• Title, Summary, Keyword: Cooling fan

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Experimental Study on Performance Characteristics with Various Spacings between Automobile Cooling Fan and Engine Block (차량용 냉각 팬과 엔진 블럭의 간격 변화에 따른 성능 특성 연구)

  • Yu, Byoung-Min;Ryu, Ki-Wahn;Jang, Jea-Kyung;Ih, Kang-Duck;Hong, Sung-Kyu
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.143-149
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    • 2009
  • Recently, according to the tendency to the more comfortable automobile, the improvement of performance of the cooling fan is required. The performance of cooling fan is affected by many peripheral parts, such as radiator, condenser, engine block and etc. Therefore, it is important to consider the effect of peripheral components on the fan performance in design and analysis stages. In this paper, the performance of automobile cooling fan is investigated experimentally by using the large capacity fan tester based on the ASHRAE and the AMCA standards. In particular, the various spacing between cooling fan and engine block are considered to obtain the effect of engine block. An empirical relation between the fan flow rate and the spacing was proposed.

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Prediction of the Effect of Cooling Fan Electrification on City Bus (냉각팬 전동화에 따른 시내버스 연비효과 예측)

  • Lee, Yongkyu;Park, Jinil;Lee, Jonghwa
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.22 no.6
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    • pp.908-912
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    • 2013
  • Because of their longer operating times and larger size relative to conventional fans, the cooling fans mounted in buses consume larger amounts of energy. Most of the cooling fans mounted in a bus are connected to the engine by a viscous clutch. A viscous cooling fan's speed is determined by its fluid temperature, which is affected by the air flow through the radiator. The fan does not react immediately to the coolant temperature and in doing so causes unnecessary energy consumption. Therefore, the fuel economy of buses using viscous fans can be improved by changing to an electric cooling fan design, which can be actively controlled. In addition, electric power consumption is increased by using electric cooling fans. Thus, when electric fans are applied in conjunction with the alternator management system (AMS), the fuel economy is further enhanced. In this study, simulations were performed to predict coolant temperature and cooling fan speeds. Simulations were performed for both viscous and electric cooling fans, and power consumption was calculated. Additionally, fuel economy was calculated applying both the alternator management system and the electric cooling fan.

Study on the Design Concept of Impinging Jet Electronics Cooling by Using Axial Fan (축류 팬을 이용한 충돌제트 전자냉각 설계개념에 대한 연구)

  • Lee, Chan;Kil, Hyun-Gwon
    • The KSFM Journal of Fluid Machinery
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    • v.12 no.2
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    • pp.24-30
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    • 2009
  • Flow and noise analyses are conducted for examining a new design concept of impinging jet electronics cooling, and the analysis results are compared with conventional electronics cooling techniques. For the application of impinging jet electronics cooling method, the present study considers the air duct where air is supplied by axial fan and air flow from the duct is impinged vertically onto the electronic component heat source. Applying CFD simulation technique and fan noise model to the present cooling scheme, the cooling performance of the impinging jet as well as the operation condition and the noise characteristics of fan are investigated for various impinging jet nozzle conditions and fan models. Furthermore, the impinging jet electronics cooling analysis results are compared with the conventional parallel-flow cooling scheme to give the design concept and criteria of impinging jet cooling method.

The Effects of Operational Conditions of Cooling Water System on Energy Consumption for Central Cooling System (냉각수 계통의 운전변수가 중앙냉방시스템의 에너지소비량에 미치는 영향)

  • Ahn, Byung-Cheon
    • Transactions of the Korea Society of Geothermal Energy Engineers
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    • v.13 no.4
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    • pp.8-13
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    • 2017
  • The effects of operational conditions of cooling water system on energy consumption for central cooling system are researched by using TRNSYS program. Cooling tower water pump flow rate, cooling tower fan flow rate, and condenser water temperature with various dry-bulb and wet-bulb temperatures are varied and their effects on total and component power consumption are studied. If the fan maximum flow rates of cooling tower is decreased, cooling tower fan and total power consumptions are increased. If the cooling tower water pump maximum flow rates is decreased, chiller and total power consumptions are increased. If condenser water set-point temperature is increased, chiller power consumption is increased and cooling tower fan power consumption is decreased, respectively.

Experimental Facility for Measuring the Cooling Performance of a Piezoelectric Fan (피에조 팬 냉각 성능 측정을 위한 실험장치 구축)

  • Oh, Myong Hun;Park, Soo Hyun;Ko, Jae Ik;Choi, Minsuk
    • Journal of the Korean Society of Visualization
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    • v.16 no.3
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    • pp.52-58
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    • 2018
  • In this study, an experimental facility has been built to measure the cooling performance of a piezoelectric fan. The facility is composed of a heat source made of $50{\mu}m$ Ni-Cr foil, a piezoelectric fan and a rotary fan for cooling the heat source. For two cases where the foil is vertical or horizontal, the surface temperature on the foil has been measured by an IR camera with and without cooling and the cooling performance of both fans has been analyzed. With cooling by both fans, the rotary fan lowers the surface temperature of the foil as a whole, while the piezoelectric fan lowers the surface temperature at the center of the foil locally. It is also found that the cooling effectiveness of the piezoelectric fan is higher on the horizontal foil than on the vertical foil because the natural convection interferes with the jet from the piezoelectric fan.

