Hi,

I'm using a floor heating, working with low temperature water (I've never
seen more than 25 =B0C in the water pipes) in my house.
Before the concrete was poured I was thinking on a temperature control for
the water based on sensors in the floor.
Before the sensor were ready, concrete was already pured... Wat was in my
mind at the time was a maxim/dallas 1wire redundant net of sensor (like
DS18B20), but this were never realized.

My experience with floor heating, is that you don't need lot of control
system. Heat masses are so big, that what you need is just:
- one time adjust of the system (more water on the cooler are, less on the
hotter are of the building);
- regulate the heat transfer with a linear function of the outside the
outside temperature (all modern heat generator do this).

I think the you can make the 1st with a thermal camera, the second is
straight forward..
If you need heat losses etc. of the building, you don't actually need more
than in & out temperature of the fluid and an estimation of the flow.

Ciao,

Simone

On Thu, Jan 29, 2009 at 5:42 PM, Volker Soffel <volker.soffel@ucpros.com>wr=
ote:

> At 06:20 AM 1/29/2009, you wrote:
> >From: "Andre Abelian" <aabelian@mason-electric.com>
> >
> >Why do you need to put temperature sensor in concrete ?
> >I am just cereus? Suppose you know the temperature ? then
> >What are going to do with it?
> >
> >Thanks
> >
> >Andre
>
> The purpose is to measure different heating zones of a solar powered
> radiant floor heating system
> for a single family home. Area of concrete approx 4200sqft. The
> temperature readings are used
> to adjust the hot water flow through the different zones and to monitor t=
he
> performance of the overall system in general (there will also be
> temperature sensors
> to monitor ground temperature  (below concrete - to verify
> effectiveness of insulation
> of concrete floor to underlying ground essentially), water
> temperature in the entry and return loops
> and outside air temperature, as water temperature also needs to be a
> function of the
> temperature delta between outside and inside temperatures.
>
> So for the concrete based sensors you are looking probably at
> something like 20 sensors
> with cable runs of up to 200 ft to get to the central collecting point.
>
>
> best regards
> Volker
> MicroController Pros Corporation
> microcontrollershop.com
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