Monthly performance report

MISSING IMAGE

Material Information

Title:
Monthly performance report Concord Light Plant
Series Title:
SOLAR ; 2048-79/04
Added title page title:
Concord Light Plant
Physical Description:
v. : ill. ; 28 cm.
Language:
English
Creator:
United States -- Dept. of Energy
Publisher:
Dept. of Energy
Place of Publication:
Washington

Subjects

Subjects / Keywords:
Solar energy -- Massachusetts -- Concord   ( lcsh )
Solar heating   ( lcsh )
Genre:
federal government publication   ( marcgt )
non-fiction   ( marcgt )

Notes

General Note:
MONTHLY CATALOG NUMBER: gp 80007834
General Note:
National solar heating and cooling demonstration program.
General Note:
National solar data program.
General Note:
Apr. 1979.

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 022617864
oclc - 05982403
System ID:
AA00013814:00001


This item is only available as the following downloads:


Full Text
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S i '


SOLAR/2048-79/04

Monthly
Performance

Report


CONCORD LIGHT PLANT
APRIL 1979


U.


S.


Department of Energy

National Solar Heating and
Cooling Demonstration Program

National Solar Data Program


:JLt(







































NOTICE
This report was prepared as an account of work sponsored by the United States
Government. Neither the United States nor the United States Department of Energy, nor
any of their employees, nor any of their contractors, subcontractors, or their employees,
make any warranty, express or implied, or assume any legal liability or responsibility for
the accuracy, completeness or usefulness of any information, apparatus, product or
process disclosed, or represents that its use would not infringe privately owned rights.







MONTHLY PERFORMANCE REPORT
CONCORD LIGHT PLANT
APRIL 1979


I. SYSTEM DESCRIPTION

The solar energy installation at the Concord Light Plant, Concord,
Massachusetts, is an air system that provides space heating for a munici-
pal garage and office area. The system, shown schematically in Figure
1, consists of an array of 92 flat-plate collectors, manufactured by
Sunworks, having a gross arca of 1,932 square feet. The collector array
faces 14 degrees east of south at an angle of 57 degrees from the horizon-
tal. Solar energy is stored in a rock thermal storage bin with a capacity
of 1,210 cubic feet. It is located in a corner of the garage. This
solar energy system also includes a fan, seven motorized dampers and
duct work. Auxiliary energy is provided by electrical resistance heaters
rated at approximately 140 kw. The solar energy system is designed to aid
in maintaining the garage temperature at 500F. If any additional energy
is available, it is delivered to the office area, which is maintained at
approximately 680F. The system air flow is controlled by six motor-driven
dampers. If the solar heated air is too hot for delivery, the seventh
damper, which is the tempering damper D6, mixes ambient garage air with
the solar heated air. The system has three modes of solar operation.


Mode 1 Collector-to-Space Heating: In this mode, solar heated air is
delivered directly from the collector array to the conditioned space.
This will happen whenever there is a demand for space heating and the
collector array temperature is higher than the conditioned space or
storage temperatures.


Mode 2 Collector-to-Storage: The system enters this mode whenever the
space heating demands have been satisfied and the collector array tempera-
ture is higher than the storage temperature. The dampers are positioned
to deliver solar heated air directly to storage.











































(TEMPERING)'


M D3 D5

j RETURN
AIR
T450





v T200

.. REVISED 2/6/79


Figure 1. CONCORD LIGHT PLANT SOLAR ENERGY SYSTEM SCHEMA TIC







Mode 3 Storage-to-Space Heating: This mode is entered whenever a demand
for space heating exists and the collector array temperature is .lower than
the temperature of the conditioned space. If the storage bin temperature
is higher than the temperature of the conditioned space, then heated air is
taken directly from storage and circulated through the conditioned space.

II. PERFORMANCE EVALUATION

The system performance evaluations discussed in this section are based
primarily on the analysis of the data presented in the attached computer-
generated monthly report. This attached report consists of daily site
thermal and energy values for each subsystem, plus environmental data. The
performance factors discussed in this report are based upon the definitions
contained in NBSIR-76-1137, Thermal Data Requirements and Performance Eval-
uation Procedures for the National Solar Heating and Cooling Demonstration
Program.

