Rechear on Solar-Low Temperature Waste Heat Electric Power Generation System

2010 ◽  
Vol 171-172 ◽  
pp. 512-517
Author(s):  
Xin Yu Li ◽  
Jie Xu ◽  
Cao Gu ◽  
Long Liu
Keyword(s):  
Power Generation ◽  
Low Temperature ◽  
Electric Power ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Working Fluid ◽  
Generation System ◽  
Electric Power Generation ◽  
Boiling Points ◽  
Power Generation System

This paper presents our recent research results about a solar-low temperature waste electric power generation system based on Organic Rankine Cycle (ORC) which utilizes solar thermal waste heat at low temperature efficiently. Four organic working fluids such as R13a, isobutene, HFC-245fa and HFC-236ea with boiling points from 247.08K-288.05K are chosen to analyze the performance of the system according to first and second law of thermodynamics under rated conditions. The results show that raising temperatures of high-press gas turbine cannot improve thermal efficiencies of the system obviously, meanwhile the irreversibility of the system increases. And adjusting the intermediate pressure can influence the system's performance importantly. When the reheating pressure reaches the 75%-85% of the critical pressure, the system get the best optimal performance. On the other hand, when the condensate temperature increases, the system thermal performance drops. The higher working fluid boiling points can cause the higher system thermal efficiency.

Analysis and Optimization of ORC for Low-Temperature Waste Heat Power Generation

2011 ◽  
Vol 383-390 ◽  
pp. 6614-6620
Author(s):  
Xin Ling Ma ◽  
Xiang Rui Meng ◽  
Xin Li Wei ◽  
Jia Chang ◽  
Hui Li
Keyword(s):  
Power Generation ◽  
Low Temperature ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Inlet Temperature ◽  
Heat Power ◽  
Generation System ◽  
Power Generation System

This paper presents energy analysis, thermodynamic calculation and exergy analysis for waste heat power generation system of Organic Rankine Cycle based on the first and second laws of thermodynamics. In order to improve system performance, for low-temperature waste heat of 120°C and R245fa organic working fluid, using Aspen Plus software conducted simulation, optimization and improvement. Results from these analyses show that decreasing the expander inlet temperature, increasing inlet pressure of the expander, and adding regenerative heater can increase thermal and exergy efficiencies, at the same time reduce system irreversibility.

Evaluation of Electric Power Generation System by Biomass

1997 ◽  
pp. 1582-1589
Author(s):  
K. Yamada ◽  
T. Akiyama ◽  
R. Kato ◽  
T. Kawakami ◽  
M. Sugiyama ◽  
...  
Keyword(s):  
Power Generation ◽  
Electric Power ◽  
Generation System ◽  
Electric Power Generation ◽  
Power Generation System

Structural Design and Porting Parameters Calculation of a Micro Piston Engine for Power Generation

2007 ◽  
Author(s):  
Jiuhong Wang ◽  
Dejiang Lu ◽  
Zhuangde Jiang
Keyword(s):  
Power Generation ◽  
Electric Power ◽  
Mechanical Energy ◽  
Connecting Rod ◽  
Generation System ◽  
Piston Engine ◽  
Electric Power Generation ◽  
Exhaust Port ◽  
Power Generation System ◽  
Phase Angles

In this paper, a new type micro piston internal combustion engine is reported. The micro engine can be used to provide mechanical energy for micro electric power generation system. It is consisted of three or four planar plate structure. This micro engine has special advantages in structure which are more suitable to minimize whole engine to MEMS dimensions than traditional engines. Compared with traditional or other existing micro piston engines, there is a sliding chute and crank mechanism rather than a crank and connecting rod mechanism to improve the space utilization ratio. The crank is fixed on the plate next to the main body plate of the engine. A free piston micro engine without the crank and connecting rod mechanism is given too. Scheme of structure, operation and characters of the micro engine are described in detail. The displacement, velocity and acceleration functions of piston are deduced to understand the rules of piston motion. Calculating formulas of porting parameters are deduced too. Finally, an example of the micro engine with specific design parameters is given. Mathematic modeling of the porting parameters is built. The calculation results show that the phase angles of the inlet, scavenging port and the exhaust port of the example engine are respectively of 21.78°, 156.27° and 158.39° under following conditions. Compression ratio is 5; working volume is 5mm3; length of stroke is 2mm; the sectional dimension of the piston is 2mm×1mm; and the value of revolution is 9000RPM. When the width of gas ports are all 1mm, the heights of inlet, scavenging port and exhaust port corresponding to the port phase angles above are respectively 72μm, 85μm, and 70μm. According to the assembly testing on computer, it is shown that the micro piston engine presented here is workable, controllable and suitable for MEMS fabrication in structure. It can be used as device to provide mechanical energy for micro electric power generation system.

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