HEAT CONDITIONING SYSTEM

Description

Technical field

[0001] The present invention relates to the field of thermal conditioning systems. These systems can in particular be fitted to a motor vehicle. Such systems allow, for example, thermal regulation of various parts of the vehicle, such as the passenger compartment or an electrical energy storage battery, in the case of an electrically powered vehicle. Heat exchanges are managed mainly by the compression and expansion of a refrigerant fluid within several heat exchangers. Prior art

[0002] Thermal conditioning systems commonly use a refrigerant loop and a heat transfer fluid loop exchanging heat with the refrigerant. Such systems are therefore called indirect systems. Patent EP2933586 B1 or document CN 209 274 301 U are examples. The refrigerant loop is formed so that the refrigerant transfers heat to a heat transfer fluid in a two-fluid exchanger, then passes through a heat exchanger located in the passenger compartment, also called an evaporator. This heat exchanger cools the passenger compartment. Heating of the passenger compartment is provided in particular by a heating radiator which dissipates the heat from the heat transfer fluid into the airflow sent to the passenger compartment.

[0003] The various heat exchangers are traditionally distributed in different locations within the vehicle. Some exchangers are located in the passenger compartment of the vehicle. Other exchangers are located under the hood, near the front of the vehicle. The various components of the thermal conditioning system are connected by pipes allowing the circulation of the refrigerant and heat transfer fluid. Integrating all the components can be difficult. In addition, during vehicle assembly, each component must be installed in turn. The refrigerant circuit must be filled once assembly is complete, and a check of the circuit's tightness and proper operation of the assembly must then be carried out. The assembly and inspection time is therefore relatively long.

[0004] There is therefore a need for thermal conditioning systems that are easier to integrate and can be delivered in the form of a module that is already tested and ready to operate. In addition, it is interesting to have thermal conditioning systems that allow greater standardization of the components used. Summary

[0005] To this end, the present invention, as defined in claim 1, provides a thermal conditioning system comprising: a heat transfer fluid circuit comprising: a main circulation loop, a secondary loop, a first branch, a second branch, a refrigerant circuit comprising a main refrigerant circulation loop comprising successively, according to a direction of circulation of the refrigerant: -- a compression device, -- a first two-fluid exchanger arranged jointly on the refrigerant circuit and on the main loop of the heat transfer fluid circuit so as to allow heat exchange between the refrigerant and the heat transfer fluid of the main loop, -- a second two-fluid exchanger arranged jointly on the refrigerant circuit and on the main loop of the heat transfer fluid circuit so as to allow heat exchange between the refrigerant and the heat transfer fluid of the main loop, -- a first expansion device,-- a third two-fluid exchanger arranged jointly on the refrigerant circuit and on the secondary loop of the heat transfer liquid circuit so as to allow heat exchange between the refrigerant and the heat transfer liquid of the secondary loop, wherein the first branch of the heat transfer fluid circuit connects a first connection point arranged on the main loop to a second connection point arranged on the main loop, the first branch being configured so that the heat transfer fluid at the outlet of the first dual-fluid exchanger returns to an inlet of the first dual-fluid exchanger without passing through the second dual-fluid exchanger, the first branch comprising a second heat exchanger configured to exchange heat with a second air flow, and wherein the second bypass branch of the heat transfer fluid circuit connects a third connection point arranged on the first branch downstream of the second heat exchanger to a fourth connection point arranged on the main loop upstream of the second dual-fluid exchanger, the second bypass branch comprising a third heat exchanger configured to exchange heat with the second air flow.

[0006] The proposed structure for the thermal conditioning system, with two bi-fluid exchangers in series in the direction of refrigerant circulation, each bi-fluid exchanger being coupled to a heat exchanger that can absorb or dissipate heat in the second air flow, allows multiple operating modes to optimize thermodynamic performance depending on the operating conditions. The proposed structure is particularly simple for the refrigerant circulation lines, which allows for a compact refrigerant circuit, using a small amount of refrigerant.

[0007] The features listed in the following paragraphs can be implemented independently of each other or in any technically possible combination.

[0008] The main loop of the heat transfer fluid circuit comprises a first heat exchanger configured to exchange heat with a first air flow.

[0009] The thermal conditioning system is a thermal conditioning system of a motor vehicle.

[0010] The first airflow is an airflow inside a passenger compartment of a motor vehicle.

[0011] The second airflow is an airflow outside a vehicle cabin.

[0012] The third heat exchanger is arranged upstream of the second heat exchanger in a flow direction of the second air flow.

[0013] The third two-fluid exchanger is configured to be thermally coupled with a first element of an electric powertrain of a motor vehicle.

[0014] The first element of the vehicle's electric powertrain is configured to exchange heat with the heat transfer fluid circulating in the secondary heat transfer fluid loop.

[0015] The first element of the vehicle's electric powertrain includes an electric vehicle traction motor.

[0016] The first element of the vehicle's electric drive train is an electronic module for controlling the vehicle's electric traction motor.

[0017] The primary loop of the heat transfer fluid circuit and the secondary loop of the heat transfer fluid circuit are configured to be in communication.

[0018] The secondary loop of the heat transfer fluid circuit is fluidically connected to the first branch of the heat transfer fluid circuit.

[0019] The heat transfer fluid circuit comprises a third branch connecting a fifth connection point arranged on the first branch between the first connection point and the second heat exchanger to a sixth connection point arranged on the secondary loop downstream of the first element.

[0020] The heat transfer fluid circuit comprises a fourth branch connecting a seventh connection point arranged on the secondary loop upstream of the first element to an eighth connection point arranged on the first branch between the third connection point and the second connection point.

[0021] The refrigerant circuit comprises a first bypass branch connecting a first connection point arranged on the main loop downstream of the second dual-fluid exchanger and upstream of the third dual-fluid exchanger to a second connection point arranged on the main loop downstream of the third dual-fluid exchanger and upstream of the compression device, the first bypass branch comprising a fourth dual-fluid exchanger configured to be thermally coupled with a second element of an electric powertrain of the vehicle.

[0022] The fourth two-fluid exchanger is configured to exchange heat with a heat transfer fluid circulating in an auxiliary loop.

[0023] The second element of the electric powertrain is arranged on the auxiliary heat transfer fluid loop. The second element of the vehicle's electric powertrain is configured to exchange heat with the heat transfer fluid in the auxiliary loop.

[0024] The second element of the vehicle's electric powertrain is an electric energy storage battery.

[0025] The first branch of the bypass comprises a second expansion device arranged upstream of the fourth two-fluid exchanger.

[0026] The first connection point is located on the main loop of the refrigerant circuit upstream of the first expansion device.

[0027] The main loop of the refrigerant circuit includes a refrigerant accumulation device located downstream of the third two-fluid exchanger and upstream of the compression device.

[0028] The main loop of the refrigerant circuit includes a refrigerant accumulation device located downstream of the third two-fluid exchanger and upstream of the second connection point.

[0029] The main loop of the refrigerant circuit comprises a refrigerant accumulation device arranged downstream of the second connection point and upstream of the compression device.

[0030] The refrigerant circuit comprises a second bypass branch connecting a third connection point arranged on the main loop downstream of the second dual-fluid exchanger and upstream of the first connection point to a fourth connection point arranged on the main loop downstream of the third dual-fluid exchanger and upstream of the second connection point, the second bypass branch successively comprising a third expansion device and a fourth heat exchanger configured to exchange heat with the first air flow.

[0031] The fourth heat exchanger is arranged upstream of the third heat exchanger in a flow direction of the second air flow.

