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Carnot battery (CB) is an energy storage technology with the advantages of high energy storage density and low investment cost. The single-stage heat pump of basic Carnot battery have a low coefficient of performance (COP) under high energy storage density conditions, resulting in a phenomenon of high quality but low utilization of heat. In order to solve this problem, a CB using cascaded heat pump (CHP) and supercritical organic Rankine cycle (ORC) is proposed. Through modeling and analysis, the optimal combination of CHP-CB working fluids is obtained, and the effects of waste heat source temperature, high and low temperature heat storage tank temperature, CHP intermediate temperature on system COP, energy conversion efficiency, energy storage density (ED) and system exergy loss are discussed. The results show that under high energy density conditions, the COP of the CHP-CB is about 23.5% and 26.9% higher than that of the basic CB when the temperature of the low-temperature storage tank is 50 ℃ and 32 ℃, respeetively. When the temperature of the low-temperature storage tank is 30 ℃, the energy conversion efficiency of the CHP-CB can reach 63.11%. The ED can reach 13.9 kW·h/m3 when the temperature difference between the high- and low-temperature storage tank is 93 ℃, and cascade heating for the heat storage working fluid can be realized.
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卡诺电池(CB)具有储能密度高、投资成本低的优点。基本有机朗肯循环CB(B-CB)的单级热泵(HP)在高储能密度情况下热泵系数(COP)较低,存在热量的高质低用现象,为解决这一问题,提出了一种采用级联热泵(CHP)、超临界有机朗肯循环的CB,通过建模分析,得到了CHP-CB的最佳工质组合,探讨了余热源温度、高低温储热罐温度、CHP中间温度对系统COP、能量转换效率(PTP)、储能密度(ED)的影响以及系统的㶲损。在高储能密度条件下,低温储罐温度分别为50、32 ℃时CHP-CB较基本CB,热泵系数分别提高约23.5%和26.9%,低温储罐温度为30 ℃时能量转换效率可达63.11%。在高低温储罐温度相差93 ℃时系统ED可达13.9 kW·h/m3,且能够对储热工质进行梯级加热。
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2016(4): 41-44., articleTitle=Turbine mass flow optimization in helium liquefiers and thermodynamic analysis of factors for affecting optimal turbine mass flow, refAbstract=null)], funds=[Fund(id=1217836128950993183, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, awardId=52206010, language=EN, fundingSource=National Natural Science Foundation of China(52206010), fundOrder=null, country=null), Fund(id=1217836129001324834, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, awardId=52206010, language=CN, fundingSource=国家自然科学基金项目(52206010), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1217836119933240215, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, xref=null, ext=[AuthorCompanyExt(id=1217836119941628824, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, companyId=1217836119933240215, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Hebei Key Laboratory of Energy Storage and Integrated Energy Systems, North China Electric Power University, Baoding 071003, China), AuthorCompanyExt(id=1217836119950017435, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, companyId=1217836119933240215, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=河北省储能与综合能源系统重点实验室,华北电力大学,河北 保定 071003)])], figs=[ArticleFig(id=1217836123389345857, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.1, caption=
Basic Carnot battery system, figureFileSmall=kWVycExm0NiIdXBNo3Rr2Q==, figureFileBig=i0SOfH0MuhBiinnNINRC9g==, tableContent=null), ArticleFig(id=1217836123460649028, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图1, caption=
基本卡诺电池系统, figureFileSmall=kWVycExm0NiIdXBNo3Rr2Q==, figureFileBig=i0SOfH0MuhBiinnNINRC9g==, tableContent=null), ArticleFig(id=1217836123603255378, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.2, caption=
