An improved CO2-based transcritical Rankine cycle (CTRC) used for engine waste heat recovery

Shu, Gequn; Shi, Lingfeng; Li, Xiaoya; Huang, Guangdai; Chang, Li-Wen

doi:10.1016/j.apenergy.2016.05.053

Cited by 117 publications

(34 citation statements)

References 30 publications

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“…For CO 2 , the high heating coefficient performance for high‐temperature heat source is obtained which shows the favorable performance of simultaneous recovering both jacket water and exhaust effectively. Shu et al performed study on the thermodynamic performance comparison of transcritical Rankine cycle using CO 2 and R123 as working fluid respectively and drew an important conclusion that CO 2 can obtain more than 90% utilization of both jacket water and exhaust. However, R123 showed weak recovery capability for jacket water.…”

Section: Introductionmentioning

confidence: 99%

“…The result showed that the smaller size of exchanger and turbine can be applied in CO 2 transcritical Rankine cycle and the performance was better in CO 2 transcritical Rankine cycle compared with R123, R32, R125 and so on. [21][22][23] The low expansion ratio and high energy density of CO 2 make it possible to meet the requirement of compact turbo-machinery and heat exchanger due to wonderful flow and transmission characteristics of CO 2 , for which minimization of engine waste heat recovery is achieved.…”

Section: Introductionmentioning

confidence: 99%

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How to select regenerative configurations of CO ₂ transcritical Rankine cycle based on the temperature matching analysis

Tian

Liu

et al. 2020

Int J Energy Res

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Summary CO2 transcritical Rankine cycle is regarded as a potential technology for internal combustion engines waste heat recovery, and its regenerative configurations present great prospect to increase the power output capacity. This paper proposed different regenerator layout configurations based on the temperature matching analysis, including low temperature regenerative transcritical Rankine cycle (LR‐TRC), high temperature regenerative transcritical Rankine cycle (HR‐TRC), dual regenerative transcritical Rankine cycle (DR‐TRC) and split dual regenerative transcritical Rankine cycle (SR‐TRC). Afterward, the thermodynamics, electricity production cost (EPC) and miniaturization performance are implemented. The results show that regenerative configurations have an effect on improving net power output and SR‐TRC obtained optimal value of net power output. For the perspective of economic performance, the greatest value is obtained for HR‐TRC among four regenerative configurations. As for the miniaturization performance, the total heat transfer area increment of LR‐TRC is the lowest. The comparative analysis results offer guidance for selecting optimal regenerative configurations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

How to select regenerative configurations of CO ₂ transcritical Rankine cycle based on the temperature matching analysis

Tian

Liu

et al. 2020

Int J Energy Res

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“…One type of working fluid that is currently attracting much attention is CO 2 due to its interesting material properties such as high gas phase density, small pressure ratio, and small liquid viscosity. These properties allow the WHR system to adopt extremely compact micro‐channel heat exchangers and turbomachinery, which can significantly increase the simplicity and compactness of the system . Hence, the CO 2 ‐based transcritical Rankine cycle (CTRC) for study was selected to be researched.…”

Section: Introductionmentioning

confidence: 99%

“…These properties allow the WHR system to adopt extremely compact microchannel heat exchangers and turbomachinery, which can significantly increase the simplicity and compactness of the system. 3 Hence, the CO 2 -based transcritical Rankine cycle (CTRC) for study was selected to be researched. However, the actual performance of the CTRC system is much worse than that calculated theoretically or purely tested in labs.…”

