Track: Fundamentals and Applications
Sponsor: 6.5 Radiant Heating and Cooling
Chair: Peter Simmonds, Ph.D., Fellow ASHRAE, Buildings and Systems Analytics, Marina Del Rey, CA

This research creates a single tool that includes all of the necessary algorithms to complete the tasks of calculating heat balance and radiant energy exchange in a space. This is particularly important for predicting the performance of spaces that incorporate radiant components, but is equally important to evaluating any space's passive performance during intermediate seasons. To properly assess the radiant exchange in a space the dynamic interactions of a space involving conduction, mass storage, radiant exchange between surfaces and convection heat transfer must be predicted.

1. The Theory and Background behind Radiant Performance Explorer/Heat Balance
Chip Barnaby, BEMP, Fellow ASHRAE, Retired, Lexington, MA
The primary tangible result of the project is the Radiant Performance Explorer/Heat Balance (RPEHB), a PC-based Windows application that calculates and displays comfort results for multiple positions within an arbitrarily shaped room. The technical heart of the work is development of a method that calculates view factors from an arbitrarily-positioned occupant to all surfaces of an arbitrarily-shaped space. The method supports any number of room surfaces, each with any number of child surfaces (e.g. windows or radiant panels). The space and its surfaces can be non-convex, so troublesome cases such as L- or U-shaped rooms can be analyzed.

2. Practical Applications of a Radiant Performance Explorer/Heat Balance Module
Peter Simmonds, Ph.D., Fellow ASHRAE, Buildings and Systems Analytics, Marina Del Rey, CA
The objective of this work was to produce a unified space analysis application that calculates and displays room conditions, heating and cooling loads (delivered by air-based and/or radiant systems) and mean radiant temperature (MRT). The inputs for RPEHB calculations will be room shape, construction, operational requirements (e.g. control set points) and design-day weather conditions. Preparation of geometric input data will be supported by import from 3D tools such as SketchUp. This presentation illustrates the practical applications of the RPEHB module.

Presented: Monday, January 22, 2018, 11:00 AM-12:00 PM
Run Time: 60 min.

This is a zip file that consists of PowerPoint slides synchronized with the audio-recording of the speaker (recorded presentation), PDF files of the slides, and audio only (mp3) for each presentation.