JP2013113551A - Chemical heat storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely calculate a heat storage amount when electric energy is converted into heat and stored.SOLUTION: A chemical heat storage system detects a current and a voltage supplied from an electric power supply part 90 to an electric heater by a current/voltage detection part 94, and detects a temperature of an electric heater layer 16B by an internal temperature sensor 88. An electric energy control part controls electric energy supplied from the electric power supply part 90 based upon the detected temperature. Further, a heat storage ECU calculates the heat storage amount of a reactor 16 based upon the current and voltage detected by the current/voltage detection part 94, and the temperature detected by the internal temperature sensor 88.

Description

  The present invention relates to a chemical heat storage system for effectively using generated electricity.

  Conventionally, electric double layer capacitors, flywheels (for example, Patent Documents 1 and 2), sensible heat, and latent heat storage are known as energy storage means other than secondary batteries.

U.S. Pat. No. 4,423,794 British Patent No. 2449117

  However, the conventional techniques as described above have a problem that the energy storage density is low and a problem that long-term storage is not possible. In addition, when the electric energy is converted into heat and stored, it becomes necessary to accurately grasp the heat storage amount when intermittent power supply conditions are met.

  An object of the present invention is to obtain a chemical heat storage system that can accurately calculate the amount of heat storage in the case where electric energy is converted into heat and stored in consideration of the above facts.

  A chemical heat storage system according to a first aspect of the present invention includes an energy conversion unit that converts electricity into heat, and a chemical heat storage material that stores heat by performing a dehydration reaction by supplying heat from the energy conversion unit, and dissipates heat by a hydration reaction. And the water vapor released from the reactor during the dehydration reaction is condensed by heat exchange with the refrigerant, and the water is evaporated by heat exchange with the refrigerant. An evaporative condensing unit for supplying water vapor for the sum reaction to the reactor, a power supplying unit for supplying power to the energy converting unit, a current supplied from the power supplying unit to the energy converting unit, and an applied current A current voltage detector that detects voltage, a temperature detector that detects the temperature of the energy converter, and a temperature that is detected by the temperature detector, are supplied from the power supply unit. A heat storage unit that calculates a heat storage amount of the reactor based on a power amount control unit that controls the amount of power to be generated, a current and voltage detected by the current voltage detection unit, and a temperature detected by the temperature detection unit And a quantity calculation unit.

  In the chemical heat storage system 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 the energy conversion unit. 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, the chemical heat storage system detects a current supplied from the power supply unit to the energy conversion unit and an applied voltage by a current voltage detection unit, and detects a temperature of the energy conversion unit by a temperature detection unit. To do. The amount of power supplied from the power supply unit is controlled by the power amount control unit based on the temperature detected by the temperature detection unit. Further, the heat storage amount calculation unit calculates the heat storage amount of the reactor based on the current and voltage detected by the current voltage detection unit and the temperature detected by the temperature detection unit.

  Thus, the current supplied to the energy conversion unit and the applied voltage are detected, and the temperature of the energy conversion unit is detected. Based on the detected current and voltage, and the detected temperature, the reactor By calculating the amount of stored heat, the amount of stored heat can be accurately calculated when electrical energy is converted into heat and stored.

  The chemical heat storage system according to the second invention includes an energy conversion unit that converts electricity into heat, and a chemical heat storage material that stores heat by performing a dehydration reaction by supplying heat from the energy conversion unit and dissipates heat by a hydration reaction. And the 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, thereby An evaporative condensing unit that supplies steam to the reactor, a power supply unit that supplies power to the energy conversion unit so as to have a constant voltage, and a power supply unit that supplies power to the energy conversion unit A current / voltage detector for detecting current and applied voltage; a temperature detector for detecting the temperature of the energy converter; and a current and voltage detected by the current / voltage detector. And based on the temperature detected by the temperature detecting unit is configured to include a heat storage amount calculation unit for calculating the quantity of thermal storage of the reactor.

