NL2025464B1 - A thermal energy recovery system - Google Patents

A thermal energy recovery system Download PDF

Info

Publication number
NL2025464B1
NL2025464B1 NL2025464A NL2025464A NL2025464B1 NL 2025464 B1 NL2025464 B1 NL 2025464B1 NL 2025464 A NL2025464 A NL 2025464A NL 2025464 A NL2025464 A NL 2025464A NL 2025464 B1 NL2025464 B1 NL 2025464B1
Authority
NL
Netherlands
Prior art keywords
heat pump
wastewater
filter
heat
recovery system
Prior art date
Application number
NL2025464A
Other languages
Dutch (nl)
Inventor
Johannes De Vries Auke
Hugo Wapperom Sander
Original Assignee
Dewarmte B V
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 Dewarmte B V filed Critical Dewarmte B V
Priority to NL2025464A priority Critical patent/NL2025464B1/en
Application granted granted Critical
Publication of NL2025464B1 publication Critical patent/NL2025464B1/en

Links

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
    • F24D17/02—Domestic hot-water supply systems using heat 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
    • F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
    • F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
    • F24D11/0235—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste 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
    • F24D11/00—Central heating systems using heat accumulated in storage masses
    • F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
    • F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
    • F24D11/0235—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste energy
    • F24D11/025—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste energy contained in waste 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
    • F24D2200/16—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
    • 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]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

Abstract

A thermal energy recovery system for wastewater, comprising a heat pump (1) with at least one heat exchanger (la, lb), and on a primary side (2) of the heat pump (1) an inlet (3) for the wastewater entering the system and an outlet (9) for the 5 wastewater leaving the system, and on a secondary side (13) of the heat pump (1) an inlet (14) for a cold fluid entering the system and an outlet (15) for heated fluid leaving the system, wherein downstream the inlet (3) for the wastewater into the system and upstream of the heat pump (1) a filter (5) is applied 10 for removal of solids from the wastewater prior to its entering the heat pump (1) on the primary side (2).

