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Re: Slightly OT: Wine fridge temperature hysteresis?

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On 2017-03-05 18:12, Mike Perkins wrote:
> On 05/03/2017 19:31, Joerg wrote:
>> What is normal for a temperature hysteresis (or "dead band") in a wine
>> fridge? I am seeing 5F and more. It is a Vinotemp VT182.
>
> Most older fridges I have come across have the capillary bulb or sensor
> next to the cooling radiator, such that any hysteresis was reduced.
>

This one is electronic. The sensor does sit next to the cooling 
exchanger but the uC in the electronic sets the hysteresis.


>> Long story short I modified it to become a beer fermenting chamber and
>> added heating capability. Due to it being winter out here it is operated
>> in heat mode right now and the original controller is still used to
>> measure and regulate temps. I didn't hack the micro controller part of
>> it (yet ...).  Currently it is set to 65F. Heat came on at 63F or 64F
>> and now it's topped out at 69F, still heating. Since the heater is wimpy
>> that means it may be always on until it gets warmer outside. No problem,
>> just got me to wonder why the hysteresis is so large on these.
>
> Not so long ago our central heating (bimetal) thermostats would have a
> resistor that would heat the bimetal strip when the thermostat demanded
> heat.  That, in a crude way, reduced the hysteresis.
>
> Look for accelerator in:
>    http://www.flameport.com/electric/central_heating/room_thermostat.cs4
>

Crude but it works. With electronics this is no longer necessary though.

-- 
Regards, Joerg

http://www.analogconsultants.com/

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Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-05 11:31 -0800
  Re: Slightly OT: Wine fridge temperature hysteresis? Adrian Jansen <adrian@qq.vv.net> - 2017-03-06 07:46 +1000
    Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-05 14:43 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Adrian Jansen <adrian@qq.vv.net> - 2017-03-06 11:23 +1000
        Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 07:48 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? dplatt@coop.radagast.org (Dave Platt) - 2017-03-06 11:41 -0800
        Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 12:04 -0800
  Re: Slightly OT: Wine fridge temperature hysteresis? Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-05 14:52 -0800
    Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-05 15:43 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-05 16:15 -0800
        Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 07:49 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? "dcaster@krl.org" <dcaster@krl.org> - 2017-03-05 17:10 -0800
        Re: Slightly OT: Wine fridge temperature hysteresis? amdx <nojunk@knology.net> - 2017-03-06 06:14 -0600
          Re: Slightly OT: Wine fridge temperature hysteresis? makolber@yahoo.com - 2017-03-06 07:18 -0800
          Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 07:53 -0800
    Re: Slightly OT: Wine fridge temperature hysteresis? jurb6006@gmail.com - 2017-03-05 16:26 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-05 16:42 -0800
        Re: Slightly OT: Wine fridge temperature hysteresis? jurb6006@gmail.com - 2017-03-05 20:41 -0800
  Re: Slightly OT: Wine fridge temperature hysteresis? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-03-05 17:53 -0700
    Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 08:02 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 10:19 -0800
  Re: Slightly OT: Wine fridge temperature hysteresis? Mike Perkins <spam@spam.com> - 2017-03-06 02:12 +0000
    Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 08:06 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Mike Perkins <spam@spam.com> - 2017-03-07 00:56 +0000
        Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-07 07:32 -0800
          Re: Slightly OT: Wine fridge temperature hysteresis? makolber@yahoo.com - 2017-03-07 10:57 -0800
            Re: Slightly OT: Wine fridge temperature hysteresis? makolber@yahoo.com - 2017-03-07 10:59 -0800
              Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-07 11:19 -0800

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