  In the chemical heat storage system according to the second aspect of the invention, the electric power supply unit supplies electric power to the energy conversion unit so as to be a constant voltage. Here, when the dehydration is completed, the temperature of the energy conversion unit rises due to the decrease in the endothermic term Qs of the chemical heat storage material, the electrical resistance of the energy conversion unit increases, the amount of power supplied is limited, and the energy conversion unit after dehydration Is prevented from overheating.

  The heat storage amount calculation unit according to the first invention and the second invention includes the current and voltage detected by the current / voltage detection unit, the temperature detected by the temperature detection unit, and the heat capacity of the reactor obtained in advance. Based on the above, the amount of heat stored in the reactor can be calculated in accordance with the relationship between the total amount of power supplied to the energy conversion unit, the amount of sensible heat change in the heat capacity, and the amount of heat released.

  The temperature detection unit may calculate the temperature of the energy conversion unit based on the current and voltage detected by the current / voltage detection unit. Thereby, the heat storage amount can be calculated without providing a temperature sensor in the energy conversion unit.

  Further, the temperature detection unit is based on the current and voltage detected by the current / voltage detection unit and the resistance temperature coefficient, electrical resistivity, resistance cross-sectional area, and resistance length of the energy conversion unit obtained in advance. Thus, the temperature of the energy conversion unit can be calculated.

  Said electric power supply part can supply the electric power supplied from the drive part mounted in the vehicle to the said energy conversion part.

  As described above, the chemical heat storage system according to the present invention detects the current supplied to the energy conversion unit and the applied voltage, detects the temperature of the energy conversion unit, detects the detected current and voltage, and detects the detected current and voltage. By calculating the amount of heat stored in the reactor based on the temperature thus obtained, it has an excellent effect that the amount of stored heat can be accurately calculated when electrical energy is converted into heat and stored.

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. (A) It is the schematic which shows the connection relation of an electric heater and an electric power generation part, (B) It is sectional drawing which shows the structure of a reactor. It is a block diagram which shows the control structure with respect to the reactor of the chemical thermal storage system for vehicles which concerns on the 1st Embodiment of this 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. It is a graph which shows the time change of the temperature of an electric heater layer, the resistance of an electric heater, a voltage, an electric current, and electric energy. It is a graph which shows the time change of the temperature of an electric heater layer, and the heat storage amount of a reactor. It is a block diagram which shows the control structure with respect to the reactor of the chemical thermal storage system for vehicles which concerns on the 2nd Embodiment of this invention. It is a figure which shows the connection relation of a current voltage detection part and an electric heater. It is a block diagram which shows thermal storage ECU which comprises the chemical thermal storage system for vehicles which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the control structure with respect to the reactor of the chemical thermal storage system for vehicles which concerns on the 3rd Embodiment of this invention. It is a graph which shows the time change of the temperature of an electric heater layer, the resistance of an electric heater, a voltage, an electric current, and electric energy. It is a graph which shows the time change of the temperature of an electric heater layer, and the heat storage amount of a reactor.

(First embodiment)
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, in the chemical heat storage system 10 for a vehicle, a chemical heat storage material (not shown) is filled in a heat storage layer as a space for a chemical heat storage material in a container 12 made of a metal material such as stainless steel. A reactor 16 is provided. 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 ].

  Further, in this embodiment, as shown in the cross-sectional view of FIG. 2B, the container 12 of the reactor 16 has a space between the two heat storage layers 16A and the heat storage layer 16A via the partition wall 17. An electric heater layer 16B arranged so as to be adjacent to each other is provided. Thus, the electric heater layer 16B is provided adjacent to the heat storage layer 16A so that heat exchange with the chemical heat storage material in the heat storage layer 16A is possible. The electric heater layer 16B includes an electric heater as an energy conversion unit. The electric heater is configured by using, for example, a heater wire (heat generating portion) and an insulating portion. Further, a vapor diffusion layer 16C for supplying reaction medium vapor to the chemical heat storage material is provided adjacent to each of the heat storage layers 16A and on the side opposite to the electric heater layer 16B.

