This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Use of ECS-Conditioned Air for FLIR Avionics Thermal Control: Fighter Aircraft
ISSN: 0148-7191, e-ISSN: 2688-3627
Published July 01, 1990 by SAE International in United States
Annotation ability available
THIS PAPER IS directed to aircraft Environmental Control System (ECS) designers and is intended to provide insight into problems with the allocation of ECS chilled air for the thermal control of avionics systems. The basic thermal design concepts and design procedures used by Texas Instruments in the development of airborne military avionics systems are described. A recent FLIR system was selected as an excellent example of a system that requires the effective use of aircraft ECS-conditioned air to provide thermal control. This paper describes the manner in which the ECS-conditioned air is divided between two LRUs and the unique design problems afforded by each of these LRUs. This paper also contains a comparison between two methods of allocating cooling air to avionics systems. The method used on the example FLIR system allows the system to operate within the specifications and meet all of the stated design goals. Another cooling air allocation method in common use by aircraft ECS designers fails to meet the design goal at all design conditions. Provisions must be made in the design of future aircraft ECS to provide enough cooling air for the effective thermal control of FLIR systems which are unique among avionics systems. It is no longer adequate to regard a “kW” as “just another kW.” There are unique “kWs” in the avionics systems that must interface with the aircraft ECS.
CitationPrice, D., "Use of ECS-Conditioned Air for FLIR Avionics Thermal Control: Fighter Aircraft," SAE Technical Paper 901219, 1990, https://doi.org/10.4271/901219.
- Holman, J. P. 1986 Heat Transfer Sixth McGraw-Hill Book Co. New York 253 259
- Kays, W.M. Crawford M.E. 1980 Convective Heat and Mass Transfer Second McGraw Hill Book Co. New York 288 310
- Ozisik, M. Necati 1985 Heat Transfer, A Basic Approach McGraw Hill Book Co. New York 524 584
- Kays, W.M. London A.L. 1984 Compact Heat Exchangers Third McGraw Hill Book Co. New York
- Price, D.C. Schwartz G.J. VanAmberg David March 1986 “HTEX-HeaT EXchanger Design Code Documentation and User Guide,” Texas Instruments Incorporated, Defense Systems & Electronics Group, Aero/Thermal Technology Branch Technical Memorandum No. 86-64-012
- Neal, Meade May 1986 “CLDPLT - Coldplate Design Code Documentation and User's Guide,” Texas Instruments Incorporated, Defense Systems & Electronics Group, Aero/Thermal Technology Branch Technical Memorandum No. 86-64-028
- Blevins, Robert D. 1984 Applied Fluid Dynamics Handbook Van Nostrand Reinhold Company New York
- Marston Palmer Ltd. Wobaston Road, Fordhouses, Wolverhampton, England
- Noah-Howden, Inc. P.O. Box 4400, 2616A Research Drive, Corona, California, U.S.A., 91720
- Wyatt, W.G. Price D.C. Rutschman C.L. January 13 1989 “Procedure for the Design of Orifices for the Control of Cooling Air for Avionics Thermal Control,” Texas Instruments Incorporated, Defense Systems & Electronics Group, Aero/Thermal Technology Branch Technical Memorandum 89-64-003-002