JP2020079706A - Heat storage system and operation method of heat storage system - Google Patents

Abstract

To allow, in a heat storage system using an adsorbent as a heat storage material, application to a large scale district, a factory and an industrial part, which consume a large quantity of energy.SOLUTION: In a heat storage material filling tank 21, a heat storage material M comprised of an adsorbent is accommodated. In heat storage operation, outside air taken in by a fan 13 is heated by a heating coil 14 and is then supplied into the heat storage material filling tank 21. In heat release operation, the outside air taken in is supplied into the heat storage material filling tank 21, and high-temperature and low-humidity air after adsorption of moisture is supplied as supply air to a heat demander. A heat source of the heating coil 14 is solar heat, cogeneration waste heat, or industrial waste heat.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat storage system using an adsorbent and a method of operating the heat storage system.

  Since the Great East Japan Earthquake, stable power supply has become more and more important. Among various measures for stable power supply, promotion of the cogeneration system (CGS) is one of the practical measures. ing. However, at present, from an economical point of view, the introduction of CGS cannot be judged unless there is a stable heat demand corresponding to the device capacity, and even if the introduced CGS does not have heat demand, it will not operate. In some cases, the merit is lower than expected.

  Although a heat storage system is considered to be effective in improving the operating rate of CGS, the amount of heat stored in the commercially available latent heat storage material (PCM: Phase Change Material) is limited by the heat storage density (solidification latent heat of the latent heat storage material). There are problems of cost per unit and problems of utilization temperature and operation rate limited by the freezing point (melting point) of the latent heat storage material, and at present, no optimal heat storage system is found.

  Therefore, it has been proposed to store heat using an adsorbent such as zeolite instead of the latent heat storage material (Patent Document 1). This has an adsorbent capable of adsorbing an adsorbate in a container having an inlet and an outlet and releasing adsorption energy by adsorbing the adsorbate. The gas warmed by the adsorption energy in the container can be heated. It is designed to lead to the place to be warmed and is used in the heating system of automobiles.

Japanese Patent Publication No. 2015-516909

  However, the above-described conventional technique is applied to a limited space such as an automobile in the first place, and cannot be applied to a large amount of energy consumption, for example, a large area or a factory/industrial park.

  The present invention has been made in view of such a point, and in a heat storage system using an adsorbent as a heat storage material, it consumes a large amount of energy, and can be applied to, for example, a large-scale area or a factory/industrial park. The purpose is to do.

In order to achieve the above-mentioned object, the present invention has a container containing a heat storage material made of an adsorbent, a fan, and a heating unit for heating the outside air taken in by the fan, and heating by the heating unit. A heat storage system capable of supplying the air after having performed to the heat storage material in the housing by the fan,
During the heat storage operation, the air heated by the heating unit is supplied to the storage body to store heat therein, and during the heat radiation operation, the outside air taken in is supplied to the storage body and the moisture in the outside air is stored into the storage material. Is adsorbed, and the air after adsorbing the moisture is supplied to the heat demand destination as air supply.

According to the present invention, during the heat storage operation, the air heated by the heating unit is supplied to the container to store the heat by the heat storage in the container, and during the heat radiation operation, the outside air taken in is supplied to the container to store the heat. The material absorbs the moisture in the outside air, and the air after the moisture is adsorbed is supplied to the heat demand destination as air supply, so a large amount of energy is consumed, large-scale areas and factories It can be applied to industrial parks. That is, in the present invention, the heat source of the heating unit may be, for example, solar heat, warm exhaust heat (for example, cogeneration waste heat, factory waste heat, exhaust heat of steam from a building, so-called OA exhaust heat, or data center exhaust heat). Waste heat) etc. can be used. Therefore, it can be applied to large-scale areas, factories and industrial parks that consume large amounts of energy. On the other hand, the taken-in moisture in the outside air is directly adsorbed by the adsorbent and heated by the heat generated at that time, so that heat can be stored in a wide temperature range.
As the heating medium from the heat source for heating in the heating unit, either liquid or gas can be used. The temperature of heat used for heat storage (desorption) may be, for example, about 100°C. From the standpoint of model, the heating unit may employ, for example, a coil system that indirectly exchanges heat with a heating medium. For example, a heating coil, a water-air heat exchanger, an air-air heat exchanger, or the like can be used as necessary. A known heating unit can be used for the heating unit depending on the type of heating medium. Of course, an electric heater or an air heating method using a direct combustion method can also be adopted.