[0032] The refrigerant circuit comprises a third bypass branch connecting a fifth connection point arranged on the main loop downstream of the compression device and upstream of the second dual-fluid exchanger to a sixth connection point arranged on the main loop downstream of the fifth connection point, the third bypass branch comprising a fifth heat exchanger configured to exchange heat with the second air flow.

[0033] The fifth heat exchanger is arranged downstream of the second heat exchanger in a flow direction of the second air flow.

[0034] The refrigerant circuit comprises a fourth bypass branch connecting a seventh connection point arranged on the main loop downstream of the fourth connection point and upstream of the compression device to an eighth connection point arranged on the third bypass branch downstream of the fifth connection point and upstream of the fifth heat exchanger.

[0035] The refrigerant circuit comprises a fifth bypass branch connecting a ninth connection point arranged on the main loop downstream of the third connection point and upstream of the third two-fluid exchanger to a tenth connection point arranged on the third bypass branch downstream of the fifth heat exchanger and upstream of the sixth connection point, and the fifth bypass branch comprises a fourth expansion device.

[0036] According to one embodiment, the main loop of the refrigerant circuit comprises a sixth heat exchanger arranged upstream of the first expansion device, the sixth heat exchanger being configured to exchange heat with the first air flow.

[0037] The sixth heat exchanger is arranged upstream of the first two-fluid exchanger according to the direction of flow of the refrigerant fluid.

[0038] According to another embodiment of the thermal conditioning system, the refrigerant circuit comprises a sixth bypass branch connecting an eleventh connection point arranged on the main loop upstream of the first dual-fluid exchanger to a twelfth connection point arranged on the main loop downstream of the second dual-fluid exchanger, and in which the sixth bypass branch comprises a sixth heat exchanger configured to exchange heat with the first air flow.

[0039] The main loop of the refrigerant circuit has a first shut-off valve arranged between the fifth connection point and the sixth connection point.

[0040] The third branch branch has a second shut-off valve located between the fifth connection point and the eighth connection point.

[0041] The fourth branch branch has a third shutoff valve.

[0042] The third bypass branch comprises a first non-return valve configured to block a flow of refrigerant fluid from the sixth connection point to the tenth connection point.

[0043] The fifth bypass branch includes a second check valve configured to block a flow of refrigerant fluid from the tenth connection point to the ninth connection point.

[0044] The main heat transfer fluid loop comprises a first heat transfer fluid circulation pump.

[0045] The first heat transfer fluid circulation pump is arranged between the first connection point and the second connection point.

[0046] The first circulation pump is configured to circulate the heat transfer fluid from the first two-fluid exchanger to the first connection point.

[0047] The secondary heat transfer fluid loop includes a second heat transfer fluid circulation pump.

[0048] The second heat transfer fluid circulation pump is arranged on the secondary loop between the seventh connection point and the sixth connection point.

[0049] The second heat transfer fluid circulation pump is configured to circulate the heat transfer fluid from the seventh connection point to the sixth connection point.

[0050] The main heat transfer fluid circulation loop comprises a first three-way valve arranged jointly on the main loop and on the first branch.

[0051] The secondary heat transfer fluid circulation loop includes a second three-way valve arranged jointly on the secondary loop and on the third branch.

[0052] The thermal conditioning system comprises a casing defining a receiving volume, and the main loop of the refrigerant circuit is contained inside the casing.

[0053] The casing defines a volume sealed against the refrigerant fluid.

[0054] The casing defines a closed volume in which the refrigerant circuit is contained.

[0055] The first branch of the refrigerant circuit is contained inside the housing.

[0056] The second branch of the refrigerant circuit comprises a first portion contained inside the casing, the casing comprises a first refrigerant inlet / outlet, the first portion connecting the third connection point and the ninth inlet / outlet.

[0057] The second branch of the refrigerant circuit comprises a second portion contained inside the casing, the casing comprises a second refrigerant inlet / outlet, the second portion connecting the fourth connection point and the second inlet / outlet.

[0058] The third trigger device is contained inside the housing.

[0059] The third branch of the refrigerant circuit comprises a third portion contained inside the casing, the casing comprises a third refrigerant inlet / outlet, the third portion connecting the fifth connection point and the third inlet / outlet.

[0060] The third branch of the refrigerant circuit has a fourth portion contained inside the casing, the casing has a fourth refrigerant inlet / outlet, the fourth portion connecting the sixth connection point and the fourth inlet / outlet.

[0061] The fourth branch branch is contained inside the housing.

[0062] The fifth branch is contained inside the housing.

[0063] The main loop of the heat transfer fluid circuit comprises a fifth portion contained inside the casing, the casing comprises a fifth heat transfer fluid inlet / outlet and a sixth heat transfer fluid inlet / outlet, the fifth portion connecting the fifth inlet / outlet and the sixth inlet / outlet, and the first two-fluid exchanger and the second two-fluid exchanger are arranged on the fifth portion.

[0064] The first heat transfer fluid circulation pump is contained inside the casing.

[0065] The first branch of the heat transfer fluid circuit comprises a sixth portion contained inside the casing, the casing comprises a seventh heat transfer fluid inlet / outlet, the sixth portion connecting the seventh inlet / outlet and the second connection point.

[0066] The second connection point is located inside the housing.

[0067] The second heat transfer fluid circuit branch comprises a seventh portion contained inside the casing, the receiving casing comprises an eighth heat transfer fluid inlet / outlet, and the seventh portion connects the eighth inlet / outlet and the fourth connection point.

[0068] The secondary heat transfer fluid circuit loop comprises an eighth portion contained inside the casing, the casing comprises a ninth heat transfer fluid inlet / outlet and a tenth heat transfer fluid inlet / outlet, the eighth portion connects the ninth inlet / outlet and the tenth inlet / outlet, and the third two-fluid exchanger is arranged on the eighth portion.

[0069] The main loop of the heat transfer fluid circuit has a ninth portion contained within the casing, the casing has an eleventh heat transfer fluid inlet / outlet and a twelfth heat transfer fluid inlet / outlet, the ninth portion connecting the eleventh inlet / outlet and the twelfth inlet / outlet.

[0070] The main loop of the heat transfer fluid circuit includes an electric heating device configured to heat the heat transfer fluid.

[0071] The electric heating device is located outside the housing.

[0072] The electric heating device is contained inside the housing.

[0073] The auxiliary loop of the heat transfer fluid circuit comprises a tenth portion contained inside the casing, the casing comprises a thirteenth heat transfer fluid inlet / outlet and a fourteenth heat transfer fluid inlet / outlet, the tenth portion connecting the thirteenth inlet / outlet and the fourteenth inlet / outlet, and the fourth two-fluid exchanger is arranged on the tenth portion.

[0074] The main loop comprises an internal heat exchanger, the internal heat exchanger comprising a first heat exchange section arranged downstream of the second dual-fluid exchanger and upstream of the first connection point and a second heat exchange section arranged downstream of the refrigerant accumulation device and upstream of the compression device, the internal heat exchanger being configured to allow heat exchange between the refrigerant in the first heat exchange section and the refrigerant in the second heat exchange section.

[0075] According to a method of operating a thermal conditioning system as described above, in a so-called cooling mode: the refrigerant fluid circulates in the compression device where it passes at high pressure, and circulates successively in the fifth heat exchanger where it gives off heat to the second air flow, in the first two-fluid exchanger, in the second two-fluid exchanger, in the third expansion device where it passes at low pressure, in the fourth heat exchanger where it absorbs heat from the first air flow, the low-pressure refrigerant fluid returning to the compression device, the heat transfer liquid circulates successively in the second two-fluid exchanger, in the first two-fluid exchanger, in the second heat exchanger where it gives off heat to the second air flow, is divided into a first flow circulating in the first branch and a second flow circulating in the second branch, the first flow joining the main loop upstream of the first two-fluid exchanger and the second flow joining the main loop upstream of the second two-fluid exchanger.

