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Research Papers

Semitheoretical Model of an Evaporator to Reduce Design Cycle Time

[+] Author and Article Information
David Zietlow

 Bradley University, Peoria, IL 61625dzietlow@bradley.edu

Dan A. Spurgeon

 Caterpillar, Inc., 100 N.E. Adams, Peoria, IL 61602spurgeon_daniel_a@cat.com

J. Thermal Sci. Eng. Appl 1(3), 031005 (Mar 03, 2010) (6 pages) doi:10.1115/1.3202791 History: Received July 25, 2008; Revised July 16, 2009; Published March 03, 2010; Online March 03, 2010

Original equipment manufacturers are looking for ways to reduce the product development cycle. A tool to reduce this time in the design of air conditioning systems is introduced in this paper. This is done by using a semitheoretical model of each of the components of a system. The semitheoretical model has the advantage of reducing the number of geometrical inputs that need to be specified when compared with a “theoretical” model. This paper focuses on the most complex of the components—the evaporator. A tube and fin evaporator was successfully modeled and validated. The model was tuned using supplier component data (Luvata, 2005, Heatcraft Evaporator—Version 3.07.05.122 B-DHLEX.EVP) for the evaporator. The tuned accuracy of heat transfer rate and pressure drop, both air- and refrigerant-side, was within 5% over the range of conditions representative of air conditioning applications.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 3

Schematic illustrating input/output data for predictive model

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Figure 4

Validation in heat transfer rate model after tuning

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Figure 5

Predictive capabilities of the heat transfer model

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Figure 6

Design example showing influence of heat exchanger area on heat transfer rate

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Figure 1

Schematic of tube cross section

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Figure 2

Flow chart of modeling process. See Table 2 to ensure the operating conditions do not exceed that of the model.

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