Monthly performance report

-I :


I-


SOLAR/2016-79/05


Monthly
Performance
Report


LOUDOUN COUNTY
MAY 1979


U.


S.


Department of Energy


National Solar


Heating and


Cooling Demonstration Program

National Solar Data Program





































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.


-14








MONTHLY PERFORMANCE REPORT


LOUDOUN COUNTY

MAY 1979

I. SYSTEM DESCRIPTION


The Loudoun County site is the Charles S. Monroe Vocational Technical School
located in Leesburg, Virginia. Solar energy is used for preheating domestic
hot water (DHW). The solar energy system has an array of flat-plate collectors
with a gross area of 1225 square feet. The array faces 15 degrees west of
south at an angle of 37 degrees to the horizontal. A silicone oil solution
is the transfer medium that delivers solar energy from the collector array
to a heat exchanger. Solar energy is stored within the building in a
2056-gallon water tank.


Preheated water is supplied from the solar storage tank to a 1000-gallon DHW
tank. Hot water from the DHW tank is circulated through the service hot
water lines and back to the DHW tank to instantly provide hot water at the
service taps. This circulation is controlled by a time clock so that circula-
tion occurs only during hours of normal use. An electrical heating element
immersed in the DHW tank provides auxiliary energy, as required, to maintain
the desired 1400F service water temperature. The system, shown schematically
in Figure 1, has four modes of operation, all of which operate independently
of one another.


Mode 1 Collector-to-Storage: This mode activates when there is a tempera-
ture difference of 20F between a control sensor located at the collector
and a control sensor located inside the storage tank (near the bottom). At
this time the collector turns on pump P1 which circulates the transport fluid
through the collectors and the heat exchanger located inside the storage tank.
P1 continues to operate until the temperature difference between the control
sensors is less than 5F. At this point P1 turns off and the mode terminates.
Mode 1 will also terminate when the storage tank temperature exceeds 2000F,
as measured by another control sensor near the top of the storage tank.














COLLiCTOH PLANE TOTAL INSOLATION
OUTDOOR TEMPERATURE
WIND DIRECTION
WIND SPEED


Figure 1. LOUDOUN COUNTY SCHOOL SOLAR ENERGY SYSTEM SCHEMA TIC


* T001
Y TOOT
* D001
* Vo00


DOMESTIC
HOT WATER
RECIRCULATION
LOOP









Mode 2 Solar Energy Preheat: This mode activates when there is a tempera-
ture difference of 20F between a control sensor located near the top of the
storage tank and a control sensor located near the bottom of the DHW tank. At
this time the controller energizes pump P2 which delivers preheated water from
the storage tank to the DHW tank and recirculates water from the DHW tank to
the storage tank. When the temperature difference between the control sensors
becomes less than 5F, pump P2 turns off and the mode terminates. An electrical
element in the DHW tank is energized to provide auxiliary water heating when
the DHW tank temperature falls below a set point.


Mode 3 Recirculate: This mode activates (under time-clock control) during
hours of normal use, i.e., primarily during daylight and early evening hours
every day of the week except Sunday. When activated, pump P3 is energized and
hot water circulates from the hot water tank through the service hot water
lines and returns to the hot water tank.


Mode 4 DHW Load: This mode activates when hot water is drawn from any of
the hot water taps in the building. The hot water demand is replenished by
cold water supplied to the storage tank. The make-up water to the DHW tank
from the storage tank goes through P2 (if mode 2 is active at this time) or
bypasses P2 if mode 2 is inactive. Mode 3 need not be activated to supply the
demand at the hot water taps.



II. PERFORMANCE EVALUATION



INTRODUCTION


The school was in session during the month of May and the solar energy system
operated continuously during the month. Total solar energy collected was 18.8
million Btu and the total solar energy used was 10.2 million Btu or 54 percent
of the collected energy. The stored energy decreased by 0.25 million Btu and
the total system losses amounted to 14.7 million Btu. Solar energy satisfied










89 percent of the DHW requirements. The solar energy system provided an
electrical energy savings of 9.9 million Btu. The performance factors are
discussed below and presented in the accompanying report forms.



