Advances in highly permeable reverse osmosis (RO) membranes have enabled desalting operations, in which it is practically feasible for the applied pressure to approach the osmotic pressure of the exit brine stream. However, energy cost remains a major contributor to the total cost of water produced by RO membrane desalination. Reduction of the overall cost of water production represents a major...

multistage stochastic programming is a key technology for making decisions over time in an uncertain environment. one of the promising areas in which this technology is implementable, is medium term planning of electricity production and trading where decision makers are typically faced with uncertain parameters (such as future demands and market prices) that can be described by stochastic proc...

On the base of studying multistage instrumental toothed mechanisms provided earlier computer-aided design of multistage gear drives, optimized by criterion of minimum volume is considered. The sowfware’s CAD-systems including computer programs for multistage gear drives of ledge wise, coaxial and orbital arrangements are developed. Different schemes of arrangement are analyzed and results of op...

In this paper we discuss computational complexity and risk averse approaches to two and multistage stochastic programming problems. We argue that two stage (say linear) stochastic programming problems can be solved with a reasonable accuracy by Monte Carlo sampling techniques while there are indications that complexity of multistage programs grows fast with increase of the number of stages. We ...

Isobaric expansion (IE) engines can directly convert heat into mechanical energy, making them particularly attractive for applications such as vapor-driven pumps and compressors. A recent initial assessment investigating the utilization of IE reciprocating compressors has revealed that vapor use efficiency is inherently low in case simplest direct-acting compressor designs. Based on this analys...

Multistage type cold storage is a refrigeration machine required in an industry because it functions to store food products for long time. Bali, as world tourist destination, will rely heavily on this cooling system preparing services tourists, especially the and beverage sector. designed reach evaporator temperature below -30oC thus used compressor performance must be able produce maximum effe...