[0076] According to a method of operating a thermal conditioning system as described previously, in a so-called heating mode: the refrigerant circulates in the compression device where it passes at high pressure, and circulates successively in the first two-fluid exchanger where it transfers heat to the heat transfer liquid, in the second two-fluid exchanger where it transfers heat to the heat transfer liquid, in the fourth expansion device where it passes at low pressure, in the fifth heat exchanger where it absorbs heat from the second air flow, the low-pressure refrigerant returning to the compression device, the heat transfer liquid circulates successively in the second two-fluid exchanger where it receives heat from the refrigerant, in the first two-fluid exchanger where it receives heat from the refrigerant, in the first heat exchanger where it transfers heat to the first air flow.

[0077] According to a method of operating a thermal conditioning system as described above, in a so-called parallel dehumidification mode: the refrigerant circulates in the compression device where it passes at high pressure, and circulates successively in the first two-fluid exchanger where it transfers heat to the heat transfer liquid, in the second two-fluid exchanger where it transfers heat to the heat transfer liquid, is divided between a first flow and a second flow, the first flow circulating in the fourth expansion device where it passes at low pressure, in the fifth heat exchanger where it absorbs heat from the second air flow, the second flow circulating in the third expansion device where it passes at low pressure, in the fourth heat exchanger where it absorbs heat from the first air flow, the first flow of refrigerant at low pressure and the second flow of refrigerant at low pressure joining before joining the compression device,the heat transfer fluid circulates successively in the second two-fluid exchanger where it receives heat from the refrigerant, in the first two-fluid exchanger where it receives heat from the refrigerant, in the first heat exchanger where it gives off heat to the first air flow. Brief description of the drawings

[0078] Other features, details and advantages will become apparent upon reading the detailed description below, and upon analyzing the attached drawings, in which: [ Fig. 1 ] is a schematic view of a thermal conditioning system according to a first embodiment of the invention, [ Fig. 2 ] is a schematic view of a thermal conditioning system according to a second embodiment of the invention, [ Fig. 3 ] is a schematic view of a thermal conditioning system according to a first variant of the second embodiment of the invention, [ Fig. 4] is a schematic view of a thermal conditioning system according to a second variant of the second embodiment of the invention, [ Fig. 5 ] is a schematic view of a thermal conditioning system according to a third embodiment of the invention, [ Fig. 6 ] is a schematic view of a thermal conditioning system according to a variant of the third embodiment, [ Fig. 7 ] is a schematic view of a thermal conditioning system according to a fourth embodiment of the invention, [ Fig. 8 ] represents a schematic view of the thermal conditioning system of the figure 6 according to a first operating mode, called cooling mode, [ Fig. 9 ] represents a schematic view of the thermal conditioning system of the figure 6 according to a second mode of operation, called heating mode, [ Fig. 10 ] represents a schematic view of the thermal conditioning system of the figure 6 according to a third operating mode, called parallel dehumidification mode. Description of the embodiments

[0079] To facilitate reading the figures, the different elements are not necessarily represented to scale. In these figures, identical elements have the same references. Some elements or parameters may be indexed, i.e. designated for example by first element or second element, or first parameter and second parameter, etc. This indexing is intended to differentiate similar, but not identical, elements or parameters. This indexing does not imply a priority of one element or parameter over another. The names 'first', 'second', 'third', etc. may be interchanged.

[0080] In the following description, the term "a first element upstream of a second element" means that the first element is placed before the second element relative to the direction of circulation, or path, of a fluid. Similarly, the term "a first element downstream of a second element" means that the first element is placed after the second element relative to the direction of circulation, or path, of the fluid in question. In the case of the refrigerant circuit, the term "a first element is upstream of a second element" means that the refrigerant passes successively through the first element, then the second element, without passing through the compression device. In other words, the refrigerant leaves the compression device, possibly passes through one or more elements, then passes through the first element, then the second element, then returns to the compression device, possibly after passing through other elements.

[0081] When it is specified that a subsystem includes a given element, this does not exclude the presence of other elements in this subsystem.

[0082] Each of the expansion devices used can be an electronic expansion valve, a thermostatic expansion valve, or a calibrated orifice. In the case of an electronic expansion valve, the flow area for the refrigerant to pass through can be continuously adjusted between a closed position and a maximum opening position. To achieve this, the system control unit drives an electric motor that moves a movable shutter controlling the flow area offered to the refrigerant.

[0083] The compression device 7 may be an electric compressor, i.e. a compressor whose moving parts are driven by an electric motor. The compression device 7 comprises a suction side for the low-pressure refrigerant fluid, also called the inlet 7a of the compression device, and a discharge side for the high-pressure refrigerant fluid, also called the outlet 7b of the compression device 7. The internal moving parts of the compressor 7 cause the refrigerant fluid to pass from a low pressure on the inlet side to a high pressure on the outlet side. After expansion in one or more expansion members, the refrigerant fluid returns to the inlet 7a of the compressor 7 and begins a new thermodynamic cycle.

[0084] Each connection point allows the refrigerant to pass into one or other of the circuit sections joining at this connection point. The distribution of the refrigerant between the circuit sections joining at a connection point is achieved by opening or closing the shut-off valves or expansion devices included on each of the branches connected to this point. In other words, each connection point is a means of redirecting the refrigerant arriving at this connection point.

[0085] Shut-off valves and non-return valves thus make it possible to selectively direct the refrigerant fluid into the different branches of the refrigerant circuit, in order to ensure different operating modes, as will be described later.

[0086] The refrigerant used by refrigerant circuit 1 is a chemical fluid such as R1234yf. Other refrigerants could be used, such as R134a or R290.

[0087] It has been represented on the figure 1 a first embodiment of a thermal conditioning system 100 comprising: - a heat transfer fluid circuit 1 comprising: a main circulation loop 2, a secondary loop 3, a first branch 4, a second branch 5, - a refrigerant circuit 6 comprising a main refrigerant circulation loop A successively comprising, in a refrigerant circulation direction: -- a compression device 7, -- a first two-fluid exchanger 8 arranged jointly on the refrigerant circuit 6 and on the main loop 2 of the heat transfer fluid circuit 1 so as to allow heat exchange between the refrigerant and the heat transfer fluid of the main loop 2, -- a second two-fluid exchanger 9 arranged jointly on the refrigerant circuit 6 and on the main loop 2 of the heat transfer fluid circuit 1 so as to allow heat exchange between the refrigerant and the heat transfer fluid of the main loop 2, -- a first expansion device 10,-- a third two-fluid exchanger 16 arranged jointly on the refrigerant circuit 6 and on the secondary loop 3 of the heat transfer liquid circuit 1 so as to allow heat exchange between the refrigerant and the heat transfer liquid of the secondary loop 3, , the first branch 4 of the heat transfer liquid circuit 1 connects a first connection point 41 arranged on the main loop 2 to a second connection point 42 arranged on the main loop 2, the first branch 4 being configured so that the heat transfer liquid at the outlet of the first dual-fluid exchanger 8 returns to an inlet 8a of the first dual-fluid exchanger 8 without passing through the second dual-fluid exchanger 9, the first branch 4 comprising a second heat exchanger 12 configured to exchange heat with a second air flow F2, and the second branch 5 of the heat transfer liquid circuit 1 connects a third connection point 43 arranged on the first branch 4 downstream of the second heat exchanger 12 to a fourth connection point 44 arranged on the main loop 2 upstream of the second dual-fluid exchanger 9, the second branch 5 comprising a third heat exchanger 13 configured to exchange heat with the second air flow F2.The main loop 2 of the heat transfer fluid circuit 1 comprises a first heat exchanger 11 configured to exchange heat with a first air flow F1.

