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Heat Exchangers
Design

Heat Exchangers

刘涛 2015-08-11 09:56:11 0浏览

The general function of a heat exchanger is to transfer heat from one fluid to another. The basic component of a heat exchanger can be viewed as a tube with one fluid running through it and another fluid flowing by on the outside. There are thus three heat transfer operations that need to be described:Convective heat transfer from fluid to the inner wall of the tube,Conductive heat transfer t...

Heat Exchangers
Design

Heat Exchangers

刘涛 2015-08-10 16:59:05 0浏览

The general function of a heat exchanger is to transfer heat from one fluid to another. The basic component of a heat exchanger can be viewed as a tube with one fluid running through it and another fluid flowing by on the outside. There are thus three heat transfer operations that need to be described:Convective heat transfer from fluid to the inner wall of the tube,Conductive heat transfer t...

Multiple Fans in Parallel Under Variable Speed Control
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Multiple Fans in Parallel Under Variable Speed Control

刘涛 2015-08-04 09:48:17 7浏览

Mark W. Fly,P.E.- Director of Engineering©GovernairCorporationLast RevisedJanuary 10, 2005Multiple Fan ArrangementsThere are many applications in HVAC design where it is desirable or even necessary to run fans in parallel to provide greater flow, or to pr

Multiple Fan Systems - Fans in Series and Parallel (FA/115-02)
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Multiple Fan Systems - Fans in Series and Parallel (FA/115-02)

刘涛 2015-08-04 09:46:12 3浏览

In most fan systems a single fan is selected for the required system design rating. Various methods of control are employed such as dampers, variable inlet vanes, variable pitch blades or variable speed to meet other operating points defined by the system

Important factors to consider when comparing acoustical data
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Important factors to consider when comparing acoustical data

刘涛 2015-06-16 13:42:02 29浏览

IntroductionWhen forced convection cooling is required, acoustical noise can often be a determining factor on which product or supplier is chosen. It is because of this that it is important to know that the acoustic data being compared was obtained using

Cooling Fan Noise - Sleeve Bearing vs Ball Bearing
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Cooling Fan Noise - Sleeve Bearing vs Ball Bearing

刘涛 2015-06-16 12:23:05 12浏览

IntroductionQuite often in low-flow electronic cooling fans for computers, where the aerodynamic noise is low, the predominant noise emitted by the fan is generated in the bearing system. This type of fan usually has either an oil-impregnated sleeve beari

Stall of Axial Flow Fans
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Stall of Axial Flow Fans

刘涛 2015-06-16 12:22:23 8浏览

IntroductionThe following paper describes the stall phenomena that occurs to the blades of a fan's propeller and explains its cause. To simplify the analysis, we are going to adopt certain assumptions that are described below:We assume incoming air to

Acoustic noise: causes, rating systems, and design guidelines
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Acoustic noise: causes, rating systems, and design guidelines

刘涛 2015-06-16 12:21:12 14浏览

Acoustic NoiseNoise is, to a great extent, a purely subjective personal phenomena. Perhaps the best definition of it is as an unwanted sound. Noise does, however, have two basic characteristics. The first is the physical phenomenon which can be measured a

Cooling System Design Tips
Design

Cooling System Design Tips

刘涛 2015-06-16 12:15:34 13浏览

Main ConsiderationsAir Flow, Distribution and System PressureThe greater the airflow and pressure of a given system, the greater the noise. Total airflow can often be minimized by carefully distributing flow. This is done by placing heat sources with high

Adaptive Cooling using Fan Speed Control
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Adaptive Cooling using Fan Speed Control

刘涛 2015-06-16 12:13:40 9浏览

Operating a fan or blower at full speed continuously, or cycling it on and off, is a sub optimal solution in most cooling and ventilating applications. Ideally, variable fan speed control should be used to maintain whatever speed is necessary to satisfy t

Ensuring the thermal integrity of your IC package/PC board design
Design

Ensuring the thermal integrity of your IC package/PC board design

刘涛 2015-06-09 10:26:05 14浏览

You just built a breadboard of your expert design. You did all the simulations needed before going to layout, and reviewed the manufacturer's suggested techniques for a good thermal design for the particular package chosen. You even did your due dilig