Low-temperature ventilation pre-heater in combination with conventional room heaters
2013 (English)In: Energy and Buildings, ISSN 0378-7788, Vol. 65, 248-259 p.Article in journal (Refereed) Published
The main focus of the present study was to find design requirements for an air-heater that would be able to operate at low pressure loss and low-temperature water supply. The idea was to combine this low-temperature air-heater with existing radiator systems so that they can operate at similar low-temperature supply as used in floor heating systems. Results indicated that the proposed air-heater was able to lift the temperature of supply air at 10 l/s from -15 degrees C to 18.7 degrees C using 40 degrees C water supply. In addition, a thermal performance analysis showed that radiator systems equipped with the proposed air-heater could meet a space heat loss of 35.6 W per square meter floor area, using supply water of 40 degrees C. It was also shown that the heat pump efficiency in the hydronic system with proposed air-heater was 8-18% higher than in system without air-heater. All results in the present study were obtained by analytical (semi-empirical) and numerical (Computational Fluid Dynamics - CFD) calculations.
Place, publisher, year, edition, pages
2013. Vol. 65, 248-259 p.
Low-temperature heating, Forced convective heat transfer, Transitional flow regime, Energy efficiency, Heat exchangers, Radiator heating, Ventilation, CFD
IdentifiersURN: urn:nbn:se:kth:diva-131710DOI: 10.1016/j.enbuild.2013.04.011ISI: 000324449800027ScopusID: 2-s2.0-84880058681OAI: oai:DiVA.org:kth-131710DiVA: diva2:657152
FunderSwedish Energy Agency
QC 201310182013-10-182013-10-172013-10-29Bibliographically approved