Description

A thermal energy recovery system The invention relates to a thermal energy recovery system, comprising a heat pump with at least one heat exchang- er, and on a primary side of the heat pump an inlet for wastewater entering the system and an outlet for the wastewater leaving the system, and on a secondary side of the heat pump an inlet for a cold fluid entering the system and an outlet for heated fluid leaving the system.
Such a thermal energy recovery system for domestic wastewater is disclosed by W02017/050623.
A disadvantage of the known thermal energy recovery system for wastewater is that recovery of heat from the wastewater is closely intertwined with the simultaneous heat- ing of tapwater to be taken from the system. Both processes of recovery of heat from the wastewater, and the heating of the tapwater have to occur simultaneously.
Correspondingly to the simultaneous recovery of heat and the heating of tapwater in the prior art, a further disad- vantage is that not all available wastewater is effectively used for recovery of heat. Roughly 30% of the water used in a household is used by flushing toilets. This source of energy is however not effectively used in the prior art.
A first object of the invention is therefore to make effective use of all available (domestic or office building) wastewater to recover as much thermal energy as possible.
A second object of the invention is to recover so much heat from the wastewater that it is possible to use the available heat not only for heating tapwater, but also for heating the spaces/rooms in the house where the system is em- ployed.
These and other objects and advantages of the inven- tion, which will become apparent from the following disclosure are provided by a thermal energy recovery system with the fea- tures of one or more of the appended claims.
In a first aspect of the invention downstream the in- let for the wastewater into the system and upstream of the heat pump a filter is applied for removal of solids from the wastewater prior to its entering the heat pump on the primary side, i.e. between the inlet for the wastewater of the system and the heat pump of this system, a filter is applied for re- moval of solids from the wastewater prior to its entering the heat pump on the primary side. This makes possible that virtu- ally all wastewater can be used for recovery of heat, not only the so-called grey wastewater, but also the black wastewater which would normally be directly disposed down the drain. Since in this manner also a higher level of heat can come available at the primary or entry side of the heat pump, the effectivity in the transfer of heat by the heat pump is also improved.
Preferably the filter is a passive non-pressurized flow filter. Such a filter does not use energy and is easily cleanable.
Desirable embodiments of the thermal energy recovery system of the invention have the feature that between the fil- ter and the primary side of the heat pump a first storage for filtered wastewater is provided.
Correspondingly it is desirable that at the secondary side of the heat pump a second storage for heated fluid is provided.
The mentioned first storage at the primary side and second storage at the secondary side of the heat pump makes the operational processes of recovering heat from the domestic wastewater, and providing the heated fluid at the secondary side of the heat pump independent from each other. Accordingly it is not only possible to use the system of the invention for heating tapwater from the energy available in (domestic or of- fice building) wastewater, but also to use the recovered heat for space heating in a building.
Moreover the first and second storages at the primary side and secondary side of the heat pump also open the way to improve the working efficiency of the at least one heat pump, and to design it with a lower capacity than what would be re- quired without storages. As a non-limiting example: When in an average Dutch household all the energy present in the wastewater during one day is spread out over 24 hours this re- sults in a required thermal conversion power of only 0.8 kW. The wastewater stream is variable and therefore completely equalizing the thermal power over the course of 24 hours would require a too large storage volume. An optimum between the re- quired storage volume and the heat pump thermal conversion power is reached at a thermal conversion power of 4 kW. Addi- tional storage on the secondary side may be required to ensure both instant hot water and a sufficient flow of 8 1/s for com- fortable showering and other tap water applications. The re- quired primary side storage volume is ~ 200L and the secondary side storage volume ~200L.
To remove fouling of the filter, it is preferable that the filter is provided with a purging system. Purging can be done using for instance the water pressure in the public water supply network, or filtered water available in the sys- tem.
To counter fouling of the filter it is desirable that the filter is provided with an internal coating.
Proper operation of the system is secured by arrang- ing that the system is provided with one or more pumps for circulating the wastewater on the primary side of the heat pump and/or the fluid on the secondary side of the heat pump.
