CN113282870A - Pipeline thickness calculator - Google Patents
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- CN113282870A CN113282870A CN202110552383.3A CN202110552383A CN113282870A CN 113282870 A CN113282870 A CN 113282870A CN 202110552383 A CN202110552383 A CN 202110552383A CN 113282870 A CN113282870 A CN 113282870A
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Abstract
The invention discloses a pipeline thickness calculator, which comprises the following pipeline thickness calculation systems: the system comprises an air conditioner chilled water supply (return) system, an air conditioner heating water supply (return) system, a heating and domestic hot water primary side system, a multi-split refrigerant pipe system, a water supply and drainage system, an air conditioner air supply pipe, a return air pipe, a fresh air pipe, a smoke exhaust air pipe and a kitchen oil exhaust air pipe system. The invention redesigns a pipeline thickness calculator by improving the pipeline thickness calculation method in the prior art, and the calculation method of the calculator can be used for calculating the thicknesses of different pipeline systems in a targeted manner, thereby greatly improving the accuracy of calculation data, effectively reducing the deviation of calculation results and enabling the obtained calculation results to be more scientific.
Description
Technical Field
The invention relates to the technical field of pipeline calculation, in particular to a pipeline thickness calculator.
Background
A pipeline is a device for transporting a gas, liquid or fluid with solid particles, connected by pipes, pipe couplings, valves, etc. Generally, a fluid is pressurized by a blower, a compressor, a pump, a boiler, etc., and then flows from a high pressure portion to a low pressure portion of a pipe, or is transported by the pressure or gravity of the fluid itself. The use of pipelines is very widespread, mainly in water supply, drainage, heating, gas supply, long-distance oil and gas delivery, agricultural irrigation, hydraulic engineering and various industrial installations.
After the pipeline is produced and processed, the thickness of the pipeline needs to be calculated so as to be suitable for different use occasions. Common nondestructive pipeline thickness calculation methods in the market at present include an ray method, an ultrasonic method, an eddy current detection method and the like. However, most of the existing pipeline thickness calculation methods can only perform thickness material calculation on standard pipes, and cannot perform thickness calculation on different pipeline heat insulation systems in a targeted manner, so that the calculated data generate deviation, the accuracy of the calculation result is affected, and the redesign of the pipe thickness calculation method is urgently needed.
Disclosure of Invention
The invention provides a pipeline thickness calculator, which aims to overcome the defects that the pipeline thickness calculation method in the prior art can only carry out thickness material on a standard pipe and cannot carry out thickness calculation on different pipeline heat-insulating systems in a targeted manner, so that the calculated data generate deviation, the accuracy of the calculation result is influenced and the like. The pipeline thickness calculator has the characteristics of reasonable flow design, scientific calculation method, strong pertinence, accurate calculation result, small deviation and the like, and can be used for calculating the thicknesses of different pipeline heat-insulating systems.
In order to achieve the purpose, the invention provides the following technical scheme: a pipe thickness calculator comprising the pipe thickness calculations of the following systems:
the calculation process of the air conditioner chilled water supply (return) system comprises the following steps:
firstly, a formula is selected by calculation: (economic calculation)
Selecting parameters and selecting basis:
(1) energy price (Yuan/GJ), PESelecting 75 yuan/GJ according to GB50736-2012 appendix K, wherein the repayment is 6 years, the rewarding is 10%, the using days are 120 days, and the repayment is taken at 2880 hours, because the heat prices selected in the urban heat supply pipe network and the gas heat supply are different, the urban central heat supply gas is 85 yuan/KJ, the urban heat supply is 35 yuan/KJ, and the heat prices are different in heat preservation economic thickness selection;
(2) selecting the heat-insulating material according to lambda of heat supply of fuel gas, selecting the heat-insulating coefficient lambda of rubber and plastic at 40 ℃ to be less than or equal to 0.040W/(m.K) according to the requirement of chapter 28 of the second part of technical specification, and selecting the heat-insulating material according to actual selection;
(3) the annual running time t is taken according to 120 days and 2880 hours, can be selected according to the design requirements of design units, and can also be selected according to GB50736-2012 appendix K;
(4)T0the temperature of the outer surface of the pipeline is the lowest temperature T of the medium in long-term operation0The method comprises the following steps that (1) when the temperature of the outer surface of a heat-insulating layer is 7 ℃, the temperature of the outer surface of the heat-insulating layer is 60 ℃, the temperature of the outer surface of a cold-insulating layer is +0.3 ℃ at the position, the temperature of the outer surface of a pipeline in the operation process is also selected according to a design instruction and an actual form in the system operation process, the temperature is confirmed in a manual input mode, when a lining pipeline is adopted, the temperature of the outer surface of the pipeline needs to be selected through calculation, when a lining is not adopted, the temperature of a medium in normal operation is selected, and when the lining is adopted, the temperature is selected through calculation;
(5)Tataking T as the ambient temperatureaWhen the temperature of the outer surface of the pipeline is 80 ℃, the temperature of the environment is 20 ℃; when the surface temperature is 81-110 ℃, the environmental temperature is 30 ℃; when the temperature of the outer surface is greater than or equal to 110 ℃, the environmental temperature is 40 ℃; taking the soil temperature during direct burial;
(6) economic thickness heat preservation calculation alphasSelecting heat release coefficient alpha of the external surface area of the heat insulation layer according to a 08K507 atlass11.63W/square meter K, the heat release coefficient of the outer surface of the heat-insulating layer is selected from 11.63 in the room, and the scald preventing effect is achieved8.141 is selected during calculation and anti-condensation calculation, the unit cost of the heat insulation layer structure is selected according to the atlas 08K507 or the cost is selected according to the actual price (including related loss and a protective layer), the heat insulation thickness is increased when the price is selected to be too low, and the heat insulation thickness is smaller when the price is selected to be too high;
(7)PTunit cost of heat insulation structure, selecting P according to 08K507T3700 yuan/m3；
(8) S, thermal insulation engineering annual amortization rate, selecting 6 years of repayment and 10% of profit according to the atlas, and calculating to obtain 23% of S;
thirdly, calculating the outer diameter of the pipeline
Selecting the outer diameter of the pipeline according to the GB/T-3091 welded steel pipe for low-pressure fluid transportation as follows:
DN 20-external diameter 26.9mm, DN 25-external diameter 33.7mm
DN 32-outer diameter 42.4mm, DN 40-outer diameter 48.3mm
DN 50-outer diameter 60.3mm, DN 65-outer diameter 76.1mm
DN 80-external diameter 88.9mm, DN 100-external diameter 114.3mm
DN 125-outer diameter 139.7mm, DN 150-outer diameter 168.3mm
DN 200-external diameter 219.1mm, DN 250-external diameter 273mm
DN 300-external diameter 325mm, DN 350-external diameter 377mm
