# US 2025/0085244 A1 · Method and system for evaluating insulation performance of low-temperature storage tank > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0085244 A1 - Document ID: US20250085244A1 - Status: Published application - Kind: A1 - Application number: 18/550,615 - Filed: 2021-11-26 - Published: 2025-03-13 - Earliest claimed: 2020-11-27 - Applicants: Korea Institute of Machinery & Materials - Inventors: Tae Hoon KIM; Kyu Hyung DO; Byung Il CHOI; Yong Shik HAN; Ae Jung YOON; Hwa Long YOU - Web page: https://patentgrep.com/patent/US20250085244A1 ## CPC - G01N 25/18: by investigating thermal conductivity (by calorimetry G01N25/20; by measuring change of resistance of an electrically-heated body G01N27/18) - G01J 5/00: Radiation pyrometry, e.g. infrared or optical thermometry - G01J 5/60: using determination of colour temperature - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) ## Abstract The technology disclosed in the present specification is a method of evaluating insulation performance of a low-temperature storage tank, the method including an operation of transferring an internal electrode to a lower base material, wherein the operation includes: a first operation of measuring an amount of infrared energy of a sensor pad; a second operation of assuming a temperature of a substrate of the sensor pad as a specific value; a third operation of calculating a temperature of a first surface of the sensor pad by using the amount of the infrared energy measured from the sensor pad and the temperature of the substrate; a fourth operation of obtaining a temperature of the substrate from a transient heat conduction equation by using the temperature of the first surface as a boundary condition; a fifth operation of determining whether the obtained temperature of the substrate is equal to the assumed temperature of the substrate; and a sixth operation of, when the temperatures of the substrate are equal to each other, determining the calculated temperature of the first surface as a final temperature of the first surface and obtaining a value of heat flux infiltrating the low-temperature storage tank from the outside. ## Claims ### Claim 1 A method of evaluating insulation performance of a low-temperature storage tank, the method comprising: a first operation of measuring an amount of infrared energy of a sensor pad; a second operation of assuming a temperature of a substrate of the sensor pad as a first temperature value; a third operation of calculating a temperature of a first surface of the sensor pad by using the amount of infrared energy measured from the sensor pad and the first temperature value; a fourth operation of obtaining a second temperature value of the substrate from a transient heat conduction equation by using the temperature of the first surface as a boundary condition; a fifth operation of determining whether the first temperature value is equal to the second temperature value; and a sixth operation of, when the first temperature value is equal to the second temperature value, determining the calculated temperature of the first surface as a final temperature of the first surface and obtaining a value of heat flux infiltrating the low-temperature storage tank from the outside. ### Claim 2 (depends on 1) The method of claim 1, further comprising an operation of, when the first temperature value is not equal to the second temperature value in the fifth operation, changing the first temperature value and repeating the second to fifth operations. ### Claim 3 (depends on 1) The method of claim 1, wherein the operation of measuring the amount of the infrared energy of the sensor pad is performed with an infrared (IR) camera. ### Claim 4 (depends on 1) The method of claim 1, wherein the substrate of the sensor pad has an infrared transmittance of 95% or more and a thermal conductivity of 20 W/mK or less. ### Claim 5 (depends on 1) The method of claim 1, wherein the entire first surface of the sensor pad includes an infrared black coating, and a portion of the second surface of the sensor pad includes an infrared black coating. ### Claim 6 (depends on 5) The method of claim 5, wherein the infrared black coating has an infrared transmittance of 5% or less. ### Claim 7 A system for evaluating insulation performance of a low-temperature storage tank, the system comprising: a sensor pad attached to a low-temperature storage tank; an infrared measurement device configured to measure infrared energy of the sensor pad; and a processor, wherein the processor is configured to: receive an amount of the infrared energy measured from the sensor pad; and calculate a value of heat flux infiltrating the low-temperature storage tank from an outside by using the received amount of the infrared energy. ### Claim 8 (depends on 7) The system of claim 7, wherein the processor is further configured to: assume a temperature of a substrate of the sensor pad as a first temperature value; calculate a temperature of a first surface of the sensor pad by using the amount of the infrared energy and the first temperature value; determine a final temperature of the first surface by repeating the assuming and calculating operations until a temperature of the substrate calculated by using the calculated temperature of the first surface is equal to the first temperature value; and calculate the value of the heat flux from the final temperature of the first surface. ### Claim 9 (depends on 7) The system of claim 7, wherein the substrate of the sensor pad has an infrared transmittance of 95% or more and a thermal conductivity of 20 W/mK or less. ### Claim 10 (depends on 7) The system of claim 7, wherein the entire first surface of the sensor pad includes an infrared black coating, and a portion of the second surface of the sensor pad includes an infrared black coating. ### Claim 11 (depends on 10) The system of claim 10, wherein the infrared black coating has an infrared transmittance of 5% or less. ### Claim 12 A computer program for evaluating insulation performance of a low-temperature storage tank, the computer program comprising: a first instruction for measuring an amount of infrared energy of a sensor pad; a second instruction for assuming a temperature of a substrate of the sensor pad as a first temperature value; a third instruction for calculating a temperature of a first surface of the sensor pad by using the amount of infrared energy measured from the sensor pad and the first temperature value; a fourth instruction for obtaining a second temperature value of the substrate from a transient heat conduction equation by using the temperature of the first surface as a boundary condition; a fifth instruction for determining whether the first temperature value is equal to the second temperature value; and a sixth instruction for, when the first temperature value is equal to the second temperature value, determining the calculated temperature of the first surface as a final temperature of the first surface and obtaining a value of heat flux infiltrating the low-temperature storage tank from the outside. ### Claim 13 (depends on 12) The computer program of claim 12, further comprising an instruction for, when the first temperature value is not equal to the second temperature value in the fifth instruction, changing the first temperature value and repeating the second to fifth instructions. ### Claim 14 (depends on 12) The computer program of claim 12, wherein the amount of the infrared energy of the sensor pad is measured with an infrared camera. ### Claim 15 (depends on 12) The computer program of claim 12, wherein the substrate of the sensor pad has an infrared transmittance of 95% or more and a thermal conductivity of 20 W/mK or less. ### Claim 16 (depends on 12) The computer program of claim 12, wherein the entire first surface of the sensor pad includes an infrared black coating, and a portion of the second surface of the sensor pad includes an infrared black coating. ### Claim 17 (depends on 16) The computer program of claim 16, wherein the infrared black coating has an infrared transmittance of 5% or more.