[0088] In the illustrated example, the thermal conditioning system 100 is a thermal conditioning system of a motor vehicle. The first air flow F1 is an air flow inside a passenger compartment of a motor vehicle. The second air flow F2 is an air flow outside a passenger compartment of the vehicle.

[0089] Interior airflow refers to an airflow directed towards the passenger compartment of the motor vehicle. This interior airflow may circulate in a heating, ventilation and air conditioning system, often referred to by the English term "HVAC" meaning "Heating, Ventilating and Air Conditioning". This system has not been shown in the various figures.

[0090] An outside air flow is defined as an air flow that is not directed into the vehicle interior. In other words, this air flow remains outside the vehicle. A motor-fan unit, not shown, can be activated to increase the flow rate of the outside air flow if necessary. Similarly, another motor-fan unit, also not shown, is arranged in the heating system to increase the flow rate of the interior air flow if necessary.

[0091] An electronic control unit, also not shown, receives information from various sensors measuring in particular the characteristics of the refrigerant fluid at various points in the circuit. The electronic unit also receives the instructions requested by the occupants of the vehicle, such as for example the desired temperature inside the passenger compartment. The instructions can also come from other electronic systems, for example the system controlling the batteries in the case of an electric vehicle. The electronic control unit implements control laws allowing the piloting of the various actuators, in order to ensure the control of the thermal conditioning system 100.

[0092] The first branch 4 of the heat transfer liquid circuit 1 is a bypass branch of the main loop 2. Similarly, the second branch 5 of the heat transfer liquid circuit 1 is a bypass branch of the first branch 4.

[0093] The third heat exchanger 13 is arranged upstream of the second heat exchanger 12 in a flow direction of the second air flow F2. Thus, the third heat exchanger 13 receives an air flow which has not undergone heat exchange with another heat exchanger.

[0094] The third two-fluid exchanger 16 is configured to be thermally coupled with a first element 25 of an electric powertrain of a motor vehicle.

[0095] The first element 25 of the electric powertrain of the vehicle is configured to exchange heat with the heat transfer fluid circulating in the secondary heat transfer fluid loop 3. The first element 25 of the electric powertrain of the vehicle comprises an electric traction motor of the vehicle. The first element 25 of the electric powertrain of the vehicle may comprise an electronic module for controlling an electric traction motor of the vehicle.

[0096] Secondary loop 3 provides thermal regulation of the battery 25 to maintain it within an optimal operating temperature range. Similarly, thermal regulation of the electronic module controlling the electric motor is provided.

[0097] The main loop 2 of the heat transfer fluid circuit 1 and the secondary loop 3 of the heat transfer fluid circuit 1 are configured to be in communication. In other words, the main loop 2 and the secondary loop 3 can be fluidically connected.

[0098] The secondary loop 3 of the heat transfer liquid circuit 1 is fluidically connected to the first branch 4 of the heat transfer liquid circuit 1. Thus, the heat transfer liquid circuit 1 comprises a third branch 18 connecting a fifth connection point 45 arranged on the first branch 4 between the first connection point 41 and the second heat exchanger 12 to a sixth connection point 46 arranged on the secondary loop 3 downstream of the first element 25.

[0099] The heat transfer fluid circuit 1 comprises a fourth branch 19 connecting a seventh connection point 47 arranged on the secondary loop 3 upstream of the first element 25 to an eighth connection point 48 arranged on the first branch 4 between the third connection point 43 and the second connection point 42. The third branch 18 is a bypass branch. The fourth branch 19 is a bypass branch. The third branch 18 and the fourth branch 19 provide fluid communication between the main loop 2 and the secondary loop 3.

[0100] As shown in the figure 1, the refrigerant circuit 6 comprises a first bypass branch B connecting a first connection point 31 arranged on the main loop A downstream of the second dual-fluid exchanger 9 and upstream of the third dual-fluid exchanger 16 to a second connection point 32 arranged on the main loop A downstream of the third dual-fluid exchanger 16 and upstream of the compression device 7, the first bypass branch B comprising a fourth dual-fluid exchanger 20 configured to be thermally coupled with a second element 26 of an electric powertrain of the vehicle.

[0101] The fourth two-fluid exchanger 20 is configured to exchange heat with a heat transfer fluid circulating in an auxiliary loop 17. The second element 26 of the electric powertrain is arranged on the auxiliary loop 17 of heat transfer fluid. The second element 26 of the electric powertrain of the vehicle is configured to exchange heat with the heat transfer fluid of the auxiliary loop 17. The second element 26 of the electric powertrain of the vehicle is here an electrical energy storage battery. The battery 26 can provide the energy necessary for the traction of the vehicle. The auxiliary loop 17 is isolated from the rest of the heat transfer fluid circuit 1.

[0102] The first branch branch B comprises a second expansion device 22 arranged upstream of the fourth dual-fluid exchanger 20. The refrigerant fluid expanded by the second expansion device 22 can thus evaporate in the fourth dual-fluid exchanger 20 and thus absorb heat from the second element 26 of the electric powertrain of the vehicle in order to cool it.

[0103] The first connection point 31 is arranged on the main loop A of the refrigerant circuit 6 upstream of the first expansion device 10.

[0104] The main loop A of the refrigerant circuit 6 comprises a refrigerant accumulation device 21 arranged downstream of the third two-fluid exchanger 16 and upstream of the compression device 7.

[0105] In the example shown, the main loop A of the refrigerant circuit 6 comprises a refrigerant accumulation device 21 arranged downstream of the third two-fluid exchanger 16 and upstream of the second connection point 32. In other words, the refrigerant circulating in the first bypass branch B returns to the main loop A downstream of the accumulator 21, and therefore does not pass into the accumulator 21.

[0106] According to a variant not shown, the main loop A of the refrigerant circuit 6 comprises a refrigerant accumulation device 21 arranged downstream of the second connection point 32 and upstream of the compression device 7. In this case, the refrigerant circulating in the first bypass branch B returns to the main loop A upstream of the accumulator 21, and therefore passes through the accumulator 21.

[0107] According to a second embodiment, illustrated in the figure 2, the refrigerant circuit 6 also comprises a second bypass branch C connecting a third connection point 33 arranged on the main loop A downstream of the second dual-fluid exchanger 9 and upstream of the first connection point 31 to a fourth connection point 34 arranged on the main loop A downstream of the third dual-fluid exchanger 16 and upstream of the second connection point 32, the second bypass branch C successively comprising a third expansion device 23 and a fourth heat exchanger 14 configured to exchange heat with the first air flow F1. In other words, the refrigerant circuit 6 of the second embodiment comprises an additional bypass branch compared to the first embodiment.

[0108] The fourth heat exchanger 14 is arranged upstream of the third heat exchanger 13 in a flow direction of the first air flow F1. The fourth heat exchanger 14 and the third heat exchanger 13 are here arranged in the heating, ventilation and air conditioning system of the vehicle.

[0109] According to a third embodiment, illustrated in particular on the Figure 5, the refrigerant circuit 6 also comprises a third bypass branch D connecting a fifth connection point 35 arranged on the main loop A downstream of the compression device 7 and upstream of the second two-fluid exchanger 9 to a sixth connection point 36 arranged on the main loop A downstream of the fifth connection point 35, the third bypass branch D comprising a fifth heat exchanger 15 configured to exchange heat with the second air flow F2. The fifth heat exchanger 15 is arranged downstream of the second heat exchanger 12 in a flow direction of the second air flow F2.

