Material circulation

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  • Through the efforts of a wide array of public and private organizations around the globe, a strong and growing movement is beginning the process of transforming the systems that create the built environment from ones that pay no attention to resources and the environment to a new variety in which these considerations are the pre-eminent criteria for “good” construction. Although dating back only to the early 1990s, there is already ample evidence that the “green building” movement is affecting the design, construction, operation, and disposal of the built environment....

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  • The spleen is situated in the Middle Energizer. Its main physiological functions of spleen involves: the transportation and transformation of water and food on one hand, and of dampness on the other, controlling all the blood of the body and keeping it circulating normally within the vessels, transports and transforms the essence of food and drink to nourish the muscles and the four limbs. The mouth is the aperture of the spleen, for this reason, the lips reflect the condition of the spleen's function of transporting and transforming water and food.

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  • Our precious planet is in peril. The economic overshoot of ecological thresholds is seemingly the order of the day. Yet, it is clearly not enough to lament the excessive economic use and human domination of ecosystems and sit as if in sackcloth and ashes while romanticizing the days gone by.

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  • A dual fluidized beds system essentially comprises of two fluidized bed reactors coupled together with a provision of gas or materials transfer in between. It may be a combination of circulating-circulating or bubbling-circulating or bubbling-bubbling type systems. A noble application is in a gasification process for coal or biomass where nitrogen of air is not allowed to dilute the product gas.

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  • The energy demand for the endothermic gasification reaction is met by the combustion of residual char in the fast bed combustor. The circulating bed materials act as heat carrier between the two fluidized beds and maintain the required temperature in gasifier. Therefore, the hydrodynamics of such a dual fluidized beds system needs to be thoroughly understood for successful design and operation of the system for industrial application.

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  • Solar energy refers primarily to the use of solar radiation for practical ends. However, all renewable energies, other than geothermal and tidal, derive their energy from the sun. Solar technologies are broadly characterized as either passive or active depending on the way they capture, convert and distribute sunlight. Active solar techniques use photovoltaic panels, pumps, and fans to convert sunlight into useful outputs.

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