WO2025100615A1 - Mixed refrigerant density or viscosity measurement system and operation method thereof - Google Patents

Mixed refrigerant density or viscosity measurement system and operation method thereof Download PDF

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Publication number
WO2025100615A1
WO2025100615A1 PCT/KR2023/018857 KR2023018857W WO2025100615A1 WO 2025100615 A1 WO2025100615 A1 WO 2025100615A1 KR 2023018857 W KR2023018857 W KR 2023018857W WO 2025100615 A1 WO2025100615 A1 WO 2025100615A1
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WIPO (PCT)
Prior art keywords
refrigerant
density
mixer
mixed refrigerant
mixed
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PCT/KR2023/018857
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French (fr)
Inventor
Seok Hwan Lee
Woong Kang
Hyun Seung Nam
Su Yong Kwon
Sung Jun Lee
Dae Ho Kim
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Korea Research Institute of Standards and Science
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Korea Research Institute of Standards and Science
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Publication of WO2025100615A1 publication Critical patent/WO2025100615A1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/38—Diluting, dispersing or mixing samples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
    • G01N9/266—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences for determining gas density
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N2011/0006—Calibrating, controlling or cleaning viscometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N2011/0006—Calibrating, controlling or cleaning viscometers
    • G01N2011/002—Controlling sample temperature; Thermal cycling during measurement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N2011/0046—In situ measurement during mixing process

Definitions

  • the present invention relates to a system for measuring a physical property of a mixed refrigerant and operation method thereof, and more specifically, to a mixed refrigerant density or viscosity measuring system and operation method thereof.
  • Refrigerants are substances essential for air conditioning systems in buildings or automobiles, and performance of the refrigerants significantly affect the efficiency of air conditioning.
  • GWP global warming potential
  • a thermal conductivity property of the refrigerant needs to be measured to verify the performance of the refrigerant.
  • a density or viscosity property of a refrigerant is a parameter that plays an essential role in setting the operation conditions of the refrigerant and in numerical analysis of heat transfer in heat engines.
  • measuring a density or viscosity property of a mixed refrigerant in which two or more pure substances are mixed needs to be performed through more additional operating processes than measuring a density or viscosity property of a refrigerant made of one substance, thus requiring a more precise technology.
  • a technology that accurately mixes two or more pure substances at a preset ratio needs to be used, and a technology that maintains the operation conditions of a measurement system at constant temperature and pressure is needed to measure a density or viscosity property of the mixed refrigerant.
  • Objects of the present invention to solve the problems described above are to provide a mixed refrigerant density or viscosity measurement system and operation method thereof for accurately measuring a density or viscosity property of a mixed refrigerant.
  • other objects of the present invention are to provide a mixed refrigerant density or viscosity measurement system and operation method thereof for accurately measuring a density or viscosity property of a mixed refrigerant in a liquid or vapor state while a temperature or pressure condition is changed.
  • another object of the present invention is to prevent a mixing ratio of a mixed refrigerant from being changed due to a difference in vapor pressure between mixed refrigerants by converting vapor refrigerants into liquid refrigerants and then mixing the refrigerants.
  • a mixed refrigerant density or viscosity measurement system of the present invention to achieve the objects described above may include: a first refrigerant storage tank that stores a first refrigerant; a second refrigerant storage tank that stores a second refrigerant; a mixer that mixes the first refrigerant and the second refrigerant and generates a mixed refrigerant; a first syringe pump that supplies the first refrigerant stored in the first refrigerant storage tank to the mixer; a second syringe pump that supplies the second refrigerant stored in the second refrigerant storage tank to the mixer; and a density or viscosity measurement device that measures density or viscosity of the mixed refrigerant supplied from the mixer.
  • the first refrigerant and the second refrigerant stored in a vapor state in the first refrigerant storage tank and the second refrigerant storage tank may be pressurized by the first syringe pump and the second syringe pump, respectively, to have pressure equal to or higher than saturation pressure of the first refrigerant and the second refrigerant, may be converted from the vapor state into a liquid state, and then are supplied to the mixer.
  • the density or viscosity measurement device may measure the density or viscosity of the mixed refrigerant while changing a temperature or pressure condition.
  • the saturation pressure of the second refrigerant may be higher than the saturation pressure of the first refrigerant.
  • the first refrigerant and the second refrigerant stored in a vapor state in the first refrigerant storage tank and the second refrigerant storage tank may be pressurized by the first syringe pump and the second syringe pump, respectively, to have pressure equal to or higher than the saturation pressure of the first refrigerant and the second refrigerant to be converted from the vapor state into a liquid state, and then supplied to the mixer.
  • the first refrigerant remaining in a pipe which connects the first syringe pump and the mixer may be substituted with the mixed refrigerant supplied from the mixer.
  • an amount of the mixed refrigerant corresponding to three or more times a volume of the pipe which connects the first syringe pump and the mixer may be supplied from the mixer three or four times.
  • a method for operating the mixed refrigerant density or viscosity measurement system may include: a first refrigerant supply operating step of pressurizing the first refrigerant stored in the vapor state in the first refrigerant storage tank to pressure equal to or higher than the saturation pressure of the first refrigerant to convert the state of the first refrigerant into the liquid state and then supplying the first refrigerant to the mixer; a second refrigerant supply operating step of pressurizing the second refrigerant stored in the vapor state in the second refrigerant storage tank to pressure equal to or higher than the saturation pressure of the second refrigerant by the second syringe pump to convert the state of the first refrigerant into the liquid state and then supplying the second refrigerant to the mixer; and a mixing operating step of mixing the first refrigerant and the second refrigerant supplied in the liquid state and generating a mixed refrigerant by the mixer.
  • the method for operating the mixed refrigerant density or viscosity measurement system may further include a density or viscosity measurement operating step of measuring, by the density or viscosity measurement device, density or viscosity of the mixed refrigerant supplied from the mixer.
  • the density or viscosity measurement device in the density or viscosity measurement operating step, may measure the density or viscosity of the mixed refrigerant while changing a temperature or pressure condition.
  • the saturation pressure of the second refrigerant may be higher than the saturation pressure of the first refrigerant.
  • the method for operating the mixed refrigerant density or viscosity measurement system may further include, before the density or viscosity measurement operating step, a step of substituting the first refrigerant remaining in a pipe which connects the first syringe pump and the mixer with the mixed refrigerant supplied from the mixer.
