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Additive manufacturing is a fast-growing technique due to its ability to fabricate complex objects layer by layer from a preprogrammed digital model. Additive manufacturing can greatly enhance the heat exchanger manufacturing field, as it makes possible the fabrication of complex heat exchanger designs that are challenging to fabricate using conventional methods. In the present work, an air-to-water...
Performance tracking, consisting of system state identification, fault detection, and propagation prediction, is critical to system operation optimization and maintenance scheduling. It is typical that dynamic systems degrade in a nonlinear manner, often times accompanied by abrupt fault occurrences, before and after which the degradation rate varies. Commonly used state estimation techniques for...
An attractive option for constructing Thermoelectric Generators (TEGs) is to incorporate a water-fed heat exchanger with commercially available thermoelectric modules. A major design concern to such an implementation is the heat exchanger geometry. In this study, a thorough performance evaluation of TEGs embedded in 30 configurations is conducted through simulations to optimize thermoelectric systems...
Heat exchanger is the almost common equipment for the industrial process heating. Heat is transferred from one fluid to other fluids by convection and conduction through the wall of the heat exchanger. Effectiveness of heat exchanger depends on the convection heat transfer coefficient of the fluid. Convective heat transfer coefficient of water, Cu-water, Al-water, Al2O3-water and TiO2-water of 2%...
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...
According to the basic formula of central heating system, the running adjustment formular is derived concerning it. On the basis of the formula, the running adjustment curve is obtained by using origin when adopting the different ways of regulation on both sides of heat exchanger. Finally with the outdoor temperature, it is concluded that the adjusting method of the variable flow and temperature of...
Aiming at the process characteristic about heat and moisture exchanger process during air flowing on water-film channel of cooling pad, we gave a proposal that the process was regarded as enthalpy transfer process, and then, the concept of enthalpy degree of moisture air and water-film was defined basing on the idea of potential different action. By analogy of heat transfer, enthalpy transfer was...
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...
To develop a high effectiveness, reliable, cost-effective compact heat exchanger is one of the key issues for effective use of thermal energy. By stacking multilayered flat thin rectangular plates with a number of regular honeycomb cells etched inside, the well designed staggered fluid flow channels are formed to enhance heat transfer. For the cooling system with the new type design heat sink, experimental...
An computational study of heat transfer in a compact heat exchanger is reported, performed with regard for the heat and mass transfer of the humid-air flow in the cold and hot circulation circuits of the heat exchanger. The computational study was performed using a homogeneous, two-dimensional theoretical model of heat transfer in a cross-flow compact heat exchanger with plate ribbing. In the model,...
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