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Study on the performance of a forced convection low temperature radiator for district heating
Dalian University of Technology, China; Aalto University, Finland.
Dalian University of Technology, China.
Dalian University of Technology, China.
Dalian University of Technology, China.
Vise andre og tillknytning
2023 (engelsk)Inngår i: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 283, artikkel-id 129036Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Low temperature district heating has significant advantages in energy efficiency, but a huge amount of existing radiators lack the capabilities for low-temperate heating. The innovation of this study is to develop an optimal and techno-economic method to improve the heating power of existing radiator by mounting a small fan considering different hydraulic connection modes. An experimental test rig was designed to study the optimal installation positions and angles of the fan. For a dormitory room in China, a computational fluid dynamics (CFD) model was developed and verified. The model was used to determine the lowest supply temperature of the radiator. Results show that the fan should be placed in a position and angle that blows air over the hottest surface of the radiator i.e. the hot center. The lowest supply temperatures before and after installing the fan are 42.3 °C and 39.5 °C. The response speed is increased by 28%, stability time is shortened by 13%, while the maximum indoor temperature difference is reduced by 15% and the maximum indoor air velocity is reduced by 0.07 m/s. Payback time is 63 days for case study, indicating a good economic feasibility. The method is beneficial to both the heat plant and users. 

sted, utgiver, år, opplag, sider
Elsevier Ltd , 2023. Vol. 283, artikkel-id 129036
Emneord [en]
Air; Computational fluid dynamics; District heating; Economic analysis; Energy efficiency; Radiators; Temperature; Heating power; Hydraulic connection; Low temperature radiator; Lows-temperatures; Performance; Renewable energies; Small fans; Supply temperatures; Supply water temperature; Techno-economic methods; Forced convection
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Identifikatorer
URN: urn:nbn:se:ri:diva-67361DOI: 10.1016/j.energy.2023.129036Scopus ID: 2-s2.0-85170694572OAI: oai:DiVA.org:ri-67361DiVA, id: diva2:1799409
Merknad

This work was supported by the China national key research and development program – China-Finland intergovernmental cooperation in science and technology innovation (2021YFE0116200), academy research fellow funding from Academy of Finland (336268 and 334205), and also supported by the Fundamental Research Funds for the Central Universities of China (DUT21JC32).

Tilgjengelig fra: 2023-09-22 Laget: 2023-09-22 Sist oppdatert: 2024-04-04bibliografisk kontrollert

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Abdollahi, Elnaz

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