JP2011237106A - Chemical heat storage system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten heating time until heat storage is resumed.SOLUTION: A chemical heat storage material of a reactor 15 stores heat with dehydration reaction by receiving heat supplied from an engine exhaust gas. Steam generated with the dehydration reaction is condensed by an evaporation/condensation section 30. When discharging heat stored in the chemical heat storage material, by evaporating water through heat exchange with a cooling medium in the evaporation/condensation section 30, steam for hydration reaction is supplied to a reactor 16. The chemical heat storage material is hydrated, and heat stored in the chemical heat storage material is discharged. T the start of heat storage using the reactor 16, a chemical heat storage system 10 for vehicle controls to supply from the evaporator/condenser 30 to the reactor 16 steam higher than reaction equilibrium pressure of water vapor discharged by heat storage through a heat storage ECU. The chemical heat storage material of the reactor 16 is temporarily hydrated, and the reactor 16 is self-heated using the heat stored in the chemical heat storage material.

Description

  The present invention relates to a vehicular chemical heat storage system for effectively using heat generated with traveling of a vehicle.

  Conventionally, it has a chemical heat storage reactor filled with a heat storage material, stores heat by endothermic reaction by adding a thermal fluid during heat storage, and generates a thermal fluid by reaction heat during heat dissipation, and evaporation condensation filled with solution A chemical heat pump having an evaporator, generating a thermal fluid due to condensation heat when storing heat, and generating a cold fluid due to latent heat of evaporation when radiating heat, and a pipe and a valve connecting the chemical heat storage and the evaporation condenser Containers are known (see, for example, Patent Document 1).

JP 2008-25853 A

  However, in the conventional technology as described above, when the heat storage heat source in the heat storage system for the hybrid vehicle is engine exhaust heat, the operation period of the engine is short and the stop period is long, so that the heat storage operation is intermittent. . On the other hand, during the stop period in intermittent heat storage, the reactor temperature decreases due to external heat dissipation or the like, and therefore it is necessary to raise the temperature to a temperature level at which dehydration reaction is possible in order to resume heat storage.

  Here, in the method of raising the temperature of the heat storage material by heat exchange with the exhaust heat at the initial stage of engine operation, heat resistance is present because heat exchange is performed via the partition wall between the exhaust gas flow path and the heat storage material. Further, since the temperature difference between the exhaust gas temperature and the heat storage material is reduced in the temperature raising process, the heat exchange amount is reduced and the temperature raising time is significantly increased.

  An intermittent heat storage operation is required to efficiently raise the temperature during a short engine operation time to ensure a long heat storage period. However, the temperature raising method using an external heat source such as engine exhaust has a problem that it is difficult to shorten the temperature raising time until the heat storage is restarted.

  In view of the above fact, an object of the present invention is to obtain a vehicle chemical heat storage system capable of shortening the temperature rising time until the heat storage is restarted.

  According to a first aspect of the present invention, there is provided a chemical heat storage system for a vehicle in which a dehydration reaction is performed by supplying heat from a vehicle to store heat, and a chemical heat storage material that dissipates heat by a hydration reaction is incorporated. Evaporation condensation that supplies water vapor for the hydration reaction to the reactor by condensing the water vapor released by the reaction by heat exchange with the refrigerant and evaporating water by heat exchange with the refrigerant. And a control unit that controls to supply water vapor higher than the reaction equilibrium pressure of water vapor released by heat storage from the evaporative condenser to the reactor when heat storage by the reactor is started. It consists of

  In the chemical heat storage system for a vehicle according to the first invention, the chemical heat storage material of the reactor stores heat while causing a dehydration reaction by receiving heat supply from a heat source of the vehicle. The water vapor generated by this dehydration reaction is condensed in the evaporating and condensing part. When the heat stored in the chemical heat storage material is released, water is evaporated in the evaporative condensing unit by heat exchange with the refrigerant, thereby supplying water vapor for the hydration reaction to the reactor. As a result, a hydration reaction of the chemical heat storage material occurs, and the heat stored in the chemical heat storage material is released.

  Here, in the chemical heat storage system for vehicles, when heat storage by the reactor is started, the control unit supplies water vapor higher than the reaction equilibrium pressure of water vapor released by heat storage from the evaporation condenser to the reactor. Control. As a result, a hydration reaction of the chemical heat storage material of the reactor occurs temporarily, and the reactor self-heats using the heat stored in the chemical heat storage material.

  In this way, when heat storage by the reactor is started, hydration reaction of the chemical heat storage material of the reactor is controlled by supplying water vapor to the reactor that is higher than the reaction equilibrium pressure of water vapor released by heat storage. By temporarily generating the temperature and raising the temperature of the reactor by itself, it is possible to shorten the temperature raising time until the heat storage is restarted.

  According to a first aspect of the present invention, there is provided a chemical heat storage system for a vehicle that bypasses a cooler and circulates a refrigerant for condensing water vapor, bypasses a heat source, and A second refrigerant path structure that can circulate a refrigerant for supplying high water vapor and a refrigerant that exchanges heat in the evaporative condensing unit are circulated in the first refrigerant path structure and the second refrigerant path structure. A refrigerant switching unit that switches to any one of the refrigerants, wherein the control unit converts the refrigerant that is heat-exchanged in the evaporative condensing unit when starting heat storage by the reactor into the second refrigerant path structure. The refrigerant switching unit can be controlled to switch to the refrigerant having the first refrigerant path structure after switching to the refrigerant. Thereby, when heat storage is performed by the reactor, it is possible to instantaneously switch from the temporary hydration reaction to the heat storage state.

  The chemical heat storage system for a vehicle including the first refrigerant path structure and the second refrigerant path structure described above further includes a temperature detection unit that detects the temperature of the refrigerant in the second refrigerant path structure, and includes the cooler. The second refrigerant path structure bypasses the heat source and the cooler to circulate the refrigerant, and the control unit supplies water vapor higher than the reaction equilibrium pressure. When supplying to the reactor, the operation of the cooler is controlled based on the temperature of the refrigerant detected by the temperature detector so that the temperature of the refrigerant does not exceed a predetermined temperature. Can do. Thereby, it is possible to prevent the reactor from being excessively heated by the temporary hydration reaction of the chemical heat storage material of the reactor.

  According to a second aspect of the present invention, there is provided a chemical heat storage system for a vehicle, in which a dehydration reaction is performed by supplying heat from a vehicle to store heat, and a chemical heat storage material that dissipates heat by a hydration reaction is incorporated. Evaporation condensation that supplies water vapor for the hydration reaction to the reactor by condensing the water vapor released by the reaction by heat exchange with the refrigerant and evaporating water by heat exchange with the refrigerant. Part, a water vapor buffer for supplying water vapor higher than the reaction equilibrium pressure of water vapor released by heat storage to the reactor, and water vapor higher than the reaction equilibrium pressure when starting heat storage by the reactor, And a control unit that controls to supply from the water vapor buffer to the reactor.