DN 400-outer diameter 426 mm;
fourthly, calculating the thickness by adopting the economical heat preservation method as follows:
DN20 finding out delta 25.00mm
DN25 finding out delta being 26.07mm
DN32 finding out delta 27.28mm
DN40 finding out delta 27.94mm
DN50 finding out delta 29.00mm
DN65 finding out delta 30.17mm
DN80 finds out that delta is 30.63mm
DN100 found that delta is 31.35mm
DN125 solves the problem that delta is 32.69mm
DN150 found that delta is 32.82mm
DN200 found δ 34.18mm
DN250 finds out delta 35.49mm
DN300 found that delta is 36.97mm
DN350 obtaining delta 35.53 mm;
checking and calculating by adopting anti-condensation heat preservation, wherein the calculated heat preservation thickness is as follows:
DN20 finds out delta 22.38mm
DN25 finding out delta 23.44mm
DN32 finding out delta 24.39mm
DN40 finding out delta 24.80mm
DN50 finding out delta 25.67mm
DN65 finding out delta 26.71mm
DN80 finding out delta 27.16mm
DN100 found that delta is 28.23mm
DN125 finds out delta being 28.60mm
DN150 finds out that delta is 29.54mm
DN200 found that delta is 29.91mm
DN250 finds out delta 30.17mm
DN300 finds out that delta is 30.63mm
DN350 obtaining delta-30.63 mm;
in conclusion, the heat preservation thickness of the chilled water supply (return) pipe of the air conditioner is selected as follows:
DN20 choosing delta-30 mm
DN25 choosing delta-30 mm
DN32 choosing delta-30 mm
DN40 choosing delta-30 mm
DN50 choosing delta-30 mm
DN65 choosing delta-32 mm
DN80 choosing delta-32 mm
DN100 selects delta-32 mm
DN125 chooses delta-40 mm
DN150 selects delta-40 mm
DN200 selects delta-40 mm
DN250 selects delta-40 mm
DN300 selects delta-40 mm
DN350 selects delta as 40 mm;
the air-conditioning heating water supply (return) system comprises the following steps:
firstly, a formula is selected by calculation: (economic calculation)
Selecting parameters and selecting basis:
(1) energy price (Yuan/GJ), PESelecting according to GB50736-2012 appendix K when the difference is 85 yuan/GJ, wherein the repayment is 6 years, the rewarding is 10%, the using day is 120 days, and the repayment is taken at 2880 hours, because the heat prices selected in the heat supply by adopting the urban heat supply pipe network and the gas are different, the urban central heat supply gas is 85 yuan/KJ, the urban heat supply is 35 yuan/KJ, and the heat price is different from the heat preservation economical thickness;
(2) selecting the heat-insulating material according to lambda of heat supply of fuel gas, selecting the heat-insulating coefficient lambda of rubber and plastic at 40 ℃ to be less than or equal to 0.040W/(m.K) according to the requirement of chapter 28 of the second part of technical specification, and selecting the heat-insulating material according to actual selection;
(3) the annual running time t is taken according to 120 days and 2880 hours, can be selected according to the design requirements of design units, and can also be selected according to GB50736-2012 appendix K;
(4)T0the temperature of the outer surface of the pipeline is the lowest temperature T of the medium in long-term operation 060 ℃, selecting 60 ℃ for the temperature of the outer surface of the heat-insulating layer, selecting the dew point temperature of the place +0.3 ℃ for the temperature of the outer surface of the cold-insulating layer, selecting the temperature of the outer surface of the pipeline in the operation process according to the design specification and the actual form in the system operation process, and confirming the temperature by adopting a manual input form, wherein when the pipeline with lining is adopted, the temperature of the outer surface of the pipeline needs to be selected by calculation, when the lining is not adopted, the temperature of the medium in normal operation is selected, and when the lining is adopted, the temperature is selected by calculation;
(5)Tataking T as the ambient temperaturea＝20℃In calculating the heat insulation thickness of outdoor pipeline trench laying, the annual value of the environment meets the following regulations, and when the temperature of the outer surface of the pipeline is 80 ℃, the environment temperature is 20 ℃; when the surface temperature is 81-110 ℃, the environmental temperature is 30 ℃; when the temperature of the outer surface is greater than or equal to 110 ℃, the environmental temperature is 40 ℃; taking the soil temperature during direct burial;
(6) economic thickness heat preservation calculation alphasSelecting heat release coefficient alpha of the external surface area of the heat insulation layer according to a 08K507 atlassThe heat insulation layer structure is characterized in that 11.63W/(. square meter. K) is selected, the heat release coefficient of the outer surface of the heat insulation and cold insulation layer is selected indoors to be 11.63, 8.141 is selected during scald prevention calculation and dew prevention calculation, the unit cost of the heat insulation layer structure is selected according to 08K507 of an atlas or the cost after the actual price (including related loss and a protective layer) is selected, the heat insulation thickness is increased when the price is too low, and the heat insulation thickness is smaller when the price is too high;
(7)PTunit cost of heat insulation structure, selecting P according to 08K507T3700 yuan/m3；
(8) S, thermal insulation engineering annual amortization rate, selecting 6 years of repayment and 10% of profit according to the atlas, and calculating to obtain 23% of S;
(9) k safety factor, which is selected to be in a value range of 1.2-1.4 according to the specification, is calculated according to the K value of 1.3, and regarding the K safety factor, the K safety factor is generally selected to be 1 in the economic calculation of heat preservation and cold preservation, and the K safety factor is selected to be 1.1-1.4 in the condensation prevention, and the K safety factor is determined according to the property of the material;
thirdly, calculating the outer diameter of the pipeline
Selecting the outer diameter of the pipeline according to the GB/T-3091 welded steel pipe for low-pressure fluid transportation as follows:
DN 20-external diameter 26.9mm, DN 25-external diameter 33.7mm
DN 32-outer diameter 42.4mm, DN 40-outer diameter 48.3mm
DN 50-outer diameter 60.3mm, DN 65-outer diameter 76.1mm
DN 80-external diameter 88.9mm, DN 100-external diameter 114.3mm
DN 125-outer diameter 139.7mm, DN 150-outer diameter 168.3mm
DN 200-external diameter 219.1mm, DN 250-external diameter 273 mm;
fourthly, calculating the thickness by adopting the economical heat preservation method as follows:
DN20 finding out delta 24.34mm
DN25 finding out delta 25.44mm
DN32 finding out delta 26.71mm
DN40 finding out delta 27.29mm
DN50 finding out delta 28.49mm
DN65 finding out delta 29.68mm
DN80 finding out delta 30.23mm
DN100 found that delta is 31.43mm
DN125 found delta 32.13mm
DN150 found that delta is 33.66mm
DN200 found that delta is 33.96mm
DN250 finds out delta 34.81mm
DN300 found that delta is 35.75m
DN350 obtaining delta 35.82 mm;
adopting the heat loss prevention check to calculate the heat preservation thickness as follows:
DN20 finding out delta 6.46mm
DN25 finds out that delta is 6.74mm
DN32 finding out delta 6.89mm
DN40 finding out delta 7.00mm
DN50 finding out delta 7.09mm
DN65 finding out delta 7.23mm
DN80 found that delta is 7.33mm
DN100 found that delta is 7.43mm
DN125 found that delta is 7.33mm
DN150 found that delta is 7.99mm
DN200 found that delta is 7.67mm
DN250 finds out delta 7.51mm
DN300 found that delta is 7.31mm
DN350 obtaining delta 7.54 mm;
sixthly, the heat preservation of the air-conditioning heating water supply (return) pipe is selected to have the following thickness:
DN20 choosing delta-30 mm
DN25 choosing delta-30 mm
DN32 choosing delta-30 mm
DN40 choosing delta-30 mm
DN50 choosing delta-30 mm
DN65 choosing delta-30 mm
DN80 choosing delta-32 mm
DN100 selects delta-32 mm
DN125 chooses delta-40 mm
DN150 selects delta-40 mm
DN200 selects delta-40 mm
DN250 selects delta-40 mm
DN300 selects delta-40 mm
DN350 is delta-40 mm.
