Thermochemical energy storage air conditioning system and using method

Abstract

The invention relates to the technical field of heating ventilation air conditioners, in particular to a thermochemical energy storage air conditioning system and a using method. In the heat charging process, ambient air is pressurized by a frequency conversion fan, is heated to a proper temperature by a preheating heat exchanger and a heater, flows into a thermochemical energy storage packed bed, stores heat energy carried by the ambient air as thermochemical energy, and is discharged to the environment after waste heat utilization by the preheating heat exchanger; in the heat release process, saturated air which is pressurized and humidified through the frequency conversion fan and the humidifier is mixed with the other stream of dry air which is heated and dehumidified after the reaction of the thermochemical energy storage packed bed, and the two streams flow into an air-conditioned room to supply heat after being mixed. The thermochemical energy storage technology is matched with an air conditioning system for use, waste heat or solar energy is stored for heating air, energy conservation and emission reduction are achieved, meanwhile, the effects of heavy-weight heat storage, ultra-low-loss cross-season long-term energy storage and flexible and stable heat utilization are achieved, and a new path is provided for heat supply regulation and control of the human settlement environment.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, ventilation and air conditioning, and in particular to a thermochemical energy storage air conditioning system and a use method thereof. Background Art

[0002] With the continuous development of economic level, the application of air conditioning system is more extensive and the demand is also increasing. However, the fossil energy such as coal, oil and natural gas in the world is becoming increasingly scarce and exhausted with the development of economy. my country is facing the serious environmental pollution caused by the excessive consumption of fossil energy. Therefore, the development of new energy and renewable energy and the promotion of energy-saving and consumption-reducing air conditioning technology have become the key to the future development of the air conditioning field under the global energy crisis.

[0003] The existing new and renewable energy sources include solar energy, wind energy, hydropower, biomass energy, geothermal energy, ocean energy (including tidal energy, wave energy, etc.), nuclear energy, hydrogen energy and other types. They will not produce greenhouse gases such as carbon dioxide during use, which meets environmental protection requirements. Among them, solar energy resources are inexhaustible and provide the world with long-term and stable energy supply potential. At present, many patents have proposed air conditioning systems and methods of use, such as the patent "A calcium hydroxide fluidized thermochemical energy storage system and method (CN202411153899.0)" by evenly arranging the heating surface in the fluidized bed reactor and the external heat exchange bed, using the fluidized material for heat exchange, using steam as the only vulcanizing agent and reactant, and setting a water tank at the same time. While achieving full utilization of heat, it ensures the purity of the reactant concentration and solves the problem of steam volume disorder in the energy storage and release process. The patent "A thermochemical energy storage system using a two-stage fluidized bed and its operation mode (CN202410932339.9)" sets up a carbon dioxide adsorption bed, an energy storage heat exchanger, an expander, a compressor, an energy release heat exchanger and other devices. When the power is sufficient, the system converts the electrical energy into the chemical energy of calcium oxide through a chemical reaction and stores it; when the power is tight, the system releases the chemical energy in the calcium oxide through a two-stage chemical reaction, converts it into heat energy to drive the generator to generate electricity, thereby achieving long-term and cross-distance energy storage and reducing the activation energy of energy release. The patent "A cascade ammonium bisulfate thermochemical energy storage system and energy storage heat release method (CN202410937803.3)" sets up a heat source, a heat storage unit and a heat release unit. The heat storage unit absorbs heat from the heat source, decomposes the ammonium bisulfate in multiple steps, stores and transports the decomposition products to the heat release unit, resynthesizes the ammonium bisulfate and releases heat in multiple steps for utilization, thereby achieving efficient heat absorption.

