WO2011158032A2 - Waste water recycling and heat recovery system - Google Patents

Waste water recycling and heat recovery system Download PDF

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Publication number
WO2011158032A2
WO2011158032A2 PCT/GB2011/051124 GB2011051124W WO2011158032A2 WO 2011158032 A2 WO2011158032 A2 WO 2011158032A2 GB 2011051124 W GB2011051124 W GB 2011051124W WO 2011158032 A2 WO2011158032 A2 WO 2011158032A2
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WO
WIPO (PCT)
Prior art keywords
water
heat
waste water
recovery system
heat recovery
Prior art date
Application number
PCT/GB2011/051124
Other languages
French (fr)
Other versions
WO2011158032A3 (en
Inventor
Peter Holdsworth
Original Assignee
Peter Holdsworth
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peter Holdsworth filed Critical Peter Holdsworth
Publication of WO2011158032A2 publication Critical patent/WO2011158032A2/en
Publication of WO2011158032A3 publication Critical patent/WO2011158032A3/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/0036—Domestic hot-water supply systems with combination of different kinds of heating means
    • F24D17/0042—Domestic hot-water supply systems with combination of different kinds of heating means recuperated waste heat and solar energy
    • F24D17/0047—Domestic hot-water supply systems with combination of different kinds of heating means recuperated waste heat and solar energy with accumulation of the heated water
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B1/00—Methods or layout of installations for water supply
    • E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
    • E03B1/041—Greywater supply systems
    • E03B1/042—Details thereof, e.g. valves or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D11/00—Central heating systems using heat accumulated in storage masses
    • F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
    • F24D11/005—Central heating systems using heat accumulated in storage masses water heating system with recuperation of waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/0094—Recovering of cold water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0012—Recuperative heat exchangers the heat being recuperated from waste water or from condensates
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B1/00—Methods or layout of installations for water supply
    • E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
    • E03B1/041—Greywater supply systems
    • E03B2001/045—Greywater supply systems using household water
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C2001/005—Installations allowing recovery of heat from waste water for warming up fresh water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/14—Solar energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/16—Waste heat
    • F24D2200/20—Sewage water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/146—Water conservation; Efficient water supply; Efficient water use using grey water
    • Y02A20/148—Water conservation; Efficient water supply; Efficient water use using grey water using household water from wash basins or showers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/20—Solar thermal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/18—Domestic hot-water supply systems using recuperated or waste heat
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/56—Heat recovery units

