JB/T 5085-1991 Technical requirements for diesel engine water coolers
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB5085-91
Technical Conditions for Diesel Engine Water Cooler
Published on July 1, 1991
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Implemented on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Diesel Engine Water Cooler
1 Subject Content and Applicable Scope
This standard specifies the technical requirements, test methods and inspection rules for water coolers of small and medium-power diesel engines. This standard applies to seawater-cooled freshwater water coolers for small and medium-power diesel engines (hereinafter referred to as coolers). 2 Reference Standards
GB2828 Batch Inspection Count Sampling Procedure and Sampling Table (Applicable to Continuous Batch Inspection) 3 Terminology
Tube side: the channel on the inner side of the cooler water pipe (Figure 1 for the seawater side), shell side: the channel on the outer side of the cooler water pipe (Figure 1 for the freshwater side). Cooler core: a component composed of end plates, tube bundles, baffles, and fins. JB5085-91
Potential transfer coefficient: indicates the heat flux that can be transferred per [m* heat transfer surface when the temperature difference between the cold and hot media is 1C. Volume utilization coefficient: indicates the heat flux that can be transferred per 1m\ volume of the cooler core when the temperature difference between the cold and hot media is [C. Weight utilization coefficient: indicates the heat flux that can be transferred per 1kg weight of the cooler core when the temperature difference between the cold and hot media is 1C. Heat transfer fins
Figure 1 Water cooler structure
4.1 Products should be manufactured according to product drawings and technical documents approved by the prescribed procedures. Coolers used for marine diesel engines should comply with the regulations of the ship inspection department and be manufactured under its technical supervision. 4.2 The structural materials used in the cooler should be resistant to peeling corrosion in seawater, or covered with anti-tumor corrosion coating. During the specified service life of the cooler, the anti-corrosion layer should be intact.
JB5085-91
4.3 The structure of the cooler must ensure that it can be disassembled in time when the water pipe is compressed or blocked, and the heat dissipation core should be interchangeable to facilitate the cleaning of indoor sediments and scale.
4.4 Sealing performance of the cooler
The tube side and shell side of the cooler should be sealed, and no leakage should occur after an air pressure test of not less than 400kPa for 3 minutes and a water pressure test for 5 minutes.
4.5 Vibration resistance of cooler
The cooler vibrates continuously for 1.2 million times at 4 times the gravity acceleration (4,) and a frequency of 50Hz. Leakage and parts damage are not allowed.
The amplitude is determined according to formula (1):
Where: 9-gravity acceleration.9=9.81m/sf-frequency, Hz.
4.6 Heat transfer performance of cooler
4g×10#
The medium on the tube side and the shell side is clean water, and the flow rate of the medium on both sides is 0.7m/s. The inlet water temperature on the shell side is to:, which is determined according to the inlet water temperature (unheated clean water) on the tube side during the test. The temperature difference (a4) should be kept within the range of 50±1C. The main heat transfer performance of the cooler shall meet the following requirements:
Heat transfer coefficient K shall not be less than 1800W/(m*, K) 4.6.1
3600CCe(tosta), W
Wherein: 9.:
Heat release flow of hot water on the shell side, W:
Shell side inlet water temperature, ℃;
Shell side outlet water overflow, ℃
Specific heat capacity of hot water on the shell side, kJ/(kg·C)Ge=Vops,kg/h,
Volume flow rate of water on the shell side, m*/h;
Density of water on the shell side, kg/m*;
MLogarithmic mean temperature difference, C
Shell side heat transfer area, m,
Shell side heat transfer area F shall be calculated according to the provisions of Appendix A (Supplement). The logarithmic mean temperature difference % is calculated as follows:
for single pass channel cooler
for double pass channel cooler
% (b - ta) - (lo - )
in()
(ton - ta) - (tar
fon - fa
h + ta
4.6.2 Volume utilization coefficient K. Should not be less than 4×10*w/(m*·K). K,=
Where: V——Volume of cooler core, mJB5085—91
4.6.3 Quantity utilization coefficient K, should not be less than 300W/(kg·K)K,
Where:——Weight of cooler core, kg, 4.6.4 Shell side pressure difference AP. Should not be greater than 20kPa, 0
4.6.5 During the heat transfer performance test, the medium flow rate is calculated according to formula (5) and (6). Filling side medium flow rate
We3600s
Tube side medium flow rate
Where; V. —Volume flow rate of water on the shell side, m /h, V,—Volume drop of water on the tube side, m/h
S. Shell side channel area, m
S,—Tube side channel area, m
The shell side channel area and the tube side channel area shall be calculated in accordance with the provisions of Appendix B (Supplement). (4)
4.7 The connection between the cooler core tube and the two end plates shall be expanded. Brazing and welding are allowed when the life indicators specified in this standard are met.
