FR3031575A1 - Thermal transfer module with associated regulation for thermodynamic system for hot water production - Google Patents

Thermal transfer module with associated regulation for thermodynamic system for hot water production Download PDF

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Publication number
FR3031575A1
FR3031575A1 FR1550212A FR1550212A FR3031575A1 FR 3031575 A1 FR3031575 A1 FR 3031575A1 FR 1550212 A FR1550212 A FR 1550212A FR 1550212 A FR1550212 A FR 1550212A FR 3031575 A1 FR3031575 A1 FR 3031575A1
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France
Prior art keywords
balloon
transfer module
water
hot
circuit
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Granted
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FR1550212A
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French (fr)
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FR3031575B1 (en
Inventor
Xiang Zheng
Mingliang Zhou
Donatien Martin
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LACAZE ENERGIES
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LACAZE ENERGIES
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00Domestic hot-water supply systems
    • F24D17/02Domestic hot-water supply systems using heat pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00Domestic hot-water supply systems
    • F24D17/0089Additional heating means, e.g. electric heated buffer tanks or electric continuous flow heaters, located close to the consumer, e.g. directly before the water taps in bathrooms, in domestic hot water lines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2240/00Characterizing positions, e.g. of sensors, inlets, outlets
    • F24D2240/26Vertically distributed at fixed positions, e.g. multiple sensors distributed over the height of a tank, or a vertical inlet distribution pipe having a plurality of orifices

Abstract

The thermal transfer module comprises: - a hot inlet (32), - a cold outlet (34), - a cold inlet (28), and - a hot outlet (30). The proposed system (transfer module and associated balloon) ) comprises: - a bypass (36) made downstream of the hot outlet (30), between the heat transfer module and the balloon (2), so as to obtain at least two branches (38, 40), each branch ( 38, 40) feeding the balloon (2) at feed points (16, 18) arranged at different heights; - regulating means for regulating a flow of water in each branch (38, 40); temperature sensors, and - management and control means are connected to the temperature sensors and the flow control means.

Description

The present invention relates to a thermal transfer module with associated regulation for thermodynamic system for producing domestic hot water. The field of the present invention is more particularly that of heating water in a flask, in particular a hot water tank, commonly called by its acronym ECS. To produce hot water, it is known to equip a balloon with integrated heating means such as for example one (or more) electrical resistance (s) or a gas burner. When the flask is filled with water, the heating means are turned on and the water heats up. This type of equipment is not suitable for example for heating from a heat pump or a solar collector. For such heat sources, it is known to use a heat exchanger. It is then known to pass a coil of the primary circuit in the hot water tank. It is also known to have a primary circuit, for example in a heat pump or with a solar collector, and a secondary circuit with the water to be heated, a transfer module ensuring the passage of calories from the primary circuit to the secondary circuit. The field of the invention thus relates to such a transfer module, for example between a heat pump and a hot water tank. More generally, such a transfer module can find its place between a heat production system, preferably from renewable energies. Such a transfer module can be used in various sectors and especially in the tertiary sector, for residences, for small and medium industries, etc. It is known, for example for collective housing, or small or medium industries, directly produce hot water on demand. The commercialized systems comprise a primary circuit connected directly to the production of heat and a secondary hot water circuit, the primary circuit and the secondary circuit being connected by a transfer module. Such systems generally do not have temperature control on the secondary circuit. It is then necessary to size the hot water production system to cope with a peak of consumption. This leads to oversizing the system to meet very specific needs. Such a system also leads to significant heat losses. Due to oversizing, we also arrive at a bulky and expensive balloon.

It is known to perform regulation on the primary circuit with a three-way valve used for regulation. There is then an expensive system associating within a complex balloon a storage tank and a production tank. In addition, such a system operates in instant production mode (production on demand) and has the same disadvantages as those mentioned above: oversizing, significant losses, high cost of equipment. It should also be noted that the production of collective sanitary hot water requires the rapid supply of hot water at any point of distribution of the circuit. For this purpose, a looped distribution circuit is made and maintained at temperature. This maintenance is energy intensive and energy consumption to maintain water temperature in the looped circuit may be sometimes more important than the production of hot water itself. The object of the present invention is therefore to provide a system for producing domestic hot water that is particularly well suited to using renewable energies whose efficiency is increased compared with systems known from the prior art. Preferably, the cost price of a system embodying the invention will be limited by using in particular a "simple" balloon, that is to say with a single tank and without special equipment.

