Re: rack power question

> >  i'm too close to san francisco bay.
> 
> Why is that bad? I thought ground-source HVAC systems
worked better if
> the ground was saturated with water. Better thermal
conductivity than
> dry soil.

aside from the corrosive nature of the salt and other
minerals, there is an
unbelievable maze of permits from various layers of
government since there's
a protected marshland as well as habitat restoration within
a few miles.  i
think it's safe to say that Sun Quentin could not be built
under current
rules.

> My problem finding someone to install a ground-source
system was that
> everyone for miles is on city water. You have to be
able to drill a
> hole in the ground and the folks familiar with
well-drilling equipment
> are three hours away.

i could drill in the warehouse, i suppose, and truck the
slurry out by night.

Paul Vixie wrote:
>
> aside from the corrosive nature of the salt and other
minerals, there is an
> unbelievable maze of permits from various layers of
government since there's
> a protected marshland as well as habitat restoration
within a few miles.  i
> think it's safe to say that Sun Quentin could not be
built under current
> rules.
>   
The ones I have are MDPE (Medium Density Polyethylene) and I
haven't 
understood that the plastic would have corrosive features.
Obviously it 
can come down to regulation depending on what you use as a
cooling agent 
but water is very effective if there is no fear of freezing
(I use 
ethanol for that reason). The whole system is closed
circuit, I'm not 
pumping water out of the ground but circulating the ethanol
in the 
vertical ground piping of approximately 360 meters. The
amount of slurry 
that came out of the hole was in order of 5-6 cubic meters.
Cannot 
remember exactly what the individual parts cost but the
total investment 
was less than $10k. (drilling, piping, circulation, air
chiller, fluids, 
etc.) for a system with somewhat over 4kW of cooling
capacity. (I'm 
limited by the airflow, not by the ground hole if the
calculations prove 
correct)

Pete