  In the vehicle chemical heat storage system according to the second aspect of the invention, when the heat storage by the reactor is started, the control unit supplies steam from the water vapor buffer that is higher than the reaction equilibrium pressure of water vapor released by the heat storage. To control. As a result, a hydration reaction of the chemical heat storage material of the reactor occurs temporarily, and the reactor self-heats using the heat stored in the chemical heat storage material.

  As described above, when heat storage by the reactor is started, control is performed so that steam higher than the reaction equilibrium pressure of steam released by heat storage is supplied from the steam buffer to the reactor, and the chemical heat storage material of the reactor is controlled. By temporarily causing the hydration reaction and causing the reactor to self-heat, the temperature raising time until the heat storage is restarted can be shortened.

  The chemical heat storage system for a vehicle according to the second aspect of the invention can further include a refrigerant path structure that can circulate a refrigerant for condensing water vapor, bypassing the cooler.

  According to a second aspect of the present invention, there is provided a vehicular chemical heat storage system capable of circulating a refrigerant for condensing water vapor, bypassing the cooler and a temperature detecting unit for detecting the temperature of water vapor supplied from the evaporative condenser. A first refrigerant path structure, a second refrigerant path structure capable of circulating a refrigerant for bypassing a heat source and supplying water vapor higher than the reaction equilibrium pressure, and a refrigerant heat-exchanged in the evaporative condensing unit A refrigerant switching unit that switches to one of the refrigerant circulating in the first refrigerant path structure and the second refrigerant path structure, and the control unit starts heat storage by the reactor, Control is performed so that water vapor higher than the reaction equilibrium pressure is supplied from the water vapor buffer to the reactor, and the heat exchanged in the evaporating and condensing part is performed as the refrigerant having the second refrigerant path structure. The refrigerant switching unit is controlled to switch, and when the temperature of the water vapor detected by the temperature detection unit is a temperature at which the saturated vapor pressure is equal to or higher than the reaction equilibrium pressure, water vapor is supplied from the evaporative condenser to the reactor. Then, the refrigerant switching unit can be controlled to switch the refrigerant exchanged in the evaporative condensing unit to the refrigerant having the first refrigerant path structure. As a result, the water vapor buffer can be reduced in size.

  The water vapor buffer may supply the water vapor by heat exchange with the refrigerant having the second refrigerant path structure.

  The vehicular chemical heat storage system according to the second aspect of the present invention further includes a second temperature detection unit that detects the temperature of water vapor supplied from the water vapor buffer, and the water vapor buffer includes the water vapor together with the reactor. The controller is configured to be able to supply to the evaporative condenser, and the controller detects the temperature detected by the second temperature detector when the steam is supplied from the steam buffer to the reactor. When the temperature is equal to or higher than a predetermined temperature at which the saturated vapor pressure is higher than the equilibrium pressure, it is possible to control to supply a part of the water vapor supplied from the water vapor buffer to the evaporative condenser. Thereby, it is possible to prevent the reactor from being excessively heated by the temporary hydration reaction of the chemical heat storage material of the reactor.

  As described above, the vehicle chemical heat storage system according to the present invention controls to supply steam higher than the reaction equilibrium pressure of steam released by heat storage to the reactor when heat storage by the reactor is started. It has an excellent effect that the hydration reaction of the chemical heat storage material in the reactor is temporarily generated and the temperature rise time until the heat storage is restarted can be shortened by self-heating the reactor. .

1 is a system configuration diagram showing a schematic overall configuration of a chemical heat storage system for a vehicle according to a first embodiment of the present invention. 1 is a block diagram showing a heat storage ECU constituting a vehicle chemical heat storage system according to a first embodiment of the present invention. (A) The figure for demonstrating the thermal storage operation | movement of the chemical thermal storage system for vehicles which concerns on the 1st Embodiment of this invention, (B) The figure for demonstrating the thermal radiation operation | movement. It is a figure for demonstrating temperature rising of the reactor by the temporary hydration reaction of the chemical thermal storage system for vehicles which concerns on the 1st Embodiment of this invention. (A) The figure for demonstrating temperature rising of the reactor by heat exchange with engine exhaust heat, (B) The figure for demonstrating temperature rising of the reactor by temporary hydration reaction. It is a flowchart which shows the content of the thermal storage mode transition control processing routine by thermal storage ECU which comprises the chemical thermal storage system for vehicles which concerns on the 1st Embodiment of this invention. It is a system configuration figure showing a situation at the time of heat storage mode start of a chemical heat storage system for vehicles concerning a 1st embodiment of the present invention. It is a system configuration figure showing a situation of heat storage mode of a chemical heat storage system for vehicles concerning a 1st embodiment of the present invention. It is a system block diagram which shows the schematic whole structure of the chemical thermal storage system for vehicles which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the content of the thermal storage mode transition control processing routine by thermal storage ECU which comprises the chemical thermal storage system for vehicles which concerns on the 2nd Embodiment of this invention. It is a system block diagram which shows the schematic whole structure of the chemical heat storage system for vehicles which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the content of the thermal storage mode transition control processing routine by thermal storage ECU which comprises the chemical thermal storage system for vehicles which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the content of the thermal storage mode transition control processing routine by thermal storage ECU which comprises the chemical thermal storage system for vehicles which concerns on the 4th Embodiment of this invention. It is a system block diagram which shows the schematic whole structure of the chemical heat storage system for vehicles which concerns on the 5th Embodiment of this invention. It is a flowchart which shows the content of the thermal storage mode transition control processing routine by thermal storage ECU which comprises the chemical thermal storage system for vehicles which concerns on the 5th Embodiment of this invention.

  A vehicular chemical heat storage system 10 according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic system configuration diagram showing a schematic overall configuration of a vehicular chemical heat storage system 10. As shown in this figure, the vehicular chemical heat storage system 10 includes a reactor 16 in which a chemical heat storage material (not shown) is filled in a reaction channel 14 as a space for a chemical heat storage material in a container 12. . The chemical heat storage material constituting the reactor 16 stores heat (absorbs heat) with dehydration and dissipates heat (heat generation) with hydration (restoration to calcium hydroxide).

In this embodiment, calcium hydroxide (Ca (OH) ₂ ), which is one of alkaline earth metal hydroxides, is employed as the chemical heat storage material. Therefore, in the reactor 16, it is set as the structure which can reversibly repeat heat storage and heat dissipation by the reaction shown below.

