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

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

Acceptance test of thermal performances and pressure drop of heat exchangers

U okviru rada prikazana je metodologija ispitivanja razmenjivača toplote u zavisnosti od cilja ispitivanja. Cilj ispitivanja prikazanog razmenjivača toplote je određivanje toplotnih performansi i pada pritiska razmenjivača toplote u radu. Prikazani zahtevi u pogledu mernih mesta, merenja veličina i opreme za merenje tih veličina prema evropskim standardima, kao i poređenje datih preformansi sa deklarisanim performansama prema evropskim normama. .This paper deals with the mode of research of heat exchangers depending of cause of research. The aim of the research is determination of thermal performances and pressure drop of heat exchanger in operation work. Here is shown requirements of measuring places, measured values, and equipments for measuring as well as comparison of performances with the declared performances according to European standards.

Istorijski razvoj Darsi-Vaisbahove jednačine za otpor strujanju fluida kroz cevovode

U članku je prikazan istorijski razvoj Darsi-Vaisbahove jednačine za otpor strujanju fluida kroz cevovode. Dat je kratki pregled evolucije izračunavanja koeficijenta trenja kroz doprinose niza istraživača i inženjera

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

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

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

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