  As shown in FIG. 2A, the electric heater of the electric heater layer 16B is connected to a power generation unit 22 as an electric energy source via a power supply unit 90 (see FIG. 3) described later. In this embodiment, the power generation unit 22 is an electric motor. For example, the power generation unit 22 is an electric motor as a driving source of an automobile to which the vehicle chemical heat storage system 10 is applied, and surplus power that cannot charge a battery is generated by the power generation unit 22. To the power supply unit 90. 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.

  As shown in FIG. 3, the vehicle chemical heat storage system 10 is supplied from the power generation unit 22 and the internal temperature sensor 88 that outputs a signal corresponding to the temperature Td inside the electric heater layer 16 </ b> B of the reactor 16. A power supply unit 90 that supplies power to the electric heaters of the electric heater layer 16 </ b> B using the power, and a power that controls the amount of power supplied from the power supply unit 90 based on the temperature detected by the internal temperature sensor 88. An amount control unit 92 and a current / voltage detection unit 94 that detects a current supplied from the power supply unit 90 to the electric heater and an applied voltage are provided.

  The electric energy control unit 92 outputs a control signal based on the deviation ε (= Ts−Td) between the temperature Td detected by the internal temperature sensor 88 and a preset temperature Ts to the power supply unit 90. Thus, the amount of power supplied from the power supply unit 90 is controlled. Thereby, the temperature of the electric heater layer 16B can be set to a predetermined temperature.

  The reactor 16 is connected with a heat transport line (not shown). On the downstream side of the heat transport line, a heat exchanging portion with a heating target (not shown) by the vehicle chemical heat storage system 10 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 vehicle chemical heat storage system 10 also generates a condensing unit that condenses the water vapor introduced from the vapor diffusion layer 16C of the reactor 16 and water vapor that evaporates the water and supplies the water to the vapor diffusion layer 16C of the reactor 16. An evaporator / condenser 30 having a function as an evaporator is provided. The evaporator / condenser 30 condenses the steam channel 34 communicated with the vapor diffusion layer 16C of the reactor 16 through the steam circulation line 32, the steam in the steam channel 34, and the vapor channel 34 in the steam channel 34. 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 vapor flow path 34 is vacuum degassed together with the water vapor circulation line 32 and the vapor diffusion layer 16 </ b> C of the reactor 16. The steam circulation line 32 is provided with an on-off valve 42 for switching between communication and non-communication between the steam flow path 34 and the vapor diffusion layer 16C. 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 actuated so that the engine coolant circulates through the internal combustion engine EG, the medium flow path 38, and the cooler 64, and the heat medium flows through the medium flow path 38. The water is supposed to evaporate. That is, in the chemical heat storage system 10 for vehicles, it can be understood that the evaporator heating system 60 for providing the evaporation heat for the evaporation of water in the medium flow path 38 of the evaporator / condenser 30 is configured. it can. The evaporator / condenser 30 is configured to release heat (heat exchange) from the heat medium to water.

  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.

  In addition, as shown in FIG. 4, the vehicle chemical heat storage system 10 includes a heat storage ECU 82. 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 the internal temperature sensor 88 and the current / voltage detector 94.

  The heat storage ECU 82 calculates the amount of heat stored in the reactor 16 based on the current and voltage detected by the current / voltage detection unit 94 and the temperature detected by the internal temperature sensor 88.

  Here, the principle of calculating the heat storage amount in the present embodiment will be described.

  Depending on the detected current (I [A]), voltage (V [V]), and the internal temperature of the electric heater layer 16B, the amount of supplied power V × I × t [kJ] (t: heater heating time [s]) , Sensible heat change ΔHt [kJ] in total heat capacity Ct [kJ / K] (sum of heater layer heat capacity Ch, heat storage layer Cr, vapor diffusion layer Cs, reaction vessel Cv [kJ / K]) From the relationship with the heat quantity Ql, the heat storage quantity Qs [kJ] can be calculated according to the following formulas (1) and (2).

