Re: OT : Plumbing help as well

[Bruno Prior <bruno@xxxxxxx>]

Simon,

Sounds like you've got the bases covered. Good luck with your system.

I am using a ground-source heatpump (more efficient than air-source) 
>from
The new house is a barn conversion with a couple of acres of land, so we
have space to lay what the heatpump people call "slinkies". These
are 
approx. 180-metre pipes tied in a series of 1-metre-diameter loops. I 
have four of these, each of which needs to be buried in a 1.5-metre+ 
deep, 40-metre long trench. This setup allows us to use the least amount
of land possible for a horizontal configuration for the heat exchange
pipes.

Cheers,

Bruno


Simon Coates wrote:
> Bruno,
> 
> Thanks for your comments - I agree with the advice you have been
given.
> That's why I want to make the ventilation system myself.
> The problem with a lot of commercial heat recovery systems is that
they are
> designed to be 'always on' providing a certain number of air changes
per
> hour in certain rooms.  What I want to do is recover some of the
heat that
> is extracted from our bathroom and en-suite, and the system to only
work
> when necessary.  Instead of just having bathroom fans which will
cause cold
> air to be drawn into the house from wherever it can get in, I'd like
to have
> a controllable ventilation system which also has a heat exchanger.
> The system I am thinking about is as follows:
> 
> Loft mounted heat exchanger
> Powerful fans inline with the ducting - extract and input in each
ventilated
> room
> Fans controlled via AD10/LD11 modules
> Automatic control of fans via HomeVision
> DS18S20 temperature sensors in each room (and outside)
> 
> The above will allow extract only, input only (positively pressurise
house)
> or extract and input with heat recovery.  Since HomeVision will
be
> controlling the system it will be easy to program the system to behave
as I
> want it.
> 
> The most difficult part is getting the right size heat exchange unit
to
> maximise efficiency since there will be varying flow rates.
> 
> Regards
> 
> Simon
> 
> BTW - your proposed ventilation system sounds interesting.  What
source are
> you going to use for your heat pump?



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