To this end, the present invention proposes a thermal transfer module between a first circuit called primary circuit and a second circuit called secondary circuit, and balloon associated with a lower part and an upper part disposed above said lower part, said transfer module comprising: - an input called hot input intended to be connected to the primary circuit, - a so-called cold output output connected within the module to the hot input and intended to provide a return to the primary circuit, 3031575 3 - an input called cold input connected to the lower part of the balloon, and - a so-called hot output output connected within the module to the cold input and connected to the upper part of the balloon. According to the present invention, a bypass is carried out downstream of the hot outlet, between the heat transfer module and the balloon, so as to obtain at least two branches, each branch supplying the balloon at feed points arranged at different points. distinct heights; regulating means are provided for regulating a flow of water in each branch; temperature sensors are arranged, on the one hand, in the flask to determine in the flask at at least two distinct heights a water temperature in the flask and, on the other hand, upstream of the bypass, and management and control means are connected to the temperature sensors and the flow control means. With such a system, it is possible to create a secondary circuit with at least two separate inputs at different heights in the hot water tank. It is therefore possible to regulate the hot water supply of the balloon depending, on the one hand, the temperature of the water that supplies the balloon and the temperature in the balloon. In this system, it can be provided that the means for regulating the flow of water in each branch are in each case a solenoid valve. It is possible to provide a two-way solenoid valve in each branch or to provide at the level of the bypass at least one three-way solenoid valve as a function of the number of branches provided. To know the temperature in the flask without having too many sensors, it is preferably provided that the flask comprises a temperature sensor at the bottom and a temperature sensor associated with each feed point by the branches, except for the upper feeding point. For better regulation of the temperature of the system, the latter advantageously comprises a short-circuit which makes it possible to pass water leaving the hot outlet to the cold inlet without passing through the balloon and comprising control means for controlling the flow of water in said short circuit.

A heat transfer module and associated balloon as described above are also suitable when they further comprise a looped distribution circuit. The latter can then be fed, on the one hand, from the hot outlet, upstream of the bypass and, on the other hand, from an outlet 5 disposed in the upper position on the balloon. The present invention also relates to a system for producing hot water, characterized in that it comprises a heat transfer module and an associated balloon as described above. In such a system, a heat pump may be connected, on the one hand, to the hot inlet and, on the other hand, to the cold outlet of the heat transfer module. For such an application, the heat pump is preferably an air / water type heat pump because it makes it possible to obtain relatively high outlet water temperatures. Details and advantages of the present invention will become more apparent from the following description with reference to the accompanying diagrammatic drawing in which: FIG. 1 is a schematic view of a hot water production system incorporating a heat transfer module and an associated balloon according to the present invention, FIG. 2 is a view similar to FIG. 1 for a preferred embodiment of the invention, and FIG. 3 is a view corresponding to FIG. 2 for a system incorporating a circuit. curly distribution. Currently, buildings account for around 40% of the energy needs (consumptions) of all sectors. The thermal regulation in force in France, called RT2012, provides for an average consumption cap of 50 kWhep / m2 / year (ie 50 kilowatt hours primary energy per square meter per year). The distribution of these needs for the given value of 50 kWhpe / m2 / year is as follows: 30 25 kWhe p / m2 / year for domestic hot water (DHW), ie 50% of the overall requirement, 15 kWhpe / m2 / year for heating, ie 30% of the overall requirement, 5 kWhep / m2 / year for lighting, or 10% of the overall requirement, 3031575 5 5 kWhep / m2 / year for auxiliaries, or 10% of the overall requirement. Thus, it is clear from these figures that the domestic hot water station becomes preponderant. The system described below makes it possible to limit substantially the energy consumption for the production of sanitary hot water. Comparative regulatory studies have highlighted the need for the integration of hot water production processes (heating and sanitary) with renewable energies, such as solar, heat pumps, etc. The present invention relates to a thermodynamic system for the direct production of domestic hot water. In the embodiment described below, it is intended to use a heat pump (PAC) high temperature (temperature55 ° C). The described system can be implemented in sectors such as tertiary, residential and small / medium industries, etc. A DHW tank can be considered as a reservoir of energy. One can define for him a yield, called balloon efficiency, which is the ratio between the "usable volume" of the balloon and the "volume stored in the balloon". In other words, we compare the "energy" stored in the balloon with the one it would store if it was fully filled with hot water. This yield depends essentially on the phenomena of the stratification of hot water in the flask during the phase of production (reconstitution) and that of the drawing (consumption).