4.8 There shall be no welding spatter, acid-etched salt deposits, and flux residues left after brazing on the cooler parts. 4.9 When manufacturing the cooler, the pipe flow cross-section shall not be reduced due to the pressure surface of the pipe end, and the pipe itself shall not be blocked due to defects (the pipe should be firmly fixed at both ends). Solid blockage), the number of blocked tubes should not exceed 1% of the total number of tubes. 4.10 The seawater inlet of the cooler should be equipped with a zinc plug to relieve component wear. 5 Test method
5.1 On the sealing test bench, submerge the cooler in the water grid, and introduce dry compressed air with a pressure of 400kPa to the tube side or shell side for 3 minutes. No air bubbles should appear.
When the cooler is checked for sealing by water pressure, the water pressure is 400kPa for 5 minutes. There should be no stagnant water, dripping or pressure reduction during pressurization. After the test, the residual water in the cooler chamber should be removed. 5.2 Perform a vibration test on the vibration test bench according to the working conditions specified in Article 4.5. 5.3 On the heat transfer performance test bench, perform according to the provisions of Article 4.6 Conduct heat transfer performance test, control the thermal balance error within the range of 5%, measure the heat flow Qi, and then calculate K according to formula (2), calculate K according to formula (3), and calculate K according to formula (4). During the heat transfer performance test, the shell side pressure difference AP is measured at the same time. 6 Acceptance rules 6.1 Products must be inspected and qualified by the quality inspection department of the manufacturer before they can leave the factory. 6.2 When the ordering unit randomly inspects the products, it shall be inspected and accepted according to GB2828 or the acceptance rules agreed by both parties. 7 Marking, packaging, transportation and storage 7.1 Marking 7.1.1 The product shall be marked with: a. Manufacturer name or trademark; b. Product model and name; and b. Date of production or factory number.
JB5085—91
7.1.2 The marking shall comply with the product drawings approved by the prescribed procedures, and the marking shall be intact during the entire use of the product. 7.2 Packaging
7.2.1 The water inlet and outlet shall be covered to prevent dirt from entering the cooler cavity. 7.2.2 Products used as spare parts or for long-distance transportation shall be packaged. 7.2.3 The packaging method shall ensure that the product is not damaged during transportation and storage. The packing box shall be accompanied by a packing list signed and stamped by the manufacturer's packer. The packing list shall indicate the product name, model, quantity and packing date. 7.2.4
The packing box shall be accompanied by a product certificate and instruction manual signed and stamped by the manufacturer's quality inspector. The certificate shall indicate: manufacturer's name or factory logo:
product name and model;
factory date or factory number.
The packaging box should be marked with:
Manufacturer name and address:
Product name and model:
Quantity and total weight of the packaging box,
Overall dimensions:
Date of production.
7.3 Transportation
A well-packaged cooler should be allowed to be transported by any normal method. 7.4 Storage
The cooler should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the cooler will not rust within 12 months from the date of leaving the factory.
Shell side heat transfer area
The tube side heat transfer area is calculated according to formula (A1):
Where: 4—Inner diameter of heat pipe, m
JB5085-91
Appendix A
Calculation method of heat transfer area
(Supplement)
F = nd,La.
