AIR-CONDITIONER

The Method Of Model Selection

Air conditioner of Switch Cabinet

The Method of Cooling Capacity Calculation

C (Total Heat Loss) = A (Panel Installation Heat Loss) + B (Input Heat Through Panel Surface)
A
is Heat generated in the electricity and electron circuits within the Panel.

When the power consumption is 500W,

B
is heat input though the surface of the panel while the temperature inside of the panel becomes lower compared to the outside. So, B is correlated with the temperature difference between inside and outside as well as the surface area.
(See the table below)

When the temperature difference between inside and outside is 15℃ and the surface area is
4.6㎡, 55.3Kcal/hr/㎡ x 4.6㎡ = 254Kcal/h

Temperature Differential Conversion Chart

Temperature Differential (℃) (kcal/h/㎡) (BTU/h/㎡)
5 16.7 66.3
10 42.2 167.4
15 55.3 219.4
20 92.2 365.8
25 116.7 463.1
30 142.2 564.2
35 166.9 662.3
C
(Total heat loss) = A + B = 430Kcal/h+254Kcal/h= 684Kcal/h
※ In this Case, Daeyang Model DCA750SM SERIES is the best Choice.

Control panel volume(W x H x D) - 800 x 1600 x 500,
[The method of calculating the surface area control panel(in the case of installing on the factory floor)]
: (0.8m x 1.6m x 2EA) + (1.6m x 0.5m x 2EA) + (0.8m x 0.5m x 1EA) = 4.6㎡

Select Caloric Value

Current and Trancforming Devices
Machinery Installed In Panel Heat Loss-general Standards Remarks
Transformer Rated Capacity
  • - 10KVA Approximately 50%
  • - 100KVA Approximately 20%
  • - 1KVA Approximately 10%
  • - 3KVA Approximately 6%
 · Smaller in size leads to more Heat Loss Rate
Voltage Control Unit Approximately 10% of Rated Capacity · Heat Loss
Heavy Resistor, Fixed, Variable Approximately 1/3 of Rated Capacity -
Constant-Voltage Switch Approximately 10~15% of Rated Capacity · Heat Loss
UPS
  • Rated Capacity 1~5KVA Approximately 35%
  • Rated Capacity 20KVA Approximately 25%
  • · Smaller in size leads to more Heat Loss Rate
  • · Heat Loss is the value in charging the Storage Battery
  • · Full-time Inverter Emergency Type
Switching Regulator Approximately 30~55% of Rated Output
  • · Heat Loss at 100% of Rated Output
  • · The smaller in size leads to the more Heat Loss Rate
Low-Tension Condenser Approximately 0.2% of Rated Output · Rated Capacity KVA.
(100V, 60HZ,1KVA = 256.3㎌)
Amplifying Devices
Machinery Installed In Panel Heat Loss-general Standards Remarks
AC SERVO AMP Rated Capacity
  • - 0.1KW Approximately 50%
  • - 0.5VA Approximately 20%
  • - 1KW Approximately 15%
  • - 3KW Approximately 10%
  • · Heat Loss at 100% Rated Output in an AMP
  • · The smaller in size leads to the more Heat Loss Rate
  • · Built-in Power Supply Type
POWER UNIT Approximately 3~5% of Rated Capacity
  • · Heat Loss at 100% of Rated Output
  • · Built-in Machinery
    Transformer, Rectification unit, Condenser
Inverter Approximately 3~5% of Rated Capacity
  • · Heat Loss at 100% of Rated Output
  • · The smaller in size leads to the more Heat Loss Rate
  • · At the of continuous Rated Output
Computer Device
Machinery Installed In Panel Heat Loss-general Standards Remarks
Factory Computer 1unit : Approximately 100~300W -
CRT 1unit : Approximately 60~130W · Vary according to size(inch)
Flopppy Disc 2unit of 3.5~5inches :20W -
Fixed Disc 10~20 M byte 100 · Power Supply
Wiring Devices
Machinery Installed In Panel Heat Loss-general Standards Remarks
NFB, LEB (NBF)
Rated Capacity
  • - 50A Approximately 15W
  • - 100A Approximately 35W
  • - 225A Approximately 55W
  • - 400A Approximately 85W
(NBF)
NBF+5W Approximately 20W(Leakage From Electronic Circuits)
  • · Heat Loss at 100% of Rated Capacity
  • · Proportionate to the Number of Poies
  • · In case of 3P
  • · Leakage from electronic circults has nothing to do with the number of Poies
  • · The smaller in size leads to the more Heat Loss Rate
Electro-Magnetic Relay Rated Capacity
  • - 4KW Approximately 10W
  • - 7.5KW Approximately 20W
  • - 22KW Approximately 80W
  • - 30KW Approximately 110
  • · Heat Loss at 100% of Rated Capacity
  • · In case of 3P
  • · In case of AC220V
Thermal Relay Rated Capacity
  • - 35A Approximately 4W
  • - 100A Approximately 8W
  • - 150A Approximately 10W
 · When Applying Maximum Static Capacity
Relay Approximately 5W · When Applying Maximum Static Capacity
Computer Devices
Machinery Installed In Panel Heat Loss-general Standards
Compact Relay 1unit : Approximately 1~2W (NFB)
SSC, SSR Using Current X Approximately 1.6W
Thermost at Meter
  • - 48 X 96size Approximately 5W
  • - 96 X 96size Approximately 10W
Others
Machinery Installed In Panel Heat Loss-general Standards
Fan Moter
  • - 90º size Approximately 10W
  • - 120º size Approximately 13W
  • - 150º size Approximately 40W