Thermal Optimization of the ECS on an Advanced Aircraft with an Emphasis on System Efficiency and Design Methodology

971241

06/18/1997

Event
SAE Aerospace Power Systems Conference and Exposition
Authors Abstract
Content
Two methods for analyzing and evaluating the environmental control system on an advanced aircraft as described in this paper include the conventional first law energy conservation technique and the second law entropy generation minimization technique. Simplified analytical models of the ECS are developed for each method and compared to determine the validity of using the latter to facilitate the design process in optimizing the overall system for a minimum gross takeoff weight (GTW). Preliminary results have illustrated the importance of taking into account system optimization based on system (or component) efficiency. For instance, even though different values were obtained for the rate of entropy generation, the second law analysis of a shell-in-tube heat exchanger led to an optimum tube diameter of 0.12 in (3.05 mm) when both R-12 and R-114 were used as the refrigerant in the vapor cycle. However, further research is necessary to determine whether this second law approach is advantageous for the integrated systems design engineer.
Meta TagsDetails
DOI
https://doi.org/10.4271/971241
Pages
7
Citation
Tipton, R., Figliola, R., and Ochterbeck, J., "Thermal Optimization of the ECS on an Advanced Aircraft with an Emphasis on System Efficiency and Design Methodology," SAE Technical Paper 971241, 1997, https://doi.org/10.4271/971241.
Additional Details
Publisher
Published
Jun 18, 1997
Product Code
971241
Content Type
Technical Paper
Language
English