WEATHER CONDITIONS


During the month, total incident solar energy on the collector array was
5-1.8 million Btu for a daily average of 1444 Btu per square foot. This was
below the estimated average daily solar radiation for this geographical area
during May of 1579 Btu per square foot for a plane facing 15 degrees west of
south with a tilt of 37 degrees to the horizontal. The average ambient
t-:mperature during May was 64F as compared with the long-term average for May
of 630F. The number of heating degree-days for the month (based on a 65F
reference) was 101, as compared with the long-term average of 131. The number
of cooling degree-days was 64, as compared with the long-term average of 57.



THERMAL PERFORMANCE


System During May the solar energy system performed approximately the same
as expected. The expected performance was determined from a modified f-chart
analysis using measured weather and subsystem loads as input. Solar energy
used by the system was estimated by assuming that all energy collected would
be applied to the load. Actual solar energy used was 10.2 million Btu versus
an estiii.ited 10.6 million Btu. System total solar fraction was 89 percent
versus an estiiiated 92 percent.


Collector The total incident solar radiation on the collector array for the
ninth of May was 54.8 million Btu. During the period the collector loop was
o,,.rating, the total insolation amounted to 45.8 million Btu. The total
collected solar energy for the :,nth of '-.,y was 18.8 million Btu, resulting in
a collector array efficiency of 34 percent, based on total incident insolation.
Solar energy delivered from the collector array to storage was 15.4 million
Btu: energyy loss during transfer from the collector array to storage was








3.4 million Btu. This loss represented 18 percent of the energy collected.
Operating energy required by the collector loop was 0.29 million Btu.


Storage Solar energy delivered to storage was 15.4 million Btu. There were
10.2 million Btu delivered from storage to the DHW subsystem. Energy loss
from storage was 5.4 million Btu. This loss represented 35 percent of the
energy delivered to storage. The storage efficiency was 65 percent: This is
calculated as the ratio of the sum of the energy removed from storage and the
change in stored energy, to the energy delivered to storage. The average
storage temperature for the month was 1160F.


DHW Load The DHW subsystem consumed 10.2 million Btu of solar energy and 1.3
million Btu of auxiliary electrical energy to satisfy a hot water load of 5.6
million Btu. The solar fraction of this load was 89 percent. Losses from the
DHW subsystem were 5.9 million Btu. The DHW subsystem consumed a total of
0.13 million Btu of operating energy, resulting in an electrical energy
savings of 10.2 million Btu. A daily average of 370 gallons of DHW was con-
sumed at an average temperature of 1180F delivered from the tank.



OBSERVATIONS


On May 3 the mode 1 control sensor located inside the storage tank was lowered
by the grantee to a location near the bottom of the tank. Since that time
mode 1 deactivation has often occurred after the insolation reached a point
when energy was no longer being collected. As a result, some of the previously
collected solar energy was radiated by the collector array to the outside
ambient. Extended mode 1 operation occurred on 19 of the 26 days in which
mode 1 operated since the sensor was moved. Analysis shows that this extended
mode 1 operation represented about 6 percent of the total mode 1 operating
time during the month and resulted in 0.21 millionn Btu being radiated to the
outside ambient by the collector array. It has been recomiiended that the
control sensor be repositioned higher in the storage tank to improve mode 1
deactivation control.









A total of 3.2 million Btu, representing 54 percent of the DHW subsystem
losses, were lost in the service hot water lines during mode 3 operation.



ENERGY SAVING>


The solar energy system provided a net electrical energy savings of 9.9 mil-
lion Btu. The DHW subsystem provided an electrical energy savings of 10.2
million Btu.



III. ACTION STATUS


A iijlfunctioning sensor (W302) must be replaced by IBM, pending NASA approval,
and the -node 1 control sensor in the bottom of storage should be repositioned
higher in the tank. No date has been established for either action.











