Mitsubishi SR-SD1 Specifications download pdf (Page 16)

CHAPTER 3 INSTALLATION

3.2 Designing Conditions of Operation Box

3.2.2 Operation Box Heat Radiation Countermeasures

Please refer to following method for heat radiation countermeasures method.

(1) Average temperature in cabinet : 55°C

(2) Cabinet peripheral temperature : Ta ≤ 0°C~45°C

(3) Internal temperature rise value : ∆T = T − Ta (max) = 10°C

(1) Refer to "3.1 General Specification" for

the heat generated by each unit.

(2) Enclosed cabinet (thin steel plate)

cooling capacity (W1) calculation

equation

W1 = U × A × ∆T

U : 6W/m

× °C

... with internal circulation fan

4W/m

× °C

... without internal circulation fan

A : Effective heat radiation area (m

)

∆T : Internal temperature rise value

(10°C)

(Area where heat can be radiated from

cabinet)

When calculating the effective heat

radiation area, do not include the parts

that contact other objects.

(3) Points of caution for heat radiation

countermeasures when designing

mounting state

∗Consider convection in cabinet

(eliminate heat spots)

∗Collect hot air at suction port in heat

exchanger panel.

(4) Evaluation standards for internal

temperature rise distribution data

∆T (average value) ≤ 10°C

∆Tmax (maximum value) ≤ 15°C

R (inconsistency ∆Tmax − ∆Tmin) ≤ 6°C

(Evaluate existence of heat spots)

Refer to "Section 3.1 General Specifications" for the heating value of each unit.

With the operation box, heat could accumulate at the top of the control unit, so install a circulation fan.

Install a circulation fan in the panel when the following conditions are not satisfied.

Evaluation standards for internal temperature rise distribution data

∆T (average value) ≤ 10°C

∆Tmax (maximum value) ≤ 15°C

Procedures for heat design and verification

Example of heat radiation countermeasures

Calculate total heat generation of each

mounted unit (W)

Comparison of W and W1

W≦W1

Collection of internal temperature rise

distribution data

Mounting design

Improvements

Completion

Selection of heat exchanger

Evaluation

W>W1

△T≦10°C

△T>10°C

Calculate cabinet’s cooling capacity

(W1)

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Mitsubishi SR-SD1 Specifications Page 16

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