V-105
C
ONTROL
S
YSTEMS
Demand capacity means the value that parameters of different units like required power and refrigerant
amount are transformed into as a common number to make easy algebraic calculation.
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Measured power
consumption
Through centralized controllers
and interface modules
IDU : Indoor unit
Through SiM units
Operation information
1. Outdoor/Indoor unit
operation
2. Indoor unit fan
operation
3. Stand-by operation
IDU A’s electric power
consumption
Total power
consumption
Demand capacity of IDU A
Total demand capacity of all IDUs
=x
Power distribution result
IDU A
IDU B
IDU C
IDU D
➊
DMS power distribution theory
All the system information of power and indoor/outdoor operation is always monitored by the DMS for power
distribution calculation.
❷
Main capacity
This is determined dynamically with the combination of various refrigerating parameters such as difference
between room and set temperature or evaporator input/output temperature.
These parameters, as a result, determine the refrigerant amount flowing into the indoor unit by controlling
EEV steps.
❸
Fan capacity
This is constant value for indoor unit models. It differs depending on indoor units of different capacity.
When the indoor unit starts Cooling, Heating, Auto and Fan modes, fan capacity values of the indoor units are
always monitored by the DMS. DMS gathers capacity of zero value when they stop operating.
❹
Stand-by capacity
Stand-by capacity is constant for all indoor units regardless of their operations. Since stand-by power is
consumed all the time by PCBs and preheating coils in the outdoor unit, whose value is monitored with the
same fraction which is relatively small compared to main capacity or fan capacity.
Here, Demand capacity = Main capacity + Fan capacity + Stand-by capacity
05-3_control systems(082~141) 3/6/08 14:04 Page 105
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