Ca (OH) ₂ Ｃａ CaO + H ₂ O

When the heat storage amount and the heat generation amount Q are shown together in this equation,
Ca (OH) ₂ + Q → CaO + H ₂ O
CaO + H ₂ O → Ca (OH) ₂ + Q
It becomes. The heat storage capacity per kg of this chemical heat storage material (Ca (OH) ₂ ) is about 1.86 [MJ / kg-Ca (OH) ₂ ].

  Furthermore, in this embodiment, in the container 12 of the reactor 16, the air flow path 18 for supplying heat to a chemical heat storage material, and the refrigerant flow path for transporting the heat from a chemical heat storage material to a heating object. (Not shown). The air flow path 18 and the refrigerant flow path are provided adjacent to the reaction flow path 14 (not shown) so that heat can be exchanged between the heat medium and the refrigerant flowing inside, and the chemical heat storage material in the reaction flow path 14. It has been.

  A heat medium line 22 is connected to the air flow path 18. An upstream side of the air flow path 18 in the heat medium line 22 is connected to a heat source of an automobile to which the vehicle chemical heat storage system 10 is applied. The downstream end 22 </ b> A of the heat medium line 22 is an atmosphere open end.

  In this embodiment, exhaust gas of the internal combustion engine EG is employed as the heat medium. In addition, you may employ | adopt the air heated with the electric heater as a heat medium. The electric heater is employed, for example, when an automobile to which the vehicle chemical heat storage system 10 is applied is an electric vehicle or a hybrid vehicle having an electric motor as a drive source, and is operated by surplus power that cannot charge the battery. be able to. Examples of the surplus power include an amount corresponding to regenerative energy associated with vehicle deceleration, and an amount corresponding to an excess power generation amount associated with load fluctuation in a configuration in which a power generation device such as a fuel cell is mounted.

  On the other hand, a heat transport line (not shown) is connected to the refrigerant flow path. A blower (not shown) is provided on the upstream side of the refrigerant flow path in the heat transport line, and an object to be heated (not shown) by the vehicle chemical heat storage system 10 is provided on the downstream side of the refrigerant flow path in the heat transport line. The heat exchange part is provided. Thereby, in the chemical heat storage system 10 for vehicles, it is set as the structure which can use for the heating (warming-up) of the heating object the heat which the chemical heat storage material radiated in the reactor 16. The downstream end of the heat transport line is an open end to the atmosphere. Examples of the heating target include an internal combustion engine EG, an exhaust catalyst for purifying exhaust gas of the internal combustion engine EG, and a battery for controlling a battery for driving a motor. It is good also as a structure which selects the heating target of a part.

  The vehicular chemical heat storage system 10 functions as a condensing unit that condenses the water vapor introduced from the reaction flow path 14 of the reactor 16 and an evaporating unit that generates water vapor by evaporating the water and supplying the water to the reactor 16. The evaporator / condenser 30 is also provided. The evaporator / condenser 30 condenses the steam channel 34 communicated with the reaction channel 14 of the reactor 16 via the steam circulation line 32, the steam in the steam channel 34, and A medium flow path 38 for evaporating water is formed in the container 40. The medium flow path 38 is provided adjacent to the vapor flow path 34 (not shown) so that heat can be exchanged between the refrigerant flowing inside and the heat medium and water or water vapor in the vapor flow path 34.

  The steam channel 34 is vacuum degassed together with the water vapor circulation line 32 and the reaction channel 14 of the reactor 16. The steam circulation line 32 is provided with an open / close valve 42 for switching between communication and non-communication between the steam channel 34 and the reaction channel 14. Further, the lower portion of the steam flow path 34 in the gravity direction is communicated with the water tank 46 through the water circulation line 44. The water circulation line 44 is provided with a water pump 48 and an on-off valve 50. The water tank 46 stores the water condensed in the steam channel 34 as water for evaporating in the steam channel 34. The water pump 48 operates to supply water in the water tank 46 to the steam flow path 34.

  A refrigerant circulation line 52 is connected to the medium flow path 38. In the refrigerant circulation line 52, a cooler 54 and a refrigerant pump 56 are provided in series with the medium flow path 38. Thus, when the refrigerant pump 56 is operated, the refrigerant circulates through the medium flow path 38 and the cooler 54, and the heat of condensation of water vapor in the medium flow path 38 is radiated by the cooler 54. That is, in the chemical heat storage system 10 for a vehicle, it can be understood that a condenser cooling system 58 for maintaining condensation from water vapor to water in the medium flow path 38 constituting the evaporator / condenser 30 is configured. it can.

  The refrigerant circulation line 52 is branched on each of the upstream side and the downstream side of the medium flow path 38 and is connected to the cooling water circulation line 62 at each branch point. In the cooling water circulation line 62, a cooler 64, a cooling water pump 66, and an internal combustion engine EG are provided in series with the medium flow path 38. As a result, the coolant pump 66 is operated, whereby the engine coolant circulates through the internal combustion engine EG, the medium flow path 38, and the cooler 64, and evaporates the water in the steam flow path 34. That is, in the chemical heat storage system 10 for vehicles, the temporary heating system 60 for temporarily providing the heat of evaporation for water evaporation in the medium flow path 38 of the evaporator / condenser 30 is configured. Can be caught. The refrigerant circulation line 52 is an example of a first refrigerant path structure, and the cooling water circulation line 62 is an example of a second refrigerant path structure.

  At two connection positions (branch positions) of the refrigerant circulation line 52 and the cooling water circulation line 62, the medium flowing through the medium flow path 38 is used as either the refrigerant in the refrigerant circulation line 52 or the engine cooling water in the cooling water circulation line 62. Switching valves 68A and 68B for switching whether to perform or not are provided.

  The vehicular chemical heat storage system 10 also includes an evaporator heating system (not shown) for applying heat of evaporation for water evaporation in the medium flow path 38 of the evaporator / condenser 30. The evaporator heating system is configured to obtain water vapor by evaporating water in the steam channel 34 by flowing a heat medium through the medium channel 38. The evaporator / condenser 30 is configured to release heat (heat exchange) from the heat medium to water.

  Further, as shown in FIG. 2, the vehicle chemical heat storage system 10 includes a heat storage ECU 82 as a control unit. The heat storage ECU 82 is electrically connected to each of the on-off valves 42 and 50, the switching valves 68A and 68B, the water pump 48, the refrigerant pump 56, the cooling water pump 66, and the coolers 54 and 64, and controls these operations. It is supposed to be.

  The heat storage ECU 82 is supplied with a signal corresponding to the driving state of the vehicle applied from a start switch (operation control ECU or main controller) (not shown) of the vehicle. The heat storage ECU 82 is electrically connected to a chemical heat storage material temperature sensor 88 that outputs a signal corresponding to the temperature fluctuation of the chemical heat storage material of the reactor 16.

  Next, the principle of this embodiment will be described.

