期刊
JOURNAL OF BUILDING PERFORMANCE SIMULATION
卷 8, 期 5, 页码 312-325出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/19401493.2014.938121
关键词
convective heat transfer coefficient; cooling; radiant wall; active chilled beam; air jet trajectory; Archimedes number
资金
- Danish Agency for Science, Technology and Innovation
- Ministry of Science and Technology of P.R. China (Danish International DSF) [09-71598, 2010DFA62410]
The complexity and diversity of airflow in buildings make the accurate definition of convective heat transfer coefficients (CHTCs) difficult. In a full-scale test facility, the convective heat transfer of two cooling systems (active chilled beam and radiant wall) has been investigated under steady-state and dynamic conditions. With the air-based cooling system, a dependency of the convective heat transfer on the air jet trajectory has been observed. New correlations have been developed, introducing a modified Archimedes number to account for the air flow pattern. The accuracy of the new correlations has been evaluated to +/- 15%. Besides the study with an air-based cooling system, the convective heat transfer with a radiant cooling system has also been investigated. The convective flow at the activated surface is mainly driven by natural convection. For other surfaces, the complexity of the flow and the large uncertainty on the CHTCs make the validation of existing correlations difficult.
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