SOLAR HEATING AND COOLING DEMONSTRATION PROGRAM


MONTHLY REPORT
SITE SUMMARY


SITE: LOUDOUN COUNTY
REPORT PERIOD: MAY,19779


SOLAR/2016-79/05


SITE/SYSTEM DESCRIPT ION:
THE LOUDOUN COUNTY SOLAR ENERGY SYSTEM PRCVICES DOMESTIC HOT WATER PRE-
HEATING FOR THE CHARLES S. MONROE VOCATIONAL TECHNICAL SCHOOL. THE FLAT
PLATE COLLECTOR ARRAY HAS A GROSS AREA OF 1225 SQ FT. SOLAR ENERGY STO-
RAGE CONSISTS OF A 2056 GAL WATER TANK WHICH SERVES AS A PREHEAT TANK
FOR THE HOT WATER SUPPLY. A 10CO GALLON STORAGE WATER HEATER IS SUP-
PLIED FROM THE PREHEAT TANK AhC CONTAINS AN ELECTRIC AUXILIARY HEATING
ELEMENT TO PROVIDE SUPPLEMENTAL HEATING AS REQUIRED.


GENERAL SITE DATA:
INCIDENT SOLAR ENERGY


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


54.840
44768
18. 800
15347
64
N.A.
0.19
0.293
0.426
20.518


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


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


HCT WATER
5.608
89
10.236
0.133
1.292
1.292
N.A.
10.199
N.A.


HEATING
N. A.
N.A.
N. A.
NA.
N. A.
N.A.
N.A.
N. A.
N. A.


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


SYSTEM TOTAL
5.608 MILLION
89 PERCENT
10.236 MILLION
0.426 MILLION
1.292 MILLION
1.292 MILLION
N.A. MILLION
9.907 MILLION
N.A. MILLION


SYSTEM PERFORMANCE FACTOR:


0 .80


* DENOTES UNAVAILABLE DATA
@ DENOTES NULL CATA
N.A. DENOTES NOT APPLICABLE DATA
REFERENCE: USER'S GUIDE TO THE MONTHLY PERFORMANCE REPORT
OF THE NATIONAL SOLAR DATA PROGRAM,FEBRUARY 28,1978,
SOLAR/0004-78/18


BTU
BTU
BTU
BTU
BTU
BTU
BTU
BTU









SOLAR HEATING AND COOLING C MCNST AT ION -'CGRAM


MONTHLY REPORT
SITE SUMMARY


SOL AR/2016-79/05


SITF: L.JUDOUN COiUTY
REPORT PERIOD: MAY,1979


SITE/SYSTEM DESCRIPTION:
THE LOUDOUN COUNTY SOLAR ENERGY SYSTEM PROVIDES DOMESTIC HOT WATER PRE-
HEATING FOR THE CHARLFS S. MCNRCE VOCATIONAL TECHNICAL SCHOOL. THE FLAT
PLATE COLLECTOR ARRAY HAS A GROSS AREA OF 1225 SQ FT. SOLAR ENERGY STO-
RAGE CONSISTS CF A 2056 GAL WATER TANK WHICH SERVES AS A PREHEAT TANK
FOR THE HOT WATER SUPPLY. A 1000 GALLON STORAGE WATER HEATER IS SUP-
PLIED FROM THE PREHEAT TANK AND CONTAINS AN ELECTRIC AUXILIARY HEATING
ELEMENT TO PROVIDE SUPPLEMENTAL HEATING AS REQUIRED.
GENERAL SITE DATA:
INCIDENT SOLAR ENERGY 57.856


COLLECTED SOLAR ENERGY
AVFRAGF AMnIENT TEMPERATURE
AVERAGE BUILDING TEMPERATURE
ECSS SOLAR CONVERSION EFFICIENCY
ECSS OPERATING ENERGY
TOTAL SYSTEM OPERATING ENERGY
TOTAL ENERGY CONSUMED


SUBSYSTEM SUMMARY:
LOAD
SOLAR FRACTION
SOLAR ENERGY USED
OPERATING ENERGYY
AUX. THERMAL ENG
AUX. ELECTRIC FUEL
AUX. FOSSIL FUEL
ELECTRICAL SAVINGS
FOSSIL SAVINGS


HCT WATER
5.916
89
10.799
0. 140
1 .364
1.364
N.A.
10.760
N.A.


