High temperature transcritical CO2 heat pump with optimized tube-in-tube heat exchanger

被引:8
作者
Ge, T. S. [1 ]
Weng, Z. C. [1 ]
Huang, R. [1 ]
Hu, B. [1 ]
Eikevik, Trygve Magne [2 ]
Dai, Y. J. [1 ]
机构
[1] Shanghai Jiao Tong Univ, Inst Refrigerat & Cryogen, Shanghai 200240, Peoples R China
[2] NTNU, Dept Energy & Proc Engn, Kolbjorn Hejes vei 1B, N-7491 Trondheim, Norway
关键词
TranscriticalCO2 heat pump; High temperature; Gas cooler; Simulation; Experimental testing; SUPERCRITICAL CARBON-DIOXIDE; PERFORMANCE; SYSTEM;
D O I
10.1016/j.energy.2023.129223
中图分类号
O414.1 [热力学];
学科分类号
摘要
CO2 heat pump operating on tanscritical cycle is widely adopted to provide hot water whose temperature is as high as about 90 degrees C. Recently, it is recognized that high temperature heat pump has promising application in various industries such as papermaking, chemical, automotive, and metallurgical. Then, in this paper a model of a tube-in-tube heat exchanger was established, and its parameters including tube length, fin height, fin number, fin thickness and helix angle are optimized through simulation to enhance its heat transfer performance, Accordingly, a transcritical CO2 heat pump system which can provide about 100 degrees C pressurized hot water is proposed and investigated. Subsequently, an experimental setup is constructed and operated under ambient temperatures, inlet and outlet temperatures of cooling water to demonstrate the feasibility of obtaining hot water at 100 degrees C. When the ambient temperature and inlet water temperatures are 40 degrees C and 9 degrees C respectively, the highest COP of 3.64 is obtained in experiments and the corresponding simulated value is 3.87. When the ambient temperature is 40 degrees C, inlet and outlet water temperatures are 9 degrees C and 85 degrees C, respectively, the study recorded the highest COP of 4.47. It is worth noting that both the heating capacity and COP increase with rising ambient temperature.
引用
收藏
页数:12
相关论文
共 29 条
[1]   Optimization of two-stage transcritical carbon dioxide heat pump cycles [J].
Agrawal, Neeraj ;
Bhattacharyya, Souvik ;
Sarkar, J. .
INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 2007, 46 (02) :180-187
[2]   High temperature heat pumps: Market overview, state of the art, research status, refrigerants, and application potentials [J].
Arpagaus, Cordin ;
Bless, Frederic ;
Uhlmann, Michael ;
Schiffmann, Jurg ;
Bertsch, Stefan S. .
ENERGY, 2018, 152 :985-1010
[3]   Performance characteristics of a two-stage CO2 heat pump water heater adopting a sub-cooler vapor injection cycle at various operating conditions [J].
Baek, Changhyun ;
Heo, Jaehyeok ;
Jung, Jongho ;
Cho, Honghyun ;
Kim, Yongchan .
ENERGY, 2014, 77 :570-578
[4]   Review on development of air source transcritical CO2 heat pump systems using direct-heated type and recirculating-heated type [J].
Cao, Feng ;
Song, Yulong ;
Li, Mingjia .
INTERNATIONAL JOURNAL OF REFRIGERATION, 2019, 104 :455-475
[5]  
Carnavos T.C., 1980, HEAT TRANSFER ENG, V1, P32, DOI DOI 10.1080/01457638008939566
[6]   In-tube cooling heat transfer of supercritical carbon dioxide. Part 1. Experimental measurement [J].
Dang, C ;
Hihara, E .
INTERNATIONAL JOURNAL OF REFRIGERATION, 2004, 27 (07) :736-747
[7]   In-tube cooling heat transfer of supercritical carbon dioxide. Part 2. Comparison of numerical calculation with different turbulence models [J].
Dang, CB ;
Hihara, E .
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 2004, 27 (07) :748-760
[8]  
Heli, The history of carbon dioxide as a refrigerant
[9]   Extremum seeking control of COP optimization for air-source transcritical CO2 heat pump water heater system [J].
Hu, Bin ;
Li, Yaoyu ;
Cao, Feng ;
Xing, Ziwen .
APPLIED ENERGY, 2015, 147 :361-372
[10]  
Huanqiu, Why does China mention emissions of this gas in a solemn pledge today?