Re: Re: Computer Controlled Underfloor heating

["Simon Coates" <ecolume@xxxxxxx>]

Bill,

You're right about the response time of UFH.  But with using something
like
HV as a controller rooms can have different setback temperatures
dependant
upon things like occupancy and external temperature.  UFH has latency
so you
can program external weather compensation into your schedule  ie. by
knowing
both the room temperature and the external temperature the room
temperature
can be controlled before an external temperature change has an affect on
the
room.

With occupancy detection the room is already held at an 'room
unoccupied'
temperature, say 18oC, and then triggered to an 'occupied' temperature,
say
21oC, allowing the room to warm up quicker.  Doesn't matter if you
quickly
leave the room, you haven't really 'lost' anything - the valve will turn
off
and the room will drop to the setback temperature again.  If you stay
in the
room then it's going to do what you had intended it to do!  The same
room
could have another setback temperature of 16oC when the house is
unoccupied.
This all helps to save energy which is important, especially in a house
like
mine that is exposed and with most rooms having 3 external walls.

I've only used UFH in 3 rooms that are likely to be at a fairly
constant
temperature anyway - kitchen, office and downstairs loo.  The rest of
the
house has conventional radiators which are much quicker to respond -
although not as efficient and comfortable as UFH.  Most UFH systems
are
approx 25% more efficient than using radiators and if I could have I'd
have
fitted UFH in more rooms.

Regards

Simon




----- Original Message -----
From: happy_hammer66 <bill.mcmahon@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: 18 June 2002 15:18
Subject: [ukha_d] Re: Computer Controlled Underfloor heating


> What's the response time like? I thought that underfloor heating
was
> slow to heatup/cooldown so by the time an occupancy detector
flagged
> that you were in a room and increased the heat you had probably
left
> the room already because it wasn't warm enough.
>
> bill
>
>
>
>
>
> > Frank Mc
> >   ----- Original Message -----
> >   From: Simon Coates
> >   To: ukha_d@xxxxxxx
> >   Sent: Tuesday, June 18, 2002 9:54 PM
> >   Subject: Re: [ukha_d] Computer Controlled Underfloor
heating
> >
> >
> >     My replies:
> >
> >
> >     sounds great but I was think more of a
system that can report
> status (HV can report status - temperature of each room, occupancy
of
> each room, wheter the rads/UFH is on or not etc.... it can
basically
> do whatever you want)  and accept instructions from a PC or
other
> system, the idea being that it would operate as a stand alone
system
> with overrides from the home automation/security systems.
> (My 'philiosophy' for HA has been standalone yet integrated systems
-
> ie. having HV do the automation work, Comfort doing the security
and
> Futronix handling most of the lighting - all separate systems but
can
> talk to each other.  For heating, however, I thought that HV
would be
> ideal mainly from the fact that the support for DS18S20s is so
good,
> and that it's fairly easy to program a 'clever' heating schedule)
> This would allow (for example) the heating to be set back when the
> house alarm is in away mode and would give more flexibility than
one
> of the 'standard' systems with regards shedules and remote
> operation.  (Comfort tells HV that we are out and HV adjusts
the
> schedule to suit)
> >
> >
> >
> >     There are two main reasons for retaining
a system that will
> work without interfacing to a HA system as I see it....first if
the
> property is sold just take out the interfaces and you have a bog
> standard UFH system (if I sold our house then the heating system
> could be easily downgraded to 'normal' control, but I think having
an
> intelligent heating system installed would be a good selling
> point!) ..second if the HA system is down the UFH will still
operate
> correctly although with limited functionality (Firstly, HV is
> extremely reliable, and secondly I can override all valves
manually
> and still have a central heating system that is better than most
> standard systems)
> >
> >     Mick - have you tried Velta UFH systems -
they sell some
> sophisticated stuff - bit expensive though.
> >
> >     Regards
> >
> >     Simon
> >
> >     Mick
> >
> >       -----Original
Message-----
> >       From: Simon Coates
[mailto:ecolume@g...]
> >       Sent: 18 June 2002 11:58
> >       To: ukha_d@xxxxxxx
> >       Subject: Re: [ukha_d]
Computer Controlled Underfloor heating
> >
> >
> >       Sort of my own!
> >       System consists of 17mm
PEX/AL/PEX pipe used as UFH in
> screeded floors and same pipe to feed conventional radiators - all
> via manifolds with each zone controlled via actuator valves. 
Each
> room with DS18S20 sensors and occupancy PIRs linked to HV. 
Boiler
> and distribution valves controlled via HV outputs and actuator
valves
> controlled via X10 relay board.
> >       Downstairs I've fitted a 3
zone UFH manifold and an 8 zone
> distribution manifold - upstairs there's a 7 zone distribution
> manifold.
> >       Not got all the sensors
fitted yet, but so far I'm happy with
> the system.
> >       Soon HV will control the
heating dependant on time of
> day/year, external temp, house occupancy/room occupancy, guest
mode
> etc...  well that's the theory :o)
> >
> >       Regards
> >
> >       Simon
> >         ----- Original
Message -----
> >         From: Mark
Harrison
> >         To:
ukha_d@xxxxxxx
> >         Sent: 18 June
2002 11:53
> >         Subject: RE:
[ukha_d] Computer Controlled Underfloor heating
> >
> >
> >         Ah? Which system
are you installing?
> >
> >         Regards,
> >
> >         Mark
> >          
-----Original Message-----
> >           From:
Simon Coates [mailto:ecolume@g...]
> >           Sent:
18 June 2002 11:44
> >           To:
ukha_d@xxxxxxx
> >          
Subject: Re: [ukha_d] Computer Controlled Underfloor
> heating
> >
> >
> >           I'm
installing my own system at the moment controlled via
> HomeVision.
> >
> >          
Simon
>
>            
----- Original Message -----
>
>            
From: Mick Furlong
>
>            
To: ukha_d@xxxxxxx
>
>            
Sent: 18 June 2002 11:40
>
>            
Subject: [ukha_d] Computer Controlled Underfloor heating
> >
> >
>
>            
has anyone come across an underfloor heating system
> which can be controlled from a PC?
> >
>
>            
Several of the ones I have found have their own
> microprocessor control but no way to allow any external control
from
> your own devices.
> >
>
>            
Mick
> >
>
>            
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