Preferably, for a heating and domestic hot water primary side system (the water temperature of a pipeline is more than 60), selecting the middle thickness of the heat-insulation thickness and a heat-insulation requirement table (continuation) in the eighteenth chapter of chart of the technical specification specifications of an electromechanical system, namely DN50 and the following prefabricated rigid glass fiber heat-insulation pipe section with the thickness of 40mm after calculating according to the economical thickness and the heat loss of the pipeline; DN 70-DN 300 are selected from the thermal insulation thickness of 50mm, DN350 and above thermal insulation thickness of 60 mm.
Preferably, for the heat preservation of the pipeline of the multi-connected refrigerant pipe system, the density of the rubber plastic closed-foam heat-insulation material is 40-64 kg/m according to the technical specification requirements3The heat conductivity coefficient K is less than or equal to 0.040(W/(m DEG C)), and as for the safety coefficient K, 1 is generally selected in the economic calculation of heat preservation and cold preservation, the selection in the anti-condensation is 1.1-1.4, the specific selection is determined according to the material properties, the heat conductivity coefficient of the heat insulating layer is selected according to the corresponding numerical value in the design instruction or the drawing set, the manual input mode is adopted for determination, the calculation is carried out by adopting the single-layer heat preservation consideration, in the range of the heat preservation density and the heat conductivity coefficient of the refrigerant pipeline required by 07K506 < design and construction installation of multi-split air conditioner system >, according to the 11.6 provisions of the drawing set, when the outer diameter of the copper pipe is phi 6.35-phi 25.4, the thickness of the heat insulation is recommended to be 10 mm; when the outer diameter is phi 28.6-phi 41.3, the recommended heat insulation thickness is 15mm, and a multi-split system is a common heat insulation thickness meter because no related parameters and different refrigerant forms exist.The method is based on the provision of equipment manufacturers.
Preferably, the heat preservation thickness of the water supply and drainage pipeline comprises the following two aspects:
(1) and calculating the heat preservation thickness of the hot water supply and return pipelines:
through economic heat preservation calculation and heat loss heat preservation thickness check calculation, the heat preservation thickness of the hot water pipeline is selected to meet the requirements of section 5.2.2 of the technical specification book of electromechanical systems-water supply and drainage systems, and the thicknesses are selected as follows: branch pipe behind hot water pipeline, the return water pipeline of all furred ceilings and tube well remove the table all need provide adiabatic heat preservation according to the drawing requirement, and heat preservation thickness is confirmed according to heat, return water pipe diameter: the pipe diameter is 15mm and 20mm, and the thickness of the heat-insulating layer is 20 mm; the pipe diameter is 25mm to 50mm, and the thickness of the heat-insulating layer is 30 mm; the pipe diameter of the pipeline is between 65mm and 100mm, and the thickness of the heat-insulating layer is 40 mm; the pipe diameter is larger than 100mm, and the thickness of the heat-insulating layer is 50 mm; the water meter rear branch pipe (except for a buried wall pipeline) adopts electric tracing heat preservation, the heat preservation thickness is 10mm, and the water supply, reclaimed water and pressure drainage pipelines can be selected by referring to anti-condensation heat preservation calculation;
(2) and after the anti-condensation heat-preservation thickness is checked and calculated, the anti-condensation heat-preservation thickness of the water supply pipes, the intermediate water pipes and the cooling tower water supply pipes are selected from the water supply pipes, the intermediate water pipes and the cooling tower water supply pipes meeting the requirements in section 5.2.2 of the technical specification book of the electromechanical system-water supply and drainage system, except for the pipes buried in the wall or laid in the floor, the water supply pipes, the intermediate water pipes and the cooling tower water supply pipes in all the suspended ceilings and the pipe wells need to be provided with heat-preservation pipe sections 15mm away from the construction drawing to prevent the pipes from condensation, after the heat preservation and cold preservation are completed by adopting the economic thickness calculation, the anti-scalding and anti-condensation heat preservation calculation is adopted for verification, and the larger thickness is taken as the selection basis.
Preferably, the heat preservation thickness of the air conditioner blast pipe, the return air pipe, the fresh air pipe, the smoke exhaust air pipe and the kitchen oil exhaust air pipe meets the related thickness requirement in a chart-heat preservation requirement table (continuation) of the twenty-eighth chapter of the technical specification of electromechanical systems, namely the heat preservation thickness is 50mm, and the heat preservation thickness of the electric heat tracing system pipeline is related to, and the heat preservation thickness and the heating power of an electric heat tracing line are two variables, so the heat preservation thickness and the heating power of the electric heat tracing line are not calculated and selected.
Compared with the prior art, the invention has the beneficial effects that:
the invention improves the pipeline thickness calculation method in the prior art, redesigns a pipeline thickness calculator, and can be used for calculating the thickness of different pipeline systems such as an air-conditioning chilled water supply (return) water system, an air-conditioning heating supply (return) water system, a heating and domestic hot water primary side system, a multi-split refrigerant pipe system, a water supply and drainage system, an air-conditioning air supply pipe, a return air pipe, a fresh air pipe, a smoke exhaust air pipe, a kitchen oil smoke exhaust air pipe system and the like in a targeted manner, thereby greatly improving the accuracy of calculation data, effectively reducing the deviation of calculation results and enabling the obtained calculation results to be more scientific.