  • the present invention according to the above-described configuration has an advantage in that the density or viscosity property of the mixed refrigerant can be accurately measured.
  • the density or viscosity property of the mixed refrigerant in the liquid or vapor state can be accurately measured while the temperature or pressure condition is changed.
  • a mixing ratio of the mixed refrigerant can be prevented from being changed due to a difference in vapor pressure between the mixed refrigerants by converting vapor refrigerants into liquid refrigerants and then mixing the refrigerants.
  • FIG. 1 is a configurational diagram of a mixed refrigerant density or viscosity measurement system according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram illustrating a first refrigerant supply operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
  • FIG. 3 is a schematic diagram illustrating a second refrigerant supply operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
  • FIG. 4 is a schematic diagram illustrating a mixed refrigerant substitution operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
  • FIG. 5 is a graph illustrating measurement of density or viscosity of a mixed refrigerant in a density or viscosity measurement device according to the embodiment of the present invention.
  • a case where a certain part “is connected to (accesses, is in contact with, is coupled to)” another part includes not only a case where the parts are “directly connected”, but also a case where the parts are “indirectly connected” with a different member interposed between the parts.
  • a certain part “comprises” a certain configurational element this does not mean that another configurational element is excluded but means that other configurational elements can be further included, unless specifically described otherwise.
  • a term of “...portion”, “...unit”, “...module”, or the like described in the specification means a basic unit that executes at least one function or operation, and an element assigned with the term can be implemented as a combination of pieces of hardware and/or software.
  • a case where a certain step is located "before” or “after” another step not only includes a case where the steps have a direct time-series relationship, but also has the same right as a case where the steps have an indirect time-series relationship in which a time-series order thereof can be changed in the order of the two steps, such as a mixing step after each step.
  • FIG. 1 is a configurational diagram of a mixed refrigerant density or viscosity measurement system according to an embodiment of the present invention.
  • a mixed refrigerant density or viscosity measurement system 1 is divided into a refrigerant injection part configured to include a first refrigerant storage tank 30, a second refrigerant storage tank 80, a first syringe pump 40, a second syringe pump 70, a vacuum pump 20, and a mixer 60, and a measurement part configured of a density or viscosity measurement device 50.
  • One end p2 of the first refrigerant storage tank 30 branches out, a branched end p1 is connected to an exhaust gas storage tank 10, and the other end p3 thereof re-branches out.
  • a re-branched end p4 is connected to the vacuum pump 20, and still another end p5 is connected to the first syringe pump 40.
  • One end p5 of the first syringe pump 40 branches out into three branches p1, p2, and p4 which are connected to the exhaust gas storage tank 10, the first refrigerant storage tank 30, and the vacuum pump 20, respectively, and the other end p6 thereof is connected to the density or viscosity measurement device 50.
  • One end p6 of the density or viscosity measurement device 50 is connected to the first syringe pump 40, and the other end p7 thereof is connected to the mixer 60.
  • One end p7 of the mixer 60 is connected to the density or viscosity measurement device 50, and the other end p8 thereof is connected to the second syringe pump 70.
  • One end p8 of the second syringe pump 70 is connected to the mixer 60, and the other end p9 thereof branches out.
  • a branched end p10 is connected to the second storage tank 80, and the other end p11 thereof is connected to an inert gas storage tank 90.
  • Devices constituting the mixed refrigerant density or viscosity measurement system 1 are connected to each other through pipes.
  • the first refrigerant storage tank 30 stores a first refrigerant in a vapor state
  • the second refrigerant storage tank 80 stores a second refrigerant in a vapor state.
  • the first syringe pump 40 and the second syringe pump 70 respectively pressurize the first refrigerant and the second refrigerant respectively stored in the first refrigerant storage tank 30 and the second refrigerant storage tank 80 to convert the state of the first and second refrigerants into a liquid state and then supply the refrigerants to the mixer 60.
  • the mixer 60 mixes the first refrigerant and the second refrigerant supplied from the first syringe pump 40 and the second syringe pump 70.
  • the mixer 60 supplies a mixed refrigerant to the density or viscosity measurement device 50, and the density or viscosity measurement device 50 measures density or viscosity of the mixed refrigerant.
  • the mixed refrigerant measured in the liquid state is then vaporized, and density or viscosity measurement of the vaporized mixed refrigerant in the vapor state is re-started.
  • the mixed refrigerant in the vapor state is collected in the exhaust gas storage tank 10 and then is discharged to the outside.
  • the mixed refrigerant density or viscosity measurement system 1 first performs a leakage checking operation to check whether gas is leaking inside the measurement system.
  • An inert gas stored in the inert gas storage tank 90 is used to perform the operation, and helium gas can be used as the inert gas.
  • the measurement system supplies helium gas stored in the storage tank into the measurement system and measures the pressure for a period of time by a plurality of pressure meters installed inside the measurement system to check whether a certain degree of pressure or higher is maintained. If a pressure value measured for a period of time by the plurality of pressure meters is not maintained to be a value equal to or higher than a certain degree of pressure, the measurement system determines that gas is leaking inside the measurement system and stops the measurement. In particular, checking is focused on whether gas is leaking from connection portions at which devices are connected to each other.
  • the mixed refrigerant density or viscosity measurement system 1 performs a vacuumization operation to vacuumize the inside of the measurement system.
  • v2, v4, v11, v16, and v17 valves of the measurement system are closed, and the rest of the valves are all opened.
  • the measurement system uses the vacuum pump 20 for the vacuumization operation and operates the vacuum pump 20 to vacuumize the inside of the measurement system. At that time, syringes of the first syringe pump 40 and the second syringe pump 70 are pulled to the maximum, and pressure of the first syringe pump 40, the second syringe pump 70, and the mixer 60 used in pressure control is set to 0 after the inside of the measurement system is vacuumized.
  • the mixed refrigerant density or viscosity measurement system 1 performs a first refrigerant supply operation for supplying the first refrigerant to the mixer 60.
