ASHRAE Journal - November 2021 - 56
SOLVING PROBLEMS
Column
Radiant Cooling
Conditioning People,
Not Rooms
INTERVIEWS BY MARY KATE MCGOWAN, MANAGING EDITOR
" Air is for breathing-not for heating and cooling, " according to researchers creating
a membrane-assisted radiant cooling technology that does not use air to create
comfortable spaces for occupants.
Forrest Meggers, Ph.D., Associate Member ASHRAE,
and his Cooling and Heating for Architecturally
Optimized Systems (CHAOS) lab team at Princeton
University, along with collaborators from the University
of British Columbia and the University of Pennsylvania
have been working on a membrane-assisted radiant
cooling technology, known as the Cold Tube, that circulates
chilled water through a radiant cooling panel.
With this technology, air in the conditioned space does
not come in contact with the chilled surface. Radiated
body heat from occupants passes through the membrane,
is absorbed by the panel and is carried away
by the chilled water, said Eric Teitelbaum, Ph.D., who
started working on this radiant cooling technology as
part of his Ph.D. research at Princeton University working
at the Singapore-ETH Centre.
" This process is a net heat loss-allowing your body
to stay cool from an energy balance perspective-and
removing the same heat from the body as would be
removed by air conditioning, " said Teitelbaum, an engineer
at AIL Research.
The researchers are proposing creating thermally
comfortable environments without depending on
air-based convective heat transfer as the only means
56
ASHRAE JOURNAL ashrae.o rg N O V E M B E R 2021
of comfort. Embracing these concepts requires a shift
in thinking about comfort, but it is fundamentally not
entirely different from the current industry thinking,
Teitelbaum said.
" If it is agreed upon that heat must be removed from
occupants to maintain thermal comfort, that is still
what our system accomplishes. Relying on radiant heat
transfer and not convection is a large shift with many
practical research questions still. But our initial promising
research campaign is initiating lots of future exciting
work, " he said.
Radiant cooling is often used in conjunction with airconditioning
systems for peak management. " We really
want to flip that and rely on radiant cooling primarily, "
said Teitelbaum.
How the Cold Tube Works
In the Cold Tube, the membrane insulates the cold
face of the panel from heat and humidity of the air while
allowing thermal infrared radiation through. The back
and sides are insulated with rigid foam insulation. That
front side is exposed to occupants, said Teitelbaum.
Separating the chilled panel surface from the ambient
air means the air is unable to heat the panel, so the
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ASHRAE Journal - November 2021
Table of Contents for the Digital Edition of ASHRAE Journal - November 2021
Contents
ASHRAE Journal - November 2021 - Intro
ASHRAE Journal - November 2021 - Cover1
ASHRAE Journal - November 2021 - Cover2
ASHRAE Journal - November 2021 - 1
ASHRAE Journal - November 2021 - Contents
ASHRAE Journal - November 2021 - 3
ASHRAE Journal - November 2021 - 4
ASHRAE Journal - November 2021 - 5
ASHRAE Journal - November 2021 - 6
ASHRAE Journal - November 2021 - 7
ASHRAE Journal - November 2021 - 8
ASHRAE Journal - November 2021 - 9
ASHRAE Journal - November 2021 - 10
ASHRAE Journal - November 2021 - 11
ASHRAE Journal - November 2021 - 12
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ASHRAE Journal - November 2021 - 14
ASHRAE Journal - November 2021 - 15
ASHRAE Journal - November 2021 - 16
ASHRAE Journal - November 2021 - 17
ASHRAE Journal - November 2021 - 18
ASHRAE Journal - November 2021 - 19
ASHRAE Journal - November 2021 - 20
ASHRAE Journal - November 2021 - 21
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ASHRAE Journal - November 2021 - 27
ASHRAE Journal - November 2021 - 28
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ASHRAE Journal - November 2021 - 33
ASHRAE Journal - November 2021 - 34
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ASHRAE Journal - November 2021 - 37
ASHRAE Journal - November 2021 - 38
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ASHRAE Journal - November 2021 - Cover3
ASHRAE Journal - November 2021 - Cover4
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