Mean radiant temperature

Online educational resource on achieving indoor environmental quality with radiant based HVAC systems
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Mean Radiant Temperature (MRT) - Part IV
Copyright (c) 2011, Robert Bean, R.E.T., P.L.(Eng.) and

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Mean Radiant Temperature (MRT) - Part I: Introduction/theory
Mean Radiant Temperature (MRT) - Part II: Application of theory
Mean Radiant Temperature (MRT) - Part III: Spreadsheet tool for thermal bridging
Mean Radiant Temperature (MRT) - Part IV: Project examples & ASHRAE research
Mean Radiant Temperature (MRT) - Part V: Calculation example (REHVA GB #7)

Thermal Bridging and MRT

In addition to our discussions on bridging through wood framing members we'd be remiss if we didn't bring up the bridging through wall and floor intersections in commercial buildings. The best resource on this to date is ASHRAE Research Project 1365 - Thermal Performance of Building Envelope Details for Mid- and High-Rise Buildings produced by Morrison Hershfield. Bottom line is - thermal bridging affects the mean radiant temperature which has a intimate influence on human thermal comfort - fix the bridging and you solve a not so trivial part of the thermal comfort equation.

Aqua Tower Chicago under construction

Chicago's Aqua Tower during construction - note the slab extending out past the glass enclosure serves as a "conveyor belt" for transporting mass (moisture) and energy (heat) in and out of the building due to differentials in vapour pressure and temperature. Image credit: courtesy of Robert Bean, R.E.T., P.L. (Eng.)
Aqua Tower Chicago thermographic image Aqua Tower Chicago
Chicago's Aqua Tower viewed with and without thermography - as noted above you can see the energy flow into the slab extending out past the window enclosure. Images credit: courtesy of James D'Aloisio, P.E., Klepper, Hahn, Hyatt

Morrison Hershfield video on, "Thermal Performance of Building Envelope Details for Mid- and High-Rise Buildings".

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