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Performance evaluation of radiant baseboards (skirtings) for room heating - An analytical and experimental approach
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Fluid and Climate Technology.ORCID iD: 0000-0001-5902-2886
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Fluid and Climate Technology.ORCID iD: 0000-0003-1882-3833
2014 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 62, no 2, 382-389 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to investigate the thermal performance of the hydronic radiant baseboards currently used for space heating in built environments. The presently available equations for determination of heat outputs from these room heaters are valid for a certain height at a specific temperature range. This limitation needed to be addressed as radiant baseboards may be both energy and cost efficient option for space heating in the future. The main goal of this study was therefore to design an equation valid for all baseboard heights (100-200 mm) and excess temperatures (9-60 C) usually used in built environments. The proposed equation was created by curve fitting using the standard method of least squares together with data from previous laboratory measurements. It was shown that the predictions by the proposed equation were in close agreement with reported experimental data. Besides, it was also revealed that the mean heat transfer coefficient of the investigated radiant baseboards was about 50% higher than the mean heat transfer coefficient of five conventional panel radiators of different types. The proposed equation can easily be used or programed in energy simulation codes. Hopefully this will help engineers to quantify more accurately the energy consumption for space heating in buildings served by radiant baseboards.

Place, publisher, year, edition, pages
2014. Vol. 62, no 2, 382-389 p.
Keyword [en]
Baseboard (skirting) heating, Radiator heating, Space heating, Energy efficiency, Measurements, Curve fitting
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-133220DOI: 10.1016/j.applthermaleng.2013.09.053ISI: 000330910700009Scopus ID: 2-s2.0-84886681164OAI: oai:DiVA.org:kth-133220DiVA: diva2:660234
Funder
Swedish Energy Agency
Note

QC 20131029

Available from: 2013-10-29 Created: 2013-10-29 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Technical solutions for low-temperature heat emission in buildings
Open this publication in new window or tab >>Technical solutions for low-temperature heat emission in buildings
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The European Union is planning to greatly decrease energy consumption during the coming decades. The ultimate goal is to create sustainable communities that are energy neutral. One way of achieving this challenging goal may be to use efficient hydronic (water-based) heating systems supported by heat pumps.

The main objective of the research reported in this work was to improve the thermal performance of wall-mounted hydronic space heaters (radiators). By improving the thermal efficiency of the radiators, their operating temperatures can be lowered without decreasing their thermal outputs. This would significantly improve efficiency of the heat pumps, and thereby most probably also reduce the emissions of greenhouse gases. Thus, by improving the efficiency of radiators, energy sustainability of our society would also increase. The objective was also to investigate how much the temperature of the supply water to the radiators could be lowered without decreasing human thermal comfort.

Both numerical and analytical modeling was used to map and improve the thermal efficiency of the analyzed radiator system. Analyses have shown that it is possible to cover space heat losses at low outdoor temperatures with the proposed heating-ventilation systems using low-temperature supplies. The proposed systems were able to give the same heat output as conventional radiator systems but at considerably lower supply water temperature. Accordingly, the heat pump efficiency in the proposed systems was in the same proportion higher than in conventional radiator systems.

The human thermal comfort could also be maintained at acceptable level at low-temperature supplies with the proposed systems. In order to avoid possible draught discomfort in spaces served by these systems, it was suggested to direct the pre-heated ventilation air towards cold glazed areas. By doing so the draught discomfort could be efficiently neutralized.    

Results presented in this work clearly highlight the advantage of forced convection and high temperature gradients inside and alongside radiators - especially for low-temperature supplies. Thus by a proper combination of incoming air supply and existing radiators a significant decrease in supply water temperature could be achieved without decreasing the thermal output from the system. This was confirmed in several studies in this work. It was also shown that existing radiator systems could successfully be combined with efficient air heaters. This also allowed a considerable reduction in supply water temperature without lowering the heat output of the systems. Thus, by employing the proposed methods, a significant improvement of thermal efficiency of existing radiator systems could be accomplished. A wider use of such combined systems in our society would reduce the distribution heat losses from district heating networks, improve heat pump efficiency and thereby most probably also lower carbon dioxide emissions.  

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. 34 p.
Keyword
Analytical and numerical modeling, baseboard (skirting) heating, building energy performance, computational fluid dynamics (CFD), heat transfer, low-temperature heating, space heating, thermal comfort
National Category
Energy Engineering
Research subject
Järnvägsgruppen - Effektiva tågsystem för godstrafik
Identifiers
urn:nbn:se:kth:diva-133221 (URN)978-91-7501-940-6 (ISBN)
Public defence
2013-11-15, Sal: Q2, Osquldasväg 10, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Energy Agency
Note

QC 20131029

Available from: 2013-10-29 Created: 2013-10-29 Last updated: 2013-11-19Bibliographically approved

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Ploskić, AdnanHolmberg, Sture

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