PERFORMANCE ANALYSIS OF PARABOLIC TROUGH COLLECTORSPTC

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Title: PERFORMANCE ANALYSIS OF PARABOLIC TROUGH COLLECTORSPTC

1
PERFORMANCE ANALYSIS OF PARABOLIC TROUGH
COLLECTORS(PTC)

2
OVERVIEW

3
COMPONENTS IN A SOLAR THERMAL SYSTEM

4
CLASSIFICATIONConcentration Ratio(CR)Aperture
Area/Absorber Area
5
TYPES OF FOCUSSING COLLECTORS

6
PARABOLIC TROUGH COLLECTORS(PTC)CRgt10
Schematic of a PTC
7
PARABOLIC TROUGH COLLECTORS(PTC)

8
DESIGN CONSIDERATIONS

To reduce the heat loss due to convection and
conduction, the space between absorber and cover
is evacuated.
The absorber is painted with a high absorptance
paint.
Cover material is selected to have high
transmittance. A reflective coating is also
applied on the inside of the cover to reflect the
radiation back onto the absorber.

9
HOW DO WE SIMULATE THIS COLLECTOR?
Qu It x Fr x A x No - Heat loss
10
MODEL DIAGRAM
11
MODELING THE COLLECTOR

Heat gained by the absorber is given by
Qu (It x No x Ac) - (heat loss from the
collector)
Where,
It, beam radiation depends on type of tracking
used.
No, optical efficiency depends on
mirror reflectance , transmittance of cover,
absorptance of receiver etc.
Ac, collector area
Major heat loss is by radiation as the other
forms of heat transfer are negligible and are
eliminated to some extent using proper design.

12
MODEL PARAMETERS

13
RESULTS
14
RESULTS
15
RESULTS
16
CONCLUSION BASED ON GRAPHS

Although the results are also plotted for 2-Axes
tracking, the PTC system is commonly used in
single axes tracking mode only.
Based on the results obtained from the graphs, a
PTC tracked along the polar axis seems to give
the highest temperature of exit water for the
given conditions. Based on this conclusion,
further analysis is performed on a system tracked
along the polar axis.

17
RESULTSCR 50, W 4m and L20 m
18
RESULTSCR 50, W 4 m and L 20 m
19
RESULTSCR 50, W 4 m and Length 20 m
20
ECONOMIC ANALYSIS

The system is capable of supplying steam at a
temperature above 165 C and at the rate of 246
lb/hr for about 1070 hours in a year in Dayton.
We have seen companies purchasing steam at a rate
of 8.49 per thousand pounds. This gives a
saving of about 2,235 per year.
Estimating that such a system would cost about
10,000 to install, the simple payback would be
about 4 years.
From the analysis, this mass flow rate was found
to give the minimum payback.

21
APPLICATIONS

22
CONCLUSION

From the results we can see that these systems
can be used to generate steam for various
applications.
The best system seems to be the one that is
tracked along the polar axes.