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Monthly performance report

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Material Information

Title:
Monthly performance report Stewart-Teele-Mitchell
Uncontrolled:
Stewart-Teele-Mitchell
Physical Description:
v. : ill. ; 28 cm.
Language:
English
Creator:
United States -- Dept. of Energy
Publisher:
Dept. of Energy
Place of Publication:
Washington
Publication Date:

Subjects

Subjects / Keywords:
Solar energy -- New York (State) -- Malta   ( lcsh )
Solar houses -- New York (State) -- Malta   ( lcsh )
Genre:
federal government publication   ( marcgt )
non-fiction   ( marcgt )

Notes

General Note:
National solar data program.
General Note:
Monthly Catalog Number: gp 80007734
General Note:
National solar heating and cooling demonstration program.
General Note:
"SOLAR/1018-78/11" ; "SOLAR/1018-79/01" ; "SOLAR/1018-79/02" ; "SOLAR/1018-79/05."

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 027034853
oclc - 05895655
System ID:
AA00013862:00001

MISSING IMAGE

Material Information

Title:
Monthly performance report Stewart-Teele-Mitchell
Uncontrolled:
Stewart-Teele-Mitchell
Physical Description:
v. : ill. ; 28 cm.
Language:
English
Creator:
United States -- Dept. of Energy
Publisher:
Dept. of Energy
Place of Publication:
Washington
Publication Date:

Subjects

Subjects / Keywords:
Solar energy -- New York (State) -- Malta   ( lcsh )
Solar houses -- New York (State) -- Malta   ( lcsh )
Genre:
federal government publication   ( marcgt )
non-fiction   ( marcgt )

Notes

General Note:
National solar data program.
General Note:
Monthly Catalog Number: gp 80007734
General Note:
National solar heating and cooling demonstration program.
General Note:
"SOLAR/1018-78/11" ; "SOLAR/1018-79/01" ; "SOLAR/1018-79/02" ; "SOLAR/1018-79/05."

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 027034853
oclc - 05895655
System ID:
AA00013862:00001

Table of Contents
    Front Cover
        Front Cover 1
        Front Cover 2
    Main body
        Page 1
        Page 2
        Page 3
        Page 4
        Page 5
        Page 6
        Page 7
        Page 8
        Page 9
        Page 10
        Page 11
        Page 12
        Page 13
        Page 14
    Back Cover
        Back Cover 1
        Back Cover 2
Full Text
LI)


SOLAR/1018-79/02

Monthly

Performance

Report



STEWART-TEELE-MITCHELL
FEBRUARY 1979


U.S. Department of Energy


National Solar Heating and
Cooling Demonstration Program


National Solar Data Program


I


--


/


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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


STEWART-TEELE-MITCHELL

FEBRUARY 1979

I. SYSTEM DESCRIPTION

The Stewart-Teele-Mitchell site is a single-family residence in Malta, New York.
The home has approximately 1900 square feet of conditioned space. Solar
energy is used for space heating the home and preheating domestic hot water
(DHW). The solar energy system has an array of flat-plate collectors with a
gross area of 432 square feet. The array faces south at an angle of 45
degrees to the horizontal. A glycol/water solution is the transfer medium
that delivers solar energy from the collector array to a heat exchanger.
Water is then used as the transfer medium that delivers solar energy from
the heat exchanger to storage, and to the space heating and DHW loads. Solar
energy is stored in the basement in a 1000-gallon insulated tank. Preheated
city water is stored in a 75-gallon preheat tank and supplied, on demand, to
a conventional 40-gallon DHW tank. When solar energy is insufficient to
satisfy the space heating load, an oil-fired furnace provides auxiliary
energy for space heating. Similarly, an electrical heating element in the
DHW tank provides auxiliary energy for water heating. The system, shown
schematically in Figure 1, has five modes of solar operation.

Mode 1 Collector-to-Storage: This mode activates when the collector tempera-
ture exceeds the storage temperature by 20F and terminates when a temperature
difference of 30F is reached. Solar energy is transferred through the heat
exchanger that transmits energy from the solar collection loop to the storage
loop. Collector loop pump P1 and storage loop pump P2 are operating.

Mode 2 Collector-to-Space Heating: This mode activates when mode 1 condi-
tions are satisfied and there is a demand for space heating. The collected
solar energy bypasses storage and flows directly to the solar heating coil in
the air-handling system. Mode diversion valve V2 is open.