Definitions

  • This invention relates to a waste water recycling and heat recovery system integrated with a solar water heating panel and a direct soiar water tank.
  • a waste water recycling and heat recovery system comprising water storage means having a first inlet for receiving waste water to be reused, a second inlet for receiving freshwater, an outlet means for supplying water for reuse, a first heat exchanger for extracting heat from the waste water and supplying heat to a hot water storage tank and a second heat exchanger for extracting solar energy and supplying heat to said hot water storage tank.
  • system further comprises control means for selectively activating whichever heat exchanger has the higher temperature heat source.
  • the water storage means has first and second interconnected chambers the first having the first inlet means and the second having the second iniet means.
  • Said means for operating the second inlet means is preferably a float operated valve.
  • the desired minimum water level preferably provides a cold water buffer between the pair of interconnected chambers.
  • Preferably means are provided to restrict sediment in the waste water from transferring from the first chamber to the second chamber.
  • pump means are provided for supplying said water for reuse from the water storage means.
  • the system includes drainage means for receiving any excess waste water.
  • control system includes means for purging the storage means of all water and refilling the storage means to the desired minimum level from the second inlet means
  • Figure 1 is a front view of part of a waste water recycling and heat recovery system in accordance with the present invention
  • Figure 2 is a plan view of the waste water recycling and heat recovery system of Fig 1 ;
  • Figure 3 is perspective view of the waste water recycling and heat recovery system of Fig 1.
  • a waste water recycling and heat recovery system is shown generally at 10 and comprises a pair of copper tanks 1 1 , 12 joined together by a pair of pipes 13, 14.
  • the lower of the two pipes, 13, allows water to move between the tanks while the upper pipe, 14, allows air to move between the tanks.
  • the system is air tight but has an air admittance valve at the top which allows air in while a non return valve 15 on an overflow pipe 16 allows excess air to exit the system.
  • a deflector plate 19 in tank 11 shrouds the lower pipe 13 to allow sedimentation to happen in the tank and prevent larger solids being drawn into the smaller tank 2.
  • a heat exchanger 9 is housed in the larger tank 1 1 and connects to an external hot water tank (not shown).
  • a ball valve arrangement 20 controls the flow of fresh water into the smaller tank 12.
  • the overflow pipe 6 connects up with a purge pipe 21 controlled by a valve 22 and exits to waste at 23. Water is supplied from the system to toilets via a pumped outlet 24 with overall control being provided by a control system 25.
  • waste bath and shower water enters and fills up the system through the inlet 17 and has remaining heat extracted from it by the heat exchanger 19 and used to pre heat the external hot water tank.
  • the system provides a supply for toilets via the pumped outlet 24 thus ensuring that both heat and the water itself from baths and showers is recycled.
  • the excess can exit to waste at 23 via the overflow pipe 16.
  • the ball valve arrangement 20 allows clean water to enter the system up to a minimum level 26 thus ensuring that there is always water available for toilet flushing via the pumped outlet 24.
  • a second benefit of the clean water supply is that it forms a layer at the bottom of the tanks which creates a cold water buffer at the bottom of the tanks which stops the flow of heat from the large tank 1 1 to the small tank 12 when bath or shower water comes into the tank 1 .
  • This allows for a large temperature differential to exist between the large tank 1 1 with the heat exchanger 19 and the small tank 12 which supplies the toilets for a period of time to allow effective extraction of heat from the water in the large tankl .
  • the control system 25 operates the pumped outlet 24 to ensure that pressure is maintained in the toilet supply.
  • a low and high pressure switch arrangement operates to turn on the pumped outlet 24 when pressure in the distribution pipe to the toilets falls below 0.5 bar and pressurises the system while filling the toilets in the normal way through the toilets internal ball valve.
  • the control system 25 then turns off the pumped outlet when the toilet is full and the pipe pressure reaches 3 bar.
  • a small pressure reservoir stops hunting of the pump as the pressure drops back and compensates for the effect of slightly leaky ball valves.
  • the control system 25 is also thermostatically controlled to monitors the system temperature and operate the heat exchanger circuit as appropriate to maximise the heat transfer to the external hot water tank.
  • the system also works in conjunction with a solar panel system, the control system 25 monitors which part of the composite system has the highest temperature and operates so as to transfer that heat first to the external hot water tank transferring to the other source as the relative temperatures change.
  • the tanks and pipework are of copper construction which helps to minimise bio film build up but the build up of bacteria is also discouraged by introducing appropriate quantities of disinfectant and soap neutralising material.
  • the control system 25 can also be set to purge itself empty of all water in both tanks before refilling with clean water to the minimum level 26 on a regular basis, for example every 24 or 72 hours.
  • control system also provides further control options. For example manual control of system purging can be provided allowing the system to be purged outside the automatic cleaning cycle if required.
  • the system can also have a sleep function which pits the system to sleep when the premises are unoccupied for any length of time such as for holiday periods.
  • Water and energy savings provided by the system vary with system size, usage patterns and availability of solar energy. However typically savings of 25% -30% of water use per household are envisaged which equates to an annual saving of 54750 Itrs for a typical family of four. Heat available is typically 5 kWh per 100 Itrs of water. Thus again for a typical family of four usage of around 140lts per day can be expected thus providing an energy store of around 7 kwh of which, after losses, around 4 kwh per day can be saved providing 1460 kwh annually. A typical solar panel hot water installation can save around 900 kWh per year making a total potential saving of 2360 kWh per average household.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