  First, as shown in FIG. 3A, during the heat storage operation, the evaporator / condenser 30 has a saturated vapor pressure smaller than the saturated vapor pressure (11.6 kPa) at the reaction equilibrium pressure level at the heat storage temperature (424 ° C.). By setting the temperature (40 ° C.), the water vapor obtained by the dehydration reaction of the reactor 16 is recovered in the evaporator / condenser 30.

  In addition, as shown in FIG. 3B, at the time of heat release operation, the evaporator / condenser 30 is at a temperature (0 ° C.) at which the saturated vapor pressure (0.65 kPa) at the reaction equilibrium pressure level at the heat release temperature (330 ° C.). By setting to, water vapor is supplied to the reactor 16, and the temperature of the reactor 16 is raised by the hydration reaction, and heat utilization below the heat release temperature becomes possible.

  Here, when using heat at the heat storage temperature level (424 ° C.), it is necessary to set the evaporation condensation temperature so that the saturated vapor pressure (11.6 kPa) is higher than the normal heat radiation mode. While the temperature of the reactor 16 decreases due to the intermittent heat storage operation, as shown in FIG. 4, the temperature at which the evaporator / condenser 30 becomes a saturated vapor pressure (for example, 23 kPa) higher than the reaction equilibrium pressure at the heat storage temperature. By setting to (for example, 65 ° C.), as shown in FIG. 5 (B), the amount of water vapor for reaction necessary for the sensible heat rise in the reactor 16 is supplied, and dehydration reaction is performed by temporary hydration reaction. The temperature can be raised to the temperature level. At this time, compared with the temperature rise by heat exchange with the external heat source (engine exhaust heat) as shown in FIG. 5A, the internal heat generation is utilized, so that smooth heat generation is possible. For this reason, it is possible to raise the temperature of the reactor 16 in a short time immediately before the engine operation is resumed, and it is possible to efficiently raise the temperature during a short engine operation time to ensure a heat storage period.

  Further, a heating path in which a cooling water circulation line 62 that is a circulation path of engine cooling water is connected to the medium flow path 38 of the evaporator / condenser 30 and a refrigerant circulation line 52 that is a circulation path of refrigerant for cooling the medium are provided. By switching the connected cooling path with switching valves 68A and 68B, a heat exchange mode with a high-temperature heat source that enables steam generation for the temperature rising process of the reactor 16 by temporary hydration reaction, and heat storage A longer heat storage period is secured by switching the medium flow path 38 to be connected to the cooling path at the time of restart and instantaneously switching the cooling mode for condensing the vapor generated by the dehydration reaction by the switching valves 68A and 68B. Is possible.

  Next, the operation of the first embodiment will be described.

  Control of the heat storage ECU 82 of the vehicle chemical heat storage system 10 applied to an automobile will be described with reference to a heat storage mode transition control processing routine shown in FIG. 7 and 8 showing the operation of the vehicle chemical heat storage system 10, the solid line indicates the flow of fluid such as water, water vapor, and each heat medium, and the imaginary line indicates a line without flow, Open arrows indicate heat transfer, and black valve ports indicate closed flow. Further, in FIGS. 7 and 8, illustration of components that are not involved in the mode to be described may be omitted.

  When the internal combustion engine EG starts operating, the heat storage ECU 82 executes a heat storage mode transition control processing routine.

  First, in step 100, the switching valves 68A and 68B are controlled so that the engine coolant in the coolant circulation line 62 flows through the medium flow path 38. Further, the on-off valves 42 and 50 are opened, and the cooling water pump 66 and the cooler 64 are operated. As a result, as shown in FIG. 7, the engine coolant circulates through the coolant circulation line 62 in the order of the internal combustion engine EG, the evaporator / condenser 30, and the cooler 64. Further, the engine cooling water flows through the medium flow path 38, the water in the vapor flow path 34 is evaporated in the evaporator / condenser 30, and water vapor is supplied to the reaction flow path 14. The reactor 16 self-heats by a temporary hydration reaction.

  In step 102, based on the output from the chemical heat storage material temperature sensor 88, it is determined whether or not the temperature of the reactor 16 is equal to or higher than the heat storage temperature (424 ° C.). When the temperature reaches 424 ° C., the routine proceeds to step 104.

  In step 104, the switching valves 68A and 68B are controlled so that the refrigerant in the refrigerant circulation line 52 flows through the medium flow path 38, and the cooling water pump 66 and the cooler 64 are stopped to perform heat storage mode transition control processing. End the routine.

  Then, the heat storage mode is started, and the refrigerant pump 56 and the cooler 54 of the condenser cooling system 58 are operated. Thereby, as shown in FIG. 8, the refrigerant circulates through the refrigerant circulation line 52 in the order of the cooler 54 and the evaporator / condenser 30.

  In the reactor 16, the chemical heat storage material in the reaction channel 14 undergoes a dehydration reaction by the heat supplied from the internal combustion engine EG, and heat storage to the chemical heat storage material is performed. Then, when the water vapor generated by the dehydration reaction of the chemical heat storage material is introduced into the vapor flow path 34 of the evaporator / condenser 30 via the water vapor circulation line 32, the water vapor and the refrigerant flowing through the medium flow path 38 It is condensed by heat exchange and collected in the water tank 46 by gravity. The refrigerant heated by heat exchange with water vapor is cooled by exchanging heat with the outside air in the cooler 54. Thereby, the heat storage operation in the reactor 16 is maintained.

  Further, based on the signal from the chemical heat storage material temperature sensor 88, when a temperature increase (sensible heat) of a predetermined value or more of the chemical heat storage material is detected, it is determined that the heat storage is completed, and the heat storage ECU 82 sets the on-off valves 42 and 50 respectively. While closing, the refrigerant | coolant pump 56 and the cooler 54 of the condenser cooling system 58 are stopped, and heat storage mode is complete | finished.

  In addition, when heating of the heating target is required and transition to the heat dissipation mode is performed, the required heat amount (W) of the heating target is obtained, and the heat storage ECU 82 radiates heat to the reactor 16 (chemical heat storage material) by the required heat amount. The amount of hydration reaction (W) is calculated. Further, the heat storage ECU 82 opens the on-off valves 42 and 50 and operates the water pump 48.

  Next, the heat storage ECU 82 controls the evaporator heating system so that the vaporizer / condenser 30 generates an amount of water vapor necessary for performing the hydration reaction, and the heating medium of the evaporator heating system is the evaporator / condenser. The 30 medium flow paths 38 are used for heat exchange (applying condensation heat) with water supplied from the water tank 46 to the steam flow path 34. Thereby, water vapor is supplied from the steam channel 34 to the reaction channel 14 of the reactor 16, and the chemical heat storage material in the reaction channel 14 undergoes a hydration reaction and dissipates heat along with the hydration reaction. This heat is transported to the object to be heated by the air flowing through the heat transport line, and contributes to heating (warming up) of the object to be heated.