[0004] However, the production and use of new energy sources often have mismatches in time and space. For example, renewable energy sources such as solar energy and wind energy have intermittent and volatile problems. They have the characteristics of intermittent heating during the heating process, which cannot make traditional solar medium and high temperature heat utilization systems work continuously. Thermochemical energy storage technology, as an energy storage technology, has the advantages of constant heat release, energy saving and environmental protection, high energy storage density, and long-term energy storage. Using this technology in conjunction with an air-conditioning system can not only achieve energy conservation and emission reduction, but also effectively alleviate the current situation of low utilization rate of low-grade energy, and achieve the effects of heavyweight heat storage, ultra-low loss cross-season long-term energy storage, and flexible and stable heat utilization. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a thermochemical energy storage air conditioning system and a method of use, which can improve energy utilization and promote energy conservation and emission reduction by recycling waste heat, valley electricity, waste heat or solar heat for a long time through the thermochemical energy storage system. Its low and medium temperature systems can be applied to the heat release process to achieve constant temperature and stable heat source, and innovatively combine it with the air conditioning system, which is conducive to improving the flexibility of air conditioning range and improving air quality.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A thermochemical energy storage air conditioning system includes a heat charging circuit and a heat releasing circuit:

[0008] The heat charging circuit includes a variable frequency fan, a first three-way valve, a preheating heat exchanger, a heater, a second three-way valve, a thermochemical energy storage packed bed and a third three-way valve;

[0009] The inlet end of the variable frequency fan is connected to the external environment, and the outlet end of the variable frequency fan is connected to the port A of the first three-way valve; the variable frequency fan plays a role in establishing wind pressure to overcome the resistance along the way;

[0010] The first inlet of the preheating heat exchanger is connected to the port B of the first three-way valve, and the first outlet of the preheating heat exchanger is connected to the inlet end of the heater; the second inlet of the preheating heat exchanger is connected to the port I of the third three-way valve, and the second outlet of the preheating heat exchanger is connected to the external environment; the preheating heat exchanger plays a role in recovering exhaust waste heat, thereby improving the thermal energy utilization efficiency of the system;

[0011] The outlet end of the heater is connected to the port F of the second three-way valve; the heater transfers heat to the air;

[0012] The bottom inlet and outlet of the thermochemical energy storage packed bed is connected to the D port of the second three-way valve, and the top inlet and outlet of the thermochemical energy storage packed bed is connected to the H port of the third three-way valve; the thermochemical energy storage packed bed absorbs the heat in the air and stores it in the form of chemical energy;

[0013] The heat release circuit includes a variable frequency fan, a first three-way valve, a humidifier, a third three-way valve, a thermochemical energy storage filling bed, an air-conditioned room, a first control valve, a temperature and humidity sensor control system, and a bypass pipeline;

[0014] The air inlet end of the humidifier is connected to the C port of the first three-way valve, and the air outlet end of the humidifier is connected to the J port of the third three-way valve;

[0015] The top inlet and outlet of the thermochemical energy storage packed bed is connected to the H port of the third three-way valve, and the bottom inlet and outlet of the thermochemical energy storage packed bed is connected to the D port of the second three-way valve; the thermochemical energy storage packed bed absorbs moisture in the air to produce a chemical reaction, thereby heating the bed body and the air, and the air carries the heat out of the bed body; the E port of the second three-way valve is connected to the inlet of the air-conditioned room, and the hot and humid air is sent to the air-conditioned area;

[0016] The air-conditioned room is equipped with a temperature and humidity sensor control system, which adjusts the opening of the first control valve through feedback from temperature and humidity monitoring data, so that part of the air with 100% relative humidity flows through the bypass pipeline and then merges with the dry air at the bottom inlet and outlet of the thermochemical energy storage filling bed to achieve the purpose of specifying the air conditioning air supply parameters.

[0017] By adopting the above technical solution: when storing heat, the system stores the supplied heat energy in the form of chemical energy in the thermochemical energy storage filling bed; when releasing heat, the humid air flows through the thermochemical energy storage filling bed, absorbs the heat released by its chemical reaction, and directly provides air-conditioned air with suitable temperature and humidity to the user end.

[0018] Furthermore, the heater is a pipe heater, which may be a solar heater, an electric heater, a gas heater or a boiler heat source heater, etc. The energy source may be solar heat, industrial waste heat, grid valley electricity, etc.; the heater may have a built-in dryer to ensure that the outlet air is high-temperature dry air (or close to it).

