EP3671051A1 - Kontrollverfahren des rücklaufs der sanitärwasserzirkulation für warmwassererzeugungssystem - Google Patents

Kontrollverfahren des rücklaufs der sanitärwasserzirkulation für warmwassererzeugungssystem Download PDF

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Publication number
EP3671051A1
EP3671051A1 EP19217301.1A EP19217301A EP3671051A1 EP 3671051 A1 EP3671051 A1 EP 3671051A1 EP 19217301 A EP19217301 A EP 19217301A EP 3671051 A1 EP3671051 A1 EP 3671051A1
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EP
European Patent Office
Prior art keywords
tank
temperature
return
aux
circulation
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.)
Granted
Application number
EP19217301.1A
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English (en)
French (fr)
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EP3671051B1 (de
Inventor
Arnaud BECQ
David CHEZE
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Publication of EP3671051A1 publication Critical patent/EP3671051A1/de
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    • 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
    • F24D17/0078—Recirculation systems
    • 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
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/32—Heat sources or energy sources involving multiple heat sources in combination or as alternative heat sources

Definitions

  • the invention relates to the field of domestic hot water (DHW) production systems by intermittent heat source (solar thermal, industrial waste heat recovery system ).
  • DHW domestic hot water
  • intermittent heat source solar thermal, industrial waste heat recovery system
  • FIG. 1 A common architecture for a centralized system (1) for producing domestic hot water (DHW) preheated by an intermittent heat source is illustrated in figure 1 , with its regulation device.
  • DHW domestic hot water
  • the cold water circuit is represented by short dashed lines
  • the lukewarm water circuit is represented by short-long dashed lines
  • the water circuit hot is represented by long ones.
  • the dotted lines correspond to data transmission lines of the control device.
  • the cold water for example from a cold water source 19, such as the drinking water distribution network, is first heated by the intermittent source 20, if that -it is active (sun present, ).
  • the heating is finalized in the backup tank 12 until the water reaches the set temperature T cons at the sensor 32 measuring T aux , the temperature of the water in the backup tank 12.
  • a differential temperature setpoint ⁇ T aux substantially equal to 4K makes it possible to avoid short heating cycles of the booster tank 12.
  • a regulation according to this setpoint is shown diagrammatically in figure 2 . More particularly, as a function of the value of a temperature difference between the set temperature T cons and the temperature T aux of the water in the booster tank 12, the regulation device requests or does not request the booster tank 12. More particularly, the booster tank 12 is activated when T cons - T aux ⁇ ⁇ T aux , with ⁇ T aux >0; otherwise, the booster balloon 12 is not used.
  • the auxiliary tank 12 can take different forms: gas boiler, biomass, fuel, heat pump, electrical resistance, ...
  • the preheating tank 11 and the backup tank 12 are each connected to a heat exchanger 17, 18 which can be external or internal to the tank.
  • a temperature control 5 is generally placed at the outlet of the booster tank 12 to ensure a constant temperature at the DHW distributed at the draw-off points 2 and limit the risk of burns.
  • Two types of hydraulic components 5 allow this control: thermostatic mixing valves and motorized three-way valves. Such a hydraulic component makes it possible to mix, if necessary and in controlled proportions, cold water coming directly from the distribution network 19 of sanitary water and the DHW coming from the auxiliary tank 12.
  • the centralized systems 1 are usually provided with a sanitary loop 13 which ensures a permanent circulation of hot water from the production installation to the draw-off points 2.
  • This circulation is represented by the solid black arrows on the figure 1 .
  • User comfort is thus quickly reached, but the heat losses in this loop 13 can be very large (of the same order of magnitude as the need).
  • the loopback is directed only to the booster tank 21 whose heating is engaged to bring the water to a sufficient temperature.
  • the intermittent source 20 When intermittent production is important, such as in summer for solar, it may be advantageous to use the intermittent source 20 to compensate for the heat losses in the sanitary circulation 13. This can be done, as shown in the figure 1 , by adding a three-way valve 4 to the DHW circulation return. The usual rule for controlling this three-way valve is shown on the figure 3 . According to this rule, if the loopback can cool the preheating balloon 11 (which can therefore recover more heat from the intermittent source 20), then the loopback is sent to this balloon 11. Otherwise, it is injected into the booster tank 12.
  • the loopback return is sent to the preheating tank 11. Otherwise, the rule provides two alternatives: if the difference between the temperature T pre of the water stored in the preheating tank 11 and the temperature T ret for loopback is less than a predetermined minimum threshold value ⁇ T up positive, then the loopback is sent to the booster tank 12; otherwise, the regulation of the DHW production system 1 is retained, in the sense that it is not modified from what it was before carrying out the temperature measurements T pre and T ret considered to control the three-way valve 4.
  • This technique makes it possible to recover more heat at the level of the preheating balloon 11 and therefore to improve the primary energy savings compared to a heating system of the auxiliary gas balloon only.
  • the risks of overheating are reduced, which ensures a longer service life for the installation.
  • the regulating device comprising, according to the aforementioned regulating method, a loop back to the preheating tank 11 and to the booster tank 12 therefore seems relatively satisfactory, in terms of primary energy savings, at least compared to to a gas system only, and in terms of increasing the service life of the system 1.
  • An object of the present invention is therefore to propose a method for regulating the return to sanitary circulation for a domestic hot water production system (DHW) comprising a preheating tank, which is even more optimized.
  • DHW domestic hot water production system
  • the present invention provides a process for controlling the return of sanitary circulation for a domestic hot water production system (DHW).
  • the production system comprises at least: a preheating tank, an auxiliary tank configured to be alternately stopped and running, and a sanitary loop configured to ensure a permanent circulation of hot water between the production system and at least one drawing point, preferably a plurality of drawing points.
  • the sanitary circulation is configured to be connected, in return for circulation, alternately to the preheating tank and to the auxiliary tank.
  • the sanitary loop return is more particularly connected to the preheating tank and to the booster tank by three pipes and a hydraulic component configured between these three pipes to ensure the circulation of water between a first of the three pipes, and in particular a return loop return pipe, and one or the other of the two other pipes, or the two other pipes at the same time, each of said two other pipes connecting the hydraulic component to a respective one among the preheating balloon and the booster ball.
  • the setpoint T cons of the temperature of the water in the booster tank is for example substantially equal to 60 ° C.
  • control method as introduced above thus allows, on the one hand to recover more intermittent heat and at a better efficiency than with the previous rule, on the other hand to use the energy stored in the balloon preheating in an optimized way in energy terms.
