Low-temperature heating in existing Swedish multifamily houses: an assessment of the significance of radiator design and geometry
(English)Manuscript (preprint) (Other academic)
This study evaluated the impacts of radiator designs and geometries. The aim was to map the thermal efficiency and performance differences of studied radiator types. A typical Swedish low-rise multifamily house was selected to present the analysis. Swedish climate was employed to evaluate the applicability. On-site measurements, analytical model and real-life performance data from radiator manufactures were applied for the modeling work.
It was found that radiator Type 21 1.2m x 0.4m shows the highest exergy efficiency. Type 11 1.2m x 0.45m shows the lowest exergy efficiency. There is no evidence found that Type 22 (adding more convector plate) has higher thermal efficiency than Type 21, from an engineering perspective, under the climate range of -20 to 15 . Baseboard radiator showed 34 % higher exergy performance than the most efficient conventional radiator, with the same surface area, at mean outdoor temperature during an average heating season in Sweden (-1.3 ). The results also suggest that Type 21 would have higher efficiency compared to Type 11 during 50 % time of the heating season, in severe climate conditions. In the climate of Stockholm, this was 20 %. For the mild climate, Type 11 and Type 21 perform almost the same during the whole heating season.
Radiator, design and geometry, low temperature heating, thermal efficiency, existing Swedish multifamily house
Research subject Energy Technology
IdentifiersURN: urn:nbn:se:kth:diva-193103OAI: oai:DiVA.org:kth-193103DiVA: diva2:975164
In press, special issue of CCHVAC 20152016-09-282016-09-282016-09-29Bibliographically approved