  In such a case, a heat exchanger for heating may be provided in the flow path for supplying the air as a supply air to a heat demand destination.

  Further, the operation method of the heat storage system of the present invention is characterized by controlling the air volume of the supply air supplied to the heat demand destination after the heat radiation operation is started.

  In such a case, the air flow rate of the supply air may be controlled by adjusting at least the opening degree of a damper provided in the flow path of the supply air supplied to a fan or a heat demand destination.

  According to still another aspect, in the method for operating the heat storage system of the present invention, after the heat radiation operation is started, a part of the supply air is merged with the outside air to control the temperature of the air supplied to the container. Is characterized by.

  In this case, the temperature of the air supplied to the container may be controlled by controlling the air volume of the supply air that joins with the outside air.

  The fan may be controlled together with the flow rate of the supply air to be merged with the outside air.

  According to the present invention, since hot exhaust heat or solar heat is used as the heat source of the heating unit, it is possible to apply the present invention to a large-scale area or a factory/industrial complex that consumes a large amount of energy.

It is explanatory drawing which showed typically the outline of a structure of the heat storage system concerning embodiment. It is an explanatory view showing the outline of the composition of the heat storage system concerning an embodiment at the time of heat dissipation operation typically. It is explanatory drawing which showed the outline of a structure of the experimental apparatus of a heat storage system typically. It is a graph which shows the time-dependent change of the temperature of each point of the heat storage material filling tank when heat storage operation is carried out using the experimental apparatus of FIG. It is a graph which shows the time-dependent change of the humidity etc. of each point of the heat storage material filling tank at the time of heat storage operation using the experimental apparatus of FIG. It is a graph which shows the time-dependent change of the temperature of each point of the heat storage material filling tank when heat-radiating operation is carried out with a large air volume using the experimental apparatus of FIG. It is a graph which shows the time-dependent change of the humidity etc. of each point of the heat storage material filling tank at the time of heat-radiating operation with a large air volume using the experimental apparatus of FIG. It is a graph which shows the time-dependent change of the temperature of each point of the heat storage material filling tank when heat-radiating operation is carried out with a small air volume using the experimental apparatus of FIG. It is a graph which shows the time-dependent change of the humidity etc. of each point of the heat storage material filling tank at the time of heat-radiating operation with a small air volume using the experimental apparatus of FIG. It is explanatory drawing which showed typically the outline of a structure of the heat storage system provided with the heat exchanger for suppressing the temperature fall of the supply air at the end of heat radiation operation. It is explanatory drawing which showed typically the outline of a structure of the other heat storage system provided with the heat exchanger for suppressing the temperature fall of the supply air at the end of heat radiation operation. It is explanatory drawing which showed typically the outline of a structure of the heat storage system provided with the inverter in order to suppress the temperature fall of the supply air at the end of heat radiation operation. 13 is a graph showing the relationship between the air supply temperature and the air flow rate when the air supply air volume control is performed by the heat storage system of FIG. It is explanatory drawing which showed typically the outline of the structure of the other heat storage system for implementing air supply air volume control in order to suppress the temperature fall of the air supply at the end of heat radiation operation. It is explanatory drawing which showed typically the outline of the structure of the other heat storage system for implementing recirculation air volume control in order to suppress the temperature fall of the supply air at the end of heat radiation operation. It is a graph which showed the time-dependent change of the air volume ratio when implementing the recirculation air volume control by the heat storage system of FIG. It is a graph which showed the time-dependent change of the entrance/exit temperature of the heat storage material filling tank when recirculating air volume control is implemented by the heat storage system of FIG. It is explanatory drawing which showed typically the outline of the structure of the other heat storage system for implementing recirculation air volume control in order to suppress the temperature fall of the supply air at the end of heat radiation operation.

  Hereinafter, an embodiment will be described. FIG. 1 shows an outline of a configuration of a heat storage system 1 according to the embodiment. This heat storage system 1 uses various types of heat generated by a dry adsorbent in an adsorbent filling tank. It is configured as a system that supplies high-temperature and low-humidity air to the drying process of the factory including the biomass factory, and has an air supply unit 11 and a heat storage material filling tank 21.

  In the heat storage material filling tank 21, the heat storage material M made of granules of an adsorbent is formed between the upper space 21b and the lower space 21c in the housing 21a by a member having ventilation, such as punching metal. It is filled and stored in the container.

