FR3106198A1 - Partitioned heat exchanger, thermal energy recovery unit and associated sterilization device - Google Patents

Abstract

Partitioned heat exchanger, thermal energy recovery unit and associated sterilization device The invention relates to a heat exchanger (1) comprising: - a main circulation zone (2) capable of receiving a main fluid (5), and circulation means capable of receiving a secondary fluid and configured to provide heat exchange with the main circulation zone (2), characterized in that: • the main circulation zone (2) comprises a first part (7) and a second separate part (9), and • the circulation means comprise • a first fluid circuit (6) arranged in contact with the first part (7) of the heat exchanger (1) and intended to receive the secondary fluid so to ensure a heat exchange between the secondary fluid and the main fluid (5) circulating in the first part (7), • a second fluid circuit (8) arranged in contact with the second part (9) of the heat exchanger ( 1) and tined to receive the secondary fluid, so as to ensure a heat exchange between the secondary fluid and the main fluid (5) circulating in the second part (9), • the first fluidic circuit (6) and the second fluidic circuit (8) being configured to be alternately fluidly independent or to be fluidly connected to each other. The present invention relates to the field of energy recovery and optimization of the use of thermal energy. It finds a particularly advantageous application in the field of sterilizers using heat discontinuously for the implementation of a sterilization cycle. Figure for the abstract: Fig. 1

Description

Partitioned heat exchanger, thermal energy recovery unit and associated sterilization device

The present invention relates to the field of energy recovery and optimization of the use of thermal energy. It finds a particularly advantageous application in the field of sterilizers using heat in a discontinuous manner for the implementation of a sterilization cycle.

STATE OF THE ART

The ecological optimization of industrial devices and processes is an approach in which manufacturers are increasingly committed. Ecological optimization, in addition to having a positive effect on the environment, contributes to the image of the company. Ecological optimization commonly involves energy optimization allowing a reduction in costs.

Among the industrial processes that can be optimized, sterilization devices and processes are major consumers of energy and water, a major part of which is not recycled.

We know the document US 9,566,356 B2 describing an energy recovery sterilization device.

The device of this document comprises a sterilization chamber in which the products to be sterilized are deposited. The sterilization chamber is connected to a primary fluid circuit. The products to be sterilized in the sterilization chamber are sprayed with hot water from the primary fluid circuit. In said primary fluid circuit, the fluid is heated or cooled by means of a heat exchanger. This first heat exchanger comprising for this purpose a steam inlet, a supply line for a coolant, a return line for the coolant and a condensate drain. A second heat exchanger is arranged in series on the primary fluid circuit and is connected to a secondary fluid circuit. The second exchanger makes it possible to heat or cool the primary fluid circuit thanks to a secondary fluid circuit. The device also includes a laminated storage reservoir. During a cooling cycle of the primary fluid circuit, the energy of the primary fluid circuit is therefore transmitted via the second heat exchanger to the secondary fluid circuit and can be stored in the stratified storage tank. When cooling by heat transfer to the secondary fluid circuit is no longer possible then the primary fluid circuit is cooled via the supply line of a coolant in the first heat exchanger until the target temperature is reached. During a next heating of the chamber, the hot fluid is released in a temperature stratified manner from the stratified storage tank to the primary fluid circuit via the second heat exchanger as long as the heat transfer to the primary fluid circuit is possible, then the primary fluid circuit is heated via the steam line in the first heat exchanger until the target temperature is reached.

This device presents a loss of efficiency due to the use of each exchanger for one stage of the cycle. The device does not allow optimized recovery of the stored thermal energy.

There is therefore a need to improve the recovery of the thermal energy recovered and used.

The other objects, features and advantages of the present invention will become apparent from a review of the following description and the accompanying drawings. It is understood that other benefits may be incorporated.

SUMMARY

To achieve this objective, according to one embodiment, a heat exchanger is provided comprising
- a main circulation zone capable of receiving a main fluid, and
- circulation means capable of receiving a secondary fluid and configured to ensure heat exchange with the main circulation zone, characterized in that the main circulation zone comprises a first part and a second part, advantageously separate, and that the means circulation include
- a first fluidic circuit arranged in contact with the first part of the heat exchanger and more precisely with the main circulation zone and intended to receive the secondary fluid so as to ensure a heat exchange between the secondary fluid and the main fluid circulating first part, and
- a second fluidic circuit arranged in contact with a second part of the main circulation zone and intended to receive the secondary fluid, so as to ensure heat exchange between the secondary fluid and the main fluid flowing in the second part, and
that the first fluidic circuit and the second fluidic circuit being configured to be alternatively fluidically independent or to be fluidically connected to each other.

The heat exchanger of the invention makes it possible to reduce or increase the exchange surface of the heat exchanger according to the storage or thermal energy needs. The dimensioning of the exchanger is thus facilitated and advantageously reduced. The modularity of the heat exchanger makes it possible to size the heat exchanger according to the most restrictive functionality. The two-part structure of the exchanger and the presence of circulation means which can advantageously be controlled according to requirements makes it possible to use a single optimized exchanger.

Optionally, the exchanger is able to be fluidically connected to a thermal energy storage module, more precisely the first fluidic circuit and the second fluidic circuit are able to be fluidically connected to the energy storage module so that the the thermal energy exchanged by the exchanger can be stored towards or withdrawn from the storage module.

The invention relates, according to another aspect, to an upgrading unit comprising a heat exchanger as described above and a thermal energy storage module fluidically connected to the first fluidic circuit and to the second fluidic circuit so as to be capable of storing and destock the secondary fluid.

The invention relates according to another aspect to a sterilization device comprising a sterilizer and a recovery unit as described above, the main fluid being used as the sterilization fluid in the sterilization device. The recovery unit thus makes it possible to store the thermal energy of the main fluid by the secondary fluid in the storage module at the end of the sterilization cycle and to destock the thermal energy stored in the storage module to heat or at least preheat the main fluid intended for use in the sterilization device.

The invention relates to the use of a recovery unit as described above in a sterilizer.

• quand la température du fluide de stockage en sortie du module de stockage T_R,1est supérieure à la température T_{STW, from}du fluide principal en entrée de la zone de circulation principale, le premier circuit fluidique et le deuxième circuit fluidique sont connectés fluidiquement, le fluide de stockage circule successivement dans le premier circuit fluidique puis le deuxième circuit fluidique de sorte à assurer un échange thermique du fluide de stockage vers le fluide principal dans la première partie et dans la deuxième partie, ou
• quand la température du fluide de stockage en sortie du module de stockage T_R,1est supérieure à la température T_{STW, from}du fluide principal en entrée de la zone de circulation principale, et que la température T_{STW, to} du fluide principal en sortie de la zone de circulation principale est inférieure à une température de consigne ), le premier circuit fluidique et le deuxième circuit fluidique sont indépendants fluidiquement, le premier circuit fluidique assure le préchauffage du fluide principal par le fluide de stockage déstocké du module de stockage et circulant dans le premier circuit fluidique et le deuxième circuit fluidique assure le chauffage du fluide principal par une source chaude circulant dans le deuxième circuit fluidique, ou
• quand la température du fluide de stockage en sortie du module de stockage T_{R ,1}est inférieure à la température T_{STW, from}du fluide principal en entrée de la zone de circulation principale, le premier circuit fluidique et le deuxième circuit fluidique sont indépendants fluidiquement, le premier circuit fluidique assure le préchauffage du fluide principal par une source chaude et le deuxième circuit fluidique assure le chauffage du fluide principal par une source chaude. Selon une possibilité, les retours des sources chaudes respectivement du premier circuit fluidique et du deuxième circuit fluidique sont connectées fluidiquement pour assurer un retour commun des condensats de la source chaude vers par exemple la chaudière.

