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The ashes from the two agricultural residues barley straw and barley husk were characterized by applying a combination of different analytical methods. The two ashes are rich in K, Si, P, Ca, K with small amounts of Mg, Al, S and Cl. K bearing silicates and phosphates mineral phases were...

This review provides an overview of the lubricant on the heat transfer performance, including nucleate boiling, convective boiling, shell side condensation, forced convective condensation, and gas cooling, for conventional refrigerants and natural refrigerant R-744. Various parameters affecting the...

The existing power systems are challenged as the share at MV distribution level of distributed generation is increasing. In order to ensure the security of operation and power quality in these grids, transmission and distribution power system operators have issued connection and operation...

The goal of the IDEALHY project is to identify processes and components, which allow liquefying hydrogen with a power consumption much lower than with plants built so far. This requires comparing different possible processes concerning power efficiency, investment cost and compactness. The power...

An experimental and numerical investigation of the optimum ejector geometry for a small-capacity R744 heat pump was performed. Different ejector configurations were examined, including various lengths and diameters of the mixer and various angles of divergence for the diffuser. Based on a simplified...