HEATING
A.
N.A.
N. A.
A.
N.A.
N. .
N.A.
N.A.
N. A.


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


GIGA JOULES


508381 KJ/SQ.M.
19.834 GIGA JOULES
174276 KJ/SQ.M.
18 DEGREES C
N.A. DEGREES C
0.19
0.309 GIGA JrILES
0.449 GIGA JOULFS
21.646 GIGA JOULES

SYSTEM TOTAL
5.916 GIGA JOULES
89 PERCENT
10.799 GIGA JOULES
0.44C GIGA JCULES
1.364 GIGA JOULFS
1.364 GIGA JOULES
N.A. GIGA JOULES
10.451 GIGA JOULES
N.A. GIGA JOULES


SYSTEM PERFORMANCE FACTOR: 0.980
* DN7OTES UNAVAILABLE DATA
@ DENOTES NULL DATA
N.A. DENOTES NOT APPLICAeLE DATA
REFERENCE: USER'S GUIDE TO THE MONTHLY PERFORMANCE REPORT
OF THE NATIONAL SOLAR DATA PROGRAM,FEBRUARY 28,1978,
SOLAR/0004-78/18









SCLAR HEATING AND COOLING DEMONSTRATION PROGRAM
MONTHLY REPORT
ENERGY COLLECTION AND STORAGE SUBSYSTEM (ECSS)


SITE: LOUDOUN COUNTY
REPORT PERIOD: MAY,1979


SOLAR/2016-79/05


DAY
OF
MONTH


1 I
2




8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
SUM
AVG
NBS ID
2-- 2


INCIDENT
SOLAR
ENERGY
MILLION
BTU
2.810
2.660
0. 673
0.380
2.795
2.589
2.535
2.210
2.580
2.293
2. 241
1.379
0. 570
1.298
2.341
2. 800
3.025
1.480
1.788
1.667
0. 534
2.242
0.837
1.502
1.194
1.024
1.280
0.970
1.877
2.343
0.922
54.840
1.769
Q001


N113


AMBIENT
T EMP

DEG- F
58
58
62
57
53
60
68
72
76
76
75
72
66
60
63
61
60
59
64
66
62
67
6R
67
58
53
60
57
64
69
67


64


I-----------
ENERGY
TO
LOADS
MILLION
BTU
0.397
0.668
0.720
C .215
0.003
0.183
0.392
0.593
0.600
0.481
0.494
0.115
0 .008
0.295
0.728
0.553
0.554
0.338
0.158
0.027
0 .204
0.334
0.377
0.385
0.254
0 .009
0.026
0.013
0.306
0.362
0.447
10.236
C.330


0.000


AUX
THERMAL
TO ECSS
MI LLI CN
BTU
C. OOC
0.000
0.000
0. OOC
0.000
0. COC
0.00C
0.000
0. COC
0.000
0.000
0.OOC
0.000
0.COC
0.000
0.000
0. COC
0.000
0.000
0.000
0.000
0. COC
0.OOC
0.000
0.0CC
0.000
0.000
0. OC
0.000
0.COC
0.000
0. OOC


ECSS
OPERATING
ENERGY
MILLION
BTU
0. 009
0.010
0.010
0. 000
0.011
0.010
0.010
0.012
0.011
0.011
0.012
0.007
0.002
0.010
0.012
0.011
0.012
0.010
0.009
0. 010
0.000
0.011
0.011
0.012
0.011
0.010
0.007
0.007
0.012
0.011
0.012
0.293
0.009
Q102


