CENTRAL GREY WATER HEAT RECOVERY SYSTEM

SYSTEME RECUPERATEUR DE CHALEUR CENTRAL POUR EAUX GRISES

English Abstract

With energy prices continuing to increase and the need to reduce greenhouse
gases from
building space conditioning it is becoming very important to come up with new
innovative ideas to reduce energy consumption in all existing and new
buildings,
especially in multi-unit residential buildings (apartments and condominiums).
The idea of using less energy is becoming very popular in the construction
business:
through more efficient building envelopes (increased levels of wall and roof
insulation,
more efficient windows etc ---}, or by heat recovery ventilation to pre-
condition fresh air
through air exchangers, higher efficiency hot water boilers and the
substitution of fossil
fuels with renewable energy.
In fact there is global environmental initiative which calls for all new
buildings and major
renovations to reduce their fossil-fuel greenhouse-gas-emitting energy
consumption by
50 per cent immediately, increasing, this reduction to 60 per cent in 2010, 70
percent in
2015,80 per cent in 2020, 90 per cent in 2025, and finally, that all new
buildings be
carbon neutral by 1030.
There is tremendous energy wastage during the hours of the morning and the
evening
when multiples showers, baths or dishwashers usage are at peak, due to the
large amount
of warm and hot water going down the drains into city sewage systems.
The new CGWHR "Central Grey Water Heat Recovery" with CDHR "Central Domestic
Heat Re-inject" concept recovers energy from hot water going down the drain at
22 to 32
°C (80 to 90°F) to the sewer system and re-injects the heat into
the main domestic hot
water supply, line. Once the heated domestic hot water enters the building, a
heat pump is
used to create a cold 15 °C (60 °F) and a hot 49 °
C(120°F).

Claims

Claims:
The embodiments of the invention in which an exclusive property or privilege
is claimed
are defined as follows and shown on attached drawing.
1) A method of the invention is to heat the domestic water supply using a heat
exchanger/heat pump plant by recovering energy from the sewer line. (See
Figure 1).
2) A method of the invention is the distribution of the pre-heated domestic
line into the building (See Figure 1)
3) A method of the invention is the creation a cold and a hot distribution
lines
from the heat pump supplying a hot tank and a cold tank (See Figure 1)

Description

CA 02577224 2007-01-30
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Qt~pab]c manner to c xmact
~ ~CT-U\ l:0411 a c05. tir:wiwe m-stcrn astti us#.- the recovert.d et}c:rLr}
tc) ~rC-1~iut tht~ rtatkr ~)
t
1tiC StreeE.
Disc~~~sur e. of the ~nvenhon:
I I:L Ii'+ IIT7j3lei-n:'fla a new CGW~ ~IZ 'Ct'wral Cfrb; WzkleFHedit; ~~'
k.}t<C'(6 Yy' ~}~
Cf:) iiR "C +:iatMs s.~tytfiic':tiC h041 rw"-inicci.
t 1 ~ }=rst CmNbi:iijnertt 44tiic i:; tf.} ~ie~at t3te donaestic wa-tcr
sti(#F?h
u,a1tg a Fetw euh.an~cr;"Ijeal pump pÃant bti thu x"Ll~eF
iir~~=,
2) A w~q~nd crnbadiment of the ittven~ot~ bs. th,~ dls,trih- wticn dki'-]tt
prv-Itc,#col
domestic line into the buil&r~~<
3) A third cprE+crdi aunt oi'th~~ i 7Vz;Wa0tt iS thC CrUai9~.~t~ a cotd and a
hot
di_;aribL~ior lim~- l:R?;tP :bc hc.at pump supplying a hat t a~~~ ~~~d ~a
4:old wnt;,

CA 02577224 2007-01-30
Sum maa Of .ile InYentton:
I:iwrg;~ ~L0t LrV systCntsaM heCtAbingrtture popular witlt the increase in
fussiit i'Lw[
priccs, W;tmi grey water from whtiwcrs, baths.laun.drS;= t}t-PJ di.4t%ashing
is lcin~ wwst~
doxvn the drains to tlw ciiv sewage "swIm. This wastc:J w:ttcr carrics large
anitiunts of
t1ivrttiai energy. which is not being rcwvccc3.
The Oire y Watea-11eat iiecoveni Systtrtt will ailow the storage of tte,
wasted water for
k~,toklg,lt tirrre to extracr that heat hcfore it is drained into the eity
sewagt~ systern. Pk
k ktra-etc-0 he:it wa11 be used to pre-heut 4.1c incoming cold water to the
desit~~
(k:mpcrattrre. i f-wrei"crrr, the w ater heating pMaeS4 tVill cctnsume lcks
eatergy and ssve on
i'~~ss'il tu~l i~osts .arA reduce Ci.reenlwww Cw emi~.~ itansa
:!)e-swription T The Preferred FAnixodiment
(.'oridomtniu:ms and rnufti-unit re-siclenteal buildirtg tccuparits iase h+.it
water for slowers,
hath.s ariti dishwasEait~t, w1 tr:dh occur ditring a 51=iGrt interval (--f
tittte, usta1ly in the morning
aa,a:l t}ivn in the eveni;ng, During these times, h.eut'tl water Fs tccn
wasted down the draiii
and to t3te ciq= ~~~vagge system. In a typi-ual 84-unit residential building,
whcrt: Ov'er
peot,3e rv~sidc, the amount of hoi watt-r wasted i:s sigrtific~irrl anti most
(if the wastc,+~ heat
;;:~n K'! reiow~.kred<
Step 1: A hedt exa;b.urrger,'Cwat ptttzip plant (5) is installed as shown ani
vaEve (3), (9)
lx,ero 0ow-tl and (2). ~~~~ (6), t;7) in thw opcm pcgidian, Ibe flow trovin
the sewrr lin~
17-4) through 1 ''7 j into the heat eXchaiger heat pump planx (5) and out rvia
(28) atuJ
back into the systeni line (8). At #he sam.c time. sflow frottt the colt3
Joniestic line
( 11.) 1hrciugh (26) intki the hcat exc~ger ~heat pump plutrt (+) ard kiut via
{1-5 ) wid
Niwk iiito tlt~ System line i291.
Notc: 'I'hc 4c,mponci its c.Ff ti.ue tu:at vx+:fijngcr1br.at pufnp p[a.r-a (3)
aN grca waicr
ho1dirtig tanl;, griitdr,l3ot wal.cr stor;tge tank; and heut exc hangcr w'ith
~.~r witltraut lteat
pticra tr
Stcp': I'hepreheatecl dormst.ic i1ow in piN (29) is distfiiv+utetl to
Isuildiitw, i l 2:P k'ia
hnc(t6')AiYpicu! i::n3tMiation ins-ide the bctittling (12), (! 3), (14)x (l5)
is the heat
Punip,witla a cold and a hot tank.
4