WO2023111291A1 - Heating network with heating and cooling applicability - Google Patents

Heating network with heating and cooling applicability Download PDF

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Publication number
WO2023111291A1
WO2023111291A1 PCT/EP2022/086406 EP2022086406W WO2023111291A1 WO 2023111291 A1 WO2023111291 A1 WO 2023111291A1 EP 2022086406 W EP2022086406 W EP 2022086406W WO 2023111291 A1 WO2023111291 A1 WO 2023111291A1
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WO
WIPO (PCT)
Prior art keywords
main
line
fluid
local
connection
Prior art date
Application number
PCT/EP2022/086406
Other languages
French (fr)
Inventor
Jan Eric Thorsen
Oddgeir GUDMUNDSSON
Atli Benonysson
Original Assignee
Danfoss A/S
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Filing date
Publication date
Application filed by Danfoss A/S filed Critical Danfoss A/S
Publication of WO2023111291A1 publication Critical patent/WO2023111291A1/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
    • F24D10/00—District heating systems
    • F24D10/003—Domestic delivery stations having a heat exchanger
    • 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
    • F24D11/001—Central heating systems using heat accumulated in storage masses district heating system
    • 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
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
    • F24H15/429—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data for selecting operation modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/18—Details or features not otherwise provided for combined with domestic apparatus
    • F24F2221/183—Details or features not otherwise provided for combined with domestic apparatus combined with a hot-water boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/54—Heating and cooling, simultaneously or alternatively

Definitions

  • the background of this invention is to offer the service of cooling as an add on to the service of heating, or possible also cooling.
  • the thermal energy from the cooling can be utilized in e.g. the local heating system or in the area deployed district heating system.
  • the service of cooling can be realized, based on one pair of area laid district heating pipes, compared to the traditional solution where a dedicated pair of district heating pipes and a dedicated pair of district cooling pipes are offering the service of heating and cooling in parallel.
  • a thermal storage tank enables the option of improved utilization of the produced heat for local use.
  • This includes introducing a heating system comprising main lines with a main supply line adapted to feed thermal energy to heat transferring devices by a main heating or cooling fluid, and main return line adapted to return cooled or heated heating fluid, where a hot connection of a second part of a thermal transfer unit via a second main branch line is connected to the main supply line and a second part cold connection via a first main branch line to the main return line and where a cold connection of a first part of the thermal transfer unit is connected upstream and a hot connection of the first part is connected downstream of the heat transferring devices and where in the thermal transfer unit thermal energy is transferred from fluid flowing from the first part hot connection to cold connection and is transferred to the fluid flowing from the cold connection to the hot connection in the second part.
  • the thermal transfer unit may be adapted to transfer the thermal energy when the temperature of the second part cold connection is higher than the temperature of the first part hot connection.
  • the main lines may be in thermal connection to local lines via a heat exchanger including a local supply line to supply a local heating fluid to the heat transferring devices and a local return line returning fluid from the heat transferring devices back to the heat exchanger, wherein the local heating fluid is heated by thermal transfer from the main heating fluid in the heat exchanger.
  • the main lines may alternatively be directly connected to or forms part of local lines including a local supply line to supply a local heating fluid to the heat transferring devices and a local return line returning fluid from the heat transferring devices back to the main return line.
  • a first local branch line may connect the local return line to a hot connection of the first part of the thermal transfer unit and where a second local branch line connects to a first part cold connection, where the fluid in the hot connection has a higher temperature than the fluid in the cold connection.
  • Cooling branch lines may be connected to the local branch lines with a cooling branch supply line connected to the first local branch line and a cooling branch return line connected to the second local branch line, where the cooling branch lines (35, 36) is connected to heat transferring devices adapted for cooling.
  • the local return line may connect to the local return line by a diversion valve.
  • cooling branch lines are connected to the local branch lines with a cooling branch supply line connected to the first local branch line and a cooling branch return line connected to the second local branch line, where the cooling branch lines are connected to devices adapted for cooling.
  • a thermal reservoir is in fluid connection to respectively the second part hot and cold connections.
  • the thermal reservoir may further be connected to respectively the first and second main branch lines.
  • the thermal reservoir may further be connected to instantaneous lines with a first instantaneous line connecting the main supply line to a hot fluid connection and the second instantaneous line connecting the main return line to a cold fluid connection of the thermal reservoir.
  • the thermal reservoir may further be connected to the first main branch line by a first bypass line connecting it to the second instantaneous line and is connected to the second main branch line by a second bypass line connecting it to the first instantaneous line.
  • the thermal reservoir further may be connected to the first main branch line by a first bypass line and to the second main branch line by a second bypass line.
  • the heat disposal means may be connected to the heat transfer unit allowing the removal of thermal energy from e.g. the heating system.
  • the heating system may be adapted to operate in a heating mode where thermal energy is delivered to the heat demanding devices, and in a first cooling mode where thermal energy is removed from the heat demanding devices.
  • the heating system may further be adapted to operate in a second cooling mode where thermal energy is removed from the heat demanding devices and where thermal energy is feed back to the main supply line in a direction away from the heat transferring devices to be used by other consumers.
  • the present invention further relates to a cooling system similar to the heating system of any of the previous claims, but where the operation is reversed such that the heat transferring devices in thermal connection to the fluid in the main lines are adapted for cooling and the heating fluid is a cooling fluid, the main return line having a higher temperature than the main supply line, and where the heat transfer unit is adapted to transfer thermal heating to the cooling devices if a heating is required.
  • the thermal energy extracted may be used for quick heating of domestic use water and could thus be connected to tapping stations.
  • the present invention further relates to a method to operate a heating system comprising main lines with a main supply line adapted to feed thermal energy to heat transferring devices by a main heating fluid, and main return line adapted to return cooled heating fluid, where a hot connection of a second part of a thermal transfer unit via a first main branch line is connected to the main supply line and a second part cold connection via a second main branch line to the main return line and where a cold connection of a first part of the thermal transfer unit is connected upstream and a hot connection of the first part is connected downstream of the heat transferring devices and where in the thermal transfer unit thermal energy is transferred from fluid flowing from the first part hot connection to cold connection and is transferred to the fluid flowing from the cold connection to the hot connection in the second part, wherein the method includes for the thermal transfer unit to extract thermal energy from the heat demanding devices to enable them to operate in a first cooling mode.
  • Fig. 1 A first embodiment of the heating circuit according to the present invention including a thermal transfer unit.
  • Fig. 2 An embodiment of the heating circuit in a heating mode supplying heat to heat transferring devices.