A. Introduction

The Concord Light Plant solar energy system was operational throughout the
month of April. However, problems in the data collection and processing
system resulted in the loss of 19 days of data for the month. Therefore,
there are no monthly averages presented for April in this report. It is
not feasible to extrapolate averages for a transitional month such as
April with only 11 days of data to work with.

The first data loss period occurred from April 1 through April 7, and the
second data loss period occurred from April 9 through April 17. Both of
these data loss periods were related to problems in the Site Data Acquisi-
tion Subsystem (SDAS), and a site visit was made on April 7 and again on
April 17 to repair the SDAS. The second site visit on April 17 seemed to
correct the SDAS problems, but additional problems of unknown origin caused
data to be lost on April 24, 25, and 30.







For the 11 days covered by this report the solar energy system satisfied
approximately 90 percent of the space heating energy requirements at the
Concord Light Plant. This resulted in a net savings of 3.05 million Btu
of electrical energy. A total of 0.77 million Btu of electrical operating
energy was required to support the solar energy system.

B. Weather

Because April is a transitional month in the Concord area, both tempera-
ture and cloud cover are subject to considerable variation. For April,
the long-term average outside ambient temperature for the area is 470F,
and the average insolation incident in the plane of the collector array
is 1,239 Btu/ft2-day.

Both the long-term average temperature and insolation values are computed
from averages derived from three weather stations in the general area. Two
of these are located in the cities of Boston and Natick, and the third is
the Blue Hill Observatory, located in Milton. The Blue Hill Observatory
station is approximately 10 miles south of the Boston station and at a
much higher elevation. It is therefore not subject to the environmental
pollutants typical of a large city such as Boston.

C. System Thermal Performance

Collector During the abbreviated reporting period, a total of 32.68 mil-
lion Btu of incident solar energy was measured in the plane of the collec-
tor array. The system collected 7.88 million Btu, or 24 percent of the
total available insolation. During the time when the system was operating,
a total of 22.23 million Btu of solar energy was incident on the array.
This represents an operational collector efficiency of 35 percent. A total
of 0.44 million Btu of electrical energy was required to operate the col-
lector array.







Storage During the time when the system was operating in the Collector-
to-Storage mode, a total of 7.17 million Btu of solar energy was collec-
ted. Of this total, 5.72 million Btu were delivered to storage, and
consequently, 1.45 million Btu were lost between the collector array and
storage. However, approximately 1.16 million Btu of this loss was in the
form of leakage past damper D2 and thus served as an uncontrolled heat
input to the garage area.

Of the 3.38 million Btu extracted from storage to supply the space heating
load, 3.11 million Btu were delivered to the space heating load. The dif-
ference of 0.27 million Btu is primarily due to transport losses to the
building interior.

The change in stored energy (based only on the daily values, and not the sum
printed in the attached computer generated monthly report) was 1.90 million
Btu, and this, combined with the energy supplied to and removed from storage,
resulted in a thermal loss from storage of 0.44 million Btu. However, due
to the data loss problem these storage energy change and loss computations
should be viewed with caution. (Approximately 0.01 million Btu of the stor-
age loss was due to thermosiphoning losses through the collector array when
the system was off.)

Space Heating Load The space heating load for the 11 reportable days in
April was 4.26 million Btu. Solar energy supplied 3.82 million Btu of this
load, and the remaining 0.44 million Btu was supplied by the electrical
auxiliary system. This represents a heating solar fraction of 90 percent.

Of the 3.82 million Btu of solar energy supplied to the space heating load,
0.71 million Btu came directly from the collector array and the remaining
3.11 million Btu came from storage. A total of 0.33 million Btu of electri-
cal operating energy was required to deliver solar energy to the space heat-
ing load.







The 0.44 million Btu of auxiliary energy required to support the space
heating load was all expended in the office area. The solar energy system
was able to fully support the garage space heating requirements.

The overall building temperature was maintained at 65.60F. The average
garage temperature was 64.70F, and the average office temperature was
70.60F.

D. Observations

In general, the Concord Light Plant solar energy system performed well
during the periods for which data were available in April. There were
no system problems of any type discovered during this time.