ECSS
ENERGY
REJECTED
MILLION
BTU
N
0
T
A
P
P
L
I
C
A
B
L
E














N. A.
N.A.


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


ECSS SOLAR
CONVERSION
EFFICIENCY


0.141
0.251
1 070
0.565
0.001
0.071
0. 155
0. 268
0.233
0.210
0.220
0.084
0.014
0 .227
0. 311
0. 197
0.183
0.228
0.088
0.016
0.381
0 .149
0.450
0.256
0.213
0. 009
0.021
0.013
0.163
0.154
0.485


0.187
N111










SCLAP HATING A'; CYCLING DEMONSTRATION PROGRAM


MONTHLY REPOPT
COLLECTOR ARRAY PERFORMANCE
SITE: LCUDOnlN COUNTY
P EP'[PT PCoIC : MAY,1979


SCLAR/2016-79/05


DAY
OF
MC'4TH


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
31


54.840
1.76
0001


INCIDENT
TCLAR
ENERGY
MILLION
BTU
2.810
2. 660
0.673
0.380
2.795
2.589
2. 535
2.210
2 .80
2. 293
2.241
1 .?79
0.570
1.298
2.341
2.800
3.025
1.480
1.788
1.667
0. 534
2.242
0. 837
1.502
1.194
1.024
1.280
0. 70
1. 77
2.343
0.922


OPERATIONAL'
INCIDENT
ENERGY
MILLION
BTU
2.386
2.274
0.454
0.000
2.495
2.267
2.224
2.005
2 .339
2.078
2.003
1.006
0.181
1.088
2.083
2 504
2 .685
S.196
1.504
1.405
C.000
1.990
0.646
1.354
0 .962
0.785
0.804
0.702
1.608
2.055
0.698
45.782
1.477


DAYTIME
AMBIENT
TEMP
DEG F


I----------
COLLECTED
SCL AR
ENERGY
MILL ION
BTU
0.983
0.957
C.191
0.000
1.138
0.991
0.911
C. 822
1.043
0.894
0. 844
0.377
C.C62
C. 392
0.889
1. C51
1.123
0.423
0. 567
0.488
C.CCC
C.E57
0.273
C. 599
0.411
0.209
314
0.259
C. 633
C. 26
0.272
18.800
i----------
0. 606
Q10C


COLLFCTOP
ARRAY
EFFICIENCY


0. 350
0.360
0.284
0.000
0.407
0. 383
0.359
0.372
0. 404
0.390
0.376
0.273
0.100
0. 302
0.380
0. 375
0.371
0.286
0.317
0.293
0.000
0. 382
0.327
0.399
0.344
0.204
0.245
0.268
0.337
0. 352
0.295
I ---- ---

0.343
N100


* DFNOTFS UNAVAILABLE DATA.
@ DENOTES NM L DATA.
N.A. DENOTFS NGT APPLICABLE DATA.


64
68
68
59
59
72
79
84
86
88
88
79
69
63
79
68
67
68
70
70
66
73
70
72
62
58
67
67
75
79
71


71


SUM
AVG
NBSID









SOLAR HEATING ANC COOLING DEMONSTRATION PROGRAM


MONTHLY REPORT
STORAGE PERFORMANCE


SOLAR/2016- 79/0 5


SITE: LCUDOUN COUNTY
REPORT PERIOD: MAY,1979


~-----I ----------


DA Y
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
31
SUM
AVG
NBS ID


ENERGY
TO
STORAGE
MILLION
BTU
0.841
0.804
0.159
0.000
1.002
0. 837
0.761
0.685
0.996
0.763
0. 695
0.274
0.019
0.279
0.746
0.800
0.952
0.317
0.454
0.360
0.000
0.722
0.202
0.496
0.325
0.125
0.223
0.174
0.504
C.691
0.187
15.393
0.497
0200


ENERGY
FROM
STORAGE
MILLION
BTU
---- -----~-
C.397
0.668
0.720
C.215
0.003
C.183
C.392
0.593
C.600
0.481
0.494
C. 115
0.008
0.295
C.728
0.553
C. 554
0.338
0.158
C. C27
0.204
C.334
C.377
0.385
C.254
C.009
0.026
C. 013
0.306
C.362
C.447
IC.236
0.330
0,330


