Цена 1 часа рабочей силы, как правило снижается.

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Версия 13:06, 27 октября 2012

Heat Exchanger

The actual heat exchanger is a device intended for efficient warmth transfer in one medium to a new. The actual media might be separated with a solid divider, so they in no way mix, or even they can be inside direct make contact with. These are widespread in space heating, refrigeration, air conditioner, strength plants, element indoor plants, petrochemical plant life, petroleum refineries, petroleum digesting, and sewage treatment. Just one common sort of a heat exchanger is actually the radiator in a automobile, in which the heating source, becoming a very hot engine-cooling water, drinking water, transfers heat to air sweeping through the rad.

There are two styles of heat exchangers in accordance with their flow arrangement. In parallel-flow heat exchangers, the 2 fluids the particular exchanger exact same ending, and take a trip in parallel together to the other edge. Throughout counter-flow heat exchangers the actual fluids the exchanger by opposite finishes. The table current design is rather efficient, in this it may transfer one of the most heat from temperature (transfer) medium. In the cross-flow heat exchanger, the actual fluids travel around perpendicular to one another through the exchanger.

With regard to effectiveness, heat exchanger maker are created to take full advantage of the surface section of the walls between the a couple of fluids, even though minimizing effectiveness fluid circulation throughout the exchanger. Often the exchanger's performance may also be affected by the addition of fins or corrugations in a or equally directions, which increase expanse and may channel water flow or generate turbulence. The driving temperature throughout the heat transfer surface varies using position, but an appropriate indicate temperature can be characterized. Generally in most simple programs this can be a "log indicate temperature difference" (LMTD). Oftentimes direct knowledge of the particular LMTD is not available along with the NTU method is utilized.