  The air supply unit 11 has a fan 13 and a heating coil 14 as a heating unit inside a casing 12, and can heat the outside air introduced from an introduction flow path 15 formed by a duct or the like.

  A fluid heated by heat such as solar heat, cogeneration waste heat, and factory waste heat, for example, hot water or heated air is used for the heating coil 14. That is, the heat source of the heating coil 14 is solar heat, cogeneration waste heat, factory waste heat, or the like.

  The air sent out by the fan 13 can be supplied by switching to the upper space 21b and the lower space 21c in the heat storage material filling tank 21. That is, the supply passage 16 that is connected to the air supply unit 11 and that is configured by a duct or the like is branched into the first supply passage 17 and the second supply passage 18, and the first supply passage 17 and the second supply passage 17 are provided. The flow path 18 is connected to the upper space 21b and the lower space 21c in the heat storage material filling tank 21, respectively. Then, by opening/closing operations of dampers D2, D3, D4, and D5 described later, in the upper space 21b and the lower space 21c in the heat storage material filling tank 21, temperature-controlled outdoor air or other outside air (outside the system) Air) can be switched and supplied.

  The upper space 21b and the lower space 21c in the heat storage material filling tank 21 are connected to a first exhaust flow path 23 and a second exhaust flow path 24, which communicate with an exhaust path 22 constituted by a duct or the like. The exhaust passage 22 is an exhaust passage in the sense of being exhausted from the heat storage material filling tank 21, but functions as each passage of supply air to the load and return air in the later-described circulation use depending on the operation mode. That is, the exhaust passage 22 branches off from the sub-introduction passage 19 (return air passage during circulation use) connected to the air supply unit 11, and the exhaust passage 25 (outside the system) that exhausts to the outside of the system after branching. Exhaust path to). The exhaust passage 22 is connected to a high-temperature low-humidity air supply passage 26 (an air supply passage to a load) that is connected to a consumer, which is one form of a heat demand destination, for example. Each of the above flow paths is configured by, for example, a duct or the like. In the present embodiment, the term "customer" is used because it is also assumed that hot air can be directly supplied to unit customers such as dwelling units and facilities in district heat supply.

  The supply path 16 is provided with a first hygrometer 31 and a first thermometer 32, and the humidity and temperature of the air flowing through the supply path 16 are measured. A second hygrometer 33 and a second thermometer 34 are provided in the exhaust passage 22, and the humidity and temperature of the air flowing in the exhaust passage 22 are measured.

  A damper D1 is provided in the introduction flow path 15, a first supply flow path 17 branched from the supply path 16 and dampers D2 and D3 are provided in the second supply flow path 18, respectively. The exhaust passage 23 and the second exhaust passage 24 are provided with dampers D4 and D5, respectively, the auxiliary introduction passage 19 is provided with a damper D6, and the exhaust passage 25 is provided with a damper D7. A damper D8 is provided in the airway 26.

  The heat storage system 1 according to the embodiment is configured as described above. First, during heat storage operation, as shown in FIG. 1, the dampers D1, D3, D4, D7 are open and the dampers D2, D5, D6 and D8 are closed. Then, the outside air taken in from the introduction flow path 15 by the fan 13 is heated by the heating coil 14 and is supplied from the supply path 16 to the lower space 21c in the heat storage material filling tank 21 via the second supply flow path 18. , The heat storage material M is heated. As a result, the heat storage material M made of the adsorbent granules is dried.

  During such heat storage operation, unused waste heat is introduced into the heating coil 14 as a heating medium. In this case, if the exhaust heat is exhaust, it may be used as it is. The heating coil 14 itself may employ an air-to-air heat exchanger. When the waste heat to be used is discharged as a liquid, the hot water of the waste heat can be directly used by adopting the water-to-air heat exchanger. Alternatively, a heat exchanger may be provided on the side of the exhaust heat source to indirectly send the heat medium (for example, hot water) after exchanging heat to the water-to-air heat exchanger.

  The air after being used for drying the heat storage material M is exhausted from the upper space 21b in the heat storage material filling tank 21 to the outside of the system through the first exhaust flow path 23, the exhaust path 22, and the exhaust path 25. To be done. Through this operation, moisture is desorbed from the adsorbent granules constituting the heat storage material M, while heat is stored.