[0110] In the embodiment of the Figure 5, the refrigerant circuit 6 also comprises a fourth bypass branch E connecting a seventh connection point 37 arranged on the main loop A downstream of the fourth connection point 34 and upstream of the compression device 7 to an eighth connection point 38 arranged on the third bypass branch D downstream of the fifth connection point 35 and upstream of the fifth heat exchanger 15.

[0111] The refrigerant circuit 6 also comprises a fifth bypass branch F connecting a ninth connection point 39 arranged on the main loop A downstream of the third connection point 33 and upstream of the third two-fluid exchanger 16 to a tenth connection point 40 arranged on the third bypass branch D downstream of the fifth heat exchanger 15 and upstream of the sixth connection point 36, and the fifth bypass branch F comprises a fourth expansion device 24.

[0112] In order to simplify the illustrative figures, the fourth connection point 34 is shown merged with the seventh connection point 37. Similarly, the ninth connection point 39 is shown merged with the first connection point 31. These connection points can of course be distinct, that is to say offset along a portion of the circuit.

[0113] According to an alternative embodiment, illustrated in the figure 3, the main loop A of the refrigerant circuit 6 comprises a sixth heat exchanger 76 arranged upstream of the first expansion device 10, the sixth heat exchanger 76 being configured to exchange heat with the first air flow F1. The sixth heat exchanger 76 allowing direct heat exchange with the first air flow F1, the first air flow F1 can be heated more quickly than when the heating is provided by the first heat exchanger 11.

[0114] On the method of realization of the figure 3 , the sixth heat exchanger 76 is arranged upstream of the first two-fluid exchanger 8 in the direction of travel of the refrigerant fluid. For reasons of clarity of the figure 3, the air flow F1 is represented in the form of two separate arrows F1. It is understood that these two arrows here relate to the same air flow. The sixth heat exchanger 76 is arranged downstream of the fourth heat exchanger 14, according to the direction of flow of the air flow F1.

[0115] According to the embodiment illustrated on the figure 4, the refrigerant circuit 6 comprises a sixth bypass branch G connecting an eleventh connection point 59 arranged on the main loop A upstream of the first dual-fluid exchanger 8 to a twelfth connection point 60 arranged on the main loop A downstream of the second dual-fluid exchanger 9, and in which the sixth bypass branch G comprises a sixth heat exchanger 76 configured to exchange heat with the first air flow F1. The twelfth connection point 60 is upstream of the first expansion device 10. In other words, the sixth bypass branch G is a bypass branch of the first dual-fluid exchanger 8 and of the second dual-fluid exchanger 9.

[0116] The sixth heat exchanger 76 is in this variant added to the structure of the second embodiment. The sixth heat exchanger 76 can also be added to the structure of the refrigerant circuit 6 of the first embodiment, as well as to that of the third embodiment. These two variants have not been shown.

[0117] The refrigerant circuit 6 comprises several shut-off valves for prohibiting or authorizing the circulation of refrigerant in various portions of the circuit 6.

[0118] Thus, the main loop A of the refrigerant circuit 6 comprises a first stop valve 51 arranged between the fifth connection point 35 and the sixth connection point 36. The third bypass branch D comprises a second stop valve 52 arranged between the fifth connection point 35 and the eighth connection point 38. The fourth bypass branch E comprises a third stop valve 53.

[0119] Each of the stop valves 51, 52, 53 is configured to selectively block or allow the circulation of the refrigerant in the circulation branch on which the stop valve is arranged. Thus, the second stop valve 52 is configured to selectively allow or prohibit the passage of the refrigerant in the third bypass branch D. The third stop valve 53 is configured to selectively allow or prohibit the passage of the refrigerant in the fourth bypass branch E.

[0120] The third bypass branch D comprises a first non-return valve 55 configured to block a circulation of the refrigerant fluid from the sixth connection point 36 to the tenth connection point 40. The fifth bypass branch F comprises a second non-return valve 56 configured to block a circulation of the refrigerant fluid from the tenth connection point 40 to the ninth connection point 39.

[0121] The heat transfer fluid circuit 1 comprises several pumps for circulating the heat transfer fluid in various portions of the circuit 1.

[0122] Thus, the main heat transfer liquid loop 2 comprises a first heat transfer liquid circulation pump 71. The first heat transfer liquid circulation pump 71 is arranged between the first connection point 41 and the second connection point 42. The first circulation pump 71 is configured to circulate the heat transfer liquid from the first two-fluid exchanger 8 to the first connection point 41. The sign 71a designates the inlet of the first pump 71, and the sign 71b designates the outlet of the first pump 71.

[0123] The secondary heat transfer liquid loop 3 comprises a second heat transfer liquid circulation pump 72. The second heat transfer liquid circulation pump 72 is arranged on the secondary loop 3 between the seventh connection point 47 and the sixth connection point 46. The second heat transfer liquid circulation pump 72 is configured to circulate the heat transfer liquid from the seventh connection point 47 to the sixth connection point 46. The sign 72a designates the inlet of the second pump 72, and the sign 72b designates the outlet of the second pump 72.

[0124] In the embodiments described, the connection between the different branches or loops of the heat transfer liquid circuit 1 involves three-way valves. This means valves in which a movable shutter makes it possible to connect one inlet / outlet channel with one or other of the two other inlet / outlet channels, or to connect the three inlet / outlet channels.

[0125] The main heat transfer liquid circulation loop 2 comprises a first three-way valve 57 arranged jointly on the main loop 2 and on the first branch 4. In the example illustrated, the first connection point 41 is here part of the first three-way valve 57. A first way 57a and a second way 57b of the first three-way valve 57 are arranged on the main loop 2. A third way 57c of the first three-way valve 57 is arranged on the first branch 4. The first three-way valve 57 makes it possible to connect the main heat transfer liquid circulation loop 2 and the first branch 4.

[0126] The secondary loop 3 for circulating heat transfer liquid comprises a second three-way valve 58 arranged jointly on the secondary loop 3 and on the third branch 18. The sixth connection point 46 is here part of the second three-way valve 58. A first way 58a and a second way 58b of the second three-way valve 58 are arranged on the secondary loop 3. A third way 58c of the second three-way valve 58 is arranged on the third branch 18. The second three-way valve 58 makes it possible to put the secondary loop 3 and the first branch 4 into communication, via the third branch 18 which ensures a fluid connection between the two.

[0127] According to a variant not shown, the third way 58c of the second three-way valve 58 is directly connected to the first branch 4. The third branch 18 is then not present. In other words, the fifth connection point 45 and the sixth connection point 46 are then merged, and are part of the second three-way valve 58.

[0128] Similarly, according to a variant not shown, the fourth branch 19 is not present. In this case, the seventh connection point 47 and the eighth connection point 48 are merged. The secondary loop 3 and the first branch 4 are connected directly.

[0129] According to embodiments illustrated in particular on the figure 1 and the figure 7 , the thermal conditioning system 100 comprises a casing 50 defining a receiving volume, and the main loop A of the refrigerant circuit 6 is contained inside the casing 50.

[0130] The casing 50 defines a closed receiving volume in which the refrigerant circuit 6 is contained. The casing 50 defines a volume sealed against the refrigerant.

[0131] The first bypass branch B of the refrigerant circuit 6 is contained inside the casing 50. In other words, in the embodiments and variants in which the refrigerant circuit 6 comprises only the main loop A and the first bypass branch B, the entire refrigerant circuit 6 is contained inside the casing 50. This is the case in the example of the figure 1 .