Qs [kJ] = V × l × t-ΔHt-Ql (Td ≧ Ts) (1)
Qs [kJ] = 0 (Td ≦ Ts) (2)
Change in sensible heat ΔHt [kJ] = Ct · (Td-Tl)
Reactor heat capacity Ct [kJ] = Ch + Cr + Cs + Cv
Heat dissipation Ql [kJ] = f (Td, Ti)

  However, V [V] is the detected voltage, I [A] is the detected current, Ch [kJ / K] is the heat capacity of the electric heater layer 16B determined in advance, and Cr [kJ / K] is the heat storage layer 16A determined in advance. Cs [kJ / K] is the heat capacity of the vapor diffusion layer 16C determined in advance, and Cv [kJ / K] is the heat capacity of the container 12 determined in advance. Further, Ts [° C.] is a dehydration start temperature obtained in advance, Td [° C.] is a detection temperature, and Ti [° C.] is an initial temperature obtained in advance. Further, as shown in FIG. 5, Td ≧ Ts represents a dehydration start state, and Td ≦ Ts represents a state before dehydration start.

  The heat storage ECU 82 calculates the heat storage amount of the reactor 16 according to the above equations (1) and (2). As a result, even under intermittent power supply conditions, as shown in FIG. 6, it is possible to accurately grasp the amount of heat storage and prevent excessive power supply to the electric heater that supplies heat to the heat storage material. Thus, electric energy can be used effectively.

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

  First, when power is supplied from the power generation unit 22 to the reactor 16 and the heat storage mode is started, the heat storage ECU 82 starts the power supply from the power supply unit 90 and the refrigerant pump 56 of the condenser cooling system 58. Then, the cooler 54 is operated. Thereby, the refrigerant circulates in the refrigerant circulation line 52 in the order of the cooler 54 and the evaporator / condenser 30. The heat storage ECU 82 opens the on-off valves 42 and 50, respectively.

  In the reactor 16, the chemical heat storage material of the heat storage layer 16A undergoes a dehydration reaction by the heat supplied from the electric heater layer 16B, 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.

  At this time, based on the signal from the internal temperature sensor 88, the electric energy control unit 92 controls the electric energy from the electric power supply unit 90 so that the temperature of the electric heater layer 16B becomes the set temperature. Further, the heat storage ECU 82 calculates the heat storage amount of the chemical heat storage material based on the temperature detected by the internal temperature sensor 88 and the current / voltage detected by the current voltage detection unit 94. Further, when the heat storage ECU 82 detects that the heat storage amount of the chemical heat storage material has reached the previously determined maximum heat storage amount (heat storage rate 100%), the heat storage ECU 82 determines that the heat storage has been completed. The power supply from 90 is stopped. Further, the heat storage ECU 82 closes the on-off valves 42 and 50 respectively, stops the refrigerant pump 56 and the cooler 54 of the condenser cooling system 58, and ends the heat storage mode.

  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 chemical heat storage system for a vehicle according to the first embodiment, the current supplied to the electric heater layer and the applied voltage are detected, and the temperature of the electric heater layer is detected. By calculating the amount of heat stored in the reactor based on the detected current and voltage, and the detected temperature, the amount of stored heat can be accurately calculated when electrical energy is converted into heat and stored. . Moreover, energy can be used effectively by preventing excessive power supply to the electric heater that supplies heat to the chemical heat storage material based on the calculated heat storage amount.

(Second Embodiment)
A vehicular chemical heat storage system 10 according to a second embodiment of the present invention will be described with reference to FIGS. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 7 is a schematic system configuration diagram showing a control configuration for the reactor 16 of the chemical heat storage system 10 for a vehicle. As shown in this figure, the chemical heat storage system for a vehicle 10 according to the second embodiment has a chemical heat storage system for a vehicle according to the first embodiment in that an internal temperature sensor is not provided in the reactor 16. Different from the system 10.