-C.246
-0.008


C201 Q202


CHANGE
IN STCRED
ENERGY
MILLION
BTU
0.118
-0. 034
-0.752
-0.218
0.716
0.273
C. C85
-0.226
0.054
0. C20
-0.021
C.C11
-0. C46
-0.082
C. C31
0.085
0.067
-0. 145
0.054
C.132
-0.252
0.066
-C.219
0.011
-0.098
0.047
0.077
C. C55
0.081
0.082
-C.220


116


STORAGE
AVERAGE
TEMP
DEG F

125
127
98
76
90
122
131
126
122
125
127
125
123
120
117
119
125
123
119
126
121
117
112
106
103
102
105
109
114
117
115


DENOTES UNAVAILABLE DATA.
DENOTES NLLL CATA.
.A. DENOTES NOT APPLICABLE DATA.


STORAGE
EFFICIENCY



0.612
0.789
-0.202
1.000
0.717
0.545
0.627
0.535
0.730
0.657
0.679
0.463
-2. 022
0.760
1.016
0.709
0.652
0.608
0.466
0.441
1. 000
0.554
0.779
0.799
0.481
0.452
0.463
0.393
0.769
0.643
1.215


0.649
N108
N108








SOLAR HEATING AND COCLING CEfCNSTRATION DRUGRAM


MONTHLY REPORT
HCT WATER SUBSYSTEM


SOLAR/2016-79/05


SIT : LOUDOUN COUNTY
REPORT PERIOD: MAY,1979


CAY HOT
OF WATER
MON. LOAD
MILLI ON
BTU
1 0.288
2 0.235
3 0.313
4 0.310
5 0.000
6 0.000
7 0.170
8 0.325
9 0.349
10 0.300
11 0.268
12 0.000
13 0.000
14 0.200
15 0.343
16 0.239
17 0.296
18 0.242
19 0.000
20 0.000
21 0.103
22 0.195
23 0.277
24 0.284
25 0.272
26 0.019
27 0.000
28 0.000
29 0.178
30 0.132
31 0.270
SUM 5.608
AVG 0.1811
NBS Q302
I -------


SOLAR
FR.OF
LOAD
PER
CENT
51
79
861
82
0
01
69
90
97
99
1001
0
0
1001
98
97
98
99
0
0
98
98!
98
94
84
56
0
0
59
75
89


89
N300


SOLAR
ENERGY
USED
MILLION
BTU
0.397
0.668
0.720
0.215
0.003
0.183
0.392
0 593
0.6001
0.481
0.4941
0.115
0. 008
0.295
0.728
0.553
0 .554
0.338
0.158
0.027
0. 2C4
0 .334
0.377
0.385
0.2541
0.009
0.0261
0.013
0.306'
0 .3621
0.447
10.2361
0.3301
Q300


OPER
ENERGY
MILLION
BTU
0.007
0. 007
0.006
0.005
0 005
0.00 3
0.008
0.008
0.005,
0. 004
0.004
0.004
C.000
0.00 3
0.004
0.005
0.00 5
0. 004
0.005
0.001
0. C04
0.0051
0.003
0.003
0.0031
0. 003
0.001
0.003
0. 003
0.0061
0.004
0.1331
0.004
Q303
-- --i


AUX
THERMAL
LSED
MILLION
ETU
0.0581
0.041
0.162
0.201
C.171
0.0121
0.000
0.000
0.000
C.000
C .000
0.000
0.000
0.001
0.029
0.012
0.0001
0.000
0.009
0 .000
0.000
0.013
0.004
C.059
0.091
0.136
0.024
0.110
0.095
0.050
0.016
1.292
i -- -- -- -
0.042
Q301


