[BLDG-SIM] Radiant Heating/Cooling

[Chris Jones]

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.
>
>
>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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Chris Jones, P.Eng.
14 Oneida Avenue
Toronto, ON M5J2E3
Tel. 416 203-7465
Fax. 416 946-1005 

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