The invention will hereinafter be further elucidated with reference to the drawing of an exemplary embodiment of a thermal energy recovery system according to the invention that is not limiting as to the appended claims.
In the drawing a single figure shows a PID diagram of the thermal energy recovery system of the invention.
The core of the thermal energy recovery system for domestic wastewater according to the invention is the heat pump denoted with reference 1.
The system further has an inlet 3 for wastewater and an outlet 9 for wastewater that has passed the heat pump 1. Going from inlet 3 to outlet 9, the wastewater first passes a filter 5, and is thereafter channelled through duct 6 to a first storage 7 for the filtered wastewater. Solid particles that the filter 5 has removed from a wastewater stream coming from the wastewater inlet 3, go directly through duct 8 to sewage outlet 9. Preferably the filter 5 is a passive non- pressurized flow filter.
The figure also shows that the filter 5 is provided with a purging system 21 for cleansing the filter 5, which can make use of cold water taken from an inlet 14. Although not shown it is further possible that the filter 5 is provided with an internal coating.
At the primary side 2 of the heat pump 1 there is further a first fluid pump 10 with which filtered domestic wastewater is transported from the first storage 7 into the heat exchanger through a duct 11. Wastewater which leaves the heat pump 1 and from which the heat is recovered, is guided through duct 12 to the sewage outlet 9.
At the secondary side 13 of the heat pump 1 an inlet 14 for a cold fluid, usually water, and an outlet 15 for heat- ed fluid is provided. The outlet 15 can be used for feeding hot tapwater outlets and/or for supplying heated fluid to a space heating system.
The fluid that is to be heated is provided at the in- let 14 and transported by a second pump 17 through a duct 16 at the secondary side 13 of the heat pump 1. In the heat pump 1 the fluid is taking up the energy recovered from the wastewater which is provided at the primary side 2 of the heat pump 1. A return stream of heated fluid leaves the heat pump 1 through duct 18, so as to arrive at a second storage 19 for the heated fluid. Hot tapwater or heating fluid used for space heating is then guided through duct 20 to the outlet 15 of the system.
For sake of completeness the figure also depicts that the heat pump 1 comprises a compressor lc for entertaining a stream of fluid in the channels connecting the heat exchangers la, 1b on the primary side and the secondary side of the heat pump 1.
Although the invention has been discussed in the foregoing with reference to an exemplary embodiment of the thermal energy recovery system of the invention, the invention is not restricted to this particular embodiment which can be varied in many ways without departing from the invention. The discussed exemplary embodiment shall therefore not be used to construe the appended claims strictly in accordance therewith. On the contrary the embodiment is merely intended to explain the wording of the appended claims without intent to limit the claims to this exemplary embodiment. The scope of protection of the invention shall therefore be construed in accordance with the appended claims only, wherein a possible ambiguity in the wording of the claims shall be resolved using this exem- 5 plary embodiment. Aspects of the inventions are itemized in the following sec- tion.
1. A thermal energy recovery system, comprising a heat pump (1) with at least one heat exchanger (la, lb}, and on a primary side (2) of the heat pump (1) an inlet (3) for the wastewater entering the system and an outlet (9) for the wastewater leaving the system, and on a secondary side (13) of the heat pump (1) an inlet (14) for a cold fluid entering the system and an outlet (15) for heated fluid leaving the system, characterized in that downstream the inlet (3) for the wastewater into the system and upstream of the heat pump (1) a filter (5) is applied for removal of solids from the wastewater prior to its entering the heat pump (1) on the pri- mary side (2).
2. The thermal energy recovery system of claim 1, characterized in that the filter (5) is a passive non- pressurized flow filter.
3. The thermal energy recovery system of claim 1 or 2, characterized in that downstream the filter (5) and up- stream the primary side (2) of the heat pump (1) a first stor- age (7) for filtered wastewater is provided.
4. The thermal energy recovery system of any one of claims 1 - 3, characterized in that at the secondary side (13) of the heat pump (1) a second storage (19) for heated fluid is provided.
5. The thermal energy recovery system of any one of claims 1 ~ 4, characterized in that the filter (5) is provided with a purging system (21) for cleansing of the filter.
6. The thermal energy recovery system of any one of claims 1 - 5, characterized in that the filter (5) is provided with an internal coating.
7. The thermal energy recovery system of any one of claims 1 - 6, characterized in that the system is provided with one or more pumps (10, 17) for circulating the wastewater on the primary side (2) of the heat pump (1) and/or the (heat- ed) fluid on the secondary side (13) of the heat pump (1)