AUX
ELECT
FUEL
MILLION
BTU
0.05E8
0.041
C.162
0.2011
0.171
0.012
0.000
0.COC
0.00CC
0.000
0.COC
0.0001
0.000
0.0011
0.0291
0. C12
0.000
0.000
0. CO
0.0001
0.000
0.0131
0.004
0.0C5
0.0911
0.136
0. C24
0.1101
0.095
0.05C
0.016
1.292
I------
0.042
Q305


AUX
FOSSIL
FUEL
MILLION
BTU


ELECT
ENERGY
SAVINGS
MILLION
BTU


N 0.395
0 0.666
T 0.719
0. 215
A 0.003
P 0.180
P 0.390
L 0.590
I 0.599
C 0.479
A 0.492
B 0.114
L 0.008
E 0.294
0.727
0.550
0.551
0.337
0.155
0.026
0.202
0. 332
0.376
0.385
0.254
0.009'
0. 026
0.013
0.305
0.359
0.447
N.A. 10.199
-~I
N.A. 0.329
Q306 Q311


FOSSIL
ENERGY
SAVINGS
MILLION
BTU
N
0
T
A
P
P
L
I
C
A
B
L
E


N. A.
N.A.
Q313


SUP.
WAT.
TEMP
DEG
F
60
59
61
62
63
63
62
61
62
62
63
74
74
64
61
61
65
65
65
65
65
65
65
65
65
69
66
66
65
66
65


64
N305


HOT
iA T.
TEMP
OFG
F
126
123
121
109
1051
105
120
122
12
124|
124
125
125
119
113
116
122
122
118
1187
114
116
117
114
113
116
117
117
115
118
118


118
N3071


HOT
WATER
USED
GAL
515
418
515
696
0
299
618
653
550
494
0
0
413
757
518
597
465
0
202
444
602
677
661
45
0
0
429
306
588
11464
370
N308


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










SOLAR HEATING AND CCCLING CEMCNSTRATION PROGRAM
MONTHLY REPORT
ENVIRONMENTAL SUMMARY


SOLAR/2016-79/05


SITE: LOUDOUN COUNTY
REPORT PERIOD: MAY,1979


DAY TOTAL DIFFUSE
OF INSOLATION ISOLATION
MONTH
BTU/SQ.FT eTU/SQ.FT
1 2294 N
2 2171 0
3 549 T
4 310
5 2282 A
6 2113 P
7 2069 P
8 1804 L
9 2106 I
10 1872 C
11 1830 A
12 1126 B
13 466 L
14 1060 E
15 1911
16 2286
17 2469
18 1208
19 1.459
20 1.361
21 436
22 1830
23 683
24 1226
25 975
26 836
27 1045
28 791
29 1533
30 1913
31 753
SUM 44768 N.A.
AVG 1444 N.A.
NBS ID 0001


AMBIENT
TEMPERATURE
DEG F
5E
58
62
57
53
6C
68
72
76
76
75
72
66
6C
63
61
6C
59
64
66
62
67
68
67
56
53
60
57
64
69
67


64
N113


DAYTIME
AMBIENT
TEMP
DEG F
64
68
68
59
59
72
79
84
86
88
88
79
69
63
79
68
67
68
70
70
66
73
70
72
62
58
67
67
75
79
71


71


RELATIVE
HUMIDITY
PERCENT


N.4.


WI ND
DIRECTION
DEGREES
288
0
100
308
320
0
157
158
181
173
0
0
0
0
0
320
6
5
39
0
0
0
177
241
0
247
190
0
0
180
0




Nl 15


* DENOTES UNAVA I ABLE DATA.
@ DENOTES NULL DATA.
N.A. DENOTES NOT APPLICABLE DATA.


WIND
SPEED
M. P.H.
3
1
6
2
3
1
3
3
4
2
1
1
0
1
3
3
3
3
3
1
2
1
2
3
2
2
4
1
1
3



2
N 114
?.
N1l4


I --- --- --- -













UNIVERSITY OF FLORIDA
II 1262 09211 111111
3 1262 09052 6921

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