfaces of
> the building
> >fed by the same or different heat source.
> >·       Designers can size realistic radiant systems, and get realistic
> >energy consumption (from the source side) and cost.
> >
>

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