E. Energy Savings

The Concord Light Plant solar energy system realized a gross savings of
3.82 million Btu in the electrical energy requirements for space heating
during the report period. However, solar energy was collected and deliv-
ered at a cost of 0.77 million Btu in electrical operating energy. The
electrical energy net savings for the overall system amounted to 3.05
million Btu.

III. ACTION STATUS


The data loss problem is currently under investigation. It is anticipated
that the problem will be isolated by the second week in May.








SOLAR HEATING AND COCLING DEMONSTRATION PROGRAM


SITE: CONCORD LIGHT
REPORT PERIOD: APRIL,1979


MONTHLY REPORT
SITE SUMMARY

CONCORD, MASS.


SOLAR/9999-79/04


SITE/SYSTEM DESCRIPTION:
THE CONCORD LIGHT SOLAR INSTALLATION PROVIDES SOLAR HEATING FOR THE
GARAGE AND OFFICE AREAS OF THE CONCORD MUNICIPAL LIGHT PLANT. THE
GARAGE CONTAINS 101,295 CU. F'. AND THE OFFICE SPACE CONTAINS 17,400
CU. FT. THE INSTALLATION IS AN AIR SYSTEM AND HAS 1210 CU. FT. OF
ROCK STORAGE. AUXILIARY HEATING IS PROVIDED BY ELECTRICITY WITH
112.5 KW AVAILABLE FOR THE GARAGE AND 29.6 KW AVAILABLE FOR THE OFFICE
AREA. TEMPERATURE LEVELS ARE 50F FOR THE GARAGE AND 68F FOR THE
OFFICE AREA.


GENERAL SITE DATA:
INCIDENT SOLAR ENERGY


* MILLION BTU
* BTU/SQ.FT.
* MILLION BTU
* BTU/SQ.FT.
* DEGREES F
* DEGREES F


COLLECTED SOLAR ENERGY

AVERAGE AMBIENT TEMPERATURE
AVERAGE BUILDING TEMPERATURE
ECSS SOLAR CONVERSION EFFICIENCY
ECSS OPERATING ENERGY
TOTAL SYSTEM OPERATING ENERGY
TOTAL ENERGY CONSUMED


* MILLION
* MILLION
* MILLION


SUBSYSTEM SUMMARY:

LOAD
SOLAR FRACTION
SOLAR ENERGY USED
OPERATING ENERGY
AUX. THERMAL ENERGY
AUX. ELECTRIC FUEL
AUX. FOSSIL FUEL
ELECTRICAL SAVINGS
FOSSIL SAVINGS


HOT WATER
N. A.
N.A.
N. A
N.A.
N.A.
N.A.
N A.
N .A
N. A


HEATING
*
*


N.A.
NA.*
N.A.


COOLING
N.A.
N.A.
N.A.
N.A.
N. A.
N.A.
N.A.
N.A.
N.A.


SYSTEM TOTAL
MILLION
PERCENT
MILLION
MILLION
MILLION
MILLION
N.A. MILLION
MILLION
N.A. MILLION


SYSTEM PERFORMANCE FACTOR:


* DENOTES UNAVAILABLE DATA
@ DENOTES NULL DATA
N.A. DENOTES NOT APPLICABLE DATA

REFERENCE: USER'S GUIDE TO THE MONTHLY PERFORMANCE REPORT
OF THE NATIONAL SOLAR DATA PROGRAM,FEBRUARY 2891978,
SOLAR/0004-78/18


BTU
BTU
BTU



BTU

BTU
BTU
BTU
BTU
BTU
BTU
BTU











SOLAR HEATING AND COOLING DEMONSTRATION PROGRAM


SITE: CONCORD LIGHT
REPORT PERIOD: APRIL,1979


MONTHLY REPORT
SITE SUMMARY

CCNCORD, MASS.