[0019] Furthermore, the thermochemical energy storage packed bed comprises a thermochemical energy storage material module, a mechanical partition, a metal liner, a current divider, a filter and an outer protective insulation structure;

[0020] The outer protective insulation structure is tightly wrapped around the outside of the metal liner to reduce heat loss; a hollow cylindrical cavity is formed inside the metal liner, and a thermochemical energy storage material module is wrapped inside the metal liner to bear pressure and seal; the distributor is located at the upper and lower ends of the metal liner to evenly distribute the fluid at the inlet and outlet of the packed bed; the filter is installed in the fluid channel inside the packed bed, close to the distributor and the mechanical partition, to filter impurities, and the filter includes a wire mesh filter, a sintered metal filter, a ceramic filter and a polymer filter; the upper and lower end surfaces of the mechanical partition directly contact the thermochemical energy storage material module, wherein the bottom mechanical partition supports the thermochemical energy storage material module, and the top mechanical partition covers the top of the thermochemical energy storage material module, and the bottom mechanical partition and the top mechanical partition are fixed to the metal liner by bolts, connecting rods or welding to support and fix the energy storage material. During actual application, mechanical partitions can be added inside the thermochemical energy storage material module according to the needs of flow channel optimization; the thermochemical energy storage material module is placed in the central area inside the metal liner cavity, and is stacked by thermochemical energy storage materials, including honeycomb, porous particles, layered stacking and composite stacking methods, and the energy storage material type is one or more of metal oxides, hydrated salts, hydroxides or ammonia compounds; the thermochemical energy storage material module can effectively contact dry / wet air through scientific stacking, thereby performing rapid heat and mass transfer, and the thermochemical energy storage material can be heated to the reaction temperature to precipitate the bound water therein, and once the material is bound to water, a chemical reaction can occur to release heat.

[0021] Furthermore, the temperature and humidity sensor control system can monitor the temperature and humidity of the air supply point and the temperature and humidity of the air-conditioned room in real time, and perform feedback adjustment of the first control valve through built-in program calculation to control the temperature and humidity of the air supply state point within a specified range to ensure the comfort of the air-conditioned room.

[0022] Furthermore, the heat charging circuit and the heat releasing circuit share a variable frequency fan, and the air flow of different system cycles is controlled by variable frequency regulation to adapt to the variable operating environment, while saving costs and energy consumption.

[0023] Furthermore, the humidifier sprays and humidifies the circulating air through the variable frequency water pump circulation, so that the relative humidity of the outlet air is 100%; and a small circulating fan, electric auxiliary heating and water replenishment tank are built in, which can be started in extreme cases to increase the proportion of water vapor in the air.

[0024] The present invention also provides a method for using a thermochemical energy storage air conditioning system, including a heat charging process, a heat storage process, a heat release process, and a temperature and humidity feedback adjustment process;

[0025] The charging process: the ambient air is pressurized by the variable frequency fan and then flows through the preheating heat exchanger to be preheated, then flows through the heater to be heated to a suitable reaction temperature and then flows into the thermochemical energy storage packed bed, directly contacts the fillers in the packed bed, transfers its own heat energy to the fillers, and after flowing out of the thermochemical energy storage packed bed, the air flows through the preheating heat exchanger again to cool down and then part of it is discharged to the environment from the outlet;

[0026] The heat storage process: there is no heat transfer fluid in and out, the thermochemical energy storage bed itself dissipates part of the sensible heat energy to the outside through the outer protective structure, but because the heat energy is mainly stored in the form of chemical energy, as long as the reaction conditions are not met, the storage period of heat energy can reach several months or years;

[0027] The heat release process: air is pressurized by a variable frequency fan and then flows into a humidifier for purification and humidification. A portion of the air then flows through a thermochemical energy storage packed bed, directly contacts with fillers in the packed bed for thermochemical reaction, absorbs heat, increases temperature and reduces humidity, and then flows out of the thermochemical energy storage packed bed. Another portion of the air flows out through a bypass pipe, and the two flows are mixed and then flow into the air-conditioned room for heating.

