Performances of Transcritical Power Cycles with CO2-Based Mixtures for the Waste Heat Recovery of ICE

In the waste heat recovery of the internal combustion engine (ICE), the transcritical CO2 power cycle still faces the high operation pressure and difficulty in condensation. To overcome these challenges, CO2 is mixed with organic fluids to form zeotropic...

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Autores principales:	Jinghang Liu, Aofang Yu, Xinxing Lin, Wen Su, Shaoduan Ou
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	CO<sub>2</sub>-based mixtures transcritical power cycles waste heat recovery thermodynamic analysis Science Q Astrophysics QB460-466 Physics QC1-999
Acceso en línea:	https://doaj.org/article/aeff01f8a4ad47a897511a61a7681d29
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spelling	oai:doaj.org-article:aeff01f8a4ad47a897511a61a7681d292021-11-25T17:30:56ZPerformances of Transcritical Power Cycles with CO<sub>2</sub>-Based Mixtures for the Waste Heat Recovery of ICE10.3390/e231115511099-4300https://doaj.org/article/aeff01f8a4ad47a897511a61a7681d292021-11-01T00:00:00Zhttps://www.mdpi.com/1099-4300/23/11/1551https://doaj.org/toc/1099-4300In the waste heat recovery of the internal combustion engine (ICE), the transcritical CO<sub>2</sub> power cycle still faces the high operation pressure and difficulty in condensation. To overcome these challenges, CO<sub>2</sub> is mixed with organic fluids to form zeotropic mixtures. Thus, in this work, five organic fluids, namely R290, R600a, R600, R601a, and R601, are mixed with CO<sub>2</sub>. Mixture performance in the waste heat recovery of ICE is evaluated, based on two transcritical power cycles, namely the recuperative cycle and split cycle. The results show that the split cycle always has better performance than the recuperative cycle. Under design conditions, CO<sub>2</sub>/R290(0.3/0.7) has the best performance in the split cycle. The corresponding net work and cycle efficiency are respectively 21.05 kW and 20.44%. Furthermore, effects of key parameters such as turbine inlet temperature, turbine inlet pressure, and split ratio on the cycle performance are studied. With the increase of turbine inlet temperature, the net works of the recuperative cycle and split cycle firstly increase and then decrease. There exist peak values of net work in both cycles. Meanwhile, the net work of the split cycle firstly increases and then decreases with the increase of the split ratio. Thereafter, with the target of maximizing net work, these key parameters are optimized at different mass fractions of CO<sub>2</sub>. The optimization results show that CO<sub>2</sub>/R600 obtains the highest net work of 27.43 kW at the CO<sub>2</sub> mass fraction 0.9 in the split cycle.Jinghang LiuAofang YuXinxing LinWen SuShaoduan OuMDPI AGarticleCO<sub>2</sub>-based mixturestranscritical power cycleswaste heat recoverythermodynamic analysisScienceQAstrophysicsQB460-466PhysicsQC1-999ENEntropy, Vol 23, Iss 1551, p 1551 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	CO<sub>2</sub>-based mixtures transcritical power cycles waste heat recovery thermodynamic analysis Science Q Astrophysics QB460-466 Physics QC1-999
spellingShingle	CO<sub>2</sub>-based mixtures transcritical power cycles waste heat recovery thermodynamic analysis Science Q Astrophysics QB460-466 Physics QC1-999 Jinghang Liu Aofang Yu Xinxing Lin Wen Su Shaoduan Ou Performances of Transcritical Power Cycles with CO<sub>2</sub>-Based Mixtures for the Waste Heat Recovery of ICE
description	In the waste heat recovery of the internal combustion engine (ICE), the transcritical CO<sub>2</sub> power cycle still faces the high operation pressure and difficulty in condensation. To overcome these challenges, CO<sub>2</sub> is mixed with organic fluids to form zeotropic mixtures. Thus, in this work, five organic fluids, namely R290, R600a, R600, R601a, and R601, are mixed with CO<sub>2</sub>. Mixture performance in the waste heat recovery of ICE is evaluated, based on two transcritical power cycles, namely the recuperative cycle and split cycle. The results show that the split cycle always has better performance than the recuperative cycle. Under design conditions, CO<sub>2</sub>/R290(0.3/0.7) has the best performance in the split cycle. The corresponding net work and cycle efficiency are respectively 21.05 kW and 20.44%. Furthermore, effects of key parameters such as turbine inlet temperature, turbine inlet pressure, and split ratio on the cycle performance are studied. With the increase of turbine inlet temperature, the net works of the recuperative cycle and split cycle firstly increase and then decrease. There exist peak values of net work in both cycles. Meanwhile, the net work of the split cycle firstly increases and then decreases with the increase of the split ratio. Thereafter, with the target of maximizing net work, these key parameters are optimized at different mass fractions of CO<sub>2</sub>. The optimization results show that CO<sub>2</sub>/R600 obtains the highest net work of 27.43 kW at the CO<sub>2</sub> mass fraction 0.9 in the split cycle.
format	article
author	Jinghang Liu Aofang Yu Xinxing Lin Wen Su Shaoduan Ou
author_facet	Jinghang Liu Aofang Yu Xinxing Lin Wen Su Shaoduan Ou
author_sort	Jinghang Liu
title	Performances of Transcritical Power Cycles with CO<sub>2</sub>-Based Mixtures for the Waste Heat Recovery of ICE
title_short	Performances of Transcritical Power Cycles with CO<sub>2</sub>-Based Mixtures for the Waste Heat Recovery of ICE
title_full	Performances of Transcritical Power Cycles with CO<sub>2</sub>-Based Mixtures for the Waste Heat Recovery of ICE
title_fullStr	Performances of Transcritical Power Cycles with CO<sub>2</sub>-Based Mixtures for the Waste Heat Recovery of ICE
title_full_unstemmed	Performances of Transcritical Power Cycles with CO<sub>2</sub>-Based Mixtures for the Waste Heat Recovery of ICE
title_sort	performances of transcritical power cycles with co<sub>2</sub>-based mixtures for the waste heat recovery of ice
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/aeff01f8a4ad47a897511a61a7681d29
work_keys_str_mv	AT jinghangliu performancesoftranscriticalpowercycleswithcosub2subbasedmixturesforthewasteheatrecoveryofice AT aofangyu performancesoftranscriticalpowercycleswithcosub2subbasedmixturesforthewasteheatrecoveryofice AT xinxinglin performancesoftranscriticalpowercycleswithcosub2subbasedmixturesforthewasteheatrecoveryofice AT wensu performancesoftranscriticalpowercycleswithcosub2subbasedmixturesforthewasteheatrecoveryofice AT shaoduanou performancesoftranscriticalpowercycleswithcosub2subbasedmixturesforthewasteheatrecoveryofice
_version_	1718412245824700416

Performances of Transcritical Power Cycles with CO<sub>2</sub>-Based Mixtures for the Waste Heat Recovery of ICE

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