  • FIG. 2 is a schematic diagram illustrating a first refrigerant supply operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
  • the first refrigerant stored in the first refrigerant storage tank 30 is supplied to the mixer 60. However, at that time, the first refrigerant stored in the vapor state in the first refrigerant storage tank 30 is converted into a liquid state and then supplied to the mixer 60. Since a mixing ratio can be changed due to a difference in vapor pressure between the first and second refrigerants when the first refrigerant and the second refrigerant to be mixed in the mixer 60 are supplied in the vapor state, a change in mixing ratio due to the difference in vapor pressure has to be prevented by supplying the first and second refrigerants in the liquid state to the mixer 60 and mixing the refrigerants.
  • the first syringe pump 40 pressurizes the first refrigerant stored in the vapor state in the first refrigerant storage tank 30 to high pressure to convert the state of the first refrigerant into the liquid state and then supplies the refrigerant to the mixer 60.
  • the second syringe pump 70 pressurizes the second refrigerant stored in the vapor state in the second refrigerant storage tank 80 to high pressure to convert the state of the second refrigerant into the liquid state and then supplies the refrigerant to the mixer 60.
  • v3 and v12 valves are closed and the v4 valve is opened such that a pipe from the v3 valve to the v12 valve is filled with the first refrigerant by pressure of the first refrigerant itself.
  • a v7 valve is closed, and the first syringe pump 40 is used to pressurize the first refrigerant to a certain degree of pressure equal to or higher than saturation pressure of the first refrigerant and liquefy the first refrigerant.
  • an operation of supplying the first refrigerant in the liquid state to the mixer 60 is performed.
  • a v13 valve is closed, the first syringe pump 40 pumps out the first refrigerant in a pipe from a v8 valve to the v12 valve, and the mixer 60 brings the first refrigerant in by using a syringe in the mixer 60 to supply the first refrigerant to the mixer 60 while maintaining the certain degree of pressure equal to or higher than the saturation pressure at which the first refrigerant in the pipe maintains the liquid state.
  • the v12 valve is closed, and the operations of the first syringe pump 40 and the mixer 60 are stopped. Then, when the first refrigerant supply operation is completed, a second refrigerant supply operation is performed.
  • FIG. 3 is a schematic diagram illustrating a second refrigerant supply operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
  • the mixed refrigerant density or viscosity measurement system 1 closes the v13 valve and the v17 valve and opens the v16 valve such that a pipe from the v13 valve to the v17 valve is filled with the second refrigerant by self-pressure.
  • the v15 valve When the pipe from the v13 valve to the v17 valve is filled with the second refrigerant, the v15 valve is closed, and the second syringe pump 70 is used to pressurize the second refrigerant to a certain degree of pressure equal to or higher than saturation pressure of the second refrigerant and liquefy the second refrigerant.
  • a target pressure to be reached by pressurizing the second refrigerant needs to be higher than the target pressure to be reached by pressurizing the first refrigerant, and accordingly, the saturation pressure of the second refrigerant needs to be higher than the saturation pressure of the first refrigerant.
  • an operation of supplying the second refrigerant in the liquid state to the mixer 60 is performed.
  • the v15 valve is closed, the second syringe pump 70 pumps out the second refrigerant in a pipe from the v13 valve to the v14 valve, and the mixer 60 brings the second refrigerant in by using a syringe in the mixer 60 to supply the second refrigerant to the mixer 60 while maintaining the certain degree of pressure equal to or higher than the saturation pressure at which the second refrigerant in the pipe maintains the liquid state.
  • the v13 valve is closed, and the operations of the second syringe pump 70 and the mixer 60 are stopped. Then, when the second refrigerant supply operation is completed, an operation for mixing the first refrigerant and the second refrigerant is performed.
  • the mixer 60 is operated at least for 12 hours to mix the first refrigerant and the second refrigerant.
  • the mixed refrigerant is stabilized. Then, an operation for substituting the first refrigerant with the mixed refrigerant is performed.
  • FIG. 4 is a schematic diagram illustrating a mixed refrigerant substitution operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
  • the v8 valve and the v12 valve are opened, the first syringe pump 40 pumps in the first refrigerant remaining in the pipe from the v8 valve to the v12 valve, the mixer 60 pushes out the mixed refrigerant by using the syringe in the mixer 60, and the first refrigerant remaining in the pipe from the v8 valve to the v12 valve is substituted with the mixed refrigerant.
  • a volume of the pipe from the v8 valve to the v12 valve is calculated, and the amount of the mixed refrigerant corresponding to three or more times of the volume is supplied three or four times.
  • the v8 valve is closed, and the operations of the first syringe pump 40 and the mixer 60 are stopped. Then, a measurement operation for measuring the density or viscosity of the mixed refrigerant is performed.
  • the density or viscosity measurement device 50 is used to measure the density or viscosity of the mixed refrigerant while changing pressure and temperature desired to be measured.
  • a commercialized density meter or viscometer is used as illustrated in FIG. 5 as a density meter or a viscometer used in the density or viscosity measurement device 50.
  • FIG. 5 is a graph illustrating measurement of density or viscosity of a mixed refrigerant in a density or viscosity measurement device according to the embodiment of the present invention.
  • the density or viscosity measurement device 50 measures the density or viscosity of the mixed refrigerant supplied from the mixer 60 while changing a temperature or pressure.
  • the initially supplied mixed refrigerant is in the liquid state, and density or viscosity of the mixed refrigerant in the liquid state is measured while the temperature or pressure is changed.
  • the horizontal axis represents a change value of a temperature
  • the vertical axis represents a change value of pressure
  • x marks represent respective measurement points.
  • the density or viscosity measurement device 50 first measures the density or viscosity of the mixed refrigerant in the liquid state under a temperature and pressure of a first state s1. Then, the density or viscosity of the mixed refrigerant is measured while the temperature or pressure is increased sequentially to second, third, and fourth states s2, s3, and s4.
  • the density or viscosity measurement device 50 adjusts the temperature or pressure to vaporize the mixed refrigerant in the liquid state and convert the mixed refrigerant into a mixed refrigerant in the vapor state.
  • the density or viscosity measurement device 50 adjusts the temperature or pressure to a fifth state s5 and measures the density or viscosity of the mixed refrigerant in the vapor state in the fifth state s5.
  • the density or viscosity measurement device 50 measures the density or viscosity of the mixed refrigerant in the vapor state under a temperature and pressure sequentially in sixth and seventh states s6 and s7. In the same method described above, the density or viscosity measurement device 50 measures the density or viscosity of the mixed refrigerant in the liquid or vapor state within a temperature range of -70°C to 180°C and a pressure range of 0 to 100 bar.