  • the benefits of the control process as introduced above come from each of these two aspects.
  • the present invention relates to a computer program product or to a non-transient medium readable by a computer, comprising instructions, which when carried out by at least one processor, implement the steps of control method as introduced above.
  • the regulation device is configured to implement the control method as introduced above.
  • the present invention relates to a production system as introduced above and configured to implement the method as introduced above.
  • “Lower” and “upper” mean “lower or equal” and higher or equal “, respectively. Equality is excluded by the use of the terms “strictly lower” and “strictly higher”. Also, expressions of the “equal, lower, higher” type are understood to mean comparisons which can accommodate certain tolerances, in particular according to the scale of magnitude of the compared values and the measurement uncertainties. Substantially equal, lower or higher values may enter into the interpretation of the invention.
  • a parameter "substantially equal / greater / less than” means a given value that this parameter is equal / greater / less than the given value, more or less 20%, or even more or less 10%, near this value.
  • a parameter “substantially between” two given values is meant that this parameter is at least equal to the smallest given value, more or less 20%, or even more or less 10%, close to this value, and at most equal to the largest given value, plus or minus 20%, or even plus or minus 10%, near this value.
  • Mating valve is understood to mean a mixing valve, for example at a valve having at least two inlets and a fluid outlet and comprising means for adjusting the respective proportion of the two inlets in the mixed fluid outlet, configured to regulate the flow rate and the temperature of a mixture of hot and cold water.
  • the present invention relates to a process for controlling or equivalent regulation of a domestic hot water production system, in particular of the type illustrated in figure 4 , comprising a sanitary loop 13.
  • the sanitary loop return is more particularly connected to the preheating tank 11 and to the auxiliary tank 12 by three pipes and a hydraulic component 4 configured between these three pipes to ensure, at all times, circulation water between a first of the three pipes, and in particular a return return outlet pipe, and one or the other of the two other pipes, or the two other pipes at the same time, each of said two other pipes connecting the hydraulic component 4 to a respective one among the preheating tank 11 and the booster tank 12.
  • the high-temperature water is brought to the level of the hot inlet of a mixing valve 5 at the outlet of the auxiliary tank 12 and upstream of the sanitary loop return.
  • the latter adapts the portion of hot and cold water from the drinking water distribution network 19 so as to ensure a constant temperature at the start of the DHW, usually set at 55 ° C., towards the draw-off points. 2.
  • the booster tank 12 is either running or stopped, and the loopback is connected either to the preheating tank 11, or to the booster tank 12.
  • the booster tank is said to be “in operation” when it is controlled so as to heat the water it contains; it is said to be “stopped” when it is not used to heat the water it contains.
  • the control method can thus be implemented at regular, even periodic, time intervals, for example at time intervals substantially equal to 10 s.
  • the difference ⁇ T up - ⁇ T down between the maximum positive threshold value ⁇ T up and the minimum threshold value ⁇ T down is preferably between 5 ° C and 15 ° C, and is preferably substantially equal to 10 ° C. Consequently, the minimum threshold value ⁇ T down can be substantially equal to 0 ° C and the maximum positive threshold value ⁇ T up can be substantially equal to 10 ° C. It is observed that it is thus possible according to the preferred embodiment of the control method according to the invention to double the value of the difference ⁇ T up - ⁇ T down compared to the regulation method according to the prior art.
  • the control method 100 thus makes it possible to request the booster tank 12 less frequently, so that its service life is advantageously increased.
  • this value substantially equal to 10 ° C of the difference ⁇ T up - ⁇ T down that the best balance between energy saving and preservation of the installation seems to be achieved.
  • the booster tank 12 would be more frequently used; while for a value of this difference substantially equal to 15 ° C, the loopback on the preheating balloon 11 would not allow optimal intermittent energy recovery, even satisfactory.
  • the positive auxiliary threshold value ⁇ T aux is between 1 and 10 K, and is preferably substantially equal to 4 K.
  • the method according to this last characteristic also makes it possible to avoid frequent ignitions of the booster tank 12. The the life of the booster tank 12 is further increased.
  • a controller 14, 15, 1415, 1516, 141516 is further configured to control 105 ′, 112, 113 alternately stopping and lighting the booster tank 12.
  • the method according to the invention makes it possible to improve, for the system studied (and illustrated on the figure 4 ), 1% energy savings linked to the use of the solar resource.
  • the risk of overheating of the installation, and in particular of the preheating balloon 11 remains overall the same with the control method 100 according to the invention compared to what was obtained with the regulation according to the prior art.
  • the control method 100 according to the invention remains applicable regardless of the architecture of the DHW production system 1 used as long as it includes an intermittent source and a backup.
  • the control method 100 according to the invention can provide that a functional communication between at least two of these regulators is implemented.
  • a production system 1 as illustrated in the figure 6 can be considered in which the backup controller 15 and the sanitary loop controller 16 form one and the same controller 1516.
  • control method 100 can also be applied to systems with a single storage tank 1112, frequent in the case of small installations (less than 20 m 2 of sensors).
  • the system 1 operates in the same way as previously, the only difference being that the preheating is limited to the bottom of the balloon 1112 and the addition to the top.
  • control method 100 can be applied to installations with multiple preheating cylinders, whether they are connected in series, as shown in figure 8 or in parallel as shown in figure 9 .
  • control method 100 gives the possibility of using a system 1 as shown in the figure 10 which, compared to the system shown in the figure 6 , does not include a mixer 5 at the outlet of the booster tank 12.
  • the regulation on the three-way valve 4 makes it possible to maintain a temperature at more or less constant (fixed at T cons ) at the outlet of the booster tank 12.
  • An additional temperature control is not necessarily necessary. There are, however, some cycles where the temperature at level 2 is high (above 65 ° C), but these can be managed by the temperature limiter always present at point 2.
  • the savings in savings energy caused by the control method 100 according to the invention is then 3%. In this sense, the mixer 5 has not been shown on the figures 8 and 9 ; this lack of representation could also have affected figures 1 , 4 and 7 .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Dispensing Beverages (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
EP19217301.1A 2018-12-21 2019-12-18 Kontrollverfahren des rücklaufs der sanitärwasserzirkulation für warmwassererzeugungssystem Active EP3671051B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1873954A FR3090828B1 (fr) 2018-12-21 2018-12-21 Procédé de contrôle du retour de bouclage sanitaire pour un système de production d’eau chaude sanitaire