A waste water recycling and heat recovery system (10) comprises a pair of linked tanks (11 ), (12). The larger tank (11) is supplied with used bath and shower water while the smaller tank (12) is supplied from the cold water supply. A heat exchanger (19) is housed in the larger tank (11) and connects to an external hot water tank. Water is supplied from the system to toilets under control of a control system (25). In operation waste bath and shower water enters the system and has heat extracted from it by the heat exchanger (19) to pre heat the external hot water tank. The system provides a supply for toilets thus ensuring that both heat and the water itself from baths and showers is recycled. The clean water supply forms a layer at the bottom of the tanks which creates a cold water buffer which allows for a large temperature differential to exist between the tanks to allow effective extraction of heat from the water in the large tank (11). The system also works in conjunction with a solar panel system, the control system (25) monitors which part of the composite system has the highest temperature and operates so as to transfer that heat first to the external hot water tank transferring to the other source as the relative temperatures change.

Description

WASTE WATER RECYCLING AND HEAT RECOVERY SYSTEM
This invention relates to a waste water recycling and heat recovery system integrated with a solar water heating panel and a direct soiar water tank.
BACKGROUND
Historically domestic hot water systems have been total loss systems. That is to say that hot water used for baths or showers simply enters the house drainage system after use with both the water and any remaining heat it contains being lost after a single use. With increasing population densities the demand on water supplies has increased greatly which coupled with greater rainfall variations may lead to potential supply shortages. Accordingly there is a growing awareness of a need to reduce water supply usage where possible. At the same time increasing demands on finite energy supplies and environmental concerns have led to a growing need to use energy more efficiently.
Previous proposals have therefore been made for recycling this grey water for toilet usage and also for extracting heat from it. However such systems suffer from inefficiencies and a lack of flexibility with the availability of grey water and extracted heat not necessarily best matching the demands for recycled water and recovered heat.
BRIEF SUMMARY OF THE DISCLOSURE
In accordance with the present inventions there is provided a waste water recycling and heat recovery system comprising water storage means having a first inlet for receiving waste water to be reused, a second inlet for receiving freshwater, an outlet means for supplying water for reuse, a first heat exchanger for extracting heat from the waste water and supplying heat to a hot water storage tank and a second heat exchanger for extracting solar energy and supplying heat to said hot water storage tank.
Preferably the system further comprises control means for selectively activating whichever heat exchanger has the higher temperature heat source.
Preferably also the water storage means has first and second interconnected chambers the first having the first inlet means and the second having the second iniet means. Preferably also means are provided for operating the second inlet means to maintain a desired minimum water level in said storage means.
Said means for operating the second inlet means is preferably a float operated valve.
The desired minimum water level preferably provides a cold water buffer between the pair of interconnected chambers.
Preferably means are provided to restrict sediment in the waste water from transferring from the first chamber to the second chamber.
Preferably also pump means are provided for supplying said water for reuse from the water storage means.
Preferably also the system includes drainage means for receiving any excess waste water.
Preferably also the control system includes means for purging the storage means of all water and refilling the storage means to the desired minimum level from the second inlet means
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention are further described hereinafter with reference to the accompanying drawings, in which:
Figure 1 is a front view of part of a waste water recycling and heat recovery system in accordance with the present invention;
Figure 2 is a plan view of the waste water recycling and heat recovery system of Fig 1 ; and
Figure 3 is perspective view of the waste water recycling and heat recovery system of Fig 1.
DETAILED DESCRIPTION
Referring to the drawings a waste water recycling and heat recovery system is shown generally at 10 and comprises a pair of copper tanks 1 1 , 12 joined together by a pair of pipes 13, 14. The lower of the two pipes, 13, allows water to move between the tanks while the upper pipe, 14, allows air to move between the tanks. The system is air tight but has an air admittance valve at the top which allows air in while a non return valve 15 on an overflow pipe 16 allows excess air to exit the system. The larger of the two tanks
11 is supplied with used bath and shower water through an inlet 1 while the smaller tank
12 is supplied from the cold water supply via an inlet 18. A deflector plate 19 in tank 11 shrouds the lower pipe 13 to allow sedimentation to happen in the tank and prevent larger solids being drawn into the smaller tank 2. A heat exchanger 9 is housed in the larger tank 1 1 and connects to an external hot water tank (not shown). A ball valve arrangement 20 controls the flow of fresh water into the smaller tank 12. The overflow pipe 6 connects up with a purge pipe 21 controlled by a valve 22 and exits to waste at 23. Water is supplied from the system to toilets via a pumped outlet 24 with overall control being provided by a control system 25.
