scholarly journals Improvement research of condensing equipment in organic Rankine cycle power generation systems

2019 ◽  
pp. 379-379
Author(s):  
Jiaqi Zhang ◽  
Wei Zhang ◽  
Xinli Lu ◽  
Yu Ren ◽  
Dawei Guo
Keyword(s):  
Power Generation ◽  
Pressure Loss ◽  
Cooling Tower ◽  
Cooling Water ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Net Generation ◽  
Cycle Systems ◽  
Power Generation Systems ◽  
Closed Wet Cooling Tower

Dry hot rock power generation is an important part of geothermal energy application, and condenser has become an important part of the system because it can provide a lower outlet back pressure for steam turbine, and improve the power generation of the system. Engineering Equation Solver is applied to assess the performance of cooling towers for organic Rankine cycle power generation systems. In the present study, two models with different cooling towers are considered: In the first model, the predicted performance of the opening cooling tower for organic Rankine cycle systems is studied and compared with the experimental measurement for a 500 kW system. In the second model, because of the high mass flow of the cooling water and high energy consumption of the cooling water pump for the opening cooling tower, the predicted performance of the closed wet cooling tower to replace the opening cooling tower for organic Rankine cycle systems is studied. The models are capable of predicting the variation of evaporation and condensation temperatures, the pressure loss of heat exchangers. R123, R227ea, R245fa, R600 and R600a are tested as working fluids. The results show that the second model reduces the energy consumption of the cooling water pump, and it also improves the net power generation and net generation efficiency for using R227ea, R600, R600a. However, with the increase of the closed wet cooling tower pressure loss, both the net power generation and net generation efficiency decrease. Therefore, different working fluids are suitable for different pressure loss.

Modeling Power Generation Water Usage

2015 ◽  
Author(s):  
Jaron J. Peck ◽  
Amanda D. Smith
Keyword(s):  
Power Generation ◽  
Thermoelectric Power ◽  
Power Output ◽  
Power Plants ◽  
Cooling Tower ◽  
Cooling Water ◽  
Rankine Cycle ◽  
Closed Circuit ◽  
Cooling Systems ◽  
Temperature Range

Climate change can have a large effect on thermoelectric power generation. Typical thermoelectric power plants rely on water to cool steam in the condenser in order to produce electricity. Increasing global temperatures can increase average water temperatures as well as decrease the amount of water available for cooling due to evaporation. It is important to know how these parameters can affect power generation and efficiency of power systems, especially when assessing the water needs of a plant for a desired power output and whether a site can fulfill those needs. This paper explains the development of a model that shows how power and efficiency are affected due to changing water temperature and water availability for plants operating on a Rankine cycle. Both a general model of the simple Rankine cycle as well as modifications for regeneration and feedwater heating are presented. Power plants are analyzed for two different types of cooling systems: once-through cooling and closed circuit cooling with a cooling tower. Generally, rising temperatures in cooling water have been found to lower power generation and efficiency. Here, we present a method for quantifying power output and efficiency reductions due to changes in cooling water flow rates or water temperatures. Using specified plant parameters, such as boiler temperature and pressure, power and efficiency are modeled over a 5°C temperature range of inlet cooling water. It was found that over this temperature range, power decrease ranged from 2–3.5% for once through cooling systems, depending on the power system, and 0.7% for plants with closed circuit cooling. This shows that once-through systems are more vulnerable to changing temperatures than cooling tower systems. The model is also applied to Carbon Plant, a coal fired power plant in Utah that withdraws water from the Price River, to show how power and efficiency change as the temperature of the water changes using USGS data obtained for the Price River. The model can be applied to other thermoelectric power stations, whether actual or proposed, to investigate the effects of water conditions on projected power output and plant efficiency.

scholarly journals Organic Rankine Cycle (ORC) System Applications for Solar Energy: Recent Technological Advances

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2930 ◽  
Author(s):  
T. M. I. Mahlia ◽  
H. Syaheed ◽  
A. E. Pg Abas ◽  
F. Kusumo ◽  
A. H. Shamsuddin ◽  
...  
Keyword(s):  
Power Generation ◽  
Solar Energy ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Selection Processes ◽  
Technological Advances ◽  
Patent Landscape ◽  
Parabolic Dish ◽  
Linear Fresnel Reflector ◽  
Power Generation Systems