Claims (7)

CONCLUSIESCONCLUSIONS 1. Warmteterugwinningssysteem, omvattende een warmtepomp (1) met ten minste één warmtewisselaar (la, 1b), en aan de primaire kant (2) van de warmtepomp (1) een inlaat (3) voor afvalwater dat het systeem binnenkomt en een uitlaat (9) voor het afvalwater dat het systeem verlaat, en aan een secundaire zijde (13) van de warmtepomp (1) een inlaat (14) voor een koude vloeistof die het systeem binnenkomt en een uitlaat (15) voor verwarmde vloeistof die het systeem verlaat, met het kenmerk, dat stroomafwaarts van de inlaat (3) voor het afvalwater in het systeem en stroomopwaarts van de warmtepomp (1) een filter (5) aanwezig is voor het verwijderen van vaste stoffen uit het afvalwater voordat het de warmtepomp (1) aan de primaire zijde (2) binnenkomt.A heat recovery system comprising a heat pump (1) with at least one heat exchanger (1a, 1b), and on the primary side (2) of the heat pump (1) an inlet (3) for waste water entering the system and an outlet ( 9) for the waste water leaving the system, and on a secondary side (13) of the heat pump (1) an inlet (14) for a cold liquid entering the system and an outlet (15) for heated liquid leaving the system characterized in that downstream of the inlet (3) for the waste water into the system and upstream of the heat pump (1) a filter (5) is provided for removing solids from the waste water before entering the heat pump (1) enters on the primary side (2). 2. Warmteterugwinningssysteem volgens conclusie 1, met het kenmerk, dat het filter (5) een passief niet onder druk werkzaam stromingsfilter is.Heat recovery system according to claim 1, characterized in that the filter (5) is a passive, non-pressurized flow filter. 3. Warmteterugwinningssysteem volgens conclusie 1 of 2, met het kenmerk, dat stroomafwaarts van het filter (5) en stroomopwaarts aan de primaire zijde (2) van de warmtepomp (1) een eerste opslag (7) voor gefilterd afvalwater is voorzien.A heat recovery system according to claim 1 or 2, characterized in that a first storage (7) for filtered waste water is provided downstream of the filter (5) and upstream on the primary side (2) of the heat pump (1). 4. Warmteterugwinningssysteem volgens een van de conclusies 1-3, met het kenmerk, dat aan de secundaire zijde (13) van de warmtepomp (1) een tweede opslag (19) voor verwarmde vloeistof is voorzien.Heat recovery system according to one of Claims 1 to 3, characterized in that a second storage (19) for heated liquid is provided on the secondary side (13) of the heat pump (1). 5. Warmteterugwinningssysteem volgens een van de conclusies 1-4, met het kenmerk, dat het filter (5) is voorzien van een zuiveringssysteem (21) voor het reinigen van het filter.A heat recovery system according to any one of claims 1-4, characterized in that the filter (5) is provided with a purification system (21) for cleaning the filter. 6. Warmteterugwinningssysteem volgens een van de conclusies 1-5, met het kenmerk, dat het filter (5) is voorzien van een interne coating.A heat recovery system according to any one of claims 1-5, characterized in that the filter (5) is provided with an internal coating. 7. Warmteterugwinningssysteem volgens een van de conclusies 1-6, met het kenmerk, dat het systeem is voorzien van een of meer pompen (10, 17) voor het circuleren van het afvalwater aan de primaire zijde (2) van de warmtepomp (1) en / of de (verwarmde) vloeistof aan de secundaire zijde (13) van de warmtepomp (1).A heat recovery system according to any one of claims 1-6, characterized in that the system is provided with one or more pumps (10, 17) for circulating the waste water on the primary side (2) of the heat pump (1) and/or the (heated) liquid on the secondary side (13) of the heat pump (1).
NL2025464A 2020-04-30 2020-04-30 A thermal energy recovery system NL2025464B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2025464A NL2025464B1 (en) 2020-04-30 2020-04-30 A thermal energy recovery system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2025464A NL2025464B1 (en) 2020-04-30 2020-04-30 A thermal energy recovery system

Publications (1)

Publication Number Publication Date
NL2025464B1 true NL2025464B1 (en) 2021-11-18

Family

ID=70614565

Family Applications (1)

Application Number Title Priority Date Filing Date
NL2025464A NL2025464B1 (en) 2020-04-30 2020-04-30 A thermal energy recovery system

Country Status (1)