  Further, the heat storage ECU 82 determines whether or not the temperature increase of the heating target has been completed, and if it is determined that the temperature increase of the heating target has been completed, the heat storage ECU 82 closes the on-off valves 42 and 50 respectively, The pump 48 is stopped and the heat dissipation mode is terminated.

  As described above, according to the vehicle chemical heat storage system according to the first embodiment, when heat storage by the reactor is started, water vapor higher than the reaction equilibrium pressure of water vapor released by heat storage is evaporated and condensed. Control to supply from the reactor to the reactor, temporarily cause the hydration reaction of the chemical heat storage material of the reactor, and by self-heating the reactor, the heating time until the heat storage is restarted Can be shortened.

  Also, a cooling path in which a cooling water circulation line that is a circulation path of engine cooling water is connected to a medium flow path of the evaporator / condenser, and a refrigerant circulation line that is a circulation path of refrigerant for cooling the medium is connected Can be switched instantaneously from a temporary hydration reaction to a heat storage state when heat storage is performed by the reactor.

  In addition, in order to raise the temperature of the reactor to the temperature level at which heat can be stored during heat storage, the evaporator / condenser is set to a temperature at which the saturated vapor pressure is equal to or higher than the reaction equilibrium pressure at the heat storage temperature without exchanging heat with an external heat source. Thus, the internal heat generated by the temporary hydration reaction can be used to raise the temperature of the heat storage material to the dehydration temperature range efficiently.

(Second Embodiment)
A vehicular chemical heat storage system 210 according to a second embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 is a schematic system configuration diagram showing a schematic overall configuration of the vehicular chemical heat storage system 210. As shown in this figure, the vehicular chemical heat storage system 210 is configured such that the cooler 54 is used in both the circulation of the refrigerant by the refrigerant circulation line and the circulation of the engine cooling water by the cooling water circulation line. It differs from the vehicle chemical heat storage system 10 according to the first embodiment in that it is provided in front of the medium inlet of the evaporator / condenser 30.

  Further, the vehicle chemical heat storage system 210 is provided with a cooling water temperature sensor (not shown) for detecting the temperature of the engine cooling water on the downstream side of the internal combustion engine EG in the cooling water circulation line, and the heat storage ECU 82 is electrically connected to the cooling water temperature sensor. It is connected to the.

  Next, the principle of this embodiment will be described.

  When engine cooling water (65 ° C.) is used as a heat source for supplying steam necessary for the temporary hydration reaction, a high steam saturation pressure (23 kPa) is obtained. At this time, since it becomes the dehydration reaction equilibrium temperature (424 ° C.), it becomes possible to secure a high-temperature internal heat source, and heat conduction due to the temperature difference becomes active. Furthermore, since the conduction path is only the heat conduction of the heat storage material, a high heat transport capability can be expected with a small temperature difference compared to heat exchange with an external heat source. On the other hand, when the engine cooling water exceeds 65 ° C., the saturated vapor pressure increases excessively, so that the reaction equilibrium temperature> 424 ° C. At this time, the cooling device 54 in the refrigerant circulation line can be used also for the circulation of the engine cooling water through the cooling water circulation line, so that when the engine cooling water exceeds 65 ° C., the cooling device 54 is operated to It can be controlled to lower the water temperature.

  A heat storage mode transition control processing routine according to the second embodiment will be described with reference to FIG. In addition, about the process similar to 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  First, in step 100, the switching valves 68A and 68B are controlled so that the engine coolant in the coolant circulation line 62 flows through the medium flow path 38. Further, the on-off valves 42 and 50 are opened, and the cooling water pump 66 and the cooler 64 are operated.

  In step 102, based on the output from the chemical heat storage material temperature sensor 88, it is determined whether or not the temperature of the reactor 16 is equal to or higher than the heat storage temperature (424 ° C.). When the temperature reaches 424 ° C., the routine proceeds to step 104. On the other hand, when it is determined that the temperature of the reactor 16 has not reached the heat storage temperature (424 ° C.), in step 250, the water temperature of the engine cooling water is, for example, 70 ° C. based on the output from the cooling water temperature sensor. Whether it is above or not is determined, and if the engine coolant temperature is less than 70 ° C., the process returns to step 102. On the other hand, when the engine coolant temperature is 70 ° C. or higher, the cooler 54 is operated in step 252 and the process returns to step 102.

  In step 104, the switching valves 68A and 68B are controlled so that the refrigerant in the refrigerant circulation line 52 flows through the medium flow path 38, the cooling water pump 66 and the cooler 64 are stopped, and the heat storage mode transition control processing routine. Exit.

  In addition, about the other structure and effect | action of the chemical thermal storage system 210 for vehicles which concern on 2nd Embodiment, since it is the same as that of 1st Embodiment, description is abbreviate | omitted.

  As described above, according to the vehicle chemical heat storage system according to the second embodiment, the cooling path cooler is installed in the vicinity of the inlet of the evaporator / condenser, and can be used as both the cooling path and the heating path. It is possible to control the equilibrium temperature level of internal heat generation in the heat storage material by adjusting the temperature of the engine cooling water as a high temperature heat source and adjusting the temperature of the evaporator / condenser, and the chemical heat storage of the reactor The temporary hydration reaction of the material can prevent the reactor from excessively self-heating.

(Third embodiment)
A vehicle chemical heat storage system 310 according to a third embodiment of the present invention will be described with reference to FIGS. 11 and 12. FIG. 11 is a schematic system configuration diagram showing a schematic overall configuration of the vehicular chemical heat storage system 310. As shown in this figure, the vehicle chemical heat storage system 310 includes the evaporator 330 that supplies water vapor for temporary hydration reaction by the reactor 16, and therefore the vehicle according to the first embodiment. This is different from the chemical heat storage system 10 for use.

  Specifically, the vehicle chemical heat storage system 310 includes an evaporator 330 for evaporating water and temporarily supplying water vapor to the reactor 16, and the evaporator 330 is a reaction flow path 14 of the reactor 16. A vapor buffer 334 communicated with the second vapor circulation line 332 and a medium flow path 338 for evaporating water in the vapor buffer 334 are formed in the container 340. The medium flow path 338 is provided adjacent to the vapor buffer 334 (not shown) so that heat exchange between the medium flowing inside and the water in the vapor buffer 334 is possible.

  The vapor buffer 334 is evacuated together with the second water vapor circulation line 332 and the reaction flow path 14 of the reactor 16. The second water vapor circulation line 332 is provided with an open / close valve 342 for switching between communication and non-communication between the vapor buffer 334 and the reaction flow path 14. Further, a low portion in the gravity direction in the steam buffer 334 is communicated with the water tank 46 via the second water circulation line 344. The water circulation line 344 is provided with a second water pump 348 and a second on-off valve 350. The second water pump 48 operates to supply water in the water tank 46 to the steam buffer 334.