Another aspect relates to a process for recovering thermal energy by a recovery unit as described above in which during a step of heating the main fluid so that the temperature T_{STW, to ,}of the main fluid leaving the main circulation zone reaches a set temperature:

• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is greater than the temperature T _{STW, from} of the main fluid at the inlet of the main circulation zone, the first fluidic circuit and the second fluidic circuit are fluidically connected , the storage fluid circulates successively in the first fluidic circuit then the second fluidic circuit so as to ensure heat exchange from the storage fluid to the main fluid in the first part and in the second part, or
• when the temperature of the storage fluid at the outlet of the storage module T_R,1is greater than the temperature T_{STW, from}of the main fluid entering the main circulation zone, and that the temperature T_{STW, to} of the main fluid at the outlet of the main circulation zone is below a setpoint temperature), the first fluidic circuit and the second fluidic circuit are fluidically independent, the first fluidic circuit ensures the preheating of the main fluid by the storage fluid removed from the storage module and circulating in the first fluidic circuit and the second fluidic circuit ensures the heating of the main fluid by a hot source circulating in the second fluidic circuit, or
• when the temperature of the storage fluid at the outlet of the storage module T _{R ,1} is lower than the temperature T _{STW, from} of the main fluid at the inlet of the main circulation zone, the first fluid circuit and the second fluid circuit are fluidically independent , the first fluidic circuit ensures the preheating of the main fluid by a hot source and the second fluidic circuit ensures the heating of the main fluid by a hot source. According to one possibility, the returns of the hot sources respectively of the first fluidic circuit and of the second fluidic circuit are fluidically connected to ensure a common return of the condensates from the hot source to, for example, the boiler.

• quand la température du fluide de stockage en sortie du module de stockage T_R,1est inférieure à la température T_{STW, from}du fluide principal en entrée de la zone de circulation principale, le premier circuit fluidique et le deuxième circuit fluidique sont connectés fluidiquement, le fluide de stockage circule successivement dans le premier circuit fluidique puis le deuxième circuit fluidique de sorte à refroidir le fluide principal et stocker l'énergie thermique dans le module de stockage,
• quand la température du fluide de stockage en sortie du module de stockage T_R,1est inférieure à la température T_{STW, from}du fluide principal en entrée de la zone de circulation principale, le premier circuit fluidique et le deuxième circuit fluidique sont indépendants fluidiquement, le premier circuit fluidique assure le prérefroidissement du fluide principal par le fluide de stockage déstocké du module de stockage et le deuxième circuit fluidique assure le refroidissement du fluide principal par une source froide,
• quand la température du fluide de stockage en sortie du module de stockage T_R,1est supérieure à la température T_{STW, from}du fluide principal en entrée de la zone de circulation principale, le premier circuit fluidique et le deuxième circuit fluidique sont connectés fluidiquement, la source froide circulant successivement dans le deuxième circuit fluidique puis dans le premier circuit fluidique.

Another aspect relates to a process for recovering thermal energy by a recovery unit as described above in which during a step of cooling the main fluid so that the temperature T _{STW, to} , of the main fluid at the outlet of main circulation zone reaches a set temperature:

• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is lower than the temperature T _{STW, from} of the main fluid at the inlet of the main circulation zone, the first fluidic circuit and the second fluidic circuit are fluidically connected , the storage fluid circulates successively in the first fluidic circuit then the second fluidic circuit so as to cool the main fluid and store the thermal energy in the storage module,
• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is lower than the temperature T _{STW, from} of the main fluid at the inlet of the main circulation zone, the first fluid circuit and the second fluid circuit are fluidically independent , the first fluidic circuit ensures the precooling of the main fluid by the storage fluid removed from the storage module and the second fluidic circuit ensures the cooling of the main fluid by a cold source,
• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is greater than the temperature T _{STW, from} of the main fluid at the inlet of the main circulation zone, the first fluidic circuit and the second fluidic circuit are fluidically connected , the cold source circulating successively in the second fluidic circuit then in the first fluidic circuit.

The invention makes it possible to envisage a single partitioned heat exchanger which is suitable for different hot and cold sources such as condensing steam, two-phase source or cooling water, single-phase source or hot or cold water. a thermal storage module, single-phase source.

BRIEF DESCRIPTION OF FIGURES

The aims, objects, as well as the characteristics and advantages of the invention will emerge better from the detailed description of an embodiment of the latter which is illustrated by the following accompanying drawings in which:

FIG. 1 represents the recovery unit according to the invention in heating mode of the main fluid by discharging the thermal energy storage module

FIG. 2 represents the recovery unit according to the invention in heating mode of the main fluid by discharging the thermal energy storage module and supplementing a hot source

FIG. 3 represents the recovery unit according to the invention in heating mode of the main fluid by the hot source

FIG. 4 represents the upgrading unit according to the invention in cooling mode of the main fluid by charging the thermal energy storage module

FIG. 5 represents the recovery unit according to the invention in cooling mode of the main fluid by charging the thermal energy storage module and backing up a cold source

FIG. 6 represents the recovery unit according to the invention in cooling mode of the main fluid by the cold source

FIG. 7 represents the recovery unit according to the invention in cooling mode of the main fluid according to FIG. 4 in which the main fluid circulates in counter-current. In this cooling mode, the main fluid is cooled by the thermal energy storage module, in a configuration where the latter is directly cooled by a cold source. In short, the cold source does not directly cool the main fluid, but cools part of the storage module, which in turn cools the main fluid.

The drawings are given by way of example and do not limit the invention. They constitute schematic representations of principle intended to facilitate understanding of the invention and are not necessarily scaled to practical applications.

DETAILED DESCRIPTION

Before starting a detailed review of embodiments of the invention, optional characteristics are set out below which may optionally be used in combination or alternatively.

Advantageously, the heat exchanger is a plate exchanger, preferably with welded plates.

Advantageously, the first fluidic circuit 6 and the second fluidic circuit 8 are able to be connected to a hot source and to a cold source, so as to provide heating of the main fluid alternately by the thermal energy stored in the storage module or by a heat source or by combining the thermal energy stored in the storage module and by the heat source and so as to provide cooling of the main fluid alternately by the thermal energy stored in the storage module or by a cold source or by combining the thermal energy stored in the storage module and by the cold source.