  When supplying high-temperature and low-humidity air to the drying process of the factories including the above-mentioned various biomass factories, it switches to heat radiation operation. That is, as shown in FIG. 2, the dampers D1, D2, D5 and D8 are opened and the dampers D3, D4, D6 and D7 are closed. Further, the supply of the heating medium to the heating coil 14 is stopped. The outside air taken in from the introduction flow path 15 by the fan 13 is supplied from the supply path 16 through the first supply flow path 17 to the upper space 21b in the heat storage material filling tank 21. Then, the moisture in the outside air is adsorbed by the adsorbent that constitutes the heat storage material M. At this time, heat is generated, whereby the adsorbent of the heat storage material M adsorbs moisture and is heated, and the air whose temperature is also raised by the heat stored in the heat storage material M is stored in the heat storage material filling tank 21. From the lower space 21c of the second exhaust flow path 24, the exhaust path 22 to the high temperature and low humidity air supply path 26, and the air of high temperature and low humidity for various biomass factories that are consumers and the drying process of the factory. Can be supplied. The heat storage system 1 shown in FIG. 1 and FIG. 2 uses the introduction flow path 15 and the supply path 16 in both the heat storage operation and the heat dissipation operation in order to save the amount of ducts. The outside air is supplied into the heat storage material filling tank 21 from the second supply flow path 18, but it is not necessary to pass through the heating coil 14 during the heat radiation operation, and therefore, for example, the first supply flow path 17 and the second supply flow path are provided. An external air intake duct may be separately connected to the passage 18 so that the external air from the external air intake duct is directly supplied to the heat storage material filling tank 21.

  As described above, according to the heat storage system 1 according to the present embodiment, heat from solar heat, cogeneration waste heat, factory waste heat, and the like is used to generate high-temperature and low-humidity air at various energy plants with low energy cost. Initially, it can be supplied to the drying process of the factory.

  As described above, when performing the heat storage operation and the heat radiation operation, for example, the heat storage operation may be performed at night and the heat radiation operation may be performed at daytime. Further, when the heat storage operation is performed again after the heat radiation operation, the heat can be efficiently stored even if the heat radiation is not completed.

  In the above embodiment, a granulated adsorbent is used as the heat storage material M. A known adsorbent such as silica gel or zeolite can be used as the adsorbent, and a granule of the adsorbent having desired properties such as ventilation resistance and heat/mass transfer can be used as the heat storage material. .. For example, a composite of amorphous aluminum silicate and low crystalline clay, such as Hasclay (registered trademark) or a low-temperature regenerated adsorbent of a polymer sorbent, can be used as a conventional adsorbent (such as silica gel or zeolite). In comparison, since it can adsorb water vapor in a wide range of humidity, it can be a high-density heat storage material.

  By the way, in the heat radiation operation for obtaining the high temperature and low humidity air as the air supply shown in FIG. 2, the heat storage material M (adsorbent granulation body) near the inlet of the heat storage material filling tank 21, that is, the upper space 21b is supplied. The moisture of the wet air (outside air) is adsorbed and generates heat to raise the temperature of the ventilated air, but the heat storage material M that adsorbs and generates heat with time of the heat radiation operation is the upper space that is the inlet portion of the air. From 21b, it moves to the lower space 21c near the exit portion. Then, at the end of the heat radiation operation, the amount of the heat storage material M that adsorbs and heats moisture (the area of moisture adsorption/heat generation in the heat storage material filling tank 21) decreases, so that the second exhaust gas at the outlet of the heat storage material filling tank 21 The air temperature at the inlet of the flow path 24 gradually decreases.

  In order to verify this point, description will be made based on the experimental results of heat storage and heat radiation operation using the experimental apparatus 41 of FIG. The experimental apparatus 41 shown in FIG. 3 includes an air supply unit 42, a temperature adjustment/humidity adjustment unit 43, and a heat storage tank unit 44. The air supply unit 42 has an air supply fan 42a. The temperature control/humidity control unit 43 controls the dehumidifier 45 that dehumidifies the air supply from the air supply fan 42a, the flow rate controller 46 that adjusts the flow rate of the air supply after the dehumidification, and the air supply after the flow rate adjustment It has a humidifier 47 for humidifying via the damper D10 and a heater 48 for heating the supply air after humidification. The heating temperature of the heater 48 is controlled by the temperature instruction controller 50 based on the temperature detected by the temperature detector 49 installed on the downstream side. A humidity detector 51 is provided downstream of the temperature detector 49.

