Modelling the efficiency of a nanofluid-based direct absorption parabolic trough solar collector
(چکیده مقاله) :
Abstract :
In this paper we propose an approximate analytic solution to the steady state, three-dimensional model of the
efficiency of a nanofluid-based direct absorption parabolic trough solar collector under a turbulent flow regime.
The model consists of a system of equations: a partial differential equation describing the conservation of energy,
and a radiative transport equation describing the propagation of radiation through the nanofluid. Writing the
model in non-dimensional form leads to four controlling non-dimensional numbers, specifically one describing
the relative importance of conduction and advection and three representing the heat loss to the surroundings.
We use realistic parameter values to reduce the model further and show that two of the non-dimensional groups
have a much lesser impact on the performance of the solar collector. Our reduced model suggests that the
nanofluid’s temperature rise is linear as it flows through the receiver. The resulting solution is used to investigate
the efficiency of the collector and permits optimisation of design parameters such as particle loading, particle
type, solar absorption characteristics of the fluid, receiver dimensions, the inlet temperature, and solar concentration
ratio. Further analysis of the collector efficiency reveals an inequality that determines whether or not
it is reasonable to incorporate a heat-mirror into the solar collector’s design.
efficiency of a nanofluid-based direct absorption parabolic trough solar collector under a turbulent flow regime.
The model consists of a system of equations: a partial differential equation describing the conservation of energy,
and a radiative transport equation describing the propagation of radiation through the nanofluid. Writing the
model in non-dimensional form leads to four controlling non-dimensional numbers, specifically one describing
the relative importance of conduction and advection and three representing the heat loss to the surroundings.
We use realistic parameter values to reduce the model further and show that two of the non-dimensional groups
have a much lesser impact on the performance of the solar collector. Our reduced model suggests that the
nanofluid’s temperature rise is linear as it flows through the receiver. The resulting solution is used to investigate
the efficiency of the collector and permits optimisation of design parameters such as particle loading, particle
type, solar absorption characteristics of the fluid, receiver dimensions, the inlet temperature, and solar concentration
ratio. Further analysis of the collector efficiency reveals an inequality that determines whether or not
it is reasonable to incorporate a heat-mirror into the solar collector’s design.
(توضیحات تکمیلی) :
(توضیحات تکمیلی) :
Description :
مقاله ISI انگلیسی اصلی
سال انتشار:2018
فایل ISI انگلیسی اصلی ، با فرمت Pdf
تعداد صفحات فایل ISI انگلیسی اصلی: 11 صفحه
سال انتشار:2018
فایل ISI انگلیسی اصلی ، با فرمت Pdf
تعداد صفحات فایل ISI انگلیسی اصلی: 11 صفحه
Authors / Descriptions(نویسندگان/توضیحات): مقاله ISI سال انتشار2018 \ G.J. O’Keeffea,⁎, S.L. Mitchella, T.G. Myersb, V. Cregana
Sent date(تاریخ ارسال) :
1397/10/26 | 1/16/2019
Number of visits(تعداد بازدید):
809
Key words (کلمات کلیدی):
Nanofluid Direct absorption solar collector Parabolic trough Solar energy
Number of pages(تعداد صفحات) :
11
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