Ideally, all of its water should be withdrawn from a hot water tank at its nominal temperature. It is sought to tend towards this ideal by increasing as much as possible the volume of water that can be drawn at a temperature above a predetermined temperature (below the nominal temperature) in the balloon.

The original idea underlying the system proposed below and to achieve a better performance of the balloon by optimizing the stratification of hot water in the balloon during the two phases of production and distribution (consumption).

303 15 75 6 The control of the stratification of water in the flask also allows the thermodynamic system to obtain a better energy efficiency during the production phase (reconstitution). The purpose of the system proposed below is to respond at any time to the need for DHW according to the type and nature of the establishment for which it is intended, and to adapt to the geographical situation (weather conditions) while obtaining better efficiency (performance, reduced size, savings in investment, etc.). Thus, it is proposed a temperature control on a secondary circuit 10 associated with an injection of domestic hot water produced by a multi-level heat pump (two levels minimum) in a single cylinder type ECS. FIG. 1 illustrates a thermodynamic system comprising four main elements: a tank 2 for producing and storing DHW, preferably equipped with auxiliary and / or emergency equipment (electrical type or tubular heater, etc.); ) distributed in the lower part or / and upper part of the flask, temperature probes and taps necessary for the proper functioning of the system, - a heat pump 4, for example high temperature and of the Air / Water or Water / Water type, ideally to directly produce ECS at 55 ° C under normal climatic conditions; a thermal transfer module (MTT) for ensuring hydraulic connections of the tank 2 and the heat pump 4 on the one hand, the heat transfer and the regulation intended for the production of DHW from the system to the notably using a heat exchanger 6 on the other hand, and an electrical cabinet advantageously equipped with an AIP type automaton for controlling and regulating the operation of the thermodynamic system. With various options selected, it must advantageously make it possible to establish the energy balance of the system. The balloon 2 is, with a few details, the same type as a hot water tank "classic". It has a single tank designed to hold water. The balloon 2 has a lower part and an upper part which are defined by the arrangement of the balloon along a vertical axis. A water inlet 8, for example from a drinking water distribution network, feeds the balloon in the lower part thereof. A tapping point 10 is preferably located at the highest point of the balloon 2. In a conventional manner, the balloon 2 is then fed with water to be heated by the water inlet 8 and once heated, the water is The balloon 2 preferably has a drain 12 at its lowest point. In this manner, the up / down orientation is given with respect to the gravity. Indeed, for those skilled in the art, it is conventional to take such an orientation because in a DHW flask, because of the gravity, the cold water will be rather in the lower part of the balloon and the hot water in the upper part. As mentioned above, the balloon 2 is equipped here with two auxiliary equipment 14, conventionally composed essentially of an electrical resistance and a regulating device, arranged at different heights. These auxiliary equipment 14 are for example disposed substantially at 1/3 and 2/3 of the height of the balloon 2. The balloon 2 also has a first high input 16, a second high input 18 and a low output 22. The first high input 16 20 is disposed above the second high input 18, or at least at a higher height on the balloon than the first high input 16. The low output 22 is formed in the lower part of the balloon 2. It can, as illustrated in Figure 1, be substantially at the same height as the water inlet 8, for example in diametrically opposite position to this water inlet 8.