  The supply air heated by the heater 48 is sent to the lower space 52a of the heat storage material filling tank 52 of the heat storage tank portion 44 via the dampers D11 and D12. The heat storage material filling tank 52 accommodates therein a heat storage material made of an adsorbent. The air from the upper space 52b of the heat storage material filling tank 52 is exhausted to the outside of the system via the damper D13 and the flow rate controller 53. The heat storage material filling tank 52 has a cylindrical shape with a diameter of 98.6 mm and a height of 300 mm.

  The heat storage material filling tank 52 is provided with a temperature sensor Tin that detects the temperature in the lower space 52a, that is, the temperature of the inlet air, and a temperature sensor Tout that detects the temperature in the upper space 52b, that is, the temperature of the outlet air. There is. Further, temperature sensors T1 to T5 for sequentially measuring the temperature of the heat storage material accommodated in the heat storage material filling tank 52 in the height direction are provided at equal intervals in the vertical direction from the bottom.

  Using this experimental apparatus 41, the temperature and humidity at the entrance and exit of the heat storage material filling tank 52 during heat storage operation and heat radiation operation, as well as the entrance and exit temperature of the heat storage material filling tank 52 and the temperature at five points in the height direction were measured. The state inside the heat storage material filling tank was confirmed. A general-purpose "zeolite (13X) granulated product" was used as the heat storage material.

  The results of the heat storage operation when high temperature air of about 130° C. was supplied to the heat storage material filling tank 52 are shown in FIGS. 4 and 5. FIG. 4 shows the temperature change with time, and FIG. 5 shows the humidity change with time.

  As can be seen from FIG. 4, the inlet temperature of the heat storage material filling tank 52 increased from room temperature due to the influence of the heat capacity of the experimental device 41, and reached 120° C. approximately 0.2 hours after the start of operation. The temperature in the tank gradually rises from room temperature in the order close to the inlet (in the order of the temperature sensors T1 to T5), and the outlet temperature of the heat storage material filling tank 52 starts to rise about 0.7 hours after the start of operation and starts operation. About 2 hours after the start, the temperature reached 120°C. At this time, as shown in FIG. 5, the outlet relative humidity in the heat storage material charging tank 52 was almost 0% RH, the adsorbent in the heat storage material charging tank 52 was in a dry state, and the heat storage operation was completed.

  With the dry heat storage material filling tank 52 as an initial condition, two types of heat radiation operation (moisture adsorption operation) when normal temperature air of about 30° C./about 50% RH is supplied to the heat storage material filling tank 52 The results obtained will be explained. FIG. 6 shows the temperature change with time when the amount of air supplied to the heat storage material filling tank 52 is large (137 L/min), FIG. 7 shows the humidity change at that time, and FIG. FIG. 9 shows changes in temperature with time when heat dissipation operation is performed when the air volume is small (46 L/min), and FIG. 9 shows changes in humidity at that time.

  As shown in FIG. 6, first, the adsorbent at a location near the entrance (the location of the temperature sensor T1) in the tank adsorbs moisture, generates heat, and raises the temperature. Then, heat is sequentially generated in the order close to the inlet (in the order of the temperature sensors T1 to T5), and the temperature rises, and the outlet temperature (Tout) in the heat storage material charging tank 52 starts to rise rapidly about 0.2 hours after the start of operation. Reached over 70°C. Thereafter, the outlet temperature (Tout) in the heat storage material filling tank 52 decreases about 1 hour after the start of operation, and the outlet temperature (Tout) in the heat storage material filling tank 52 stores heat about 1.5 hours after the start of operation. The room temperature was equal to the inlet temperature (Tin) in the material filling tank 52, and the heat radiation operation was completed. After about 1.5 hours from the start of the operation, as shown in FIG. 7, the outlet relative humidity inside the heat storage material charging tank 52 rapidly increased to about 40% RH.

  Similarly, FIG. 8 shows the temperature change with time of the heat radiation operation in which the room temperature air of about 30° C./about 50% RH was supplied at about 46 L/min to the heat storage material filling tank, and FIG. 9 shows the humidity change with time. However, as shown in FIG. 8, first, the adsorbent at a location near the inlet of the heat storage material filling tank 52 (the location of the temperature sensor T1) adsorbs moisture to generate heat and the temperature rises. The temperature rises due to heat generation in the order close to the inlet (in the order of the temperature sensors T1 to T5), and the outlet temperature in the heat storage material filling tank 52 starts to rise sharply about 0.5 hour after the start of operation, and 70 Reached over ℃. After that, the outlet temperature in the heat storage material filling tank 52 decreases after about 3.6 hours after the start of operation, and the outlet temperature in the heat storage material filling tank 52 decreases after about 5.3 hours after the start of operation. The temperature became the same as the inlet temperature of the tank 52, and the heat radiation operation was completed.

