This standard stipulates that the unit of heat in my country is joule, which is applicable to the fields of science, engineering technology, culture and education, production and economic management. GB 2586-1991 Heat unit, symbol and conversion GB2586-1991 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Unit , symbol and conversionsectors of heat
Subject content and scope of application
GB 2586-- 91
This standard stipulates that the unit of heat in my country is joule, which is applicable to the fields of science, engineering technology, culture and education, production and economic management. 2 Referenced standards
GB3102.4 Thermal quantities and units
3 Units and symbols
3.1 According to the "Order on the Unified Implementation of Legal Measurement Units in my country" promulgated by the State Council on February 27, 1984, the "Measurement Law of the People's Republic of China" effective on July 1, 1986 and the provisions of GB3102.4 implemented nationwide on March 1, 1987, the unit of energy, work and heat is joule (ear), and the unit symbol is J. The unit of temperature is the thermodynamic temperature unit Kelvin}, and the unit symbol is K. 3.2 The definition of the heat, work and energy unit joule (abbreviated as joule, symbol J) is: the work done by a force of 1 Newton acting on a particle to move it a distance of 1 meter in the direction of the force is called 1 joule. Note: ① 1 Newton = 1 kilogram·meter/second2 (1N=1kg·m/s2). ② Joule can also be defined by electrical units: that is, the electrical energy consumed by a current of 1 ampere in a resistor of 1 ohm in 1 second is called 1 joule. The joule defined in this way is exactly the same as the joule defined by the Newton·meter mentioned above (see Appendix A, Article A2). 3.3 The definition of the thermodynamic temperature unit Kelvin (abbreviated as K, symbol K) is: The thermodynamic temperature unit Kelvin (K) is 1/273.16 of the thermodynamic temperature of the triple point of water. 4 Conversion
For the conversion between the international steam calorie and the joule, which was used in my country in the past, the following formula is used: 1 international steam calorie = 4.1868 joule.
Energy unit conversion is shown in the following table:
Approved by the State Bureau of Technical Supervision on January 29, 1991 and implemented on December 1, 1991
Kilogram-force meter
kgf m
dry watt-hour
metric horsepower-hour
international steam surface dry calorie
kcalit
thermochemical dry calorie
kcaltn
20℃ kilocalorie
kcalzo
15℃ kilocalorie
kcalis
British thermal unit
kilogram-force-meter
kilowatt-hour
metric horsepower-hour
international steam surface dry calorie
thermochemical dry calorie
20℃ kilocalorie
kcal2o
15℃ kilocalorie
kcalisbzxz.net
British thermal unit
rx10-7
2. 647 796 ×106
4.1868×103
4. 184× 103
1. 181 6×103
4. 185 5×103
GB 2586--91
Energy unit conversion table
Kilogram-force·meter
kgf·m
0. 101 971 6
1.019716×10-8
3. 670 978 X 103
+4. 269 348×102
4. 266 493X 102
4. 264 0×102
4. 268 0×102
International Steam Surface Dry Calories
(kcalin）
Thermochemical Dry Calories
(kcalun）
2.388459×10-2.390057×10-4
2. 342 278X 10-3
2. 343 846× 10-3
1X10°
9. 806 65 × 107
3.6×1013
2. 647 796 ×1013
1. 186 8×1010
A4. 184X1010
4. 181 6×1010
4.1856×1010
1. 055 06 345 2X 10-3
12.390057×10-1
2. 388 459X10
8.598452×102
6. 324 151 X102
0. 999 331 2
2. 519 97X 10-1
8.604206×102
6. 328 382X 102
1. 000 669
2.3914×10-1
8. 609 1× 102
6.332 0X102
kilowatt-hour
metric horsepower\). 707 778X 161 6×10-3
1.162 6 × 10-3 | 1×102
6. 326 1X102
1. 579 3× 10-3
1. 580 7×10-3
3. 984 67 14X10-1
9. 294 89 X 10-3
9.47814×10-1
3. 412 13X103
2. 509 62 X 103
2.52307×10-2.52075×10-
2. 521 65×10-1
Note: 1) Horsepower is a mistranslation. The original text is horsepower. 2) 15℃ dry calories, that is, the heat required to raise the temperature of 1 kg of pure water from 14.5℃ to 15.5℃ under standard atmospheric pressure. 18
A1 The significance of promoting the International System of Units
GB 2586 - 91
Appendix A
Heat units, symbols and conversion instructions
(Supplement)
The use of joule as a heat unit plays a positive role in scientific and technological work, industrial and agricultural production, national defense construction, cultural education, medicine and health, publishing, and domestic and foreign trade. It can eliminate the confusion caused by the coexistence of multiple units and units, and save a lot of manpower and material resources. The use of the international system of units, the joule, is very beneficial to ensure the accurate and consistent transmission of calorimetric standard values. It not only eliminates the confusion caused by different units, but also reduces the trouble of a lot of calculations and conversions. The use of joule as a heat unit is more accurate than the calorie as a heat unit, because the accuracy of electric energy measurement is higher than that of water specific heat measurement. In 1969, the International Committee for Weights and Measures recommended the abolition of the calorie as a heat unit. A2 Explanation of various calories
15C calorie (symbol Cal15)
15℃ calorie is the amount of heat required to raise the temperature of 1 gram of pure water from 14.5℃ to 15.5℃ under standard atmospheric pressure. 20C calorie (symbol Cal20):
20C calorie is the amount of heat required to raise the temperature of 1 gram of pure water from 19.5℃ to 20.5℃ under standard atmospheric pressure. 120℃ calorie = 4.1816 Joules
International Steam Calories (symbol Cali):
International Steam Calories were defined at the Fifth International Steam Conference in London in 1956. The relationship between International Steam Calories and Joules is: 1 International Steam Calories = 4.1868 Joules
Thermochemical Calories (symbol Caln):
Between 1910 and 1948, considering people's habit of using calories in the past, the name of calories was retained and artificially defined how many joules 1 calorie equals, but it was no longer related to the specific heat of water, so it was called thermochemical calorie, "dry" calorie or specified calorie. 1 thermochemical calorie = 4.1840 Joules
A3 Relationship between Celsius temperature and thermodynamic temperature t = T - 273. 15
Where: t-Celsius temperature, C;
T-—thermodynamic temperature, K.
The unit "Celsius" symbol ℃) is equal to the unit "Kelvin". Therefore, temperature intervals or temperature differences can be expressed in both Kelvin and Celsius.
Additional notes:
This standard is proposed by the State Planning Commission, the National Bureau of Statistics, and the Standards Department of the State Administration of Technical Supervision. This standard is under the jurisdiction of the National Energy Basics and Management Standardization Technical Committee. This standard is revised by the China Institute of Standardization and Information Classification and Coding and the Institute of Engineering Thermophysics of the Chinese Academy of Sciences. 19
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