Finally, we note on the balloon 2 the presence of two temperature probes, called T1 and T2. As illustrated, the probe T1 is substantially at the height of the low output 22 while the probe T2 is preferably substantially at the height of the second high input 18. The heat transfer module comprises as main element 30 the exchanger thermal 6 which is here as a countercurrent exchanger between two hydraulic circuits: a first circuit or primary circuit 24 which supplies the calories produced by the heat pump 4 and a second circuit called secondary circuit 26 which provides the calories received in the thermal transfer module 3031575 8 to the water contained in the flask 2. The heat exchanger 6 is for example in the form of a plate heat exchanger. On the side of the tank 2, the module has a cold inlet 28 connected via the exchanger to a hot outlet 30. On the heat pump 4 side, the heat transfer module has a hot inlet 32 connected to a cold outlet 34 At the primary circuit 24, the hot inlet 32 of the heat transfer module is connected to the outlet of the heat pump 4 supplying a coolant, for example, water or brine, to a relatively high temperature. high temperature (preferably greater than 55 ° C) and the cold outlet 34 is connected to an inlet of the heat pump 4. Those skilled in the art knowing the operation of a heat pump, the heat pump 4 n ' is not described in detail here. It is only specified that it is a heat pump for supplying a fluid at high temperature and which is preferably of the air / water type. However, other types of heat pumps, for example water / water, could also be suitable. The primary circuit 24 comprises elements that are usually found on a hydraulic circuit and which are not described here (valve, purger, expansion tank, filling valve, drain valve, ...). A pump P2 ensures the circulation of the fluid in the primary circuit 24. The secondary circuit 26 has a first part called upper part and a second part called lower part.

The upper part of the secondary circuit 26 connects the hot outlet 30 (of the heat transfer module) to the first upper inlet 16 and the second upper inlet 18 of the tank 2. This upper part has a bypass 36 downstream of which there is a first branch 38 connected to the first high input 16 and a second branch 40 connected to the second high input 18. The first branch 38 comprises a solenoid valve EVa while the second branch 40 comprises a solenoid valve EV1. The lower part of the secondary circuit 26 has on the side of the balloon 2 first of all an expansion tank 44 downstream of which there is an anti-return valve 46, then a flow regulator 48 and a pump P1. Between the lower part and the upper part of the secondary circuit 26 is a short circuit 50 comprising a solenoid valve EV2. When the latter is open, liquid, water, can pass directly to the cold inlet 28 without being passed through the balloon 2. This short circuit 50 is for example connected to the upper part of the secondary circuit at the of the branch 36 and joins the lower part of the secondary circuit 26 downstream of the check valve 46. To ensure the regulation of the system, it is expected to have several temperature sensors. There is thus: a temperature sensor Tef for measuring the temperature of the water at the water inlet 8; a temperature sensor T3 for measuring the temperature of the hot water at the cold inlet; a temperature sensor T4 for measuring the temperature of the DHW 15 at the hot outlet 30, and - temperature sensors T5, T6, T7 and T8 for controlling the temperature within the heat pump 4. All Temperature sensors, all control valves, as well as other components are connected to a control and management device which is preferably located in an electrical cabinet (not shown in the drawing). This control device is for example in the form of a PLC type PLC (acronym for Programmable Industrial Automation). The embodiment of FIG. 2 differs mainly from the embodiment of FIG. 1 in that the upper part of the secondary circuit has three branches. For the description of this FIG. 2 and of FIG. 3, the references already used in the description of FIG. 1 are used to designate similar elements. Thus, in FIG. 2, in addition to the elements illustrated in FIG. 1, there is a third branch 42 in the upper part of the secondary circuit 26. This "extra" branch supplies a third high input 20 made in the balloon 2. below the second high input 18 but still in the upper part of the balloon 2 (for example in the upper half of the balloon 2). This third branch 42 has a solenoid valve EVb for regulating the water circulating in the third branch 42. At the third upper inlet 20, there is also associated a temperature sensor T2a intended to measure the temperature of the ECS located in the balloon 2 at the height of this third high input 20. In the embodiment of FIG. 2, there are also two water meters for measuring the flow of water: a water meter D1 measures the quantity of water. water entering the flask 2 by the water inlet 8 and a water meter D2 measures the amount of water exiting through the hot outlet 30. FIG. 3 gives an example of a distribution circuit supplied by the heating system. Figure 2 (which is shown in this figure 3). The distribution circuit has distribution points symbolized by valves 52. A heating loop 54 is provided. This loop 54 comprises heating means, for example an electrical resistor 56 arranged in the loop. This loop is naturally supplied with hot water from the point of drawing of the balloon 2. To heat the water in the loop 54 from the heat production of the heat pump 4, it is also planned to connect the loop 54 to the system of Figure 2 directly from the hot outlet 30, or between the latter and the bypass 36. The connection between the hot outlet 30 and the loop 54 is provided with a solenoid valve EVrc2. It injects hot water preferably just upstream of the electrical resistance 56. A return of the loop 54 to the secondary circuit 26 is also provided. This return is made just upstream in the loop 54 of the hot water inlet of the secondary circuit 26. To prevent hot water from returning directly to the secondary circuit 26, a non-return valve 46 'is provided between the two links of the loop 54 with the secondary circuit 26. The return link of the loop 54 to the secondary circuit 26 also has a solenoid valve 30 EVrc1 and possibly a flow regulator 58. The systems described above allow temperature control of the secondary circuit 26 to achieve better performance of the thermodynamic system than comparable systems of the prior art. By referring, for example, to the system illustrated in FIG. 2, it is possible to carry out the following operations: "Instantaneous" production mode 5 When a predefined threshold measured by the water meter D1 (which may be for example equipped with a pulse transmitter to communicate with the management PLC) is exceeded (which corresponds to high volumes of draw), the regulation is done according to the following principle: when the temperature of the hot water measured by the temperature sensor T4 is equal to or slightly greater than a production set point temperature, the solenoid valves EVb, EV1 and EV2 will be closed and EVa open. Thus hot water is sent via the first branch 38 (the highest branch) into the balloon 2. Otherwise the hot water returns via the short circuit 50 (that is to say with the solenoid valves EVa, EVb and EV1 closed, and the solenoid valve EV2 open) in the heat exchanger 6 of the heat transfer module to be reheated until its temperature is equal to or slightly greater than the production temperature setpoint and This regulation then ensures an "instantaneous" production mode, making it possible to directly produce water at the production temperature (distribution) at the time of large drawdowns (consumption) and thus to add a certain additional volume (the volume produced depends on the power of the heat pump 4 and the climatic conditions) to the buffer volume of the storage in the tank 2.