  • Equation 1 represents a correction expression for density measurement.
  • the density meter is corrected for a temperature and pressure by using the standard substance, and the density meter is corrected using a fitting equation for calculating eleven coefficients.
  • the viscometer is also fitted with a quadratic equation for temperature, and the viscometer is corrected according to the temperature by using the standard substance and used.

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Abstract

The present invention relates to a system for measuring a physical property of a mixed refrigerant and operation method thereof, and more specifically, to a mixed refrigerant density or viscosity measurement system including: a first refrigerant storage tank that stores a first refrigerant; a second refrigerant storage tank that stores a second refrigerant; a mixer that mixes the first refrigerant and the second refrigerant and generates a mixed refrigerant; a first syringe pump that supplies the first refrigerant stored in the first refrigerant storage tank to the mixer; a second syringe pump that supplies the second refrigerant stored in the second refrigerant storage tank to the mixer; and a density or viscosity measurement device that measures density or viscosity of the mixed refrigerant supplied from the mixer. The first refrigerant and the second refrigerant stored in a vapor state in the first refrigerant storage tank and the second refrigerant storage tank are pressurized by the first syringe pump and the second syringe pump, respectively, to have pressure equal to or higher than saturation pressure of the first refrigerant and the second refrigerant, are converted from the vapor state into a liquid state, and then are supplied to the mixer.

Description

MIXED REFRIGERANT DENSITY OR VISCOSITY MEASUREMENT SYSTEM AND OPERATION METHOD THEREOF
The present invention relates to a system for measuring a physical property of a mixed refrigerant and operation method thereof, and more specifically, to a mixed refrigerant density or viscosity measuring system and operation method thereof.
Refrigerants are substances essential for air conditioning systems in buildings or automobiles, and performance of the refrigerants significantly affect the efficiency of air conditioning. However, recent environmental issues resulted in many studies for reducing global warming potential (hereinafter, referred to as GWP) of previously used refrigerants, and many overseas companies attempted to develop advanced refrigerants having low GWP.
When a new refrigerant is developed, a thermal conductivity property of the refrigerant needs to be measured to verify the performance of the refrigerant. A density or viscosity property of a refrigerant is a parameter that plays an essential role in setting the operation conditions of the refrigerant and in numerical analysis of heat transfer in heat engines.
If a density or viscosity property of a refrigerant is not accurately measured, or a measurement value is not constant but changes depending on measurement conditions, problems arise in that it is not possible to accurately set the operation conditions of the refrigerant and that numerical analysis of heat transfer of a heat engine is not clearly conducted.
Hence, it is very important to accurately measure a density or viscosity property of a refrigerant and have a measurement value that is constant without changing depending on measurement conditions.
In particular, measuring a density or viscosity property of a mixed refrigerant in which two or more pure substances are mixed needs to be performed through more additional operating processes than measuring a density or viscosity property of a refrigerant made of one substance, thus requiring a more precise technology. A technology that accurately mixes two or more pure substances at a preset ratio needs to be used, and a technology that maintains the operation conditions of a measurement system at constant temperature and pressure is needed to measure a density or viscosity property of the mixed refrigerant.
Technologies that measure a density or viscosity property of a mixed refrigerant are developed in overseas universities and research institutes in Germany, Australia, U.S.A, and the like; however, in Korea, the technologies are not sufficiently developed, and thus the technologies that accurately measure a density or viscosity property of a mixed refrigerant need to be urgently developed.
Objects of the present invention to solve the problems described above are to provide a mixed refrigerant density or viscosity measurement system and operation method thereof for accurately measuring a density or viscosity property of a mixed refrigerant.
In addition, other objects of the present invention are to provide a mixed refrigerant density or viscosity measurement system and operation method thereof for accurately measuring a density or viscosity property of a mixed refrigerant in a liquid or vapor state while a temperature or pressure condition is changed.
In addition, another object of the present invention is to prevent a mixing ratio of a mixed refrigerant from being changed due to a difference in vapor pressure between mixed refrigerants by converting vapor refrigerants into liquid refrigerants and then mixing the refrigerants.
Technical objects to be achieved by the present invention are not limited to the technical objects mentioned above, and the following description enables other unmentioned technical objects to be clearly understood by a person of ordinary skill in the art to which the present invention pertains.
A mixed refrigerant density or viscosity measurement system of the present invention to achieve the objects described above may include: a first refrigerant storage tank that stores a first refrigerant; a second refrigerant storage tank that stores a second refrigerant; a mixer that mixes the first refrigerant and the second refrigerant and generates a mixed refrigerant; a first syringe pump that supplies the first refrigerant stored in the first refrigerant storage tank to the mixer; a second syringe pump that supplies the second refrigerant stored in the second refrigerant storage tank to the mixer; and a density or viscosity measurement device that measures density or viscosity of the mixed refrigerant supplied from the mixer. The first refrigerant and the second refrigerant stored in a vapor state in the first refrigerant storage tank and the second refrigerant storage tank may be pressurized by the first syringe pump and the second syringe pump, respectively, to have pressure equal to or higher than saturation pressure of the first refrigerant and the second refrigerant, may be converted from the vapor state into a liquid state, and then are supplied to the mixer.
In an embodiment of the present invention, the density or viscosity measurement device may measure the density or viscosity of the mixed refrigerant while changing a temperature or pressure condition.
In the embodiment of the present invention, the saturation pressure of the second refrigerant may be higher than the saturation pressure of the first refrigerant.
In the embodiment of the present invention, the first refrigerant and the second refrigerant stored in a vapor state in the first refrigerant storage tank and the second refrigerant storage tank may be pressurized by the first syringe pump and the second syringe pump, respectively, to have pressure equal to or higher than the saturation pressure of the first refrigerant and the second refrigerant to be converted from the vapor state into a liquid state, and then supplied to the mixer.
In the embodiment of the present invention, before the density or viscosity of the mixed refrigerant is measured by the density or viscosity measurement device, the first refrigerant remaining in a pipe which connects the first syringe pump and the mixer may be substituted with the mixed refrigerant supplied from the mixer.
In the embodiment of the present invention, an amount of the mixed refrigerant corresponding to three or more times a volume of the pipe which connects the first syringe pump and the mixer may be supplied from the mixer three or four times.