  • Fig. 3 An embodiment of the heating circuit in a first cooling mode where heat is extracted from the heat transferring devices and feed back to the main lines and/or a thermal reservoir.
  • Fig. 4 An embodiment of the heating circuit in a first cooling mode where heat is extracted from the heat transferring devices and feed back to the main lines, a heat exchanger and/or a thermal reservoir, and back to the heat supplying network and/or plant.
  • Fig. 5 An embodiment of the heating circuit adding a cooling circuit which can operate in parallel to the heating circuit.
  • Fig. 6 An embodiment of the heating circuit where a thermal reservoir is positioned at a different branch from the thermal transfer unit.
  • Fig. 7 An embodiment of the heating circuit where a thermal reservoir is positioned at a different branch from the thermal transfer unit, but where the branches are connected.
  • Fig. 8 Another embodiment of the heating circuit where a thermal reservoir is positioned at a different branch from the thermal transfer unit, but where the branches are connected.
  • Fig. 9 An embodiment of the heating circuit where the thermal energy extracted is feed to an ambient sink.
  • Fig. 10 An embodiment of the heating circuit where a heat exchanger is positioned between the main lines and a thermal transfer unit.
  • FIG. 11 A first embodiment of the heating circuit according to the present invention including a thermal transfer unit with direct connection to the consumers.
  • Figure 1 illustrate a first embodiment of the present invention with a heating or cooling system (1 ) including main lines including a main supply line (2) and main return line (3).
  • the main lines (2, 3) are adapted to feed thermal energy to heating transferring devices, such as floor heating/cooling installations, radiators, cooling fans etc. In the illustrated embodiment they via a heat exchanger (9) are in thermal connection to local lines including a local supply line (4) and local return line (5).
  • the main (2,3) and local (4, 5) lines are directly connected, or the one being part of the other.
  • the system (1 ) is described mainly as a heating system (1 ), and the heat transferring devices being heat consuming devices but the operation could be reversed, the heat transferring devices being cooling devices being supplied with a main cooling fluid adapted to remove thermal energy from a space by the cooling devices, and where the system (1 ) enables the transfer of thermal energy to the cooling devices if a heating is required.
  • a main heating fluid is feed from the main supply line (2) to a first flow path of the heat exchanger (9), also referred to as the primary side.
  • a colder local heating fluid is feed to the second flow path of the heat exchanger, also referred to as the secondary side, by a local return line (5) and in the heat exchanger (9) thermal energy is transferred from the main to the local heating fluid.
  • the now cooled main heating fluid is then returned by the main return line (3) and the heated local heating fluid is feed to the aby the local supply line (4).
  • thermal energy in the local heating fluid is used for cooling the fluid, which subsequently is returned by the local return line (5) to the heat exchanger (9).
  • a set of main branch lines (11 , 12) connects to a thermal reservoir or heat exchanger (10) (in the following predominantly referred to as thermal reservoir) with a first main branch line (11 ) to a cold fluid part, and with a second main branch line (12) to a hot fluid part.
  • thermal reservoir or heat exchanger
  • first main branch line (11 ) to a cold fluid part
  • second main branch line (12) to a hot fluid part.
  • cold and hot fluid means the fluid in the cold fluid part is colder than the fluid in the hot fluid part.
  • the first main branch line (11 ) in the illustrated embodiment thus connects the thermal reservoir (10) to the main return line (3) and the second branch line (12) connects the thermal reservoir (10) to the main return line (2).
  • a thermal transfer unit (6) is connected to the heating system (1 ) transferring thermal energy from a first part (7) to a second part (8) of the thermal transfer unit (6).
  • the thermal transfer unit (6) is defined by being able of transfer thermal energy from a first fluid to a second fluid, the second fluid being hotter than the first, said thermal transfer unit (6) transferring thermal energy from a fluid in a first part (7) to a fluid in a second part (8) of the thermal transfer unit (6).
  • the thermal transfer unit (6) may be a heat pump in the usual sense formed with the first part (7) e.g. being the cold part, or evaporator, and the second part (8) e.g. being the hot part, or condenser. Further it then would include a compressor (20) and expansion valve (21 ).
  • An alternative thermal transfer unit (6) could e.g. be a Peltier element.
  • Local branch lines (13, 14) connect the thermal transfer unit (6) to the local lines (3, 4).
  • the second part (8) is connected to the local return line (5) by a first local branch line (13) and the local supply line (4) by a second local branch line (14).
  • a set of reheating lines (16, 17) connects the second fluid connection (8) to the thermal reservoir (10) with a first reheating line (16) connecting to the hot fluid part and the second reheating line (17) connecting to the cold fluid part.
  • the first reheating line (16) further connects to the second main branch line (12) and the second reheating line (17) to the first main branch line (11 ).
  • pumps (15) may be inserted where needed, such as where flow needs to be driven against a pressure difference like illustrate for the second main branch line (12), to drive fluid from the thermal reservoir (10) to the main supply line (2) having higher pressure than in the thermal reservoir (10).
  • a check valve (31 ) is inserted in the second main branch line (12) to prevent flow from the main supply line (2) to the thermal reservoir (10).
  • the check valve (31 ) alternatively could be inserted in the first main branch line (11 ).
  • the heating system may further comprise flow control valves (34), temperature sensors (33) and pressure independent or pressure regulating valves (32) where required.
  • a diversion valve (30) such as a 3-way valve, connects the local return line (5) to the first local branch line (13) to define the flow rate to the thermal transfer unit (6), such as to open and close the fluid connection.
  • instantaneous lines (24, 25) further are connected to the main lines (2, 3) e.g. through a heat exchanger (9) as illustrated, or a thermal reservoir.
  • the instantaneous lines (24, 25) in the illustration comprises an instantaneous supply line (24) and instantaneous return line (25) connected to the secondary side of the instantaneous heat exchanger (9), whereas the instantaneous heat exchanger (9) primary side is connected to the main supply line (2) and main return line (3) respectively.
  • the instantaneous lines (24, 25) are not directly connected to the thermal reservoir (10), and in an embodiment they connect to heat exchanging devices not adapted for cooling, but only for heating.
  • the heating consuming devices of the local lines (4, 5) are adapted for both cooling and heating, this e.g. being the floor heating installation, whereas the instantaneous lines (24, 25) connects to devices such as e.g. water taps for domestic water tapping, or other radiator or floor heating installations, where no cooling will be required
  • a flow control valve (34) may be positioned in relation to the thermal reservoir (10) connection to the first main branch line (11 ) and/or second reheating line (17) enabling to set the flow rate to the thermal reservoir (10) to a requirement, e.g. from the main return line (3) to replenish it, or simply to change the flow rate to meet a requirement.
