In this paper, an optimal control for gas turbine and compressor system using fuzzy logic, genetic algorithms have been suggested. Gas turbine compressor system is most widely used in chemical industries. The primary objective of this kind of setup is to control the flow rate of high pressure steam. Different controller architecture has been taken up to control the flow of gas. Firstly, a conve...

Fired steam generators are the dominating technology of coal combustion in power plants. This paper presents a model for pulverized coal fired steam generators in Modelica. The model components are designed as an extension of SiemensPower, a Modelica library for transient simulation of power plants. The focus is on coal combustion, gas-particle-flow and radiation heat transfer in the furnace. T...

Due to increasing economic pressures in natural gas production, there is a recognized demand for flow meters that are able to measure when a significant quantity of liquid is present in gas flows. The key issues are that the liquid quantity is often unknown and its presence can affect the operation of traditional dry gas meters making the gas flow readings inaccurate. A number of techniques are...

Stationary DC electric fields are determined by the resistivity distribution of the insulation materials. In the presence of interfaces between different insulation materials, charge accumulation at these boundary layers may have a significant influence on the electric field distribution and with it on the breakdown strength of the arrangement. In many previous works, surface charging of model ...

Motivated by closed-loop flow control applications, a new formulation of the proper orthogonal decomposition (POD) is presented which is capable of characterizing not only the controlled and natural states of a given flow but also the transient behavior between these states. This approach, which is termed temporal POD (TPOD) extracts the optimum frameof-reference and the temporal information re...

Different energy infrastructures, such as electricity, natural gas and local district heating systems utilized for the energy supply are most often planned and operated independently of each other. This paper addresses the optimization of combined electricity and natural gas networks. The couplings between the two energy infrastructures are taken into account with the novel concept of energy hu...

Background for the model: The model tries to determine optimal allocation of natural gas in the time horizon between 1 and 3 years by minimizing both • shortages of natural gas and • the direct costs of supplying natural gas. In order to obtain these goals, the time horizon is divided into smaller decision time periods whose durations depend on the following: • The uncertainty in future weather...

OBJECTIVE To assess the effects of gas flow during insufflation on peritoneal fluid and peritoneal tissue regarding transient thermal behavior and thin-film evaporation. The effects of laparoscopic gas on peritoneal cell desiccation and peritoneal fluid thin-film evaporation were analyzed. METHODS Measurment of tissue and peritoneal fluid and analysis of gas flow dynamics during laparoscopy. ...