... computational fluid dynamics/heat transfer and refrigeration and air-conditioning for over 25 years. However starting from his Ph.D. ‘A numerical study of the effects of fluid properties on natural convection’ awarded in 1984, one of his main passions has been natural convection and therefore the focus...

...) and high Pr (80–140) numbers that are typically found in secondary refrigeration loop conditions. The effect of horizontal U-bend is also presented. It is shown that the positive effect of thermal development (high Nu number) lasts long because of the technically significant length of the thermally...

...C Herman; M Pirtini Çetingül 28 05 2009 heat exchangers heat pumps heat transfer holographic interferometry loudspeakers plates (structures) refrigeration temperature distribution thermoacoustics 2009 American Society of Mechanical Engineers ...

... in refrigeration system and air-conditioning systems. 13 08 2007 06 05 2008 03 09 2008 air conditioning microchannel flow pipe flow refrigeration two-phase flow carbon dioxide microfin tube pressure drop low temperature two-phase One of the most common techniques...

... for a direct coupling of the rotating condenser section to an on-axis stationary refrigeration system, while allowing the revolving evaporator section to intercept off-axis heat sources in the rotating machine. An experimental rotating heat pipe test apparatus was built and operated. The test data indicate...

...N. Ablanque; J. Rigola; C. Oliet; J. Castro The aim of this work is to present a critical examination of both the available experimental data and the performance of the available heat transfer correlations for oil-free ammonia horizontal in-tube boiling at fin-and-tube-type air-to-refrigerant...

... refrigeration Peltier effect microelectronic cooling nanostructures thin films nanowires nanomaterials The thermoelectric effect has been applied to provide useful cooling, generate electrical power, and provide measurement of temperature for many decades. Thermoelectric phenomenon was discovered...

... in High-Performance Absorber and Absorption Enhancement ,” Refrigeration 0034-3714 , 60 , pp. 72 – 79 . Hozawa , M. , Inoue , M. , Sato , J. , and Tsukada , T. , 1991 , “ Marangoni Convection During Steam Absorption into Aqueous LiBr Solution With Surfactant ,” J. Chem. Eng...

...J. Iragorry; Y.-X. Tao To develop a better defrosting control system on finned evaporators of a refrigeration system, a study is conducted to better quantify the frosting and defrosting processes by using an infrared thermometer to determine the frost surface temperature. For gradual frost...

... chassis is mounted in the forward bay, and the ECS is mounted in the rear bay of the electronics pod. The ECS is an air-cycle refrigeration system, which operates on captured ram air directed by an inlet/diffuser to an expansion turbine. This turbine produces low-pressure, chilled air, which...

... temperature, depending on the doping characteristics of the chip. The current research focuses on IBM’s mainframe, which uses a conventional refrigeration system to maintain chip temperatures below that of comparable air-cooled systems, but well above cryogenic temperatures. Although performance has been...

..., performance improvement ranges from 1% to 3% for every 10°C lower transistor temperature can be realized. The IBM S/390 high-end server system is the first IBM design which uses a conventional refrigeration system to maintain the chip temperatures below that of comparable air-cooled systems, but well above...

... only half the Carnot value. The power dissipated in the regenerator is removed as part of the heat withdrawn at the regenerator’s cold side. Analogous results are presented for the Stirling refrigerator. At optimized nondimensional rate of refrigeration, its coefficient of performance is less than half...

...H. Honda; N. Takata; H. Takamatsu; J. S. Kim; K. Usami Experimental results are presented that show the effect of fin geometry on condensation of downward flowing zeotropic refrigerant mixture R407C in a staggered bundle of horizontal finned tubes. Two types of conventional low-fin tubes and three...

... Heat Transfer Mass Transfer Melting Phase Change Refrigeration Frost formation on a cold plate has considerable practical relevance; however, the formation of frost could be desirable or undesirable depending on individual cases. For example, it is in general undesirable to have frost layer...

...F. J. Smit, Ph.D. student; J. R. Thome, Mem. ASME, Professor; J. P. Meyer, Mem. ASME, Professor Heat transfer coefficients during condensation of zeotropic refrigerant mixtures were obtained at mass fractions of 90 percent/10 percent, 80 percent/20 percent, 70 percent/30 percent, 60 percent/40...

... to freezer operation has to do with the proper choice of the so-called coil “TD.” The coil “TD” is a term used in the industrial refrigeration community to designate the difference between the coil entering air temperature and the coil refrigerant temperature. Prolonged freezer operation under less-than...

...F. J. Smit, Ph.D. student; J. P. Meyer, Mem. ASME, Professor Using mixtures of the zeotropic refrigerant mixture R-22/R-142b, a series of experiments was performed to determine the sectional and average heat transfer coefficients. Experiments were also conducted to compare three different heat...

... coefficients at several cross-sections of the test tube with inner diameter of 11.3 mm for several vapor qualities of refrigerant. The inner wall temperatures were calculated by one dimensional heat conduction equation from the measured outer wall temperatures, which were obtained using an image processing...

... Refrigeration It is known that nucleate boiling is characterized by the formation of vapor bubbles from fixed sites randomly distributed on a heating surface. Moreover, enhanced boiling surfaces would generally create more bubbles and, consequently, result in a higher heat transfer performance. Although...