L-Length of the heat dissipation part of the heat pipe, m
——Heat pipe measurement,
A2 Filling heat transfer area
The shell side heat transfer area is composed of the bare pipe area F of the heat pipe and the area of the heat sink welded on the bare pipe F (excluding the area of the baffle assembled on the bare pipe).
The bare pipe area of the heat sink is calculated according to formula (A2): FundeLet
wherein; d-—outer diameter of the heat sink, m,
The area of the heat sink (see Figure A1) is calculated according to formula (A3): Figure A1 Heat sink
JB5085-91
F=2CR-(LR—C,R+C）-
wherein: R Heat sink radius, m:
L—arc length of heat sink AB, m
\, chord length of heat sink AB.m
4—highest point of heat sink AB, m
*. Number of heat sink heat sink holes;
V—number of heat sinks.
The heat transfer area on the shell side is calculated according to formula (A4):
F,=Fo+Fe,
A3 Calculation example
6]Calculation of the heat transfer surface of 35CaB water cooler, known parameters:
Inner diameter of heat pipe: 4=6×10-m
Outer diameter of heat pipe: 4=7×10-\m;
Length of heat pipe heat dissipation part: L=0.335m Number of heat pipes: % =132;
Radiator radius: R=63×10~m
Radiator 4B height: =33×10-m
Radiator AB length: L=135.4×10-*m; Radiator AB chord length: e, 111×10-m;
Number of radiator fins: N=13;
Number of radiator heat pipe holes R=86;
Tube side heat transfer area,
F, =d,Ln
=×6×10×0.335×132
0.8331.m2
Bright heat transfer area:
Fe=Fo+Fes
Fande La
#×7×10×0.335×132
=0.9720m2
Fe=2[aR-(LR-C R+C,h)-
=2((63×10)(135. 4×10×63×10111×10× 63×10~+I11×10×33×10)
=0.1029m2
a×(7×10-*)*×86j×13
Fa=Fo:+P0.9720+0.1029=1.0749m26
..(A3)
·(A1)
508591
Appendix B
Calculation of channel area
(supplement)||tt ||The calculation method for determining the channel area on the shell and tube sides of the cooler shall be carried out in accordance with the following provisions. The channel area S on the tube side is calculated according to formula (B1):
Where: d, the inner diameter of the tube, m.
B2 Channel area on the shell side
adtw,
The medium flows through the tube bundle outside the tube, and the channel area it flows through is not a constant. This standard stipulates that the area of the small channel of the fluid passing through the tube bundle section is the channel area on the outside of the cooler tube. According to Figure A1 Determine different c and various data, calculate the corresponding areas according to formula (B2) and fill in table B!, the smallest channel area is the side channel area S. S, (cfad,) b,
In the formula: c--the length of the heat sink along the center line of each row of tube holes, m;
bu--the number of tube holes on the heat sink in the center line of each row of tube holes: do-\outer diameter of the water pipe. m,
B3 Calculation Example
4135C Calculation of the channel area of aB water cooler (sea water on the tube side and fresh water on the shell side), known parameters:
Radiator radius: R=63×10*m:
Radiator AB arc height: 4,33×10-\m; Radiator AB arc length, L,=0.135m
Radiator 4B chord length: c,=0.11m,
The medium on the tube side first enters the 39 tube bundles and then turns back by the 54 tubes, and then flows out from the 39 tubes. The tube side channel area is:
a(6 × 10-) × 39
=1.1027×101m
Shell side channel area According to formula (B2), the channel area of each row of tubes is calculated and listed in Table B1. It can be seen from the table that the shell side channel area of 11 tubes in the second row of heat dissipation tubes is the smallest.
S,(cde)5
=(117.311×7)×10-1×28×10-=1.128×10-m2
Continue the sequence number
Additional instructions:
JB5085—91
This standard is proposed and managed by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Chen Daneng.
