Chapter 4 Measurements
Accura 3300E User Guide
Page 80
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Demand Measurement
Demand
Accura 3300E calculates the demand time by multiplying the demand subinterval by the number
of subintervals. Average of demand time is calculated and measured by sliding in demand
subinterval half-cycle interval. Peak demand is the maximum value among demands after the reset.
Peak demand is reset by resetting the maximum/minimum values.
Demand time[minute] = demand subinterval x Number of demand subintervals
Ex) In Korea, when the demand time is 15 minutes, the demand subinterval is 15 minutes, and the
number of demand subintervals is 1.
Fig 4.9 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)
Predicted Demand
Thermal value is calculated by LPF[Low Pass Filter] processing of input value at every moment
during demand subinterval. The predicted demand is calculated by supposing that input for the
remaining demand subinterval remains the same as the thermal value of the present point.
Fig 4.10 Calculation of Predicted Demand
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)
Summary of Contents for ACCURA 3300E
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