• à un départ du module de stockage de sorte à permettre l'entrée du fluide secondaire étant un fluide de stockage dans le premier circuit fluidique,
• à une arrivée de source chaude de sorte à permettre l'entrée du fluide secondaire étant une source chaude dans le premier circuit fluidique,
• à un retour de source froide de sorte à permettre la sortie du fluide secondaire étant une source froide hors du premier circuit fluidique.

Advantageously, the first fluidic circuit is configured to be fluidically connected, preferably by the first pipe 10:

• at an outlet from the storage module so as to allow entry of the secondary fluid being a storage fluid into the first fluid circuit,
• to a hot source inlet so as to allow entry of the secondary fluid being a hot source into the first fluid circuit,
• to a cold source return so as to allow the output of the secondary fluid being a cold source out of the first fluidic circuit.

• A un retour au module de stockage d'énergie thermique de sorte à permettre la sortie du fluide secondaire étant le fluide de stockage hors du premier circuit fluidique et permettre le stockage d'énergie thermique dans le module de stockage d'énergie thermique
• à la deuxième conduite 13 du deuxième circuit fluidique de sorte à mettre en connexion fluidique le premier circuit fluidique et le deuxième circuit fluidique,
• à un retour de la source chaude de sorte à permettre la sortie du fluide secondaire étant la source chaude hors du premier circuit fluidique.

Advantageously, the first fluidic circuit is configured to be fluidically connected, preferably by a second pipe 11:

• Has a return to the thermal energy storage module so as to allow the exit of the secondary fluid being the storage fluid from the first fluidic circuit and to allow the storage of thermal energy in the thermal energy storage module
• to the second pipe 13 of the second fluidic circuit so as to bring the first fluidic circuit and the second fluidic circuit into fluidic connection,
• to a return of the hot source so as to allow the output of the secondary fluid being the hot source out of the first fluidic circuit.

• à une arrivée d'une source chaude de sorte à permettre l'entrée du fluide secondaire étant la source chaude dans le deuxième circuit fluidique
• à un retour vers le module de stockage d'énergie thermique de sorte à permettre la sortie du fluide secondaire étant le fluide de stockage hors du deuxième circuit fluidique et permettre le stockage d'énergie thermique dans le module de stockage d'énergie thermique
• à un départ d'une source froide de sorte à permettre l'entrée du fluide secondaire étant la source froide dans le deuxième circuit fluidique.

Advantageously, the second fluidic circuit is configured to be fluidically connected, preferably by a first pipe 12:

• at an inlet of a hot source so as to allow entry of the secondary fluid being the hot source into the second fluidic circuit
• to a return to the thermal energy storage module so as to allow the exit of the secondary fluid being the storage fluid from the second fluidic circuit and to allow the storage of thermal energy in the thermal energy storage module
• at a departure from a cold source so as to allow entry of the secondary fluid being the cold source into the second fluid circuit.

• à la deuxième conduite 9 du premier circuit fluidique de sorte à mettre en connexion fluidique le premier circuit fluidique et le deuxième circuit fluidique
• à un retour de la source chaude de sorte à permettre la sortie du fluide secondaire étant la source chaude hors du deuxième circuit fluidique
• à un retour de source froide de sorte à permettre la sortie du fluide secondaire étant la source froide hors du deuxième circuit fluidique.

Advantageously, the second fluidic circuit is configured to be fluidically connected, preferably by a second pipe 13:

• to the second conduit 9 of the first fluidic circuit so as to bring the first fluidic circuit and the second fluidic circuit into fluidic connection
• to a return of the hot source so as to allow the exit of the secondary fluid being the hot source from the second fluidic circuit
• to a cold source return so as to allow the output of the secondary fluid being the cold source out of the second fluidic circuit.

Advantageously, the hot source is steam from a boiler

Advantageously, the cold source is water from a cold network.

Advantageously, the upgrading unit comprises a module for controlling the circulation of the main fluid and of the secondary fluid, the latter being in particular the hot source, the cold source and/or the storage fluid. The traffic control module advantageously comprising a plurality of valves.

Advantageously, depending on the different modes of operation of this heat exchanger, the flow of fluids, main fluid and secondary fluid, observed between the input and output terminals is similar either to a flow in cross current, or to a flow in counter- current, or to co-current flow.

It is specified that in the context of the present invention, the term "arranged on", or its equivalents means "in fluidic connection".

In the present description, the expression " A fluidically connected to B " is synonymous with " A is in fluidic connection with B " does not necessarily mean that there is no organ between A and B. The expressions "arranged on" or "on" are synonymous with "fluidically connected to".

The upstream and downstream at a given point are taken in reference to the direction of circulation of the fluid in the circuit.

The heat exchanger 1 illustrated in FIGS. 1 to 7 is advantageously able to be used associated with a storage module, not shown, and advantageously with a sterilization device also called a sterilizer or an autoclave.

A sterilization device is a device intended to sterilize products in particular by spraying hot water or hot water vapor.

The operation of sterilization devices is cyclical with successive stages: heating, maintaining the temperature, then cooling in a continuous cycle.

Conventionally, during a sterilization process, the load inside the autoclave undergoes a thermal cycle provided by heating by a hot source such as a boiler and cooling by a cold source such as water from city. The heat evacuated into the tap water during the sterilization cycles represents a substantial energy deposit which can amount to around 300 kWh (contained in 7 m ³ of water) per sterilization cycle carried out with one of the best-selling models. . Knowing that on certain industrial sites, the sterilizers make up to 20 cycles per day, the discharges are greater than 2 TWh and 50,000 m ³ of water per year and per sterilizer.

The sterilization process is timed by batch, also called “batch”, which does not allow the use of a simple heat exchanger to preheat the water entering the boiler. The use of a storage means to recover and store the waste heat with a view to its recovery during a following cycle makes it possible to overcome the fact that the heating and cooling phases are out of phase and occur at different times.

The thermal energy storage module is chosen from sensible heat storage which can be combined with latent heat storage. The storage module can be stratified, ie temperature stratified. By way of example, the storage module comprises a reservoir partitioned into several variable volumes. Advantageously, each volume is at a homogeneous temperature different from the other volumes. Preferably, the variable volumes are physically separated by deformable membranes.

The heat exchanger according to the invention advantageously makes it possible to divide the heat exchanger into two parts, a first part 7 and a second part 9 distinct, more precisely a main circulation zone 2. By distinct is meant in particular that the heat exchanger comprises a single enclosure whose two parts do not overlap. The exchanger comprises an enclosure in which are arranged a first fluidic circuit and a second fluidic circuit, advantageously not superposed and not overlapping.