In another embodiment of the present invention, a method for operating the mixed refrigerant density or viscosity measurement system may include: a first refrigerant supply operating step of pressurizing the first refrigerant stored in the vapor state in the first refrigerant storage tank to pressure equal to or higher than the saturation pressure of the first refrigerant to convert the state of the first refrigerant into the liquid state and then supplying the first refrigerant to the mixer; a second refrigerant supply operating step of pressurizing the second refrigerant stored in the vapor state in the second refrigerant storage tank to pressure equal to or higher than the saturation pressure of the second refrigerant by the second syringe pump to convert the state of the first refrigerant into the liquid state and then supplying the second refrigerant to the mixer; and a mixing operating step of mixing the first refrigerant and the second refrigerant supplied in the liquid state and generating a mixed refrigerant by the mixer.
In another embodiment of the present invention, the method for operating the mixed refrigerant density or viscosity measurement system may further include a density or viscosity measurement operating step of measuring, by the density or viscosity measurement device, density or viscosity of the mixed refrigerant supplied from the mixer.
In another embodiment of the present invention, in the density or viscosity measurement operating step, the density or viscosity measurement device may measure the density or viscosity of the mixed refrigerant while changing a temperature or pressure condition.
In another embodiment of the present invention, the saturation pressure of the second refrigerant may be higher than the saturation pressure of the first refrigerant.
In another embodiment of the present invention, the method for operating the mixed refrigerant density or viscosity measurement system may further include, before the density or viscosity measurement operating step, a step of substituting the first refrigerant remaining in a pipe which connects the first syringe pump and the mixer with the mixed refrigerant supplied from the mixer.
In another embodiment of the present invention, an amount of the mixed refrigerant corresponding to three or more times a volume of the pipe which connects the first syringe pump and the mixer may be supplied from the mixer three or four times.
The present invention according to the above-described configuration has an advantage in that the density or viscosity property of the mixed refrigerant can be accurately measured.
In addition, according to the present invention, the density or viscosity property of the mixed refrigerant in the liquid or vapor state can be accurately measured while the temperature or pressure condition is changed.
In addition, according to the present invention, a mixing ratio of the mixed refrigerant can be prevented from being changed due to a difference in vapor pressure between the mixed refrigerants by converting vapor refrigerants into liquid refrigerants and then mixing the refrigerants.
Effects of the present invention are not limited to the effects described above and should be understood to include every effect that can be inferred from configurations of the inventions to be described in detailed descriptions or claims of the present invention.
While the present invention has been described with respect to the specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
FIG. 1 is a configurational diagram of a mixed refrigerant density or viscosity measurement system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating a first refrigerant supply operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
FIG. 3 is a schematic diagram illustrating a second refrigerant supply operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
FIG. 4 is a schematic diagram illustrating a mixed refrigerant substitution operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
FIG. 5 is a graph illustrating measurement of density or viscosity of a mixed refrigerant in a density or viscosity measurement device according to the embodiment of the present invention.
Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention can be implemented as various different embodiments and thus is not limited to embodiments to be described here. Further, a part unrelated to description is omitted in the drawings for a clear description of the present invention, and similar reference numerals are assigned to similar parts throughout the entire specification.
In the entire specification, a case where a certain part “is connected to (accesses, is in contact with, is coupled to)” another part includes not only a case where the parts are “directly connected”, but also a case where the parts are “indirectly connected” with a different member interposed between the parts. In addition, when a certain part “comprises” a certain configurational element, this does not mean that another configurational element is excluded but means that other configurational elements can be further included, unless specifically described otherwise.
Terms used in this specification are used to describe only a specific embodiment and are not intentionally used to limit the present invention thereto. A word having a singular form represents both singular and plural forms of the word, unless obviously implied otherwise in context. In this specification, a term such as “to comprise” or “to include” is to be construed to specify presence of a feature, a number, a step, an operation, a configurational element, a component, or a combination thereof described in the specification and not to exclude presence or a possibility of addition of one or more other features, numbers, steps, operations, configurational elements, components, or combinations thereof in advance.
In addition, a term of “...portion”, “...unit”, “...module”, or the like described in the specification means a basic unit that executes at least one function or operation, and an element assigned with the term can be implemented as a combination of pieces of hardware and/or software.
In addition, in this specification, a case where a certain step is located "before" or "after" another step not only includes a case where the steps have a direct time-series relationship, but also has the same right as a case where the steps have an indirect time-series relationship in which a time-series order thereof can be changed in the order of the two steps, such as a mixing step after each step.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a configurational diagram of a mixed refrigerant density or viscosity measurement system according to an embodiment of the present invention.
With reference to FIG. 1, a mixed refrigerant density or viscosity measurement system 1 is divided into a refrigerant injection part configured to include a first refrigerant storage tank 30, a second refrigerant storage tank 80, a first syringe pump 40, a second syringe pump 70, a vacuum pump 20, and a mixer 60, and a measurement part configured of a density or viscosity measurement device 50.
One end p2 of the first refrigerant storage tank 30 branches out, a branched end p1 is connected to an exhaust gas storage tank 10, and the other end p3 thereof re-branches out. A re-branched end p4 is connected to the vacuum pump 20, and still another end p5 is connected to the first syringe pump 40. One end p5 of the first syringe pump 40 branches out into three branches p1, p2, and p4 which are connected to the exhaust gas storage tank 10, the first refrigerant storage tank 30, and the vacuum pump 20, respectively, and the other end p6 thereof is connected to the density or viscosity measurement device 50. One end p6 of the density or viscosity measurement device 50 is connected to the first syringe pump 40, and the other end p7 thereof is connected to the mixer 60. One end p7 of the mixer 60 is connected to the density or viscosity measurement device 50, and the other end p8 thereof is connected to the second syringe pump 70. One end p8 of the second syringe pump 70 is connected to the mixer 60, and the other end p9 thereof branches out. A branched end p10 is connected to the second storage tank 80, and the other end p11 thereof is connected to an inert gas storage tank 90. Devices constituting the mixed refrigerant density or viscosity measurement system 1 are connected to each other through pipes.
