JB/T 10379-2002 General determination method for thermal performance and fluid resistance characteristics of heat exchangers
Some standard content:
ICS23.020.30
Machinery Industry Standard of the People's Republic of China
JR/T10379-2002
General Test Methods for Determining Heat Transfer Performance and Flow Resistance of Heat Exchangers
Recommended Test Methods for Determining Heat Transfer Performance and Flow Resistance of Heat Exchangers Issued on December 27, 2002
Implemented on April 1, 2003
Issued by the State Economic and Trade Commission of the People's Republic of China Foreword
2 Normative Reference Documents
3 Symbols
4 Secondary System
Remaining Instruments.
5.1 Flow Measuring Instruments
Temperature Measuring Instruments
5.3 Pressure Drop Measuring Instruments,
|Product creation method requirements
Performance determination
1 Heat transfer performance:
7.2 Pressure drop
Invitation to explain,
Inspection report
Task source
Test date,
Test conditions
Test start time and personnel
Data processing,
Conclusion analysis
Liquid-liquid determination system
Gas determination system
Steam determination system research
Gas determination system…
Figure 5 Gas measurement system, temperature measuring instrument, pressure measuring instrument and static measuring hole JB/T t0379-2002 JB/T10379-2002 This standard is formulated by China Machinery Industry Association. Foreword This standard is issued by the Machinery Industry Chemical Machinery and Equipment Standard Promotion Technical Committee. This standard is initiated by Hefei General Machinery Research Institute. JB/T10379-2002 General determination method for thermal performance and fluid resistance characteristics of heat exchangers This standard specifies the determination method and test technical requirements for thermal performance and fluid resistance characteristics of heat exchangers. This standard is applicable to various types of heat exchangers, including tube heat exchangers, plate heat exchangers, plate heat exchangers, chillers, radiators, air coolers, oil coolers, cold blast devices, generators, marine heat exchangers, general-purpose auxiliary heat exchanger heat transfer elements (hereinafter referred to as "heat exchanger"):
The applicable test medium is liquid, gas, steam, gas-gas, gas-gas, and the medium used is hot and cold water, oil-cooled gas, and fuel gas.
2 Normative references
The clauses in the underlined documents are the clauses of this standard and are references to the date of issue. The revised version of this standard shall not apply. However, the parties involved in this standard shall study whether the original version of these documents shall apply. The date of issue shall not be noted, and the latest version shall apply to this standard. /262-993 said measuring the flow of the throttling device mesh or, slow and venturi tube state filled with kidney flow e1150 5167-1:19013
GBT15386-1994 Heat exchanger for cooling
G16409—1996 Heat exchanger for heating
B5095—1991 Performance test of heat exchanger for internal combustion engine JB/T69191993 Performance test method of heat exchanger for increasing rotation JBT7356-1994 Tubular pool cooler
JB8701—1998 Plate heat exchanger for refrigeration 3 Symbols
4--Heat transfer symbol, unit is m2:
Specific heat capacity of cold medium at constant pressure, unit is (·): Fpb
Specific heat capacity of hot medium at constant pressure, unit is (kgK):·Euler number:
Total heat transfer coefficient, unit is W/(m2-K):: Nucha =VPa; Pressure of the cold medium inlet, unit price is 1
Pressure of the cold medium outlet, unit is MPa:
Pressure of the hot medium inlet, unit is Pa: Pressure of the hot medium outlet, unit is VPa; Pressure barrier of the cold medium, unit is MPa
Production drop of the hot medium, unit is MPa:
Heat flow of the cold medium: unit is W:
Heat flow of the hot medium, unit is W:
Average heat transfer, unit is W;
Reynolds number:
JB/T10379--2002
Prandtl number:
S. Cold medium flow area, unit is m:5
Heat medium flow area, unit is m;
Cold medium
Temperature change at the inlet of the medium, in ℃;
Temperature at the outlet of the cold medium, in ℃;
Temperature at the inlet of the hot medium, in ℃;
Temperature at the outlet of the hot medium, in ℃;
Temperature difference at the whole, in ℃;
Temperature at the outlet of the hot medium, in ℃;
Volume flow rate of the cold medium, in mts;
Flow rate of the hot medium, in ms;
Cold medium velocity, in m/s;
Film heat transfer coefficient, in WI (m, K): - Density of the cold medium, in kgm:
Density of the hot medium, in ℃;
Latent heat of vaporization, in J/kg:
Specific volume of the vapor, in ml kg:
Relative error of heat balance, product:
Relative error of total heat transfer coefficient, customer,
4 Measurement system
4.1 The heat exchanger measurement system consists of a cold source, a heat source, a heat exchanger to be measured (hereinafter referred to as "test piece"), a cold and hot medium cooling system and test instruments.
4.1.1 Filter-concentrate measurement system See Figure 1:
Liquid to be tested: 2-
: 3: 4-
Test piece: 5-
-heater,
-wet or test-test
Figure 1 Liquid-liquid to determine the system
Cold and hot media pass through the test heat exchange point, and the hot medium is heated to the required temperature by the heater: the cold medium is cooled to the required temperature by the cooler or cooling tower, and then recycled.