  The medium flow path 338 is connected to the second cooling water circulation line 362. The second cooling water circulation line 362 is provided so as to branch from the cooling water circulation line 62 between the cooling water outlet side of the internal combustion engine EG and before the cooler 64, and the engine cooling water in the cooling water circulation line 62 is supplied to the second cooling water circulation line. The line 362 also flows. Thus, the coolant pump 66 is operated, whereby the engine coolant circulates through the internal combustion engine EG, the medium flow path 338, and the cooler 64 to evaporate the water in the steam buffer 334.

  The vehicle chemical heat storage system 310 is provided with a water vapor temperature sensor (not shown) for detecting the temperature of water vapor in the steam flow path 34, and the heat storage ECU 82 is electrically connected to the water vapor temperature sensor.

  Next, the principle of this embodiment will be described.

  When the evaporation for the temporary hydration reaction is realized by the evaporator / condenser 30, it is necessary to change the temperature to the evaporation temperature (65 ° C.). At this time, a temperature response delay occurs due to the heat capacity of the container of the evaporator / condenser 30 and water for evaporation. For this reason, instantaneous switching to a temporary hydration reaction becomes impossible. Therefore, the vapor buffer 334 is set to the evaporation temperature (65 ° C.) in the temporary hydration reaction, and the connection to the reactor 16 is switched by the on-off valves 42 and 342, thereby hydration at the heat storage temperature level (424 ° C.). An instantaneous switch to vapor pressure to maintain the reaction is possible.

  Next, a heat storage mode transition control processing routine according to the third embodiment will be described with reference to FIG. In addition, about the process similar to 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  First, in step 370, the switching valves 68A and 68B are controlled so that the engine coolant of the coolant circulation line 62 flows through the medium flow path 38. Further, the on-off valves 50 and 350 are opened, and the cooling water pump 66 and the cooler 64 are operated. Accordingly, the engine coolant circulates through the coolant circulation line 62 and the second coolant circulation line 362 in the order of the internal combustion engine EG, the evaporator / condenser 30, and the cooler 64. Further, the engine cooling water flows through the medium flow path 38, and the engine cooling water flows through the second medium flow path 38. In the evaporator / condenser 30, the water in the steam flow path 34 is evaporated, and in the evaporator 330, the water in the steam buffer 334 is evaporated.

  In step 372, the on-off valve 42 is closed, and in step 374, the on-off valve 342 is opened. Thereby, water vapor is supplied from the vapor buffer 334 to the reaction channel 14. The reactor 16 self-heats by a temporary hydration reaction.

  In step 376, based on the output from the water vapor temperature sensor, the temperature of the water vapor in the vapor channel 34 is equal to or higher than a temperature (eg, 65 ° C.) at which the saturated vapor pressure (eg, 23 kPa) is equal to or higher than the reaction equilibrium pressure at the heat storage temperature. When the temperature of the water vapor in the steam channel 34 reaches 65 ° C., the process proceeds to step 378.

  In step 378, the on-off valve 342 is closed, and in step 380, the on-off valve 42 is opened. As a result, water vapor is supplied from the vapor channel 34 to the reaction channel 14, and the reactor 16 further self-heats due to a temporary hydration reaction.

  In the next step 102, based on the output from the chemical heat storage material temperature sensor 88, it is determined whether or not the temperature of the reactor 16 is equal to or higher than the heat storage temperature (424 ° C.). When the temperature (424 ° C.) is reached, the routine proceeds to step 104.

  In step 104, the switching valves 68A and 68B are controlled so that the refrigerant in the refrigerant circulation line 52 flows through the medium flow path 38, and the cooling water pump 66 and the cooler 64 are stopped to perform heat storage mode transition control processing. End the routine.

  In addition, about the other structure and effect | action of the chemical thermal storage system 310 for vehicles which concern on 3rd Embodiment, since it is the same as that of 1st Embodiment, description is abbreviate | omitted.

  As described above, according to the vehicle chemical heat storage system according to the third embodiment, when the heat storage by the reactor is started, the steam higher than the reaction equilibrium pressure of the steam released from the steam buffer by the heat storage. Is controlled to be supplied to the reactor, temporarily causing a hydration reaction of the chemical heat storage material of the reactor, and by self-heating the reactor, the heating time until restarting the heat storage is shortened can do.

(Fourth embodiment)
A vehicle chemical heat storage system according to a fourth embodiment of the present invention will be described with reference to FIG. The vehicular chemical heat storage system according to the fourth embodiment of the present invention has the same configuration as the vehicular chemical heat storage system 310 according to the third embodiment. The vehicle chemical heat storage system according to the present embodiment is the third point in that water vapor for temporary hydration reaction by the reactor 16 is supplied only from the evaporator 330 and is not supplied from the evaporator / condenser 30. This differs from the vehicle chemical heat storage system 310 according to the embodiment.

  Next, the principle of this embodiment will be described.

  When condensation in heat storage and evaporation for temporary hydration reaction are made compatible in the evaporator / condenser 30, between the condensation temperature (40 ° C) and the evaporation temperature (65 ° C) (temperature difference 25 ° C) It is necessary to change the temperature. At this time, a temperature response delay occurs due to the heat capacity of the container of the evaporator / condenser 30 and water for evaporation. Therefore, the evaporator / condenser 30 is set to the condensation temperature (40 ° C.) at the time of heat storage, the vapor buffer 334 is set to the evaporation temperature (65 ° C.) in the temporary hydration reaction, and the on-off valves 42 and 342 are used to react the reactor. By switching the connection to 16, the steam pressure for maintaining the hydration reaction at the heat storage temperature level (424 ° C.) can be switched more instantaneously to the steam pressure at the condensation temperature at the time of heat storage.

  A heat storage mode transition control processing routine according to the fourth embodiment will be described with reference to FIG. In addition, about the process similar to 1st Embodiment and 3rd Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  First, in step 400, the switching valves 68A and 68B are controlled and the refrigerant pump 56 and the cooler 54 are operated so that the refrigerant in the refrigerant circulation line 52 flows through the medium flow path 38. Thereby, the refrigerant circulates in the refrigerant circulation line 52 in the order of the cooler 54 and the evaporator / condenser 30.

  In step 372, the on-off valve 42 is closed, and in step 374, the on-off valve 342 is opened. Thereby, water vapor is supplied from the vapor buffer 334 to the reaction channel 14. The reactor 16 self-heats by a temporary hydration reaction.

  In the next step 102, based on the output from the chemical heat storage material temperature sensor 88, it is determined whether or not the temperature of the reactor 16 is equal to or higher than the heat storage temperature (424 ° C.). When the temperature (424 ° C.) is reached, the process proceeds to step 402.