The first refrigerant storage tank 30 stores a first refrigerant in a vapor state, and the second refrigerant storage tank 80 stores a second refrigerant in a vapor state. The first syringe pump 40 and the second syringe pump 70 respectively pressurize the first refrigerant and the second refrigerant respectively stored in the first refrigerant storage tank 30 and the second refrigerant storage tank 80 to convert the state of the first and second refrigerants into a liquid state and then supply the refrigerants to the mixer 60. The mixer 60 mixes the first refrigerant and the second refrigerant supplied from the first syringe pump 40 and the second syringe pump 70. Then, the mixer 60 supplies a mixed refrigerant to the density or viscosity measurement device 50, and the density or viscosity measurement device 50 measures density or viscosity of the mixed refrigerant. The mixed refrigerant measured in the liquid state is then vaporized, and density or viscosity measurement of the vaporized mixed refrigerant in the vapor state is re-started. When the density or viscosity measurement of the mixed refrigerant in the vapor state is finished, the mixed refrigerant in the vapor state is collected in the exhaust gas storage tank 10 and then is discharged to the outside.
A brief description of configurations and operations of devices of the mixed refrigerant density or viscosity measurement system 1 is provided. Subsequently, operations of the mixed refrigerant density or viscosity measurement system 1 will be described in detail.
The mixed refrigerant density or viscosity measurement system 1 first performs a leakage checking operation to check whether gas is leaking inside the measurement system. An inert gas stored in the inert gas storage tank 90 is used to perform the operation, and helium gas can be used as the inert gas.
The measurement system supplies helium gas stored in the storage tank into the measurement system and measures the pressure for a period of time by a plurality of pressure meters installed inside the measurement system to check whether a certain degree of pressure or higher is maintained. If a pressure value measured for a period of time by the plurality of pressure meters is not maintained to be a value equal to or higher than a certain degree of pressure, the measurement system determines that gas is leaking inside the measurement system and stops the measurement. In particular, checking is focused on whether gas is leaking from connection portions at which devices are connected to each other.
When the leakage checking operation is completed, subsequently, the mixed refrigerant density or viscosity measurement system 1 performs a vacuumization operation to vacuumize the inside of the measurement system. For the vacuumization operation, v2, v4, v11, v16, and v17 valves of the measurement system are closed, and the rest of the valves are all opened.
The measurement system uses the vacuum pump 20 for the vacuumization operation and operates the vacuum pump 20 to vacuumize the inside of the measurement system. At that time, syringes of the first syringe pump 40 and the second syringe pump 70 are pulled to the maximum, and pressure of the first syringe pump 40, the second syringe pump 70, and the mixer 60 used in pressure control is set to 0 after the inside of the measurement system is vacuumized.
When the vacuumization operation is completed, the mixed refrigerant density or viscosity measurement system 1 performs a first refrigerant supply operation for supplying the first refrigerant to the mixer 60.
FIG. 2 is a schematic diagram illustrating a first refrigerant supply operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
With reference to FIG. 2, the first refrigerant stored in the first refrigerant storage tank 30 is supplied to the mixer 60. However, at that time, the first refrigerant stored in the vapor state in the first refrigerant storage tank 30 is converted into a liquid state and then supplied to the mixer 60. Since a mixing ratio can be changed due to a difference in vapor pressure between the first and second refrigerants when the first refrigerant and the second refrigerant to be mixed in the mixer 60 are supplied in the vapor state, a change in mixing ratio due to the difference in vapor pressure has to be prevented by supplying the first and second refrigerants in the liquid state to the mixer 60 and mixing the refrigerants.
Hence, the first syringe pump 40 pressurizes the first refrigerant stored in the vapor state in the first refrigerant storage tank 30 to high pressure to convert the state of the first refrigerant into the liquid state and then supplies the refrigerant to the mixer 60. Similarly when the second refrigerant is supplied to the mixer 60, the second syringe pump 70 pressurizes the second refrigerant stored in the vapor state in the second refrigerant storage tank 80 to high pressure to convert the state of the second refrigerant into the liquid state and then supplies the refrigerant to the mixer 60.
In order to supply the first refrigerant stored in the first refrigerant storage tank 30 to the mixer 60, v3 and v12 valves are closed and the v4 valve is opened such that a pipe from the v3 valve to the v12 valve is filled with the first refrigerant by pressure of the first refrigerant itself. Then, a v7 valve is closed, and the first syringe pump 40 is used to pressurize the first refrigerant to a certain degree of pressure equal to or higher than saturation pressure of the first refrigerant and liquefy the first refrigerant. If pressure of the first refrigerant does not reach a target pressure set by the system even when the first refrigerant in the first syringe pump 40 is completely pumped out, processes of refilling the first syringe pump 40 with the first refrigerant by closing a v8 valve and opening the v4 and v7 valves and then liquefying the first refrigerant are repeatedly performed. At that time, if density or viscosity of the first refrigerant alone which is one refrigerant is intended to be measured, a v10 valve is closed, and the density or viscosity measurement device 50 is used to measure the density or viscosity of the first refrigerant.
When the operation of converting the first refrigerant from the vapor state into the liquid state is completed, an operation of supplying the first refrigerant in the liquid state to the mixer 60 is performed. At that time, a v13 valve is closed, the first syringe pump 40 pumps out the first refrigerant in a pipe from a v8 valve to the v12 valve, and the mixer 60 brings the first refrigerant in by using a syringe in the mixer 60 to supply the first refrigerant to the mixer 60 while maintaining the certain degree of pressure equal to or higher than the saturation pressure at which the first refrigerant in the pipe maintains the liquid state. When the entire amount of the first refrigerant is supplied to the mixer 60 according to a mixing ratio calculated in advance, the v12 valve is closed, and the operations of the first syringe pump 40 and the mixer 60 are stopped. Then, when the first refrigerant supply operation is completed, a second refrigerant supply operation is performed.
FIG. 3 is a schematic diagram illustrating a second refrigerant supply operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
With reference to FIG. 3, in the second refrigerant supply operation, the mixed refrigerant density or viscosity measurement system 1 closes the v13 valve and the v17 valve and opens the v16 valve such that a pipe from the v13 valve to the v17 valve is filled with the second refrigerant by self-pressure.
When the pipe from the v13 valve to the v17 valve is filled with the second refrigerant, the v15 valve is closed, and the second syringe pump 70 is used to pressurize the second refrigerant to a certain degree of pressure equal to or higher than saturation pressure of the second refrigerant and liquefy the second refrigerant. At that time, a target pressure to be reached by pressurizing the second refrigerant needs to be higher than the target pressure to be reached by pressurizing the first refrigerant, and accordingly, the saturation pressure of the second refrigerant needs to be higher than the saturation pressure of the first refrigerant.