  • Flow control valves (34), or as illustrated, pressure independent valve (32), positioned in relation to the reheating lines (16, 17), local branch lines (13, 14) and/or the main branch lines (11 , 12), may be in data exchange communication with temperature sensors (33) e.g. positioned in connection to the inlet or outlet connections of the first (7) and/or second (8) part. This allows the regulation of the respective flow rates if the temperatures get’s too high or low according to a setpoint, or range.
  • Fig. 2 is the same heating system (1 ) as fig. 1 but showing a heating mode where the local (4, 5) and instantaneous local (24, 25) lines are directly supplied with thermal energy from the main lines (2, 3) via heat exchangers (9).
  • this mode there are no circulation in the local branch lines (13, 14), the connection e.g. being closed by the diversion valve (30), and the thermal transfer unit (6) is inactive.
  • the fluid connections (11 , 12, 16, 17) to the thermal reservoir are closed.
  • This heating mode is like an ordinary heating system, such as they are found in e.g. district heating, and is mainly adapted for heating purposes only.
  • Fig. 3 illustrates a first cooling mode where the secondary side connection to the heat exchanger (9) connecting to the local lines (4, 5) are closed, e.g. by the diversion valve (30) diverting the return fluid from the heat transferring devices to the first local branch line (13) rather than back to the heat exchanger (9).
  • a pump (15) is positioned in relation to the local lines (4, 5) in a position allowing it to circulate fluid between the connected heat transferring devices and the heat exchanger (9) and/or the thermal transfer unit (6), or both, according to a selected mode, e.g. by the setting of the diversion valve (30).
  • a pump (15) is positioned at the local return line (5) between the heat transferring devices and the connection of the second local branch line (13). Alternatively, it could have been positioned at the local supply line (4) between the connection to the first local branch line (14) and heat transferring devices.
  • the first local branch line (13) connects to the first part (7) of the thermal transfer unit (6) at a hot connection
  • the second local branch line (14) connects to the first part (7) cold connection.
  • cold and hot connection is referred to the fluid at the one connection be colder or hotter than at the other connection.
  • the second part (8) of the thermal transfer unit (6) connects with a hot connection to the hot fluid part of the thermal reservoir (10) by the first reheating line (16) and with a cold connection to the cold fluid part by a second reheating line (17).
  • a pump (15) may be connected to e.g. the first reheating line (16) to circulate fluid.
  • Fluid is circulated in local lines (4, 5), connected heat transferring devices, the local branch lines (13, 14) and first part (7).
  • the local return line (5) is connected to the first part (7) hot connection, heat is extracted and via the thermal transfer unit (6) moved to the fluid in the first reheating line (16).
  • the heat then could be feed to the thermal reservoir (10) to be stored for later use, and/or directly back to the main lines (2, 3) such as to the main supply line (2) adding thermal energy and heat to the heating procedures in the heat exchangers (9).
  • Stored thermal energy in the thermal reservoir (10) then could be directed to the main supply line (2) when needed, or just requested.
  • the pump (15) connected to the first main branch (12) allows for feeding the heated fluid from the thermal reservoir (10) and I or directly from the first reheating line (16) to the main supply line (2).
  • the second part (8) cold connection connects to the colder part of the thermal reservoir (10) for feeding cold fluid to be heated in the second part (8) by heat extracted from the fluid passing the first part (7).
  • Fluid could also alternatively, or additionally, be extracted from the main return line (3), or this could be selectable.
  • the thermal reservoir (10) could also be connected to a further fluid inlet allowing the supply of new fluid.
  • Thermal energy, or heat are thereby extracted from the fluid supplied to the heat transferring devices connected to the local lines (4, 5), such as floor heating installations, radiators etc.
  • the ambient temperature e.g. room temperature and floor temperature of a living space where the heat transferring devices are installed, will exchange thermal energy with the fluid in the heat transferring devices. If this is warmer that the fluid, thermal energy will flow to the fluid, rather than from the fluid, and will therefore have a cooling effect on the e.g. living space.
  • This thermal energy is then transferred via the thermal transfer unit (6) to the first reheating line (16).
  • Fig. 4 illustrates a second cooling mode where a part of the thermal energy from the cooling in the local lines (4, 5) and extracted via the thermal transfer unit (6) is feed partly as thermal energy supplied to the heat exchanger (9) separating the main lines (2, 3) from the local lines (4, 5), and part is via the main supply line (2) feed back to the supplier system to be utilized by other consumers of thermal energy, or e.g.to the supplier of the thermal energy itself, like a district heating plant.
  • Fig. 5 shows an embodiment where cooling branch lines (35, 36) are connected to the local branch lines (13, 14) with a cooling branch supply line (35) connected to the first local branch line (14) and a cooling branch return line (36) connected to the second local branch line (13).
  • the cooling branch lines (35, 36) then would be connected to heat transferring devices adapted for cooling and may operate parallel to e.g. the local lines (4, 5)
  • the diversion valve (30) now is positioned at the first local branch line (13) enabling a selective connection between the thermal transfer unit (6), local return line (5) and cooling branch return line (36). Further a pump (15) is positioned in relation to the local return line (5) between the heat exchanger (9) and connection of the first local branch line (13) to the local return line (5), and a pump (15) is positioned on the first branch line (13) between the connection of the cooling branch supply line (35) and the thermal transfer unit (6). The two pumps (15) thus allow independent flow in the two circuits.
  • the embodiment allows both the heating and/or cooling of the heat demanding devices connected to the local lines (4, 5) as any of the previous embodiments, and the connected heat transferring devices adapted for cooling then is enable by supplying cooled fluid from the cold connection of the heat transferring unit (6) to be supplied via the second branch line (14), which then is returned to the heat transferring unit (6), now having a higher temperature by the cooling return line (36) and first local branch line (13).
  • cooling branch lines (35, 36) are used for quick heating of domestic use water and could thus be connected to tapping stations.
  • cooling branch lines (35, 36) are connected to a thermal reservoir (10) allowing heating or cooling fluid to be stored for later use, or e.g. for use for quick heating of domestic use water and could thus be connected to tapping stations.
  • Fig. 6 illustrates an embodiment where the thermal reservoir (10) replaces the heat exchanger (9) connected to the instantaneous lines (24, 25). Further, the second part (8) of the thermal transfer unit (6) is directly connected to the main branch lines (11 , 12).