SOLAR/9999-79/04


SITE/SYSTEM DESCRIPTION:
THE CONCORD LIGHT SOLAR INSTALLATION PROVIDES SOLAR HEATING FOR THE
GARAGE AND OFFICE AREAS OF THE CONCORD MUNICIPAL LIGHT PLANT. THE
GARAGE CONTAINS 101,295 CU. FT. AND THE OFFICE SPACE CONTAINS 17,400
CU. FT. THE INSTALLATION IS AN AIR SYSTEM AND HAS 1210 CU. FT. OF
ROCK STORAGE. AUXILIARY HEATING IS PROVIDED BY ELECTRICITY WITH
112.5 KW AVAILABLE FOR THE GARAGE AND 29.6 KW AVAILABLE FOR THE OFFICE
AREA. TEMPERATURE LEVELS ARE 50F FOR THE GARAGE AND 68F FOR THE
OFFICE AREA.


GENERAL SITE DATA:
INCIDENT SOLAR ENERGY

COLLECTED SOLAR ENERGY

AVERAGE AMBIENT TEMPERATURE
AVERAGE BUILDING TEMPERATURE
ECSS SOLAR CONVERSION EFFICIENCY
SCSS OPERATING ENERGY
TOTAL SYSTEM OPERATING ENERGY
TOTAL ENERGY CONSUMED


* GIGA JOULES
* KJ/SQ.M.
* GIGA JOULES
* KJ/SQ.M.
* DEGREES C
* DEGREES C

* GIGA JOULES
* GIGA JOULES
* GIGA JOULES


SUBSYSTEM SUMMARY:

LOAD
SOLAR FRACTION
SOLAR ENERGY USED
OPERATING ENERGY
AUX. THERMAL ENG
AUX. ELECTRIC FUEL
AUX. FOSSIL FUEL
ELECTRICAL SAVINGS
FOSSIL SAVINGS


HOT WATER
N.A.
N.A.
N .A
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.


HEATING
*


N.A.

N.A.


COOLING
N.A.
N.A.
N .A
N.A.
N.A.
N.A A
N.A.
N.A.
N.A.


SYSTEM TOTAL
GIGA JOULES
PERCENT
GIGA J3ULES
GIGA JOULES
GIGA JOULES
GIGA JOULES
N.A. GIGA JOULES
GIGA JOULES
N.A. GIGA JOULES


SYSTEM PERFORMANCE FACTOR:


* DENOTES UNAVAILABLE DATA
8 DENOTES NULL DATA
N.A. DENOTES NOT APPLICABLE CATA

REFERENCE: USER'S GUIDE TO THE MONTHLY PERFORMANCE REPOPT
OF THE NATIONAL SOLAR DATA PRCGRAMFEBRUARY 28,1978,
SOLAR/0004-78/18










SCLAR HEATING AND COOLING DEMONSTRATION PROGRAM

MONTHLY REPORT
ENERGY COLLECTION AND STORAGE SUBSYSTEM (ECSS)


SITE: CONCORD LIGHT
REPORT PERIOD: APRIL,1979


DAY INCIDENT AMBIENT
OF SOLAR TEMP
MONTH ENERGY
MILLION
BTU DEG-F

1 *
2 *
3 *
4 *
5 *
6 *
7 *
8 4.536 37
9 *
10 *
11 *
12 *
13 *
14 *
15 *
16 *
17 *
18 3.528 43
19 3.162 43
20 3.959 45
21 4.262 47
22 2.273 54
23 4.103 59
24 *
25 *
26 2.801 65
27 0.299 62
28 2.683 62
29 1.071 57
30 *

SUM *

AVG *

NBS ID Q001 N113
---------- ---------- ----------- -

DENOTES UNAVAILABLE DATA.
8 DENOTES NULL DATA.
N.A. DENOTES NOT APPLICABLE CATA.


CONCORD, MASS.


ENERGY
TO
LOADS
MILLION
BTU







0.502









0.524
0.671*
0.289
0.978
0.243
0.073


0.143
0.000
0.066
0.334



*


AUX
THERMAL
TO ECSS
MILLION
BTU

N
0
T

A
P
P
L
I
C
A
B
L

















N.A.

N.A.
N*A








-


SOLAR/9999-79/04


ECSS
OPERATING
ENERGY
MILLION
BTU







0.061







0*069

0.055
0.060
0.0629

0.062
0.029
0.066


0.015
0.000
0.017
0.007





0102
~------~-----


ECSS
ENERGY
REJECTED
MILLION
BTU

N
O
T

A
P
P
L
I
C
A
B
L
E
















N.A.