[0028] The temperature and humidity feedback adjustment process: the sensing device of the temperature and humidity sensing control system monitors the temperature and humidity levels in the air-conditioned room in real time, and after comparing and calculating the actual data measured with the ideal temperature and humidity set values ​​in the electronic control element, generates a corresponding control signal to control the power of the variable frequency fan and the opening degree of the first control valve, thereby controlling the flow rate, flow rate and dry and wet airflow mixing ratio of the heat transfer fluid, and then adjusting the temperature and humidity of the air delivered to the air-conditioned room.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The long-term thermochemical energy storage air conditioning technology proposed in the present invention has high energy storage density and is flexible and stable. The heat storage density of thermochemical heat storage materials is generally about one order of magnitude higher than that of sensible heat and latent heat storage materials, and chemical heat storage materials can achieve long-term heat storage as long as the reaction between substances is isolated.

[0031] 2. The present invention adopts a real-time dynamic feedback adjustment method for temperature and humidity, so that the controlled room can maintain a comfortable thermal and humid environment, realize intelligent and energy-saving regulation, and improve the use efficiency of the thermochemical energy storage air-conditioning system.

[0032] 3. The present invention is environmentally friendly and has significant economic benefits. Salt hydrates, ammonia compounds, metal hydrides, etc. will not produce harmful substances or greenhouse gas emissions during the heat charging and heat release process, which is in line with the green and low-carbon development concept and helps promote sustainable development. At the same time, the heat source is waste heat or off-peak electricity, which is more energy-saving and consumption-reducing than traditional electric-driven air conditioners.

[0033] 4. The present invention has a simple and compact structure and low cost. The high heat storage density thermochemical energy storage packed bed is coupled with the air conditioning system integrated module, making the system more compact, which is particularly beneficial in application scenarios where storage space is limited or space cost is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 A schematic diagram of key nodes of a thermochemical energy storage air conditioning system in an embodiment of the present invention;

[0036] Figure 3 It is a schematic diagram of the structure of the thermochemical energy storage packed bed of the present invention.

[0037] In the figure: 1- variable frequency fan, 2- first three-way valve, 3- preheating heat exchanger, 4- heater, 5- second three-way valve, 6- thermochemical energy storage packed bed, 7- first control valve, 8- third three-way valve, 9- humidifier, 10- air-conditioned room, 11- temperature and humidity sensor control system, 12- bypass pipeline; 601- thermochemical energy storage material module, 602- mechanical partition, 603- filter, 604- current distributor, 605- metal liner, 606 external protective insulation structure. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0039] A thermochemical energy storage air conditioning system includes a heat charging circuit and a heat releasing circuit:

[0040] The heat charging circuit includes a variable frequency fan 1, a first three-way valve 2, a preheating heat exchanger 3, a heater 4, a second three-way valve 5, a thermochemical energy storage packed bed 6 and a third three-way valve 8;

[0041] The heat release circuit includes a variable frequency fan 1, a first three-way valve 2, a humidifier 9, a third three-way valve 8, a thermochemical energy storage filling bed 6, an air-conditioned room 10, a first control valve 7, a temperature and humidity sensor control system 11 and a bypass pipeline 12.

[0042] In this embodiment, when storing heat, the system stores the supplied heat energy in the form of chemical energy in a thermochemical energy storage bed; when releasing heat, humid air flows through the thermochemical energy storage bed, absorbs the heat released by its chemical reaction, and directly provides air-conditioned air with suitable temperature and humidity to the user end.

[0043] Specifically, the inlet end of the variable frequency fan 1 of the heat charging circuit is connected to the external environment, and the outlet end of the variable frequency fan 1 is connected to the A port of the first three-way valve 2; the variable frequency fan 1 plays a role in establishing wind pressure to overcome the resistance along the way.