Similarly to the first refrigerant, if pressure of the second refrigerant does not reach the target pressure set by the system even when the second refrigerant in the second syringe pump 70 is completely pumped out, processes of refilling the second syringe pump 70 with the second refrigerant by closing a v14 valve and opening the v15 and v16 valves and then liquefying the second refrigerant are repeatedly performed.
When the operation of liquefying the second refrigerant is completed, an operation of supplying the second refrigerant in the liquid state to the mixer 60 is performed. At that time, the v15 valve is closed, the second syringe pump 70 pumps out the second refrigerant in a pipe from the v13 valve to the v14 valve, and the mixer 60 brings the second refrigerant in by using a syringe in the mixer 60 to supply the second refrigerant to the mixer 60 while maintaining the certain degree of pressure equal to or higher than the saturation pressure at which the second refrigerant in the pipe maintains the liquid state. When the entire amount of the second refrigerant is supplied to the mixer 60 according to the mixing ratio calculated in advance, the v13 valve is closed, and the operations of the second syringe pump 70 and the mixer 60 are stopped. Then, when the second refrigerant supply operation is completed, an operation for mixing the first refrigerant and the second refrigerant is performed.
In the operation for mixing the first refrigerant and the second refrigerant, the mixer 60 is operated at least for 12 hours to mix the first refrigerant and the second refrigerant. When mixing is completed, the mixed refrigerant is stabilized. Then, an operation for substituting the first refrigerant with the mixed refrigerant is performed.
FIG. 4 is a schematic diagram illustrating a mixed refrigerant substitution operation of the mixed refrigerant density or viscosity measurement system according to the embodiment of the present invention.
With reference to FIG. 4, the v8 valve and the v12 valve are opened, the first syringe pump 40 pumps in the first refrigerant remaining in the pipe from the v8 valve to the v12 valve, the mixer 60 pushes out the mixed refrigerant by using the syringe in the mixer 60, and the first refrigerant remaining in the pipe from the v8 valve to the v12 valve is substituted with the mixed refrigerant. In order to complete substituting the first refrigerant with the mixed refrigerant, a volume of the pipe from the v8 valve to the v12 valve is calculated, and the amount of the mixed refrigerant corresponding to three or more times of the volume is supplied three or four times. Then, when the substitution operation is completed, the v8 valve is closed, and the operations of the first syringe pump 40 and the mixer 60 are stopped. Then, a measurement operation for measuring the density or viscosity of the mixed refrigerant is performed.
In the measurement operation, after a v9 valve is closed and the mixed refrigerant is stabilized at least for 12 hours, the density or viscosity measurement device 50 is used to measure the density or viscosity of the mixed refrigerant while changing pressure and temperature desired to be measured. A commercialized density meter or viscometer is used as illustrated in FIG. 5 as a density meter or a viscometer used in the density or viscosity measurement device 50.
FIG. 5 is a graph illustrating measurement of density or viscosity of a mixed refrigerant in a density or viscosity measurement device according to the embodiment of the present invention.
With reference to FIG. 5, in the measurement operation, the density or viscosity measurement device 50 measures the density or viscosity of the mixed refrigerant supplied from the mixer 60 while changing a temperature or pressure.
The initially supplied mixed refrigerant is in the liquid state, and density or viscosity of the mixed refrigerant in the liquid state is measured while the temperature or pressure is changed. In the graph, the horizontal axis represents a change value of a temperature, the vertical axis represents a change value of pressure, and x marks represent respective measurement points.
The density or viscosity measurement device 50 first measures the density or viscosity of the mixed refrigerant in the liquid state under a temperature and pressure of a first state s1. Then, the density or viscosity of the mixed refrigerant is measured while the temperature or pressure is increased sequentially to second, third, and fourth states s2, s3, and s4.
When the measurement of the density or viscosity of the mixed refrigerant is completed in the fourth state s4, the density or viscosity measurement device 50 adjusts the temperature or pressure to vaporize the mixed refrigerant in the liquid state and convert the mixed refrigerant into a mixed refrigerant in the vapor state. When the mixed refrigerant in the liquid state is converted into the mixed refrigerant in the vapor state, the density or viscosity measurement device 50 adjusts the temperature or pressure to a fifth state s5 and measures the density or viscosity of the mixed refrigerant in the vapor state in the fifth state s5. Then, the density or viscosity measurement device 50 measures the density or viscosity of the mixed refrigerant in the vapor state under a temperature and pressure sequentially in sixth and seventh states s6 and s7. In the same method described above, the density or viscosity measurement device 50 measures the density or viscosity of the mixed refrigerant in the liquid or vapor state within a temperature range of -70°C to 180°C and a pressure range of 0 to 100 bar.
When the measurement operation for measuring the density or viscosity of the mixed refrigerant is completed, a correction operation for correcting a measured density value or viscosity value is performed.
For the correction operation, a refrigerant made of a standard substance is used. Equation 1 represents a correction expression for density measurement. The density meter is corrected for a temperature and pressure by using the standard substance, and the density meter is corrected using a fitting equation for calculating eleven coefficients. The viscometer is also fitted with a quadratic equation for temperature, and the viscometer is corrected according to the temperature by using the standard substance and used.
Equation 1
Figure PCTKR2023018857-appb-img-000001
The descriptions of the present invention described above are provided on the basis of the limited drawings and are provided as examples, but a person of ordinary skill in the art to which the present invention pertains can understand that it is possible to easily modify the present invention to other embodiments without changing the technical idea or the essential feature of the present invention. Therefore, the embodiments described above are to be understood as examples and not as embodiments described to limit the present invention, in every aspect. For example, each configurational element described in a singular form may be implemented in a distributed manner. Similarly, configurational elements described in a distributed manner may be implemented in a combined manner. In addition, the described techniques may be performed in an order different from that in the described method.
The embodiments and the accompanying drawings described in this specification are merely embodiments and drawings with which a part of the technical idea involved in the present invention is exemplified. Hence, the scope of the present invention is to be represented by the claims to be described below, and every modified or changed embodiment derived from the meaning, the scope, and equivalent concepts of the claims is to be construed to be included in the scope of the present invention.