N.A.


ECSS SOLAR
CONVERSION
EFFICIENCY









0.111








0.149
0.212
0.073
0.229
0.107
0.018


0.051
0.000
0.024
0.312





N111 1
0.051-- --









SOLAR HEATING AND CCOLING DEMONSTRATION PROGRAM

MONTHLY REPORT
COLLECTOR ARRAY PERFORMANCE


SITE: CONCORD LIGHT
REPORT PERIOD: APRIL,1979


CONCORD, MASS. SOLAR/9999-79/04


DAY
OF
MONTH



1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

SUM
-------
AVG

NBSID
I ---- ________


INCIDENT
SOLAR
ENERGY
MILLION
BTU
/----------






4.536








3.528
3. 162
3.959
4.262
2.273
4.103


2.801
0.299
2.683
1.071



----------

--------01
I Q001


- ---------I
OPERATIONAL
INCIDENT
ENERGY
MILLION
BTU







4.015
*




*
*
*
2.886
2.538
2.940
3.697
1.026
3.512


0.579
0.000
0.823
0.218
-


*


COLLECTED
SOLAR
ENERGY
MILLION
BTU
I----------I
*















0#919
1.467


*
*







09286
*068




0*173
0.963
0.919
1 140
1.481
0.286
1.068
*
*
0.173
0.000
0.288
0.094
1- *
1 !


*


--------- --------
0Q100


DAYTIME
AMBIENT
TEMP
DEG F








43
*











71
4




53
53
57
62
67








I----------
71


75
63
72
62
*


I---------

--__-------
*{
-m


COLLECTOR
ARRAY
EFFICIENCY


*
*

*


0.323
*
*






0.273
0.291
0.288
0.347
0.126
0.260


0.062
0.000
0. 107
0.088
----------


N100


* DENOTES UNAVAILABLE DATA.
8 DENOTES NULL CATA.
N.A. DENOTES NOT APPLICABLE DATA.









SOLAR hEATING AND COCLING DEMONSTRATION PROGRAM


MONTHLY REPORT
STORAGE PERFORMANCE


SITE: CONCORD LIGHT
REPORT PERIOD: APRIL 1979


CONCORD, MASS. SOLAR/9999-79/04


DAY ENERGY
OF TO
MONTH STORAGE
MILLION
BTU


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
is
19
20
21
22
23
24
25
26
27
28
29
30


SUM

AVG


*
*
*




0.904








0.773*
0.749
0.918
1*014
0.230
0.794

0.131
0.000
0.173
0.031
*


NBS ID Q200
___---- I ----_-----


ENERGY
FROM
STORAGE
MILLION
BTU

*
*
*
*



0.138








0.575
0.727
0.284
0.863
0.262
0.082
*
*
0.163
0.000
0.000
0.290
*


*1

0201


CHANGE
IN STORED
ENERGY
MILLION
BTU


*




0.956








0.161
0.067
0.810
0.269
-0.317
0 .688

-0.190
-0.098
-0. 055
-0.024
-0.364


4.762

0.159


Q202


STORAGE
AVERAGE
TEMP
DEG F

----------






80







79

83
87
97
105
117
*

130
128
126
120
*









*


STORAGE
EFFICIENCY










1.209








0.952
1.060
1.192
1.116
-0.238
0.970
*

0.497
1.000
-0.139
-2.392
*


-
---------- -----------
N108
--- I -


* DENOTES UNAVAILABLE DATA.
8 DENOTES NULL CATA.
N.A. DENOTES NOT APPLICABLE DATA.


I--- ---~









SOLAR HEATING AND COOLING DEMONSTRATION PROGRAM


MONTHLY REPORT
SPACE HEATING SUBSYSTEM


SITE: CONCORD LIGHT
REPORT PERIOD: APRIL,1979


CONCORD, MASS.


SOLAR/9999-79/04


DAY
OF
MON.