[0132] It is thus possible to assemble all the components of the refrigerant circuit 6 within a single module. The refrigerant circuit 6 can thus be completely assembled and tested before being delivered. The refrigerant circuit 6 can thus, at the time of delivery, already be filled and ready for operation. Vehicle assembly operations are therefore faster and simpler since part of the assembly is carried out before delivery.

[0133] According to other embodiments, in which the refrigerant circuit comprises one or more heat exchangers exchanging with the first air flow F1 or the second air flow F2, the casing 50 comprises inlets / outlets to the outside. In other words, in this case only a portion of the refrigerant circuit 6 is contained in the casing 50. This is the case in the example of the figure 7. The 50 housing allows the main components to be grouped together in a single module. Heat exchangers external to the module are easily connected to the module, depending on the desired configuration. A standard module can be used, and the various options can be connected quickly and easily. Assembly is easier and faster than when the individual elements are assembled individually. A single standard module can be used for a wide variety of different applications.

[0134] The second branch branch C of the refrigerant circuit 6 comprises a first portion C1 contained inside the casing 50, the casing 50 comprises a first refrigerant inlet / outlet 81, the first portion C1 connecting the third connection point 33 and the ninth inlet / outlet 81. The second branch branch C of the refrigerant circuit 6 comprises a second portion C2 contained inside the casing 50, and the casing 50 comprises a second refrigerant inlet / outlet 82, the second portion C2 connecting the fourth connection point 34 and the second inlet / outlet 82.

[0135] The third trigger device 23 is contained inside the housing 50.

[0136] The third branch branch D of the refrigerant circuit 6 comprises a third portion D1 contained inside the casing 50, and the casing 50 comprises a third refrigerant inlet / outlet 83, the third portion D1 connecting the fifth connection point 35 and the third inlet / outlet 83. The third branch branch D of the refrigerant circuit 6 comprises a fourth portion D2 contained inside the casing 50, and the casing 50 comprises a fourth refrigerant inlet / outlet 84, the fourth portion D2 connecting the sixth connection point 36 and the fourth inlet / outlet 84.

[0137] The fourth bypass branch E is contained within the housing 50. The fifth bypass branch F is contained within the housing 50. The first shut-off valve 51, the second shut-off valve 52 and the third shut-off valve 53 are contained within the housing 50. The first check valve 55 and the second check valve 56 are contained within the housing 50. The compression device 7 is contained within the housing 50.

[0138] The heat transfer fluid circuit 1 can also be partly contained in the aforementioned module.

[0139] Thus, the main loop 2 of the heat transfer liquid circuit 1 comprises a fifth portion 65 contained inside the casing 50, the casing 50 comprises a fifth heat transfer liquid inlet / outlet 85 and a sixth heat transfer liquid inlet / outlet 86, the fifth portion 65 connecting the fifth inlet / outlet 85 and the sixth inlet / outlet 86, and the first two-fluid exchanger 8 and the second two-fluid exchanger 9 are arranged on the fifth portion 65. It is understood that the element designated by the term inlet / outlet can be, depending on the operating conditions, either an inlet of heat transfer liquid into the casing 50, or an outlet of heat transfer liquid to the outside of the casing 50.

[0140] The first branch 4 of the heat transfer liquid circuit 1 comprises a sixth portion 66 contained inside the casing 50, the casing 50 comprises a seventh heat transfer liquid inlet / outlet 87, the sixth portion 66 connecting the seventh inlet / outlet 87 and the second connection point 42.

[0141] The second branch 5 heat transfer liquid circuit 1 comprises a seventh portion 67 contained inside the casing 50, the receiving casing 1 comprises an eighth heat transfer liquid inlet / outlet 88, and the seventh portion 67 connects the eighth inlet / outlet 88 and the fourth connection point 44.

[0142] The secondary loop 3 heat transfer liquid circuit 1 comprises an eighth portion 68 contained inside the casing 50, the casing 50 comprises a ninth heat transfer liquid inlet / outlet 89 and a tenth heat transfer liquid inlet / outlet 90, the eighth portion 68 connects the ninth inlet / outlet 89 and the tenth inlet / outlet 90, and the third two-fluid exchanger 16 is arranged on the eighth portion 68.

[0143] The main loop 2 of the heat transfer liquid circuit 1 comprises a ninth portion 69 contained inside the casing 50, the casing 50 comprises an eleventh heat transfer liquid inlet / outlet 91 and a twelfth heat transfer liquid inlet / outlet 92, the ninth portion 69 connecting the eleventh inlet / outlet 91 and the twelfth inlet / outlet 92.

[0144] The first heat transfer liquid circulation pump 71 is contained inside the casing 50. The second connection point 42 is arranged inside the casing 50.

[0145] The main loop 2 of the heat transfer fluid circuit 1 comprises an electric heating device 27 configured to heat the heat transfer fluid. The electric heating device 27 supplements the heating of the heat transfer fluid supplied by the first dual-fluid exchanger 8 and the second dual-fluid exchanger 9. Activation of the electric heating 27 makes it possible in particular to reduce the response time of the thermal conditioning system.

[0146] According to an exemplary embodiment not shown, the electric heating device 27 is arranged outside the casing 50.

[0147] On the examples shown on the figure 1 and on the figure 6 , the electric heating device 27 is contained inside the housing 50. The electric heating device 27 is arranged on the ninth portion 69.

[0148] The auxiliary loop 17 of the heat transfer liquid circuit 1 comprises a tenth portion 70 contained inside the casing 50, the casing 50 comprises a thirteenth heat transfer liquid inlet / outlet 93 and a fourteenth heat transfer liquid inlet / outlet 94, the tenth portion 70a connecting the thirteenth inlet / outlet 91 and the fourteenth inlet / outlet 94, and the fourth two-fluid exchanger 20 is arranged on the tenth portion 70

[0149] Each inlet / outlet arranged on the heat transfer fluid circuit 1 allows the connection of a portion of the circuit contained inside the casing 50 with a portion of the circuit arranged outside the casing 50. Various types of connection can be used. The connections have not been shown in detail in the figures. Similarly, each inlet / outlet arranged on the refrigerant circuit 6 allows the connection of a portion of the circuit contained inside the casing 50 with a portion of the circuit arranged outside the casing 50.

[0150] According to the variant of the third embodiment illustrated in the figure 6, the main loop A comprises an internal heat exchanger 28, the internal heat exchanger 28 comprising a first heat exchange section 29 arranged downstream of the second two-fluid exchanger 9 and upstream of the first connection point 31 and a second heat exchange section 30 arranged downstream of the refrigerant fluid accumulation device 21 and upstream of the compression device 7, the internal heat exchanger 28 being configured to allow heat exchange between the refrigerant fluid in the first heat exchange section 29 and the refrigerant fluid in the second heat exchange section 30.

[0151] According to the fourth embodiment, the internal heat exchanger 28 is arranged inside the casing 50.

[0152] The casing 50 has been shown in the context of the first embodiment, on the figure 1 , as well as in the context of the fourth embodiment, on the figure 6. The casing 50 can also be used for the other embodiments and variants described in the figures 2 , 3, and 4 .

[0153] The thermal conditioning system 100 described above can operate in many operating modes, i.e., implement many different operating methods. Some of these will be described below, and illustrated in the figures 7 to 9 . In these figures, the portions of the circuit in which refrigerant or heat transfer fluid circulate are shown in thick lines. The portions in which the refrigerant does not circulate are shown in dotted lines. Similarly, the portions in which the heat transfer fluid does not circulate are also shown in dotted lines.

