![]() The effects of incorporating shuttle heat loss in the differential equations on the temperature and pressure of working gas and the overall performance of the Stirling refrigerator are analyzed. Air and nitrogen showed better cooling performance than helium and hydrogen mainly due to the higher mass flow rate. The contribution of this study also includes investigation of the effect of different working fluids (air, nitrogen, hydrogen, and helium), effects of losses (shuttle heat and mass leakage) that have a direct effect on the operating condition of the cooling machine, and parametric optimization. The validation results confirm that the proposed numerical model could be used to design a Stirling cycle refrigerating machine with reasonable accuracy. ![]() The model is validated both with an experiment conducted in the FEMTO-ST laboratory in refrigerating mode and by reversing the model to work producing engine so that the validation could be made with different theoretical models developed by other scholars so far. #GEDEON BE FOCUSED REVIEW CODE#The model is simulated using MATLAB code for Beta configuration FEMTO-60 Stirling engine operating as a refrigerator. Moreover, other power losses and heat losses are included as independent losses to evaluate the cooling production and associated COP. The model incorporates effects of shuttle heat loss and mass leakage loss to the buffer space directly to the differential equations of pressure change, rate of change of mass of gas in compression and expansion spaces, and mass flow rates across these working spaces. Hence, this dissertation presents the numerical modeling, simulation, experimental validation, and parametric optimization of an air-filled Beta type Stirling refrigerator for domestic application.The research shows that a non-ideal second-order numerical model called the modified simple model has been developed. The main goal of this study is to develop a precise thermodynamic numerical model that could predict the performances and provide means for further optimization. The Stirling machine is used in cryogenics but applications for domestic cooling are still underdeveloped. The Stirling cycle heat engine has a good potential for use in the future because of some advantages like external combustion, and fuel flexibility. The Stirling cycle machine has many successful applications as a prime mover and cooling machine. ![]() This is the essential mechanism for Gedeon streaming affecting the efficiency of the double-inlet pulse tube refrigerator, instead of the thermal loss due to the enthalpy flow carried by the Gedeon streaming itself. equivalent conduction heat flow rate due to entropy transportation. The results indicate that different temperature profiles inside the regenerator and the pulse tube, caused by Gedeon streaming at various flow rate, can substantially change certain energy flow rates, e.g. ![]() The discussions are focused on the characteristics of acoustic field, the impact of Gedeon streaming on the temperature profiles, and the energy flows at the cold heat exchanger. ![]() Simulations of a typical double-inlet pulse tube refrigerator for various Gedeon streaming have been conducted to analyze the interaction between the enthalpy flow rate delivered by Gedeon streaming and the local temperature inside the regenerator and the pulse tube. This paper addresses a different explanation of the mechanism behind the effect of Gedeon streaming on the efficiency of the double-inlet pulse tube refrigerator. Gedeon streaming can cause a considerable deterioration in the efficiency of a double-inlet pulse tube refrigerator, which is usually ascribed to the thermal loss carried by the streaming in the conventional view. ![]()
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