264
1.5 Explanations of Power Proportional Distribution
Power Proportional Distribution (P.P.D.)
1.5.2 Count Accuracy
(1) Cause of error
(System example)
<Case of arising error>
���
W1 + W2
Count conclusive total for indoor unit #1~#8
Refer to the “REASON”
���
W1
≠
Count conclusive total for indoor unit #1~#5
W2
≠
Count conclusive total for indoor unit #6~#8
Refer to the next page
���
W1 + W2
Count conclusive total for indoor unit #1~#8* : The reason to get and the error size
REASON
iPU counts every one hour’s power consumption.
Though fraction in case of computation occurs at this time, it is computed after leaving off a 1-W figure to avoid the risk
for the owners. As a result, the error by the leaving-off occurs by 0.5W/ hour in average value as per each indoor unit.
(Calculation example)
(1) Count for errors in 8-day
Tenant A + B : 0.5 (Wh) × 24 hr × 8 days × 5 units = + 0.48 kWh
Tenant C : 0.5 (Wh) × 24 hr × 8 days × 3 units = + 0.288 kWh
total = + 0.768 kWh
(2) Assuming that the reads on watthour meters are as follows:
W1: read on watthour meter = 490 kWh
W2: read on watthour meter = 200 kWh
total
= 690 kWh
(3) Finally it is concluded as total error = 0.768 / 690 × 100 = 0.11%
���
W1
≠
Count conclusive total for indoor unit #1~#5 :
W2
≠
Count conclusive total for indoor unit #6~#8 :
iPU counts the power consumption as the following conditions (1)~(6) for the standards. So, the gap to be raised from
these conditions may cause the error. Since these errors vary depending on the surrounded situations, the worst error
value can’t be drawn out from the computing.
(1) Combination rate of indoor units connected to an outdoor unit
(100%)
(2) Outdoor temperature
( 35°C)
(3) Indoor unit’s suction air temperature
( 19°C)
(4) Piping length
( 5m)
(5) Level difference
( 0m)
(6) Pipe diameter
(
φ
22.2)
Watthour meter
(with output)
Power supply
3 phase
#1
#2
#3
#4
#5
#6
#: Indoor unit's address
#7
#8
W2
W1
Outdoor unit
Tenant A
Tenant B
Tenant C
Legend
: Read on wattmeter
Power supply
single phase
iPU
To other iPU
PC
HUB
Содержание D-BACS
Страница 1: ...ED 72 721 Preliminary Daikin Buildings Air conditioning Control System D BACS DESIGN GUIDE ...
Страница 17: ...xvi 1 5 Open Network Glossary Introduction ...
Страница 41: ...24 Outline of D BACS System ...
Страница 74: ...57 Remote Controllers HRV Wired remote controller BRC301B61 VAM ...
Страница 88: ...3 6 Wired Remote Controller with Weekly Schedule Timer BRC1D61 71 Remote Controllers 3P107422 3D ...
Страница 102: ...5 2 Wireless Remote Controller BRC4C 7C 7E 85 Remote Controllers 5 2 Wireless Remote Controller BRC4C 7C 7E ...
Страница 103: ...86 5 3 Simplified Remote Controller BRC2C51 BRC2A51 Remote Controllers 5 3 Simplified Remote Controller BRC2C51 BRC2A51 ...
Страница 107: ...90 5 4 HRV BRC301B61 Remote Controllers ...
Страница 142: ...1 2 System Configuration 125 Control Devices 1 2 System Configuration System Outline ...
Страница 181: ...164 3 8 Error Diagnosing Function Control Devices ...
Страница 215: ...198 3 8 Wiring Example intelligent Manager ...
Страница 235: ...218 Interface for Use in BACnet ...
Страница 249: ...232 7 1 Node Objects Interface for use in LONWORKS 7 Object Details 7 1 Node Objects 7 2 DIII NET Common Objects ...
Страница 253: ...236 Interface for use in LONWORKS 10 Reference Materials Error Code Conversion Table ...
Страница 268: ...251 Interface for use in LONWORKS 13 Workflow ...
Страница 285: ...268 1 6 Notes Power Proportional Distribution P P D ...
Страница 319: ...302 1 5 Dio Unit DEC102A51 Adaptor 1 5 2 Part Names and Functions 1 Appearance Dio Unit DEC102A51 ...
Страница 329: ...312 1 6 Di Unit DEC101A51 Adaptor 1 6 2 Part Names and Functions 1 Appearance Di Unit DEC101A51 ...