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KR-20260063110-A - METHOD FOR MANUFACTURING CARBON AEROGEL STRUCTURE FOR REFRIGERANT ABSORPTION AND DESORPTION

KR20260063110AKR 20260063110 AKR20260063110 AKR 20260063110AKR-20260063110-A

Abstract

The present invention relates to a method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption, comprising the steps of: mixing and stirring a graphene oxide solution and a hydrazine-based reducing agent to form a first solution; mixing and stirring a metal halide salt and deionized water to form a second solution; adding and stirring the second solution at a constant rate onto the first solution to form a composite solution; introducing the composite solution into a mold and freeze-drying it to form a gelled carbon body; and heating and drying the gelled carbon body on the mold.

Inventors

  • 강태경
  • 오승균
  • 송정호

Assignees

  • 주식회사 이엔플러스

Dates

Publication Date
20260507
Application Date
20241030

Claims (11)

  1. A step of forming a first solution by mixing and stirring a graphene oxide solution and a hydrazine-based reducing agent; A step of forming a second solution by mixing and stirring a metal halide salt and deionized water; A step of forming a composite solution by adding and stirring the second solution at a constant rate onto the first solution; A step of introducing the above composite solution into a mold and then freeze-drying to form a gelled carbon body; and A step comprising heating and drying the gelled carbon body on the mold above; Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  2. In paragraph 1, The above hydrazine-based reducing agent is characterized by being one or more selected from the group consisting of hydrazine, hydrazine hydrate, sodium hydrazine, and alkyl hydrazine. Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  3. In paragraph 1, The step of forming the first solution is characterized by forming the first solution by further adding a carbon nanotube solution. Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  4. In paragraph 1, The step of forming the first solution is characterized by mixing the graphene oxide solution and the hydrazine-based reducing agent and stirring for 1 to 6 hours. Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  5. In paragraph 1, The above metal halide salt is characterized by being one or more selected from the group consisting of NH₄Cl , NaBr, BaCl₂ , LiCl, PbCl₂ , and CaCl₂ . Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  6. In paragraph 1, The step of forming the second solution is characterized by mixing the metal halide salt and deionized water and stirring for 1 to 6 hours. Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  7. In paragraph 1, The step of forming the above composite solution is characterized by adding the second solution to the first solution and stirring for 4 to 12 hours. Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  8. In paragraph 1, The step of heating and drying the gelled carbon body is characterized by heating at a temperature of 50 to 150 ℃ for 1 to 10 hours. Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  9. In paragraph 1, The method for manufacturing the above-mentioned carbon aerogel structure for refrigerant adsorption and desorption is: The method further comprises the step of separating the heat-dried gelled carbon body from the molding die. Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  10. In paragraph 1, The method for manufacturing the above-mentioned carbon aerogel structure for refrigerant adsorption and desorption is: The method further comprises the step of stacking two or more of the above-described separated gelled carbon bodies inside an adsorption/desorption reactor. Method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption.
  11. A carbon aerogel structure for refrigerant adsorption and desorption manufactured by the manufacturing method of any one of claims 1 to 10.

Description

Method for manufacturing a carbon aerogel structure for refrigerant absorption and desorption The present invention relates to a method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption, and more specifically, to a method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption, which is introduced into a refrigerant adsorption and desorption reactor during the operation of a heat pump system, by a room temperature synthesis method. Meanwhile, this research is a project conducted with support from the Ministry of Trade, Industry and Energy (MOTIE) and the Korea Energy Technology Evaluation Institute (KETEP) (No. 20212050100010). Generally, an air conditioner is a device that cools or heats an indoor space by performing the processes of compressing, condensing, expanding, and evaporating a refrigerant. The air conditioner is classified into a conventional air conditioner in which one indoor unit is connected to an outdoor unit, and a multi-air conditioner in which multiple indoor units are connected to an outdoor unit. The air conditioner includes a compressor, a condenser, an expansion valve, and an evaporator. The refrigerant discharged from the compressor is condensed in the condenser and then expanded in the expansion valve. The expanded refrigerant is evaporated in the evaporator and then drawn into the compressor. In the case of a heat pump capable of both cooling and heating operations, during cooling operation, the outdoor heat exchanger acts as a condenser that condenses the high-temperature, high-pressure refrigerant discharged from the compressor into liquid refrigerant by exchanging heat with the outdoor heat exchanger, while the indoor heat exchanger acts as an evaporator. The basic cycle of an adsorption heat pump consists of the following four parts: an adsorption-desorption reactor containing an adsorbent, a condenser, an evaporator, and an expansion valve. The adsorption heat pump operates by circulating the adsorbate between the adsorption-desorption reactor, the condenser, and the evaporator. In an adsorption heat pump, the adsorption phenomenon acts as mechanical power, and the working fluid can circulate in the cycle without mechanical power. An adsorption heat pump can be considered as consisting of two separate cycles. The first cycle involves the heat pump taking heat Q L from a heat source at a low temperature T L , evaporating it in an evaporator, and releasing heat Qa to a heat source at an intermediate temperature Ta; this cycle is the adsorption process. The second cycle involves the heat engine taking heat Qz from a heat source at a high temperature Tz and releasing heat Qc to a second intermediate temperature Tc. During the condensation of the working fluid in the condenser, heat Qc is transferred to the second intermediate temperature heat source; this cycle is the desorption process. Meanwhile, active development is underway for chemical adsorption cycles that can drastically reduce the thermal energy required for desorption in chemical adsorption heat pumps. For example, if the temperature at which the adsorption material desorbs the refrigerant can be lowered to 40°C or lower, the energy input required to drive the refrigerant can be minimized by utilizing readily available thermal waste for refrigerant desorption. The inventors confirmed that ammonia, one of the eco-friendly refrigerants, can be desorbed at 40°C or lower even under relatively high pressure, and developed a method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption used in an adsorption and desorption reactor to improve the adsorption and desorption performance and speed in an adsorption and desorption reactor within a chemical adsorption heat pump, thereby completing the present invention. FIG. 1 is a flowchart illustrating the method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption according to one embodiment of the present invention, showing the steps of each step. FIG. 2 is a schematic diagram illustrating the process of introducing a carbon aerogel structure for refrigerant adsorption and desorption, manufactured by a method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption according to one embodiment of the present invention, into an adsorption and desorption reactor of a chemical adsorption type heat pump. Figure 3 illustrates an image of a method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption according to one embodiment of the present invention, taken by photographing each step. Figure 4 illustrates the shape of a carbon aerogel structure for refrigerant adsorption and desorption manufactured by a method for manufacturing a carbon aerogel structure for refrigerant adsorption and desorption according to one embodiment of the present invention, as well as a photographic image and a schema