  In step 402, the on-off valve 342 is closed, and in step 404, the on-off valve 42 is opened, and the heat storage mode transition control processing routine ends. As a result, the water vapor generated by the dehydration reaction of the chemical heat storage material is introduced into the vapor flow path 34 of the evaporator / condenser 30 via the water vapor circulation line 32, and the water vapor is heated with the refrigerant flowing through the medium flow path 38. It is condensed by exchange.

  In addition, about the other structure and effect | action of the chemical thermal storage system 310 for vehicles which concern on 4th Embodiment, since it is the same as that of 1st Embodiment, description is abbreviate | omitted.

  As described above, according to the vehicle chemical heat storage system of the fourth embodiment, by connecting the steam buffer that enables temporary steam supply during heat storage to the reactor, The transition from a temporary hydration reaction by supplying steam to a heat storage reaction in which the evaporator / condenser is set to the condensation temperature can be instantaneously switched.

(Fifth embodiment)
A vehicular chemical heat storage system 510 according to a fifth embodiment of the present invention will be described with reference to FIGS. 14 and 15. FIG. 14 shows a schematic overall system configuration of the vehicular chemical heat storage system 510 in a schematic system configuration diagram. As shown in this figure, the vehicular chemical heat storage system 510 has a third feature in that the steam buffer 334 and the steam flow path 34 are connected via the steam circulation line 32 and the second steam circulation line 332. This differs from the vehicle chemical heat storage system 310 according to the embodiment.

  Specifically, the vehicular chemical heat storage system 510 includes an evaporator 330 configured using a vapor buffer 334 and a medium flow path 338, and the vapor buffer 334 includes the second water vapor circulation line 332 and the reactor 16. The reaction channel 14 is vacuum deaerated. The second water vapor circulation line 332 is provided with an open / close valve 342 for switching between communication and non-communication between the vapor buffer 334 and the reaction flow path 14.

  The medium flow path 338 is connected to the second cooling water circulation line 362. The second cooling water circulation line 362 is provided so as to branch from the cooling water circulation line 62 at the cooling water outlet side of the internal combustion engine EG and before the cooler 64.

  The second water vapor circulation line 332 is connected to the water vapor circulation line 32 between the reaction flow path 14 and the on-off valve 42 so that the water vapor in the second water vapor circulation line 332 also flows into the water vapor circulation line 32. It is configured.

  In addition, the chemical heat storage system 510 for a vehicle is provided with a chemical heat storage material temperature sensor 88 and a water vapor temperature sensor (not shown) in the vapor flow path 34, and a second water vapor temperature for detecting the temperature of the water vapor in the vapor buffer 334. A sensor (not shown) is provided, and the heat storage ECU 82 is electrically connected to the chemical heat storage material temperature sensor 88, the water vapor temperature sensor, and the second water vapor temperature sensor.

  Next, the principle of this embodiment will be described.

  It is possible to set the evaporator / condenser 30 to a condensation temperature (40 ° C.) and the evaporator 330 to an evaporation temperature (65 ° C.) for a temporary hydration reaction. On the other hand, when the engine cooling water exceeds 65 ° C. in the temperature rise of the reactor 16, the saturated vapor pressure of the water vapor in the second water vapor circulation line 332 increases excessively, so that the reaction equilibrium temperature> 424 ° C. At this time, the on-off valve 42 that connects the evaporator / condenser 30 and the reactor 16 is intermittently opened to suppress an excessive increase in the steam pressure of the steam in the second steam circulation line 332, and the temperature of the reactor 16. Can be controlled. By improving the temperature responsiveness of the reactor 16, it is possible to raise the temperature of the reactor in a short time immediately before the engine operation is resumed, and to efficiently raise the temperature during a short engine operation time to ensure a heat storage period. It becomes possible. Furthermore, the heat of the chemical heat storage material of the reactor 16 can be effectively utilized by preventing the temperature of the reactor 16 from rising more than necessary (> dehydration reaction temperature).

  A heat storage mode transition control processing routine according to the fifth embodiment will be described with reference to FIG. In addition, about the process similar to 1st Embodiment and 3rd Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  First, in step 370, the switching valves 68A and 68B are controlled so that the engine coolant of the coolant circulation line 62 flows through the medium flow path 38. Further, the on-off valves 50 and 350 are opened, and the cooling water pump 66 and the cooler 64 are operated.

  In step 372, the on-off valve 42 is closed, and in step 374, the on-off valve 342 is opened.

  In the next step 550, based on the output from the second water vapor temperature sensor, the temperature of the water vapor in the vapor buffer 334 exceeds the evaporation temperature for the temporary hydration reaction, for example, 70 ° C. or more. If the temperature of the water vapor in the steam buffer 334 reaches 70 ° C. or higher, the on-off valve 42 is intermittently opened in step 552, and the process proceeds to step 376. Thereby, an excessive increase in the vapor pressure supplied to the reaction channel 14 is suppressed. On the other hand, if the temperature of the water vapor in the steam buffer 334 is less than 70 ° C., the open / close valve 42 is closed in step 554, and the process proceeds to step 376.

  In step 376, based on the output from the water vapor temperature sensor, the temperature of the water vapor in the vapor channel 34 is equal to or higher than a temperature (eg, 65 ° C.) at which the saturated vapor pressure (eg, 23 kPa) is equal to or higher than the reaction equilibrium pressure at the heat storage temperature. When the temperature of the water vapor in the steam channel 34 reaches 65 ° C., the process proceeds to step 378. On the other hand, the temperature of the water vapor in the steam channel 34 is less than 65 ° C. If yes, the process returns to step 550.

  In step 378, the on-off valve 342 is closed, and in step 380, the on-off valve 42 is opened.

  In the next step 102, based on the output from the chemical heat storage material temperature sensor 88, it is determined whether or not the temperature of the reactor 16 is equal to or higher than the heat storage temperature (424 ° C.). When the temperature (424 ° C.) is reached, the routine proceeds to step 104.

  In step 104, the switching valves 68A and 68B are controlled so that the refrigerant in the refrigerant circulation line 52 flows through the medium flow path 38, the cooling water pump 66 and the cooler 64 are stopped, and the heat storage mode transition control processing routine. Exit.

  In addition, about the other structure and effect | action of the chemical thermal storage system 510 for vehicles which concern on 5th Embodiment, since it is the same as that of 1st Embodiment, description is abbreviate | omitted.

  As described above, according to the chemical heat storage system for a vehicle according to the fifth embodiment, the steam buffer that enables temporary steam supply during the heat storage and the evaporation / condenser are connected, and the steam buffer It is possible to control the equilibrium temperature level of internal heat generation in the heat storage material by adjusting the water vapor pressure, adjusting the pressure of the water vapor, and adjusting the temperature of the evaporator / condenser. The temporary hydration reaction of the material can prevent the reactor from excessively self-heating.

