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...
MEASUREMENT OFWATER HEATER
EFFICIENCY
MEASURE EFFECTIVENESS
• APPLICATION – RETIREMENT VILLAGE
• CURRENT SYSTEM (CONTROL)
• CONTROLLER (NEW SYSTEM)
• ACCOUNT FOR USE PATTERNS
CONSTRAINTS
• NO LOSS OF HOT WATER SERVICE
• TWO WEEKS FOR EXPERIMENT
COLD WATERSUPPLY
WATERMETER
GASMETER
SOLENOID
TO SPACEHEATING
GAS SUPPLY WATERHEATER
HOT WATERSUPPLY
LARGE
CONSUMPTION
COLD WATERSUPPLY
WATERMETER
GASMETER
SOLENOID CONTROLLER
TO SPACEHEATING
GAS SUPPLY WATERHEATER
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?
GAS METER MEASURED BOTH HOT WATER AND SPACE HEATING USAGE
MONOTOR TIME THAT GAS SOLENOID IS OPEN.
COLD WATERSUPPLY
WATERMETER
GASMETER
TIMER
SOLENOID CONTROLLER
TO SPACEHEATING
GAS SUPPLY WATERHEATER
WAS BURNER CONSUMPTION RATE CONSTANT?
CALIBRATE BURNER GAS CONSUMPTION
• MEASURE HOT WATER GAS CONSUMPTION WITH SPACE HEATING OFF
• REPLICATE
WEEKLY USAGE
0
100
200
300
400
500
600
700
800
SUNDAY TUESDAY THURSDAY SATURDAY
HOW TO ACCOUNT FOR GREATER USAGE ON MONDAY AND
FRIDAY?
USE BLOCKING
• INSTALL CONTROLLER• ACTIVATE FIRST WEEK• DEACTIVATE SECOND WEEK
HOW TO ACCOUNT FOR STANDBY LOSSES?
• USE BLOCKING IN TIME
• EXAMINE EFFECT OF USAGE
RESULTS
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
BALANCE CHECK
REASONABLE RESULTS?
CHECK CONSERVATION OF ENERGYEQUATION:
Q
Qout
in
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
H E A T I N G V A L U E O F F U E L :
Q V H vi n *
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
CALCULATION
Q SCFBtu
SCFin 1164 1000. *
galBtuQin /1164
CALCULATION
Qlbm
gal
Btu
lbm FFout
8 32 1 150 55. * * ( )
QBtu
galout 792
CALCULATION
68%
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
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
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
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
CONCLUSIONS
• CONTROLLER REDUCES GAS CONSUMPTION BY 11%
• DIFFERENCE IS STATISTICALLY SIGNIFICANTLY
• GAS CONSUMPTION PER GALLON OF HOT WATER REDUCES WITH GREATER CONSUMPTION