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ASHRAE Research Project 1383: Develop a Radiant System
Module for the Simulation and Analysis of Spaces and
Systems
Executive Summary
ASHRAE Research Project 1383-RP, Develop a Radiant
System Module for the Simulation and Analysis of spaces
and Systems, produced analysis procedures that allow
calculation and display of comfort conditions at any
point within a room. These procedures are implemented in
a PC-based application called Radiant Performance
Explorer (RPE), an enhanced version of the ASHRAE
Comfort Tool.
The project developed a method for calculating view
factors from an arbitrarily-positioned occupant to all
surfaces of an arbitrarily-shaped space. With this
general ability and knowledge of room surface
temperatures,
mean radiant temperature (MRT) can be
calculated for any occupant position. This in turn
allows derivation of common comfort measures, such as PMV and PPD. Other radiant values, such as radiant
temperature asymmetry, are also calculated. RPE displays
these results in a computer-graphics based visualization
screen.
RPE can import and display data generated by the 3D
drawing tool SketchUp, the public domain building energy
simulation application EnergyPlus, or other sources.
Export of comfort results is available. The project also
enhanced EnergyPlus to more flexibly model
controlled-temperature panels. In addition, the ASHRAE
Comfort Tool was improved in several ways.
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Example: 10m x 5m (32.8ft x 16.4ft) room
conditioned with a floor heating system operating at 28°C
(82.4°F), inside
wall surface temperatures calculated to 17°C
(62.6°F), glass
calculated to 15°C
(59°F), ceiling
surface temperature calculated to 18°C
(64.4°F)
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