[0044] The first inlet of the preheating heat exchanger 3 is connected to the port 2B of the first three-way valve, and the first outlet of the preheating heat exchanger 3 is connected to the inlet end of the heater 4; the second inlet of the preheating heat exchanger 3 is connected to the port 8I of the third three-way valve, and the second outlet of the preheating heat exchanger 3 is connected to the external environment; the preheating heat exchanger 3 plays a role in recovering exhaust waste heat, thereby improving the thermal energy utilization efficiency of the system.

[0045] The outlet end of the heater 4 is connected to the port F of the second three-way valve 5; the heater 4 transfers heat to the air.

[0046] The bottom inlet and outlet of the thermochemical energy storage filled bed 6 is connected to the second three-way valve 5D port, and the top inlet and outlet of the thermochemical energy storage filled bed 6 is connected to the third three-way valve 8H port; the thermochemical energy storage filled bed 6 absorbs heat in the air and stores it in the form of chemical energy.

[0047] Specifically, the inlet end of the variable frequency fan 1 of the heat release circuit is connected to the external environment, and the outlet end of the variable frequency fan 1 is connected to the A port of the first three-way valve 2; the variable frequency fan 1 plays a role in establishing wind pressure to overcome the resistance along the way.

[0048] The air inlet end of the humidifier 9 is connected to the C port of the first three-way valve 2, and the air outlet end of the humidifier 9 is connected to the J port of the third three-way valve 8.

[0049] The top inlet and outlet of the thermochemical energy storage filled bed 6 is connected to the third three-way valve 8H port, and the bottom inlet and outlet of the thermochemical energy storage filled bed 6 is connected to the second three-way valve 5D port; the thermochemical energy storage filled bed 6 absorbs moisture in the air to produce a chemical reaction, thereby heating the bed body and the air, and the air carries the heat out of the bed body; the second three-way valve 5E port is connected to the inlet of the air-conditioned room 10, and the hot and humid air is sent to the air-conditioned area.

[0050] The air-conditioned room 10 is provided with a temperature and humidity sensor control system 11, which adjusts the opening of the first control valve 7 through feedback of temperature and humidity monitoring data, so that part of the air with 100% relative humidity flows through the bypass pipe 12 and then merges with the dry air at the bottom inlet and outlet of the thermochemical energy storage filling bed 6 to achieve the purpose of specifying the air conditioning air supply parameters.

[0051] Specifically, the heater 4 is a pipe heater, which can be in the form of a solar heater, an electric heater, a gas heater or a boiler heat source heater, etc. The energy source can be solar heat, industrial waste heat, grid valley electricity, etc.; the heater 4 can have a built-in dryer to ensure that the outlet air is high-temperature dry air (or close to it).

[0052] Specifically, the thermochemical energy storage packed bed 6 includes a thermochemical energy storage material module 601, a mechanical partition 602, a metal liner 605, a current divider 604, a filter 603 and an outer protective insulation structure 606;

[0053] The outer protective insulation structure 606 is tightly wrapped around the outside of the metal liner 605 to reduce heat loss; the interior of the metal liner 605 forms a hollow cylindrical cavity, which wraps the thermochemical energy storage material module and plays a role in pressure bearing and sealing; the distributor 604 is located at the upper and lower ends of the metal liner 605 to evenly distribute the fluid at the inlet and outlet of the packed bed; the filter 603 is installed in the internal fluid channel of the packed bed, close to the distributor 604 and the mechanical partition 602, to filter impurities, and the filter 603 It includes forms such as metal mesh filters, sintered metal filters, ceramic filters and polymer filters; the upper and lower end surfaces of the mechanical partition 602 directly contact the thermochemical energy storage material module 601, wherein the bottom mechanical partition 602 supports the thermochemical energy storage material module 601, and the top mechanical partition 602 covers the top of the thermochemical energy storage material module 601, and the bottom mechanical partition 602 and the top mechanical partition 602 are fixed in the metal liner by bolts, connecting rods or welding, so as to support and fix the energy storage material. In actual application, a mechanical partition 602 can be added inside the thermochemical energy storage material module 601 according to the flow channel optimization requirements; the thermochemical energy storage material module 601 is placed in the central area inside the metal liner 605 cavity, and is stacked by thermochemical energy storage materials, including honeycomb, porous particles, layered stacking and composite stacking methods, and the energy storage material type is one or more of metal oxides, hydrated salts, hydroxides or ammonia compounds; the thermochemical energy storage material module can effectively contact dry / wet air through scientific stacking, thereby performing rapid heat and mass transfer, and the thermochemical energy storage material can be heated to the reaction temperature to precipitate the bound water therein, and once the material is bound to water, a chemical reaction can occur to release heat.