The heat exchanger, that is to say the first part 7 and the second part 9, is thus fluidically connected and therefore supplied by a hot source such as for example a steam network, by a cold source such as for example a cooling network and/or by a storage fluid stored in the storage module. The invention thus makes it possible to improve the recovery of the thermal energy by recovering more durably the heat restored by the heat storage which is used to heat in a first time the main fluid then in a second time to preheat the main fluid intended in the sterilizer.

The heat exchanger and the recovery unit according to the invention are intended to be used in a sterilization device. The main fluid of the exchanger being the sterilization fluid.

In FIGS. 1 to 7, the heat exchanger 1 is of the shell-tube type to facilitate the illustration. Preferably, the heat exchanger has welded plates. Advantageously, in the exchanger according to the invention, the local heat exchange between the circulating fluids advantageously takes place in cross-current, which can be in counter-current or co-current orientation.

The heat exchanger 1 comprises a main circulation zone 2, advantageously defined in an enclosure, intended to receive a main fluid 5. The main circulation zone 2 comprises an inlet 3 to allow the main fluid 5 to enter the heat exchanger. 1 and an outlet 4 to allow the exit of the main fluid 5 from the heat exchanger 1. The main fluid 5 circulates in the main circulation zone 2 between the inlet 3 and the outlet 4.

The main circulation zone 2 comprises a first part 7 and a second part 9. The first part 7 and the second part 9 are preferably arranged in series following the circulation of the main fluid 5. The main circulation zone 2 defines an external volume, corresponding in Figures 1 to 7 to an enclosure, and in the case of a plate heat exchanger around the outer assembly of the plates.

The heat exchanger 1 comprises circulation means comprising a first fluidic circuit 6 capable of receiving a secondary fluid. The first fluidic circuit 6 is arranged in the first part 7 of the exchanger 1. It is understood that the first fluidic circuit 6 is arranged in the first part 7 in that the first fluidic circuit 6 is arranged in the volume of the first part 7 and in particular in contact with the first part 7 of the main circulation zone 2. The first fluidic circuit 6 is intended to ensure the heat exchange between the main fluid 5 circulating in the first part 7 and the secondary fluid circulating in said first fluidic circuit 6. The first fluidic circuit 6 comprises a first pipe 10 intended for the inlet and/or the outlet of the secondary fluid and a second pipe 11 intended for the inlet and/or the outlet of the secondary fluid. The secondary fluid circulates in the first fluidic circuit 6 between the first pipe 10 intended for the secondary fluid inlet and the second pipe 11 intended for the secondary fluid outlet or vice versa between the second pipe 11 intended for the secondary fluid inlet and the first conduit 10 intended for secondary fluid outlet. Advantageously, the main fluid 5 and the secondary fluid circulate in the first part 7 according to a cross-current with co-current or counter-current.

The heat exchanger 1 comprises circulation means comprising a second fluidic circuit 8 capable of receiving a secondary fluid. The second fluidic circuit 8 is arranged in the second part 9 of the exchanger 1. It is understood that the second fluidic circuit 8 is arranged in the second part 9 in that the second fluidic circuit 8 is arranged in the volume of the second part 8 and in particular in contact with the second part 8 of the main circulation zone 2. The second fluidic circuit 8 is intended to ensure the heat exchange between the main fluid 5 circulating in the second part 9 and the secondary fluid circulating in said second fluidic circuit 8. The second fluidic circuit 8 comprises a first pipe 12 intended for the inlet and/or the outlet of the secondary fluid and a second pipe 13 intended for the inlet and/or the outlet of the secondary fluid. The secondary fluid circulates in the second fluidic circuit 8 between the first conduit 12 intended for the secondary fluid inlet and the second conduit 13 intended for the secondary fluid outlet or vice versa between the second conduit 13 intended for the secondary fluid inlet and the first conduit 12 intended for secondary fluid outlet. Advantageously, the main fluid 5 and the secondary fluid circulate in the second part 9 according to a cross-current with co-current or counter-current.

The secondary fluid is chosen from a hot source, a cold source and/or a storage fluid. According to the embodiments, the secondary fluid circulating in the first fluid circuit 6 is identical to the secondary fluid circulating in the second fluid circuit 8 or else the secondary fluid circulating in the first fluid circuit 6 is different from the secondary fluid circulating in the second circuit fluidics 8.

The hot source is a fluid intended to provide thermal energy in the heat exchanger 1. The hot source is advantageously hot water or hot water vapor, preferably from a heating means such as for example a gas, oil, electric or biomass boiler.

The cold source is a fluid intended to recover thermal energy in the heat exchanger 1. The cold source is advantageously city water from a cold network, cooled by a cooling tower, a refrigeration unit or by heat exchange with groundwater, a river.

The storage fluid is advantageously a heat transfer fluid chosen to operate at the temperature of the application, in this case for a sterilization device. By way of example, the storage fluid is water, thus facilitating the successive circulation of the storage fluid, of the hot source and of the cold source in the first fluidic circuit 6 and the second fluidic circuit 8. Advantageously, the Water remains the most advantageous storage fluid. The water is preferentially pressurized and potentially overheated. Other fluids can be envisaged such as thermal oil.

The first fluidic circuit 6 is advantageously fluidically connected to an outlet of the storage module 17, so that the secondary fluid being the storage fluid is removed from the storage module and enters the first fluidic circuit 6.

The first fluidic circuit 6 is also advantageously fluidically connected to a hot source outlet 16 so that the secondary fluid being a hot source enters the first fluidic circuit 6.

The first fluidic circuit 6 is also advantageously fluidically connected to a cold source return 23 so that the secondary fluid being a cold source emerges from the first fluidic circuit 6.

According to a possibility not shown in the figures, the first fluidic circuit 6 is fluidically connected to an outlet of the storage module 17, to a hot source outlet 16, and to a cold source return 23 by three separate fluidic connections. According to another possibility shown in the figures, the first fluidic circuit 6 is fluidically connected to an outlet of the storage module 17, to a hot source outlet 16 and to a cold source return 23 by a first common pipe 10.

The first fluidic circuit 6 is advantageously fluidically connected to a return to the storage module 18, so that the secondary fluid being the storage fluid is stored in the storage module on leaving the first fluidic circuit 6.

The first fluidic circuit 6 is advantageously fluidically connected to a hot source return 21, so that the secondary fluid being a hot source leaves the first fluidic circuit 6 and advantageously returns to the heating means.

The first fluidic circuit 6 is also advantageously fluidically connected to the second fluidic circuit 8 so as to fluidically connect the first fluidic circuit 6 and the second fluidic circuit 8.

According to a possibility not shown in the figures, the first fluidic circuit 6 is fluidically connected to a return to the storage module 18, to a hot source return 21 and to the second fluidic circuit 8, by three separate fluidic connections. According to another possibility shown in the figures, the first fluidic circuit 6 is fluidically connected to a return to the storage module 18, to a hot source return 21 and to the second fluidic circuit 8, by a second common pipe 11.