Country Link
NL (1) NL2025464B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022245202A1 (en) 2021-05-17 2022-11-24 Dewarmte B.V. A thermal energy recovery system and house or building equipped with such a thermal energy recovering system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3119809A1 (en) * 1981-05-19 1982-12-09 Menerga Apparatebau GmbH, 4330 Mülheim Device for recovering heat from polluted waste water
WO2012061891A1 (en) * 2010-11-09 2012-05-18 Nexus Ewater Pty Ltd A process and apparatus for recovering energy from wastewater
WO2014130545A1 (en) * 2013-02-19 2014-08-28 Natural Systems Utilities, Llc Systems and methods for recovering energy from wastewater
DE102015224723A1 (en) * 2014-12-09 2016-06-09 Leonhard Prommegger Apparatus and method for heat recovery from waste water of a device operating with hot water
WO2017050623A1 (en) 2015-09-22 2017-03-30 Commissariat A L'energie Atomique Et Aux Energies Alternatives Device for producing domestic hot water by heat recovery from waste water, facility and associated production method
CN209970261U (en) * 2019-04-08 2020-01-21 苏州帝瀚环保科技股份有限公司 Water tank with filtering capability

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3119809A1 (en) * 1981-05-19 1982-12-09 Menerga Apparatebau GmbH, 4330 Mülheim Device for recovering heat from polluted waste water
WO2012061891A1 (en) * 2010-11-09 2012-05-18 Nexus Ewater Pty Ltd A process and apparatus for recovering energy from wastewater
WO2014130545A1 (en) * 2013-02-19 2014-08-28 Natural Systems Utilities, Llc Systems and methods for recovering energy from wastewater
DE102015224723A1 (en) * 2014-12-09 2016-06-09 Leonhard Prommegger Apparatus and method for heat recovery from waste water of a device operating with hot water
WO2017050623A1 (en) 2015-09-22 2017-03-30 Commissariat A L'energie Atomique Et Aux Energies Alternatives Device for producing domestic hot water by heat recovery from waste water, facility and associated production method
CN209970261U (en) * 2019-04-08 2020-01-21 苏州帝瀚环保科技股份有限公司 Water tank with filtering capability

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022245202A1 (en) 2021-05-17 2022-11-24 Dewarmte B.V. A thermal energy recovery system and house or building equipped with such a thermal energy recovering system

Similar Documents

Publication Publication Date Title
CA2901700C (en) Systems and methods for recovering energy from wastewater
CN201255500Y (en) Sewage waste heat recovery heat pump water heater
NL2025464B1 (en) A thermal energy recovery system
CN101097123A (en) Process for using DC water source cold-heat power supply
CN103615839B (en) Self-cleaning heat transfer enhanced solar sewage source heat pump system
CN109339877B (en) Coal-based distributed energy supply system
KR20150081796A (en) Rain Recycling System by Using Tourmaline Urethane Filter
CN202032789U (en) System for recycling heat energy of waste bath water of coal mine
CN103629837B (en) Efficient sewage heat exchange system capable of carrying out on-line cleaning and automatic decontamination
CN104534652A (en) Natatorium sewage, exhaust and heat recycling device and recycling method
CN203837331U (en) Mine water heat exchange device and system supplying heat through mine water
CN204574236U (en) A kind of secondary publilc baths waste water recycling system with Self-cleaning system
CN103629973B (en) On-line self-cleaning heat exchange enhancement solar sewage source heat pump system
CN103615926A (en) On-line self-cleaning heat transfer enhancement sewage source heat pump system
CN110160265A (en) A kind of full residual neat recovering system of bathhouse
CN103629972A (en) On-line self-cleaning heat exchange enhancement sewage source heat pump system
CN204574619U (en) A kind of publilc baths waste water recycling system with ancillary heating equipment
CN208282242U (en) A kind of heat pump integrates waste heat multiple-effect reuse bath hot water and prepares unit
CA2550281A1 (en) Method of increasing heat recovered by gfxtm system
CN205825497U (en) Sewage source heat pump system
CN105509315B (en) Water resource heat pump combines the control method of heat recovery system with plate heat exchanger
CN205033370U (en) Evaporate and press cauldron waste heat recovery device of system
CN203132416U (en) Waste-heat-recovery constant-temperature water heating system
CN204665664U (en) The publilc baths waste water recycling system that a kind of shower and bathing pool share
CN204373207U (en) Dining room, campus sewage, heat energy from waste gas recycle and reuse device