scholarly journals Thermal performance enhancement of a cooling tower heat sink radiator

2021 ◽  
pp. 101477
Author(s):  
Hazim Alwan Mejbil ◽  
Hayder Mohammad Jaffal
Keyword(s):  
Thermal Performance ◽  
Heat Sink ◽  
Cooling Tower ◽  
Performance Enhancement

Performance Enhancement of Air Cooled Heat Sink Used in Inverter Drives of Residential Air Conditioners

2020 ◽  
Vol 28 (01) ◽  
pp. 2050008
Author(s):  
Vignesh Lakshmanan ◽  
Pushpak Doiphode ◽  
Indraneel Samanta
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Heat Sink ◽  
Performance Enhancement ◽  
Air Conditioner ◽  
Electronic Components ◽  
Variable Frequency Drive ◽  
Air Conditioners ◽  
Baseline Case ◽  
Heating Load

Inverter air conditioners are being widely used in the air conditioning sector for energy saving purposes. These air conditioners use an inverter or a variable frequency drive (VFD) to control the compressor operating speed based on cooling or heating load fluctuations. If the heat generated by the electronic components of the VFD is not dissipated properly, it can lead to failure of the VFD. In general, a heat sink is used for dissipating the heat generated by the electronic components of the VFD. The heat sink can be either air cooled or liquid cooled. Using computational fluid dynamics (CFD), this paper deals with optimization of the thermal performance of an air cooled plate-fin heat sink with rectangular fins used in a residential split inverter air conditioner. Commercially available CFD tool has been used for simulations. It has been observed that enhancing fluid flow around the heat sink and improving heat transfer area of the fins significantly improve the thermal performance of the heat sink. By using heat sink with rectangular fins having a stepped profile, it has been possible to improve the heat transfer from the baseline case by 27%. Whereas, by using hollow fins, heat transfer improvement of 20% has been achieved.

Small-Scale Vorticity Induced by a Self-Oscillating Fluttering Reed for Heat Transfer Augmentation in Air Cooled Heat Sinks

2015 ◽  
Author(s):  
Pablo Hidalgo ◽  
Ari Glezer
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Thermal Performance ◽  
Heat Sink ◽  
Performance Enhancement ◽  
Single Channel ◽  
Base Flow ◽  
Fluid Power ◽  
Small Scale

Heat transfer in a high aspect ratio, rectangular mm-scale channel that models a segment of a high-performance, air-cooled heat-sink is enhanced by deliberate formation of unsteady small-scale vortical motions. These small-scale motions are induced by self-fluttering, cantilevered planar thin-film reeds that are placed along the channel’s centerline. Heat transfer is enhanced by significant increases in both the local heat transfer coefficient at the fins surfaces, and in the mixing between the thermal boundary layers and the cooler core flow. The present investigation characterizes the thermal performance enhancement by reed actuation compared to the base flow (in the absence of the reeds) in terms of increased power dissipation over a range of flow rates, along with the associated fluid power. It is shown that because the cooling flow rate that is needed to sustain a given heat flux at a given surface temperature is almost two times higher than in the presence of the reeds, the reeds lead to a four-fold increase in thermal performance (as measured by the ratio of power dissipated to fluid power). The thermal effectiveness of the reeds is tested in a multi-channel heat sink, and it is shown that the improvement in heat transfer coefficient of the base flow is similar to that of the single channel.

Dry and Wet-Peaking Tower Cooling Systems For Power Plant Application

1976 ◽  
Vol 98 (3) ◽  
pp. 335-346
Author(s):  
M. W. Larinoff ◽  
L. L. Forster
Keyword(s):  
Power Plant ◽  
Performance Analysis ◽  
Thermal Performance ◽  
Heat Sink ◽  
Cooling Tower ◽  
Cooling System ◽  
Water Requirements ◽  
Surface Type ◽  
Makeup Water ◽  
Cooling Systems

A new concept of power plant heat-sink system is presented which employs the combination of a conventional wet-tower and a conventional dry-tower. The purpose of this cooling system is to reduce wet cooling-tower makeup-water requirements in water-short areas. The dry tower operates all year around while the wet-peaking tower is used only above certain ambient dry-bulb temperatures. The two cooling circuits serve separate sections of a conventional, surface-type, steam condenser. Thermal performance analysis is presented for various combinations of cooling systems ranging from 100 percent wet to 100 percent dry. Annual makeup-water requirements are calculated for various sizes of towers located in 18 selected cities of the U.S.A. ranging from north to south and east to west.

NUMERICAL ANALYSIS OF THE THERMAL PERFORMANCE OF A NOVEL DOUBLE-LAYERED HEAT SINK WITH STAGGERED PIN FINS

2019 ◽  
Vol 50 (8) ◽  
pp. 757-772 ◽  
Author(s):  
Yicang Huang ◽  
Hui Li ◽  
Shengnan Shen ◽  
Yongbo Xue ◽  
Mingliang Xu ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Thermal Performance ◽  
Heat Sink ◽  
Pin Fins

An Investigation of the Effect of interrupted fin arrangements on the Thermal Performance of a Heat Sink under a Free Convection Condition

2019 ◽  
Vol 7 (1) ◽  
pp. 43-53
Author(s):  
Abbas Jassem Jubear ◽  
Ali Hameed Abd
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Natural Convection ◽  
Thermal Performance ◽  
Heat Sink ◽  
Numerical Study ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Steady State Heat ◽  
Steady State Heat Transfer

The heat sink with vertically rectangular interrupted fins was investigated numerically in a natural convection field, with steady-state heat transfer. A numerical study has been conducted using ANSYS Fluent software (R16.1) in order to develop a 3-D numerical model.  The dimensions of the fins are (305 mm length, 100 mm width, 17 mm height, and 9.5 mm space between fins. The number of fins used on the surface is eight. In this study, the heat input was used as follows: 20, 40, 60, 80, 100, and 120 watts. This study focused on interrupted rectangular fins with a different arrangement and angle of the fins. Results show that the addition of interruption in fins in various arrangements will improve the thermal performance of the heat sink, and through the results, a better interruption rate as an equation can be obtained.

Thermal Performance Enhancement of a Shallow Solar Pond Based on Nanofluids

2020 ◽  
Vol 12 (1) ◽  
pp. 01016-1-01016-5
Author(s):  
A. Terfai ◽  
◽  
Y. Chiba ◽  
M. N. Bouaziz ◽  
◽  
...  
Keyword(s):  
Thermal Performance ◽  
Performance Enhancement ◽  
Solar Pond
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