  After about 4.3 hours after the start of operation, as shown in FIG. 9, the outlet relative humidity in the heat storage material charging tank 52 increased sharply, and about 40% RH after about 5.3 hours after the start of operation. ..

  Since the temperature difference between the room temperature air supplied to the heat storage material filling tank 52 and the 80° C. air supply which is the outlet temperature in the heat storage material filling tank 52 is 50 deg, the average air supply temperature decrease rate is calculated. Is 137 L/min (FIG. 6), 50/(1.5-1)·(1/60)=1.67 deg. /Min, and when the air volume is 46 L/min (FIG. 8), 50/(5.3-3.6)·(1/60)=0.49 deg. It was /min. The decreasing rate of the supply air temperature in FIG. 9 was 29% (0.49/1.67) of the decreasing rate in FIG. 7. The air volume in FIG. 8 is 34% (46/137) of the air volume in FIG.

  As shown in FIGS. 6 and 8, it was found that the supply air temperature gradually decreased at the end of the heat radiation operation regardless of the air volume. Therefore, when supplying high-temperature and low-humidity air to the drying process of various biomass factories and other factories, it is necessary to suppress the temperature decrease (increase in relative humidity) at the end of the heat radiation operation.

  When heat source equipment such as another heating heat exchanger or a boiler is connected in series to the heat storage system 1, for example, the user side adjusts the temperature and humidity of the high temperature and low humidity supply air to these heating heat exchangers. It can be performed with a heat source facility such as a boiler or a boiler.

  That is, in the case of supplying high-temperature and low-humidity air, in order to prevent the temperature from decreasing at the end of the heat radiation operation, for example, as shown in FIG. The temperature decrease may be compensated for by exchanging heat between steam or hot water (not shown) and the supply air flowing through the high temperature and low humidity supply air passage 26. In this case, for example, as shown in FIG. 10, a temperature detector 62 is provided in the high-temperature low-humidity air supply passage 26 on the downstream side of the heat exchanger 61, and heat exchange is completed based on the detection value of the temperature detector 62. The opening/closing of the valve 64 provided on the return pipe 63 returning to the boiler (not shown) may be controlled.

  Further, in the case of supplying high-temperature and low-humidity air, in order to prevent the temperature from decreasing and adjust the humidity at the end of the heat radiation operation, for example, as shown in FIG. In addition, a humidity detector 65 is provided, and steam from a boiler (not shown) is introduced upstream of the heat exchanger 61 through a branch pipe 67 branched from a forward pipe 66 heading for the heat exchanger 61. Good. In this case, the opening/closing of the valve 68 provided in the branch pipe 67 may be controlled based on the detection value of the humidity detector 65.

  The examples shown in FIGS. 10 and 11 are examples in which the heat exchanger 61 is added to the heat storage system 1, but when the heat storage system 1 is installed alone or in parallel with other heat source equipment. In addition, the heat storage system 1 itself can prevent the temperature and humidity from decreasing at the end of such heat radiation operation.

  FIG. 12 shows an example in which the rotation speed of the fan 13 is controlled by the inverter 71 to control the supply air volume. In this case, when the outlet temperature of the heat storage material filling tank 21 decreases, the rotation speed of the fan 13 is decreased by the inverter 71 to decrease the supply air volume. Since this temperature drop is due to a decrease in the amount of moisture adsorbed, it is possible to control by increasing the humidity instead of the temperature, but in general a hygrometer is more expensive than a thermometer, so it is better to control by temperature. Is economical. The effect of suppressing the decrease in the outlet temperature of the heat storage material filling tank 21 by such temperature control of the supply air will be described based on FIG.

