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Transient numerical model for a coaxial borehole heat exchanger with the effect of borehole heat capacity
Author(s) -
Yang Xinyu,
Wang Guodong,
Wang Qingsheng,
Chen Changqi
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4457
Subject(s) - borehole , heat exchanger , coaxial , transient (computer programming) , mechanics , thermal , transient response , materials science , geotechnical engineering , geology , thermodynamics , engineering , mechanical engineering , physics , electrical engineering , computer science , operating system
Summary This paper proposed a transient numerical model for a coaxial borehole heat exchanger, which considered the impact of borehole specific heat capacity. The fluid vertical temperature distribution inside the coaxial borehole heat exchanger (BHE) had been predicted based on MATLAB and compared with other transient models. Validated by measured data from a thermal response test, the built model agreed better than other models, especially in short times, with a relative error of 3.63% in 2 hours. Then, the quantitative influences of borehole specific heat capacity and other parameters on thermal performance of borehole heat exchangers were specified.