  • This embodiment enables the direct transfer of thermal energy from the thermal transfer unit (6) to the main supply line (2), and selectively (e.g. by flow control valve 34) a selective heating of the fluid in the thermal reservoir (10), which in turn can be used for quick heating of devices, e.g. domestic water taps or other radiator or floor heating installations, where a fast supply of hot water is an advantage, and no cooling is required.
  • the thermal reservoir (10) could be positioned e.g. at a remote location relative to the thermal transfer unit (6).
  • Fig. 7 is basically the same as fig. 6, but where a first bypass line (41 ) interconnects the first main branch line (11 ) to the instantaneous return line (25) and a second bypass line (42) interconnects the second main branch line (12) to the instantaneous supply line (24).
  • a diversion valve (30) is positioned at the connection of the second bypass line (42) to the instantaneous supply line (24) allowing a selection of the supply of warm fluid from the thermal transfer unit (6) to the thermal reservoir (10) and/or the main supply line (2).
  • the heat emission part inside the thermal reservoir (10) can be a coil.
  • a further advantage with the setup is it requires a low hydraulic pressure of the pump (15) compared to working up against the differential pressure in the main lines (2, 3).
  • Fig. 8 is basically the same as fig. 7, but where the first (41 ) and second (42) bypass lines connect directly to the thermal reservoir (10), the first bypass line
  • a diversion valve (30) in this embodiment is positioned at the connection of the second bypass line (42) to the second main branch (12). This allows a selection of returning fluid from the thermal transfer unit (6) to the main supply line and/or to the thermal reservoir (10).
  • the heat emission part inside the thermal reservoir (10) can be a coil.
  • Fig. 9 discloses an embodiment where the thermal transfer unit (6) has no direct connection to the main lines (2, 3), but instead is connected to heat disposal means (45), such as a heat sink. This enables the removal of thermal energy extracted by the thermal transfer unit (6) feed e.g. to the air, removing it from the system if not required and e.g. no storage are available.
  • heat disposal means such as a heat sink.
  • the heat disposal means (45) embodiment could apply to any of the previous and following embodiments, and could be positioned in additional lines and may be activatable by flow control valves (34) or diversion valves (30) when disposing of thermal energy is required.
  • Fig. 10 is basically the same system (1 ) as fig. 1 and 2, but where the thermal reservoir (10) is replaced by a heat exchanger, the secondary side connected to the reheating lines (16, 17) and the primary side to the main branch lines (11 , 12).
  • Fig. 11 too is basically the same system (1 ) as fig. 1 and 2, but where the main (2,3) and local (4, 5) lines are directly connected, or the one being part of the other. This is a direct heating system.

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Abstract

The present invention relates to a heating system (1) comprising main lines (2, 3) with a main supply line (2) adapted to feed thermal energy to heat transferring devices by a main heating or cooling fluid, and main return line (3) 5 adapted to return cooled or heated heating fluid, where a hot connection of a second part (8) of a thermal transfer unit (6) via a second main branch line (12) is connected to the main supply line (2) and a second part (8) cold connection via a first main branch line (11) to the main return line (3) and where a cold connection of a first part (7) of the thermal transfer unit (6) is connected 10 upstream and a hot connection of the first part (7) is connected downstream of the heat transferring devices and where in the thermal transfer unit (6) thermal energy is transferred from fluid flowing from the first part (7) hot connection to cold connection and is transferred to the fluid flowing from the cold connection to the hot connection in the second part (8).

Description

HEATING NETWORK WITH HEATING AND COOLING APPLICABILITY
BACKGROUND
The background of this invention is to offer the service of cooling as an add on to the service of heating, or possible also cooling. In this way the thermal energy from the cooling can be utilized in e.g. the local heating system or in the area deployed district heating system. The service of cooling can be realized, based on one pair of area laid district heating pipes, compared to the traditional solution where a dedicated pair of district heating pipes and a dedicated pair of district cooling pipes are offering the service of heating and cooling in parallel. Further, a thermal storage tank enables the option of improved utilization of the produced heat for local use.
SUMMARY OF THE INVENTION
The objects are solved according to the system as indicated in the claims. This includes introducing a heating system comprising main lines with a main supply line adapted to feed thermal energy to heat transferring devices by a main heating or cooling fluid, and main return line adapted to return cooled or heated heating fluid, where a hot connection of a second part of a thermal transfer unit via a second main branch line is connected to the main supply line and a second part cold connection via a first main branch line to the main return line and where a cold connection of a first part of the thermal transfer unit is connected upstream and a hot connection of the first part is connected downstream of the heat transferring devices and where in the thermal transfer unit thermal energy is transferred from fluid flowing from the first part hot connection to cold connection and is transferred to the fluid flowing from the cold connection to the hot connection in the second part.
The thermal transfer unit may be adapted to transfer the thermal energy when the temperature of the second part cold connection is higher than the temperature of the first part hot connection.
The main lines may be in thermal connection to local lines via a heat exchanger including a local supply line to supply a local heating fluid to the heat transferring devices and a local return line returning fluid from the heat transferring devices back to the heat exchanger, wherein the local heating fluid is heated by thermal transfer from the main heating fluid in the heat exchanger.
The main lines may alternatively be directly connected to or forms part of local lines including a local supply line to supply a local heating fluid to the heat transferring devices and a local return line returning fluid from the heat transferring devices back to the main return line.
A first local branch line may connect the local return line to a hot connection of the first part of the thermal transfer unit and where a second local branch line connects to a first part cold connection, where the fluid in the hot connection has a higher temperature than the fluid in the cold connection.
Cooling branch lines may be connected to the local branch lines with a cooling branch supply line connected to the first local branch line and a cooling branch return line connected to the second local branch line, where the cooling branch lines (35, 36) is connected to heat transferring devices adapted for cooling.
The local return line may connect to the local return line by a diversion valve. In an embodiment cooling branch lines are connected to the local branch lines with a cooling branch supply line connected to the first local branch line and a cooling branch return line connected to the second local branch line, where the cooling branch lines are connected to devices adapted for cooling.
In an embodiment a thermal reservoir is in fluid connection to respectively the second part hot and cold connections. The thermal reservoir may further be connected to respectively the first and second main branch lines.
The thermal reservoir may further be connected to instantaneous lines with a first instantaneous line connecting the main supply line to a hot fluid connection and the second instantaneous line connecting the main return line to a cold fluid connection of the thermal reservoir.
