Basic test results are reported for a flat plate solar collector whose performance was determined in a solar simulator. The collector was tested over ranges of inlet temperatures, fluxes and one coolant flow rate. Collector efficiency is correlated in terms of inlet temperature and flux level

Johnson, S. M.

English

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Produced by the NASA Center for Aerospace Information (CASI) 
https://ntrs.nasa.gov/search.jsp?R=19770006592 2020-03-22T12:23:03+00:00Z
Rby Susan M. Johnson
Lewis Research Center
Cleveland, Ohio 44135
November 1976
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JAN 191	 `^RECV,^
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(NASA-TA-1-73553) STAIIDARLIZFD PLUCKMANCL	 S77-13535
TESTS OF COLLRCICRS OF SOLAR THERHAL ENERGY
- A FLAT-ELATE COPPER COLLACTCH WITH
PARALLEL ATLAR STRIPING (NASA) 8 P HC 	 Unclas
Apt/AF Apt	 CSCL 10A G3/44 58230
NASA TECHNICAL
	
NASA TM X-73553
MEMORANDUM
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STANDARDIZED PERFORMANCE TESTS OF COLLECTORS OF SOLAR THERMAL,
ENERGY - A FLAT- PLATE COPPER COLLECTOR WITH PARALLEL MYLAR STRIPING
I I 1
1. Report No. 2. Government Accession No. 3. Recipient's Catalog No
NASA TM X-73553
4. Title and Subtitle STANDARDIZED PERFORMANCE TESTS OF 5. Report Date
COLLECTORS OF SOLAR THERMAL ENERGY - A FLAT-PLAT
R. Performing Organization CodeCOPPER COLLECTOR WITH PARALLEL MYLAR STRIPING
7. Author(s) S. Performing Organization Report Nu.
Susan M. Johnson E-8991
10. Work Unit No.
9. Performing organization Name and Address
Lewis Research Center 11. contract or Grant No.
National Aeronautics and Space Administration
Cleveland, Ohio 44135 13. Type of Report and Period Covered
Technical Memorandum12, Sponsoring Agency Name and Address
National Aeronautics and Space Administration 14 Sponsoring Agency Code
Washington, D. C.	 20546
15. Supplementary Notes
16. Abstract
This preliminary data report gives basic test results of a flat-plate solar collector whose per-
formance was determined in the NASA-Lewis solar simulator. The collector was tested over
ranges o: J.let temperatures, fluxes and one coolant flow rate. Collector efficiency is corre-
lated in terms of inlet temperature and flux level.
17. Key Words (Suggested by Author(s))
	
18. Distribution Statement
Solar simulator	 Unclassified - unlimited
Solar collector
Solar thermal energy
19. Security Classif. (of this report) 20. Security Classif. (of this page)
	
_
1	 ti	 of P"25	 22, Nice*
Unclassified	 Unclassified
For sale by the National Technical Information Service, Springfield 1 „ 	 a .12,64
.+.
STANDARDIZED PERFORMANCE TESTS OF COLLECTORS OF
SOLAR THERMAL ENERGY - A FLAT-PLATE COPPER
COLLECTOR WITH PARALLEL MYLAR STRIPING
by Susan M. Johnson
Lewis Research Center
INTRODUCTION
An area that has been investigated by the NASA Lewis Research
Center in its efforts to aid in the utilization of alternate energy sources
is the use of solar energy for the bating and cooling of buildings. An
v^
	 important part of this effort was the evaluation of solar collectors which
o^
co
	 have the potential to be efficient, economical, and reliable.
W	 This preliminary data report gives basic test results of a collector
whose performance was determined in the NASA-Lewis solar simulator.
In the interest of providing performance data on this collector to the
technical community as quickly as possible, the basic test results re-
ported herein are presented without evaluation. Detailed analyses and
interpretation of these results may be presented in subsequent papers
or reports by this Center. Some of the results contained in this report
may be changes as warranted by reviews and evaluations, or by obtaining
additional data on this collector.
Reference 1 describes the solar-simulator test facility, as well as
the basic test procedure.
COLLECTOR DESCRIPTION
This collector (the SS-6) was made by Sunsav, Inc. of Lawrence,
Massachusetts. It consists of a copper roll bond absorber plate with an
STAR Category 44
2absorber area of 19.38 sq ft. Black paint is utilized as the absorber
coating. Mylar strips running the width of the collector are installed
to decrease convection and reradiation losses. These mylar strips are
4 inches deep and are 3/8 of an inch apart. The collector housing is
aluminum and has a single glass cover. The insulation of the collector
is composed of several inches of glass wool and polyurethane. A photo-
.	 graph of the collector on the test stand is shown in figure 1.
COLLECTOR TEST RESULTS
Basic test results are given in Table I. Since this collector was
larger than the area of radiation provided by the solar simulator, it was
necessary to use a "shield" approach as explained in Reference 1. This
technique allows one to determine the efficiency of the entire collector
even though only a portion of it is actually exposed to radiation. By
using the analytical method outlined in Reference 1 for a collector tested
with a "shield", the results given for the flow rate in Table I were used
for a determination of the performance correlation given in Figure 2.
In addition to the basic test performed on the collector, a series of
incident angle tests were run to help predict the effect the mylar strips
might have on collector performance for daily and seasonal changes of sun
incidence angle. Table H lists the collector efficiency, at various rota-
tion and incidence angles, along with K IT values. One analytical
method for interpreting and using this data can be found in Reference 1.
REFERENCE
1. Simon, Frederick F.: Flat-Plate Solar-Collector Performance Eval-
uation with a Solar Simulator as a Basis for Collector Selection and
Performance Prediction. NASA TM X- 71793, 1975.
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anglea angleb angle 
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150 00 42.0 0.690 0.915
30 7.7 .467 .619
50 12.7 .447 .593
70 17.2 .396 .525
80 19.2 .379 .503
300 0 27.0 0.701 0.930
30 14.9 .592 .785
50 24.4 .532 .706
70 33.3 .470 .623
80 37.5 .424 .562
450 0 12.1 0.694 0.920
30 21.1 .678 .899
50 34.8 .743 .985
70 47.9 .508 .674
80 54.1 .435 .577
570 0 0 0.754 1.0
30 25 .713 .946
50 41.4 .680 .902
70 57.4 .603 .800
80 61.9 .475 1630
aTilt angle - the angle between the horizontal and
the plane of the collector.
bRotation angle - the angle that is measured in re-
lation to the x-axis when the collector is rotated
around the z-axis,
cIncidence angle - the angle that is measured between
the beam of light and the normal to the plane of the
collector.	 r	 ^Y.4.
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Standardized performance tests of collectors of solar thermal energy - A flat-plate copper collector with parallel mylar striping

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