Temperature Distribution In Heat Exchanger Research Articles

Selected Aspects of Performance of Organic Rankine Cycles Incorporated Into Bioenergy With Carbon Capture and Storage Using Gasification of Sewage Sludge

Abstract The study aims to investigate the application of the organic Rankine cycle (ORC) in the bioenergy with carbon capture and storage (BECCS) using gasification of sewage sludge. The tool used in the investigation is the aspen plus software with refprop property methods for calculating fluid properties. The reason for this study is that a detailed analysis of the proposed BECCS process flow diagram indicates that a certain amount of waste heat is available in the exhaust gas from the high-to-intermediate pressure gas turbine. Some of this energy can be used by applying expansion in a low-pressure turbine, optionally by applying regenerative water heating, which is then redirected to the combustion chamber, or finally by incorporating the ORC into the main cycle. For the ORC cycle, different configurations are studied, with regeneration and using different working fluids. For the highest efficiency of the cycle, the regenerative heating of high-pressure water is applied and a suitable ORC working fluid with optimal saturation parameters and mass flow is selected. Such modified proposed BECCS power plant hybrid systems with ORC are compared to the reference case with lower pressure expansion. A study of the heat duty and temperature distribution in heat exchangers is carried out. Five ORC fluids were investigated, namely ethanol, refrigerants R236ea, R245fa, R1233zd(E), and water, which gave a net efficiency of the whole power plant of 39.71%, 40.02%, 40.26%, 40.34%, and 39.35% respectively, while the proposed BECCS reference case gave 38.89%.

Enhancing solar stirling engine performance through the use of innovative heat transfer fin shapes

One of the challenges in designing and optimizing solar energy systems is achieving maximum power and efficiency at the lowest cost. This study focuses on using heat transfer fins to enhance energy absorption in the heater section of a solar Stirling engine. To begin, we model a parabolic solar collector system, considering factors that influence the amount of heat transfer to the heater section of the Stirling engine. Next, we model the Stirling engine using the PSVL model, which accounts for factors such as gas leakage, the temperature distribution in heat exchangers, longitudinal heat loss, polytropic heat transfer in cylinders, and other effects. In this paper, we also propose modifications to the basic model and introduce heat transfer fins made of FGM, with unique geometry and variable thickness, on the heater section of the solar Stirling engine to increase the heat received by the working fluid. We perform a thermal analysis of the fins to evaluate their impact on the heat the Stirling engine receives, including the effects of convection and radiation on the environment. We find that using these new fins in the heater section of the Stirling engine significantly increases the power and efficiency of the system.

Derivation of oscillation amplitude of thermoacoustic engine based on temperature distribution in heat exchangers

Derivation of oscillation amplitude of thermoacoustic engine based on temperature distribution in heat exchangers

Study on the Compatibility between Heat Exchanger used in Automobile Exhaust Thermoelectric Generator and Engine

To enhance the compatibility between heat exchanger used in automobile exhaust thermoelectric generator (AETEG) and internal combustion engine, three different kinds of layouts among heat exchanger, muffle and catalytic converter are designed, and the effects on the temperature uniformity and temperature distribution of heat exchanger, the back pressure of engine are also analyzed respectively. The simulated results reveal that the sequential layout of three-way catalytic converter-heat exchanger-automotive exhaust muffle is the best choice, for it ensures the smallest back drops of engine, considerable temperature uniformity and relatively higher temperature distribution of heat exchanger on the same occasion, which improves the performance degradation of engine during the exhaust thermoelectric generation and provides guiding reference for the optimization of AETEG.

Prediction of temperature distribution in heat exchanger for mixed refrigerant Joule–Thomson cryocooler

The overall performance of a mixed refrigerant Joule-Thomson (MR J–T) cryocooler depends on the efficiency of the heat exchanger used to cool the refrigerant prior to J-T expansion. The multi-component refrigerant mixture gets condensed and evaporated simultaneously at different pressures in the recuperative heat exchanger which is responsible to increase its performance. However, at present, the design of such heat exchanger is difficult due to lack of experimental heat transfer data.

Finite element analysis of shell and tube heat exchanger

A finite element model to predict temperature distribution in heat exchangers is reported. The model can be effectively used to analyse and design the heat exchangers with complex flow arrangements for which no regular design procedure is available. Illustrations are provided to explain the application of the method for the analysis of shell and tube heat exchangers.