Section: Introductionmentioning

confidence: 99%

Compact potential of exhaust heat exchangers for engine waste heat recovery using metal foams

et al. 2019

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Summary To improve the practicability of the waste heat recovery system for internal combustion engines, the compact potential of exhaust heat exchangers using metal foams is investigated. In the present study, the performance of compact exhaust heat exchangers is compared with that of a conventional shell and tube heat exchanger in a real test bench. Both heat transfer and pressure drop performance are considered when assessing the performance of heat exchangers because these two factors normally show a trade‐off relationship when designing exhaust heat exchangers. Compared with the conventional heat exchanger, the compact heat exchanger can achieve a similar pressure drop, and at the same time the heat transfer is increased by 30%, whereas the volume and the weight are each reduced by 2/3. The performance of compact heat exchangers with six types of Ni metal foams is also investigated under different mass flow rates and thicknesses of the porous layer. Results show that the optimum compact heat exchanger enhances the comprehensive performance 1.9 times compared with original one. This study shows that metal foams have great potential in realizing a compact exhaust heat exchanger for engine waste heat recovery.

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“…Various cycle configurations using tCO 2 have been examined powered by different thermal energy resources, ie, waste heat recovery from engine, 19 waste heat recovery from a gas turbine, 20 geothermal energy, 21 solar energy with molten salt energy storage, 22 solar energy with LNG cold recovery, 23 and electro-thermal energy storage. Various cycle configurations using tCO 2 have been examined powered by different thermal energy resources, ie, waste heat recovery from engine, 19 waste heat recovery from a gas turbine, 20 geothermal energy, 21 solar energy with molten salt energy storage, 22 solar energy with LNG cold recovery, 23 and electro-thermal energy storage.…”

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confidence: 99%

Experimental investigation of solar‐assisted transcritical CO ₂ Rankine cycle for summer and winter conditions from exergetic point of view

2019

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This study deals with energy and exergy analysis of the experimental solarassisted Rankine cycle working with an environmentally friendly working fluid transcritical CO 2 . The experimental system consists of evacuated solar collectors, a heat recovery system, condenser, a pump, and an expansion valve to simulate the realistic turbine operation. The system was designed for electricity production and the heat supply for various applications. The experiments were made funder typical winter and summer days to evaluate seasonal system performance in Kyoto, Japan. According to the obtained results, the turbine capacity was calculated as 0.118 kW and 0.177 kW for winter and summer seasons.From the exergetic point of view, solar collectors were found to be the major contributor to the total exergy destruction with 96.32% for summer and 93.58% for the winter season. Therefore, the efforts should be focused on the collectors. Thus, any attempt for improving the system performance should be focused on solar collectors first. Furthermore, the exergetic efficiency of the overall system was calculated as 7.63% for the winter season and 4.08% for the summer season. As a result, the utilization of CO 2 in the energy conversion cycle can be sustainably developed and extended by providing a glimpse into the carbon-free clean energy future.

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An improved CO2-based transcritical Rankine cycle (CTRC) used for engine waste heat recovery

Cited by 117 publications

References 30 publications

How to select regenerative configurations of CO ₂ transcritical Rankine cycle based on the temperature matching analysis

How to select regenerative configurations of CO ₂ transcritical Rankine cycle based on the temperature matching analysis

Compact potential of exhaust heat exchangers for engine waste heat recovery using metal foams

Experimental investigation of solar‐assisted transcritical CO ₂ Rankine cycle for summer and winter conditions from exergetic point of view

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An improved CO2-based transcritical Rankine cycle (CTRC) used for engine waste heat recovery

Cited by 117 publications

References 30 publications

How to select regenerative configurations of CO 2 transcritical Rankine cycle based on the temperature matching analysis

How to select regenerative configurations of CO 2 transcritical Rankine cycle based on the temperature matching analysis

Compact potential of exhaust heat exchangers for engine waste heat recovery using metal foams

Experimental investigation of solar‐assisted transcritical CO 2 Rankine cycle for summer and winter conditions from exergetic point of view

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How to select regenerative configurations of CO ₂ transcritical Rankine cycle based on the temperature matching analysis

How to select regenerative configurations of CO ₂ transcritical Rankine cycle based on the temperature matching analysis

Experimental investigation of solar‐assisted transcritical CO ₂ Rankine cycle for summer and winter conditions from exergetic point of view