EP4624809A1 - System zum heizen mindestens eines raums und zum bereitstellen von brauchwarmwasser und verfahren zum betreiben des systems - Google Patents

System zum heizen mindestens eines raums und zum bereitstellen von brauchwarmwasser und verfahren zum betreiben des systems

Info

Publication number
EP4624809A1
EP4624809A1 EP24165976.2A EP24165976A EP4624809A1 EP 4624809 A1 EP4624809 A1 EP 4624809A1 EP 24165976 A EP24165976 A EP 24165976A EP 4624809 A1 EP4624809 A1 EP 4624809A1
Authority
EP
European Patent Office
Prior art keywords
heat
heat pump
heat transfer
network
pump unit
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP24165976.2A
Other languages
English (en)
French (fr)
Inventor
Dr. Christopher OLKIS
Dr. James FREEMAN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric R&D Centre Europe BV
Mitsubishi Electric Corp
Mitsubishi Electric R&D Centre Europe BV Netherlands
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 Mitsubishi Electric R&D Centre Europe BV, Mitsubishi Electric Corp, Mitsubishi Electric R&D Centre Europe BV Netherlands filed Critical Mitsubishi Electric R&D Centre Europe BV
Priority to EP24165976.2A priority Critical patent/EP4624809A1/de
Priority to JP2025017571A priority patent/JP2025148248A/ja
Publication of EP4624809A1 publication Critical patent/EP4624809A1/de
Pending legal-status Critical Current

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
    • F24D3/00—Hot-water central heating systems
    • F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
    • 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
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
    • F24D19/1072—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water the system uses a heat pump
    • 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
    • F24D3/00—Hot-water central heating systems
    • F24D3/18—Hot-water central heating systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F24D2200/11—Geothermal 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
    • F24D2200/12—Heat pump
    • 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
    • F24D2200/12—Heat pump
    • F24D2200/123—Compression type 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
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/08—Storage tanks
    • 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
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/10—Heat storage materials, e.g. phase change materials or static water enclosed in a space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/003—Indoor unit with water as a heat sink or heat source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/004—Outdoor unit with water as a heat sink or heat source
    • 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
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • 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
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat

Definitions

  • the present invention is directed to a system for heating at least one space and for providing domestic hot water.
  • the system comprises a heat transfer device for providing domestic hot water, at least one emitter for heating the at least one space, the at least one emitter being provided within the at least one space, a reconfigurable fluid network for transferring a first heat transfer fluid, a first heat exchanger for transferring heat between the first heat transfer fluid and a second heat transfer fluid, a second heat exchanger for pre-heating water to be further heated by the heat transfer device to obtain domestic hot water, and a controller.
  • the reconfigurable fluid network comprises a heat pump unit, at least one valve, and pipes, the heat pump unit comprising a compressor and at least one expansion valve.
  • the reconfigurable fluid network is configurable by the controller in a plurality of specific configurations and the controller is configured such that it can operate the system in a plurality of specific modes.
  • the present invention also applies to a method for operating a system.
  • Water-to-water heat pumps are increasingly installed in multi-residential apartments. They are installed in individual apartments to deliver hot water and heating and can be connected to a heat network such as a 5th Generation ambient temperature district heat network, which is deployed throughout the building.
  • a heat network such as a 5th Generation ambient temperature district heat network
  • These water-to-water heat pump systems combine a heat pump refrigerant circuit and a domestic hot water (DHW) thermal energy storage (TES) in the indoor unit, whereas a typical air-to-water heat pump has the heat pump refrigerant circuit in the outdoor unit and the TES in the indoor unit.
  • DHW domestic hot water
  • TES thermal energy storage
  • the heat pump is often at the bottom of the indoor unit and in the top section is a cylinder for domestic hot water (DHW) provision.
  • a system for heating at least one space and for providing domestic hot water comprising
  • the system according to the present invention comprises a specific reconfigurable fluid network comprising a heat pump unit, wherein the heat transfer device, the at least one emitter for heating the at least one space, and the first heat exchanger for transferring heat between the first heat transfer fluid and the second heat transfer fluid are all connected to the reconfigurable fluid network.
  • the reconfigurable fluid network is configurable by a controller in a plurality of configurations in which the first transfer fluid can be transferred between different components of the system via the pipes of the reconfigurable fluid network.
  • the at least one valve (which is e.g. at least one three-way valve) can be switched by the controller to change the configuration of the reconfigurable fluid network.
  • the plurality of configurations comprise at least two configurations.
  • the reconfigurable fluid network is configured to transfer the first heat transfer fluid from (a high pressure side of) the heat pump unit to the heat transfer device (and back) but not to the at least one emitter.
  • the reconfigurable fluid network is configured to transfer the first heat transfer fluid from (a high pressure side of) the heat pump unit to the at least one emitter (and back) but not to the heat transfer device.
  • mains water is preheated by the second heat exchanger to a preheated mains water temperature.
  • the preheated mains water is then further heated to a domestic hot water outlet temperature by the heat transfer device.
  • the system according to the present invention comprises the second heat exchanger for pre-heating mains water to be further heated by the heat transfer device to obtain domestic hot water
  • the mains water heated by the heat transfer device to provide domestic hot water is already preheated and does not need to be heated as much so that the heat transfer device does not need to be a large thermal energy storage device to provide domestic hot water.
  • a smaller device as the heat transfer device, such as e.g. a (third) heat exchanger or a small thermal energy storage device.
  • a small device can be used as the heat transfer device in the system according to the present invention, so that also the system itself can be designed smaller and more compact.
  • the system can be realised in a small and compact design so that it requires only a relatively small amount of indoor space (for installation).
  • the system can be present in the form of a small and compact unit, e.g. a small and compact indoor unit.
  • cold mains water could be pre-heated by the second heat exchanger which is itself heated by a heat network, with e.g. 25 - 40 °C heat network temperature.
  • the water-to-water heat pump does not require a 170 L DHW cylinder to provide DHW but instead two alternatives are possible:
  • the heat pump can heat the mains water directly to a supply temperature of at least 40°C via a (third) heat exchanger used as the heat transfer device.
  • a small thermal energy storage device used as the heat transfer device can improve the heat pump efficiency by preventing very short heat pump compressor on-off cycles for small DHW discharges.
  • the small thermal energy storage device can be designed for discharges of 5 - 50 L, preferably 5 - 20 L.
  • the small thermal energy storage device is preferably comprised of PCM as thermal energy storage material but can also be comprised of a sensible heat store like a small DHW cylinder.
  • the specific reconfigurable fluid network comprises the heat pump unit and is connected to the heat transfer device, the at least one emitter, and the first heat exchanger, and since the first heat exchanger is external to the heat pump unit, a simplified and flexible system is obtained that can be operated in a plurality of specific modes comprising a mode for providing domestic hot water and a mode for heating the at least one space.
  • the plurality of modes also comprises a mode for both cooling the at least one space and providing domestic hot water (i.e. a mode in which the at least one space is cooled and domestic hot water is provided) wherein the heat removed from the at least one space is used for heating domestic hot water.
  • the plurality of modes comprise a (first) mode for providing domestic hot water and at least one (second) mode for heating the at least one space.
  • the reconfigurable fluid network In the at least one (first) mode for providing domestic hot water, the reconfigurable fluid network is configured in the first configuration. In the (second) mode for heating the at least one space, the reconfigurable fluid network is configured in the second configuration.
  • a flexible system is obtained in which a packaged heat pump (i.e. monobloc heat pump) or split-type heat pump can be used and which can be used in several modes.
  • a packaged heat pump i.e. monobloc heat pump
  • split-type heat pump can be used and which can be used in several modes.
  • the first heat exchanger for transferring heat between the first heat transfer fluid and a second heat transfer fluid can also be referred to as first external heat exchanger.