Compared with existing systems, the system proposed here makes it possible to reduce the storage buffer volume of the balloon used. Production mode "semi-instantaneous" or "semi-accumulation" When the preset threshold according to the water meter D1 is not exceeded (low draw-off volumes), the regulation is done according to the following principle: the temperature the hot water measured by the temperature sensor T4 is systematically compared with the water temperatures in the flask measured by the temperature sensors T2 and T2a and with the production instruction 3031575 12. Depending on the value measured by the temperature sensor T4, the hot water orientations are thus regulated: If the value measured by the temperature sensor T4 is equal to or slightly greater than the production setpoint, hot water is 5 directly sent to the upper part of the balloon via the first branch 38 (solenoid valves EV1, EV2 and EVb will be closed and EVa open). If the value measured by the temperature sensor T4 is equal to or slightly greater than that measured by the temperature sensor T2 in the balloon 2, the solenoid valves EV2, EVa and EVb will be closed and EV1 open. Hot water is sent through the solenoid valve EV1 into the tank 2 via the second branch 40. If the value measured by the temperature sensor T4 is lower than that measured by the temperature sensor T2, but equal to or greater to that measured by the temperature sensor T2a in the balloon 2, the solenoid valves EV1, EV2 and EVa will be closed and EVb open. Hot water is thus sent through the solenoid valve EVb into the balloon (third branch 42). If the value measured by the temperature sensor T4 is less than that measured by the temperature sensor T2a in the tank 2, the solenoid valves EV1, EVa and EVb will be closed and EV2 open. Hot water is returned via the short-circuit 50 to the heat exchanger 6 of the heat transfer module to be reheated until its temperature reaches at least the value of T2a in order to be introduced into the 25 balloon 2 via the third branch 42 or the second branch 40. Compared to existing systems, this mode of regulation, corresponding to the mode of production "semi-instantaneous" or "semiaccumulation", allows to control perfectly the phenomena of stratification of water in the flask, on the one hand, and reduce the storage buffer volume 30 under identical conditions, on the other hand. The more important the installation (in terms of volume and power), the more efficient this mode of regulation is in terms of gains (savings in investment and energy consumption).

