Investigation of construction waste recycling decisions by considering consumers’ quality perceptions

Process design and energy requirement for a practical plant are investigated for an energy-saving drying (dewatering) process invented by the authors in 2002 for high-moisture porous materials. The basic concept of the process involves the extraction of water from a high-moisture porous material by bringing it in physical contact with liquefied dimethyl ether (DME) at room temperature. Water content of DME asymptotically increases to the saturation value and the high-moisture porous material is dried almost perfectly. DME from the DME-water mixture is vaporized by decompression. DME and water are separated by flash distillation. DME vapor is compressed and cooled in a heat exchanger, and the latent heat of condensation is reused to vaporize the DME in the heat exchanger. Multistage compression and multistage flash distillation are employed. After compression, the temperature of DME is less than 50 °C. Because specific heat ratio of DME is only 1.11, the energy consumption of the compressor is reduced. Considering the adiabatic efficiency of the compressor and the net thermal efficiency, the total energy for dewatering is about 1100 kJ per 1-kg-water-content of the material being dewatered This process has significant potential and is compact than the existing dewatering processes.

/pdf/energy-saving-drying-technology-for-porous-media-using-2rx37kazh2.pdf

Energy-saving drying technology for porous media using liquefied DME gas

A crucial consideration of businesses that wish to remain competitive in world markets is how to develop the skills of cooperation. This cooperative stance affects how a business relates to its customers, its suppliers, its employees, all concerned government agencies, and its neighbors. Internally, a company needs to develop systems that will reward team work and team development, rather than individual performance and intergroup competition. Most of us have been in educational systems that are based upon assumptions of competition as they track to success. Fortunately, the skills of cooperation can be identified and developed in each of us. Three such skills that are useful in work group settings are highlighted here. They will aid anyone who is concerned about becoming a good team member and team developer. The broader questions must be asked to begin to change organizational systems of what behaviors receive recognition and what behaviors are generally punished. In any organization, when teamwork begins to operate well, even a small group can affect the overall corporate culture and produce longterm change.

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