A European manufacturer built lamps intended for retirement and nursing homes that used light emitting diodes (LEDs) to cut energy consumption by more than 90%. Unfortunately, the first prototype overheated and using fans to cool the lamps wasn't an option because they would be too noisy. So , a Belgium-based engineering consulting firm, did a thermal simulation with FloEFD.Pro, CFD software that works inside Pro/Engineer and comes from Mentor Graphics Mechanical Analysis Div . (formerly Flomerics) in Marlborough, Mass. Mentor Graphics Mechanical Analysis Div. Each lamp contains six LEDs mounted on a 6-cmdiameter PCB cylinder. Each LED dissipates 2 W, and their maximum operating temperature is 105°C. A power supply in the enclosure has a maximum operating temperature of 70°C. The relatively small size of the housing (11 × 8 × 8 cm) and its close proximity to the ceiling complicated the thermal-management problem. Voxdale President Ken Beyers modeled the light in Pro/Engineer. Program inputs for CFD included materials for the housing, heat sink, and PCB. The CFD analysis also included values for properties of the material connecting the LEDs to their aluminum heat sink, as well as the direction of gravity, important because the lamp is cooled by natural convection. Other parameters entered included the heat generated by the LED and power supply. Defining all the information needed to convert CAD geometry to a CFD model took about 30 min. The next step was getting the CFD software to mesh the fluid path around and through the housing. First came generating a coarse mesh to perform a fast simulation for a quick check. Results appeared realistic, so a finer mesh was generated for more accurate results. With the finer mesh, results took about an hour. They highlighted the basic design flaw: The housing needed more outlets to get air flowing
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Computational Fluid Dynamics Software (CFD)
Computational fluid dynamics software (CFD) is used for the calculation of flow parameters in fluids, and for the design and simulation of the behavior of fluidic systems. CFD is also used to simulate fluid mechanics.
Lamps are light sources that emit incoherent light for illumination. There are many different types of products. Examples include fluorescent lamps, halogen lamps, heat lamps, incandescent lamps, LED lamps, projection lamps, spectral lamps, and stage lamps. Specialized and proprietary lamps are also available.
LED lamps are light emitting diode arrays with traditional lamp ballasts.
Light Emitting Diodes (LED)
Light-emitting diodes (LED) are PN junction devices that give off light radiation when biased in the forward direction. LEDs are used in a wide variety of indication applications.
Heat lamps are also known as infrared emitters, infrared bulbs, infrared tubes, or infrared lamps. Heat lamps differ from illuminating lamps in their low filament temperature, resulting in much less light and more infrared radiation.
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