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EP3671051A1 true EP3671051A1 (de) 2020-06-24
EP3671051B1 EP3671051B1 (de) 2021-10-06

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EP (1) EP3671051B1 (de)
FR (1) FR3090828B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112128990A (zh) * 2020-09-01 2020-12-25 华帝股份有限公司 一种水路系统的控制方法、水路系统及零冷水换热设备
CN113701355A (zh) * 2021-08-24 2021-11-26 广东万和新电气股份有限公司 燃气热水系统及其控制方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006016419U1 (de) * 2006-10-26 2007-02-08 BTD Behältertechnik Heiz- und Trinkwassersysteme GmbH & Co. KG Vorrichtung zur Aufheizung eines Vorwärmspeichers mit alternativer Energie
FR2936042A1 (fr) * 2008-09-17 2010-03-19 Heliopac Procede et installation pour la distribution d'eau chaude sanitaire
DE102016102718A1 (de) * 2016-02-16 2017-08-17 Hoval Aktiengesellschaft Trinkwassererwärmungssystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006016419U1 (de) * 2006-10-26 2007-02-08 BTD Behältertechnik Heiz- und Trinkwassersysteme GmbH & Co. KG Vorrichtung zur Aufheizung eines Vorwärmspeichers mit alternativer Energie
FR2936042A1 (fr) * 2008-09-17 2010-03-19 Heliopac Procede et installation pour la distribution d'eau chaude sanitaire
DE102016102718A1 (de) * 2016-02-16 2017-08-17 Hoval Aktiengesellschaft Trinkwassererwärmungssystem

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112128990A (zh) * 2020-09-01 2020-12-25 华帝股份有限公司 一种水路系统的控制方法、水路系统及零冷水换热设备
CN112128990B (zh) * 2020-09-01 2022-02-08 华帝股份有限公司 一种水路系统的控制方法、水路系统及零冷水换热设备
CN113701355A (zh) * 2021-08-24 2021-11-26 广东万和新电气股份有限公司 燃气热水系统及其控制方法
CN113701355B (zh) * 2021-08-24 2023-03-24 广东万和新电气股份有限公司 燃气热水系统及其控制方法

Also Published As

Publication number Publication date
EP3671051B1 (de) 2021-10-06
FR3090828B1 (fr) 2021-01-08
FR3090828A1 (fr) 2020-06-26

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