The second fluidic circuit 8 is advantageously fluidically connected to a return to the storage module 20, so that the secondary fluid being the storage fluid is stored in the storage module on leaving the second fluidic circuit 8.

The second fluidic circuit 8 is advantageously also fluidically connected to a hot source outlet 19 so that the secondary fluid being a hot source enters the second fluidic circuit 8.

The second fluidic circuit 8 is advantageously also fluidically connected to a cold source outlet 24 so that the secondary fluid being a cold source enters the second fluidic circuit 8.

According to a possibility not shown in the figures, the second fluidic circuit 8 is fluidically connected to a return to the storage module 20, to a hot source outlet 19 and to a cold source outlet 24 by three separate fluidic connections. According to another possibility shown in the figures, the first fluidic circuit 8 is fluidically connected to a return to the storage module 20, to a hot source outlet 19 and to a cold source outlet 24 by a first common pipe 12.

The second fluidic circuit 8 is advantageously fluidically connected to a hot source return 21, so that the secondary fluid being a hot source leaves the second fluidic circuit 8.

The second fluidic circuit 8 is advantageously fluidically connected to a cold source return 25, so that the secondary fluid being a cold source leaves the second fluidic circuit 8 and advantageously returns either to the cooling network or to an intermediate cooling module. .

The second fluidic circuit 8 is also advantageously also fluidically connected to the first fluidic circuit 6 so as to fluidically connect the first fluidic circuit 6 and the second fluidic circuit 8.

According to a possibility not shown in the figures, the second fluidic circuit 8 is fluidically connected to a hot source return 21, to a cold source return 25 and to the first fluidic circuit 6 by three separate fluidic connections. According to another possibility shown in the figures, the first fluidic circuit 8 is fluidically connected to a hot source return 21, to a cold source return 25 and to the first fluidic circuit 6 by a second common pipe 13.

The heat exchanger 1 comprises a module for controlling the circulation of the main fluid 5 and of the secondary fluid being the hot source, the cold source and/or the storage fluid and comprising a plurality of valves.

The heat exchanger comprises a module for measuring physical parameters of the heat exchanger, such as the temperature T _{STW , from} of the main fluid 5 at the inlet 3 of the main circulation zone 2 and/or the temperature T _{STW, to} of the main fluid 5 at the outlet 4 of the main circulation zone 2 and/or the temperature T _R,1 of the secondary fluid at the inlet of the first fluidic circuit 6.

The description of the figures is made for the application of the heat exchanger and the recovery unit in a sterilization device, but this may be adapted to any type of device requiring heating and cooling of fluid shifted in the time.

Figures 1 to 3 illustrate the heat exchanger 1 in operation during the heating phase of the main fluid, each figure corresponds to a time of this heating phase.

FIG. 1 illustrates a heat exchanger 1 in the heating phase of the main fluid 5 solely by discharging the thermal energy stored in the storage module.

In Figure 1, it is assumed that the thermal energy storage module is loaded with thermal energy. The storage module has been previously charged by recovering the heat during a cooling phase of a previous cycle.

At the start of the heating of the sterilization device, the thermal energy restored by the thermal storage module is at a sufficient temperature level to allow the main fluid 5 intended to supply the sterilization device to follow a set temperature. The temperature T_{R ,1} of the storage fluid at the start of the storage module is higher than the temperature T_{STW, from}of the main fluid 5 at the inlet 3 of the main circulation zone 2 of the heat exchanger 1. The main fluid 5 is heated solely by the thermal energy of the storage module. The storage fluid leaves the storage module through the start of the storage module 17 advantageously fluidically connected to the first pipe 10 of the first fluid circuit 6. The storage fluid enters the first fluid circuit 6 and circulates to exchange with the main fluid 5 circulating the first part of the main circulation zone 2 between the inlet 3 and the outlet 4. Advantageously, the exchange between the storage fluid and the main fluid 5 takes place locally by cross-current with a co-current orientation, The storage fluid emerges from the first fluidic circuit 6 advantageously via the second pipe 11.

According to a first preferred possibility, the second conduit 11 of the first fluidic circuit 6 is fluidically connected to the second conduit 13 of the second fluidic circuit 8 so that the first fluidic circuit 6 and the second fluidic circuit 8 are fluidically connected by a fluidic connection 22 The storage fluid also circulates in the second fluidic circuit 8 to exchange with the main fluid 5, before exiting, preferably via the first conduit 12, from the second fluidic circuit 8. Advantageously, the exchange between the storage fluid and the main fluid 5 is done locally by cross-current with a co-current orientation, the storage fluid returns to the storage module through the return 20. The circulation control module advantageously comprises a valve V_{stock ,from}intended to control the outlet of the storage fluid from the storage module preferably arranged on the outlet of the storage module 17. The circulation control module advantageously comprises a valve V_bypassintended to fluidically connect the first fluidic circuit 6 and the second fluidic circuit 8 preferably arranged on the fluidic connection 22. The circulation control module advantageously comprises a valve V_{stock , to} intended to put the first conduit 12 of the second fluidic circuit 8 in fluidic connection with the storage module to allow return of the storage fluid from the second fluidic circuit 8 to the storage module, preferably arranged on the return to the storage module 20 V valves_{stock ,from}, V_bypass, V_{stock , to}are open in the configuration of Figure 1. According to this first possibility, the two parts, the first part 7 and the second part 9, of the heat exchanger, more precisely of the main circulation zone 2, are used which presents the advantage of using a larger exchange surface.

According to a second possibility, the second pipe 11 of the first fluidic circuit 6 is not fluidly connected to the second pipe 13 of the second fluidic circuit 8, so that the storage fluid circulates in the first fluidic circuit 6 and comes out of it. ci by the second pipe 11 fluidically connected to the storage module so that the storage fluid returns to the storage module, without circulating in the second fluidic circuit 8. This configuration is implemented for example when the temperature T _{R, 1} is very high in relation to the temperature T _{STW, from} and in relation to the setpoint temperature. This configuration thus avoids causing unnecessary pressure drops in the storage fluid when its circulation only in the first fluidic circuit 6 is sufficient to heat the main fluid 5.

The V valve_{stock ,from} is controlled according to the acquisition of the temperature T_{STW, to} of the main fluid at the outlet 4 of the main circulation zone 2, so that the temperature T_{STW, to} reaches a set temperature.

As soon as the temperature of the storage fluid and therefore the thermal energy restored by the storage module no longer allows the main fluid 5, intended to be used by the sterilization device, to follow a set temperature then, the heat exchanger according to the invention operates according to Figure 2.

The mode of operation of Figure 2 is thus implemented when the temperature T_{R ,1}of the storage fluid at the outlet of the storage module is higher than the temperature T_{STW, from} of the main fluid at the inlet 3 of the main circulation zone 2, but that the temperature T_{STW, to} is below a set temperature.