  • the second heat exchanger for pre-heating mains water to be further heated by the heat transfer device to obtain domestic hot water can also be referred to as second external heat exchanger.
  • the heat pump unit can comprise a complete heat pump comprising the compressor, a first heat pump heat exchanger, the at least one expansion valve, and a second heat pump heat exchanger, or the heat pump unit can be a heat pump subunit comprising only a part of a heat pump (e.g. comprising the compressor and the at least one expansion valve but not comprising any heat exchanger). If the heat pump unit is a heat pump subunit that does not comprise any heat exchanger, heat exchangers of the system arranged external of the heat pump unit can act as evaporator and condenser of the heat pump, so that a system similar to a split-type air-conditioning system (i.e. a traditional air-to-air air conditioning system) is provided, where the (e.g.
  • heating and air conditioning unit is supplied with refrigerant from an outdoor unit (of the traditional air-to-air air conditioning system) and can act as evaporator during cooling and condenser during heating mode.
  • Such heat exchangers of the system arranged external of the heat pump unit can be, e.g. the heat exchanger for transferring heat between the first heat transfer fluid and a second heat transfer fluid, the at least one emitter, and/or a heat exchanger of the heat transfer device.
  • the pipes of the reconfigurable fluid network can comprise pipes that are external to the heat pump unit and pipes that are internal to the heat pump unit.
  • the pipes that are internal to the heat pump unit can also be designated as (internal) pipes of the heat pump unit.
  • the pipes that are external to the heat pump unit can also be designated as distribution circuit.
  • a preferred embodiment of the system according to the present invention is characterized in that the heat pump unit is a water source heat pump unit.
  • a further preferred embodiment of the system according to the present invention is characterized in that the first heat transfer fluid comprises or consists of water or a refrigerant different from water.
  • a further preferred embodiment of the system according to the present invention is characterized in that the second heat transfer fluid comprises (or is) water, preferably water from a heat network, more preferably water from a district heat network.
  • the district heat network is preferably a low temperature heat network, more preferably a low temperature heat network with a supply temperature of at least 20 °C, even more preferably at least 30 °C, most preferably at least 40 °C.
  • a further preferred embodiment of the system according to the present invention is characterized in that the first heat exchanger and/or the second heat exchanger is/are connected to a heat network comprising a heat transfer fluid circuit (in which the second heat transfer fluid is flowing), wherein the heat network is preferably a low temperature heat network, more preferably a low temperature heat network with a supply temperature of at least 20 °C, even more preferably at least 30 °C, most preferably at least 40 °C.
  • a further preferred embodiment of the system according to the present invention is characterized in that the plurality of configurations further comprises a further configuration in which the reconfigurable fluid network is configured to transfer the first heat transfer fluid from the heat network to the at least one emitter and not to the heat pump unit, wherein the plurality of modes further comprise a mode for heating the at least one space by directly transferring thermal energy from a heat network to the at least one emitter, while bypassing the heat pump unit to conserve electricity, in which mode the reconfigurable fluid network is configured in the further configuration.
  • the adjustable valve can adjust the domestic hot water flow rate to meet a domestic hot water setpoint of preferably 40 to 50 °, e.g. 45 °C.
  • the reconfigurable fluid network is configured to transfer the first heat transfer fluid from (a low pressure side of) the heat pump unit to the at least one emitter (and back) and also to transfer the first heat transfer fluid from (a high pressure side of) the heat pump unit to the heat transfer device (and back).
  • pipes of the reconfigurable fluid network which are external to the heat pump unit, can be (or are) connected to both sides of the heat pump unit (i.e. a high pressure side and a low pressure side of the heat pump unit), e.g. to heat pump heat exchangers used as evaporator and condenser or to internal pipes of the heat pump unit on both sides of the heat pump unit.
  • the reconfigurable fluid network is configured in the third configuration in which third configuration the reconfigurable fluid network is configured to transfer the first heat transfer fluid from the heat pump unit to the at least one emitter and from the heat pump unit to the first thermal energy storage device, (heat) energy (or heat) obtained by cooling the at least one space can be used for heating the heat transfer device and thus providing domestic hot water instead of rejecting the heat to the ambient through an air heat exchanger, which results in an energy efficient provision of domestic hot water without wasting the heat obtained by space cooling.
  • the system according to the present invention is an energy efficient system that allows providing domestic hot water, heating at least one space, and cooling the at least one space.
  • a reversible heat pump can be obtained e.g. by the heat pump unit comprising a four-way valve that is arranged such that the heat pump cycle can be reversed.
  • the heat pump is a heat pump subunit, it comprises only a part of a heat pump (e.g. comprises the compressor and the at least one expansion valve but does not comprise any heat exchanger). If the heat pump unit is a heat pump subunit that does not comprise any heat exchanger, heat exchangers of the system arranged external of the heat pump unit can act as evaporator and condenser of the heat pump, so that a system similar to a split-type air-conditioning system (i.e. a traditional air-to-air air conditioning system) is provided, where the (e.g.
  • heating and air conditioning unit is supplied with refrigerant from an outdoor unit (of the traditional air-to-air air conditioning system) and can act as evaporator during cooling and condenser during heating mode.
  • Such heat exchangers of the system arranged external of the heat pump unit can be, e.g. the heat exchanger for transferring heat between the first heat transfer fluid and a second heat transfer fluid, the at least one emitter, and/or a heat exchanger of the heat transfer device.
  • the heat pump unit is a heat pump subunit and/or comprises internal pipes for transferring the first heat transfer medium to the compressor and away from the compressor and for transferring the first heat transfer medium to the at least one expansion valve and away from the at least one expansion valve, it is preferred that the first heat transfer fluid is a refrigerant different from water.
  • the heat pump unit comprises an internal refrigerant circuit circulating a third heat transfer fluid
  • the first heat transfer fluid is water and/or the third heat transfer fluid is a refrigerant different from water.