  First, the state of the heat dissipation operation of FIG. 6 described above is shown as Case 1 of FIG. In FIG. 13, the upper diagram shows the change over time of the inlet/outlet temperature of the heat storage material filling tank 21, and the lower diagram shows the change over time of the air volume (air volume ratio when the air volume in FIG. 6 is 100%). As shown in FIG. 13, in Case 1, the outlet temperature decreased about 1 hour after the start of operation, and the outlet temperature became equal to the inlet temperature about 2 hours after the start of operation. At about 1 hour after the start of operation, in the case of Case 2 in which the air volume was reduced to 34%, from the experimental result of FIG. 8 described above, the outlet temperature of about 80° C. was maintained until about 2 hours after the start of operation. It can be estimated that it can be maintained. In the case of Case 3 in which the air volume was gradually reduced to 34% (air volume was controlled by the outlet temperature) from approximately 1 hour after the start of operation to approximately 1.2 hours after the operation, Case 2 was about the same. However, it can be estimated that the outlet temperature can be maintained for a longer time than Case 1.

  From these things, it is possible to maintain the supply air temperature by reducing the supply air volume after the start of the heat radiation operation. However, although the supply air volume itself decreases, depending on the customer, for example, when the customer needs high-temperature and low-humidity air supply in order to perform a certain drying process, the throughput of the dry matter decreases in the evening. At that time, the air volume is effective at least when the initial high temperature and low humidity air supply is required.

  The example shown in FIG. 12 employs a method in which the rotation speed of the fan 13 is adjusted by the inverter 71 to control the supply air volume, but not the inverter control, but as shown in FIG. You may make it control the opening degree of the damper D8 provided in the high temperature and low humidity air supply flow path 26 based on the temperature and humidity of the air of the exit of the heat storage material filling tank 21. By directly controlling the opening degree of the damper D8 provided in the high-temperature low-humidity air supply passage 26 as described above, it is possible to control the air volume of the high-temperature low-humidity air supply.

  Instead of such control of the supply air amount, the recirculation supply control as described below can also suppress the decrease in the supply air temperature and humidity at the end of the heat radiation operation.

  The heat storage system 1 using the adsorbent described in the embodiment can be considered as a heat pump system. That is, since the temperature increase on the right axis in the upper diagram of FIG. 13 described above is an action of the heat pump, if the inlet temperature of the heat storage material filling tank 21 can be increased, the temperature and humidity are supplied to the high temperature and low humidity air supply passage 26. The temperature of supply air can be maintained at a high temperature.

  Therefore, as shown in FIG. 15, part of the air supply supplied to the high temperature and low humidity air supply passage 26 is returned from the air supply unit 11 to the heat storage material filling tank 21, and the high temperature and low humidity air from the heat storage material filling tank 21 is supplied. By recirculating, the inlet temperature of the heat storage material filling tank 21 can be raised, and thereby the temperature and humidity of the high temperature and low humidity supply air supplied through the high temperature and low humidity supply air passage 26 can be controlled.

  That is, in the example shown in FIG. 15, a second temperature detector 34 that measures the temperature of the air at the outlet of the heat storage material filling tank 21, and a second humidity detection that measures the humidity of the air at the outlet of the heat storage material filling tank 21. The opening degree of the damper D8 provided in the high-temperature low-humidity air supply passage 26 and the opening degree of the damper D6 provided in the high-temperature low-humidity air sub-introduction passage 19 of the high-temperature low-humidity air supply unit 11 are determined based on the detection value of the container 33. It is designed to be controlled.

  Such control will be described with reference to FIGS. 16 and 17. FIG. 16 shows changes in the recirculation air flow rate and the supply air flow rate, and FIG. 17 shows changes in the inlet and outlet air of the heat storage material filling tank 21 at that time. Is represented.

  As shown in FIG. 16, when one hour has passed after the operating time, the recirculation flow rate, which was 0% until then, is gradually increased, and as shown in FIG. The temperature Tin rises, whereby the outlet temperature Tout of the heat storage material filling tank 21 is maintained at about 80°C. However, as the recirculation flow rate increases, the amount of supply air supplied through the high temperature and low humidity supply air passage 26 decreases.

  In order to control the recirculation air supply by adjusting the opening degree of the damper as described above, as shown in FIG. 18, air supply air volume control by the inverter 71 of the fan 13 may be further added.

  In the example shown in FIG. 18, a second temperature detector 34 that measures the temperature of the air at the outlet of the heat storage material filling tank 21, and a second humidity detector that measures the humidity of the air at the outlet of the heat storage material filling tank 21. Based on the detected value of 33, the opening degree of the damper D6 provided in the auxiliary introduction flow path 19 for the high temperature and low humidity air of the high temperature and low humidity air supply unit 11 is controlled, and the second temperature detector 34 and the second humidity are controlled. Based on the detection value of the detector 33, the inverter 71 is controlled to control the air volume of the fan 13. This enables more realistic operation with a wider control range.