In operation waste bath and shower water enters and fills up the system through the inlet 17 and has remaining heat extracted from it by the heat exchanger 19 and used to pre heat the external hot water tank. At the same time the system provides a supply for toilets via the pumped outlet 24 thus ensuring that both heat and the water itself from baths and showers is recycled. In the event that more waste water than the system can hold is available then the excess can exit to waste at 23 via the overflow pipe 16. In the opposite case where an inadequate supply of used shower or bath water is available then the ball valve arrangement 20 allows clean water to enter the system up to a minimum level 26 thus ensuring that there is always water available for toilet flushing via the pumped outlet 24. A second benefit of the clean water supply is that it forms a layer at the bottom of the tanks which creates a cold water buffer at the bottom of the tanks which stops the flow of heat from the large tank 1 1 to the small tank 12 when bath or shower water comes into the tank 1 . This allows for a large temperature differential to exist between the large tank 1 1 with the heat exchanger 19 and the small tank 12 which supplies the toilets for a period of time to allow effective extraction of heat from the water in the large tankl .
The control system 25 operates the pumped outlet 24 to ensure that pressure is maintained in the toilet supply. A low and high pressure switch arrangement operates to turn on the pumped outlet 24 when pressure in the distribution pipe to the toilets falls below 0.5 bar and pressurises the system while filling the toilets in the normal way through the toilets internal ball valve. The control system 25 then turns off the pumped outlet when the toilet is full and the pipe pressure reaches 3 bar. A small pressure reservoir stops hunting of the pump as the pressure drops back and compensates for the effect of slightly leaky ball valves.
The control system 25 is also thermostatically controlled to monitors the system temperature and operate the heat exchanger circuit as appropriate to maximise the heat transfer to the external hot water tank. The system also works in conjunction with a solar panel system, the control system 25 monitors which part of the composite system has the highest temperature and operates so as to transfer that heat first to the external hot water tank transferring to the other source as the relative temperatures change.
The benefit of this combination in domestic installations is that showers and baths are typically taken in the morning when the solar panel is at its lowest temperature so that latent heat in the recycled water is moved first to the external hot water tank and then as the temperature builds up in the solar system during the day the system switches over to take advantage of this heat. Still later as the solar panel becomes less efficient in the evening then heat is likely to be available from evening baths and showers and so the system switches over once again. The hot water system efficiency is thus enhanced with a reduced reliance on external heating input.
The tanks and pipework are of copper construction which helps to minimise bio film build up but the build up of bacteria is also discouraged by introducing appropriate quantities of disinfectant and soap neutralising material. The control system 25 can also be set to purge itself empty of all water in both tanks before refilling with clean water to the minimum level 26 on a regular basis, for example every 24 or 72 hours.
The control system also provides further control options. For example manual control of system purging can be provided allowing the system to be purged outside the automatic cleaning cycle if required. The system can also have a sleep function which pits the system to sleep when the premises are unoccupied for any length of time such as for holiday periods.
Water and energy savings provided by the system vary with system size, usage patterns and availability of solar energy. However typically savings of 25% -30% of water use per household are envisaged which equates to an annual saving of 54750 Itrs for a typical family of four. Heat available is typically 5 kWh per 100 Itrs of water. Thus again for a typical family of four usage of around 140lts per day can be expected thus providing an energy store of around 7 kwh of which, after losses, around 4 kwh per day can be saved providing 1460 kwh annually. A typical solar panel hot water installation can save around 900 kWh per year making a total potential saving of 2360 kWh per average household.
Throughout the description and claims of this specification, the words "comprise" and "contain" and variations of them mean "including but not limited to", and they are not intended to (and do not) exclude other components, integers or steps. Throughout the description and claims of this specification, the singular encompasses the plural unless the context otherwise requires. In particular, where the indefinite article is used, the specification is to be understood as contemplating plurality as well as singularity, unless the context requires otherwise.
Features, integers and characteristics described in conjunction with a particular aspect, embodiment or example of the invention are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive. The invention is not restricted to the details of any foregoing embodiments. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims

