Tuesday, January 26, 2016: 11:15 AM-12:45 PM
The Great Debate
Chair:
Jeff S. Haberl, Ph.D., Texas A&M University
Sponsor: Historical Committee
CoSponsor: 04.01 Load Calculation Data and Procedures
This seminar reviews the peak envelope cooling loads in the U.S. and Australia and relates the historical development of the methods to the methods that are being taught to today’s engineers and architects, including: the Total Equivalent Temperature Difference/Time Average method (TETD/TA), Cooling Load Temperature Difference/Cooling Load Factor/Solar Cooling Load (CLTD/CLF/SCL) and Radiant Time Series (RTS) methods. The presentations include a brief history, as well as the advantages and disadvantages of each method.
1 History of Peak Envelope Cooling Load Methods in the U.S.
 |
Jeff S. Haberl, Ph.D., Texas A&M University |
This presentation provides a historical discussion of peak envelope cooling load calculation methods from the 1800s until the present. The discussion focuses primarily on U.S. analysis methods, and includes a discussion of the engineering-based methods that can be traced, either directly or indirectly to textbooks in the 1800s by Professor Eugene Peclet, at the College of Marseille in France, and Professor Hermann Rietschel, Professor of the Technical University of Berlin, Charlottenburg Germany.
2 Overview of Peak Envelope Cooling Load Methods Using the RTS Method
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Jeffrey Spitler, Ph.D., P.E., Oklahoma State University |
This presentation will discuss the development of the Radiant Time Series (RTS) Method for performing design cooling load calculations is derived from the heat balance method. In the current ASHRAE Handbook, the RTS method has replaced all other simplified (non-heat-balance) methods such as the Cooling Load Temperature Difference/ Cooling Load Factor/Solar Cooling Load (CLTD/CLF/SCL) method, the Total Equivalent Temperature Difference/Time Averaging method (TETD/TA), and the Transfer Function Method (TFM).
3 An Architect's Perspective of U.S. Envelope Peak Cooling Load Methods
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Walter T. Grondzik, P.E., Ball State University |
This presentation addresses an architectural perspective of the design cooling load calculation methods presented in the current ASHRAE Handbook. Earlier versions of these methods allowed architects to extract desirable design moves from the data presented--leading to the potential for better initial design decisions. The current methods, although representing an advance in accuracy, are generally not usable by an architect in conceptual or schematic design decision making.
4 Overview of Australian Envelope Peak Cooling Load Methods
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P.C. Thomas, Team Catalyst |
This presentation will provide a brief historical perspective of the air-conditioning industry and cooling load calculation in Australia. It will look at the landscape of education and course work available; and will also review the basis of most popularly used cooling load calculation software used in Australia. Finally it will address the question of “Is this where we want to be?”