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Re: [APD] DIY jobs

Very nice stuff, but expensive. I have though many times in building one. 
The main obstacle I find is the heat interchange device. I can?t image an 
easy an efficient method: perhaps cooling refrigeration fluid and passing 
this through a glass serpentine with the tank water. I also saw drop in 
equipment. I have neither info nor idea.


>From: "S. Hieber" <shieber at yahoo_com>
>Reply-To: aquatic plants digest <aquatic-plants at actwin_com>
>To: aquatic plants digest <aquatic-plants at actwin_com>
>Subject: Re: [APD] DIY jobs
>Date: Wed, 7 Sep 2005 06:47:10 -0700 (PDT)
>Well, you could always add a chiller and then get the
>maximum benefit from the heater all year 'round. ;-)
>--- "Mariano F. Bonfante" <mariano_bonfante at hotmail_com>
> > Adding a rectifier is inexpensive and looks worthwhile as
> > a prevention, but
> > I have neither specific data of effects on fish and
> > plants. The current
> > through the system is 0.5 amp , which is not neglectable.
> >
> > Controlling temperature to a precise point has it
> > drawbacks IME. For
> > example, in winter heater is on and water temperature is
> > 25ºC. In summer
> > water temperature is 29ºC, and heater is off.
> >
> > Once I try with a switching bulb sensing temp close to
> > the heaters,
> > maintaining it constant. What I saw was too much heat in
> > winter, no heating
> > in summer, so constant adjustment was needed. Therefore,
> > I prefer a constant
> > differential temperature system instead, keeping the
> > temperature difference
> > instead of absolute values.
> >
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