Accura 2300/2350 User Guide
Chapter 5 Measurement Description
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2011 Rootech Inc. All Rights Reserved
Page 203
Demand Measurement
Demand
Demand time(Tdmd) is determined by the product of “Demand Sub-Interval(Tsub)” and “Number of Sub-
Interval(Nsub)”. A demand value is calculated by processing an average value for a demand time(Tdmd) while
sliding at demand sub-interval time(Tsub). Peak demand is the maximum value among the demand values
after the max/min reset, and it is initialized by max/min reset.
Demand time(Tdmd) [min] = Demand Sub-Interval(Tsub) * Number of Sub-Interval(Nsub)
Ex) In Korea[demand time=15 minute], demand sub-interval is 15-minute and number of sub-interval is 1.
Fig 5.10 Demand Calculation
1:35
Avg 3.0
Avg 4.0
Avg 4.8
Avg 4.3
Avg 2.5
Avg 2.6
1:20
1:25
1:30
1:40
1:45
demand output
3.93
4.37
3.87
(3.0+4.0+4.8)/3
(4.0+4.8+4.3)/3
(4.8+4.3+2.5)/3
time
1:15
3.20
(2.6+3.0+4.0)/3
Demand Sub-Interval [Tsub] (in this case, 5 min)
Number of Sub-Interval [Nsub] (in this case, 3)
Demand time [Tdmd]
source
input
3.47
(4.8+2.6+3.0)/3
(in this case, 15 min)
Prediction Demand
Prediction demand is calculated from the predicted average of on-going demand sub-interval which is
calculated at every second by assuming that the present value is maintained during the remaining time of on-
going demand sub-interval.
Fig 5.11 Prediction Demand Calculation
1:35
Avg 3.0
Avg 4.0
prediction
Avg 4.4
Avg 2.6
1:20
1:25
1:30
demand output
3.80
(3.0+4.0+
4.4
)/3
time
1:15
3.20
(2.6+3.0+4.0)/3
Demand time [Tdmd]
source
input
3.47
(4.8+2.6+3.0)/3
prediction demand output
(in this case, 5*3 min)
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