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Outdoor inverter hybrid cooling

IP.com Disclosure Number: IPCOM000242070D
Publication Date: 2015-Jun-17
Document File: 3 page(s) / 57K

Publishing Venue

The IP.com Prior Art Database

Related People

Juha Hamari: INVENTOR [+5]

Abstract

This document discloses an outdoor inverter cooling arrangement where different cooling media circulations are combined in a unique way. Hybrid cooling arrangement comprising liquid cooling along with air cooling offers efficient cooling for high heat loss components without complicated cooling equipment.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

Page 01 of 3

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1.Abstract

This document discloses an outdoor inverter cooling arrangement where different cooling media circulations are combined in a unique way. Hybrid cooling arrangement comprising liquid cooling along with air cooling offers efficient cooling for high heat loss components without complicated cooling equipment.


2.Background

This design relates to cooling systems of inverters especially having closed enclosures particularly intended for outdoor use. Common design problem in inverters having a closed enclosure is how to remove the heat losses generated in the inverter. Simply blowing outdoor air through the inverter, in other words having an open enclosure, is often not a feasible solution because the heat sources have components that should not be exposed to outdoor environment. Typical solutions in air-cooled inverter constructions utilize a heat sink or a heat exchanger in a way that the outside air flow does not enter the inner parts of the inverter. Another common solution is to use liquid circulation as a means to transfer heat from inside the inverter.


3.New solution

The invention is to combine both cooling principles to form a highly efficient cooling system. Using only liquid cooling circuit to cool down the heat losses has its disadvantages. In the particular case of an inverter, there are high loss components such as semiconductors with an attachment structure or coolant channels enabling a direct contact to the cooling liquid placed inside the inverter. In this case the heat flux steps are:

1. From component to inner heat exchanger

2. From inner heat exchanger to cooling liquid

3. From liquid to outer heat exchanger

4. From outer heat exchanger to ambient air

In this case there has to be a pump to move the liquid and a fan to move the outside air. The benefit of this arrangement is that high amount of heat losses can be removed, and the components in direct liquid contact are well cooled.

It is not practical to have every component in the inverter equipped with liquid cooling channels or a means to attach the component in direct contact to the liquid flow. This means an air-to-liquid heat exchanger has to be placed somewhere inside the inverter to transfer the heat losses not in contact with the liquid flow. The temperature difference between the ambient air temperature and the inside air temperature is therefore dependent on transferring the heat flux in steps:

1. From component with heat losses inside the inverter to air

2. From air to the inner heat exchanger

3. From inner heat exchanger to liquid

4. From liquid to outer heat exchanger

5. From outer heat exchanger to ambient air

© Copyright 2015 ABB Technology Ltd, Affolternstrasse 44, CH-8050 Zurich, Switzerland. All rights reserved.

Page: 1/3 Date: June 17, 2015

Outdoor inverter hybrid cooling



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