Heat from the sewer

 On Mon, 23 Jul 2007 19:02:52 -0700, Anthony Matonak


Thanks Anthony
We are taking that into consideration.

The temperature of the  water/antifreeze fluid circulating in the
sewer via 1 inch cooper pipe will be above zero C.The projected rate
is 15 gallons per minute and the city guaranties a flow of at list  30
gallons per minute. We are selecting a 60 cm's pipe not the more
common  30 cm's to minimize the risk of low flow over nigh when most
people are a sleep.

Under consideration is a pipe that gets the sewer from a local
hospital that has the advantage of some overnight flow but the
disadvantage of possible bacteria presence.
There is also a possibility of using the sewer from a new hotel that
also has sewer flow over night .
There is always the risk that one of those places may decide to
recuperate their on heat and in that case the efficiency of our system
will be, in the worst case,  reduced to the efficiency of a standard
geo thermal system . From COP 5 to COP4 since the temperature of the
environment around the sewer pipe will decrease .

In any case we are also considering the installation, at the same time
and part of the same assembly of a more standard system of a grid of
more then 100m of 1 inch buried cooper tubing under the utility pipes
that preheats our fluid before entering the main sewer system.
In short in the heating mode,  we estimate that will  to be sending
our water/antifreeze liquid to the preheating grid at plus 2 C that
will come out of the preheating grid at plus 5 C that will enter our
main system at the same plus 5 that will raise the temperature to plus
12. The rest is up to the heat pump inside of the house. It will heat
or  and cool  the house and the water all year round as required

The yearly cost of electricity required to satisfy the most common
requirements for energy for a house totally heated and cooled by
electricity in my area is in the order of $2,000.
Central heating and cooling plus hot water accounts to $1,400 , That
can be reduced to $280. May be the other $880 can be reduced to zero
by the application of PVs.
May be, by the time we finish this project, we will have a glass or
plastic roof that can be painted with squares of  PV material.

A set of drawings is to be submitted to a governmental lab for
evaluation before the installation starts.

This is mainly a prototype and we hope to get sufficient knowledge
that can be applied to future projects.
There will be several sensors located above and below ground level
whose information will transmitted via Internet, to our office to
minimize the inconvenience of local monitoring to the local residents

To the best of our knowledge this is the first time in north America
that a single residence is heated by the discarded heat from the
sewer.

The above may required more then the usual effort to be understood
My apologies. English is obviously not  my mother's language

Constructive comments are very welcome

John

 

Now if you could go and turn your toilet to 'heat' that would be pretty
funny.