TY - JOUR
T1 - Revisiting radiant cooling
T2 - condensation-free heat rejection using infrared-transparent enclosures of chilled panels
AU - Teitelbaum, Eric
AU - Rysanek, Adam
AU - Pantelic, Jovan
AU - Aviv, Dorit
AU - Obelz, Simon
AU - Buff, Alexander
AU - Luo, Yongqiang
AU - Sheppard, Denon
AU - Meggers, Forrest
PY - 2019/3/4
Y1 - 2019/3/4
N2 - In this study, we enhance the understanding and design of a radiant cooling technology for outdoor comfort in tropical climates, originally proposed by R.N. Morse in 1963, in this journal. We investigate a type of radiant cooling methodology whereby the cold temperature source is physically separated from the outdoor environment by an insulated enclosure using a membrane transparent to infrared radiation. The enclosure isolates the radiant cooling surface from ambient conditions, allowing the radiant surface to be cooled significantly below ambient dew point temperatures without incurring condensation. For this new study, a Fourier Transform Infrared (FTIR) Spectroscopy analysis on three candidate membrane materials is undertaken and a prototype experimental test panel is fabricated. Our study shows that for a 5°C chilled panel temperature, the exterior membrane surface temperature reaches 26°C in a 32°C / 70% RH environment resulting in an effective mean radiant temperature of 15.8°C. These results provide new evidence in support of Morse's original proposal, that such panels could provide significant radiant cooling without condensation in humid environments. Radiant cooling products based on the studied technology may offer an ability to provide thermally comfortable conditions in hot environments without the energy required for dehumidification.
AB - In this study, we enhance the understanding and design of a radiant cooling technology for outdoor comfort in tropical climates, originally proposed by R.N. Morse in 1963, in this journal. We investigate a type of radiant cooling methodology whereby the cold temperature source is physically separated from the outdoor environment by an insulated enclosure using a membrane transparent to infrared radiation. The enclosure isolates the radiant cooling surface from ambient conditions, allowing the radiant surface to be cooled significantly below ambient dew point temperatures without incurring condensation. For this new study, a Fourier Transform Infrared (FTIR) Spectroscopy analysis on three candidate membrane materials is undertaken and a prototype experimental test panel is fabricated. Our study shows that for a 5°C chilled panel temperature, the exterior membrane surface temperature reaches 26°C in a 32°C / 70% RH environment resulting in an effective mean radiant temperature of 15.8°C. These results provide new evidence in support of Morse's original proposal, that such panels could provide significant radiant cooling without condensation in humid environments. Radiant cooling products based on the studied technology may offer an ability to provide thermally comfortable conditions in hot environments without the energy required for dehumidification.
KW - Radiant cooling
KW - spectral analysis
KW - sub dewpoint
KW - thermal comfort
KW - thermal transparency
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U2 - 10.1080/00038628.2019.1566112
DO - 10.1080/00038628.2019.1566112
M3 - Article
AN - SCOPUS:85060910689
SN - 0003-8628
VL - 62
SP - 152
EP - 159
JO - Architectural Science Review
JF - Architectural Science Review
IS - 2
ER -