ISSN Online: 2377-424X
International Heat Transfer Conference 12
Mechanical and thermal performance of polymer heat exchangers for solar hot water
Resumo
On-going work to develop polymer heat exchangers for solar applications addresses material properties and
natural convection heat transfer of immersed tube bundles. This paper presents creep data for polybutylene tubes
in air at 99% relative humidity. Natural convection heat transfer of a tube bundle immersed in a solar collector is
interpreted from experiments with a single horizontal tube. Temperature measurements permit characterization
of natural convection in the enclosure. Data are correlated by NuD = 0.675RaD0.25 for 106 < RaD < 108.