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In this study the effect of nanofluids on collector
performance was numerically investigated when using as
working fluids in solar collectors which are commonly used in
solar energy applications. Nanofluids are produced by adding
nanoparticles to a base fluid as known. Thermophysical
properties of base fluids change. The most important property of
nanofluids is thermal conductivity enhancement. In this study
ethylene glycol – water mixture was used as a base fluid which is
especially used as cold climates for reducing freezing point. The
reasons for this are expanding the range of working temperature
and preventing the flow from higher density and viscosity of
ethylene glycol at the same time. TiO2/EG-Pure Water
nanofluids were used as working fluids in an evacuated U-tube
solar collector at 1.0 – 4.0% volumetric concentrations with 30-
70% EG-PW base fluid for determining the effect of nanofluids
on collector thermal efficiency. An evacuated tube solar collector
with copper U-tube was modeled in FLUENT 17.0 and thermal
efficiency of it was calculated by solving of flow field of the
collector. 18.1% enhancement was obtained as maximum in
thermal efficiency when using nanofluid as a working fluid. It
was determined that the flow rate of the fluid was a significant
parameter on thermal efficiency of the solar collector. The
highest collector efficiency was obtained at 4.0% nanoparticle
volume concentration and ṁ=0.045 kg/s.
1.st International Conference Energy Systems Engineering
ıcese'17
Hüseyin Kaya
Kamil ARSLAN