[BLDG-SIM] Radiant Heating/Cooling

[Laouadi, Aziz]

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.


A copy may be downloaded from: 
Laouadi, A. "Development of a radiant heating and cooling model for building
energy simulation software," Building and Environment, 39, (4), April,  pp.
421-431, Apr, 2004 
(NRCC-46099) 
<http://irc.nrc-cnrc.gc.ca/fulltext/nrcc46099/>


Thanks

Dr. Abdelaziz (Aziz) Laouadi
Research Officer
Indoor Environment Research Program
Institute for Research in Construction
National Research Council of Canada
1200 Montreal Road, Building M-24
Ottawa, Ontario, Canada, K1A 0R6
Tel.:  (613) 990 6868;	Fax:  (613) 954 3733
Email: Aziz.Laouadi at nrc-cnrc.gc.ca 
Web: http://irc.nrc-cnrc.gc.ca/ie/light/skyvision/

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