[0054] Specifically, the temperature and humidity sensor control system 11 can monitor the temperature and humidity of the air supply point and the temperature and humidity of the air-conditioned room in real time, calculate through the built-in program, and perform feedback adjustment of the first control valve to control the temperature and humidity of the air supply state point within a specified range to ensure the comfort of the air-conditioned room.

[0055] Specifically, the heat charging circuit and the heat releasing circuit share a variable frequency fan 1, and the air flow rates of different system cycles are controlled by variable frequency regulation to adapt to variable operating environments, while saving costs and energy consumption.

[0056] Specifically, the humidifier 9 plays the role of spraying and humidifying the circulating air through the variable frequency water pump circulation, so that the relative humidity of the outlet air is 100%; and has a built-in small circulation fan, electric auxiliary heating and water replenishment tank, which can be started in extreme cases to increase the proportion of water vapor in the air.

[0057] In some possible implementations, a method for using a thermochemical energy storage air conditioning system includes: a heat charging process, a heat storage process, a heat release process, and a temperature and humidity feedback adjustment process;

[0058] The charging process is as follows: the ambient air is pressurized by the variable frequency fan 1 and then flows through the preheating heat exchanger 3 to be preheated, then flows through the heater 4 to be heated to a suitable reaction temperature and then flows into the thermochemical energy storage packed bed 6, directly contacts the fillers in the packed bed, transfers its own heat energy to the fillers, and after flowing out of the thermochemical energy storage packed bed 6, the air flows through the preheating heat exchanger 3 again to be cooled and then part of it is discharged to the environment from the outlet.

[0059] In the heat storage process, there is no heat transfer fluid entering or exiting, and the thermochemical energy storage filling bed 6 itself dissipates part of the sensible heat energy to the outside through the outer protective structure. However, because the heat energy is mainly stored in the form of chemical energy, as long as the reaction conditions are not met, the heat energy storage period can reach several months or even years.

[0060] The heat release process is as follows: the air is pressurized by the variable frequency fan 1 and then flows into the humidifier 9 for purification and humidification. A part of the air then flows through the thermochemical energy storage packed bed 6, directly contacts with the fillers in the packed bed to undergo a thermochemical reaction, absorbs heat, increases temperature and reduces humidity, and then flows out of the thermochemical energy storage packed bed 6. The other part of the air flows out after passing through the bypass pipeline. The two streams are mixed and then flow into the air-conditioned room 10 for heating.

[0061] Temperature and humidity feedback adjustment process: The sensing device of the temperature and humidity sensing control system 11 monitors the temperature and humidity levels in the air-conditioned room 10 in real time. After comparing and calculating the actual data measured with the ideal temperature and humidity set values ​​in the electronic control element, a corresponding control signal is generated to control the power of the variable frequency fan 1 and the opening degree of the first control valve, thereby controlling the flow rate, flow rate and dry and wet air flow mixing ratio of the heat transfer fluid, and then adjusting the temperature and humidity of the air delivered to the air-conditioned room.

[0062] Example:

[0063] In a typical application scenario (Shijiazhuang City, winter heating), the heater uses a solar collector to heat the air, and the air supply state point parameters are temperature 18-22°C, relative humidity 40-60%, wind speed no more than 0.2m / s, and environmental parameters are winter outdoor calculated temperature -8°C. Table 1 shows the key node parameters of a thermochemical energy storage air conditioning system, with a heat supply of 22243kJ and a conversion efficiency of 88.41%. Due to the cross-seasonal storage advantage of thermochemical energy storage, this thermochemical energy storage air conditioning system can charge the system with heat in summer.

