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Heat exchangers with very high effectiveness, typically greater than 95%, are required in all cryocoolers. Conventional experimental methods cannot be used for the determination of the effectiveness of cryogenic heat exchangers since the uncertainty in temperature measurement typically 0.1 K at room temperature to 0.3 K at cryogenic temperatures can result in an uncertainty of 1 to 2% in effectiveness...
Rapid heat removal from heated surfaces and reducing material weight and cost become a major task for design of heat exchanger equipments like Cooling of I C engines. Development of super heat exchangers requires fabrication of efficient techniques to exchange great amount of heat between surface such as extended surface and ambient fluid. The present paper reports, an experimental study to investigate...
This paper investigates a two-phase non-boiling slug flow regime for the purposes of enhancing heat transfer in microchannel heat sinks or compact heat exchangers. The primary focus is upon understanding the mechanisms leading to enhanced heat transfer and also the effect of utilizing different Prandtl number fluids. Experiments were conducted using Infrared thermography and results presented in terms...
The effect of intermittent operation on the heat transfer performance of vertical U buried pipe heat exchangers is studied by method of numerical simulation and analytical solution. The calculation area is divided into two parts by the boundary of the borehole wall. For the area in the borehole, the calculation method is steady analytical solution, and for the soil area, the method is finite volume...
Enhanced heat transfer in a high aspect ratio channel that models a segment of a novel, high-performance air-cooled heat-exchanger system for high-power electronics is characterized. Two innovative features that enable this system are integration of a centrifugal blower-diffuser with a high-density finned heat-sink, and microfabricated active reed elements that provide small-scale heat transfer enhancement...
The aim of present study is to investigate and analyzed the thermal properties of TiO2 composite material, by using the comparison method of pin fin heat exchanger. The thermal properties of TiO2 composite material can easily been find out by pin fin heat exchanger. Here it is used the plane copper material to coat the TiO2 composite material because of the good thermal conductivity of the copper...
This paper deals with the state variables (temperatures) estimation for a counter-flow double-pipe heat exchanger using multi-linear models using a Kalman filter (FK) for the state variables approaching and using Bayes probability for the change of the model. The reliability of the proposed method was demonstrated via numerical simulation and laboratory experiments with a bench-scale pilot plant.
The enhancement of condensation heat transfer is of practical importance in many industries such as heating, ventilating and air conditioning, power, and aerospace. The present work is concerned with the electrohydrodynamic enhancement of external condensation on single commercial enhanced tubes. Future phases of this work will include applying the technique to practical heat exchangers and developing...
In order to develop a compact intermediate heat exchanger which is applicable for high temperatures above 900degC, assuming HTGR (high temperature gas cooled reactor), a heat exchanger module made of SiCf/SiC composite has been designed, fabricated and tested with LiPb-He double loop. The heat transfer from liquid metal to gas has been measured, and heat transfer of >1.3 kW and reasonable heat...
The convective heat transfer and pressure drop characteristics in corrugated channels were experimentally investigated. Experiments were performed on channels of uniform wall temperature and of fixed corrugation ratio, gamma (2A/L=0.2) over a range of Reynolds number, 3220 lesReles9420. Corrugated channels of 0deg, 90deg and 180deg phase shift and with different spacing are considered. The effects...
ldquoDevelopment for advanced thermoelectric conversion systemsrdquo supported by the new energy and industrial technology development organization (NEDO) has been successfully completed as one of the Japanese national energy conservation projects. Three types of the cascaded thermoelectric modules operating up to 850 K in high electrode temperature and two types of Bi-Te thermoelectric modules operating...
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