机械过冷跨临界CO2热泵供暖系统性能分析
TB657.5%TK172; 采用辅助的蒸气压缩循环进行过冷,可改善传统跨临界CO2热泵系统用于冬季供暖性能.本文通过构建机械过冷跨临界CO2热泵系统的热力模型,分析了机械过冷跨临界CO2热泵系统供暖工况下的运行特性,结果表明:机械过冷CO2热泵系统存在最大COP,对应最优排气压力和过冷度,标准工况下比常规CO2系统能效提高15.9%.该系统可有效解决常规CO2热泵回水温度过高导致COP迅速衰减的问题,当回水温度由40℃升至50℃时,常规系统COP下降16.9%,而机械过冷热泵系统COP仅下降8.4%.通过改进可有效降低CO2压缩机的排气压力和温度,且供水温度越低排气压力降低效果越显著.机械过...
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Published in | 制冷学报 Vol. 40; no. 4; pp. 29 - 36 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | Chinese |
Published |
天津商业大学 天津市制冷技术重点实验室 天津 300134%冰轮环境技术股份有限公司 烟台 264000%天津大学热能研究所 天津 300072
01.08.2019
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Subjects | |
Online Access | Get full text |
ISSN | 0253-4339 |
DOI | 10.3969/j.issn.0253-4339.2019.04.029 |
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Abstract | TB657.5%TK172; 采用辅助的蒸气压缩循环进行过冷,可改善传统跨临界CO2热泵系统用于冬季供暖性能.本文通过构建机械过冷跨临界CO2热泵系统的热力模型,分析了机械过冷跨临界CO2热泵系统供暖工况下的运行特性,结果表明:机械过冷CO2热泵系统存在最大COP,对应最优排气压力和过冷度,标准工况下比常规CO2系统能效提高15.9%.该系统可有效解决常规CO2热泵回水温度过高导致COP迅速衰减的问题,当回水温度由40℃升至50℃时,常规系统COP下降16.9%,而机械过冷热泵系统COP仅下降8.4%.通过改进可有效降低CO2压缩机的排气压力和温度,且供水温度越低排气压力降低效果越显著.机械过冷循环工质的选取会影响系统整体性能,选取的11种过冷循环工质中能效最高的为R717,最低的为R1234yf.在低环境温度工况下性能的提升更加明显,通过配置小型常规工质蒸气压缩循环即可实现CO2热泵系统性能显著改进,经济性优势明显. |
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AbstractList | TB657.5%TK172; 采用辅助的蒸气压缩循环进行过冷,可改善传统跨临界CO2热泵系统用于冬季供暖性能.本文通过构建机械过冷跨临界CO2热泵系统的热力模型,分析了机械过冷跨临界CO2热泵系统供暖工况下的运行特性,结果表明:机械过冷CO2热泵系统存在最大COP,对应最优排气压力和过冷度,标准工况下比常规CO2系统能效提高15.9%.该系统可有效解决常规CO2热泵回水温度过高导致COP迅速衰减的问题,当回水温度由40℃升至50℃时,常规系统COP下降16.9%,而机械过冷热泵系统COP仅下降8.4%.通过改进可有效降低CO2压缩机的排气压力和温度,且供水温度越低排气压力降低效果越显著.机械过冷循环工质的选取会影响系统整体性能,选取的11种过冷循环工质中能效最高的为R717,最低的为R1234yf.在低环境温度工况下性能的提升更加明显,通过配置小型常规工质蒸气压缩循环即可实现CO2热泵系统性能显著改进,经济性优势明显. |
Author | 代宝民 刘圣春 剧成成 孙志利 齐海峰 马一太 粱梦桃 |
AuthorAffiliation | 天津商业大学 天津市制冷技术重点实验室 天津 300134%冰轮环境技术股份有限公司 烟台 264000%天津大学热能研究所 天津 300072 |
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Author_FL | Liang Mengtao Ju Chengcheng Qi Haifeng Sun Zhili Ma Yitai Liu Shengchun Dai Baomin |
Author_FL_xml | – sequence: 1 fullname: Dai Baomin – sequence: 2 fullname: Ju Chengcheng – sequence: 3 fullname: Liang Mengtao – sequence: 4 fullname: Liu Shengchun – sequence: 5 fullname: Sun Zhili – sequence: 6 fullname: Qi Haifeng – sequence: 7 fullname: Ma Yitai |
Author_xml | – sequence: 1 fullname: 代宝民 – sequence: 2 fullname: 剧成成 – sequence: 3 fullname: 粱梦桃 – sequence: 4 fullname: 刘圣春 – sequence: 5 fullname: 孙志利 – sequence: 6 fullname: 齐海峰 – sequence: 7 fullname: 马一太 |
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DocumentTitle_FL | Performance Analysis of a Transcritical CO2 Heat Pump with Mechanical Subcooling for Space Heating |
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Title | 机械过冷跨临界CO2热泵供暖系统性能分析 |
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