  As described above, in the recirculation air supply control shown in FIGS. 15 and 18, it is possible to control the temperature and humidity of the high temperature and low humidity air supply by the inlet temperature of the heat storage material filling tank 21. This is not a mere heat exchanger, but a heat storage material made of an adsorbent housed in the heat storage material filling tank 21 is a method that can be controlled because an exothermic reaction is caused by the supply of outside air containing water, This is a unique control method for a heat storage system that uses an adsorbent.

  As can be seen from the above embodiments, the present invention utilizes heat from factory waste heat, solar heat, and heat pump waste heat to heat and store heat of a heat storage material made of an adsorbent, when used in a consumer's house. In other words, during heat dissipation operation, by supplying outside air containing moisture to the heat storage material, the accumulated heat and the heat generated when the adsorbent adsorbs moisture provide high temperature and low humidity supply air to the customer, etc. It is possible to supply it first.

  In the home and business sector, which occupy a large percentage of Japan's energy demand today, we have made great strides toward the realization of “ZEB (Net Zero Energy Building)” and “ZEH (Net Zero Energy House)”. Energy saving is required. Therefore, we assumed the deployment of a large-scale regional heat network (hereinafter referred to as "megastock") that regenerates heating and cooling heat sources from CGS waste heat, factory waste heat, solar heat, and heat pump waste heat in urban areas and factories and industrial parks. In this case, by adopting the present invention, the heat consumption from outside the air conditioning system can be used to bring the energy consumption (power/gas consumption) of the air conditioning system to as close to zero as possible, which can contribute to the realization of ZEB and ZEH. ..

  In addition, the megastock utilizing the present invention uses the waste heat of each place that has not been used conventionally for drying the adsorbent, and supplies it by applying it to the air conditioning technology using the adsorbent on the user side that requires cold and hot heat. You can Furthermore, it is considered that the future ESP (Energy Service Provider) will be based on the best mix of gas/electricity/renewable energy, but the megastock using the present invention is the Key Technology as the Key Technology, and is used in the consumer/business industry. Enables "hard +ESP type or management contract type" business development.

  INDUSTRIAL APPLICABILITY The present invention is useful for air conditioning that utilizes waste heat in large-scale areas, factories and industrial parks.

1 Heat Storage System 11 Air Supply Unit 12 Casing 13 Fan 14 Heating Coil 15 Inlet Channel 16 Supply Channel 17 First Supply Channel 18 Second Supply Channel 19 Sub-Introduction Channel 21 Heat Storage Material Filling Tank 21a Housing 21b Upper Space 21c Lower space 22, 25 Exhaust passage 23 First exhaust passage 24 Second exhaust passage 26 High temperature and low humidity air supply passage 31 First hygrometer 32 First thermometer 33 Second hygrometer 34 Second thermometer 41 Experimental device D1 to D8, D10 to D13 Damper M Heat storage material

Claims (7)

An accommodating body accommodating a heat storage material made of an adsorbent, a fan, and a heating unit for heating the outside air taken in by the fan, and the air after being heated by the heating unit is accommodated by the fan. A heat storage system capable of supplying heat storage material in the body,
During the heat storage operation, the air heated by the heating unit is supplied to the container to store heat in the heat storage material,
During heat dissipation operation, the outside air taken in is supplied to the container to adsorb the moisture in the outside air by the heat storage material, and the air after the moisture is adsorbed is supplied to the heat demand destination as the supply air. A heat storage system that is characterized by The heat storage system according to claim 1, wherein a heat exchanger for heating is provided in a flow path for supplying heat to a destination of heat as supply air. A method of operating the heat storage system according to claim 1, wherein
A method for operating a heat storage system, comprising controlling the amount of supply air supplied to a heat demand destination after starting the heat radiation operation. The air flow rate of the supply air is controlled by adjusting an opening degree of a damper provided in at least a fan or a supply air flow path supplied to a heat demand destination. How to operate the heat storage system. A method of operating the heat storage system according to claim 1, wherein
After the start of the heat radiation operation, a part of the supply air is merged with the outside air to control the temperature of the air supplied to the container. The method of operating the heat storage system according to claim 5, wherein the temperature of the air supplied to the container is controlled by controlling the air volume of the supply air that joins with the outside air. The method for operating the heat storage system according to claim 6, wherein the fan is controlled together with the flow rate of the supply air to be merged with the outside air.

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