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Regarding the frequent occurrence of speed stalling of boiler axial flow primary fan in the operation of 600 mw unit in china,the cause of speed stalling was analyzed based on the actual measured data.the problem is mainly caused by primary air pipe resistance property variation,which caused the excessive opening of movable blades,the primary fan is working on the condition of higher wind pressure and lower flow.the approaches to reduce the speed stalling of primary fan and preventive measures are put forwa...

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After created qualified grids, discretized physical characteristic, we computed the temperature and velocity field within the standard Model by utilizing CFD techniques. The thesis focuses on the temperature design of supply air, the influence on the platform brought by stopcock wind and local exhaust and the possibility of actualizing the VAV system.

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This thesis analyzes the types and art trait of solar-assisted heat pump water heater, the development trend of direct expansion solar-assisted heat pump water heater, makes a summary of these research results from six aspects. On the basis of these works and from the point of view of receiving optimum solar radiation , the thesis develops a novel design model of direct expansion solar-assisted heat pump water heater with a truncated cone collector/evaporator, theoretically analyzes the heat that the system can absorb, compares its ability with other two types of cylinder and flat plate ones, and calculates COP and EER with computer aids. The results show that a truncated cone direct expansion solar-assisted heat pump water heater can absorb not only more solar energy but heat energy in air. It takes on favorable thermal performance. Under the average day in February which is of the worst weather throughout the year in Kunming, the COP is about 4. 2, EER is about 2.9 . The heat absorbed by the system are more than those of the other systems. The system is very great in terms of saving

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Where a lot of other machines might have ports and protrusions along their edges, the Air has none -- it swoops inward from the edge to the base with only two spots for plugs, a new, 90-degree angled MagSafe power connector on the left underside, and a clicky, extremely sturdy-feeling foldable door that is impossible to open while resting on the table, and basically requires picking the entire machine up.

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Closer to the official opening ceremony, people were starting to gather in Plaza Consistorial, where the ceremony was held, and the adjoining Plaza Castillo. Plaza Consistorial was transformed into a big, open-air party. People were chanting, tossing large balloons and splashing each other with red wine or champagne. Those on the balconies around the square also joined the folly and treated those below them with buckets of water, one after one. It all sounded fun until the crowd became too close for comfort and some people had the clever idea of pushing the others in all directions, while ground was becoming ever more slippery. The whole scene was indeed on a slippery slope itself!

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