The thermal energy restored by the storage module thus allows the preheating of the main fluid intended to supply the sterilization device by using the first part 7 of the partitioned heat exchanger. To reach a setpoint temperature of the main fluid 5, the second part 9 of the heat exchanger is fed by a hot source, preferably a steam network, and thus provides additional heat to the main fluid 5 exiting from the first part. 7.

The main fluid 5 is preheated by the thermal energy of the storage module at the level of the first fluidic circuit 6. The storage fluid leaves the storage module through the outlet of the storage module 17 fluidically connected to the first fluidic circuit 6, preferably by the first pipe 10. The storage fluid enters the first fluidic circuit 6 and circulates to exchange, advantageously in cross-current, with the main fluid 5 circulating in the first part 7 of the main circulation zone 2 between the inlet 3 and the outlet 4. The storage fluid exits from the first fluid circuit 6, advantageously via the second pipe 11, to return to the storage module via the return 18. The circulation control module advantageously comprises a valve V_{stock , to 2}intended to put the second pipe 11 of the first fluidic circuit 6 in fluidic connection with the storage module to allow the return of the storage fluid from the first fluidic circuit 6 to the storage module. The V valve_{stock , to 2}preferably arranged on the return to the storage module 18 is open. The V valve_bypass is closed so that the fluidic connection 22 between the first fluidic circuit 6 and the second fluidic circuit 8 is inactive. The first fluidic circuit 6 and the second fluidic circuit 8 are fluidically independent.

The main fluid 5 is then heated by the hot source in the second part 9 of the heat exchanger. The second fluidic circuit 8 is fluidically connected to the hot source outlet 19, preferably by the first pipe 12. The circulation control module advantageously comprises a valve V_steam,2intended to put the first pipe 12 of the second fluid circuit 8 in fluidic connection with the hot source to allow the hot source, for example from heating means, to enter the second fluid circuit 8 preferentially via the first pipe 12. The valve V_{steam ,2}preferably arranged on a hot source departure departure 19 is open. The hot source is advantageously steam, for example from heating means such as a boiler. The hot source circulates in the second fluidic circuit 8 and transmits the thermal energy to the main fluid 5 circulating in the second part 9 of the main circulation zone 2 in the direction of the outlet 4. The hot source leaves the second fluidic circuit 8, preferably by the second pipe 13 fluidically connected to a hot source return 21, preferably connected to the heating means such as a boiler. The hot source from the second fluidic circuit is a steam condensate. The circulation control module advantageously comprises a valve V_conditionarranged on the return of the hot source 21 which is open to allow the return of the condensate to the heating means. The V valve_{steam ,2} is controlled according to the acquisition of the temperature T_{STW, to}so that this temperature T_{STW, to} is equal to a setpoint temperature.

As soon as the thermal energy restored by the storage module is lower than the temperature of the main fluid 5 at the inlet of the heat exchanger, the storage module ceases to supply the heat exchanger. The heating of the main fluid 5 is then provided solely by the hot source, preferably the steam network, supplying according to the embodiment one part or both parts of the heat exchanger. The heat exchanger works according to figure 3.

In FIG. 3, the temperature T _{R ,1} of the storage fluid at the outlet of the storage module is lower than the temperature T _{STW,fr o m} of the main fluid 5 at the inlet 3 of the main circulation zone 2. The valves V _vap1 , V _vap2 , V _bypass and V _cond are open.

The first fluidic circuit 6 is fluidically connected, preferably via the first pipe 10, to the hot source outlet 16. The circulation control module advantageously comprises a valve V _vap1 , arranged on the hot source outlet 16, which is open from so as to allow the entry of the hot source, preferably steam, into the first fluidic circuit 6. The hot source circulates in the first fluidic circuit 6, preferably as far as the second conduit 11. The hot source exchanges thermal energy to the main fluid 5 by exchange, advantageously by cross-current. The hot source leaves the first fluidic circuit 6, preferably through the second pipe 11, fluidly connected to a hot source return 21, the valve V _cond arranged on the hot source return 21 is open.

According to one possibility, the main fluid 5 is also heated in the second part 9 of the heat exchanger. The second fluidic circuit 8 is fluidically connected, preferably via the first pipe 12, to the hot source outlet 19, the valve V _vap2 arranged on the hot source outlet 19 is open so as to allow the entry of the hot source, preferably of steam, in the second fluidic circuit 8. The hot source circulates in the second fluidic circuit 8, preferably as far as the second conduit 13. The hot source exchanges its thermal energy towards the main fluid 5, advantageously by cross-current exchange. The hot source leaves the second fluidic circuit 8 preferentially through the second pipe 13, fluidically connected to a hot source return 21, the valve V _cond arranged on the hot source return 21 is open. According to this possibility, the second conduit 11 of the first fluidic circuit 6 and the second conduit 13 of the second fluidic circuit 8 are advantageously fluidically connected by the fluidic connection 22, the _bypass valve V being open. In this way, the hot source returns respectively of the first fluidic circuit 6 and of the second fluidic circuit 8 are fluidically connected to ensure a common return of the condensates from the hot source to, for example, the boiler.

Figures 4 to 7 illustrate the heat exchanger 1 in operation during the cooling phase of the main fluid, each figure corresponding to a time of this cooling phase.

The cooling phase of the sterilization device corresponds to the phase during which the thermal storage module is charged with thermal energy.

FIG. 4 corresponds to the start of the cooling of the main fluid 5, that is to say after the phase of heating and possibly maintaining the temperature of the sterilization device. The temperature T_{R ,1} of the storage fluid at the outlet of the storage module is lower than the temperature T_{STW, from}of the main fluid 5 at the inlet 3 of the main circulation zone 2. The valves V_{stock ,from}, V_{stock , to 1}, V_bypassare open.

The cooling of the main fluid 5 is ensured solely by the storage fluid. The first fluidic circuit 6 is fluidically connected, preferably by the first conduit 10, from the storage module 17, the valve V_{stock ,from} , allowing the storage fluid to exit the storage module and enter the first fluid circuit 6, is open. The storage fluid circulates in the first fluidic circuit 6 and exchanges with the main fluid 5 circulating in the first part 7 by local exchange, advantageously by cross-current, either by co-current as illustrated in FIG. 4, or by counter-current as illustrated in Figure 7. The countercurrent circulation of the storage fluid and the main fluid 5 is defined according to the cycles of the sterilization device, in this case, the embodiment illustrated in Figure 7 with a circulation against the current is chosen when the main fluid 5 is cooled by the storage fluid itself directly cooled in the storage module by a cold source. The main fluid 5 transfers its thermal energy to the storage fluid. The storage fluid emerges from the first fluidic circuit 6, preferentially via the second pipe 11 fluidically connected preferentially to the second pipe 13 of the second fluidic circuit 8 via the fluidic connection 22, the valve V_bypass being open. The storage fluid enters the second fluidic circuit 8, preferably via the second pipe 13, and circulates in the second fluidic circuit 8. The storage fluid exchanges with the main fluid 5 flowing in the second part 9. The main fluid 5 yields its thermal energy to the storage fluid. The storage fluid comes out of the second fluid circuit 8, preferably via the first pipe 12. The second fluid circuit 8 is fluidically connected, preferably via the first pipe 12, to a storage return 20, a valve V_{stock , to} being open. The V valve_{stock ,from}is controlled according to the acquisition of the temperature T_{STW, to}so that this temperature T_{STW, to} is equal to a setpoint temperature.

