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Designing a complete cooling system for 500KW solar inverter

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By understanding and managing the complete cooling loop, we have succeeded in providing our customer a real technical improvement of the system, matching his market economical need in terms of ratio €/W.

Renewable energies applications highlight a well known principle in the industry in terms of market need, in this case called: the Ratio €/W.

Customer requirements

Based on 3 IGBTs with 8400W of heat losses, we have been challenged to build a cost effective cooling loop, ensuring a good working point for the devices (max case temp of 90°C with 35°C of ambient temperature).

Our solution

An efficient cooling loop must be designed by taking care of all components interactions. Starting with the cold plate as it is the first point of contact of the heat load, we have been able to create a custom design providing the right thermal answer: 5,5°K/kW with a maximum thermal resistance difference between the IGBTs positions of 0,2°K/kW as a very homogeneous temperature distribution.

But most important is that we have been able to decrease the pressure drop and water flow to 60kPa@16Liters per min. In that way, the pump system and heat exchanger have been down sized to more cost effective ones.

The heat exchanger that we have recommended use EGW 50/50 and give a performance of 320 W/°C @1000CFM, which easily achieve the new required performances.

Our value

By understanding and managing the complete cooling loop, we have succeeded in providing our customer a real technical improvement of the system, matching his market economical need in terms of ratio €/W.

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