CA2577224A1 - Central grey water heat recovery system - Google Patents

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).

Description

"1I10 prirritr~ t,)NCcthre k tcj rvJiaklk, ,itr!y a.nca ial a stlitab1t, 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;, 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.

Claims (3)

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)