Techno-economic analysis of gas turbine-based chp plant operation under a feed-in tariff system

This paper deals with the techno-economic analysis of gas turbine-based combined heat and power production, within a current local legislation frame for the promotion of such production of energy in the Republic of Serbia. Since the legislation includes plants with electric power below 10 MW, an overview of the relevant technical characteristics for a number of appropriate gas turbines was prepared. The relevant thermodynamic parameters are calculated in order to estimate the economic feasibility of combined heat and power production using these plants. The production cost of useful heat is determined by taking into account the incomes from the sale of electricity to the electric grid under a feed-in tariff. It is compared with the production cost from an equivalent boiler for the separate production of the heat. One of the main objectives is to determine the effectiveness of the implemented legislative measures in the promotion of combined production of heat and power. Clear conclusions were drawn based on the results obtained

Techno-economic analysis of gas turbine-based chp plant operation under a feed-in tariff system

This paper deals with the techno-economic analysis of gas turbine-based combined heat and power production, within a current local legislation frame for the promotion of such production of energy in the Republic of Serbia. Since the legislation includes plants with electric power below 10 MW, an overview of the relevant technical characteristics for a number of appropriate gas turbines was prepared. The relevant thermodynamic parameters are calculated in order to estimate the economic feasibility of combined heat and power production using these plants. The production cost of useful heat is determined by taking into account the incomes from the sale of electricity to the electric grid under a feed-in tariff. It is compared with the production cost from an equivalent boiler for the separate production of the heat. One of the main objectives is to determine the effectiveness of the implemented legislative measures in the promotion of combined production of heat and power. Clear conclusions were drawn based on the results obtained

Size distribution of agglomerates of milk powder in wet granulation process in a vibro-fluidized bed

Results of experiments on the influence of technological parameters (intensity of vibration, granulation of the liquid feed, temperature of fluidization agent) on the change of size distribution, as well as mass mean diameter of the milk powder particles subjected to the wet granulation process (agglomeration) in a vibro-fluidized bed granulator are shown in this paper. Using water as a granulation liquid and air as a fluidization agent, it was found that mass mean diameter increases with increase of water feed, intensity of vibration, and decrease of air temperature. Increasing the intensity of vibration and decreasing the air temperature, primarily induces the increase of the dimensions of the initial nuclei. This can be explained on the basis of different influences that these changes (velocity of particle motion, intensity of particle collision, drying rate) have on the coalescence of particles with smaller and/or bigger dimensions

Simulation of solar water heating system

U radu je prikazan matematički model rada solarnog sistema za zagrevanje vode. Analizirani solarni sistem sadrži ravne solarne kolektore, dva akumulaciona rezervoara za vodu, spoljašnji razmenjivač toplote i dopunski izvor energije. Primenjeni model omogućava simulaciju rada i određivanje odgovarajućih energetskih pokazatelja rada sistema i njegovih elemenata za različite lokacije (klimatske uslove), orijentaciju kolektora, termičkih karakteristika komponenata sistema, kao i različitu dinamiku korišćenja tople vode. Rezultati simulacije su prikazani za dane tipične meteorološke godine za Beograd i dnevni profil korišćenja tople vode. Prikazana je analiza energetskih karakteristika sistema. Rezultati dobijeni numeričkom simulacijom su poređeni sa rezultatima dobijenim primenom f-chart metode proračuna.The paper presents a mathematical model of the solar water heating system. The analyzed solar system consists of flat collectors, two water storage tanks, outer heat-exchanger and a source of auxiliary energy. The implemented model enables simulation of system operation and determination of appropriate energy characteristics of the system and its elements for different locations (climatic data), orientations of collectors, thermal characteristics of system components, as well as different dynamics of hot water consumption. Results of the simulation are presented for the days of a typical meteorological year for Belgrade and the daily profile of hot water consumption. The analysis of the energy performances of the system is presented. The results obtained by simulation were compared with the results obtained with the -chart method of calculation

Simulation of solar water heating system

U radu je prikazan matematički model rada solarnog sistema za zagrevanje vode. Analizirani solarni sistem sadrži ravne solarne kolektore, dva akumulaciona rezervoara za vodu, spoljašnji razmenjivač toplote i dopunski izvor energije. Primenjeni model omogućava simulaciju rada i određivanje odgovarajućih energetskih pokazatelja rada sistema i njegovih elemenata za različite lokacije (klimatske uslove), orijentaciju kolektora, termičkih karakteristika komponenata sistema, kao i različitu dinamiku korišćenja tople vode. Rezultati simulacije su prikazani za dane tipične meteorološke godine za Beograd i dnevni profil korišćenja tople vode. Prikazana je analiza energetskih karakteristika sistema. Rezultati dobijeni numeričkom simulacijom su poređeni sa rezultatima dobijenim primenom f-chart metode proračuna.The paper presents a mathematical model of the solar water heating system. The analyzed solar system consists of flat collectors, two water storage tanks, outer heat-exchanger and a source of auxiliary energy. The implemented model enables simulation of system operation and determination of appropriate energy characteristics of the system and its elements for different locations (climatic data), orientations of collectors, thermal characteristics of system components, as well as different dynamics of hot water consumption. Results of the simulation are presented for the days of a typical meteorological year for Belgrade and the daily profile of hot water consumption. The analysis of the energy performances of the system is presented. The results obtained by simulation were compared with the results obtained with the -chart method of calculation

