The Experts below are selected from a list of 3195 Experts worldwide ranked by ideXlab platform
Donglai Zhang - One of the best experts on this subject based on the ideXlab platform.
-
a novel coupling method of power supplies with high power density efficiency and fast dynamic response for spacecraft hollow cathode power Supply applications
IEEE Transactions on Power Electronics, 2017Co-Authors: Donglai ZhangAbstract:This paper presents a coupling method of power supplies to improve power density, efficiency, and dynamic response by taking the case of Heater Supply, ignitor Supply, and keeper Supply for hollow cathode of an all electric propulsion (AEP) Hall thruster. The working principle and timing characteristic of the coupled Supply, as well as the three-loop control, current sampling and chopping switch control are also illustrated. With the proposed coupling method, the power density is improved since three supplies are coupled into one Supply. Additionally, the test on the coupled Supply prototype with 200 W maximum output power shows that the efficiency of the coupled Supply could reach up to 89.7%, increasing by 3.9%–14.2% as being compared with that of traditional three supplies with Heater current between 4 and 10 A, and the joint test of the coupled Supply with an AEP hall thruster proves the achievement of fast dynamic response and the ability to extend useful life of hollow cathode. Hence, the coupling method proposed in this paper could achieve the power Supply system with high power density, efficiency, and fast dynamic response.
Murdianto, Farid Dwi - One of the best experts on this subject based on the ideXlab platform.
-
AC-AC Voltage Controller of Power Supply for Heater on Drying System
'Universitas Ahmad Dahlan', 2018Co-Authors: Rakhmawati Renny, Murdianto, Farid DwiAbstract:The coconut fruits is very useful to be processed into cooking oil and it can meet the needs of cooking for Indonesia people, But before the coconuts processed into oil, The coconuts should be dried first. Usually the drying process is manually, that is dried in the sun. Unfortunately this way is not hygienic and can’t be done continuously, causing the coconut fungus overgrow. This paper proposes methode to solve the problem above.This research makes the dryer coconut fruitssystem by using the Heater.Dryer system used for dry some coconut fruits that must be reduced the water content up to 5%, this dry coconutis called copra. System requires Heater which will be regulated the temperature. Heater temperature setting is done by adjusting the Heater Supply voltage, and this is the task of ac to ac voltage controller. Ac to ac voltage controller is a circuit converter is capable converting ac voltage with value 220 Vrms at 50 Hz frequency and have waveform pure sinusoidal become ac voltage frequency at 50 Hz with an output voltage suitable with our need but the voltage waveform not impure sinusoidal or defective as a result firing angle effects. The output voltage which we set determines the value of the Heater temperature. The output voltage is set from the firing angle of the triac component using the addition and decreasing angle values. Based on the results of experiments that have been done, if the drying chamber which has volume 135.2 liters and the temperature regulated at 700 C then the Heater with a power requirement of 400 W should receive Supply 216 V from ac to ac voltage controller. So the triac of ac to ac voltage controller fired on 0.55 radians so that the to ac voltage controller that gets 220 V input voltage can produce 216 V output voltage
Rakhmawati Renny - One of the best experts on this subject based on the ideXlab platform.
-
AC-AC Voltage Controller of Power Supply for Heater on Drying System
'Universitas Ahmad Dahlan', 2018Co-Authors: Rakhmawati Renny, Murdianto, Farid DwiAbstract:The coconut fruits is very useful to be processed into cooking oil and it can meet the needs of cooking for Indonesia people, But before the coconuts processed into oil, The coconuts should be dried first. Usually the drying process is manually, that is dried in the sun. Unfortunately this way is not hygienic and can’t be done continuously, causing the coconut fungus overgrow. This paper proposes methode to solve the problem above.This research makes the dryer coconut fruitssystem by using the Heater.Dryer system used for dry some coconut fruits that must be reduced the water content up to 5%, this dry coconutis called copra. System requires Heater which will be regulated the temperature. Heater temperature setting is done by adjusting the Heater Supply voltage, and this is the task of ac to ac voltage controller. Ac to ac voltage controller is a circuit converter is capable converting ac voltage with value 220 Vrms at 50 Hz frequency and have waveform pure sinusoidal become ac voltage frequency at 50 Hz with an output voltage suitable with our need but the voltage waveform not impure sinusoidal or defective as a result firing angle effects. The output voltage which we set determines the value of the Heater temperature. The output voltage is set from the firing angle of the triac component using the addition and decreasing angle values. Based on the results of experiments that have been done, if the drying chamber which has volume 135.2 liters and the temperature regulated at 700 C then the Heater with a power requirement of 400 W should receive Supply 216 V from ac to ac voltage controller. So the triac of ac to ac voltage controller fired on 0.55 radians so that the to ac voltage controller that gets 220 V input voltage can produce 216 V output voltage
Zbigniew Buryn - One of the best experts on this subject based on the ideXlab platform.
-
conversion of coal fired power plants to cogeneration and combined cycle thermal and economic effectiveness
2011Co-Authors: Ryszard Bartnik, Zbigniew BurynAbstract:1. Introduction.- 2. Selection of Optimal Heating Structures for Modernization of Coal-Fired Power Stations to Cogeneration.- 3. Mathematical Model of a Power Unit with Rated Capacity of 370 MW After Its Modernization to Cogeneration and Combined-Cycle.- 4. Algorithm for the Calculation of an Optimum Structure of Heat Exchangers for the Modernization of a 370 MW Power Unit to Combined Heat and Power Cycle.- 5. Testing Calculations of the Mathematical Model of a Power Unit.- 6. Thermodynamic Analysis of a Combined Heat and Power Unit Using Extractions A2, A3 and Crossoverpipe IP-LP for Heater Supply.- 7. Economic Efficiency of a Power Unit Adapted to Cogeneration.- 8. Technical and Economical Effectiveness of Modernization 370 MW Power Unit Repowered by Gas Turbine with Their Modernization to Cogeneration.- 9. Technical and Economical Effectiveness of 370 MW Power Unit Repowered by Gas Turbine in Parallel System.- 10. Summary and Final Conclusions.
Ryszard Bartnik - One of the best experts on this subject based on the ideXlab platform.
-
conversion of coal fired power plants to cogeneration and combined cycle thermal and economic effectiveness
2011Co-Authors: Ryszard Bartnik, Zbigniew BurynAbstract:1. Introduction.- 2. Selection of Optimal Heating Structures for Modernization of Coal-Fired Power Stations to Cogeneration.- 3. Mathematical Model of a Power Unit with Rated Capacity of 370 MW After Its Modernization to Cogeneration and Combined-Cycle.- 4. Algorithm for the Calculation of an Optimum Structure of Heat Exchangers for the Modernization of a 370 MW Power Unit to Combined Heat and Power Cycle.- 5. Testing Calculations of the Mathematical Model of a Power Unit.- 6. Thermodynamic Analysis of a Combined Heat and Power Unit Using Extractions A2, A3 and Crossoverpipe IP-LP for Heater Supply.- 7. Economic Efficiency of a Power Unit Adapted to Cogeneration.- 8. Technical and Economical Effectiveness of Modernization 370 MW Power Unit Repowered by Gas Turbine with Their Modernization to Cogeneration.- 9. Technical and Economical Effectiveness of 370 MW Power Unit Repowered by Gas Turbine in Parallel System.- 10. Summary and Final Conclusions.