Solar LED road lamp heat dissipation problem in parsing

At present, many people put main eyes are on the LED on the number of lumens, with less attention to LED lamps and lanterns, heat dissipation. In fact, the LED on the number of lumens are rapidly increasing. In 2006, production of LED on the number of single tile lumens has reached 50 lumen, and that figure is growing rapidly. And its corresponding system of heat transfer theory is mature, we can use the means of heat transfer is clear: basic and phase change heat transfer (conduction, convection and radiation Such as heat pipe) 。 On the heat transfer or thermal problems, therefore, we can take measures are visible, limited.
according to the luminous flux ( Lumens) And radiation flux ( Watts) Operation: among them, the Km = 683 lm/w, is the scale of luminous flux, is the scale of the radial flux. That is, the radial flux 1 w in the ideal case, Blackbody radiation) May produce 683 lm luminous flux. So, even if the LED lights to reach 200 lm/w, nor will all energy into light energy output, and the rest is converted into heat energy. In the long run LED lamps and lanterns, heat dissipation problems will be a long-standing problem.
the LED street lamp cooling ways mainly include: natural convection, adding fans forced cooling, heat pipe, and the loop heat pipe cooling, etc. Equipped with fans forced cooling way system complexity, low reliability, high heat pipe and the way of the loop heat pipe cooling costs. And street lamp which has outdoor use at night, the radiating surface is located in the lateral and smaller size restriction is beneficial to the advantages of the air natural convection, so the LED street lamp suggested that as far as possible choose natural convection cooling way.
thermal design of the problem are as follows:
1, the heat dissipation fin area is set at random.
2, unreasonable cooling fin arrangement, lamps and lanterns of the heat dissipation fin failed to consider the use of lamps and lanterns decorate way, affect the effect of fin.
3, emphasis on heat conduction link, and ignore the convection part, although many manufacturers to consider a variety of measures: loop heat pipe and heat pipe, plus the heat-conducting silicon grease, etc. , but don't realize ultimately depends on the surface area of lamps and lanterns, heat dispersion.
4, ignore the balance of heat transfer, if the temperature of the fin uneven distribution is serious, will cause part of fin ( Low temperature part) No role or function is limited.
now LED street lamp cooling technology, the use of thermal conductive plate, general is a 5 mm thick copper plate, is actually mean temperature plate, the heat source temperature drop; Also with a heat sink for cooling, but too much weight. Weight on the street lamp system is very important, because of the high street light is 9 meters, if too much risk increases, especially in typhoon, earthquake can cause accidents. May, after the future field of LED into the street lights, may form modularization heat dissipation can better resolve the LED street lamp cooling difficult condition.