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Satellite TV receivers & systems support forums
Fringe Reception General
Cooling the LNB
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<blockquote data-quote="Channel Hopper" data-source="post: 542788" data-attributes="member: 175144"><p>But prior to that the liquid water forms as a result of precipitation of humid air that can no longer hold the mass within it, often as a result of a pressure, or temperature drop.</p><p></p><p></p><p></p><p>If the air can be kept circulating past any cooled component (taking into account the resultant rise in temperature by further cooling) then the chance of water precipitating out as ice is reduced.</p><p></p><p>I do prefer to keep the box of tricks completely isolated from the atmosphere, but hermetically sealing the feed/LNB from water vapour is virtually impossible once cooling elements have been fitted, as other technologies have discovered (optics in astronomy for example) . Adding non replaceable drying compounds into the mix is a no go area owing to their drop off in performance after a couple of weeks, which is why the commercial users in this industry use forced air switching dehydrator systems, often beyond standard atmospheric pressure, to keep the dewpoint and resultant moisture from affecting components, lowering the efficiency of the feed system and/or damage through corrosion.</p><p></p><p><a href="http://www.physicsforums.com/archive/index.php/t-102760.html" target="_blank">http://www.physicsforums.com/archive/index.php/t-102760.html</a></p><p></p><p>There is no need to dismiss a forced air operation in a subzero cooling system, except for the initial costs and constant energy requirement, as it is proven technology. </p><p></p><p><a href="http://www.etitelecom.com/17980.htm" target="_blank">http://www.etitelecom.com/17980.htm</a></p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 542788, member: 175144"] But prior to that the liquid water forms as a result of precipitation of humid air that can no longer hold the mass within it, often as a result of a pressure, or temperature drop. If the air can be kept circulating past any cooled component (taking into account the resultant rise in temperature by further cooling) then the chance of water precipitating out as ice is reduced. I do prefer to keep the box of tricks completely isolated from the atmosphere, but hermetically sealing the feed/LNB from water vapour is virtually impossible once cooling elements have been fitted, as other technologies have discovered (optics in astronomy for example) . Adding non replaceable drying compounds into the mix is a no go area owing to their drop off in performance after a couple of weeks, which is why the commercial users in this industry use forced air switching dehydrator systems, often beyond standard atmospheric pressure, to keep the dewpoint and resultant moisture from affecting components, lowering the efficiency of the feed system and/or damage through corrosion. [url]http://www.physicsforums.com/archive/index.php/t-102760.html[/url] There is no need to dismiss a forced air operation in a subzero cooling system, except for the initial costs and constant energy requirement, as it is proven technology. [url]http://www.etitelecom.com/17980.htm[/url] [/QUOTE]
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Fringe Reception General
Cooling the LNB
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