Drawings
FIG. 1 is a flow chart of a computing method of the present invention;
FIG. 2 is a table of x as a function of xlnx (xlnx when x is 1-5);
FIG. 3 is a table of the insulation thickness comparison (calculated amount);
FIG. 4 is a table showing calculation of insulation thickness of pipes of the air-conditioning and water-heating system;
FIG. 5 is a table showing a calculation of the insulation thickness of the primary side hot water system pipes;
FIG. 6 is a table showing the calculation of the insulation thickness of pipes in a domestic hot water system;
FIG. 7 is a table showing the calculation of the insulation thickness of the pipes of the water supply anti-condensation system;
FIG. 8 is a table of calculation of insulation thickness of pipes of the reclaimed water anti-condensation system;
FIG. 9 is a table of calculation of insulation thickness of pipes of the air conditioning water condensation prevention checking system;
FIG. 10 is a schematic view of a program interface for calculating the thickness of a water pipe according to the present invention;
FIG. 11 is a schematic view of a program interface for calculating the thickness of a plastic water pipe according to the present invention;
FIG. 12 is a schematic view of a program interface for calculating the thickness of a new plastic water pipe according to the present invention;
FIG. 13 is a schematic view of a program interface for calculating duct thickness according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1-9, the present invention provides a technical solution: a pipe thickness calculator comprising the pipe thickness calculations of the following systems:
the calculation process of the air conditioner chilled water supply (return) system comprises the following steps:
firstly, a formula is selected by calculation: (economic calculation)
Selecting parameters and selecting basis:
(1) energy price (Yuan/GJ), PESelecting 75 yuan/GJ according to GB50736-2012 appendix K, wherein the repayment is 6 years, the rewarding is 10%, the using days are 120 days, and the repayment is taken at 2880 hours, because the heat prices selected in the urban heat supply pipe network and the gas heat supply are different, the urban central heat supply gas is 85 yuan/KJ, the urban heat supply is 35 yuan/KJ, and the heat prices are different in heat preservation economic thickness selection;
(2) selecting the heat-insulating material according to lambda of heat supply of fuel gas, selecting the heat-insulating coefficient lambda of rubber and plastic at 40 ℃ to be less than or equal to 0.040W/(m.K) according to the requirement of chapter 28 of the second part of technical specification, and selecting the heat-insulating material according to actual selection;
(3) the annual running time t is taken according to 120 days and 2880 hours, can be selected according to the design requirements of design units, and can also be selected according to GB50736-2012 appendix K;
(4)T0the temperature of the outer surface of the pipeline is the lowest temperature T of the medium in long-term operation0The method comprises the following steps that (1) when the temperature of the outer surface of a heat-insulating layer is 7 ℃, the temperature of the outer surface of the heat-insulating layer is 60 ℃, the temperature of the outer surface of a cold-insulating layer is +0.3 ℃ at the position, the temperature of the outer surface of a pipeline in the operation process is also selected according to a design instruction and an actual form in the system operation process, the temperature is confirmed in a manual input mode, when a lining pipeline is adopted, the temperature of the outer surface of the pipeline needs to be selected through calculation, when a lining is not adopted, the temperature of a medium in normal operation is selected, and;
(5)Tataking T as the ambient temperatureaWhen the temperature of the outer surface of the pipeline is 80 ℃, the temperature of the environment is 20 ℃; when the surface temperature is 81-110 ℃, the environmental temperature is 30 ℃; when the temperature of the outer surface is greater than or equal to 110 ℃, the environmental temperature is 40 ℃; taking the soil temperature during direct burial;
(6) economic thickness heat preservation calculation alphasSelecting heat release coefficient alpha of the external surface area of the heat insulation layer according to a 08K507 atlassThe heat insulation layer structure is characterized in that 11.63W/(. square meter. K) is selected, the heat release coefficient of the outer surface of the heat insulation and cold insulation layer is selected indoors to be 11.63, 8.141 is selected during scald prevention calculation and dew prevention calculation, the unit cost of the heat insulation layer structure is selected according to 08K507 of an atlas or the cost after the actual price (including related loss and a protective layer) is selected, the heat insulation thickness is increased when the price is too low, and the heat insulation thickness is smaller when the price is too high;
(7)PTunit cost of heat insulation structure, selecting P according to 08K507T3700 yuan/m3；
(8) S, thermal insulation engineering annual amortization rate, selecting 6 years of repayment and 10% of profit according to the atlas, and calculating to obtain 23% of S;
thirdly, calculating the outer diameter of the pipeline
Selecting the outer diameter of the pipeline according to the GB/T-3091 welded steel pipe for low-pressure fluid transportation as follows:
DN 20-external diameter 26.9mm, DN 25-external diameter 33.7mm
DN 32-outer diameter 42.4mm, DN 40-outer diameter 48.3mm
DN 50-outer diameter 60.3mm, DN 65-outer diameter 76.1mm
DN 80-external diameter 88.9mm, DN 100-external diameter 114.3mm
DN 125-outer diameter 139.7mm, DN 150-outer diameter 168.3mm
DN 200-external diameter 219.1mm, DN 250-external diameter 273mm
DN 300-external diameter 325mm, DN 350-external diameter 377mm
DN 400-outer diameter 426 mm;
fourthly, calculating the thickness by adopting the economical heat preservation method as follows:
DN20 finding out delta 25.00mm
DN25 finding out delta being 26.07mm
DN32 finding out delta 27.28mm
DN40 finding out delta 27.94mm
DN50 finding out delta 29.00mm
DN65 finding out delta 30.17mm
DN80 finds out that delta is 30.63mm
DN100 found that delta is 31.35mm
DN125 solves the problem that delta is 32.69mm
DN150 found that delta is 32.82mm
DN200 found δ 34.18mm
DN250 finds out delta 35.49mm
DN300 found that delta is 36.97mm
DN350 obtaining delta 35.53 mm;
checking and calculating by adopting anti-condensation heat preservation, wherein the calculated heat preservation thickness is as follows:
DN20 finds out delta 22.38mm
DN25 finding out delta 23.44mm
DN32 finding out delta 24.39mm
DN40 finding out delta 24.80mm
DN50 finding out delta 25.67mm
DN65 finding out delta 26.71mm
DN80 finding out delta 27.16mm
DN100 found that delta is 28.23mm
DN125 finds out delta being 28.60mm
DN150 finds out that delta is 29.54mm
DN200 found that delta is 29.91mm
DN250 finds out delta 30.17mm
DN300 finds out that delta is 30.63mm
DN350 obtaining delta-30.63 mm;
in conclusion, the heat preservation thickness of the chilled water supply (return) pipe of the air conditioner is selected as follows:
DN20 choosing delta-30 mm
DN25 choosing delta-30 mm
DN32 choosing delta-30 mm
DN40 choosing delta-30 mm
DN50 choosing delta-30 mm
DN65 choosing delta-32 mm
DN80 choosing delta-32 mm
DN100 selects delta-32 mm
DN125 chooses delta-40 mm
DN150 selects delta-40 mm
DN200 selects delta-40 mm
DN250 selects delta-40 mm
DN300 selects delta-40 mm
DN350 selects delta as 40 mm;
the air-conditioning heating water supply (return) system comprises the following steps:
firstly, a formula is selected by calculation: (economic calculation)
Selecting parameters and selecting basis:
(1) energy price (Yuan/GJ), PEWhen the ratio is 85 yuan/GJ, chooseSelecting according to GB50736-2012 annex K, wherein the repayment is 6 years, the rewarding is 10%, the using days are 120 days, and the repayment is taken within 2880 hours, because the heat prices selected in the heat supply of the urban heat supply pipe network and the gas are different, the urban central heat supply gas is 85 yuan/KJ, the urban heat supply is 35 yuan/KJ, and the thickness selection types of different heat prices to the heat preservation economy are different;
