Справочник Пользователя для Mitsubishi Electronics MDS-R

 
 
 

 

 

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The following shows a calculation example for considering heat radiation countermeasures. 
 

When installing four units which have the heating value in the panel of 15W 

Top of panel inside      Fan for agitating

600 

300

600

 

 
 

A = 0.6 x 0.3 + 0.6 x 0.6 x 2 + 0.6 x 0.3 x 2 = 1.26 (m

2

) 

 

(Top face)  (Front/back face)   (Side face) 

*Actually, sections contacting other objects are excluded.  

 

W = 15 x 4 = 60 (W) 

 

1 Temperature standard 

(1) Standard of temperature in panel (around each unit)

   

T 

 55°C

 

(2) External peripheral temperature

               

                     Ta = 0 to 45°C  

(3) Internal temperature rise value                                    

T = T - Ta(MAX) = 10°C 

 

2 C

ooling 

capacity of control panel (W1) 

W1 = U x A x 

T                   T = Internal temperature rise value (=10°C) 

U = 6W/m

2

 

 °C (with internal agitating fan) 

4W/m

2

 

 °C (without internal agitating fan) 

A = Effective heat radiation area (m

2

) 

 

(1) With internal agitating fan      W1 = 6 x 1.26 x 10 = 75.6 (W) > 60 (W) 

Internal fan is  
required. 

(2) Without internal agitating fan  W1 = 4 x 1.26 x 10 = 50.4 (W) < 60 (W) 

 
 

 

 

Measure an actual internal temperature, and install a fan or heat exchanger 
which agitates the heat at the top of the unit if the temperature rise exceeds 
10°C.