The thermal reservoir may further be connected to the first main branch line by a first bypass line connecting it to the second instantaneous line and is connected to the second main branch line by a second bypass line connecting it to the first instantaneous line.
The thermal reservoir further may be connected to the first main branch line by a first bypass line and to the second main branch line by a second bypass line.
The heat disposal means may be connected to the heat transfer unit allowing the removal of thermal energy from e.g. the heating system.
The heating system may be adapted to operate in a heating mode where thermal energy is delivered to the heat demanding devices, and in a first cooling mode where thermal energy is removed from the heat demanding devices.
The heating system may further be adapted to operate in a second cooling mode where thermal energy is removed from the heat demanding devices and where thermal energy is feed back to the main supply line in a direction away from the heat transferring devices to be used by other consumers.
The present invention further relates to a cooling system similar to the heating system of any of the previous claims, but where the operation is reversed such that the heat transferring devices in thermal connection to the fluid in the main lines are adapted for cooling and the heating fluid is a cooling fluid, the main return line having a higher temperature than the main supply line, and where the heat transfer unit is adapted to transfer thermal heating to the cooling devices if a heating is required.
The thermal energy extracted may be used for quick heating of domestic use water and could thus be connected to tapping stations.
The present invention further relates to a method to operate a heating system comprising main lines with a main supply line adapted to feed thermal energy to heat transferring devices by a main heating fluid, and main return line adapted to return cooled heating fluid, where a hot connection of a second part of a thermal transfer unit via a first main branch line is connected to the main supply line and a second part cold connection via a second main branch line to the main return line and where a cold connection of a first part of the thermal transfer unit is connected upstream and a hot connection of the first part is connected downstream of the heat transferring devices and where in the thermal transfer unit thermal energy is transferred from fluid flowing from the first part hot connection to cold connection and is transferred to the fluid flowing from the cold connection to the hot connection in the second part, wherein the method includes for the thermal transfer unit to extract thermal energy from the heat demanding devices to enable them to operate in a first cooling mode. FIGURES
Fig. 1 A first embodiment of the heating circuit according to the present invention including a thermal transfer unit.
Fig. 2 An embodiment of the heating circuit in a heating mode supplying heat to heat transferring devices.
Fig. 3 An embodiment of the heating circuit in a first cooling mode where heat is extracted from the heat transferring devices and feed back to the main lines and/or a thermal reservoir.
Fig. 4 An embodiment of the heating circuit in a first cooling mode where heat is extracted from the heat transferring devices and feed back to the main lines, a heat exchanger and/or a thermal reservoir, and back to the heat supplying network and/or plant.
Fig. 5 An embodiment of the heating circuit adding a cooling circuit which can operate in parallel to the heating circuit.
Fig. 6 An embodiment of the heating circuit where a thermal reservoir is positioned at a different branch from the thermal transfer unit.
Fig. 7 An embodiment of the heating circuit where a thermal reservoir is positioned at a different branch from the thermal transfer unit, but where the branches are connected.
Fig. 8 Another embodiment of the heating circuit where a thermal reservoir is positioned at a different branch from the thermal transfer unit, but where the branches are connected. Fig. 9 An embodiment of the heating circuit where the thermal energy extracted is feed to an ambient sink.
Fig. 10 An embodiment of the heating circuit where a heat exchanger is positioned between the main lines and a thermal transfer unit.
Fig. 11 A first embodiment of the heating circuit according to the present invention including a thermal transfer unit with direct connection to the consumers.
DETAILED DESCRIPTION OF THE INVENTION
The detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration only.
Figure 1 illustrate a first embodiment of the present invention with a heating or cooling system (1 ) including main lines including a main supply line (2) and main return line (3). The main lines (2, 3) are adapted to feed thermal energy to heating transferring devices, such as floor heating/cooling installations, radiators, cooling fans etc. In the illustrated embodiment they via a heat exchanger (9) are in thermal connection to local lines including a local supply line (4) and local return line (5). In other embodiments the main (2,3) and local (4, 5) lines are directly connected, or the one being part of the other.
In the following the system (1 ) is described mainly as a heating system (1 ), and the heat transferring devices being heat consuming devices but the operation could be reversed, the heat transferring devices being cooling devices being supplied with a main cooling fluid adapted to remove thermal energy from a space by the cooling devices, and where the system (1 ) enables the transfer of thermal energy to the cooling devices if a heating is required.
In the illustrated embodiment a main heating fluid is feed from the main supply line (2) to a first flow path of the heat exchanger (9), also referred to as the primary side. A colder local heating fluid is feed to the second flow path of the heat exchanger, also referred to as the secondary side, by a local return line (5) and in the heat exchanger (9) thermal energy is transferred from the main to the local heating fluid. The now cooled main heating fluid is then returned by the main return line (3) and the heated local heating fluid is feed to the aby the local supply line (4). In the heat transferring devices thermal energy in the local heating fluid is used for cooling the fluid, which subsequently is returned by the local return line (5) to the heat exchanger (9).
A set of main branch lines (11 , 12) connects to a thermal reservoir or heat exchanger (10) (in the following predominantly referred to as thermal reservoir) with a first main branch line (11 ) to a cold fluid part, and with a second main branch line (12) to a hot fluid part. By cold and hot fluid means the fluid in the cold fluid part is colder than the fluid in the hot fluid part.
The first main branch line (11 ) in the illustrated embodiment thus connects the thermal reservoir (10) to the main return line (3) and the second branch line (12) connects the thermal reservoir (10) to the main return line (2).
A thermal transfer unit (6) is connected to the heating system (1 ) transferring thermal energy from a first part (7) to a second part (8) of the thermal transfer unit (6). The thermal transfer unit (6) is defined by being able of transfer thermal energy from a first fluid to a second fluid, the second fluid being hotter than the first, said thermal transfer unit (6) transferring thermal energy from a fluid in a first part (7) to a fluid in a second part (8) of the thermal transfer unit (6). The thermal transfer unit (6) may be a heat pump in the usual sense formed with the first part (7) e.g. being the cold part, or evaporator, and the second part (8) e.g. being the hot part, or condenser. Further it then would include a compressor (20) and expansion valve (21 ). An alternative thermal transfer unit (6) could e.g. be a Peltier element.
Local branch lines (13, 14) connect the thermal transfer unit (6) to the local lines (3, 4). In the illustrated embodiment, the second part (8) is connected to the local return line (5) by a first local branch line (13) and the local supply line (4) by a second local branch line (14).