(2) selecting the heat-insulating material according to lambda of heat supply of fuel gas, selecting the heat-insulating coefficient lambda of rubber and plastic at 40 ℃ to be less than or equal to 0.040W/(m.K) according to the requirement of chapter 28 of the second part of technical specification, and selecting the heat-insulating material according to actual selection;
(3) the annual running time t is taken according to 120 days and 2880 hours, can be selected according to the design requirements of design units, and can also be selected according to GB50736-2012 appendix K;
(4)T0the temperature of the outer surface of the pipeline is the lowest temperature T of the medium in long-term operation 060 ℃, selecting 60 ℃ for the temperature of the outer surface of the heat-insulating layer, selecting the dew point temperature of the place +0.3 ℃ for the temperature of the outer surface of the cold-insulating layer, selecting the temperature of the outer surface of the pipeline in the operation process according to the design specification and the actual form in the system operation process, and confirming the temperature by adopting a manual input form, wherein when the pipeline with lining is adopted, the temperature of the outer surface of the pipeline needs to be selected by calculation, when the lining is not adopted, the temperature of the medium in normal operation is selected, and when the lining is adopted, the temperature is selected by calculation;
(5)Tataking T as the ambient temperatureaWhen the temperature of the outer surface of the pipeline is 80 ℃, the environmental temperature is 20 ℃; when the surface temperature is 81-110 ℃, the environmental temperature is 30 ℃; when the temperature of the outer surface is greater than or equal to 110 ℃, the environmental temperature is 40 ℃; taking the soil temperature during direct burial;
(6) economic thickness heat preservation calculation alphasSelecting heat release coefficient alpha of the external surface area of the heat insulation layer according to a 08K507 atlass11.63W/square meter K, selecting 11.63 in the heat release coefficient chamber on the outer surface of the heat-insulating and cold-insulating layer, selecting 8.141 in the calculation of scald prevention and dewing prevention, and selecting the unit manufacturing cost of the heat-insulating layer structure according to the figureThe 08K507 is selected or the cost is selected according to the actual price (including related loss and a protective layer), the heat preservation thickness is increased when the price is too low, and the heat preservation thickness is smaller when the price is too high;
(7)PTunit cost of heat insulation structure, selecting P according to 08K507T3700 yuan/m3；
(8) S, thermal insulation engineering annual amortization rate, selecting 6 years of repayment and 10% of profit according to the atlas, and calculating to obtain 23% of S;
(9) k safety factor, which is selected to be in a value range of 1.2-1.4 according to the specification, is calculated according to the K value of 1.3, and regarding the K safety factor, the K safety factor is generally selected to be 1 in the economic calculation of heat preservation and cold preservation, and the K safety factor is selected to be 1.1-1.4 in the condensation prevention, and the K safety factor is determined according to the property of the material;
thirdly, calculating the outer diameter of the pipeline
Selecting the outer diameter of the pipeline according to the GB/T-3091 welded steel pipe for low-pressure fluid transportation as follows:
DN 20-external diameter 26.9mm, DN 25-external diameter 33.7mm
DN 32-outer diameter 42.4mm, DN 40-outer diameter 48.3mm
DN 50-outer diameter 60.3mm, DN 65-outer diameter 76.1mm
DN 80-external diameter 88.9mm, DN 100-external diameter 114.3mm
DN 125-outer diameter 139.7mm, DN 150-outer diameter 168.3mm
DN 200-external diameter 219.1mm, DN 250-external diameter 273 mm;
fourthly, calculating the thickness by adopting the economical heat preservation method as follows:
DN20 finding out delta 24.34mm
DN25 finding out delta 25.44mm
DN32 finding out delta 26.71mm
DN40 finding out delta 27.29mm
DN50 finding out delta 28.49mm
DN65 finding out delta 29.68mm
DN80 finding out delta 30.23mm
DN100 found that delta is 31.43mm
DN125 found delta 32.13mm
DN150 found that delta is 33.66mm
DN200 found that delta is 33.96mm
DN250 finds out delta 34.81mm
DN300 found that delta is 35.75m
DN350 obtaining delta 35.82 mm;
adopting the heat loss prevention check to calculate the heat preservation thickness as follows:
DN20 finding out delta 6.46mm
DN25 finds out that delta is 6.74mm
DN32 finding out delta 6.89mm
DN40 finding out delta 7.00mm
DN50 finding out delta 7.09mm
DN65 finding out delta 7.23mm
DN80 found that delta is 7.33mm
DN100 found that delta is 7.43mm
DN125 found that delta is 7.33mm
DN150 found that delta is 7.99mm
DN200 found that delta is 7.67mm
DN250 finds out delta 7.51mm
DN300 found that delta is 7.31mm
DN350 obtaining delta 7.54 mm;
sixthly, the heat preservation of the air-conditioning heating water supply (return) pipe is selected to have the following thickness:
DN20 choosing delta-30 mm
DN25 choosing delta-30 mm
DN32 choosing delta-30 mm
DN40 choosing delta-30 mm
DN50 choosing delta-30 mm
DN65 choosing delta-30 mm
DN80 choosing delta-32 mm
DN100 selects delta-32 mm
DN125 chooses delta-40 mm
DN150 selects delta-40 mm
DN200 selects delta-40 mm
DN250 selects delta-40 mm
DN300 selects delta-40 mm
DN350 is delta-40 mm.
For a heating and domestic hot water primary side system (the temperature of pipeline water is above 60), selecting the heat-insulating thickness and the medium thickness of a chart-heat-insulating requirement table (continuation) of the technical specification of an electromechanical system in the second eighteenth chapter of air conditioner, heating and ventilation system according to the economical thickness calculation and the pipeline heat loss calculation, namely DN50 and the following prefabricated rigid glass fiber heat-insulating pipe section with the thickness of 40 mm; DN 70-DN 300 are selected to have the heat preservation thickness of 50mm, and DN350 and above have the heat preservation thickness of 60 mm;
for the heat preservation of the pipelines of the multi-split refrigerant pipe system, the density of the rubber plastic closed-bubble heat-insulation material is 40-64 kg/m according to the technical specification requirements3The heat conductivity coefficient K is less than or equal to 0.040(W/(m DEG C)), and as for the safety coefficient K, 1 is generally selected in the economic calculation of heat preservation and cold preservation, the selection in the anti-condensation is 1.1-1.4, the specific selection is determined according to the material properties, the heat conductivity coefficient of the heat insulating layer is selected according to the corresponding numerical value in the design instruction or the drawing set, the manual input mode is adopted for determination, the calculation is carried out by adopting the single-layer heat preservation consideration, in the range of the heat preservation density and the heat conductivity coefficient of the refrigerant pipeline required by 07K506 < design and construction installation of multi-split air conditioner system >, according to the 11.6 provisions of the drawing set, when the outer diameter of the copper pipe is phi 6.35-phi 25.4, the thickness of the heat insulation is recommended to be 10 mm; when the outer diameter is phi 28.6-phi 41.3, the recommended heat insulation thickness is 15mm, and a multi-split system does not have related parameters or different refrigerant forms, so that the common heat insulation thickness calculation is based on the provision of equipment manufacturers;
the heat preservation thickness of the water supply and drainage pipeline comprises the following two aspects:
(1) and calculating the heat preservation thickness of the hot water supply and return pipelines:
through economic heat preservation calculation and heat loss heat preservation thickness check calculation, the heat preservation thickness of the hot water pipeline is selected to meet the requirements of section 5.2.2 of the technical specification book of electromechanical systems-water supply and drainage systems, and the thicknesses are selected as follows: branch pipe behind hot water pipeline, the return water pipeline of all furred ceilings and tube well remove the table all need provide adiabatic heat preservation according to the drawing requirement, and heat preservation thickness is confirmed according to heat, return water pipe diameter: the pipe diameter is 15mm and 20mm, and the thickness of the heat-insulating layer is 20 mm; the pipe diameter is 25mm to 50mm, and the thickness of the heat-insulating layer is 30 mm; the pipe diameter of the pipeline is between 65mm and 100mm, and the thickness of the heat-insulating layer is 40 mm; the pipe diameter is larger than 100mm, and the thickness of the heat-insulating layer is 50 mm; the water meter rear branch pipe (except for a buried wall pipeline) adopts electric tracing heat preservation, the heat preservation thickness is 10mm, and the water supply, reclaimed water and pressure drainage pipelines can be selected by referring to anti-condensation heat preservation calculation;
(2) after the anti-dewing heat preservation thickness check calculation, the anti-dewing heat preservation thickness of the water supply pipes, the middle water pipes and the cooling tower water supply pipe pipelines meets the requirements in section 5.2.2 of the technical specification book of electromechanical systems-water supply and drainage system, except for the pipelines buried in walls or laid in floors, the water supply pipes, the middle water pipes and the cooling tower water supply pipes in all suspended ceilings and pipe wells need to provide heat preservation pipe sections after 15mm according to the requirements of construction drawings so as to prevent the pipelines from dewing, after the heat preservation and cold preservation are completed by adopting the economic thickness calculation, the anti-scalding and anti-dewing heat preservation calculation is adopted for verification, and the larger thickness is taken as the selection basis;
the heat preservation thickness of an air conditioner blast pipe, a return air pipe, a fresh air pipe, a smoke exhaust air pipe and a kitchen oil exhaust air pipe meets the related thickness requirement in a chart-heat preservation requirement table (continuation) of the twenty-eight chapter of the technical specification of an electromechanical system, namely the heat preservation thickness is 50mm, and relates to the heat preservation thickness of an electric tracing system pipeline, and two variables of the heat preservation thickness and the heating power of an electric tracing line exist.
Example 2:
referring to figures 10-13 of the drawings,
when the thickness of the water pipe is calculated, firstly, calculating the flow speed and resistance or calculating the pipe diameter and resistance in one item of calculation content, then selecting input load or input flow in one item of calculation basis, respectively inputting water supply temperature and return water temperature in one item of load and flow conversion, respectively selecting pipe wall roughness and water temperature in one item of basic parameters, and finally, respectively selecting load units and flow units, namely, automatically calculating;
when the thickness of the plastic water pipe is calculated, firstly, input load or input flow is selected in one item of calculation basis, then, water temperature is selected in one item of basic parameters, then, water supply temperature and water return temperature are respectively input in one item of conversion of load and flow, and finally, load units and flow units are respectively selected, so that automatic calculation can be carried out;
when the thickness of the new plastic water pipe is calculated, firstly, selecting input load or input flow in one item of calculation basis, then selecting water temperature in one item of basic parameters, then respectively inputting water supply temperature and return water temperature in one item of conversion of load and flow, then clicking a diameter comparison table, respectively inputting corresponding nominal outer diameter and calculated inner diameter after selecting a regulation scheme, and finally respectively selecting load units and flow units, thus automatically calculating;
when the thickness of the air pipe is calculated, firstly, a round shape or a rectangular shape is selected in one item of the section of the air pipe, then, the pipe wall roughness is selected in one item of the basic parameters, the pipe wall roughness correction coefficient, the kinematic viscosity and the density are respectively input, then, one item is selected and corrected, the atmospheric pressure, the temperature and the relative humidity are respectively input in one item of the air state correction, and then, the air volume unit is selected, so that the automatic calculation can be carried out.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A pipe thickness calculator comprising the pipe thickness calculations of the following systems:
the calculation process of the air conditioner chilled water supply (return) system comprises the following steps:
firstly, a formula is selected by calculation: (economic calculation)
Selecting parameters and selecting basis:
(1) energy price (Yuan/GJ), PESelecting 75 yuan/GJ according to GB50736-2012 appendix K, wherein the repayment is 6 years, the rewarding is 10%, the using days are 120 days, and the repayment is taken at 2880 hours, because the heat prices selected in the urban heat supply pipe network and the gas heat supply are different, the urban central heat supply gas is 85 yuan/KJ, the urban heat supply is 35 yuan/KJ, and the heat prices are different in heat preservation economic thickness selection;
(2) selecting the heat-insulating material according to lambda of heat supply of fuel gas, selecting the heat-insulating coefficient lambda of rubber and plastic at 40 ℃ to be less than or equal to 0.040W/(m.K) according to the requirement of chapter 28 of the second part of technical specification, and selecting the heat-insulating material according to actual selection;
(3) the annual running time t is taken according to 120 days and 2880 hours, can be selected according to the design requirements of design units, and can also be selected according to GB50736-2012 appendix K;
(4)T0the temperature of the outer surface of the pipeline is the lowest temperature T of the medium in long-term operation0The method comprises the following steps that (1) when the temperature of the outer surface of a heat-insulating layer is 7 ℃, the temperature of the outer surface of the heat-insulating layer is 60 ℃, the temperature of the outer surface of a cold-insulating layer is +0.3 ℃ at the position, the temperature of the outer surface of a pipeline in the operation process is also selected according to a design instruction and an actual form in the system operation process, the temperature is confirmed in a manual input mode, when a lining pipeline is adopted, the temperature of the outer surface of the pipeline needs to be selected through calculation, when a lining is not adopted, the temperature of a medium in normal operation is selected, and when the lining is adopted, the temperature is selected through calculation;
(5)Tataking T as the ambient temperatureaWhen the temperature of the outer surface of the pipeline is 80 ℃, the temperature of the environment is 20 ℃; when the surface temperature is 81-110 ℃, the environmental temperature is 30 ℃; when the temperature of the outer surface is greater than or equal to 110 ℃, the environmental temperature is 40 ℃; taking the soil temperature during direct burial;
(6) economic thickness heat preservation calculation alphasSelecting heat release coefficient alpha of the external surface area of the heat insulation layer according to a 08K507 atlassThe heat insulation layer structure is characterized in that 11.63W/(. square meter. K) is selected, the heat release coefficient of the outer surface of the heat insulation and cold insulation layer is selected indoors to be 11.63, 8.141 is selected during scald prevention calculation and dew prevention calculation, the unit cost of the heat insulation layer structure is selected according to 08K507 of an atlas or the cost after the actual price (including related loss and a protective layer) is selected, the heat insulation thickness is increased when the price is too low, and the heat insulation thickness is smaller when the price is too high;
(7)PTunit cost of heat insulation structure, selecting P according to 08K507T3700 yuan/m3；
(8) S, thermal insulation engineering annual amortization rate, selecting 6 years of repayment and 10% of profit according to the atlas, and calculating to obtain 23% of S;
thirdly, calculating the outer diameter of the pipeline