3031575 13 This control mode is also applicable for the management of heating networks with different temperature regimes, but with centralized production.

5 Production mode called "accumulation" Here, the profile of the consumption of DHW and the ratio of the "volume of the tank / power of heat pump" are adapted. The devices described above can easily be adapted to this production mode "accumulation" whose purpose is to control and record the amount of DHW consumed during the period of consumption (for example during the day) and to reconstitute in the balloon it under favorable conditions (for example in the night). Adaptations are realized for example as follows: Case 1 simple -> Regular daily consumption: The regulation is simple for this case. With a sufficient amount of DHW and previously stored in the flask, the drawing into the flask 2 (consumption) is done during the consumption period (for example during the day) and the contents of flask 2 are reconstituted only during the period without consumption (for example at night). The configuration of the thermodynamic system illustrated in FIG. 1 with two levels of injection of hot water into the tank 2 and two temperature probes T1 and T2 but without a water meter D2 is sufficient and well adapted. The management of the DHW production is carried out as follows: the temperature measured by the temperature sensor T4 is compared with the values of the production setpoint and the measurement made by the temperature sensor T2: If the value measured by the sensor temperature T4 is equal to or slightly greater than the production setpoint, hot water is directly sent to the upper part of the flask via the first branch 38 (solenoid valves EV1 and EV2 will be closed and EVa open); If the value measured by the temperature sensor T4 is lower than the production setpoint, but equal to or slightly greater than the value measured by the temperature sensor T2, hot water is sent into the balloon via the second branch. 40 (solenoid valves EV2 and EVa will be closed and EV1 open); If the value measured by the temperature sensor T4 is lower than the value measured by the temperature sensor T2, lukewarm water is sent via the short-circuit 50 (the solenoid valves EV1 and EVa will be closed and EV2 open). to the heat exchanger 6 of the heat transfer module to be reheated until its temperature reaches the value measured by the temperature sensor T2.

10 Case 2 -> Daily consumptions relatively variable in the week (month): Obviously, the system (volume of the tank 2 and power of the heat pump 4) must be sized to meet the maximum daily consumption.

The necessary quantities, corresponding, for example, to the daily consumptions of the week (or month) of an ERP (acronym for "establishment receiving the public"), and the desired reconstitution period are previously recorded in the regulator (PLC AIP) ; With the aid of the water meter D1 on the water supply 8, the consumption of DHW during the drawing is recorded, calculated in total and controlled in the regulator; The cumulative value at the end of the consumption period is compared to the value of the daily consumption of the day before recorded. The results of this comparison determine the volume of hot water to be reconstituted for the following day: If the cumulative value is lower than that of the following day (possibly increased by a factor of safety or for an exceptional event, an important possibility for the LES), it is the consumption (need) of the next day's ECS which will be the volume to be reconstituted during the period without consumption. In any case, the production at the level of the heat pump 4 stops when the temperature measured at the temperature sensor T1 reaches the set point, corresponding to the maximum level of the useful volume of the balloon.

3031575 15 Otherwise, that is to say, if the accumulated value is greater than that of the following day (increased possibly by a factor of safety or for an exceptional event), it is still the consumption (need) in ECS the next day which will be the volume to be reconstituted during the period without consumption. This solution makes it possible to guarantee the necessary volume in ECS for the needs of the next day, to evaluate the behaviors of the users in ECS if necessary and at the same time to limit as much as possible the unnecessary static losses of the storage. With the help of the water meter D2, the regulation is relatively simple: The management of the production of DHW during the non-consumption period follows the same principle described above with reference to FIG. that all the (small) volume of water having a temperature equal to or slightly higher than the production set point temperature (temperature set point at the temperature sensor T4) is recorded and counted. Once the cumulated volume is equal to or slightly greater than the volume of the next day to be produced, the controller stops the operation of the heat pump 4.