Experimental Study of Cooling Fan Performance Analysis and Shroud Characteristics for an Excavator (굴삭기 냉각팬 성능해석 및 슈라우드 특성에 대한 실험적 연구)

  • Lee, Jae-Seok;Chung, Kyung-Nam;Kim, Jin-Young;Lee, Tae-Kyung;Kang, Jeong-Won;Shim, Jae-Koo;Son, Deuk-Kyun
    • Proceedings of the KSME Conference
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    • pp.2597-2602
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    • 2007
  • In this paper, the performance analysis is experimentally carried out in order to select the best cooling fan and shroud considering both cooling performance and noise reduction. 4 cooling fans have been tested in the fan tester and the real excavator. In order to obtain the performance of the cooling fans, flow capacity has been estimated by measuring flow velocity using a hot wire anemometer, and noise radiation has been also measured to estimate the fan noise. Characteristics of a box-type and a streamlined shroud have been examined by changing the immersion depth of cooling fans. Based upon the results, the best cooling fan is selected. Finally, the criterion to select the best cooling fan has been set up.

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Development of Fan Balancer System for Detecting Unbalance of Automobile Cooling Fan (자동차용 냉각팬의 불량검출을 위한 팬 밸런서 시스템 개발)

  • Kim, Sung-Ho;Youk, Yui-Su
    • Journal of Korean Institute of Intelligent Systems
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    • v.19 no.1
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    • pp.83-89
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    • 2009
  • Generally, automobile cooling fan is used to lower the temperature of radiator. The cooling fans are manufactured by plastic injection molding process. The center of gravity of cooling fan is often deviated from the center due to the use of deteriorated materials. As the unbalanced of the cooing fan can generate noise, it is required to measure the degree of deviation of center of gravity in the cooling fan. In this work, automatic fan balancer which can effectively detect the magnitude and position of the unbalanced cooling fan is proposed and several experiments are carried out to verify the feasibility of the proposed algorithm.

Performance Characteristics of Automobile Cooling Fan according to Gap between Engine Block and Cooling Fan (엔진 블록과 냉각 팬의 간극에 따른 자동차 냉각 팬의 성능 특성 연구)

  • Yu, Byoung-Min;Ryu, Ki-Wahn;Ih, Kang-Duck;Lee, Myung-Han;Hong, Sung-Kyu
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.92-97
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    • 2009
  • The performance of cooling fan is affected by many peripheral parts, such as radiator, condenser, engine block and etc. Higher power has been requested in more confined automobile engine room. Thus, cooling performance becomes very important to remove the heat generated from the automobile engine more efficiently. In this paper, the performance of cooling fan including effects of engine block is investigated by using a fan tester based on the ASHRAE and the AMCA standards. A flow rate - gap distance curves and a flow rate - engine block constant curves are obtained from this study.

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Internal Flow Condition of High Power Contra-Rotating Small-Sized Axial Fan

  • Shigemitsu, Toru;Fukutomi, Junichiro;Agawa, Takuya
    • International Journal of Fluid Machinery and Systems
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    • v.6 no.1
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    • pp.25-32
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    • 2013
  • Data centers have been built with spread of cloud computing. Further, electric power consumption of it is growing rapidly. High power cooling small-sized fans; high pressure and large flow rate small-sized fan, are used for servers in the data centers and there is a strong demand to increase power of it because of increase of quantity of heat from the servers. Contra-rotating rotors have been adopted for some of high power cooling fans to meet the demand for high power. There is a limitation of space for servers and geometrical restriction for cooling fans because spokes to support fan motors, electrical power cables and so on should be installed in the cooling fans. It is important to clarify complicated internal flow condition and influence of a geometric shape of the cooling fans on performance to achieve high performance of the cooling fans. In the present paper, the performance and the flow condition of the high power contra-rotating small-sized axial fan with a 40mm square casing are shown by experimental and numerical results. Furthermore, influence of the geometrical shape of the small-sized cooling fan on the internal flow condition is clarified and design guideline to improve the performance is discussed.

Design of Low Noise Engine Cooling Fan for Automobile using DACE Model (전산실험모형을 이용한 자동차 엔진 냉각홴의 저소음 설계)

  • Sim, Hyoun-Jin;Park, Sang-Gul;Joe, Yong-Goo;Oh, Jae-Eung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.5
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    • pp.509-515
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    • 2009
  • This paper proposes an optimal design scheme to reduce the noise of the engine cooling fan by adapting Kriging with two meta-heuristic techniques. An engineering model has been developed for the prediction of the noise spectrum of the engine cooling fan. The noise of the fan is expressed as the discrete frequency noise peaks at the BPF and its harmonics and line spectrum at the broad band by noise generation mechanisms. The object of this paper is to find the optimal design for noise reduction of the engine cooling fan. We firstly show a comparison of the measured and calculated noise spectra of the fan for the validation of the noise prediction program. Orthogonal array is applied as design of experiments because it is suitable for Kriging. With these simulated data, we can estimate a correlation parameter of Kriging by solving the nonlinear problem with genetic algorithm and find an optimal level for the noise reduction of the cooling fan by optimizing Kriging estimates with simulated annealing. We notice that this optimal design scheme gives noticeable results. Therefore, an optimal design for the cooling fan is proposed by reducing the noise of its system.