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Air Cooling (air + cooling)

Distribution by Scientific Domains
Engineering60%

Selected Abstracts

Concurrent Use of a Handheld Forced Cold Air Device Minimizes Patient Discomfort during Fractional Photothermolysis

DERMATOLOGIC SURGERY, Issue 2005
Galen H. Fisher MD
Objective:. To assess the analgesic effect of a handheld forced cold air device during fractional photothermolysis. Methods. Twenty patients who were being treated with full-face fractional photothermolysis were asked to rate their pain level with and without the handheld air-cooling device. Pain was rated on a scale of 1 to 10, with 10 being the worst. Results. Nineteen of 20 patients noted decreased pain with the addition of handheld cooling. The mean level of pain without air-cooling was 6.95 6 2.0. The mean level of discomfort with air cooling was 4.0 6 1.8. The mean decrease in pain with the addition of air-cooling was 2.9 6 1.8. Conclusion:. The addition of a handheld forced cold air device to cool the skin before and after fractional photothermolysis treatment is an effective adjunctive analgesic modality. [source]

Comparison of evaporative inlet air cooling systems to enhance the gas turbine generated power

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, Issue 15 2007
Mohammad Ameri
Abstract The gas turbine performance is highly sensitive to the compressor inlet temperature. The output of gas turbine falls to a value that is less than the rated output under high temperature conditions. In fact increase in inlet air temperature by 1°C will decrease the output power by 0.7% approximately. The solution of this problem is very important because the peak demand season also happens in the summer. One of the convenient methods of inlet air cooling is evaporating cooling which is appropriate for warm and dry weather. As most of the gas turbines in Iran are installed in such ambient conditions regions, therefore this method can be used to enhance the performance of the gas turbines. In this paper, an overview of technical and economic comparison of media system and fog system is given. The performance test results show that the mean output power of Frame-9 gas turbines is increased by 11 MW (14.5%) by the application of media cooling system in Fars power plant and 8.1 MW (8.9%) and 9.5 MW (11%) by the application of fog cooling system in Ghom and Shahid Rajaie power plants, respectively. The total enhanced power generation in the summer of 2004 was 2970, 1701 and 1340 MWh for the Fars, Ghom and Shahid Rajaie power plants, respectively. The economical studies show that the payback periods are estimated to be around 2 and 3 years for fog and media systems, respectively. This study has shown that both methods are suitable for the dry and hot areas for gas turbine power augmentation. Copyright © 2007 John Wiley & Sons, Ltd. [source]

On the technical feasibility of gas turbine inlet air cooling utilizing thermal energy storage

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, Issue 5 2006
Y. H. Zurigat
Abstract The potential of using thermal energy storage (TES) in the form of ice or chilled water to cool gas turbine inlet air is evaluated for a remote oil field location in the Sultanate of Oman using local hourly typical meteorological year weather data. It is found that under the conditions investigated seasonal TES in chilled water storage tanks or ice bins for the location considered is prohibitively expensive and thus not recommended. Application of partial TES option shows that the cool storage does not result in any noticeable reduction in the chiller size. Hence, TES whether seasonal, partial, or full storage is not a viable option for the considered location, especially in the absence of time-of-use utility rate structure. Copyright © 2005 John Wiley & Sons, Ltd. [source]

Finite-element heat-transfer analysis of a PEEK-steel sliding pair in a pin-on-disc configuration

LUBRICATION SCIENCE, Issue 1 2001
László Kónya
Abstract Finite-element (FE) thermal models have been developed in order to study the temperature distribution in a sliding pair comprising a poly(ether ether ketone) (PEEK) pin and a steel disc in a pin-on-disc configuration. First, a moving heat source model for the disc was created. An alternative distributed heat source model was also produced in order to reduce computing time for the evaluation of the moving heat source model by some orders of magnitude. This latter model gave the same results as the moving heat source model, except for a small region just below the moving heat source. On the basis of the distributed heat source approach, a complete axisymmetric FE model for the disc side (taking the effect of thermal resistance between the assembled components into consideration) and a steady-state quarter model for the pin were developed. Water cooling and air cooling of the steel shaft were also compared. It was found that air cooling allowed a higher temperature in the contact region of the two sliding partners. The experimental results obtained with thermocouples and a thermal camera showed good agreement with the model predictions. [source]

Electromagnetic and thermal characterization of an UHF-applicator for concurrent irradiation and high resolution non-perturbing optical microscopy of cells

BIOELECTROMAGNETICS, Issue 8 2006
William F. Pickard
Abstract To permit trans-illuminated, high-resolution optical microscopy during unperturbed ultrahigh frequency (UHF) irradiation, a novel new class of applicator has been designed based upon a shielded-pair transmission line. As constructed and tested with water-immersion optics and air cooling, the applicator works most robustly over 700,1100 MHz and permits SARs at the cell layer as high as 50 W/kg before the steady state temperature rise at the cell-layer exceeds 0.5 K. Bioelectromagnetics 27:593,601, 2006. © 2006 Wiley-Liss, Inc. [source]