  In the fifth embodiment, the case where water vapor for temporary hydration reaction is supplied from the vapor buffer 334 and the evaporator / condenser 30 has been described as an example, but the present invention is not limited to this. Instead of this, as in the above-described fourth embodiment, control may be performed so that water vapor for temporary hydration reaction is supplied only from the vapor buffer 334. Thereby, the transition from the temporary hydration reaction by the supply of steam from the steam buffer 334 to the heat storage reaction in which the evaporator / condenser 30 is set to the condensation temperature can be switched more instantaneously.

  Moreover, in said 1st Embodiment-5th Embodiment, the case where the completion | finish timing of temporary hydration reaction is judged as an example by whether the temperature of the reactor became 424 degreeC or more was taken as an example. Although described, the present invention is not limited to this, and it is necessary to obtain a predetermined requirement for raising the temperature of the reactor to 424 ° C. after starting the supply of water vapor for temporary hydration reaction. The end timing of the temporary hydration reaction may be determined based on whether or not time has elapsed.

  In the above-described embodiment, an example in which the vehicle chemical heat storage system is configured by including the evaporator / condenser 30 having both the function as an evaporator and the function as a condenser has been described. However, the present invention is not limited thereto. For example, the vehicular chemical heat storage system may include an evaporator and a condenser that are independently configured.

10, 210, 310, 510 Chemical heat storage system for vehicle 14 Reaction flow path 16 Reactor 18 Air flow path 30 Evaporation / condenser 32, 332 Steam circulation line 34 Steam flow path 38, 338 Medium flow path 42, 342 On-off valve 52 Refrigerant circulation line 54 Cooler 62, 362 Cooling water circulation line 64 Cooler 68A, 68B switching valve 82 Heat storage ECU
88 Chemical heat storage material temperature sensor 330 Evaporator 334 Steam buffer EG Internal combustion engine

Claims (8)

Reactor with a built-in chemical heat storage material that performs dehydration reaction by heat supply from the vehicle and stores heat, and dissipates heat by hydration reaction;
Water vapor released from the reactor during the dehydration reaction is condensed by heat exchange with the refrigerant, and water is evaporated by heat exchange with the refrigerant, whereby the water vapor for the hydration reaction is reacted with the reaction. An evaporative condensing unit to be supplied to the vessel,
A control unit that controls to supply water vapor, which is higher than a reaction equilibrium pressure of water vapor released by heat storage, from the evaporative condenser to the reactor when starting heat storage by the reactor;
A chemical heat storage system for vehicles. A first refrigerant path structure capable of circulating a refrigerant for condensing water vapor, bypassing the cooler;
A second refrigerant path structure capable of circulating a refrigerant for bypassing a heat source and supplying water vapor higher than the reaction equilibrium pressure;
A refrigerant switching unit that switches the refrigerant that is heat-exchanged in the evaporating and condensing unit to one of the refrigerant that circulates in the first refrigerant path structure and the second refrigerant path structure;
The control unit switches the refrigerant to be heat-exchanged in the evaporative condensing unit to the refrigerant of the second refrigerant path structure when starting the heat storage by the reactor, and then switches the refrigerant of the first refrigerant path structure. The vehicular chemical heat storage system according to claim 1, wherein the refrigerant switching unit is controlled to switch to a refrigerant. A temperature detection unit that detects a temperature of the refrigerant of the second refrigerant path structure;
The cooler is provided in front of the refrigerant inlet of the evaporative condensing unit,
The second refrigerant path structure circulates the refrigerant bypassing the heat source and the cooler,
When the controller supplies steam higher than the reaction equilibrium pressure to the reactor, based on the temperature of the refrigerant detected by the temperature detector, the temperature of the refrigerant does not exceed a predetermined temperature. The chemical heat storage system for vehicles according to claim 2 which controls operation of said cooler. Reactor with a built-in chemical heat storage material that performs dehydration reaction by heat supply from the vehicle and stores heat, and dissipates heat by hydration reaction;
Water vapor released from the reactor during the dehydration reaction is condensed by heat exchange with the refrigerant, and water is evaporated by heat exchange with the refrigerant, whereby the water vapor for the hydration reaction is reacted with the reaction. An evaporative condensing unit to be supplied to the vessel,
A water vapor buffer for supplying to the reactor water vapor that is higher than the reaction equilibrium pressure of water vapor released by heat storage;
A controller that controls to supply steam higher than the reaction equilibrium pressure from the water vapor buffer to the reactor when starting heat storage by the reactor;
A chemical heat storage system for vehicles.   The vehicular chemical heat storage system according to claim 4, further comprising a refrigerant path structure capable of circulating a refrigerant for condensing water vapor by bypassing the cooler. A temperature detector for detecting the temperature of water vapor supplied from the evaporative condenser;
A first refrigerant path structure capable of circulating a refrigerant for condensing water vapor, bypassing the cooler;
A second refrigerant path structure capable of circulating a refrigerant for bypassing a heat source and supplying water vapor higher than the reaction equilibrium pressure;
A refrigerant switching unit that switches the refrigerant that is heat-exchanged in the evaporating and condensing unit to one of the refrigerant that circulates in the first refrigerant path structure and the second refrigerant path structure;
The control unit controls to supply water vapor higher than the reaction equilibrium pressure from the water vapor buffer to the reactor when heat storage by the reactor is started, and refrigerant to be heat-exchanged in the evaporative condensation unit The refrigerant switching unit is controlled to switch the refrigerant to the refrigerant having the second refrigerant path structure, and the temperature of the water vapor detected by the temperature detection unit is a temperature at which the saturated vapor pressure is equal to or higher than the reaction equilibrium pressure. In this case, the refrigerant switching is performed so that the steam exchanged in the evaporative condensing unit is switched to the refrigerant having the first refrigerant path structure after controlling to supply water vapor from the evaporative condenser to the reactor. The chemical heat storage system for vehicles according to claim 4 which controls a section.   The chemical vapor storage system for vehicles according to claim 6 with which said water vapor buffer supplies said water vapor by heat exchange with a refrigerant of said 2nd refrigerant path structure. A second temperature detector for detecting the temperature of water vapor supplied from the water vapor buffer;
The water vapor buffer is configured to be able to supply the water vapor to the evaporative condenser together with the reactor,
When the control unit supplies the water vapor from the water vapor buffer to the reactor, the temperature detected by the second temperature detection unit is equal to or higher than a temperature at which the saturated vapor pressure is higher than the reaction equilibrium pressure. The vehicle chemical heat storage system according to any one of claims 4 to 7, wherein in some cases, a part of the water vapor supplied from the water vapor buffer is controlled to be supplied to the evaporative condenser.

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