Thermal Analysis Of An Evacuated Tubular Collector Using Fourth Order Runge-Kutta Methods And Validation With Experimental Data
Loading...
Date
2010-04
Authors
Thominathan, Gyanaprakash
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
This thesis presents the thermal performance of the evacuated tubular collectors.
Ener$y balance inside the tubular collector has been investigated theoretically and
expehmentally. A transient one-dimensional mathematical model was developed
allowing the prediction of conductive heat transfer within the envelope tube,
conv~ctive and radiation heat transfer from the envelope tube towards the receiver
and ~e working fluid. The governing differential equations were solved numerically
via the fourth order Runge-Kutta method using MA TLAB 7.0 to compute the
tran$ient one-dimensional model of the evacuated tubular collectors.
A transparent single tube collectors (STC) and transparent evacuated tube
coll~ctors (ETC) were fabricated using glass in concentric cylinder form and
performance of this tubular collector was measured under sunlight. The
effectiveness of liquid absorptivity was investigated by adding black ink in the water
at various concentrations between 0.0025% to 0.025%. The computed mathematical
models were verified both analytically and experimentally. The temperature profiles
of water for different concentrations of black ink, flow rate and the solar flux were
determined in the present studies.
A iparametric variation study was used to illustrate the effect of varying collector
p~rameters. Non dimensional equations were developed and major parameters that
affect the collector performance were obtained. This study provides insight into the
sifnificant design parameters for an evacuated tubular collector.
Description
Keywords
The thermal performance of the , evacuated tubular collectors