Selecting the outer diameter of the pipeline according to the GB/T-3091 welded steel pipe for low-pressure fluid transportation as follows:
DN 20-external diameter 26.9mm, DN 25-external diameter 33.7mm
DN 32-outer diameter 42.4mm, DN 40-outer diameter 48.3mm
DN 50-outer diameter 60.3mm, DN 65-outer diameter 76.1mm
DN 80-external diameter 88.9mm, DN 100-external diameter 114.3mm
DN 125-outer diameter 139.7mm, DN 150-outer diameter 168.3mm
DN 200-external diameter 219.1mm, DN 250-external diameter 273mm
DN 300-external diameter 325mm, DN 350-external diameter 377mm
DN 400-outer diameter 426 mm;
fourthly, calculating the thickness by adopting the economical heat preservation method as follows:
DN20 finding out delta 25.00mm
DN25 finding out delta being 26.07mm
DN32 finding out delta 27.28mm
DN40 finding out delta 27.94mm
DN50 finding out delta 29.00mm
DN65 finding out delta 30.17mm
DN80 finds out that delta is 30.63mm
DN100 found that delta is 31.35mm
DN125 solves the problem that delta is 32.69mm
DN150 found that delta is 32.82mm
DN200 found δ 34.18mm
DN250 finds out delta 35.49mm
DN300 found that delta is 36.97mm
DN350 obtaining delta 35.53 mm;
checking and calculating by adopting anti-condensation heat preservation, wherein the calculated heat preservation thickness is as follows:
DN20 finds out delta 22.38mm
DN25 finding out delta 23.44mm
DN32 finding out delta 24.39mm
DN40 finding out delta 24.80mm
DN50 finding out delta 25.67mm
DN65 finding out delta 26.71mm
DN80 finding out delta 27.16mm
DN100 found that delta is 28.23mm
DN125 finds out delta being 28.60mm
DN150 finds out that delta is 29.54mm
DN200 found that delta is 29.91mm
DN250 finds out delta 30.17mm
DN300 finds out that delta is 30.63mm
DN350 obtaining delta-30.63 mm;
in conclusion, the heat preservation thickness of the chilled water supply (return) pipe of the air conditioner is selected as follows:
DN20 choosing delta-30 mm
DN25 choosing delta-30 mm
DN32 choosing delta-30 mm
DN40 choosing delta-30 mm
DN50 choosing delta-30 mm
DN65 choosing delta-32 mm
DN80 choosing delta-32 mm
DN100 selects delta-32 mm
DN125 chooses delta-40 mm
DN150 selects delta-40 mm
DN200 selects delta-40 mm
DN250 selects delta-40 mm
DN300 selects delta-40 mm
DN350 selects delta as 40 mm;
the air-conditioning heating water supply (return) system comprises the following steps:
firstly, a formula is selected by calculation: (economic calculation)
Selecting parameters and selecting basis:
(1) energy price (Yuan/GJ), PESelecting according to GB50736-2012 appendix K when the difference is 85 yuan/GJ, wherein the repayment is 6 years, the rewarding is 10%, the using day is 120 days, and the repayment is taken at 2880 hours, because the heat prices selected in the heat supply by adopting the urban heat supply pipe network and the gas are different, the urban central heat supply gas is 85 yuan/KJ, the urban heat supply is 35 yuan/KJ, and the heat price is different from the heat preservation economical thickness;
(2) selecting the heat-insulating material according to lambda of heat supply of fuel gas, selecting the heat-insulating coefficient lambda of rubber and plastic at 40 ℃ to be less than or equal to 0.040W/(m.K) according to the requirement of chapter 28 of the second part of technical specification, and selecting the heat-insulating material according to actual selection;
(3) the annual running time t is taken according to 120 days and 2880 hours, can be selected according to the design requirements of design units, and can also be selected according to GB50736-2012 appendix K;
(4)T0the temperature of the outer surface of the pipeline is the lowest temperature T of the medium in long-term operation060 ℃ for the outer surface temperature of the heat-insulating layer, and +0.3 ℃ for the outer surface temperature of the cold-insulating layer, wherein the outer surface temperature of the pipeline in the operation process also needs to be selected according to design instructions and actual forms in the system operation process, the outer surface temperature of the pipeline is confirmed in a manual input form, when the pipeline with the lining is adopted, the outer surface temperature of the pipeline needs to be selected through calculation, and when the lining is not adopted, the medium is selected for normal operationThe temperature of the lining should be selected by calculation when the lining exists;
(5)Tataking T as the ambient temperatureaWhen the temperature of the outer surface of the pipeline is 80 ℃, the environmental temperature is 20 ℃; when the surface temperature is 81-110 ℃, the environmental temperature is 30 ℃; when the temperature of the outer surface is greater than or equal to 110 ℃, the environmental temperature is 40 ℃; taking the soil temperature during direct burial;
(6) economic thickness heat preservation calculation alphasSelecting heat release coefficient alpha of the external surface area of the heat insulation layer according to a 08K507 atlassThe heat insulation layer structure is characterized in that 11.63W/(. square meter. K) is selected, the heat release coefficient of the outer surface of the heat insulation and cold insulation layer is selected indoors to be 11.63, 8.141 is selected during scald prevention calculation and dew prevention calculation, the unit cost of the heat insulation layer structure is selected according to 08K507 of an atlas or the cost after the actual price (including related loss and a protective layer) is selected, the heat insulation thickness is increased when the price is too low, and the heat insulation thickness is smaller when the price is too high;
(7)PTunit cost of heat insulation structure, selecting P according to 08K507T3700 yuan/m3；
(8) S, thermal insulation engineering annual amortization rate, selecting 6 years of repayment and 10% of profit according to the atlas, and calculating to obtain 23% of S;
(9) k safety factor, which is selected to be in a value range of 1.2-1.4 according to the specification, is calculated according to the K value of 1.3, and regarding the K safety factor, the K safety factor is generally selected to be 1 in the economic calculation of heat preservation and cold preservation, and the K safety factor is selected to be 1.1-1.4 in the condensation prevention, and the K safety factor is determined according to the property of the material;
thirdly, calculating the outer diameter of the pipeline
Selecting the outer diameter of the pipeline according to the GB/T-3091 welded steel pipe for low-pressure fluid transportation as follows:
DN 20-external diameter 26.9mm, DN 25-external diameter 33.7mm
DN 32-outer diameter 42.4mm, DN 40-outer diameter 48.3mm
DN 50-outer diameter 60.3mm, DN 65-outer diameter 76.1mm
DN 80-external diameter 88.9mm, DN 100-external diameter 114.3mm
DN 125-outer diameter 139.7mm, DN 150-outer diameter 168.3mm
DN 200-external diameter 219.1mm, DN 250-external diameter 273 mm;
fourthly, calculating the thickness by adopting the economical heat preservation method as follows:
DN20 finding out delta 24.34mm
DN25 finding out delta 25.44mm
DN32 finding out delta 26.71mm
DN40 finding out delta 27.29mm
DN50 finding out delta 28.49mm
DN65 finding out delta 29.68mm
DN80 finding out delta 30.23mm
DN100 found that delta is 31.43mm
DN125 found delta 32.13mm
DN150 found that delta is 33.66mm
DN200 found that delta is 33.96mm
DN250 finds out delta 34.81mm
DN300 found that delta is 35.75m
DN350 obtaining delta 35.82 mm;
adopting the heat loss prevention check to calculate the heat preservation thickness as follows:
DN20 finding out delta 6.46mm
DN25 finds out that delta is 6.74mm
DN32 finding out delta 6.89mm
DN40 finding out delta 7.00mm
DN50 finding out delta 7.09mm
DN65 finding out delta 7.23mm
DN80 found that delta is 7.33mm
DN100 found that delta is 7.43mm
DN125 found that delta is 7.33mm
DN150 found that delta is 7.99mm
DN200 found that delta is 7.67mm
DN250 finds out delta 7.51mm
DN300 found that delta is 7.31mm
DN350 obtaining delta 7.54 mm;
sixthly, the heat preservation of the air-conditioning heating water supply (return) pipe is selected to have the following thickness:
DN20 choosing delta-30 mm
DN25 choosing delta-30 mm
DN32 choosing delta-30 mm
DN40 choosing delta-30 mm
DN50 choosing delta-30 mm
DN65 choosing delta-30 mm
DN80 choosing delta-32 mm
DN100 selects delta-32 mm
DN125 chooses delta-40 mm
DN150 selects delta-40 mm
DN200 selects delta-40 mm
DN250 selects delta-40 mm
DN300 selects delta-40 mm
DN350 is delta-40 mm.