[0064] like Figure 2 As shown, state points ①~⑥ are heat storage process nodes, ⑦~ It is the node of the exothermic process.

[0065] Table 1 Key node parameters of thermochemical energy storage air conditioning system

[0066]

[0067] In summary, the present invention recovers and stores waste heat, valley electricity, waste heat or solar heat for a long time through a thermochemical energy storage system, thereby improving energy utilization and promoting energy conservation and emission reduction. Its low and medium temperature systems can be applied to the heat release process to achieve constant temperature and stable heat source, and innovatively combine with the air conditioning system to improve the flexibility of the air conditioning range and improve air quality.

[0068] The above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present invention, and these improvements and changes are also regarded as the protection scope of the present invention.

Claims

1. A thermochemical energy storage air conditioning system, characterized in that: Including heat charging circuit and heat releasing circuit: The heat charging circuit comprises a variable frequency fan (1), a first three-way valve (2), a preheating heat exchanger (3), a heater (4), a second three-way valve (5), a thermochemical energy storage packed bed (6) and a third three-way valve (8); The inlet end of the variable frequency fan (1) is connected to the external environment, and the outlet end of the variable frequency fan (1) is connected to the A port of the first three-way valve (2); the variable frequency fan (1) plays a role in establishing wind pressure to overcome the resistance along the way; The first inlet of the preheating heat exchanger (3) is connected to the B port of the first three-way valve (2), and the first outlet of the preheating heat exchanger (3) is connected to the inlet end of the heater (4); the second inlet of the preheating heat exchanger (3) is connected to the I port of the third three-way valve (8), and the second outlet of the preheating heat exchanger (3) is connected to the external environment; the preheating heat exchanger (3) plays a role in recovering exhaust waste heat, thereby improving the thermal energy utilization efficiency of the system; The outlet end of the heater (4) is connected to the F port of the second three-way valve (5); the heater (4) transfers heat to the air; The bottom inlet and outlet of the thermochemical energy storage packed bed (6) is connected to the D port of the second three-way valve (5), and the top inlet and outlet of the thermochemical energy storage packed bed (6) is connected to the H port of the third three-way valve (8); the thermochemical energy storage packed bed (6) absorbs heat in the air and stores it in the form of chemical energy; The heat release circuit comprises a variable frequency fan (1), a first three-way valve (2), a humidifier (9), a third three-way valve (8), a thermochemical energy storage packed bed (6), an air-conditioned room (10), a first control valve (7), a temperature and humidity sensor control system (11) and a bypass pipeline (12); The air inlet end of the humidifier (9) is connected to the C port of the first three-way valve (2), and the air outlet end of the humidifier (9) is connected to the J port of the third three-way valve (8); The top inlet and outlet of the thermochemical energy storage packed bed (6) is connected to the H port of the third three-way valve (8), and the bottom inlet and outlet of the thermochemical energy storage packed bed (6) is connected to the D port of the second three-way valve (5); the thermochemical energy storage packed bed (6) absorbs moisture in the air to generate a chemical reaction, thereby heating the bed body and the air, and the air carries the heat out of the bed body; the E port of the second three-way valve (5) is connected to the inlet of the air-conditioned room (10), so that the hot and humid air is sent to the air-conditioned area; The air-conditioned room (10) is provided with a temperature and humidity sensor control system (11), which adjusts the opening of the first control valve (7) through feedback of temperature and humidity monitoring data, so that part of the air with 100% relative humidity flows through the bypass pipeline (12) and then merges with the dry air at the bottom inlet and outlet of the thermochemical energy storage packed bed (6) to achieve the purpose of specifying the air conditioning air supply parameters.

2. A thermochemical energy storage air conditioning system according to claim 1, characterized in that: The heater (4) is a solar heater, an electric heater, a gas heater or a boiler heat source type heater, and the heater (4) may have a built-in dryer.