1. A waste water recycling and heat recovery system comprising water storage means having a first inlet for receiving waste water to be reused, a second inlet for receiving freshwater, an outlet means for supplying water for reuse, a first heat exchanger for extracting heat from the waste water and supplying heat to a hot water storage tank and a second heat exchanger for extracting solar energy and supplying heat to said hot water storage tank.
2. A waste water recycling and heat recovery system as claimed in Claim 1 wherein control means are provided for selectively activating whichever heat exchanger has the higher temperature heat source.
3. A waste water recycling and heat recovery system as claimed in Claim 1 or 2 wherein the water storage means has first and second interconnected chambers the first having the first inlet means and the second having the second inlet means.
4. A waste water recycling and heat recovery system as claimed in any one of the preceding Claims wherein means are provided for operating the second inlet means to maintain a desired minimum water level in said storage means.
5. A waste water recycling and heat recovery system as claimed in Claim 4 wherein said means for operating the second inlet means is preferably a float operated valve.
6. A waste water recycling and heat recovery system as claimed in Claim 4 or 5 wherein the desired minimum water level preferably provides a cold water buffer between the pair of interconnected chambers.
7. A waste water recycling and heat recovery system as claimed in any one of Claims 3 to 6 wherein means are provided to restrict sediment in the waste water from transferring from the first chamber to the second chamber.
8. A waste water recycling and heat recovery system as claimed in any one of the preceding Claims wherein pump means are provided for supplying said water for reuse from the water storage means.
9. A waste water recycling and heat recovery system as claimed in any one of the preceding Claims wherein the system includes drainage means for receiving any excess waste water.
10. A waste water recycling and heat recovery system as claimed in any one of the preceding Claims wherein means are provided for purging the storage means of all water and refilling the storage means to the desired minimum level from the second inlet means
1.
PCT/GB2011/051124 2010-06-16 2011-06-16 Waste water recycling and heat recovery system WO2011158032A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1010059.2 2010-06-16
GBGB1010059.2A GB201010059D0 (en) 2010-06-16 2010-06-16 Waste water recycling and heat recovery system

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WO2011158032A2 true WO2011158032A2 (en) 2011-12-22
WO2011158032A3 WO2011158032A3 (en) 2013-06-27

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WO2014029989A1 (en) 2012-08-24 2014-02-27 Reaqua Systems Ltd Waste water recycling system
WO2014029990A1 (en) 2012-08-24 2014-02-27 Reaqua Systems Ltd Waste water recycling system
WO2014029991A1 (en) 2012-08-24 2014-02-27 Reaqua Systems Ltd Waste water recycling system
WO2014029992A1 (en) 2012-08-24 2014-02-27 Reaqua Systems Ltd System for the recuperation of heat in grey water
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US11306978B2 (en) 2014-09-05 2022-04-19 2078095 Ontario Limited Heat recovery apparatus and method
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