[0154] According to a method of operating a thermal conditioning system as described previously, in a so-called cooling mode, shown diagrammatically on the figure 8 : - the refrigerant fluid circulates in the compression device 7 where it passes at high pressure, and circulates successively in the fifth heat exchanger 15 where it gives off heat to the second air flow F2, in the first two-fluid exchanger 8, in the second two-fluid exchanger 9, in the third expansion device 23 where it passes at low pressure, in the fourth heat exchanger 14 where it absorbs heat from the first air flow F1, the low-pressure refrigerant fluid returning to the compression device 7, - the heat transfer liquid circulates successively in the second two-fluid exchanger 9, in the first two-fluid exchanger 8, in the second heat exchanger 12 where it gives off heat to the second air flow F2, is divided into a first flow circulating in the first branch 4 and a second flow circulating in the second branch 5, the first flow joining the main loop 2 upstream of the first two-fluid exchanger 8 and the second flow joining the main loop 2 upstream of the second two-fluid exchanger 9.

[0155] In this operating mode, the fifth heat exchanger 15 operates as a condenser, and dissipates the heat of the high-pressure, high-temperature refrigerant fluid at the outlet of the compressor 7 into the second air flow F2. Depending on the operating conditions, the first two-fluid exchanger 8 completes the condensation or ensures subcooling of the refrigerant fluid. The second two-fluid exchanger 9, which is coupled with the third heat exchanger 13 receiving the first, coolest air flow F1, ensures subcooling of the refrigerant fluid. The expansion in the third expansion device 23 of the subcooled refrigerant fluid thus ensures particularly effective cooling of the first air flow F1 which passes through the fourth heat exchanger 14. When it is present, the internal heat exchanger 28 further increases the heat exchange carried out and therefore the cooling of the first air flow F1.The heat transfer fluid having passed through the first dual-fluid exchanger 8 passes through the second heat exchanger 12 and dissipates heat in the second air flow F2. A portion of the heat transfer fluid flow leaving the second heat exchanger 12 remains in the first branch 4 and joins the main loop 2 between the two dual-fluid exchangers 8, 9 at the second connection point 42. The complementary portion of the heat transfer fluid flow takes the second branch 5, passes through the third heat exchanger 13 and returns to the main loop 2 upstream of the second dual-fluid exchanger 9. The second dual-fluid exchanger 9 therefore receives heat transfer fluid at a lower temperature than that of the heat transfer fluid received by the first dual-fluid exchanger 8.According to the embodiment shown, the distribution at the third connection point 43 between the flow remaining in the first branch 4 and the flow passing through the second branch 5 is made according to the relative pressure losses of the first branch between the third connection point 43 and the second connection point 42, and of the circuit portion comprising the second branch 5 between points 43 and 44 as well as the portion of main loop 2 between point 44 and point 42. In practice, the flow in the first branch 4 is greater than the flow in the second branch 5. The second dual-fluid exchanger 9 thus receives low-temperature heat transfer fluid, which makes it possible to ensure very effective subcooling of the refrigerant. The cooling capacity of the first air flow F1 is thus maximized.

[0156] On the refrigerant circuit 6, the first stop valve 51 and the third stop valve 53 are closed, the second stop valve 52 is open. The first expansion valve 10, the second expansion valve 22 and the fourth expansion valve 24 are in the closed position and prevent the passage of the refrigerant. On the heat transfer liquid circuit 1, the three-way valve 57 directs the heat transfer liquid leaving the pump 71 towards the first branch 4, and prevents the circulation of the heat transfer liquid towards the first heat exchanger 11.

[0157] According to a method of operating a thermal conditioning system as described previously, in a so-called heating mode, shown diagrammatically on the figure 9 : - the refrigerant circulates in the compression device 7 where it passes at high pressure, and circulates successively in the first two-fluid exchanger 8 where it gives off heat to the heat transfer liquid, in the second two-fluid exchanger 9 where it gives off heat to the heat transfer liquid, in the fourth expansion device 24 where it passes at low pressure, in the fifth heat exchanger 15 where it absorbs heat from the second air flow F2, the low-pressure refrigerant returning to the compression device 7, - the heat transfer liquid circulates successively in the second two-fluid exchanger 9 where it receives heat from the refrigerant, in the first two-fluid exchanger 8 where it receives heat from the refrigerant, in the first heat exchanger 11 where it gives off heat to the first air flow F1.

[0158] In this operating mode, the first two-fluid exchanger 8 operates as a condenser, and dissipates the heat of the high-pressure, high-temperature refrigerant into the heat transfer fluid of the main loop 2. The second two-fluid exchanger 9 completes the condensation and also dissipates heat into the heat transfer fluid. The heat transfer fluid circulates in the first heat exchanger 11, which thus heats the first air flow F1. The additional heating device 27 can be activated to increase the temperature of the heat transfer fluid. The three-way valve 57 prevents the circulation of refrigerant fluid in the first branch 4, and therefore a fortiori in the second branch 5. The expansion of the refrigerant fluid in the fourth expansion device 24 causes the refrigerant liquid to pass at low pressure, and this evaporates while passing through the fifth heat exchanger 15, taking heat from the second air flow F2.The low-pressure refrigerant then flows through the fourth bypass branch E and joins the main loop A upstream of the accumulation device 21. To enable this mode of circulation of the refrigerant, the second stop valve 52 is closed. The first stop valve 51 and the third stop valve 53 are open.

[0159] According to a method of operating a thermal conditioning system as described previously, in a so-called parallel dehumidification mode, shown diagrammatically in the figure 10 : - the refrigerant circulates in the compression device 7 where it passes at high pressure, and circulates successively in the first two-fluid exchanger 8 where it gives off heat to the heat transfer liquid, in the second two-fluid exchanger 9 where it gives off heat to the heat transfer liquid, is divided between a first flow rate and a second flow rate, the first flow rate circulating in the fourth expansion device 24 where it passes at low pressure, in the fifth heat exchanger 15 where it absorbs heat from the second air flow F2, the second flow rate circulating in the third expansion device 23 where it passes at low pressure, in the fourth heat exchanger 14 where it absorbs heat from the first air flow F1, the first flow rate of refrigerant at low pressure and the second flow rate of refrigerant at low pressure joining before joining the compression device 7,- the heat transfer fluid circulates successively in the second two-fluid exchanger 9 where it receives heat from the refrigerant, in the first two-fluid exchanger 8 where it receives heat from the refrigerant, in the first heat exchanger 11 where it gives off heat to the first air flow F1.,

[0160] This operating mode differs from the previous one in that a portion of the refrigerant flow leaving the second two-fluid exchanger 9 circulates in the second bypass branch C and passes through the fourth heat exchanger 14 after having been expanded in the third expansion device 23. The first air flow F1 is therefore cooled by passing through the fourth heat exchanger 14, and is reheated by then passing through the first heat exchanger 11. The first air flow F1 is thus dehumidified. The distribution between the refrigerant flow passing through the fifth heat exchanger 15 and the refrigerant flow passing through the fourth heat exchanger 14 is done in the position of the effective section of the fourth expansion valve 24 and the third expansion valve 23.

[0161] Many other operating modes are possible. In particular, a degree of opening of the first expansion device 10, associated with a circulation of heat transfer liquid in the secondary loop 3, makes it possible to ensure cooling of the first element 25. Similarly, a degree of opening of the second expansion device 22 makes it possible to ensure cooling of the second element 26.