Low temperature hydronic heating system with radiators and geothermal ground source heat pump

Upotreba grejnog sistema s toplotnom pumpom i zemljom kao izvorom energije bez obzira na relativno nisku temperaturu raspoloživog "izvora" geotermalne energije (temperatura vode ili tla ne mora biti viša od 12°C), omogućava da se 50-80% energije potrebne za grejanje preuzme od zemlje, a da se ostatak nadomeštava električnom energijom. Ovaj udeo geotermalne energije, u ukupnoj energiji potrebnoj za grejanje, zavisi pre svega od sistema njene dalje raspodele (radijatorski sistem, sistem grejanja pomoću fancoil-a ili zidno i podno grejanje), a tek potom i od temperature vode, odnosno tla. U radu je data uporedna analiza termičke efikasnosti dva sistema centarlnog grejanja sa radijatorima kao grejnim telima, visokotemperturnog kotlovskog sistema grejanja (90°C/70°C) i niskotemperaturnog sistema sa toplotnom pumpom i zemljom kao izvorom energije (65°C/55°C, 55°C/45°C ili 50°C/45°C).The use of a system with a geothermal ground source heat pump, regardless of the relatively low temperature of the available source of geothermal energy (water or ground temperature does not need to exceed 12°C), allows 50-80% of the energy required for heating to be taken from the ground, while the remaining amount is provided by electrical energy. This share of geothermal energy, in the total energy required for heating, primarily depends on the system of its further distribution (radiator system, fan coil heating system or wall and floor heating), and secondarily on water and ground temperature. The paper deals with the comparative analysis of thermal efficiency of two water central-heating systems with radiators, a conventional high-temperature heating system with a boiler (90°C/70°C) and a low-temperature heating system with a geothermal ground source heat pump ( 65°C/55°C, 55°C/45°C or 50°C/45°C)

Analysis of operation of the condenser in a 120 mw thermal power plant

The condenser plant has a huge impact on the economy of a steam turbine power plant. Deterioration of the parameters during operation could lead to a significant decrease in electrical output and to an increase in the heat rate of the thermal power plant. Detailed calculations of the performance under different operating conditions were carried out for the condenser of the Morava thermal power plant. Comprehensive testing of the condenser was carried out and experimental data were compared with the numerical results. The effects of deviations in the condenser behavior on the main thermodynamic parameters and the overall economics of the power plant were evaluated. Guidelines for operation of condensation plants are given in the conclusion

Low temperature hydronic heating system with radiators and geothermal ground source heat pump

Upotreba grejnog sistema s toplotnom pumpom i zemljom kao izvorom energije bez obzira na relativno nisku temperaturu raspoloživog "izvora" geotermalne energije (temperatura vode ili tla ne mora biti viša od 12°C), omogućava da se 50-80% energije potrebne za grejanje preuzme od zemlje, a da se ostatak nadomeštava električnom energijom. Ovaj udeo geotermalne energije, u ukupnoj energiji potrebnoj za grejanje, zavisi pre svega od sistema njene dalje raspodele (radijatorski sistem, sistem grejanja pomoću fancoil-a ili zidno i podno grejanje), a tek potom i od temperature vode, odnosno tla. U radu je data uporedna analiza termičke efikasnosti dva sistema centarlnog grejanja sa radijatorima kao grejnim telima, visokotemperturnog kotlovskog sistema grejanja (90°C/70°C) i niskotemperaturnog sistema sa toplotnom pumpom i zemljom kao izvorom energije (65°C/55°C, 55°C/45°C ili 50°C/45°C).The use of a system with a geothermal ground source heat pump, regardless of the relatively low temperature of the available source of geothermal energy (water or ground temperature does not need to exceed 12°C), allows 50-80% of the energy required for heating to be taken from the ground, while the remaining amount is provided by electrical energy. This share of geothermal energy, in the total energy required for heating, primarily depends on the system of its further distribution (radiator system, fan coil heating system or wall and floor heating), and secondarily on water and ground temperature. The paper deals with the comparative analysis of thermal efficiency of two water central-heating systems with radiators, a conventional high-temperature heating system with a boiler (90°C/70°C) and a low-temperature heating system with a geothermal ground source heat pump ( 65°C/55°C, 55°C/45°C or 50°C/45°C)