With the presence of the water meters D1 or / and D2, associated with temperature probes Tef and T4 (or temperature probe Tec placed at the point of drawing 10, depending on the configuration of the installation), it is easy to establish the energy balance of the system intended for the production of DHW.

For the embodiment of FIG. 3, more particularly concerning collective installations for the production and distribution of DHW, in which the DHW distribution circuit is generally completed with a maintenance of the temperature at a value generally greater than 50 ° C (according to the regulations in force) in order to guarantee the availability at any time of hot water and also the sanitary quality (prevention against Legionellae). This maintenance of water temperature consumes a considerable amount of energy. Most collective DHW installations operate in 3031575 16 "semi-instantaneous" or "semi-accumulation" mode. According to the profiles of the consumption of DHW in the tertiary and collective housing sectors, there are generally at least two relatively long periods without consumption and in which the heat pump is off.

With a system as described above, the heat pump 4 will be used to help maintain the loopback temperature in order to reduce the electric power consumption by virtue of the heat pump's coefficient of performance 4 which is the more often than 1.

The principle of the participation of the heat pump 4 in maintaining the temperature of the water in the loop 54 is illustrated in FIG. 3. The management of the maintenance of the temperature of the loopback by the heat pump 4 is carried out for example as follows: The production of DHW by the thermodynamic system is always a priority. The use of the heat pump 4 is done provided that the production instruction in the tank 2 is reached or the volume to be reconstituted in the tank 2 is achieved. Before starting the operation of maintaining the temperature of the water in the loop 54, the solenoid valves (EV1, EV2, EVa and EVb) are in the closed position. Depending on the flow rate (speed) of the loopback and the power of the heat pump 4, the flow rate is adjusted using the solenoid valve EVrc1 adjustment, intended to send water from the loop to the heat pump 4. The flow rate setting is set so that the temperature of the water heated by the heat pump 4 is close to the intended dispensing temperature. The holding operation is carried out for example as follows: After the opening of the two solenoid valves EVrc1 and EVcr2, the controller restarts the heat pump 4 and the circulator P1 in order to send water from the loop 54 to the exchanger thermal 6 of the heat transfer module 30 to be reheated. Since the actual power of the heat pump 4 varies according to the climatic conditions, it is desirable that heated water be returned to the loop heater before introducing it directly into the distribution circuit.

3031575 17 This operation will stop as soon as there is a DHW draw (need), detectable by the presence of the water meter Dl or another instrument on the DHW start circuit. The production of DHW is restarted according to the principles defined above after the closing of the two solenoid valves EVrc1 and EVcr2.

As can be seen from the foregoing description, the invention provides a system which by means of two-way solenoid valves (or three-way or four-way solenoid valves) and with the regulation of the DHW temperature produced by the heat pump, the temperature of the DHW introduced into the flask will have at least a temperature equal to that of the water at the place (level) where is introduced the ECS produced by the heat pump. As a result, the stratification of hot water in the flask is maintained. According to the profile of the DHW consumption and the configuration of the installation (volume of the flask and the power of the heat pump), the system 15 can adapt, thanks to the regulation, to three modes of the production of domestic hot water, as required, either: Semi-instantaneous accumulation or semi-accumulation Instantaneous As is known to those skilled in the art, the coefficient of performance (COP) of a heat pump is often very much greater than 1 except in certain special cases (for example during a defrosting phase). With the systems described above, the use of the heat pump can be optimized to also reduce power consumption for a looped distribution circuit. For example, for a COP of 3, one can produce 3 kWh in heat for 1 kWh consumed, a saving of 2 kWh of electrical energy consumed compared to a solution in electric heater alone. Of course, the present invention is not limited to the preferred embodiments described above and the variants mentioned but it relates to all the variants within the scope of the claims below.