1.142×10-
1.128×10-
1.467×10-
1.350×10-
1. 176×10-*(A3)
·(A1)
508591
Appendix B
Calculation of channel area
(Supplement)
The calculation method for determining the channel area on the shell and tube sides of the cooler shall be carried out in accordance with the following provisions. Channel area S on the tube side,
The channel area S on the tube side is calculated according to formula (B1):
Where: d, the inner diameter of the tube, m.
B2 Channel area on the shell side
adtw,
The medium flows through the tube bundle outside the tube, and the channel area it flows through is not a constant. This standard stipulates that the area of the small channel of the fluid passing through the tube bundle section is the channel area on the outside of the cooler tube. According to Figure A1, determine different c and various data, calculate the corresponding areas according to formula (B2) and fill in Table B!, and the smallest channel area is the channel area S on the shell side. S,(cfad,)b,
Where: c--the length of the heat sink along the center line of each row of tube holes, m; m--the distance between two heat sinks, m;
buy--the number of tube holes on the heat sink in the center line of each row of tube holes; do--the outer diameter of the water pipe, m,
B3 Calculation example
4135CaB Calculation of the channel area of a water cooler (seawater on the tube side and fresh water on the shell side) , known parameters:
Radiator radius: R=63×10*m:
Radiator AB arc height: 4,33×10-\m; Radiator AB arc length, L,=0.135m
Radiator 4B chord length: c,=0.11m, bzxZ.net
The medium on the tube side first enters the 39 tube bundles and then turns back by the 54 tubes, and then flows out from the 39 tubes. The tube side channel area:
a(6 × 10-) × 39
=1.1027×101m
Shell side channel area According to formula (B2), the channel area of each row of tubes is calculated and listed in Table B1. It can be seen from the table that the shell side channel area of 11 tubes in the second row of heat dissipation tubes is the smallest.
S,(cde)5
=(117.311×7)×10-1×28×10-=1.128×10-m2
Continue the sequence number
Additional instructions:
JB5085—91
This standard is proposed and managed by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Chen Daneng.
1.142×10-
1.128×10-
1.467×10-
1.350×10-
1. 176×10-*(A3)
·(A1)
508591
Appendix B
Calculation of channel area
(Supplement)
The calculation method for determining the channel area on the shell and tube sides of the cooler shall be carried out in accordance with the following provisions. Channel area S on the tube side,
The channel area S on the tube side is calculated according to formula (B1):
Where: d, the inner diameter of the tube, m.
B2 Channel area on the shell side
adtw,
The medium flows through the tube bundle outside the tube, and the channel area it flows through is not a constant. This standard stipulates that the area of the small channel of the fluid passing through the tube bundle section is the channel area on the outside of the cooler tube. According to Figure A1, determine different c and various data, calculate the corresponding areas according to formula (B2) and fill in Table B!, and the smallest channel area is the channel area S on the shell side. S,(cfad,)b,
Where: c--the length of the heat sink along the center line of each row of tube holes, m; m--the distance between two heat sinks, m;
buy--the number of tube holes on the heat sink in the center line of each row of tube holes; do--the outer diameter of the water pipe, m,
B3 Calculation example
4135CaB Calculation of the channel area of a water cooler (seawater on the tube side and fresh water on the shell side) , known parameters:
Radiator radius: R=63×10*m:
Radiator AB arc height: 4,33×10-\m; Radiator AB arc length, L,=0.135m
Radiator 4B chord length: c,=0.11m,
The medium on the tube side first enters the 39 tube bundles and then turns back by the 54 tubes, and then flows out from the 39 tubes. The tube side channel area:
a(6 × 10-) × 39
=1.1027×101m
Shell side channel area According to formula (B2), the channel area of each row of tubes is calculated and listed in Table B1. It can be seen from the table that the shell side channel area of 11 tubes in the second row of heat dissipation tubes is the smallest.
S,(cde)5
=(117.311×7)×10-1×28×10-=1.128×10-m2
Continue the sequence number
Additional instructions:
JB5085—91
This standard is proposed and managed by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Chen Daneng.
1.142×10-
1.128×10-
1.467×10-
1.350×10-
1. 176×10-*
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