Further, as shown in FIG. 8, the current / voltage detector 294 is a four-wire system in which the electric heater (heater electric resistance) of the electric heater layer 16B is connected by four conductive wires. As a result, when the heater electrical resistance (Rh) is small, the conductor resistance (R _L ) is at a level that cannot be ignored. Therefore, the detection accuracy can be improved by canceling and eliminating the conductor resistance R _L using a 4-wire system. Can do.

As shown in FIG. 9, the heat storage ECU 82 includes the current and voltage detected by the current / voltage detector 94, the resistance temperature coefficient α [1 / K] of the heater material of the electric heater layer 16 </ b> B determined in advance, and the electric resistivity. Based on ρ ₀ [Ωm] and the shape of the heater wire (cross-sectional area A [m 2], length L [m]), the internal temperature T _d of the electric heater layer 16B is calculated according to the following equation (3). Then, it is output to the electric energy control unit 92.

However, ρ _o [Ωm] is a predetermined electrical resistivity of the heater material of the electric heater layer 16B, and α [1 / K] is a predetermined temperature coefficient of resistance of the heater material of the electric heater layer 16B. is there. A [m ² ] is a resistance cross-sectional area of the heater wire of the electric heater layer 16B obtained in advance, and L [m] is a resistance length of the heater wire of the electric heater layer 16B obtained in advance. T ₀ [° C.] is a predetermined reference temperature.

  The power amount control unit 92 outputs a control signal based on a deviation ε (= Ts−Td) between the temperature Td calculated by the heat storage ECU 82 and a preset temperature Ts to the power supply unit 90. The amount of power supplied from the power supply unit 90 is controlled.

  Further, the heat storage ECU 82 calculates the amount of heat stored in the reactor 16 according to the above formulas (1) and (2) based on the current and voltage detected by the current / voltage detection unit 94 and the calculated temperature Td. .

  In addition, about the other structure and effect | action of the chemical heat storage system 10 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 chemical heat storage system for a vehicle according to the second embodiment, the temperature sensor is installed in the reactor in order to calculate the temperature of the electric heater layer based on the detected current and voltage. The amount of heat storage can be calculated without installing.

  In the above embodiment, the case where the current / voltage detection unit is connected to the electric heater by a four-wire type is described as an example. However, when the resistance of the electric heater is large, the resistance of the conductive wire can be ignored. You may make it connect a voltage detection part with an electric heater by a two-wire system.

(Third embodiment)

  A vehicular chemical heat storage system 10 according to a third embodiment of the present invention will be described with reference to FIGS. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 10 is a schematic system configuration diagram showing a control configuration for the reactor 16 of the vehicular chemical heat storage system 10. As shown in this figure, the vehicular chemical heat storage system 10 relates to the first embodiment in that the internal temperature sensor is not installed in the reactor 16 and the power amount control unit is not provided. It differs from the chemical heat storage system 10 for vehicles.

The heat storage ECU 82 includes the current and voltage detected by the current / voltage detection unit 94, the resistance temperature coefficient α [1 / K] of the heater material of the electric heater layer 16B obtained in advance, the electrical resistivity ρ ₀ [Ωm], and Based on the shape of the heater wire (cross-sectional area A [m2], length L [m]), the internal temperature _Td of the electric heater layer 16B is calculated according to the above equation (3), and the electric energy control unit 92 Output to.

  The power supply unit 390 uses the power supplied from the power generation unit 22 to supply power to the electric heater of the electric heater layer 16B so as to have a constant voltage. When power is not supplied from the power generation unit 22, power is not supplied from the power supply unit 390 to the electric heaters of the electric heater layer 16B.

  Here, the principle of controlling the amount of electric power to the electric heater layer 16B in the present embodiment will be described.