Mode 3 Storage-to-Space Heating: This mode activates when there is a
demand for space heating, the temperature at the top of the storage tank
exceeds 100F, and solar energy from the collector is not available. Pump P3
is operating.

Mode 4 Storage-to-DHW Tank: This mode activates when the temperature at
the top of the storage tank exceeds the preheat tank water temperature by
100F. Pump P4 is operating.

Mode 5 Summer Mode, Collector-to-Vent: This mode activates when the col-
lector array output fluid temperature exceeds 2200F. The collected solar
energy is rejected through a fintube heat exchanger located outside the
dwelling. Valve V1 directs the collector loop flow through a purge unit.





























DOMESTIC
MOT
WATER


Figure 1. STEWART-TEELE-MITCHELL SOLAR ENERGY SYSTEM SCHEMATIC







II. PERFORMANCE EVALUATION


INTRODUCTION

The solar energy system operated continuously during February. Solar energy
satisfied 13 percent of the DHW requirements and 13 percent of the space
heating requirements. The solar energy system provided fossil fuel energy
savings of 2.2 million Btu at an electrical energy expense of 0.2 million Btu.
The collector loop heat transfer fluid appears to have frozen during the
period from February 10 through February 15 when temperatures were recorded
as low as -19F. Data was lost for three days in February.


WEATHER CONDITIONS

During the month, total incident solar energy on the collector array was
18.0 million Btu for a daily average of 1485 Btu per square foot. This was
above the estimated average daily solar radiation for this geographical area
during February of 1131 Btu per square foot for a south-facing plane with a
tilt of 45 degrees to the horizontal. The average ambient temperature during
February was 130F as compared with the long-term average for February of 240F.
The number of heating degree-days for the month (based on a 650F reference)
was 1308, as compared with the long-term average of 1162.


THERMAL PERFORMANCE

System During February the solar energy system performed somewhat poorer
than expected. The expected performance was determined from a modified
f-chart analysis using measured weather and subsystem loads as inputs. Solar
energy collected was 3.5 million Btu versus an estimated 6.1 million Btu.
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 1.6 mil-
lion Btu. System total solar fraction was 13 percent versus an estimated 57
percent.

Collector The total incident solar radiation on the collector array for the
month of February was 18.0 million Btu. During the period the collector loop
was operating, the total insolation amounted to 13.6 million Btu. The total
collected solar energy for the month of February was 3.5 million Btu, result-
ing in a collector array efficiency of 19 percent, based on total incident
insolation. Solar energy delivered from the collector array to storage was
3.0 million Btu, while solar energy delivered from the collector array directly
to the loads amounted to 0.21 million Btu. Energy loss during transfer from
the collector array to storage and loads was 0.27 million Btu. This loss
represented 8 percent of the energy collected. Operating energy required by
the collector loop was 0.13 million Btu.

Storage Solar energy delivered to storage was 3.0 million Btu and there
was no auxiliary energy contribution to storage. There were 1.8 million Btu
delivered from storage to the DHW and space heating subsystems. Energy loss
from storage was 1.0 million Btu. This loss represented 33 percent of the








energy delivere-d to storage. The storage efficiency was 67 percent: This is
calculated as the ratio of the sum of the energy removed from storage and the
chinq in sto',.I energy, to the energy delivered to storage. The average
s'oirait, tLcl,''irIAture for the month was 880F.

DH[IJ Lu~J The DHW subsystem consumed 0.33 million Btu of solar energy and
0.-.7 rilliujn Btu of auxiliary electrical energy to satisfy a hot water load of
0.1'2 million Btu. The solar fraction of this load was 13 percent. Losses
fro: the D[HW subsystem were 0.28 million Btu. The DHW subsystem consumed a
total of 0.061 million Btu of operating energy, resulting in an electrical
,Ficr-';y savings of 0.016 million Btu. A daily average of 27 gallons of DHW
was .onsiiied at an average temperature of 1260F delivered from the tank.