2. The pipe thickness calculator of claim 1, wherein: for a heating and domestic hot water primary side system (the temperature of pipeline water is above 60), selecting the heat-insulating thickness and the medium thickness of a chart-heat-insulating requirement table (continuation) of the technical specification of an electromechanical system in the second eighteenth chapter of air conditioner, heating and ventilation system according to the economical thickness calculation and the pipeline heat loss calculation, namely DN50 and the following prefabricated rigid glass fiber heat-insulating pipe section with the thickness of 40 mm; DN 70-DN 300 are selected from the thermal insulation thickness of 50mm, DN350 and above thermal insulation thickness of 60 mm.
3. The pipe thickness calculator of claim 1, wherein: for the heat preservation of the pipelines of the multi-split refrigerant pipe system, the density of the rubber plastic closed-bubble heat-insulation material is 40-64 kg/m according to the technical specification requirements3The heat conductivity coefficient K is less than or equal to 0.040(W/(m DEG C), the safety coefficient K is generally selected to be 1 in the economical calculation of heat preservation and cold insulation, is selected to be 1.1-1.4 in the condensation prevention, is determined according to the material property, the heat conductivity coefficient of the heat insulation layer is selected according to the corresponding numerical value in the design description or the drawing set and is determined by adopting a manual input mode, the calculation adopts the single-layer heat preservation consideration for calculation, and is within the range of the heat preservation density and the heat conductivity coefficient of a refrigerant pipeline required by 07K506 'design and construction of a multi-split air conditioner system',therefore, according to the specification of the 11.6 th item of the drawing set, when the outer diameter of the copper pipe is phi 6.35-phi 25.4, the thickness of the heat insulation is recommended to be 10 mm; when the outer diameter is phi 28.6-phi 41.3, the recommended heat insulation thickness is 15mm, and the general heat insulation thickness calculation is based on the provision of equipment manufacturers because no related parameters and different refrigerant forms exist in a multi-split system.
4. The pipe thickness calculator of claim 1, wherein: the heat preservation thickness of the water supply and drainage pipeline comprises the following two aspects:
(1) and calculating the heat preservation thickness of the hot water supply and return pipelines:
through economic heat preservation calculation and heat loss heat preservation thickness check calculation, the heat preservation thickness of the hot water pipeline is selected to meet the requirements of section 5.2.2 of the technical specification book of electromechanical systems-water supply and drainage systems, and the thicknesses are selected as follows: branch pipe behind hot water pipeline, the return water pipeline of all furred ceilings and tube well remove the table all need provide adiabatic heat preservation according to the drawing requirement, and heat preservation thickness is confirmed according to heat, return water pipe diameter: the pipe diameter is 15mm and 20mm, and the thickness of the heat-insulating layer is 20 mm; the pipe diameter is 25mm to 50mm, and the thickness of the heat-insulating layer is 30 mm; the pipe diameter of the pipeline is between 65mm and 100mm, and the thickness of the heat-insulating layer is 40 mm; the pipe diameter is larger than 100mm, and the thickness of the heat-insulating layer is 50 mm; the water meter rear branch pipe (except for a buried wall pipeline) adopts electric tracing heat preservation, the heat preservation thickness is 10mm, and the water supply, reclaimed water and pressure drainage pipelines can be selected by referring to anti-condensation heat preservation calculation;
(2) and after the anti-condensation heat-preservation thickness is checked and calculated, the anti-condensation heat-preservation thickness of the water supply pipes, the intermediate water pipes and the cooling tower water supply pipes are selected from the water supply pipes, the intermediate water pipes and the cooling tower water supply pipes meeting the requirements in section 5.2.2 of the technical specification book of the electromechanical system-water supply and drainage system, except for the pipes buried in the wall or laid in the floor, the water supply pipes, the intermediate water pipes and the cooling tower water supply pipes in all the suspended ceilings and the pipe wells need to be provided with heat-preservation pipe sections 15mm away from the construction drawing to prevent the pipes from condensation, after the heat preservation and cold preservation are completed by adopting the economic thickness calculation, the anti-scalding and anti-condensation heat preservation calculation is adopted for verification, and the larger thickness is taken as the selection basis.
5. The pipe thickness calculator of claim 1, wherein: the heat preservation thickness of an air conditioner blast pipe, a return air pipe, a fresh air pipe, a smoke exhaust air pipe and a kitchen oil exhaust air pipe meets the related thickness requirement in a chart-heat preservation requirement table (continuation) of the twenty-eight chapter of the technical specification of an electromechanical system, namely the heat preservation thickness is 50mm, and the heat preservation thickness of an electric tracing system pipeline is related to the heat preservation thickness, and the heat preservation thickness and the heating power of an electric tracing line are two variables, so the heat preservation thickness and the heating power of the electric tracing line are not calculated and selected.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160202055A1 (en) * | 2013-09-09 | 2016-07-14 | Rockwool International A/S | System for determining insulation thickness |
| CN111931337A (en) * | 2020-07-03 | 2020-11-13 | 中建三局第三建设工程有限责任公司 | Type selection construction method for electric tracing band of chemical pipeline |
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2021
- 2021-05-20 CN CN202110552383.3A patent/CN113282870A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160202055A1 (en) * | 2013-09-09 | 2016-07-14 | Rockwool International A/S | System for determining insulation thickness |
| CN111931337A (en) * | 2020-07-03 | 2020-11-13 | 中建三局第三建设工程有限责任公司 | Type selection construction method for electric tracing band of chemical pipeline |
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| Title |
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| 中国标准出版社出版发行: "GB/T3091-2015", Retrieved from the Internet <URL:http://www.gb168.cn> * |
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