Rectified ethanol production cost analysis

This paper deals with the impact of the most important factors of the total production costs in bioethanol production. The most influential factors are: total investment costs, price of raw materials (price of biomass, enzymes, yeast), and energy costs. Taking into account these factors, a procedure for estimation total production costs was establish. In order to gain insight into the relationship of production and selling price of bioethanol, price of bioethanol for some countries of the European Union and the United States are given

Modeling of the working cycle of the pressure-powered pump

This paper presents an analysis of working parameters of the pressure-powered pump. Mathematical models for determining the pump filling and discharge periods were developed and statistically compared to experimental results. The statistical parameters of the final correlation between here presented mathematical model and experimental results are in the acceptable range. Pump characteristics are presented in the common manner: in the form of the pump head vs. capacity diagram

Modeling of the working cycle of the pressure-powered pump

This paper presents an analysis of working parameters of the pressure-powered pump. Mathematical models for determining the pump filling and discharge periods were developed and statistically compared to experimental results. The statistical parameters of the final correlation between here presented mathematical model and experimental results are in the acceptable range. Pump characteristics are presented in the common manner: in the form of the pump head vs. capacity diagram

Thermoeconomic analysis of spiral heat exchanger with constant wall temperature

Thermoeconomic analysis of spiral heat exchanger is conducted. Different geometrical parameters, such as outer diameter, plate height, passage gap, etc. are used and varied in a wide range. Detailed thermal and total costs analyses were performed for two spiral heat exchanger with different process fluids (water and thermal oil) with temperature changes, while the wall temperature was kept constant (condensation). The results were shown graphically. It is determined that optimum values of number of entropy generation units correspond to minimum total annual cost. The optimal solution could be found in the recommended range of geometric sizes for defined inlet and outlet temperatures and process fluid-flow rate

Development of the heating system using geothermal energy

The paper presents the results achieved by the project financed by Ministry of Science and Environmental Protection of Serbia during the period 2003-2005. The purpose of the project was determination methodology for designing heating system using geothermal water. Achieved results were implemented in the demonstration installment in factory "Palanački kiseljak" in Smederevska Palanka, Serbia, using geothermal water from the well near by factory

Reboiler Separation Efficiencies for Binary Systems

Reboilers are essential for the proper work of distillation and stripping columns. Hereby the intensity of axial mixing along the reboiler (Peclet number) is used for the reboiler separation efficiency modeling and estimation for binary systems. Two fully worked examples show that the separation (Murphree) efficiency varies significantly depending on the adopted reboiler flow model. Murphree efficiency ranges between 1.40 and 0.663 in example 1, and between 1.962 and 1 in example 2. The general conclusion is that the reboiler performance must be considered carefully in the case of design of the new plants,as well as in the case of "brown field" projects

Heat Transfer Coefficient for Condensation of Steam on Freely Formed Falling Liquid Jets

This article presents the research results of direct contact condensation of steam on freely formed falling liquid jets. After the comparison of experimental data and open literature correlations it was concluded that published correlations does not provide accurate coverage of experimental data. A new correlation was established in the following form Nu= center dot[Re-L(1.175) center dot (mu(L)/mu(W))(1.175) + 17740] center dot We(G)(0.086)center dot Fr-L(0.023) center dot Ku(W)(1.14)/We(W)(0.098) center dot Pr-W(1.8). center dot(rho(L)/rho(W))(0.097) center dot (sigma(L)/sigma(W))(-0.12) center dot phi(H-LG/d(h)

Heat Transfer Coefficient for Condensation of Steam on Freely Formed Falling Liquid Jets

This article presents the research results of direct contact condensation of steam on freely formed falling liquid jets. After the comparison of experimental data and open literature correlations it was concluded that published correlations does not provide accurate coverage of experimental data. A new correlation was established in the following form Nu= center dot[Re-L(1.175) center dot (mu(L)/mu(W))(1.175) + 17740] center dot We(G)(0.086)center dot Fr-L(0.023) center dot Ku(W)(1.14)/We(W)(0.098) center dot Pr-W(1.8). center dot(rho(L)/rho(W))(0.097) center dot (sigma(L)/sigma(W))(-0.12) center dot phi(H-LG/d(h)

Techno-economic evaluation of residue exhaustion in batch rectification ethanol production plant

This paper presents the techno-economic optimization of batch plant for production of rectified alcohol based on the concentration of ethanol in residue. The aim of the analysis was to determine the extent to which it is economically profitable to exhaust the residual liquid in boiler. The "profit production" criterion is used for calculations

RECTIFIED ETHANOL PRODUCTION COST ANALYSIS

This paper deals with the impact of the most important factors of the total production costs in bioethanol production. The most influential factors are: total investment costs, price of raw materials (price of biomass, enzymes, yeast), and energy costs. Taking into account these factors, a procedure for estimation total production costs was establish. In order to gain insight into the relationship of production and selling price of bioethanol, price of bioethanol for some countries of the European Union and the United States are given