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Annular thermosyphon or ATS was made from three concentric tubes with difference in diameter. An annular passage lying between an inner tube and a middle tube was evacuated and filled in with working fluid; therefore, a function of this annular passage was identical to that of the passage inside of ordinary thermosyphons. In order to assess possibility to apply the ATS on practical heat transferring...
In this paper the dynamic behaviour of the heat exchangers are studied using different control strategies. By experimentation the dynamic behaviour of the outlet cold water temperature for the change in hot water flow rate are observed and the values are simulated using MATLAB and the results are compared. The conventional PI and PID are implemented and the control strategies along with the tuning...
Remote labs that enable students to conduct real-world experiments at a distance using a computer and Web-based tools can be the only realistic method of performing practical experiments in the context of distance learning.
In this work the heat transfer of a spiral tube receiver exposed to concentrated solar radiation is studied theoretically. The simulations were performed using Fluent6.3.26 for two different sections at several Reynolds numbers: 100, 300, 500, 700, and 1000 to see the effect of the inlet velocity on the outlet temperature. The effect of the inlet temperature is also discussed by varying the inlet...
Computational Fluid Dynamics (CFD) is gaining much popularity for analyzing and designing heat transfer enhancement techniques for complex systems. CFD gives an insight into flow patterns that are difficult, expensive or impossible to study using traditional experimental techniques. However, the application of CFD depends on its accuracy and reliability. This requires the CFD code be validated with...
A shell-and-double concentric-tube heat exchanger is a new invention in heat transfer devices that is used for transfer of internal thermal energy between three fluids at different temperatures. The structure of the heat exchanger for this project is made of a shell which encloses sixty-six double concentric tubes. There are three inlets and three outlets for all the fluids. The typical shell-and-tube...
Shell and tube heat exchanger is an important process device in high-energy industry. In order to improve heat transfer efficiency and solve the fouling problem, a new type heat exchanger whose tube inserted with plastics rotors was designed in the study. Furthermore, theoretical analysis and experimental validation were performed for the exchanger inserted with 19–100 and 19–400 specification rotors...
Parabolic trough concentrators (PTC) are special kind of heat exchangers formed of parabolic curved mirrors that focuses the direct/beam radiation from the sun onto a heat collection element that runs through the focal line of the concentrator. The PTC has to be oriented in one of the existing tracking modes to track the beam radiation. The focused radiant energy from the sun is absorbed through the...
Heat exchangers comprise one of the largest cost drivers for Ocean Thermal Energy Conversion (OTEC) systems. Reductions in fabrication costs and improvements in performance are critical to successfully commercialize sustainable energy power plants using this low (∼20°C) ΔT resource. Heat exchanger (HX) units should maximize heat transfer per unit area (U value) while minimizing pressure losses, corrosion...
The domestic air coolers, which are cost effective, play a positive role in providing human comfort during hot weather. However the performance is dissatisfactory in the high humid regions. This project paves a way to investigate the performance of air cooler integrated with phase change material (PCM) by eliminating the problem of rise in humidity that usually encountered in the conventional air...
In recent years, the CHP has developed rapidly, but the unreasonable phenomena of using energy are widespread. In the CHP system, the heat exchanger of steam and water not only to be heat-exchange equipment of hot and cold flux, but also to be cold-source equipment of heating flux, it decides energy cascade use to be sure the parameters of the heat exchanger of steam and water. This paper researches...
This paper deals with some of the important aspects of the modelling of a recuperator plant which consists of four heat exchangers using an object-oriented multi-domain modelling approach. These new concepts use physically oriented connections and algebraic manipulations to enable the acausal modelling. The traditional and used approach are briefly compared. The described advanced concept is demonstrated...
Use of dimensionless numbers for expressing experimental results in forced convection is irrational since the independent variables are transformed into interdependent in dimensional analysis. Nusselt number expressed in terms of Reynolds and Prandtl numbers is found to give effect of tube diameter and specific heat in erratic manner. Correlations are presented for gases and liquids in terms of measured...
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