Heaterl Basic Concept for the Selection of the Heater Capacity

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Outer Cover attached Type Space Heater	Outer Cover attached Type Space Heater OUTLINE	200W Compact Type	Terminal Block attached Type	Space Heater Minimum Type

Specification of Sheathed Heater	Space Heater	Basic Concept for the Selection of the Heater Capacity	Themostat PTSC-090C	Themostat ITS-050L

Themostat TS-120S

Basic Concept for the Selection of the Heater Capacity

Important Notice
1) For the smooth circulation by convection there should be 50 mm spacing over the heater itself.
2) Keep the spacing separated mini 10 mm from the side wall and 35 mm from the plastic components.
3) The space heater shall be installed under the components, which are necessary to be protected as far as possible.

1.Surface Area of Panel Board A cm²
The surface area can be calculated by the following formula as shown below.

A	Sole pane board ( free ambient )	A＝2×H×（W＋D）＋W×D
B	Sole panel board with the rear wall	A＝W×（H＋D）＋2×D×H
C	Sided panel board of the connected panel boards ( free ambient )	A＝D×（H＋W）＋2×W×H
D	Sided panel board of the connected panel boards with rear wall	A＝H×（W＋D）＋W×D
E	Central panel board of the connected panel boards	A＝2×W×H＋W×D＋D×H
F	Central panel board of the connected panel boards with rear wall	A＝W×（H＋D）＋D×H

W: Width of the Board, H: Height of the board, D: Depth of the board.

Heater Capasity Selection by the Graph

2.Temperature Difference⊿Ｔ（℃）』
⊿Ｔ＝Tｉ－Tｕ
	Ti	Temperature inside the panel board
	Tu	Temperature outside the panel board

3.Thermal conductivity of the Material ( K )
Steel Plate：5.5W/m²・K
Plastics：3.5W/m²・K

Calculation Formula of Heater Capacity
Necessary Heater Capacity: Q= AX⊿TXK

Example of Calculation

Panel Board: Steel plate W: 600 mm, H: 1600 mm, D: 600mm
Ambient temperature condition:Open air temperature: 5℃, Inside panel board temperature: 15℃
Q=AX⊿TXK=3.24(m2)X10(℃)X5.5(W/m2・K)=178.2
Therefore the heater capacity, 200 W is required for the space heater.

Temperature increase measurement of the space heater was carried out and each temperature increase are shown in the following table.

Temperature increase measurement of the space heater was carried out and each temperature increase are shown in the following table.
Temperature measurement location:
①Central point of the upper surface of the protection cover
② Central point of the side surface of the protection cover
③ Central point of the panel board at the space heater attached
④ Central point of the protection cover at the opposite side to the terminal attached side of the space heater

Temperature measurement results (Temperature Increase)

	Horizontal mounting				Wall mounting(Lateral)				Wall mounting(Longitudinal)
	①	②	③	④	①	②	③	④	①	②	③	④
SHC2/4-1105（2205）	56	11	10	8	12	62	14	7	8	10	9	55
SHC2/4-1110（2210）	64	16	20	10	13	80	22	9	11	10	12	95
SHC2/4-1120（2220）	75	22	22	11	20	93	30	10	15	14	20	140
SHCK2/4-1120(2220)	113	48	34	26	53	115	41	34	48	51	34	152
SSH-1105	50	25	26	26	28	55	22	22	29	23	23	62
SSH-1110	67	30	32	25	35	76	36	23	46	33	31	105
SSH-1120	90	36	41	31	34	82	40	28	48	39	52	165
SSH-2215	70	33	33	30	32	77	33	34	46	34	34	130
SSH-2220	73	33	39	33	36	80	38	32	59	41	46	167

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