  • a further preferred embodiment of the system according to the present invention is characterized in that the at least one (heat) emitter for heating and cooling the at least one space comprises
  • a further preferred embodiment of the system according to the present invention is characterized in that the heat transfer device, the reconfigurable fluid network (and thus also the heat pump unit), the first heat exchanger, the second heat exchanger are arranged within one indoor unit.
  • the present invention also relates to a method for operating the system according to the present invention, in which method the controller operates the system at least in a mode for providing domestic hot water and/or in a mode for heating the at least one space.
  • a further preferred embodiment of the method according to the present invention is characterized in that the controller additionally operates the system in a mode for cooling the at least one space, preferably in a mode for cooling the at least one space and providing domestic hot water.
  • a further preferred embodiment of the method according to the present invention is characterized in that the controller additionally operates the system in a mode for heating the at least one space by directly transferring thermal energy from a heat network to the at least one emitter, while bypassing the heat pump unit to conserve electricity.
  • the first heat exchanger and/or the second heat exchanger is/are connected to the heat network, wherein the heat network comprises a heat transfer fluid circuit (in which the second heat transfer fluid is flowing), wherein the heat network is more preferably a low temperature heat network, even more preferably a low temperature heat network with a supply temperature of at least 20 °C, even more preferably at least 30 °C, most preferably at least 40 °C.
  • Fig. 1 shows a schematic view of a first example (Example 1) of the system according to the present invention.
  • the system comprises a heat transfer device 19 for providing domestic hot water, heat emitters 14 for heating (and optionally cooling) at least one space, a reconfigurable fluid network for transferring a first heat transfer fluid, a first heat exchanger 15, a second heat exchanger 21, and a controller (not shown in Fig. 1 ).
  • the first heat transfer fluid is water.
  • the reconfigurable fluid network comprises a heat pump unit 1, two pumps 8, 9, four three-way valves, and pipes.
  • the heat pump unit 1 is a water-to-water heat pump unit comprising a (complete) water-to-water heat pump.
  • the heat pump unit 1 comprises an internal refrigerant circuit circulating a third heat transfer fluid, the internal refrigerant circuit comprising a first heat pump heat exchanger 2, two expansion valves 3a, 3b, a refrigerant receiver 4, a second heat pump heat exchanger 5, a four-way valve 6, and a compressor 7, wherein the first heat pump heat exchanger 2 and the second heat pump heat exchanger 5 are each connected to pipes of the reconfigurable fluid network which are external to the heat pump unit 1.
  • the third heat transfer fluid is a refrigerant different from water.
  • the first heat exchanger 15 is a heat exchanger for transferring heat between the first heat transfer fluid and a second heat transfer fluid, the second heat transfer fluid being external to the reconfigurable fluid network, wherein the first heat exchanger 15 is external to the heat pump unit 1.
  • the second heat transfer fluid comprises (or is) water (e.g. from a district heating network).
  • the second heat exchanger 21 is a heat exchanger for pre-heating mains water to be further heated by the heat transfer device 19 to obtain domestic hot water.
  • the first heat exchanger 15 and/or the second heat exchanger 21 are connected to a low temperature heat network 20 (e.g. a district heating network) via the same refrigerant circuit wherein the low temperature heat network has a supply temperature of at least 20 °C, preferably at least 30 °C, more preferably at least 40 °C.
  • a low temperature heat network 20 e.g. a district heating network
  • Example 1 allows direct use of thermal energy from the heat network for space heating, while bypassing the heat pump unit to conserve electricity.
  • the heat emitters 14 can be directly connected to heat exchanger 15 through the reconfigurable fluid network and pump 8.
  • the controller of the system according to Example 1 is configured such that it can operate the system in a plurality of modes (operating modes), wherein the reconfigurable fluid network is configurable by the controller in a plurality of configurations.
  • the four three-way valves are switchable by the controller to change the configuration of the reconfigurable fluid network.
  • Fig. 3 , Fig. 4 , and Fig. 5 show schematic views of a control strategy and of two operating modes DHW-1 and DHW-2 of the system according to Example 1, wherein in this case the heat transfer device 19 is a small thermal energy storage device (DHW-TES) having a domestic hot water discharge volume capacity of not more than 50 l.
  • Fig. 3 shows the control strategy.
  • DHW-TES small thermal energy storage device
  • Fig. 4 shows a schematic view of mode DHW-1 of the system according to Example 1.
  • mode DHW-1 the state of charge of the DHW-TES drops below a SOC-threshold, which can be in the range of 40 - 90 %, but is preferably in the range of 40 - 70 %.
  • the heat pump unit is turned on and the internal refrigerant circuit of the heat pump unit 1 is preheated until the temperature in the first heat pump heat exchanger 2 reaches a threshold temperature.
  • the system is then switched over to a mode DHW-2. It can be beneficial, if the heat emitters can be bypassed in the heat emitter circuit in mode DHW-1. The bypass would enable faster heating of the internal refrigerant circuit of the heat pump unit 1 to reach the temperature threshold in a shorter period of time.
  • Fig. 5 shows a schematic view of mode DHW-2 of the system according to Example 1.
  • the heat pump charges the DHW-TES and/or heats mains water to the desired domestic hot water outlet temperature.
  • V w is the DHW flow rate
  • ⁇ w is the density of water
  • c p,w is the specific heat capacity of water
  • T dhw is the DHW outlet temperature, i.e. 45 °C in this example
  • T pm is the preheated mains water temperature.
  • the dependence of the system performance on the desired DHW flow rate also arises from the diagrams shown in Fig. 6a and 6b .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Water Supply & Treatment (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Air Conditioning Control Device (AREA)
EP24165976.2A 2024-03-25 2024-03-25 System zum heizen mindestens eines raums und zum bereitstellen von brauchwarmwasser und verfahren zum betreiben des systems Pending EP4624809A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP24165976.2A EP4624809A1 (de) 2024-03-25 2024-03-25 System zum heizen mindestens eines raums und zum bereitstellen von brauchwarmwasser und verfahren zum betreiben des systems
JP2025017571A JP2025148248A (ja) 2024-03-25 2025-02-05 少なくとも１つの空間を暖房するとともに家庭用温水を提供するためのシステム、及びシステムを動作させるための方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP24165976.2A EP4624809A1 (de) 2024-03-25 2024-03-25 System zum heizen mindestens eines raums und zum bereitstellen von brauchwarmwasser und verfahren zum betreiben des systems