3. A thermochemical energy storage air conditioning system according to claim 1, characterized in that: The thermochemical energy storage packed bed (6) comprises a thermochemical energy storage material module (601), a mechanical partition (602), a metal liner (605), a current divider (604), a filter (603) and an outer protective insulation structure (606); The outer protective insulation structure (606) is tightly coated on the outside of the metal liner (605), the interior of the metal liner (605) forms a hollow cylindrical cavity, the interior of the metal liner (605) is wrapped with a thermochemical energy storage material module (601), and the current distributor (604) is located at the upper and lower ends of the metal liner (605) to evenly distribute the fluid at the inlet and outlet of the packed bed; The filter (603) is installed in the internal fluid channel of the packed bed, adjacent to the flow divider (604) and the mechanical partition (602). The upper and lower end surfaces of the mechanical partition (602) are in direct contact with the thermochemical energy storage material module (601). The thermochemical energy storage material module (601) is placed in the central area of ​​the metal liner (605) cavity and is stacked with thermochemical energy storage materials. The thermochemical energy storage material module can effectively contact with dry / wet air through stacking, thereby performing rapid heat and mass transfer.

4. A thermochemical energy storage air conditioning system according to claim 1, characterized in that: The temperature and humidity sensor control system (11) can monitor the temperature and humidity of the air supply point and the temperature and humidity of the air-conditioned room in real time, and perform feedback adjustment of the first control valve through built-in program calculation to control the temperature and humidity of the air supply state point within a specified range, thereby ensuring the comfort of the air-conditioned room.

5. A thermochemical energy storage air conditioning system according to claim 1, characterized in that: The heat charging circuit and the heat releasing circuit share a variable frequency fan (1), and the air flow rates of the different system cycles are controlled by variable frequency regulation.

6. A thermochemical energy storage air conditioning system according to claim 1, characterized in that: The humidifier (9) plays the role of spraying and humidifying the circulating air through the variable frequency water pump circulation, so that the relative humidity of the outlet air is 100%; and a small circulating fan, electric auxiliary heating and water supply tank are built in.

7. The method for using a thermochemical energy storage air conditioning system according to claim 1, characterized in that: Including heat charging process, heat storage process, heat release process and temperature and humidity feedback adjustment process; The heating process is as follows: the ambient air is pressurized by the variable frequency fan (1) and then flows through the preheating heat exchanger (3) to be preheated, then flows through the heater (4) to be heated to a suitable reaction temperature and then flows into the thermochemical energy storage packed bed (6), directly contacts the packing in the packed bed, transfers its own heat energy to the packing, and after flowing out of the thermochemical energy storage packed bed (6), the air flows through the preheating heat exchanger (3) again to be cooled and then partially discharged to the environment from the outlet; In the heat storage process, there is no heat transfer fluid entering or exiting, and the thermochemical energy storage filling bed (6) itself dissipates part of the sensible heat energy to the outside through the outer protective structure. However, since the heat energy is mainly stored in the form of chemical energy, the storage period of the heat energy can reach several months or even years as long as the reaction conditions are not met. The heat release process is as follows: air is pressurized by the variable frequency fan (1) and then flows into the humidifier (9) for purification and humidification; a portion of the air then flows through the thermochemical energy storage packed bed (6) and directly contacts with the fillers in the packed bed to undergo a thermochemical reaction, absorbs heat, increases temperature and reduces humidity, and then flows out of the thermochemical energy storage packed bed (6); another portion of the air flows out through a bypass pipeline, and the two flows are mixed and then flow into the air-conditioned room (10) for heating; The temperature and humidity feedback adjustment process: the sensor equipment of the temperature and humidity sensor control system (11) monitors the temperature and humidity levels in the air-conditioned room (10) in real time, compares and calculates the measured actual data with the ideal temperature and humidity set values ​​in the electronic control element, and generates corresponding control signals to control the power of the variable frequency fan (1) and the opening degree of the first control valve, thereby controlling the flow rate, flow rate and dry and wet air flow mixing ratio of the heat transfer fluid, and further adjusting the temperature and humidity of the air delivered to the air-conditioned room.

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