Daikin VRV III-S Technical Data Manual page 27

5 Functions
5 - 2 Detailed Explanation of Functions
5 - 2 - 7 Power Proportional Distribution
Item
Design precautions
Test run date
Relation between the indicated value of watthour meter and the
total value of calculation results
Relation between the distribution calculated value and the
watthour meter indicated value
NOTE
1 If many watthour meters (more than two) are installed, it is required to make group setting very watthour meter. If the group setting is not made,
the error may become large in the total of each calculation result of the indoor unit corresponding with each watthour meter, though the total of
the indicated value of watthour meter almost conforms to the total of calculation result.
• Pattern 3: Sky Air distribution of electric energy Refer to Item 7 "Design precautions".
(2) Power Proportional Distribution Function
Because the JIS calculation is not based on the Weighing Law, it cannot be used for any official business transaction.
• Power proportional distribution function
The power proportional distribution and determination method is as listed below.
1. Power Proportional Distribution as a calculation standard
2. Calculation of operating load state every indoor unit (1 unit)
(Load every indoor unit to be supposed)
3. Calculation of distribution ratio
4. Electric energy used from distribution calculation of air-conditioner A If the electric energy pulse [1kWh/pulse] inputted for an hour from the formal time is multiplied by the distribution ratio of every indoor unit, the actual
5. Determination of electric energy distribution value in 1-day unit
The calculation result of the power proportional distribution function is made using the original method of Daikin and is not under law.
Collected data are saved in s daily report around midnight.
• Basic functions
- The system is that the rate of use of each indoor unit is calculated and determined from the electric energy used of the outdoor unit.
- For calculation, the power consumption of the outdoor unit is counted as a pules signal, and this value is distributed depending on the load situation
of the indoor unit. (Mentioned later)
Supplement:
Pattern 1: System of connecting three watthour meters to one iPU
If three watthour meters are connected with one iPU, the electric power port is to be specified individually.
Pattern 2: System of using some/many watthour meters with some/many units of iPU
By specifying of power ports, it is also allowed to collectively specify of some/many units.
Example: Of the four iPU, two units are group-specified with one watthour meter, and the remaining two units are group-specified with
each unit individually.
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Power port not specified (Normal)
Standard design without major conditions
Preparation of address table
The total value of calculation results of electric energy distribution is almost the same as the one of the indicated value of watthour meter. Because
the calculation method has a treatment of counting fractions as one, it never becomes smaller than the indicated value of the watthour meter. (1)
There is a case of no conformance between each watthour meter indicated
value and the calculation result of corresponding air-conditioner.
The power consumption of outdoor unit is counted in 1kWh unit. (To be inputted through integrating watthour meter with pulse oscillator)
This value is a standard for determination, therefore, if the watthour meter has a wrong specification, the determined electric energy used is a wrong value.
Every 20 sec., the connected indoor unit operating state is received and collected as a communication data, and the tabulation (summing-up) for
an hour shall be a "temporary load".
In order to determine the power consumption of some air-conditioner A, it is required to determine the temporary load ratio (distribution ratio) of air-conditioner A to
the total temporary load of all the connected air-conditioners. However, the value to be determined here is a ratio and not the power consumption.
Distribution ratio of indoor unit A t =
electric energy used can be determined.
Electric energy used of air-conditioner A (Distribution calculation)
t = Distribution ratio of indoor unit A
u = Number of pulses for 1 hour
With this formula, the electric energy used for an hour of air-conditioner A can be calculated and determined. Then, if the same calculation is made
for all the air-conditioners, the distribution value for an hour of each air-conditioner can be determined.
For 1-day used power distribution value, the calculation result every hour (1 hour) in r is summed up. For end of one day, 12:00 am (mid-night) is fixed.
[Rate calculation] One day to be set in a menu is from 12:00 am to 11:59 pm.
• VRV Systems • Network Solution
Required to allow each of indoor/outdoor units and watthour meter to correspond.
Required to prepare the address table and enter the port No.
Each watthour meter indicated value almost conforms to the
calculation result of corresponding air-conditioner.
Temporary load of air-conditioner A
Sum total of temporary load of all air- conditioners
Power port specified