As soon as T_{STW , to} becomes higher than a set temperature, the storage fluid no longer makes it possible on its own to ensure the cooling of the main fluid 5. The exchanger then operates according to the embodiment illustrated in FIG. 5.

The thermal energy that can be captured by the storage fluid thus makes it possible to precool the main fluid 5 at the outlet of the sterilization device by using the first part 7 of the partitioned heat exchanger. To reach a setpoint temperature of the main fluid 5, the second part 9 of the heat exchanger is supplied by a cold source, preferably a cold network, and thus provides in the second part 9 the cooling necessary for the main fluid 5 exiting from the first part 7 of the heat exchanger.

The pre-cooling of the main fluid 5 is ensured by the storage fluid. The first fluidic circuit 6 is fluidically connected, preferably by the first pipe 10, from the storage module 17, the valve V_{stock ,from} allowing the storage fluid to exit the storage module and enter the first fluid circuit 6 is open. The storage fluid circulates in the first fluid circuit 6 and exchanges with the main fluid 5 by local exchange, advantageously by cross-current, counter-current particularly if the heat exchanger is made up of welded plates. The main fluid 5 circulating in the first part 7 preferentially transfers its thermal energy to the storage fluid. The storage fluid leaves the first fluidic circuit 6 via the second pipe 11. The second pipe 11 is fluidly connected to the return to the storage module 18. The storage fluid returning to the storage module without circulating in the second fluidic circuit 8. The first fluidic circuit 6 and the second fluidic circuit 8 are fluidically independent, the valve V_bypassbeing closed. The fluidic connection 22 is inactive.

The second fluidic circuit 8 is fluidically connected, preferably by the first conduit 12, from a cold source 24. A valve V_{cool ,in} arranged on the cold source outlet 24 being open to allow entry of the cold source, preferably city water, into the second fluidic circuit 8, preferably via the first pipe 12. The cold source circulating in the second fluidic circuit 8 recovers the thermal energy transferred by the main fluid 5 circulating in the second part 9 preferably in cross current, against the current particularly if the heat exchanger is composed of welded plates. The cold source emerges from the second fluidic circuit 8, preferably via the second pipe 13 fluidically connected to a cold source return 25, a valve V_{cool ,out2} arranged on the cold source return 25 being open.

The V valve_{cool ,in}is controlled according to the acquisition of the temperature T_{STW, to}so that this temperature T_{STW, to} is equal to a setpoint temperature.

As soon as the temperature T _{R ,1} of the storage fluid at the outlet of the storage module is greater than the temperature T _{STW, from} of the main fluid 5 at the inlet 3 of the main circulation zone 2, the storage fluid does not allows more to ensure the cooling of the main fluid 5. The storage module stops supplying the heat exchanger. The exchanger then operates according to the embodiment illustrated in Figure 6.

The cooling of the main fluid 5 is provided solely by the cold source, preferably the city water network, supplying according to the embodiment one part or both parts of the heat exchanger.

According to a first possibility, the circulation of the cold source takes place successively in the second part 9 then in the first part 7 of the heat exchanger. This circulation of the cold source makes it possible to ensure a local exchange by cross-current with a counter-current orientation improving the heat exchange between the cold source and the main fluid 5. The cold source penetrates into the second fluidic circuit 8, preferably by the second line 12 fluidly connected to the start of the cold source 24, the valve V_cool being open to allow the entry of the cold source, preferably city water, into the second fluidic circuit 8, preferably via the first pipe 12. The cold source circulating in the second fluidic circuit 8 recovers the thermal energy transferred by the main fluid 5 circulating in the second part 9 preferentially in cross-current with counter-current orientation. The cold source emerges from the second fluid circuit 8, preferably via the second pipe 13 fluidly connected to the second pipe 11 of the first fluid circuit 6 via the fluid connection 22, the valve V_bypassbeing open. The cold source enters the first fluidic circuit 6 through which it circulates before exiting through the first pipe 10. The first pipe 10 being fluidically connected to a cold source return 23, the valve V_{cool ,out1}being open.

The V valve_{cool ,in}is controlled according to the acquisition of the temperature T_{STW, to}so that this temperature T_{STW, to} is equal to a setpoint temperature.

The invention is not limited to the embodiments described above and extends to all the embodiments covered by the claims.

List of references
1 heat exchanger
2 Main traffic area
3 Main fluid inlet
4 Main fluid outlet
5 Main fluid
6 First fluid circuit
7 Part One
8 Second fluidic circuit
9 Part Two
10 First Ride
11 Second drive
12 First ride
13 Second drive

16 Hot spring flow
17 Storage module outlet
18 Storage module return
19 Hot spring outlet
20 Return storage module
21 Hot source return
22 Fluidic connection between first fluidic circuit and second fluidic circuit
23 Cold source return
24 Cold source flow
25 Cold source return
V_steam,1 valve controlling the entry of the hot source into the first conduit of the first fluidic circuit
V_steam2 valve controlling the entry of the hot source into the first pipe of the second fluidic circuit
V_{stock , from}valve controlling the entry of storage fluid into the first conduit of the first fluidic circuit
V_{stock , to 1} valve controlling the outlet of the storage fluid through the first pipe of the second fluidic circuit
V_{stock , to 2} valve controlling the outlet of the storage fluid through the second pipe of the first fluidic circuit
V_{cool , in,}valve controlling the entry of the cold source through the first pipe of the second fluidic circuit
V_condition valve controlling the outlet of the hot source through the second pipe of the second fluidic circuit
V_{cool , out1}valve controlling the outlet of the cold source through the first pipe of the first fluidic circuit
V_{cool , out2} valve controlling the outlet of the cold source through the second pipe of the second fluidic circuit
T_R,1temperature of the storage fluid at the outlet of the storage module at the inlet of the first fluidic circuit
T_{STW, from}temperature of the main fluid entering the main circulation zone
T_{STW, to} temperature of the main fluid leaving the main circulation zone

Claims (15)

Heat exchanger (1) comprising:

• a main circulation zone (2) capable of receiving a main fluid (5), and
• circulation means capable of receiving a secondary fluid and configured to ensure heat exchange with the main circulation zone (2),

Characterized in that:

• the main circulation area (2) comprises a first part (7) and a second part (9), and
• means of circulation include
  • a first fluidic circuit (6) arranged in contact with the first part (7) of the heat exchanger (1) and intended to receive the secondary fluid so as to ensure a heat exchange between the secondary fluid and the main fluid (5) circulating in the first part (7),
  • a second fluidic circuit (8) arranged in contact with the second part (9) of the heat exchanger (1) and intended to receive the secondary fluid, so as to ensure a heat exchange between the secondary fluid and the main fluid (5 ) circulating in the second part (9),
  • the first fluidic circuit (6) and the second fluidic circuit (8) being configured to be alternately fluidically independent or to be fluidically connected to each other.