A set of reheating lines (16, 17) connects the second fluid connection (8) to the thermal reservoir (10) with a first reheating line (16) connecting to the hot fluid part and the second reheating line (17) connecting to the cold fluid part. As illustrated the first reheating line (16) further connects to the second main branch line (12) and the second reheating line (17) to the first main branch line (11 ).
To drive the flows in the different lines, pumps (15) may be inserted where needed, such as where flow needs to be driven against a pressure difference like illustrate for the second main branch line (12), to drive fluid from the thermal reservoir (10) to the main supply line (2) having higher pressure than in the thermal reservoir (10).
In the illustrated embodiment a check valve (31 ) is inserted in the second main branch line (12) to prevent flow from the main supply line (2) to the thermal reservoir (10). The check valve (31 ) alternatively could be inserted in the first main branch line (11 ).
The heating system may further comprise flow control valves (34), temperature sensors (33) and pressure independent or pressure regulating valves (32) where required. A diversion valve (30), such as a 3-way valve, connects the local return line (5) to the first local branch line (13) to define the flow rate to the thermal transfer unit (6), such as to open and close the fluid connection.
In an embodiment instantaneous lines (24, 25) further are connected to the main lines (2, 3) e.g. through a heat exchanger (9) as illustrated, or a thermal reservoir.
The instantaneous lines (24, 25) in the illustration comprises an instantaneous supply line (24) and instantaneous return line (25) connected to the secondary side of the instantaneous heat exchanger (9), whereas the instantaneous heat exchanger (9) primary side is connected to the main supply line (2) and main return line (3) respectively.
The instantaneous lines (24, 25) are not directly connected to the thermal reservoir (10), and in an embodiment they connect to heat exchanging devices not adapted for cooling, but only for heating. In this embodiment, the heating consuming devices of the local lines (4, 5) are adapted for both cooling and heating, this e.g. being the floor heating installation, whereas the instantaneous lines (24, 25) connects to devices such as e.g. water taps for domestic water tapping, or other radiator or floor heating installations, where no cooling will be required
A flow control valve (34) may be positioned in relation to the thermal reservoir (10) connection to the first main branch line (11 ) and/or second reheating line (17) enabling to set the flow rate to the thermal reservoir (10) to a requirement, e.g. from the main return line (3) to replenish it, or simply to change the flow rate to meet a requirement.
Flow control valves (34), or as illustrated, pressure independent valve (32), positioned in relation to the reheating lines (16, 17), local branch lines (13, 14) and/or the main branch lines (11 , 12), may be in data exchange communication with temperature sensors (33) e.g. positioned in connection to the inlet or outlet connections of the first (7) and/or second (8) part. This allows the regulation of the respective flow rates if the temperatures get’s too high or low according to a setpoint, or range.
Fig. 2 is the same heating system (1 ) as fig. 1 but showing a heating mode where the local (4, 5) and instantaneous local (24, 25) lines are directly supplied with thermal energy from the main lines (2, 3) via heat exchangers (9). In this mode there are no circulation in the local branch lines (13, 14), the connection e.g. being closed by the diversion valve (30), and the thermal transfer unit (6) is inactive. Optionally the fluid connections (11 , 12, 16, 17) to the thermal reservoir are closed.
This heating mode is like an ordinary heating system, such as they are found in e.g. district heating, and is mainly adapted for heating purposes only.
Fig. 3 illustrates a first cooling mode where the secondary side connection to the heat exchanger (9) connecting to the local lines (4, 5) are closed, e.g. by the diversion valve (30) diverting the return fluid from the heat transferring devices to the first local branch line (13) rather than back to the heat exchanger (9).
In the illustration a pump (15) is positioned in relation to the local lines (4, 5) in a position allowing it to circulate fluid between the connected heat transferring devices and the heat exchanger (9) and/or the thermal transfer unit (6), or both, according to a selected mode, e.g. by the setting of the diversion valve (30). In the figure a pump (15) is positioned at the local return line (5) between the heat transferring devices and the connection of the second local branch line (13). Alternatively, it could have been positioned at the local supply line (4) between the connection to the first local branch line (14) and heat transferring devices.
The first local branch line (13) connects to the first part (7) of the thermal transfer unit (6) at a hot connection, whereas the second local branch line (14) connects to the first part (7) cold connection. By respectively cold and hot connection is referred to the fluid at the one connection be colder or hotter than at the other connection.
The second part (8) of the thermal transfer unit (6) connects with a hot connection to the hot fluid part of the thermal reservoir (10) by the first reheating line (16) and with a cold connection to the cold fluid part by a second reheating line (17). A pump (15) may be connected to e.g. the first reheating line (16) to circulate fluid.
Fluid is circulated in local lines (4, 5), connected heat transferring devices, the local branch lines (13, 14) and first part (7). As the local return line (5) is connected to the first part (7) hot connection, heat is extracted and via the thermal transfer unit (6) moved to the fluid in the first reheating line (16). The heat then could be feed to the thermal reservoir (10) to be stored for later use, and/or directly back to the main lines (2, 3) such as to the main supply line (2) adding thermal energy and heat to the heating procedures in the heat exchangers (9). Stored thermal energy in the thermal reservoir (10) then could be directed to the main supply line (2) when needed, or just requested. The pump (15) connected to the first main branch (12) allows for feeding the heated fluid from the thermal reservoir (10) and I or directly from the first reheating line (16) to the main supply line (2).
The second part (8) cold connection connects to the colder part of the thermal reservoir (10) for feeding cold fluid to be heated in the second part (8) by heat extracted from the fluid passing the first part (7). Fluid could also alternatively, or additionally, be extracted from the main return line (3), or this could be selectable. The thermal reservoir (10) could also be connected to a further fluid inlet allowing the supply of new fluid.
Thermal energy, or heat, are thereby extracted from the fluid supplied to the heat transferring devices connected to the local lines (4, 5), such as floor heating installations, radiators etc. The ambient temperature, e.g. room temperature and floor temperature of a living space where the heat transferring devices are installed, will exchange thermal energy with the fluid in the heat transferring devices. If this is warmer that the fluid, thermal energy will flow to the fluid, rather than from the fluid, and will therefore have a cooling effect on the e.g. living space. This thermal energy is then transferred via the thermal transfer unit (6) to the first reheating line (16).
Fig. 4 illustrates a second cooling mode where a part of the thermal energy from the cooling in the local lines (4, 5) and extracted via the thermal transfer unit (6) is feed partly as thermal energy supplied to the heat exchanger (9) separating the main lines (2, 3) from the local lines (4, 5), and part is via the main supply line (2) feed back to the supplier system to be utilized by other consumers of thermal energy, or e.g.to the supplier of the thermal energy itself, like a district heating plant.
