LAPSE:2019.1132
Published Article
LAPSE:2019.1132
Experimental and Numerical Study of Double-Pipe Evaporators Designed for CO2 Transcritical Systems
Junlan Yang, Shuying Ning
November 5, 2019
The performance of a CO2 double-pipe evaporator was studied through experiments and a simulation model that was established by the steady-state distribution parameter method and experimentally verified while using a CO2 transcritical water‒water heat pump system. The effects of different operating parameters on heat transfer performance were studied over a range of evaporation temperatures (−5 to 5 °C), mass velocity (100‒600 kg/m2s), and heat flux (5000‒15,000 W/m2). It was found that the dryout quality increased at a small evaporation temperature, a large mass velocity, and a small heat flux. The simulation yield means relative error (RE) of heat transfer for the evaporation temperature and that of the CO2 pressure drop for the chilled water inlet temperature were 5.21% and 3.78%, respectively. The effect of tube diameter on the performance of CO2 double-pipe evaporator is probed through simulations. At the same time, this paper defines a parameter α , which is the proportion of the pre-dryout region to the whole heat transfer region. A larger α value is desirable. A further theoretical basis is provided for designing an efficient and compact CO2 evaporator.
Keywords
Carbon Dioxide, double-pipe evaporator, experimental study, heat transfer, Simulation
Suggested Citation
Yang J, Ning S. Experimental and Numerical Study of Double-Pipe Evaporators Designed for CO2 Transcritical Systems. (2019). LAPSE:2019.1132
Author Affiliations
Yang J: School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, China
Ning S: School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, China [ORCID]
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Journal Name
Processes
Volume
7
Issue
8
Article Number
E547
Year
2019
Publication Date
2019-08-19
Published Version
ISSN
2227-9717
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PII: pr7080547, Publication Type: Journal Article
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LAPSE:2019.1132
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doi:10.3390/pr7080547
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Nov 5, 2019
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Nov 5, 2019
 
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Calvin Tsay
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