This paper presents an investigation into the various factors which influence the peak average inside air temperature of outdoor telephone switching cabinets. The primary goal is to determine which factors are important and to develop a correlation which will predict peak average air temperatures inside the cabinet under a variety of situations. A network of lumped thermal capacitances and resistances is used to model the transient thermal behavior of the electronics enclosure. Energy balances for each element are developed creating a system of ordinary differential equations which are solved using a fourth order Runge-Kutta method. The numerical model is verified by comparison to experimental data. A search of parameters which affect the thermal behavior of telephone switching cabinets is conducted. A sensitivity analysis is performed to determine the important terms. Parametric studies are conducted to develop a correlation which relates the internal cabinet air temperature to the important dimensionless parameters.

1.
Chu, R. U., Simons, R. E., “Heat Transfer in Electronic Equipment,” Heat Transfer in High Technology and Power Engineering, Hemisphere-Publishing, 106–130 (1987).
2.
Jacobs, M. E., “The Practical Limits of Forced-Air Cooling of Electronic Equipment,” INTELEC, Vol. 1, (1989), pp. 4.1–4.8.
3.
Juds, M. A., Chan, S. H., “Cabinet: A Lumped Parameter Computer Program for Multi-Compartment Vented Electronic Enclosures,” 1st ASME/JSME Conference on Electronic Packaging, Vol. 1, (1992), pp. 89–101.
4.
McKay, J., “Predicting Transient Air Temperature Rise in Outdoor Cabinets Containing Telephone Equipment,” Bellcore Technical Memorandum, TM-ARH-013463, January 26, (1989).
5.
Incropera, F. P., DeWitt, D. P., Fundamentals of Heat and Mass Transfer, 2nd ed., John Wiley & Sons, New York, (1985).
6.
Kraus, A. D., Bar-Cohen, A., Thermal Analysis and Control of Electronic Equipment, Hemisphere Publishing Corporation, (1983).
7.
Hoffman, J. D., Numerical Methods for Engineers and Scientists, McGraw-Hill, New York, (1992).
8.
James, M. L., Smith, G. M., Wolford, J. C., Applied Numerical Methods for Digital Computation, Harper and Row, New York, (1985).
9.
Fundamentals, American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), Inc., (1993).
10.
Duffie, J. A., Beckman, W. A., Solar Engineering of Thermal Processes, John Wiley and Sons, 1991.
11.
McKay, J. R., “Maximum Expected Solar Radiation on Outdoor Cabinets,” Bellcore Technical Memorandum, TM-ARH-014580, July 17, 1989.
12.
Heins, W. H., Montgomery D. C., Probability and Statistics in Engineering and Management Science, John Wiley & Sons, New York, (1990).
13.
Roy, R., A Primer on the Taguchi Method, Van Nostrand Reinhold, (1990).
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