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How to do when cooler heat transfer effect is poor |
| Author : Zhang Date : 2014/8/5 23:32:48 |
How to do when cooler heat transfer effect is poor
In heating system, hot water cooler is important function for the user to preparation, so probably would choose the network to meet the heat source of the economic room, but a heat medium temperature at 130-80 ℃ or 110-80 ℃, the secondary heat medium temperature is 95-70 ℃, and the mostly used secondary heat medium temperature, so there is a difference in temperature, cold and hot sides in the cooler medium disposal quantity difference, the difference in temperature big on one side of the small amount of disposal of medium and small temperature difference between one side of the media will be the disposal of large amount, which will cause between cold and hot medium in the cooler board on one side of the high side and low flow velocity, and high flow velocity on only one side of the convection heat transfer coefficient alpha is big, medium and low velocity of flow on one side of the convection heat transfer coefficient is small.When the convective heat transfer coefficient of cold and hot medium alpha 1 with alpha 2 large difference, can affect set decoration equipment transfer coefficient K value, thus affecting the results of heat transfer in the cooler.
Reasonable process planning of the cooler can be indirectly affect the thermal performance of the cooler, so as to solve the problems, the beginning of the cooler to justice process plan, so much under the same heat load, can lose less heat transfer area, frugal investment can also.If process plan, differences about decoration application of multiple process plans not only increase of set equipment operation, cold and hot medium in between all reflux, which affect heat transfer as a result, and also very easily render channel infarction sign, unlucky in parts.
Second can range application of cold and hot fluid section, the current many heating conditions are hot and cold sides disposal amount is differ, so if using this method, can through mediation cooler cold and hot fluid on both sides of the cross-sectional area to mediation on both sides of the plate between the flow velocity, medium disposal to progress a little on one side of the convective heat transfer coefficient, which in turn can reach the target progress parts heat transfer results, this method used in ordinary plate cooler, combined with the ordinary plate cooler in the resistance is very low, when resistance growth will not beyond the system allow resistance value, so it is the current progress in heat transfer result one of the most ambitious treatment method.
In addition to the above measures, can also add a side between the cooler revenues and expenditures in the mouth way of tube after temperance regulating valve opening and resistance of cooler water into the heat exchanger to satiety system's request, and through the by-pass pipe water confused with water cooler export water temperature reaches the system request.This way is just in the temperature difference between heat transfer conditions, is applied to the large amount of disposal of the lateral resistance is too large and had to increase the heat transfer area is one of the cooler ease pace, and the application range section plate cooler, the logarithmic are eliminated half, temperature difference and the area is doubled, capital growth, and only have a kind of ease the influence, can not practice process, thus this method can only be as cold and hot medium disposal quantity is large for general plate cooler used in the system in a ease the pace, and therefore take the external heat exchanger driving force for the price.And this kind of way to follow the cooler from time to time increases, the working condition of compliance, strengthen the influence gradually get it.
Follow the progress of science and technology, the research and development, planning, and produce plate cooler, should just even make its structure comply with the request for the working conditions of the system, so as to eliminate about all about working condition of bridge system influence on its heat transfer function, the ultimate finished the best heat transfer results, and energy saving, low capital, the ultimate progressive enterprise economic benefits.
The above: Fouling ,plugging and leakage is the failure reasons of the column tube cooler
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