Fig. 5 shows an embodiment where cooling branch lines (35, 36) are connected to the local branch lines (13, 14) with a cooling branch supply line (35) connected to the first local branch line (14) and a cooling branch return line (36) connected to the second local branch line (13). The cooling branch lines (35, 36) then would be connected to heat transferring devices adapted for cooling and may operate parallel to e.g. the local lines (4, 5)
In further difference to the embodiments of figs. 1 -4 the diversion valve (30) now is positioned at the first local branch line (13) enabling a selective connection between the thermal transfer unit (6), local return line (5) and cooling branch return line (36). Further a pump (15) is positioned in relation to the local return line (5) between the heat exchanger (9) and connection of the first local branch line (13) to the local return line (5), and a pump (15) is positioned on the first branch line (13) between the connection of the cooling branch supply line (35) and the thermal transfer unit (6). The two pumps (15) thus allow independent flow in the two circuits. The embodiment allows both the heating and/or cooling of the heat demanding devices connected to the local lines (4, 5) as any of the previous embodiments, and the connected heat transferring devices adapted for cooling then is enable by supplying cooled fluid from the cold connection of the heat transferring unit (6) to be supplied via the second branch line (14), which then is returned to the heat transferring unit (6), now having a higher temperature by the cooling return line (36) and first local branch line (13).
In one embodiment the cooling branch lines (35, 36) are used for quick heating of domestic use water and could thus be connected to tapping stations.
In one embodiment the cooling branch lines (35, 36) are connected to a thermal reservoir (10) allowing heating or cooling fluid to be stored for later use, or e.g. for use for quick heating of domestic use water and could thus be connected to tapping stations.
Fig. 6 illustrates an embodiment where the thermal reservoir (10) replaces the heat exchanger (9) connected to the instantaneous lines (24, 25). Further, the second part (8) of the thermal transfer unit (6) is directly connected to the main branch lines (11 , 12).
This embodiment enables the direct transfer of thermal energy from the thermal transfer unit (6) to the main supply line (2), and selectively (e.g. by flow control valve 34) a selective heating of the fluid in the thermal reservoir (10), which in turn can be used for quick heating of devices, e.g. domestic water taps or other radiator or floor heating installations, where a fast supply of hot water is an advantage, and no cooling is required. The thermal reservoir (10) could be positioned e.g. at a remote location relative to the thermal transfer unit (6).
Fig. 7 is basically the same as fig. 6, but where a first bypass line (41 ) interconnects the first main branch line (11 ) to the instantaneous return line (25) and a second bypass line (42) interconnects the second main branch line (12) to the instantaneous supply line (24). A diversion valve (30) is positioned at the connection of the second bypass line (42) to the instantaneous supply line (24) allowing a selection of the supply of warm fluid from the thermal transfer unit (6) to the thermal reservoir (10) and/or the main supply line (2). The heat emission part inside the thermal reservoir (10) can be a coil.
A further advantage with the setup is it requires a low hydraulic pressure of the pump (15) compared to working up against the differential pressure in the main lines (2, 3).
Fig. 8 is basically the same as fig. 7, but where the first (41 ) and second (42) bypass lines connect directly to the thermal reservoir (10), the first bypass line
(41 ) at a section with fluid at a higher temperature than the second bypass line
(42). A diversion valve (30) in this embodiment is positioned at the connection of the second bypass line (42) to the second main branch (12). This allows a selection of returning fluid from the thermal transfer unit (6) to the main supply line and/or to the thermal reservoir (10). The heat emission part inside the thermal reservoir (10) can be a coil.
Again, this has the advantage to require a low hydraulic pressure of the pump (15) compared to working up against the differential pressure in the main lines (2, 3). Further, it allows the thermal transfer unit (6) to be fully separated from direct connection to the main supply line (2).
Fig. 9 discloses an embodiment where the thermal transfer unit (6) has no direct connection to the main lines (2, 3), but instead is connected to heat disposal means (45), such as a heat sink. This enables the removal of thermal energy extracted by the thermal transfer unit (6) feed e.g. to the air, removing it from the system if not required and e.g. no storage are available.
The heat disposal means (45) embodiment could apply to any of the previous and following embodiments, and could be positioned in additional lines and may be activatable by flow control valves (34) or diversion valves (30) when disposing of thermal energy is required.
Fig. 10 is basically the same system (1 ) as fig. 1 and 2, but where the thermal reservoir (10) is replaced by a heat exchanger, the secondary side connected to the reheating lines (16, 17) and the primary side to the main branch lines (11 , 12).
This would be a way to hydraulically separate the lines (16, 16) and main supply lines (2, 3), but would not allow storage of the thermal energy, it would be transferred directly from the thermal transfer unit (6) to the main supply line (2).
Fig. 11 too is basically the same system (1 ) as fig. 1 and 2, but where the main (2,3) and local (4, 5) lines are directly connected, or the one being part of the other. This is a direct heating system.
References:
1 - Heating system
2 - Main supply line
3 - Main return line
4 - Local supply line
5 - Local return line
6 - thermal transfer unit
7 - first part (of the thermal transfer unit) - the cold part, or evaporator
8 - second part (of the thermal transfer unit) - the hot part, or condenser
9 - Heat exchanger
10 - Thermal reservoir
11 - First main branch line - Second main branch line
- First local branch line
- Second local branch line
- Pump
- First reheating line
- Second reheating line
- Compressor
- Expansion valve
- Instantaneous supply line
- Instantaneous return line
- Diversion valve/three-way valve
- Check valve
- Pressure independent valve I pressure controller
- Temperature sensor
- Flow control valve
- Cooling branch supply line
- Cooling branch return line
- First bypass line
- Second bypass line
- Heat disposal means / heat sink

Claims

1. Heating system (1 ) comprising main lines (2, 3) with a main supply line (2) adapted to feed thermal energy to heat transferring devices by a main heating or cooling fluid, and main return line (3) adapted to return cooled or heated heating fluid, where a hot connection of a second part (8) of a thermal transfer unit (6) via a second main branch line (12) is connected to the main supply line (2) and a second part (8) cold connection via a first main branch line (11 ) to the main return line (3) and where a cold connection of a first part (7) of the thermal transfer unit (6) is connected upstream and a hot connection of the first part (7) is connected downstream of the heat transferring devices and where in the thermal transfer unit (6) thermal energy is transferred from fluid flowing from the first part (7) hot connection to cold connection and is transferred to the fluid flowing from the cold connection to the hot connection in the second part (8).