The Ccarnot battery system with cascade heat pumps, figureFileSmall=djT4k4V38zbM0jeYkJOJtA==, figureFileBig=FdaOVB0a3MZNBpHBzG9sQw==, tableContent=null), ArticleFig(id=1217836123787804761, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图2, caption=
级联热泵卡诺电池系统, figureFileSmall=djT4k4V38zbM0jeYkJOJtA==, figureFileBig=FdaOVB0a3MZNBpHBzG9sQw==, tableContent=null), ArticleFig(id=1217836123863302240, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.3, caption=
Schematic diagram of the heat pump improvement, figureFileSmall=wusiF0ObAIXyniKUwAVhQQ==, figureFileBig=sxWggzmNrQbLGuWBglbZqQ==, tableContent=null), ArticleFig(id=1217836123955576935, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图3, caption=
热泵改进示意, figureFileSmall=wusiF0ObAIXyniKUwAVhQQ==, figureFileBig=sxWggzmNrQbLGuWBglbZqQ==, tableContent=null), ArticleFig(id=1217836124022685805, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.4, caption=
Schematic diagram of the ORC and SORC improvement, figureFileSmall=4WCIXomXr7VpbVs4y8Rh8g==, figureFileBig=/2YNgNFbYj8xEP859NQDuQ==, tableContent=null), ArticleFig(id=1217836124093988976, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图4, caption=
ORC与SORC改进示意, figureFileSmall=4WCIXomXr7VpbVs4y8Rh8g==, figureFileBig=/2YNgNFbYj8xEP859NQDuQ==, tableContent=null), ArticleFig(id=1217836124194652280, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.5, caption=
Changes of COP of the CHP and HP with temperature of low-temperature storage tank, figureFileSmall=p4yYQRqoRLOwe+GA08quiA==, figureFileBig=FBYV7gArpPu12lrSxl+cQA==, tableContent=null), ArticleFig(id=1217836124278538364, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图5, caption=
级联热泵与单级热泵的COP随低温储罐温度变化对比, figureFileSmall=p4yYQRqoRLOwe+GA08quiA==, figureFileBig=FBYV7gArpPu12lrSxl+cQA==, tableContent=null), ArticleFig(id=1217836124366618754, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.6, caption=
Changes of COP of the CHP and HP with charging power, figureFileSmall=CRGr+BOVDtofxaN0msiXxQ==, figureFileBig=Pvp+AVBhSSrswrg8apUrRQ==, tableContent=null), ArticleFig(id=1217836124450504838, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图6, caption=
CHP与HP的COP随充电功率变化对比, figureFileSmall=CRGr+BOVDtofxaN0msiXxQ==, figureFileBig=Pvp+AVBhSSrswrg8apUrRQ==, tableContent=null), ArticleFig(id=1217836124538585228, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.7, caption=
PTP capacity of the system working fluids, figureFileSmall=LF1wu6A7kkiDW58TEuAHmA==, figureFileBig=8NEW0Z+ikYiMSsrWg4lH0g==, tableContent=null), ArticleFig(id=1217836124643442833, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图7, caption=
系统工质PTP能力对比, figureFileSmall=LF1wu6A7kkiDW58TEuAHmA==, figureFileBig=8NEW0Z+ikYiMSsrWg4lH0g==, tableContent=null), ArticleFig(id=1217836124731523224, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.8, caption=
Effect of waste heat source temperature on the system, figureFileSmall=misuf28iw1HRvKC0xLCj8Q==, figureFileBig=0Ti0Q0ORjDZO9S/hmxWQiw==, tableContent=null), ArticleFig(id=1217836124823797916, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图8, caption=
余热源温度变化对系统影响, figureFileSmall=misuf28iw1HRvKC0xLCj8Q==, figureFileBig=0Ti0Q0ORjDZO9S/hmxWQiw==, tableContent=null), ArticleFig(id=1217836124916072610, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.9, caption=
Effect of temperature of high-temperature storage tank on the system, figureFileSmall=rXkmhxf3vLHS9CdIc6PWJQ==, figureFileBig=7xKVTY0UkIcvgVFpAaRf0w==, tableContent=null), ArticleFig(id=1217836126241472679, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图9, caption=