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

SUM

AVG

NBS


SPACE
HEATING
LOAD
MILLION
BTU







0.613
*

*











0.580
0.7461
0*360
1053
0.261
0.098
*
O0 143

S0002
0.066
0.334





0402


SOLAR I
FF.OF
LOAD
PCT








82








90
*
*
*







9
*







82
*
*









93
93
75
*









100
90
100
100


-

*N400
N400


SOLAR OPER
ENERGY ENERGY
USED
MILLION MILLION
BTU BTU







00502 0,022
*1















0524 0048
671 076








09289 09054
0.978 09075
0.243 0*017
0,073 0.006
*
*1



















0*143 0o.007
0,000 0.000
*










066 0002
0.50234 0.022



0400 0403
*
0.524 0.048
0.671 0.076
0.289 0.054
0.978 0.075
0.243 0.017
0.073 0.006
*

0.143 0.007
0.0001 0.000
0.066 0.002
0.334 0.023
*





0400 Q403


AUX
THERMAL
USED
MILLION
BTU

*





0.111








00561*
0.075
0.071
0.076
0.019
0.024


0. 002

0.000





0401
0401 |


AUX
ELECT
FUEL
MILLION
BTU







0.111
*
*
*






0 056
0.075
0 071
0.071
0 076
0.019
0.024
*
*
0.000
0.002
0.000
0.000
*

*


AUX
FOSSIL
FUEL
MILLION
BTU

N
0
T

A
P

L
I
C
A
B
L
E
















N.A.

N.A.

0410
I I---------


FOSSIL
ENERGY
SAVINGS
MILLION
BTU

N
0
T

A
P
P
L
I
C
A
B
L
E


ELECT
ENERGY
SAVINGS
MILLION
BTU

*





0.479*
0.479
*
*







*068

*136
*064
*
0.476
0.595
0.235
0.903
0.226
0 068


0.136
0.000
0.064
0 .31 1






0415
0,595-----


* DENOTES UNAVAILABLE DATA.
@ DENOTES NULL DATA.
N.A. DENOTES NOT APPLICABLE DATA.


N.A I
N.A.

0417


BLDG
ITEMP

DEG.
F

*
*
*




58








62
64
4*
*







68
64



70
687
64
68
*1


*N
67
69
681





N406


AMB
TEMP

DEG.
F

*
*

:1
*



37
*
*




4

43
45
43
45
471
54
59
*

65:
62
62
57
*





N113
-----I







SOLAR HEATING AND COOLING DEMONSTRATION PROGRAM

MONTHLY REPORT
ENVIRONMENTAL SUMMARY


SITE: CCNCORD LIGHT
REPORT PERIOD: APRIL,1979


DAY TOTAL DIFFUSE
OF INSOLATION INSOLATION T
MONTH
BTU/SQ.FT BTU/SQ.FT

1 N
2 0
3 T
4
5 A
6 P
7 P
8 2348 L
9 I
10 C
11 A
12 B
13 L
14 E
15 *I
16
17 *
18 1826
19 1636
20 2049
21 2206
22 1177
23 2123
24
25
26 1450
27 155
28 1389
29 554
30 *

SUM N.A.

AVG N.A.

NBS ID Q001


* DENOTES UNAVAILABLE DATA.
@ DENOTES NULL DATA.
N.A. DENOTES NOT APPLICABLE DATA.


CONCCRD, MASS.


AMBIENT
TEMPERATURE

DEG F

*






37
*













4

43
45
47
54
59


62
62
57
I
i
4-- -















Ni113


DAYTIME
AMBIENT
TEMP
DEG F

*






43








53
53
57
62
67
71
*












4
*













75
63
72
62
67

*





--- -


-


SOLAR/9999-79/04


RELATIVE
HUMIDITY

PERCENT







31








28
25
23




24
26
22
*
*













33
60
51
49
*





28
25





-23

26-
22- -









*


WIND
DIRECTION

DEGREES

N
0
T

A
P
P
L
I
C
A
B
L
E
















-----------j

N.A.

N115


WIND
SPEED

M.P.H.

N
0
T

A
P
P
L
I
C
A
B
L
F
















-------------I

N.A.

N114
- -







UNIVERSITY OF FLORIDA
1 1 1 I 7I 1 I I 4 I 11 II1'1 I
3 1262 07122 4231





















































































































































































































































II_




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