  Assuming that the power supply of the power supply unit 390 is supplied at a constant voltage and does not have a power amount control unit, as shown in FIGS. 11 and 12, after heat storage is completed, the balance between heat generation and heat absorption is reduced by decreasing the heat absorption term Qs. The heater temperature rises as it collapses. As the heater temperature rises, the electrical resistance increases, so the amount of power supplied is suppressed when supplying a constant voltage, the balance between heat generation and heat absorption after dehydration is restored, and overheating of the heater temperature can be suppressed. Become. As a result, the power supply unit 390 with a constant voltage has a protection function for preventing the excessive temperature rise of the heater after completion of dehydration, so that the chemical heat storage material can be dehydrated without having an electric energy control unit.

  In addition, about the other structure and effect | action of the chemical thermal storage system 10 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 chemical heat storage system for a vehicle according to the third embodiment, it is possible to prevent overheating of the electric heater by the current suppressing function of the electric heater without having a power control means. .

  Moreover, in said 1st Embodiment-3rd Embodiment, although the case where this invention was applied to the chemical thermal storage system for vehicles was demonstrated to the example, it is not limited to this, Other than a vehicle You may make it apply this invention to the chemical heat storage system mounted.

  Further, the case where an electric heater is used as the energy conversion unit has been described as an example, but the present invention is not limited to this, and any energy conversion unit other than the electric heater can be used as long as the electric energy can be converted into heat. May be.

  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.

DESCRIPTION OF SYMBOLS 10 Vehicle chemical heat storage system 12 Container 16 Reactor 16A Heat storage layer 16B Electric heater layer 16C Vapor diffusion layer 22 Power generation part 30 Evaporator / condenser 82 Heat storage ECU
88 Internal temperature sensor 90 Power supply unit 90, 390 Power supply unit 92 Power amount control unit 94, 294 Current voltage detection unit

Claims (6)

A reactor in which an energy conversion unit that converts electricity into heat, a chemical heat storage material that stores heat by performing a dehydration reaction by supplying heat from the energy conversion unit, and dissipates heat by a 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 power supply unit for supplying power to the energy conversion unit;
A current-voltage detection unit that detects a current supplied from the power supply unit to the energy conversion unit and an applied voltage;
A temperature detector for detecting the temperature of the energy converter;
Based on the temperature detected by the temperature detection unit, a power amount control unit that controls the amount of power supplied from the power supply unit;
Based on the current and voltage detected by the current / voltage detector, and the temperature detected by the temperature detector, a heat storage amount calculator that calculates the heat storage amount of the reactor;
Including chemical heat storage system. An energy conversion unit that converts electricity into heat, and a reactor in which a chemical heat storage material that stores heat by performing a dehydration reaction by supplying heat from the energy conversion unit and dissipates heat by a 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 power supply unit that supplies power to the energy conversion unit so as to have a constant voltage;
A current-voltage detection unit that detects a current supplied from the power supply unit to the energy conversion unit and an applied voltage;
A temperature detector for detecting the temperature of the energy converter;
Based on the current and voltage detected by the current / voltage detector, and the temperature detected by the temperature detector, a heat storage amount calculator that calculates the heat storage amount of the reactor;
Including chemical heat storage system.   The heat storage amount calculation unit supplies the energy conversion unit based on the current and voltage detected by the current / voltage detection unit, the temperature detected by the temperature detection unit, and the heat capacity of the reactor obtained in advance. The chemical heat storage system according to claim 1 or 2, wherein the heat storage amount of the reactor is calculated according to a relationship among the total amount of electric power, a sensible heat change amount in the heat capacity, and a heat release amount.   The chemical heat storage system according to any one of claims 1 to 3, wherein the temperature detection unit calculates the temperature of the energy conversion unit based on the current and voltage detected by the current / voltage detection unit.   The temperature detection unit is based on the current and voltage detected by the current / voltage detection unit and the temperature coefficient of resistance, electrical resistivity, resistance cross-sectional area, and resistance length of the energy conversion unit obtained in advance. The chemical heat storage system of Claim 4 which calculates the temperature of an energy conversion part.   The chemical heat storage system according to any one of claims 1 to 5, wherein the power supply unit supplies power supplied from a drive unit mounted on a vehicle to the energy conversion unit.

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