Mark Eatherton, Executive Director Radiant Professionals Alliance [email protected] 877-427-6601 720-375-3107

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Low Temperature Radiant Cooling and Heating Primer

Breakout Session Category Residential/Hydronics

You can’t make this stuff up…

Learning Objectives • Objective 1 What is the difference between radiant and convective energy? • Objective 2 How important is the emitter when used with GSHP? • Objective 3 Is radiant cooling a real option? • Objective 4 What about the humidity control? 15

Acknowledgements • Slides provided by Radiant Professionals Alliance, a division of IAPMO • Thank you to IGSHPA for allowing us the opportunity to share our knowledge base with you, the members of IGSHPA. • Thank you to the staff of IGSHPA for their assistance in making this presentation happen.

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What is Radiant Heating? • A process by which energy leaves the surface of an object and travels to the surface of another (cooler) object in the form of electromagnetic waves • RPA FACT: Mean Radiant Temperature (MRT) is the primary factor addressing occupant comfort. • RPA FACT: The ONLY correct way to manipulate and control the MRT within a given space is to do so with hydronics. 17

Characteristics of Electromagnetic Radiation Air absorbs very little thermal radiation Thermal radiation can be partially reflected Objects with surface temperatures below 970°F give off infrared radiation that’s invisible to humans 18

Characteristics of Electromagnetic Radiation All electromagnetic radiation travels at the speed of light Thermal radiation is entirely different from nuclear radiation Thermal radiation is not responsible for all the heat released by a “radiant” panel 19

Mean Radiant Temperature

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Heat Loss of the human body

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Different methods of heat delivery

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Different methods of heat transfer

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How new is radiant heating?

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How new is radiant heating?

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Frank Lloyd Wright

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Frank Lloyd Wright

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Frank Lloyd Wright

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Various methods of hydronic radiant floor heating systems

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Recommended low temperature floor applications

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Slab-on-grade System

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Staple Down method in cementitious compound.

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Staple Down in gypsum

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Heat Transmission plates above floor.

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Suspended Tube below floor NOTE: Not recommended for low fluid temperature applications

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Staple Up from below floor NOTE: Not recommended for low fluid temperature applications

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Staple Up from below floor NOTE: Not recommended for low fluid temperature applications

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Engineered Structural floor.

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Temperature range of radiant systems

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Temperature range of heat sources

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Hydronic Ceiling and Wall Systems (Ideal low temperature applications) 41

Alternative methods of affecting the MRT within a given space

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Radiant wall plate system

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Radiant Ceiling details

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Hydronic Towel warming radiator

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Distribution methods

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Different Tubing Sizes

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Different Tubing Types

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Typical Tubing Layout

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Distribution Manifold

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Flow Control detail

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Control Wiring Schematic

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Heat Sources

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Various Boilers available (high temperature applications)

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Condensing Boiler

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Water Source Heat Pump

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Simple….

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Complicated…

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Radiant Cooling

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Conventional Roof Eye Pollution

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Hydronic Roof Eye Candy

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Radiant Cooling Can provide 100% of the Sensible energy removal needs. Can be done with any hydronic based radiant delivery system. Must incorporate a dew point controller to avoid condensation production. Will require minor air movement to control the latent energy portions of cooling loads 63

Controlling rH to avoid condensation

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Chilled Beam

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Future System

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Future System

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Future System

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Future System

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Do the math and do your homework. Join the RPA Be introduced to manufacturers who already have a cooling system design program in place. Reduce parasitic energy consumption by up to 50%! Deliver a greater comfort factor. 70

For more radiant cooling information, visit….

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JOIN the RPA

www.radiantprofessionalsalliance.org then click on JOIN button 72

Radiant, done right can be a very comfortable, and energy conserving proposition.

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Got Questions?

Mark Eatherton [email protected] Presenter Company Logo

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