MEASUREMENT OF WATER HEATER EFFICIENCY. MEASURE EFFECTIVENESS APPLICATION – RETIREMENT VILLAGE...
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Transcript of MEASUREMENT OF WATER HEATER EFFICIENCY. MEASURE EFFECTIVENESS APPLICATION – RETIREMENT VILLAGE...
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MEASUREMENT OFWATER HEATER
EFFICIENCY
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MEASURE EFFECTIVENESS
• APPLICATION – RETIREMENT VILLAGE
• CURRENT SYSTEM (CONTROL)
• CONTROLLER (NEW SYSTEM)
• ACCOUNT FOR USE PATTERNS
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CONSTRAINTS
• NO LOSS OF HOT WATER SERVICE
• TWO WEEKS FOR EXPERIMENT
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COLD WATERSUPPLY
WATERMETER
GASMETER
SOLENOID
TO SPACEHEATING
GAS SUPPLY WATERHEATER
HOT WATERSUPPLY
LARGE
CONSUMPTION
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COLD WATERSUPPLY
WATERMETER
GASMETER
SOLENOID CONTROLLER
TO SPACEHEATING
GAS SUPPLY WATERHEATER
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CONCERNS
• GAS METER MEASURED BOTH HOT WATER AND SPACE HEATING USAGE
• WAS BURNER CONSUMPTION RATE CONSTANT?
• HOW TO ACCOUNT FOR GREATER USAGE ON MONDAY AND FRIDAY?
• HOW TO ACCOUNT FOR STANDBY LOSSES?
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GAS METER MEASURED BOTH HOT WATER AND SPACE HEATING USAGE
MONOTOR TIME THAT GAS SOLENOID IS OPEN.
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COLD WATERSUPPLY
WATERMETER
GASMETER
TIMER
SOLENOID CONTROLLER
TO SPACEHEATING
GAS SUPPLY WATERHEATER
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WAS BURNER CONSUMPTION RATE CONSTANT?
CALIBRATE BURNER GAS CONSUMPTION
• MEASURE HOT WATER GAS CONSUMPTION WITH SPACE HEATING OFF
• REPLICATE
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WEEKLY USAGE
0
100
200
300
400
500
600
700
800
SUNDAY TUESDAY THURSDAY SATURDAY
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HOW TO ACCOUNT FOR GREATER USAGE ON MONDAY AND
FRIDAY?
USE BLOCKING
• INSTALL CONTROLLER• ACTIVATE FIRST WEEK• DEACTIVATE SECOND WEEK
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HOW TO ACCOUNT FOR STANDBY LOSSES?
• USE BLOCKING IN TIME
• EXAMINE EFFECT OF USAGE
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RESULTS
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CONTROLLER OFF
CONTROLLER OFF
DAY GAS WATER GAS/WATERSCF GAL SCF/GAL
1 3515 3020 1.1642 3356 2830 1.1863 3745 3420 1.0954 3437 3050 1.1275 3617 3300 1.0966 3443 3085 1.1167 3260 3005 1.085
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BALANCE CHECK
REASONABLE RESULTS?
CHECK CONSERVATION OF ENERGYEQUATION:
Q
Qout
in
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BALANCE CHECK
S E N S I B L E H E A T O F W A T E R P E R G A L L O N :
Qm C T
Vo u tp
Q C To u t p
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H E A T I N G V A L U E O F F U E L :
Q V H vi n *
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CONTROLLER OFF
CONTROLLER OFF
DAY GAS WATER GAS/WATERSCF GAL SCF/GAL
1 3515 3020 1.1642 3356 2830 1.1863 3745 3420 1.0954 3437 3050 1.1275 3617 3300 1.0966 3443 3085 1.1167 3260 3005 1.085
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CALCULATION
Q SCFBtu
SCFin 1164 1000. *
galBtuQin /1164
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CALCULATION
Qlbm
gal
Btu
lbm FFout
8 32 1 150 55. * * ( )
QBtu
galout 792
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CALCULATION
68%
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CONTROLLER ON
CONTROLLER ON
DAY GAS WATER GAS/WATERSCF GAL SCF/GAL
1 3286 3175 1.0352 3247 3370 0.9643 2907 2860 1.0164 3559 3625 0.9825 2672 2550 1.0486 2867 2865 1.0017 3289 3380 0.973
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CONTROLLER OFF CONTROLLER ON
DAY GAS WATER GAS/WATERDAY GAS WATER GAS/WATERSCF GAL SCF/GAL SCF GAL SCF/GAL
1 3515 3020 1.164 1 3286 3175 1.0352 3356 2830 1.186 2 3247 3370 0.9643 3745 3420 1.095 3 2907 2860 1.0164 3437 3050 1.127 4 3559 3625 0.9825 3617 3300 1.096 5 2672 2550 1.0486 3443 3085 1.116 6 2867 2865 1.0017 3260 3005 1.085 7 3289 3380 0.973
COUNT 7 AVG 1.124 COUNT 7 AVG 1.003CHAV. 1.8 ST.DEV. 0.038 CHAV. 1.8 ST.DEV. 0.032
OUTLIER MAXIMUM 1.390 OUTLIER MAXIMUM 1.226OUTLIER MINIMUM 0.858 OUTLIER MINIMUM 0.779
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t-TEST
OFF ON t-Test: Two-Sample Assuming Equal Variances
GAS/WATERGAS/WATER Variable 1 Variable 2SCF/GAL SCF/GAL Mean 1.124143 1.002586
1.164 1.035 Variance 0.001444 0.0010181.186 0.964 Observations 7 71.095 1.016 Pooled Variance0.0012311.127 0.982 Hypothesized Mean Difference01.096 1.048 df 121.116 1.001 t Stat 6.4813361.085 0.973 P(T<=t) one-tail1.51E-05
t Critical one-tail1.782287P(T<=t) two-tail3.02E-05t Critical two-tail2.178813
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EFFECT OF WATER USAGE
0.8
0.85
0.9
0.95
1
1.05
1.1
1.15
1.2
2000 2500 3000 3500 4000
WATER CONSUMPTION
GA
S C
ON
SU
MP
TIO
N
OFF
ON
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CONCLUSIONS
• CONTROLLER REDUCES GAS CONSUMPTION BY 11%
• DIFFERENCE IS STATISTICALLY SIGNIFICANTLY
• GAS CONSUMPTION PER GALLON OF HOT WATER REDUCES WITH GREATER CONSUMPTION