Organic Rankine Cycle (ORC) power generation systems may be used to utilize heat source with low pressure and low temperature such as solar energy. Many researchers have focused on different aspects of ORC power generation systems, but none so far has focused on the patent landscape of ORC system applications. As such, the objective of this study is to identify published patents on ORC system applications, particularly for solar energy. Four (4) technologies were identified in ORC application for solar energy: parabolic dish, parabolic trough, solar tower, and linear Fresnel reflector. A methodical search and analysis of the patent landscape in ORC system applications for solar energy published between 2007–2018 was conducted using the Derwent Innovation patent database. From the approximately 51 million patents in the database from various countries and patent agencies, 3859 patents were initially identified to be related to ORC applications for solar energy. After further stringent selection processes, only 1100 patents were included in this review. From these 1100 patents, approximately 12% (130 patents) are associated with parabolic dishes, about 39% (428 patents) are associated with parabolic troughs, approximately 21% (237 patents) are associated with solar towers, and about 28% (305 patents) are associated with linear Fresnel reflectors. Published patents on solar tower technology are currently on an increasing trend, led by China. All of these patents were published in the past 11 years. From this study, further researches on ORC application are still ongoing, but ORC application for solar energy has the potential to advance; allowing the world to ease issues related to over-reliance on fossil fuel.

Magnetic Thrust Bearing for the ORC High – Speed Microturbine

2013 ◽  
Vol 198 ◽  
pp. 348-353 ◽  
Author(s):  
Zbigniew Kozanecki ◽  
Jakub Łagodziński
Keyword(s):  
Power Generation ◽  
High Speed ◽  
Thrust Bearing ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Fem Modeling ◽  
Small Power ◽  
Power Generation Systems

The paper is devoted to the FEM modeling of a magnetic thrust bearing for the small power, high-speed microturbine, working in the Organic Rankine Cycle. The microturbine is used to produce electricity in small dissipated power generation systems.

Development, experimental testing and techno-economic assessment of a fully automated marine organic rankine cycle prototype for jacket cooling water heat recovery

Energy ◽  
2021 ◽  
Vol 228 ◽  
pp. 120596
Author(s):  
Platon Pallis ◽  
Efstratios Varvagiannis ◽  
Konstantinos Braimakis ◽  
Tryfonas Roumpedakis ◽  
Aris - Dimitrios Leontaritis ◽  
...  
Keyword(s):  
Heat Recovery ◽  
Experimental Testing ◽  
Cooling Water ◽  
Organic Rankine Cycle ◽  
Economic Assessment ◽  
Rankine Cycle

scholarly journals Comparative investigation of working fluids for an organic Rankine cycle with geothermal water

2015 ◽  
Vol 36 (2) ◽  
pp. 75-84
Author(s):  
Yan-Na Liu ◽  
Song Xiao
Keyword(s):  
Power Generation ◽  
Pressure Ratio ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Comparative Investigation ◽  
Geothermal Water ◽  
Thermodynamic Investigation ◽  
Working Fluids ◽  
Temperature Heat ◽  
Input Pressure

AbstractIn this paper, the thermodynamic investigation on the use of geothermal water (130 °C as maximum) for power generation through a basic Rankine has been presented together with obtained main results. Six typical organic working fluids (i.e., R245fa, R141b, R290, R600, R152a, and 134a) were studied with modifying the input pressure and temperature to the turbine. The results show that there are no significant changes taking place in the efficiency for these working fluids with overheating the inlet fluid to the turbine, i.e., efficiency is a weak function of temperature. However, with the increasing of pressure ratio in the turbine, the efficiency rises more sharply. The technical viability is shown of implementing this type of process for recovering low temperature heat resource.

Categorization and analysis of heat sources for organic Rankine cycle systems

2016 ◽  
Vol 64 ◽  
pp. 790-805 ◽  
Author(s):  
Huixing Zhai ◽  
Qingsong An ◽  
Lin Shi ◽  
Vincent Lemort ◽  
Sylvain Quoilin
Keyword(s):  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Heat Sources ◽  
Cycle Systems
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