高温储罐温度对系统影响, figureFileSmall=rXkmhxf3vLHS9CdIc6PWJQ==, figureFileBig=7xKVTY0UkIcvgVFpAaRf0w==, tableContent=null), ArticleFig(id=1217836126363107502, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.10, caption=
Effect of temperature of low-temperature storage tank on the system, figureFileSmall=p4WfKMnsM+LerF/2qrQ3/Q==, figureFileBig=8wWo/Hr6cNZvQfmx2VvdJQ==, tableContent=null), ArticleFig(id=1217836126467965108, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图10, caption=
低温储罐温度对系统影响, figureFileSmall=p4WfKMnsM+LerF/2qrQ3/Q==, figureFileBig=8wWo/Hr6cNZvQfmx2VvdJQ==, tableContent=null), ArticleFig(id=1217836126581211321, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.11, caption=
Effect of mid-temperature of the heat pump, figureFileSmall=NlFEXByUas0sGAfwu5wH5g==, figureFileBig=9UmjE3kAoi0RdXc4PHgGhg==, tableContent=null), ArticleFig(id=1217836126673486015, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图11, caption=
热泵中间温度影响, figureFileSmall=NlFEXByUas0sGAfwu5wH5g==, figureFileBig=9UmjE3kAoi0RdXc4PHgGhg==, tableContent=null), ArticleFig(id=1217836126748983490, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.12, caption=
Effect of mid-temperature change on the system, figureFileSmall=+EDd7gr0tTalY2M1tTiqeA==, figureFileBig=Z/djolz/PEep1Z9qP6dlkQ==, tableContent=null), ArticleFig(id=1217836126874812613, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图12, caption=
中间温度变化对系统影响, figureFileSmall=+EDd7gr0tTalY2M1tTiqeA==, figureFileBig=Z/djolz/PEep1Z9qP6dlkQ==, tableContent=null), ArticleFig(id=1217836127071944907, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.13, caption=
Exergy losses at pump side of the system, figureFileSmall=SAk7hYOhWQk4O7i9EIZiWg==, figureFileBig=XH/Ej/BC7aN01z+sFDdZUg==, tableContent=null), ArticleFig(id=1217836127185191118, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图13, caption=
系统热泵侧㶲损, figureFileSmall=SAk7hYOhWQk4O7i9EIZiWg==, figureFileBig=XH/Ej/BC7aN01z+sFDdZUg==, tableContent=null), ArticleFig(id=1217836127302631633, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Fig.14, caption=
Exergy losses at turbine side of the system, figureFileSmall=HmRody3n4TNsWVT9Ky2IsA==, figureFileBig=PFZ3NMG0nKsp2zNd3bm4cw==, tableContent=null), ArticleFig(id=1217836127415877845, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=图14, caption=
系统热机侧㶲损, figureFileSmall=HmRody3n4TNsWVT9Ky2IsA==, figureFileBig=PFZ3NMG0nKsp2zNd3bm4cw==, tableContent=null), ArticleFig(id=1217836127516541147, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Tab.1, caption=
Equations for exergy loss
, figureFileSmall=null, figureFileBig=null, tableContent=
| 器件 | 公式 | 图例 |
|---|
| 透平 | |  |
| 泵 | |  |
| 凝汽器 | |  |
| 压缩机 | |  |
| 节流阀 | |  |
| 蒸发器 | |  |
), ArticleFig(id=1217836127617204447, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=表1, caption=
㶲损方程
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| 器件 | 公式 | 图例 |
|---|
| 透平 | |  |
| 泵 | |  |
| 凝汽器 | |  |
| 压缩机 | |  |
| 节流阀 | |  |
| 蒸发器 | |  |
), ArticleFig(id=1217836127680119012, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Tab.2, caption=
Basic parameters
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| 项目 | 数值 |
|---|
| 储热工质 | 水 |
| 环境压力/kPa | 101.325 |
| 压缩机等熵效率 | 0.85 |
| 透平等熵效率 | 0.85 |
| 储热罐效率 | 0.95 |
| 泵效率 | 0.80 |
| 余热源流量/(kg·s–1) | 10 |
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基本参数
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| 项目 | 数值 |
|---|
| 储热工质 | 水 |
| 环境压力/kPa | 101.325 |
