online educational resource on radiant cooling
not for profit resource on radaint cooling systems
radiant cooling for thermal comfort


ASHRAE Learning Institute - Fundamentals of Radiant Heating and Cooling







ASHRAE Learning Institute
Short Course on the Fundamentals of Panel Heating and Cooling.
(c) 2005 ASHRAE, by
R. Bean, R.E.T. and 
B. Kilkis, Ph.D.

Residential Radiant Hydronics Design Certification Course







Heating Refrigeration Air Conditioning Institute of Canada
Residential Radiant Hydronics Design Certification Course (c) 2005 HRAI of Canada, by R.Bean, R.E.T.

Download Radiant Article







ASHRAE Journal Vertically Integrated Systems in Stand-Alone Multistory Buildings (c) 2005 ASHRAE by R. Bean, R.E.T., T. Doran, B.Olesen, Ph.D., and P. Simmonds, Ph.D, Download this article

More on radiant cooling from Energy Design Resources


Radiant based Cooling Systems and Equipment - Part III

The Total (Radiant) Heating and Cooling Comfort System.
(ala Geoff McDonell, P.Eng. LEED Ap)

There is a system for radiant based HVAC and its called a Total Heating and Cooling Comfort System. Some call it a hybrid or a combo system but these names don't describe what it is. What it is - is a Total Heating and Cooling Comfort System. 

All of the nitty gritty details are described in our sample schematics, courses and webinars but essentially you have heated and cooled water available to send into the floor/walls/ceilings to either absorb or release radiant energy for comfort conditioning and to raise or lower the ventilation air temperature for dehumidifying and supplemental heating and cooling using a dedicated outdoor air system or DOAS.

The Total Heating and Cooling Comfort System looks like the drawing below and in an average sized 2400 sf home would occupy less space than the equivalent kitchen area in the same home.

Total Comfort System with dedicated outdoor air system for dehumidification

So that is the short strokes on cooling with radiant. 

Keep the humidity down below 50% RH, keep the surface temperatures above 66 deg F and any cooled surface can then without condensing, absorb the following amounts of sensible heat based on a 76 deg F room temperature:

Cooled Floors can absorb ≈ 12 Btu/hr/sf of sensible heat.
Cooled Wall can absorb  ≈ 14 Btu/hr/sf of sensible heat.
Cooled Ceiling can absorb ≈ 19 Btu/hr/sf of sensible heat.
≈ means "approximately"

Click here for more details on radiant panel performance.

If your home has sensible loads greater than these value then you must improve your homes efficiency, or accept that occasionally the room will get warmer than 76 deg F or use the ventilation system to deliver supplemental cooling. All latent cooling must be done with the ventilation system.

If you have any other questions drop by the online help (see link) to ask our experts.

go to part I - click here Introduction
go to part II - click here, Controlling the Relative Humidity
go to part IV - click here, Radiant Cooling Educational Movie Clips
go to part V - click here, Featured Project, Manitoba Hydro Office Building

See some really cool graphics on how your body deals with heat.

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