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Custom Engineering Essays
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Engineering Custom Essays: Heat Transfer Flow
Heat exchangers transfer heat between two or more different fluids at different temperatures. This Heat transfer between flowing fluids is one of the most important processes in engineering. Heat exchangers are found in numerous applications from power plants to automotive cooling systems. Because of the diversity of applications, heat exchangers are constructed with a wide variety of flow arrangements and physical configurations.
In heat exchanger systems, the exchange of thermal energy is achieved using various combinations of conductive, convective and radiative heat transfer. The scope of this report deals with two types of heat exchangers: parallel flow (where both fluids travel in same direction. See Fig 1) and cross flow (fluids flow perpendicular to each other. See Fig 2). Conduction and convection are assumed to be the primary modes of heat transfer for these two heat exchangers.
This experiment was conducted to evaluate the performance of two actual heat exchangers. The principle figure of merit for the parallel heat exchanger is its overall heat transfer coefficient time's surface area, UA which was determined using the air-water heat parallel flow. With regards to the performance of the cross flow the variations in air velocity and position within a staggered tube array.
Engineering Custom Essays: Steam Reforming Gas
This process involves the catalytic reforming of natural gas (or light hydrocarbons) in the presence of steam to produce synthesis gas which is primarily a mixture of carbon monoxide and hydrogen. The synthesis gas is a major intermediary for the production of hydrogen which can be used as a fuel in itself or various other chemicals and is a major ingredient in the Fischer Tropsch synthesis which is the heart of the GTL (gas to liquid) technology which aims at converting gaseous hydrocarbons to liquid fuels.
The steam reforming generally consists of the following two steps: Reforming of natural gas: In this process steam reacts with natural at 800 C in the presence of Nickel, Cobalt or Copper as the catalyst to produce synthesis gas which is primarily CO and H2. The reaction (considering a natural gas stream predominantly methane with other lighter hydrocarbons) is shown below:
The above reaction is endothermic reaction and the heat associated with it is 206kJ/mol. Water Gas Shit Reaction: This CO produced in the above reaction, reacts with the steam in the reactor to produce CO2 and H2 and in the forward direction it is exothermic reaction releasing 41kJ/mol. This process generally gives a H2 to CO ratio equal to 3.
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