SJpaLCe edtinyj Load The space heating subsystem consumed 1.3 million Btu of
slar ener~yi and 8.6 million Btu of auxiliary thermal energy (equivalent to
14.3 auxiliary fossil fuel energy) to satisfy a space heating load of 9.9
million Btu. The solar fraction of this load was 13 percent. The space
heating subsystem consur.ied a total of 0.62 million Btu of operating energy,
resulting in an electrical energy expense of 0.058 million Btu.


OBSERVATIONS

During the period from February 10 through February 15, the heat transfer
fluid in the collector/heat exchanger loop of the energy collection and storage
subsystem (ECCS) appeared to freeze during the night. Temperatures during this
period reached nighttime lows between -120F and -190F. The days were sunny
with daytime temperatures about 6 to 70F. The scan data shows that the control
system normally activated the collector loop pump (EP100), but no flow ensued
with the collector inlet temperature (T100) registering 32F, and the collector
outlet temperature (T150) registering as much as 244F. The temperature at
the input to the collector loop heat exchanger (T151) gradually increased to a
high of 212"F with the heat exchanger/storage loop pump (EP200) operating
normally. The data indicates that a small amount of solar energy was delivered
to storage. On February 9 and 10, the heat transfer fluid thawed after approxi-
mately three hours of intense insolation, and the flow in the collector/heat
exchanger loop was almost normal.

On February 16, the ECSS control system malfunctioned by failing to activate
the heat exchanger/storage loop pump (EP200) when the collector/heat
exchanger loop was operating.

During February, the measured maximum flow in the collector loop declined by
approximately 0.5 gallons per minute since the apparent freezing of the heat
transport fluid.

Despite the problems discussed above, the solar energy system registered its
best performance of the winter season.


ENERGY ",VINGS

The solar energy system provided a fossil fuel energy savings of 2.2 million Btu
at an eApense of 0.17 million Btu of electrical energy. The DHW subsystem








provided an electrical energy savings of 0.018 million Btu; the space heating
subsystem contributed a fossil fuel energy savings of 2.2 million Btu at an
electrical energy expense of 0.06 million Btu.


III. ACTION STATUS

There has been no change in the action status since January. Action on the
recommended instrumentation modification and the resolution of sensor
anomalies has not been scheduled by Boeing.









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qCL P/1119-70/32


---------I-----------
cTroD1-c ( CTPQIC Ir
AVcrP AhF IFFirI r v
T t:MO|
n)pr, r= (

~---------- I------
'1 1 f00


04 | ,- 04
94 -.
7p 1I," 1



Q4 7 I



9- 11 !
on 3.'43 i







I I
02 d -itlla (
Q2 I 10.73
I +*








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





1 1.n 1


--------- --------! -

---^-- -------------
88 ^.673
MIO






SOLAR HFATING AND CnrPLItG DFMOfNSTATTON 0DD00AM
MOMTHLVY DooDT
HOT WATFD SIJR

SPL* fA/! ( I-q70/07


SITE: STEWART-TFELF-M!TCWCLL
REPORT PERIOD: FF RRPUAOY, oQ'


DAY
OF
MON.



2
4
5
6
7
0
aI
10
11
12
13
14
16
17
18
I 0
19
20
21
22
23
24
2 r
26
27
2P
AV(
NBS


-_I
HOT
WATER
LOAD
MILLION
BTU
0. 17
0.026
0.0281
0.3 0
S.029
0.0161
0.323
0 093r
0.012
3.330I
0.003
0.014


0.031
0.313







0 #
03.301
0.016
*
*1
0.300




0300
0.038
0.023'
*
0.313
9.02?
0.0311
3.3 161
0.516
3.312
030?


-~I
SOLAR
FNFRrV
LI"Fr)
'MILL ION
9TU


SOLAQ
tp.r>Fn
LOAn
PFP
CrF NT

3
13
12
1
22
16
13
0
11


15
11
9
q
0O
*
*
6
5
6
6
*
18
1'<
24
17


-------I
VPFP

MILLION
PTU


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


13
N300


.332
0.12
0300


0.003'
0. 031
0.003
0.003
0,002
0.0041
0 .002
0.001.
0. 00 2
0.0005
0.003'
0,0ocr
0.004'
0.002
0.0011
*1
*1
0. C02
0. 000
0.004'
0.0001
*
0.001'
0.0 061
0.003