Publications (1)

Publication Number Publication Date
EP4624809A1 true EP4624809A1 (de) 2025-10-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP24165976.2A Pending EP4624809A1 (de) 2024-03-25 2024-03-25 System zum heizen mindestens eines raums und zum bereitstellen von brauchwarmwasser und verfahren zum betreiben des systems

Country Status (2)

Country Link
EP (1) EP4624809A1 (de)
JP (1) JP2025148248A (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2414289A (en) * 2004-05-19 2005-11-23 Asker Barum Kuldeteknikk A S A heat pump installation
US20180156474A1 (en) * 2014-11-10 2018-06-07 Energy Machines S.A. Heating installation
US10274207B2 (en) * 2013-05-14 2019-04-30 Energy Machines Aps Heating installation
EP4249812A1 (de) * 2022-03-25 2023-09-27 Mitsubishi Electric R&D Centre Europe B.V. System und verfahren zum bereitstellen von brauchwarmwasser und/oder raumheizung innerhalb eines gebäudes

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2414289A (en) * 2004-05-19 2005-11-23 Asker Barum Kuldeteknikk A S A heat pump installation
US10274207B2 (en) * 2013-05-14 2019-04-30 Energy Machines Aps Heating installation
US20180156474A1 (en) * 2014-11-10 2018-06-07 Energy Machines S.A. Heating installation
EP4249812A1 (de) * 2022-03-25 2023-09-27 Mitsubishi Electric R&D Centre Europe B.V. System und verfahren zum bereitstellen von brauchwarmwasser und/oder raumheizung innerhalb eines gebäudes

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