Page top

Building Automation


Industrial Automation


Power Automation & Safety

Bangladesh Distributor

Lead Contents

FAQ01858 of Power Supplies FAQ

FAQ No. FAQ01858

Primary Contents

Question

What is the best way to estimate the amount of heat produced by the Power Supply?

Answer



The Power Supply's internal loss becomes heat energy (internal loss = heat produced).

Equations:

Internal loss (W)

= Effective input power - Output power

= Output power/Efficiency - Output power

Note:Reducing the load rate is an effective way to reduce the amount of heat produced.

Example Calculating the Heat Produced by a 100-W S82K Switch Mode Power Supply

Power rate: 80%

Output power: 24 V × 4.2 A = 100.8 W

Effective input power: Output power/Efficiency = 100.8 W/80% = 126 W

Internal loss (heat produced): 126 W - 100.8 W = 25.2 W

To convert the internal loss to calories:

By Joule's law, 1 W = 0.24 cal/s,

so 25.2 W = 25.2 × 0.24 cal/s = 6.05 cal/s

Recommended Products

S8VS

New Models with Indication Monitor and Simple Functions for Easy System Commissioning

ZJ-FA20

High-speed, High cost performance Ionization

S8JX

Flexible Selection of Reliability and Ease of Operation with the S8JX. New Models with Harmonic Current Suppression for a Broader Lineup.

Other Power Supplies FAQ