4.1.2 Liquid-gas measurement system See 2.
A signal quantity
Wind environment mountain
rate engineering
room 2 liquid-gas measurement system
JB/F103792D02
welcome to the fixed equipment and wind lubrication system (these two parts are composed of dynamic water lubrication system and fan light system. The main design of the station engineer is to ensure the effectiveness of the required medium, and the test is completed to ensure the accuracy of the test equipment. It can also provide non-standard data:
4.1.3 Jun FAW system as shown in Figure 3
After the liquid and gas have passed the measured micro-operation, the cold The liquid is then overcooled in order to accurately measure the process: the cold medium is cooled by the cooler to reduce the required humidity and then used in this cycle.
4.1.4 Gas-to-gas measurement system (see Figure 4) The cold air system and the total air system in the measurement device are mostly composed of the whole device. After the installation of the whole device, the hot air system and the hot air system can detect leakage and abnormal phenomena in various parts of the road. 4.1.5 Gas-to-steam measurement system (see Figure 5): The air system and the hot steam system in the measurement device are composed of two parts, H and H. They all have quality treatment units and test requirements: The pre-treatment unit ensures that the gas and steam meet the test requirements The required data, test section to ensure the accuracy of the proposed test parameters 4? Technical requirements for measuring the speed of cold and hot media, temperature and pressure drop measurement 4.2.1 Flow plate measurement
Flow rate can be measured with a standard throttling device or other industry standard meter a) Use standard throttling device (orifice plate, mass increase) to measure the flow plate: The measurement method should comply with the provisions of GB2624-13: Use other flow meters according to the corresponding period of operation: 4.2.2 Temperature measurement
The diffusion measuring instrument must be installed in the first step to accurately measure the inlet and outlet temperature of the test piece: The temperature is measured to The line from the test piece to the inlet and outlet must be insulated: b
and the line three medium mountain laminar flow, the upstream of the temperature measuring instrument should be installed with a promotion device. The temperature sensing element must be placed in the center of the pipeline, see Figure d
4.2.3 Pressure barrier measurement
a) Static pressure measurement should be located away from any moving parts (diameter change, head: business door, etc.: downstream 5 supply pipe diameter, upstream 2 loan pipe diameter: 3
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JB/T103792002
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1--receiving auxiliary section. 2--changing section: 3--front test section: *--1 operation section: 5--rear test section: 6-receiving initial section. 7-measuring section: expansion section: 9--moisture damper [0 see machine: [--motor Figure 4 gas-gas measuring system
/10379-2002
1--meter plummet installation: 7--subcooler: 3--condensate tank; 4--test fiber: 5--air room: 6--carbon short pressure reading device: T--measured: pressure variable differential pressure measurement L
Figure 5 gas-gas measuring system
D real installation
installation at the net breeding head
National 6 temperature measuring rod installation
b) The pressure measuring hole should be perpendicular to the pipe wall, see Figure? Static measurement position There shall be no disturbance between the parts.
JB/T10379-2002
lIn addition to complying with the provisions of the water standard, the three-pressure drop measurement of the condenser shall also comply with the provisions of GBT15386-1994: the plate heat exchanger, condenser, and evaporator shall comply with the provisions of GB16-1019--1996 and m8701-1998: the condenser shall comply with the provisions of B/T5095-1991 and JB/73561994: the plate heat exchanger shall comply with the provisions of B/T6919-1993. Figure 7 Pressure ring and static pressure hole
JB/T10379-2002
5 Measuring instruments
All the instruments collected must be qualified by the statutory measurement and adjustment department and can be used within the validity period. 5.1 Flow meter
Standard throttling device or other flow meter with accuracy not less than 0.25% for measuring flow. 5.2 Temperature meter
5.2.1 Precision glass tidal meter or other temperature measuring instrument with accuracy not less than 0.25%: 5.2.2 Temperature (temperature difference) measuring instrument shall be directly or indirectly inserted into the medium through the protective cover. The liquid in the protective cover shall be a medium with high thermal conductivity, small heat capacity and not easy to be radiated
5.2.3 The measurement of temperature measuring instrument shall be corrected without deviation. 5.3 Pressure drop measuring instrument
Other pressure difference measuring instrument with accuracy not less than 13a or accuracy not less than U.25%. 6 Measurement method and requirements
6.1 Determination of the flow of dangerous and hot medium:
6! 6.3: First, make the flow rate of the medium on one side constant, and the flow rate of the medium on the other side should change within the maximum range. The number of measuring points for the fixed flow rate should be no less than 3 points, and the number of measuring points on the change value side should be no less than 6 points (relative to each fixed point). 6.4 Under the above conditions, after 5ma, perform 4 equal intervals of full heat collection, and take all the collected data The calculated average value of the data is used as the test value of this condition. 6.5 Specification requirements: The flow rate and temperature of these media should be in the specified working conditions. The deviation of each working point from the specified value during the test process shall not exceed V.5, and the flow rate shall not exceed 1 °C. Performance determination 7.1 Heat transfer 7.1.1 Determine the relationship between the total heat transfer coefficient and the flow rate W, that is, K = f (w): 7.1.2 Determine the relationship between the Nusselt number W and the fluid Reynolds number Re, that is, Wh = Ra, PR), M =
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