Heat exchanger (1) according to the preceding claim, in which the exchanger is a plate exchanger. Recovery unit comprising a heat exchanger (1) according to any one of the preceding claims and a thermal energy storage module fluidically connected to the first fluidic circuit (6) and to the second fluidic circuit (8) so as to be able to storing and retrieving the secondary fluid. Recovery unit according to the preceding claim, in which the first fluidic circuit (6) and the second fluidic circuit (8) are capable of being connected to a hot source and to a cold source, so as to ensure heating of the main fluid (5 ) alternately by the thermal energy stored in the storage module or by a heat source or by a combination of the thermal energy stored in the storage module and by the heat source and so as to ensure cooling of the main fluid ( 5) alternatively by the thermal energy stored in the storage module or by a cold source or by a combination of the thermal energy stored in the storage module and by the cold source. Upgrading unit according to any one of Claims 3 or 4, in which the first fluidic circuit (6) is configured to be fluidically connected:

• at an outlet from the storage module (17) so as to allow the entry of the secondary fluid being a storage fluid into the first fluidic circuit (6),
• to a hot source inlet (16) so as to allow the entry of the secondary fluid being a hot source into the first fluid circuit (6),
• to a cold source return (23) so as to allow the output of the secondary fluid being a cold source out of the first fluidic circuit (6).

Energy recovery unit according to any one of Claims 3 to 5, in which the first fluidic circuit (6) is configured to be fluidically connected:

• to a return to the thermal energy storage module (18) so as to allow the exit of the secondary fluid being the storage fluid from the first fluidic circuit (6) and to allow the storage of thermal energy in the storage module 'thermal energy
• to a second pipe (13) of the second fluidic circuit (8) so as to put the first fluidic circuit (6) and the second fluidic circuit (8) in fluidic connection,
• to a return of the hot source (21) so as to allow the output of the secondary fluid being the hot source out of the first fluidic circuit (6).

Upgrading unit according to any one of Claims 3 to 6, in which the second fluidic circuit (8) is configured to be fluidically connected:

• at an inlet of a hot source (19) so as to allow entry of the secondary fluid being the hot source into the second fluidic circuit (8)
• to a return to the thermal energy storage module (20) so as to allow the exit of the secondary fluid being the storage fluid from the second fluidic circuit (8) and to allow the storage of thermal energy in the storage module thermal energy,
• at a departure from a cold source (24) so as to allow entry of the secondary fluid being the cold source into the second fluid circuit (8).

Energy recovery unit according to any one of claims 3 to 7 in which the second fluidic circuit (8) is configured to be fluidically connected to

• a second conduit (11) of the first fluidic circuit (6) so as to bring the first fluidic circuit (6) and the second fluidic circuit (8) into fluidic connection
• to a return of the hot source (21) so as to allow the exit of the secondary fluid being the hot source from the second fluidic circuit (8)
• to a cold source return (25) so as to allow the exit of the secondary fluid being the cold source from the second fluidic circuit (8).

Recovery unit according to any one of Claims 3 to 8, in which the hot source is steam from a boiler. Recovery unit according to any one of Claims 3 to 9, in which the cold source is water from a cold network. Recovery unit according to any one of claims 3 to 10 comprising a module for controlling the circulation of the main fluid and of the secondary fluid, the secondary fluid being the hot source, the cold source and/or the storage fluid, comprising a plurality of valves. A sterilization device comprising a sterilizer and a recovery unit according to any one of claims 3 to 11, the main fluid being used as the sterilization fluid in the sterilization device. Use of a recovery unit according to any one of claims 3 to 11 in a steriliser. Process for recovering thermal energy by a recovery unit according to any one of Claims 3 to 11, in which during a step of heating the main fluid (5) so that the temperature T_{STW, to ,}of the main fluid (5) at the outlet (4) of the main circulation zone (2) reaches a setpoint temperature:

• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is higher than the temperature T _{STW, from} of the main fluid (5) at the inlet (3) of the main circulation zone (2), the first circuit fluidic circuit (6) and the second fluidic circuit (8) are fluidically connected, the storage fluid circulates successively in the first fluidic circuit (6) then the second fluidic circuit (8) so as to ensure heat exchange of the storage fluid towards the main fluid (5), or
• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is higher than the temperature T _{STW, from} of the main fluid (5) at the inlet (3) of the main circulation zone (2) and that the temperature T _{STW, to} of the main fluid (5) at the outlet (4) of the main circulation zone (2) is below a set temperature, the first fluid circuit (6) and the second fluid circuit (8) are fluidically independent , the first fluidic circuit (6) ensures the preheating of the main fluid (5) by the storage fluid removed from the storage module and circulating in the first fluidic circuit (6) and the second fluidic circuit (8) ensures the heating of the fluid main (5) by a hot source circulating in the second fluidic circuit (8), or
• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is lower than the temperature T _{STW, from} of the main fluid (5) at the inlet (3) of the main circulation zone (2), the first circuit fluidic circuit (6) and the second fluidic circuit (8) are fluidically independent, the first fluidic circuit (6) ensures the preheating of the main fluid (5) by a hot source and the second fluidic circuit (8) ensures the heating of the main fluid (5) by a hot spring.

Process for recovering thermal energy by a recovery unit according to any one of Claims 3 to 11, in which during a step of cooling the main fluid so that the temperature T_{STW, to ,}of the main fluid leaving the main circulation zone reaches a set temperature:

• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is lower than the temperature T _{STW, from} of the main fluid (5) at the inlet (3) of the main circulation zone (2), the first circuit fluidic circuit (6) and the second fluidic circuit (8) are fluidically connected, the storage fluid circulates successively in the first fluidic circuit (6) then the second fluidic circuit (8) so as to cool the main fluid (5) and store thermal energy in the storage module,
• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is lower than the temperature T _{STW, from} of the main fluid (5) at the inlet (3) of the main circulation zone (2), the first circuit fluidic circuit (6) and the second fluidic circuit (8) are fluidically independent, the first fluidic circuit (6) ensures the precooling of the main fluid (5) by the storage fluid removed from the storage module and the second fluidic circuit (8) ensures the cooling of the main fluid (5) by a cold source,
• when the temperature of the storage fluid at the outlet of the storage module T _R,1 is higher than the temperature T _{STW, from} of the main fluid (5) at the inlet (3) of the main circulation zone (2), the first circuit fluidic circuit (6) and the second fluidic circuit (8) are fluidically connected, the cold source circulating successively in the second fluidic circuit (8) then in the first fluidic circuit (6).