Claims

1. Thermal conditioning system (100) comprising: - a heat-transfer liquid circuit (1) having: a main circulation loop (2), a secondary loop (3), a first branch (4) and a second branch (5), - a refrigerant fluid circuit (6) comprising a main loop (A) for circulation of refrigerant fluid having the following in succession in a direction of circulation of the refrigerant fluid: -- a compression device (7), -- a first bifluid exchanger (8) arranged both on the refrigerant fluid circuit (6) and on the main loop (2) of the heat-transfer liquid circuit (1) so as to enable an exchange of heat between the refrigerant fluid and the heat-transfer liquid in the main loop (2), -- a second bifluid exchanger (9) arranged both on the refrigerant fluid circuit (6) and on the main loop (2) of the heat-transfer liquid circuit (1) so as to enable an exchange of heat between the refrigerant fluid and the heat-transfer liquid in the main loop (2), -- a first expansion device (10), -- a third bifluid exchanger (16) arranged both on the refrigerant fluid circuit (6) and on the secondary loop (3) of the heat-transfer liquid circuit (1) so as to enable an exchange of heat between the refrigerant fluid and the heat-transfer liquid in the secondary loop (3), wherein the first branch (4) of the heat-transfer liquid circuit (1) links a first connection point (41) disposed on the main loop (2) to a second connection point (42) disposed on the main loop (2), the first branch (4) being configured such that the heat-transfer liquid at the outlet of the first bifluid exchanger (8) returns to an inlet (8a) of the first bifluid exchanger (8) without passing through the second bifluid exchanger (9), the first branch (4) having a second heat exchanger (12) configured to exchange heat with a second air stream (F2), and wherein the second branch (5) of the heat-transfer liquid circuit (1) links a third connection point (43) disposed on the first branch (4) downstream of the second heat exchanger (12) to a fourth connection point (44) disposed on the main loop (2) upstream of the second bifluid exchanger (9), the second branch (5) having a third heat exchanger (13) configured to exchange heat with the second air stream (F2).

2. Thermal conditioning system according to Claim 1, wherein the main loop (2) of the heat-transfer liquid circuit (1) has a first heat exchanger (11) configured to exchange heat with a first air stream (F1).

3. Thermal conditioning system according to Claim 2, wherein the first air stream (F1) is an air stream internal to an interior of a motor vehicle, and wherein the second air stream (F2) is an air stream external to an interior of the vehicle.

4. Thermal conditioning system according to one of the preceding claims, wherein the third heat exchanger (13) is disposed upstream of the second heat exchanger (12) in a direction of flow of the second air stream (F2).

5. Thermal conditioning system according to one of the preceding claims, wherein the third bifluid exchanger (16) is configured to be thermally coupled to a first element (25) of an electric powertrain of a motor vehicle.

6. Thermal conditioning system according to one of the preceding claims, wherein the refrigerant fluid circuit (6) has a first bypass branch (B) linking a first junction point (31) disposed on the main loop (A) downstream of the second bifluid exchanger (9) and upstream of the third bifluid exchanger (16) to a second junction point (32) disposed on the main loop (A) downstream of the third bifluid exchanger (16) and upstream of the compression device (7), the first bypass branch (B) having a fourth bifluid exchanger (20) configured to be thermally coupled to a second element (26) of an electric powertrain of the vehicle.

7. Thermal conditioning system according to the preceding claim, wherein the main loop (A) of the refrigerant fluid circuit (6) has a refrigerant fluid accumulation device (21) disposed downstream of the third bifluid exchanger (16) and upstream of the second junction point (32).

8. Thermal conditioning system according to Claim 6 or 7, wherein the refrigerant fluid circuit (6) has a second bypass branch (C) linking a third junction point (33) disposed on the main loop (A) downstream of the second bifluid exchanger (9) and upstream of the first junction point (31) to a fourth junction point (34) disposed on the main loop (A) downstream of the third bifluid exchanger (16) and upstream of the second junction point (32), the second bypass branch (C) having the following in succession: a third expansion device (23) and a fourth heat exchanger (14) configured to exchange heat with the first air stream (F1).

9. Thermal conditioning system according to one of the preceding claims, wherein the refrigerant fluid circuit (6) has a third bypass branch (D) linking a fifth junction point (35) disposed on the main loop (A) downstream of the compression device (7) and upstream of the second bifluid exchanger (9) to a sixth junction point (36) disposed on the main loop (A) downstream of the fifth junction point (35), the third bypass branch (D) having a fifth heat exchanger (15) configured to exchange heat with the second air stream (F2).

10. Thermal conditioning system according to Claim 9 in combination with Claim 8, wherein the refrigerant fluid circuit (6) has a fourth bypass branch (E) linking a seventh junction point (37) disposed on the main loop (A) downstream of the fourth junction point (34) and upstream of the compression device (7) to an eighth junction point (38) disposed on the third bypass branch (D) downstream of the fifth junction point (35) and upstream of the fifth heat exchanger (15), wherein the refrigerant fluid circuit (6) has a fifth bypass branch (F) linking a ninth junction point (39) disposed on the main loop (A) downstream of the third junction point (33) and upstream of the third bifluid exchanger (16) to a tenth junction point (40) disposed on the third bypass branch (D) downstream of the fifth heat exchanger (15) and upstream of the sixth junction point (36), and wherein the fifth bypass branch (F) has a fourth expansion device (24).

11. Thermal conditioning system according to one of Claims 1 to 10, wherein the main loop (A) of the refrigerant fluid circuit (6) comprises a sixth heat exchanger (76) disposed upstream of the first expansion device (10), the sixth heat exchanger (76) being configured to exchange heat with the first air stream (F1).

12. Thermal conditioning system according to one of Claims 1 to 10, wherein the refrigerant fluid circuit (6) has a sixth bypass branch (G) linking an eleventh junction point (59) disposed on the main loop (A) upstream of the first bifluid exchanger (8) to a twelfth junction point (60) disposed on the main loop (A) downstream of the second bifluid exchanger (9), and wherein the sixth bypass branch (G) comprises a sixth heat exchanger (76) configured to exchange heat with the first air stream (F1).

13. Thermal conditioning system (100) according to one of the preceding claims in combination with Claim 6, comprising a casing (50) which defines a receiving volume, wherein the main loop (A) of the refrigerant fluid circuit (6) is inside the casing (50) and wherein the first bypass branch (B) of the refrigerant fluid circuit (6) is inside the casing (50).

14. Thermal conditioning system according to the preceding claim in combination with Claim 8, wherein the second bypass branch (C) of the refrigerant fluid circuit (6) has a first portion (C1) inside the casing (50), wherein the casing (50) has a first inlet / outlet (81) for refrigerant fluid, the first portion (C1) linking the third junction point (33) and the ninth inlet / outlet (81), and wherein the second bypass branch (C) of the refrigerant fluid circuit (6) has a second portion (C2) inside the casing (50), wherein the casing (50) has a second inlet / outlet (82) for refrigerant fluid, the second portion (C2) linking the fourth junction point (34) and the second inlet / outlet (82).

15. Thermal conditioning system according to Claim 13 or 14, wherein the main loop (2) of the heat-transfer liquid circuit (1) has a fifth portion (65) inside the casing (50), wherein the casing (50) has a fifth inlet / outlet (85) for heat-transfer liquid and a sixth inlet / outlet (86) for heat-transfer liquid, the fifth portion (65) linking the fifth inlet / outlet (85) and the sixth inlet / outlet (86), and wherein the first bifluid exchanger (8) and the second bifluid exchanger (9) are disposed on the fifth portion (65), wherein the first branch (4) of the heat-transfer liquid circuit (1) has a sixth portion (66) inside the casing (50), and wherein the casing (50) has a seventh inlet / outlet (87) for heat-transfer liquid, the sixth portion (66) linking the seventh inlet / outlet (87) and the second connection point (42).