| 压缩机等熵效率 | 0.85 |
| 透平等熵效率 | 0.85 |
| 储热罐效率 | 0.95 |
| 泵效率 | 0.80 |
| 余热源流量/(kg·s–1) | 10 |
), ArticleFig(id=1217836127860474091, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Tab.3, caption=
Equations for conservation of energy
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| 器件 | 公式 | 隶属循环 |
|---|
| 蒸发器1 | | 一级热泵 |
| 蒸发器2 | | 二级热泵 |
| 凝汽器1 | | 一级热泵 |
| 凝汽器2 | | 二级热泵 |
| 压缩机1 | | 一级热泵 |
| 压缩机2 | | 二级热泵 |
| 阀1 | | 一级热泵 |
| 阀2 | | 二级热泵 |
| 蒸发器3 | | 热机 |
| 透平 | | 热机 |
| 凝汽器3 | | 热机 |
| 泵 | | 热机 |
), ArticleFig(id=1217836127982108914, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=表3, caption=
能量守恒方程
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| 器件 | 公式 | 隶属循环 |
|---|
| 蒸发器1 | | 一级热泵 |
| 蒸发器2 | | 二级热泵 |
| 凝汽器1 | | 一级热泵 |
| 凝汽器2 | | 二级热泵 |
| 压缩机1 | | 一级热泵 |
| 压缩机2 | | 二级热泵 |
| 阀1 | | 一级热泵 |
| 阀2 | | 二级热泵 |
| 蒸发器3 | | 热机 |
| 透平 | | 热机 |
| 凝汽器3 | | 热机 |
| 泵 | | 热机 |
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Operation parameters of the working fluid
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| 项目 | 数值 |
|---|
| THST | 123 |
| TLST | 30 |
| 余热源温度Twh | 85 |
| 凝汽器1入口温度 | 128 |
| 凝汽器1出口温度 | 40 |
| 凝汽器2出口温度 | 15 |
| 凝汽器3出口温度 | 25 |
| 蒸发器3出口温度 | 118 |
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工质运行参数
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| 项目 | 数值 |
|---|
| THST | 123 |
| TLST | 30 |
| 余热源温度Twh | 85 |
| 凝汽器1入口温度 | 128 |
| 凝汽器1出口温度 | 40 |
| 凝汽器2出口温度 | 15 |
| 凝汽器3出口温度 | 25 |
| 蒸发器3出口温度 | 118 |
), ArticleFig(id=1217836128347013381, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Tab.5, caption=
Operation parameters for waste heat source temperature changes
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| 项目 | 数值 |
|---|
| THST/℃ | 123 |
| 储热罐工质流量mST/(kg·s–1) | 8.72 |
| 凝汽器1入口温度/℃ | 128 |
| 凝汽器1出口温度/℃ | 40 |
| 凝汽器2出口温度/℃ | 15 |
| 凝汽器3出口温度/℃ | 25 |
| 蒸发器3出口温度/℃ | 118 |
), ArticleFig(id=1217836128430899464, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=表5, caption=
余热源温度变化运行参数
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| 项目 | 数值 |
|---|
| THST/℃ | 123 |
| 储热罐工质流量mST/(kg·s–1) | 8.72 |
| 凝汽器1入口温度/℃ | 128 |
| 凝汽器1出口温度/℃ | 40 |
| 凝汽器2出口温度/℃ | 15 |
| 凝汽器3出口温度/℃ | 25 |
| 蒸发器3出口温度/℃ | 118 |
), ArticleFig(id=1217836128531562765, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Tab.6, caption=
Operation parameters of the storage tank
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| 项目 | 数值 |
|---|
| Twh | 85 |
| 凝汽器1出口温度 | 40 |
| 凝汽器2出口温度 | 15 |
| 凝汽器3出口温度 | 25 |
| 蒸发器3出口温度 | 118 |
), ArticleFig(id=1217836128644808980, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=CN, label=表6, caption=
储热罐运行参数
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| 项目 | 数值 |
|---|
| Twh | 85 |
| 凝汽器1出口温度 | 40 |
| 凝汽器2出口温度 | 15 |
| 凝汽器3出口温度 | 25 |
| 蒸发器3出口温度 | 118 |
), ArticleFig(id=1217836128753860888, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836114711331544, language=EN, label=Tab.7, caption=
Parameters for exergy loss
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| 项目 | 数值 |
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| THST | 123 |
| TLST | 40 |
| Twh | 85 |
| 凝汽器1入口温度 | 128 |
| 凝汽器1出口温度 | 40 |
| 凝汽器2出口温度 | 15 |
| 凝汽器3出口温度 | 25 |
| 蒸发器3出口温度 | 118 |
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㶲损运行参数
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| 项目 | 数值 |
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| THST | 123 |
| TLST | 40 |
| Twh | 85 |
| 凝汽器1入口温度 | 128 |
| 凝汽器1出口温度 | 40 |
| 凝汽器2出口温度 | 15 |
| 凝汽器3出口温度 | 25 |
| 蒸发器3出口温度 | 118 |
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