0t'6I11

Q~03


AllY
THFPMAL
USED
MILLIr'
RTIJ
0. 017

0.010
0. 07
0.017
0.016'
0.01"'
0.010
0. 031'
6,0174

0.011
O.OI2l'l



0.024
0.022
*



0.0i0
O.O(o'


0.0324
0.022
*


0.015
0.0301

0.469


0301


FLrT
I FIJC L
MILLTnN
RTU



C.019
O.01l
0 0176

0.017
3.017
0.016
0.0t4'

.0174


0.012
0.020'
0.n11
*
*1
.0 0 I
0 .006
0.024
0.022
*
n. n 1o
0r.r10
0.030
0 P10
0.468

03C17
l030s


-------- I
A-IX
Pr4 CTL I
FUrL
MILLION I
PTU
-------I


0.009
0.02C
0.027
0. OC
0.021,
0.024
0.003
0.013
0.014
0.017
0.00
0.025
0.002
0.015
0.017
0.013
*
*
SOCC7
0.000
0.020
0.000
*
0.001
0.00
0.017
0.025


FLFCT F1 SS!I
FNhFD q c N E r
SAVTNS SAVINr Z
MTLL I N MTLL T n
RTU ~RTU


0,3n0
-0.003
----- -- --- --
n:006
-3 003
-3. 3 |
-0 .000
0.0co
11 i
-0.002

0. 0
-9.003




-'1. 02
0.000
0.001
0.300
-0.0011
3.001
-9.3201
-'?*)


0.301
0311


T

4,
D
LI
T
C
A
L
P


-------- I
N. A.


'313
fl3 .
o3!3~


TlFMD1
c I
FGl I

501
921

471
5 1
541












- -- I
541
491
551
621
c71
541
*
S1
so
58
49
40
*
43
51
451
i3
-1
521
M305l


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

)Fr, 1 LCP
CnT t l T j







IFG I


1271 i7
171 41,


1 2 I 1 4

12" 1

12-1 -
1 271 7






12 0
12r1 I7

131
12* 191










-44
-12 7
N*I *071N
131 -- I

1311 34
-I 750

l?26t1 27
307 N303 (
--_-_ -----~(


* r)ENPOTS IJNAVATLARLt nATA.
A DENOTES NULL DATA.
N.A. DENOTES NOT APPLICABLE nATA.


I




I

1
I


I



I
-I
N.&.
0306 I


1








MunfJT4LV pFDo Q
So rF HFATIMr, f IJRrYCv


STTE: STFWART-TFELF-MTTCHFLL
RFOORT PERIOn: FBPIAJPY, 1970


OFAV
N.p



1
12
3
4
5
6
7
I9
10
11
12
13
14
15
16
17

20
21
22
23
24
25
26
27
28
----

AV(
NR
A VIP,


So&CE
HFATINr:
LOAD
MILLION
RT'J
i---------
0.32P
0.3???72
0.134
0.287
0.437
0.32'
0. 40"
0.3
0.332
0.44?
0.5?2
0.400
0.527
0.40
0.400'
0.457
0.43?
*

0 2A2
0.2n2
0.34q
0.140
0.312
*
0. 2 A
0.312
0.267
0.12'
--0------

0. 12?
0402


S'DLAP SnLAT
CDo,F EN FRQV
LOAn USED
OCT MILLION
BTU
----- --------
i0 0.0 6
11 o.0 6
;q 0.073
47" 0.1?5
20 0.08(-
40 0.127
n 0.000
21 0.372
341 0.114
11 0.050
7 0.037
3 0.013
1 0.003
1 n.0 n
11 0.044
11 0.048
1? 0.051
*
*
1R 0.050
2A 0.091
151 0.023
21 0.066
*
0 0.000
01 0.000
0 "n.000
271 0.046
1.311
13 0.'47
-400- 0400
1--- I --------


rloFO
r N FP V>Y

MILLT 1`
RTU

0.019
0.027
0.011
0.021
0.027
0 .12"'
0.027
0.024
0.0?2
0.n?6
0. 0?3
0.026
0.0?9
0.03?
0. 0?7
0.n26
0.020
*

0.nl01
0.022
0 .n00
0.021
*
0 01~
0.010
0.015
0.1010
0.62?
0.022
0403


AllX
CLTtr
FIrFL
MILL ITP
PTIJ
M
T

A
p
D
L
I
r
A
9
L
I:


AllY
THFRMAL
,JSEn
MTLLTION
FPTU

0. ?R6

0.104
0. 42 -
0.' o4

0. 2o


0.477
0.2724


0 781
*

0.247
0.2r7
0.126
0. 246

0.212;6

0.07P




040 1


r0';- TL
FIro:L
F IcL
I L L 7
MI LLT '


)l 47
0.101
?.2 ?
0. %
n.P24
S4R P
72

0 ,54
0.800
0,874
r,0 9
0.971
0.698?
0 .63'
*
S*

0.428
0.710
0.411
*
0.427
0.520
0.445
0.12Q
)-----------
14.254
0.50
0410


I Ftl r F
NCot r,v
RAVINrg
IHILLTON
RTIj
--------1
-*1 031
-0. 02
I 0) I
-3"C !

-3n.004
-1. 00n
-I DO o 1l


-0.0 103





-0.0001
-0. 0001


-0.0101

-0. 00?2
-O.0 I0
-0.0031
-0.nO 1O
SI*
0.000
0 0001

/-----I---


I 0415 I


* DENOTES UNAVAILARLF nATA.
2 DENOTES NULL OATA.
N.A. DENOTFS NOT APPLICABLE rATA.


I N
N.A.
N.A.
- - -


';nLAP MF^TINn AD) CntnLi1r ncMre' TPATI, oD-DoNtR


CnZCe!L q1 I-M1 a n I

Savepv: i'evo lrus
AV I k! -1
MILL t t'r ': r- np e I
ntt I F I F
_____-_1---- _----_


0 1 7*t 144


o 11 t 41
n. 111 o -

0.30, I ia -I1

n.I10 r,7, -41
0.O174 631 21
0.0q1 6?1 1
0. R41 6 1( -o
*1 *l
-)Q 63 11
0.001 60 301
0.1 P1 6 1 36*1
0. 0 I1 631 11
O.n^0e 641 11
0.3901 43 21
-I
O--I ----- ----I
2.1R41 -!
21 4 1 3

0.O 7 6?2 131
041'7 N4061M 113
--~--~--I i-- -







rnLAP HEATING AND C(rLIN~, DrF 4nhlqsTTION PP nR :A
crNV1M ~\TD Vft0 ov


SITF: RTeWAPT-TCaLP-MTTCHCLL
PE03PT ppoin): FPRQ11APY,1070

DAY TrTLL DIFFURE AMPIFM NT FAV' TMF RFL TIV ~
OF I NSnLA'T~CT INSLATTPN Te MppAPATIRF AMPT ~r MI ITTY
M-NTH TFO u
RTII/S.cn, T p TI1f(n.r T I OFr. F i nr c OFaru "
------- ----------- ---------- ----------- 7-6 ------
1 1 706 N 16 1 1 N
2 16 0 n I 21 n
206r T I 70 T
4 1622 Y1 1 ?1
1137 A 16 i
6 2124 P P I 0
" 3-A o 6 1D A O
SI7l? L 16 L
a 1995 1 a 1 ]
0 1967 C -1
1I 27 >? 2 -7 I1 A,
12 1 1745 a q
13 ?032 L 6 L
14 2001 -4 PI
15 21R7 2 7
16 1042 I I
17 I 240O o -
Io I I I
20 1646 1. *
21 559 ?" 5
7 05? 36 I *
73 355 31 1 *
4 1 *
?5 664 3I I *
?A 220 30 31
77 17 *
2A 254Q 33 1 4'
-------i--------- ----------- --------------------------
--------- ---------------
V-- 14-5 N.A.- 13 15 M.A. I
S I 15

B-- T- ------ -- -------- 3 --------I----- N-----

* nEgoTcE' UNIMAATLARLF nATA.
@ DENOTF: NULL rATA,
N.A. r)FNOTiS NOT APPLICARLF nATA.



-------------------------(
VTND 1 WIM I
rTPrFCTI MN I :p n
I I
nFGPFPS I Pu.D. I
------------ -------------I
-I
N J M I
n I n I
S I T
L L
& I A I
D I D 1
P 0 I
L L I
I r
A I I
L L
F F











------------ -------------
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------------ -------------
N.4A.I N. I
NU 11
- - - - I -- -











UNIVERSITY OF FLORIDA
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3 1262 09052 5485