[time-nuts] Variable Conductance Heat Pipes for temperature control
Joe Gwinn
joegwinn at comcast.net
Sat Jan 23 20:20:41 UTC 2010
At 7:31 PM +0000 1/23/10, time-nuts-request at febo.com wrote:
>Date: Sat, 23 Jan 2010 14:31:40 -0500
>From: Bob Camp <lists at cq.nu>
>Subject: Re: [time-nuts] Variable Conductance Heat Pipes for
> temperature control
>To: Discussion of precise time and frequency measurement
> <time-nuts at febo.com>
>Message-ID: <08528FE8-4EEC-4A8B-AF68-FE045D227AD0 at cq.nu>
>Content-Type: text/plain; charset=us-ascii
>
>Hi
>
>After a quick read, I still don't see much on just how good the
>thermal control can get. Of course I could have missed that page ...
The performance of the Rb oscillator VCHP heatsink is in the book I
left at work. It was pretty good, especially considering that the
heatsink system is wholly passive and electronics-free.
Joe
>Bob
>
>
>On Jan 23, 2010, at 1:33 PM, Joe Gwinn wrote:
>
> > Back in December 2009 I proposed (in "Re: [time-nuts] Cheap
>Rubidium (heatpipe cooling for)") use of heat pipes to stabilize the
>temperature of a Rubidium oscillator within an insulated box.
>Turns out I was anticipated by ~40 years.
>>
>> While standard heat pipes offer near isothermality , they don't
>>offer temperature constancy as the heat flow and/or condenser
>>temperature vary. However, there are hints in the literature that
>>near constant temperature can be achieved, complete with pictures
>>of a Thermacore International product used to control the
>>temperature of a Rb oscillator used in a cell phone tower or the
>>like.
> >
[snip]
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