2. Heating system (1 ) according to claim 1 , wherein the thermal transfer unit (6) is adapted to transfer the thermal energy when the temperature of the second part (8) cold connection is higher than the temperature of the first part (7) hot connection.
3. Heating system (1 ) according to claim 1 or 2, wherein the main lines (2, 3) are in thermal connection to local lines (4, 5) via a heat exchanger (9) including a local supply line (4) to supply a local heating fluid to the heat transferring devices and a local return line (5) returning fluid from the heat transferring devices back to the heat exchanger (9), wherein the local heating fluid is heated by thermal transfer from the main heating fluid in the heat exchanger (9).
4. Heating system (1 ) according to claim 1 or 2, wherein the main lines (2, 3) are directly connected to or forms part of local lines (4, 5) including a local supply line (4) to supply a local heating fluid to the heat transferring devices and a local return line (5) returning fluid from the heat transferring devices back to the main return line (3).
5. Heating system (1 ) according to claim 3 or 4, wherein a first local branch line 13) connects the local return line (5) to a hot connection of the first part (7) of the thermal transfer unit (6) and where a second local branch line (14) connects to a first part (7) cold connection, where the fluid in the hot connection has a higher temperature than the fluid in the cold connection.
6. Heating system (1 ) according to claim 5, wherein cooling branch lines (35, 36) are connected to the local branch lines (13, 14) with a cooling branch supply line (35) connected to the first local branch line (14) and a cooling branch return line (36) connected to the second local branch line (13), where the cooling branch lines (35, 36) is connected to heat transferring devices adapted for cooling.
7. Heating system according to claim 3, 4, 5 or 6, wherein the local return line (13) connects to the local return line (5) by a diversion valve (30).
8. Heating system (1 ) according to any of claims 3-7, wherein cooling branch lines (35, 36) are connected to the local branch lines (13, 14) with a cooling branch supply line (35) connected to the first local branch line (14) and a cooling branch return line (36) connected to the second local branch line (13), where the cooling branch lines (35, 36) are connected to devices adapted for cooling.
9. Heating system (1 ) according to any of the previous claims, wherein a thermal reservoir (10) is in fluid connection (16, 17) to respectively the second part (8) hot and cold connections.
10. Heating system (1 ) according to claim 7, wherein the thermal reservoir (10) further is connected to respectively the first (11 ) and second (12) main branch lines. 19
11. Heating system (1 ) according to claim 9, wherein the thermal reservoir (10) further is connected to instantaneous lines (24, 25) with a first instantaneous line (24) connecting the main supply line (2) to a hot fluid connection and the second instantaneous line (25) connecting the main return line (3) to a cold fluid connection of the thermal reservoir (10).
12. Heating system (1 ) according to claim 10, wherein the thermal reservoir (10) further is connected to the first main branch line (11 ) by a first bypass line (41 ) connecting it to the second instantaneous line (25) and is connected to the second main branch line (12) by a second bypass line (42) connecting it to the first instantaneous line (24).
13. Heating system (1 ) according to claim 10, wherein the thermal reservoir (10) further is connected to the first main branch line (11 ) by a first bypass line (41 ) and to the second main branch line (11 ) by a second bypass line (42).
14. Heating system (1 ) according to any of the previous claims, wherein heat disposal means (45) is connected (11 , 12) to the heat transfer unit (6) allowing the removal of thermal energy from the heating system (1 ).
15. Heating system (1 ) according to any of the previous claims, wherein the heating system (1 ) is adapted to operate in a heating mode where thermal energy is delivered to the heat demanding devices, and in a first cooling mode where thermal energy is removed from the heat demanding devices.
16. Heating system (1 ) according to claim 8, wherein the heating system (1 ) further is adapted to operate in a second cooling mode where thermal energy is removed from the heat demanding devices and where thermal energy is feed back to the main supply line (2) in a direction away from the heat transferring devices to be used other consumers. 20
17. Cooling system (1 ) similar to the heating system (1 ) of any of the previous claims, but where the operation is reversed such that the heat transferring devices in thermal connection to the fluid in the main lines (2, 3) are adapted for cooling and the heating fluid is a cooling fluid, the main return line (3) having a higher temperature than the main supply line (2), and where the heat transfer unit (6) is adapted to transfer thermal cooling to the cooling devices if a heating is required.
18. Cooling system (1 ) according to claim 17, wherein the thermal energy extracted are used for quick heating of domestic use water and could thus be connected to tapping stations.
19. Method to operate a heating system (1 ) comprising main lines (2, 3) with a main supply line (2) adapted to feed thermal energy to heat transferring devices by a main heating fluid, and main return line (3) adapted to return cooled heating fluid, where a hot connection of a second part (8) of a thermal transfer unit (6) via a first main branch line (11 ) is connected to the main supply line (2) and a second part (8) cold connection via a second main branch line (12) to the main return line (3) and where a cold connection of a first part (7) of the thermal transfer unit (6) is connected upstream and a hot connection of the first part (7) is connected downstream of the heat transferring devices and where in the thermal transfer unit (6) thermal energy is transferred from fluid flowing from the first part (7) hot connection to cold connection and is transferred to the fluid flowing from the cold connection to the hot connection in the second part (8), wherein the method includes for the thermal transfer unit (6) to extract thermal energy from the heat demanding devices to enable them to operate in a first cooling mode.
PCT/EP2022/086406 2021-12-17 2022-12-16 Heating network with heating and cooling applicability WO2023111291A1 (en)

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DKPA202101214 2021-12-17

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008014204A1 (en) * 2007-04-25 2008-10-30 Fachhochschule München Drinking water heating system for a number of business units, households or similar consumers has two-stage throughflow principle for achieving low return temperatures for large supply unit
EP3569936A1 (en) * 2018-05-17 2019-11-20 Danfoss A/S Domestic water re-heating
EP3851748A1 (en) * 2020-01-16 2021-07-21 E.ON Sverige AB Thermal energy extraction assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008014204A1 (en) * 2007-04-25 2008-10-30 Fachhochschule München Drinking water heating system for a number of business units, households or similar consumers has two-stage throughflow principle for achieving low return temperatures for large supply unit
EP3569936A1 (en) * 2018-05-17 2019-11-20 Danfoss A/S Domestic water re-heating
EP3851748A1 (en) * 2020-01-16 2021-07-21 E.ON Sverige AB Thermal energy extraction assembly

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