Claims (7)

  1. REVENDICATIONS1. Thermal transfer module between a first circuit called primary circuit (24) and a second circuit called secondary circuit (26), and balloon (2) associated with a lower part and an upper part disposed above said lower part, said thermal transfer module comprising: - an input called hot input (32) intended to be connected to the primary circuit (24), - a so-called cold output output (34) connected within the module to the hot input (32) and intended to ensure a return to the primary circuit (24), - an input called cold input (28) connected to the lower part of the balloon (2), and - a so-called hot output output (30) connected within the module to the cold inlet (28) and connected to the upper part of the tank (2), characterized in that a bypass (36) is produced downstream of the hot outlet (30), between the heat transfer module and the balloon (2), so as to obtain at least two branches (38, 40), each branch (38, 40) feeds the balloon (2) at feed points (16, 18) arranged at different heights, in that regulating means are provided for regulating a flow of water in each branch (38, 40), that temperature sensors are arranged, on the one hand, in the flask (2) to determine therein at at least two distinct heights a water temperature in the flask and, on the other hand, upstream of the bypass, and in that management and control means are connected to the temperature sensors and the flow control means.
  2. 2. Heat transfer module and associated balloon according to claim 1, characterized in that each leg (38, 40) is provided with a solenoid valve.
  3. 3. Thermal transfer module and associated balloon according to one of claims 1 or 2, characterized in that the balloon (2) comprises a temperature sensor at the bottom and a temperature sensor associated with each point 3031575 (16, 18) by the branches (38, 40), except for the upper feed point.
  4. 4. Thermal transfer module and associated balloon according to one of claims 1 to 3, characterized in that it comprises a short circuit (50) for passing water out of the hot outlet (30) to the cold inlet (28) without passing through the tank (2) and having regulating means for controlling the flow of water in said short circuit (50).
  5. 5. Thermal transfer module and associated balloon according to one of claims 1 to 4, characterized in that it further comprises a looped distribution circuit (54), and in that this looped distribution circuit (54) is fed, on the one hand, from the hot outlet (30), upstream of the bypass (36) and, on the other hand, from an outlet (10) disposed in a high position on the balloon (2). ).
  6. 6. Hot water production system, characterized in that it comprises a heat transfer module and a balloon (2) associated according to one of claims 1 to 5.
  7. Hot water production system according to claim 6, characterized in that it comprises a heat pump (4) connected, on the one hand, to the hot inlet (32) and, on the other hand, at the cold outlet (34) of the heat transfer module.
FR1550212A 2015-01-12 2015-01-12 Thermal transfer module with associated regulation for thermodynamic system for hot water production Active FR3031575B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10323859B2 (en) * 2016-10-27 2019-06-18 King Fahd University Of Petroleum And Minerals Water mixing system for thermoregulating water
EP3581853A1 (en) 2018-06-13 2019-12-18 Lacaze Energies Heat transfer module for hot water production

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1298395A2 (en) * 2001-09-28 2003-04-02 Daikin Industries, Ltd. Heat pump type hot water supply system
EP2090836A2 (en) * 2008-02-15 2009-08-19 Robert Bosch GmbH Stratified storage system and method for operating same
JP2011141076A (en) * 2010-01-07 2011-07-21 Corona Corp Heat pump type hot water supply device
WO2014044864A1 (en) * 2012-09-24 2014-03-27 Electricite De France Domestic water heating facility having a heating function
WO2014087700A1 (en) * 2012-12-04 2014-06-12 シャープ株式会社 Heat pump heat supply system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1298395A2 (en) * 2001-09-28 2003-04-02 Daikin Industries, Ltd. Heat pump type hot water supply system
EP2090836A2 (en) * 2008-02-15 2009-08-19 Robert Bosch GmbH Stratified storage system and method for operating same
JP2011141076A (en) * 2010-01-07 2011-07-21 Corona Corp Heat pump type hot water supply device
WO2014044864A1 (en) * 2012-09-24 2014-03-27 Electricite De France Domestic water heating facility having a heating function
WO2014087700A1 (en) * 2012-12-04 2014-06-12 シャープ株式会社 Heat pump heat supply system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10323859B2 (en) * 2016-10-27 2019-06-18 King Fahd University Of Petroleum And Minerals Water mixing system for thermoregulating water
EP3581853A1 (en) 2018-06-13 2019-12-18 Lacaze Energies Heat transfer module for hot water production

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