RE: Placing DS1820's

["Nigel Giddings" <nigel.giddings@xxxxxxxxxxxxxx>]

Paul,

I also had a similar idea for my new house. I intend to use DS1820's to
monitor each room, at ceiling height, and using a Temp05 and Homeseer
with the mcsTemperature plug-in operate the UFH.

I am a way off installing the heating, the windows aren't in yet, but I
have installed a number of DS1820s in the basement to check stability of
the PC OS (Win2KServer), applications (Homeseer) and hardware (Temp05
and VIOM). There are no (Glass) windows in the basement...

I have been using something similar in my existing house with one
heating zone for about 2 years.

I have also mounted a DS1820 in the basement of the new house at ceiling
height, 2.4m, and another at about 1.5m, to monitor the delta between
measurements. Almost a scientific experiment.

The issue is that the basement is not heated so the range of
temperatures is limited, in the last month a max of 11c and a minimum of
3c.

What I have seen is that although the temperatures measured by each
sensor are different that consistently measure within 0.25 to 0.5
degrees C of each other. By using a 0.25 degree offset, set in
mcsTemperature, the measurements would be very similar. This difference
may be due to sensor height, or may just be due to the tolerance of the
sensors... I would need to install two more in the same positions to
check this.

>From what I have seen I don't think my heating would be wildly out of
step with what I need. I think responding to the well know UFH sluggish
response and possible overshoot would be more of an issue.

I could upload some graphs from mcsTemperature to the groups area if
that would help.

Regards

Nigel

-----Original Message-----
From: Paul Smith [mailto:ukha@xxxxxxx]
Sent: 19 February 2004 11:04
To: ukha_d@xxxxxxx
Subject: [ukha_d] Placing DS1820's

Hi Guys,

I'm shortly going to be putting DS1820 (1-wire temp sensors) in
each
room of the house.

The grand plan is to automate the heating and cooling of each
room.
So that I can set a desired temp and the system does the rest.

What I am wondering is does it matter where in the room the
sensors
are. I'm planning to mount them in the ceiling in a discreet vented box.
But
just want to check that this would be ok.

I know heat rises and therefore the temp at ceiling is going to
be
higher than at body height, so I think I can just compensate for this
change.


The current plan is this.

DS1820 in each room wired back to a TOM10 with autom8it plug-in
(Available Soon)

Then a set of relays driven by autom8it (again in the pipeline)
which operate valves, hidden in the floor, by each rad.

Also there will be X10 control of floor standing AC units where
available.


Regards,

Paul,



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