Claims (12)

  1. A mixed refrigerant density or viscosity measurement device comprising:
    a first refrigerant storage tank that stores a first refrigerant;
    a second refrigerant storage tank that stores a second refrigerant;
    a mixer that mixes the first refrigerant and the second refrigerant and generates a mixed refrigerant;
    a first syringe pump that supplies the first refrigerant stored in the first refrigerant storage tank to the mixer; and
    a second syringe pump that supplies the second refrigerant stored in the second refrigerant storage tank to the mixer,
    wherein density or viscosity of the mixed refrigerant supplied from the mixer is measured.
  2. The mixed refrigerant density or viscosity measurement device according to claim 1,
    wherein the density or viscosity of the mixed refrigerant is measured while changing a temperature or pressure condition.
  3. The mixed refrigerant density or viscosity measurement device according to claim 1,
    wherein saturation pressure of the second refrigerant is higher than saturation pressure of the first refrigerant.
  4. A mixed refrigerant density or viscosity measurement system comprising the mixed refrigerant density or viscosity measurement device according to claim 1,
    wherein the first refrigerant and the second refrigerant stored in a vapor state in the first refrigerant storage tank and the second refrigerant storage tank are pressurized by the first syringe pump and the second syringe pump, respectively, to have pressure equal to or higher than saturation pressure of the first refrigerant and the second refrigerant, are converted from the vapor state into a liquid state, and then are supplied to the mixer.
  5. The mixed refrigerant density or viscosity measurement system according to claim 4,
    wherein, before the density or viscosity of the mixed refrigerant is measured by the mixed refrigerant density or viscosity measurement device, the first refrigerant remaining in a pipe which connects the first syringe pump and the mixer is substituted with the mixed refrigerant supplied from the mixer.
  6. The mixed refrigerant density or viscosity measurement system according to claim 5,
    an amount of the mixed refrigerant corresponding to three or more times a volume of the pipe which connects the first syringe pump and the mixer is supplied from the mixer three or four times.
  7. A method for operating the mixed refrigerant density or viscosity measurement system according to claim 4, the method comprising:
    a first refrigerant supply operating step of pressurizing the first refrigerant stored in the vapor state in the first refrigerant storage tank to pressure equal to or higher than the saturation pressure of the first refrigerant by the first syringe pump to convert the state of the first refrigerant into the liquid state, and then supplying the first refrigerant to the mixer;
    a second refrigerant supply operating step of pressurizing the second refrigerant stored in the vapor state in the second refrigerant storage tank to pressure equal to or higher than the saturation pressure of the second refrigerant by the second syringe pump to convert the state of the first refrigerant into the liquid state, and then supplying the second refrigerant to the mixer; and
    a mixing operating step of mixing the first refrigerant and the second refrigerant supplied in the liquid state and generating a mixed refrigerant by the mixer.
  8. The method for operating the mixed refrigerant density or viscosity measurement system according to claim 7, further comprising:
    a density or viscosity measurement operating step of measuring, by the mixed refrigerant density or viscosity measurement device, density or viscosity of the mixed refrigerant supplied from the mixer.
  9. The method for operating the mixed refrigerant density or viscosity measurement system according to claim 8,
    wherein, in the density or viscosity measurement operating step, the mixed refrigerant density or viscosity measurement device measures the density or viscosity of the mixed refrigerant while changing a temperature or pressure condition.
  10. The method for operating the mixed refrigerant density or viscosity measurement system according to claim 8,
    wherein the saturation pressure of the second refrigerant is higher than the saturation pressure of the first refrigerant.
  11. The method for operating the mixed refrigerant density or viscosity measurement system according to claim 8, further comprising:
    a step of substituting the first refrigerant remaining in a pipe which connects the first syringe pump and the mixer with the mixed refrigerant supplied from the mixer, before the density or viscosity measurement operating step.
  12. The method for operating the mixed refrigerant density or viscosity measurement system according to claim 11,
    wherein an amount of the mixed refrigerant corresponding to three or more times a volume of the pipe which connects the first syringe pump and the mixer is supplied from the mixer three or four times.
PCT/KR2023/018857 2023-11-07 2023-11-22 Mixed refrigerant density or viscosity measurement system and operation method thereof Pending WO2025100615A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102046370B1 (en) * 2018-01-10 2019-12-02 한국표준과학연구원 Apparatus and method for producing Mixed Refrigerant Reference Material
KR20230060843A (en) * 2021-10-28 2023-05-08 대우조선해양 주식회사 Sampling System Of Zeotropic Refrigerant Mixture For Regasification Process In Ship

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102046370B1 (en) * 2018-01-10 2019-12-02 한국표준과학연구원 Apparatus and method for producing Mixed Refrigerant Reference Material
KR20230060843A (en) * 2021-10-28 2023-05-08 대우조선해양 주식회사 Sampling System Of Zeotropic Refrigerant Mixture For Regasification Process In Ship

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
AL GHAFRI SAIF ZS.; ROWLAND DARREN; AKHFASH MASOUMEH; ARAMI-NIYA ARASH; KHAMPHASITH MARTIN; XIAO XIONG; TSUJI TOMOYA; TANAKA YUKIO: "Thermodynamic properties of hydrofluoroolefin (R1234yf and R1234ze(E)) refrigerant mixtures: Density, vapour-liquid equilibrium, and heat capacity data and modelling", INTERNATIONAL JOURNAL OF REFRIGERATION, ELSEVIER, AMSTERDAM, NL, vol. 98, 1 January 1900 (1900-01-01), AMSTERDAM, NL , pages 249 - 260, XP085587359, ISSN: 0140-7007, DOI: 10.1016/j.ijrefrig.2018.10.027 *
OAKLEY ET AL.: "High-pressure melting temperature measurements in mixtures relevant to liquefied natural gas production and comparisons with model predictions", JOURNAL OF CHEMICAL & ENGINEERING, vol. 66, no. 11, 2021, XP093314165, DOI: 10.1021/acs.jced.1c00321 *
XIAO ET AL.: "Isobaric heat capacity measurements of natural gas model mixtures (methane+ n-heptane) and (propane+ n-heptane) by differential scanning calorimetry at temperatures from 313 K to 422 K and pressures up to 31 MPa", FUEL, vol. 296, 2021, pages 1 - 14, XP086540712, DOI: 10.1016/j.fuel.2021.120668 *

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