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Waterproof modular heat exchanger assembly for an outdoor electrical device

IP.com Disclosure Number: IPCOM000241752D
Publication Date: 2015-May-28
Document File: 2 page(s) / 149K

Publishing Venue

The IP.com Prior Art Database

Related People

Juha Hamari: INVENTOR [+3]

Abstract

This document discloses waterproof modular stacked heat exchanger assembly for an outdoor electrical equipment, eg photovoltaic or wind inverter. The disclosed assembly enables efficient cooling in an outdoor electrical device without the risk of ingress of moisture or dirt inside the enclosure.

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1.Abstract

This document discloses waterproof modular stacked heat exchanger assembly for an outdoor electrical equipment, eg photovoltaic or wind inverter. The disclosed assembly enables efficient cooling in an outdoor electrical device without the risk of ingress of moisture or dirt inside the enclosure.


2.Background

Multiple different cooling methods are available for outdoor inverters, direct cooling, liquid cooling, base-to-air heat exchanger cooling to name few of them. In order to maintain the ingress protection class high, it is common to utilize heat exchangers which can transfer the excess heat through enclosure walls. This enables keeping the components that are not protected against outdoor conditions safely inside the enclosure.

Sometimes it is necessary to install multiple heat exchangers to a device where the heat losses can exceed the cooling power of individual heat exchanger. During assembly of the device, heat exchangers are often mounted separately one by one, which is slow, difficult and expensive. Servicing and reliability of waterproof is hard to carry out since the components must be handled and sealed individually.


3.New solution

In order to create enough cooling power in an outdoor rated electrical device, plurality of heat exchangers, eg. 2-phase thermosyphon air-to-air heat exchangers, can be stacked to the cooling air flow. Individual heat exchangers allow only limited amount of cooling power and in order to keep the power density of the inverter as big as possible, the components must be installed to smaller enclosures. Small enclosure therefore limits the area for the cooling components and air stream. Even though it would be beneficial to get "fresh" cooling air to each individual heat exchanger, the lack of space forces to stack the heat exchangers. With the right design, using right amount of heat exchangers in a stack, it is possible create safety margin in the case of individual heat exchanger malfunction.

Since one part of the heat exchanger will be in contact with outside air (moisture, dust etc) and another part will be placed inside the enclosure, it is crucial that there is reliable sealing between the spaces. Especially when multiple heat exchangers are installed nex...