Transient Thermal Performance Prediction of the Lunar Module Environmental Control System

1969 ◽  
Author(s):  
H. R. Howell ◽  
J. L. Williams
Keyword(s):  
Control System ◽  
Thermal Performance ◽  
Performance Prediction ◽  
Environmental Control ◽  
Transient Thermal

scholarly journals Influences of Different Architectures on the Thermodynamic Performance and Network Structure of Aircraft Environmental Control System

Entropy ◽  
2021 ◽  
Vol 23 (7) ◽  
pp. 855
Author(s):  
Han Yang ◽  
Chunxin Yang ◽  
Xingjuan Zhang ◽  
Xiugan Yuan
Keyword(s):  
Information Theory ◽  
Graph Theory ◽  
Control System ◽  
Heat Exchanger ◽  
Thermal Performance ◽  
Network Structure ◽  
Theoretical Basis ◽  
Environmental Control ◽  
Analysis Method ◽  
Thermodynamic Performance

The environmental control system (ECS) is one of the most important systems in the aircraft used to regulate the pressure, temperature and humidity of the air in the cabin. This study investigates the influences of different architectures on the thermal performance and network structure of ECS. The refrigeration and pressurization performances of ECS with four different architectures are analyzed and compared by the endoreversible thermodynamic analysis method, and their external and internal responses have also been discussed. The results show that the connection modes of the heat exchanger have minor effects on the performance of ECSs, but the influence of the air cycle machine is obvious. This study attempts to abstract the ECS as a network structure based on the graph theory, and use entropy in information theory for quantitative evaluation. The results provide a theoretical basis for the design of ECS and facilitate engineers to make reliable decisions.

TRANSIENT THERMAL PERFORMANCE PREDICTION METHOD FOR PARABOLIC TROUGH SOLAR COLLECTOR UNDER FLUCTUATING SOLAR RADIATION

2016 ◽  
Vol 78 (5-9) ◽  
Author(s):  
Tohru Suwa ◽  
ShyeYunn Heng
Keyword(s):  
Heat Flux ◽  
Solar Radiation ◽  
Thermal Performance ◽  
Performance Prediction ◽  
Solar Collector ◽  
Solar Thermal ◽  
Design Stage ◽  
Parabolic Trough ◽  
Exit Temperature ◽  
Transient Thermal

As the effect of the global warming is becoming noticeable, the importance for environmental sustainability has been raised. Parabolic trough solar thermal collector system, which is one of the solutions to reduce the carbon dioxide emission, is a mature technology for electricity generation. Malaysia is a tropical country with long daytime, which makes suitable for solar thermal applications with parabolic trough solar thermal collectors. However, the high humidity causes the solar radiation to fluctuate. In order to simulate the solar thermal collectors’ performance at an early design stage of solar thermal power generation systems, fast still accurate transient thermal performance prediction methodis required. Although multiple transient thermal simulation methodologies exist, they are not suited especially at an early design stage where quick but reasonably accurate thermal performance prediction is needed because of their long calculation time.  In this paper, a transient thermal prediction method is developed to predict exit temperature of parabolic trough collectors under fluctuating solar radiation. The method is governed by simple summation operations and requires much less calculating time than the existing numerical methods. If the radiation heat loss at the parabolic trough collector tube surface is small, the working fluid temperature rise may be approximated as proportional to the receiving heat flux. The fluctuating solar radiation is considered as a series of heat flux pulses applied for a short period of time. The time dependent solar collector exit temperature is approximated by superimposing the exit temperature rise caused by each heat flux pulse. To demonstrate the capabilities of the proposed methodology, the solar collector exit temperature for one-day operation is predicted. The predicted solar collector exit temperature captures the trend of a finite element analysis result well. Still, the largest temperature difference is 38.8K and accuracy is not satisfactory. Currently, the accuracy of the proposed method is being improved. At the same time, its capabilities are being expanded. 

Thermal performance prediction of a solar hybrid gas turbine

Solar Energy ◽  
2012 ◽  
Vol 86 (7) ◽  
pp. 2116-2127 ◽  
Author(s):  
G. Barigozzi ◽  
G. Bonetti ◽  
G. Franchini ◽  
A. Perdichizzi ◽  
S. Ravelli
Keyword(s):  
Gas Turbine ◽  
Thermal Performance ◽  
Performance Prediction

Computer Simulation of an Engine Environmental Control System

2013 ◽  
Vol 850-851 ◽  
pp. 355-358
Author(s):  
Dong Du
Keyword(s):  
Control System ◽  
Distribution System ◽  
Environmental Control ◽  
Cooling System ◽  
Flow Simulation ◽  
Aircraft Engine ◽  
Simulation Software ◽  
Temperature Decrease ◽  
Environmental System ◽  
Passenger Aircraft

This paper describes the use of Fluid Flow Simulation Software to model a passenger aircraft engine environmental control system. The analysis simulates the cooling pack and the engine distribution system in a single model.The engine environmental system is very important for engine working efficiently. Using AMEsim software to simulate the cooling system can make it easily and clearly. The influence of the heat component and the fan operating is studied also. Through the analysis of the cooling system, we know that with the help of fan, the system can get additional air in the radiator and make the temperature decrease consequently.

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