Thermal Resistance Network Method Research Articles

Inverse heat transfer analysis of multi-layered tube using thermal resistance network and Kalman filter

In this study, a hollow cylindrical tube with a coating layer on its inner wall was considered. The thermal resistance network method was employed to solve the heat conduction in the tube. Unknown heat flux on the inner wall of the tube was estimated from measured temperature on the outer wall of the tube by the recursive input estimation algorithm consisting of the Kalman filter and real-time least squares. Assuming various operating conditions, the performance of the model developed in this study was evaluated.

Experiments and Analysis of the Structure of Concrete Roof Insulation

In this study, the building roof heat insulation structure was experiment and analysis. The simple approximation of a theory of thermal resistance network of the heat insulating structure was analyzed. The finite element method is proposed to evaluate the thermal characteristics of building components. The comparison between the finite element method and the thermal resistance network method was conducted by testing the thermal resistance of a concrete hollow block. Through the analysis of finite element method, the thermal resistance network and experimental validated, it is concluded the finite element analysis not only to calculated accuracy requirements but also has application in the form of the type of hole, material composition, intuitive analysis results. In the absence of test conditions or thermal performance test is not required, it is recommended to use finite element method to analyze problems.

Review of fatigue in concrete marine structures. (Report): Price, W. I. J., Hambly, E. C. and Tricklebank, A. H.Offshore Technology Report No. OTH 87235, 1989, 106 pp

Current simulation for dry screw vacuum pumps fails to reflect the influence of heat transfer and component thermal deformation due to the lack of an effective simulation path. This paper proposes a novel simulation method based on the chamber model and thermal resistance network method, which integrally considers the influence of leakage, heat exchange as well as components’ temperature and deformation. First, the working process of dry screw vacuum pumps was analyzed and simplified to introduce the chamber model and thermal resistance network method. In detail, the chamber model was employed to predict the gas pressure and temperature in working chambers, and the thermal resistance network was introduced to simulate the component temperature by assuming rotors and casing only performing axial temperature distribution. Next, the detailed construction processes of the chamber model and thermal resistance network were presented. A simulation procedure was developed based on the iterative solution of the chamber model and thermal resistance network. Further, a specific case with detailed simulation setup, solution process, and experimental verification was given for a test dry screw vacuum pump. The results showed that the proposed simulation method performed a better agreement with the experimental pumping speed curve than the previous isothermal model and could effectively predict the component temperature under different inlet pressures and rotation speeds. Finally, the simulated results were further discussed to reveal the gas temperature, component deformation, and leakage process in dry screw vacuum pumps. The conclusions obtained could effectively guide the design and development of dry screw vacuum pumps.