How to determine the right heat sink? - CR4 Discussion Thread

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Billy@Delta Participant Join Date: Nov 2006 Location: Lugano (Switzerland) Posts: 4	How to determine the right heat sink? 11/17/2006 12:59 AM
	Introduction: I have 10 electric furnace for heat treatments: I'm renewing the controll system, so to make them central controlled. The power of the furnaces varie from 20 kW - 65 kW / 400 VAC. To controll the inductive heating elements I chose Solid state relays (Magnecraft W66125DSX-1) they handle 125 A / 600 VAC. Question: I wanted to install Fluid cooled heat sinks since I already have a 22°c cilled water supply to the furnace it self. The Solid state specs ask for a heat sink with (0.14 [K/W] or [°C/W] with fan) and the Fisher fluid coolers are expressed in Q[W] Various ratings ranging from 1200 - 2200 Q[W] Which rating is right for my application? __________________ I don't know much, but that what I know, I will be glad to tell you, my solutions are as simple as I am.
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	Pathfinder Tags: heat calculation heat sink dimensions

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tom Power-User Join Date: Apr 2005 Location: Scotland Posts: 164 Good Answers: 8	#1 Re: How to determine the right heat sink? 11/18/2006 6:51 AM
	Can't offer any help with the heat sink problem but you might also have a problem with electrical noise produced by the solid state relays. SSRs are extremely noisy in operation and far exceed the EU EMC directive 2004/108/EC. To comply with the directive you will probably have to install quite substantial EMC filters on each phase or risk a visit from the compliance people. We have been working on the EMC problem for several years and now have a 240V SSR which is certified EMC compliant at 80A, (patent applied for). A 530V 80A version should be in test at the end of the year. One unusual side-effect of our design is the ability to operate the SSRs in parallel which should, in theory, allow unlimited load switching from a single 3 - 32Vdc control signal. This would allow you to spread the heat sink area by using several SSRs connected in parallel. Our new SSR also operates very well with inductive loads and has been used to power the transformer on a high-power research sonar transmitter. As you might expect with a new design it will also be RoHS compliant.
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You might be interested in: Furnace Controllers, Fluid Transfer Pump Systems, Supercritical Fluid Extraction Systems

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