Study and Selection of Working Fluids for Organic Rankine Cycle (ORC) Using Engine Waste Heat Energy

2012 ◽  
Vol 468-471 ◽  
pp. 3113-3116
Author(s):  
Kai Yang ◽  
Jian Zhang ◽  
Hong Guang Zhang ◽  
Yan Chen ◽  
Bin Liu ◽  
...  
Keyword(s):  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Exhaust Gas ◽  
Heat Absorption ◽  
Main Criterion ◽  
Working Fluids ◽  
Single Screw ◽  
The Mathematical Model ◽  
Selection Of

In this paper, a basic ORC system is proposed to recover the exhaust gas energy of vehicle engines, and the mathematical model of the ORC system is built. Thirteen working fluids are analyzed. The main criterion for selecting working fluids is the mass flow rate and the heat absorption rate under the same power output of single-screw expander. Then, the paper presents an analysis of the irreversibility rate and thermal efficiency of the ORC system using 4 different organic working fluids.

scholarly journals Comparative analysis of working fluids for efficient waste heat recovery

2021 ◽  
Vol 2057 (1) ◽  
pp. 012102
Author(s):  
D Ye Lola ◽  
A Yu Chirkov ◽  
Yu A Borisov
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Exhaust Gas ◽  
Water Cooling ◽  
Working Fluids ◽  
Gas Recovery ◽  
Recovery System

Abstract The paper analyzes the implementation of plants with an organic Rankine cycle (ORC) on the example of the circuit of the regenerative gas turbine unit and exhaust gas recovery system of the compressor system of the gas-compressor unit. The theoretically achievable values of power generated by the ORC-installations are determined. A criterion is presented for comparing the working fluids according to the efficiency of use in ORC-installations. To evaluate the overall characteristics of the system, the parameters of heat exchangers for air and water cooling were determined. As a result, it is concluded that the use of ORC-installations allows to utilize up to 23% of the heat of exhaust gases (convert into useful work).

Study of Gasoline Engine Waste Heat Recovery by Organic Rankine Cycle

2011 ◽  
Vol 383-390 ◽  
pp. 6071-6078
Author(s):  
E. H. Wang ◽  
H. G. Zhang ◽  
B. Y. Fan ◽  
H. Liang ◽  
M. G. Ouyang
Keyword(s):  
Automobile Industry ◽  
Gasoline Engine ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Outlet Temperature ◽  
Exhaust Gas ◽  
Environment Protection ◽  
The Mathematical Model

Energy saving and environment protection are two important issues that today’s automobile industry must emphasize. Lots of heat energy waste with the exhaust gas when the engine is running. If this part of waste heat can be recovered, the energy efficiency will be improved. Thus plenty of energy can be saved and the global warming also can be reduced. In this paper, the organic Rankine cycle whose working fluid was R245fa was studied. It was adopted to recover the gasoline engine waste heat. The mathematical model of the organic Rankine cycle was built up in Matlab to search the optimized working condition. The pinch analysis method was used to analyze the outlet temperature of the exhaust gas. The results indicate that organic Rankine cycle is a good way to recover the gasoline engine waste heat, especially in the high load conditions. The temperature of the exhaust gas can be apparently decreased.

Research of Two Stage Single Screw Expander Organic Rankine Cycle System Scheme Based on the Waste Heat Recovery of Diesel Engine’s Exhaust Gas

2011 ◽  
Vol 201-203 ◽  
pp. 600-605 ◽  
Author(s):  
Hong Guang Zhang ◽  
Hong Liang ◽  
Xing Liu ◽  
Bin Liu ◽  
Yan Chen ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Exhaust Gas ◽  
Two Stage ◽  
Combustion Heat ◽  
Single Screw ◽  
Exhaust Heat

According to the analysis of heat balance, about 1/3 of the fuel combustion heat is taken away into the ambience by exhaust gas of diesel engine. In this article, to improve the using level of the fuel’s combustion heat, a two stage single screw expander organic Rankine cycle (ORC) system has been used to recover the waste heat from exhaust gas of a certain turbine diesel engine. In this article, physical model of the recovery system was built at first, then the T-S curve was drawn, at last, REFPROP was used to calculate thermodynamics parameter in different state point of this system, and analyze the whole system’s thermodynamics character. By analyzing, the evaporation temperature of this system should be optimized to get the relatively evaporation press; by calculating, it could be seen that the middle heater in this system should be taken away to improve the economy of this scheme. This scheme should supply a direction for the exhaust heat recovery of diesel engine.

Characterizing the performance of a single-screw expander in a small-scale organic Rankine cycle for waste heat recovery

2016 ◽  
Vol 181 ◽  
pp. 155-170 ◽  
Author(s):  
D. Ziviani ◽  
S. Gusev ◽  
S. Lecompte ◽  
E.A. Groll ◽  
J.E. Braun ◽  
...  
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Single Screw

Optimization of Cycle and Expander Design of an Organic Rankine Cycle Unit Using Multi-Component Working Fluids

2016 ◽  
Author(s):  
Andrea Meroni ◽  
Jesper Graa Andreasen ◽  
Leonardo Pierobon ◽  
Fredrik Haglind
Keyword(s):  
Low Temperature ◽  
Power Systems ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Fluid Temperature ◽  
Heat Sources ◽  
Working Fluids ◽  
Turbine Performance ◽  
Temperature Heat

Organic Rankine cycle (ORC) power systems represent attractive solutions for power conversion from low temperature heat sources, and the use of these power systems is gaining increasing attention in the marine industry. This paper proposes the combined optimal design of cycle and expander for an organic Rankine cycle unit utilizing waste heat from low temperature heat sources. The study addresses a case where the minimum temperature of the heat source is constrained and a case where no constraint is imposed. The former case is the waste heat recovery from jacket cooling water of a marine diesel engine onboard a large ship, and the latter is representative of a low-temperature geothermal, solar or waste heat recovery application. Multi-component working fluids are investigated, as they allow improving the match between the temperature profiles in the heat exchangers and, consequently, reducing the irreversibility in the ORC system. This work considers mixtures of R245fa/pentane and propane/isobutane. The use of multi-component working fluids typically results in increased heat transfer areas and different expander designs compared to pure fluids. In order to properly account for turbine performance and design constraints in the cycle calculation, the thermodynamic cycle and the turbine are optimized simultaneously in the molar composition range of each mixture. Such novel optimization approach enables one to identify to which extent the cycle or the turbine behaviour influences the selection of the optimal solution. It also enables one to find the composition for which an optimal compromise between cycle and turbine performance is achieved. The optimal ORC unit employs pure R245fa and provides approximately 200 kW when the minimum hot fluid temperature is constrained. Conversely, the mixture R245fa/pentane (0.5/0.5) is selected and provides approximately 444 kW when the hot fluid temperature is not constrained to a lower value. In both cases, a compact and efficient turbine can be manufactured.

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