CN102735708A - Determination system and method for heat exchange coefficient of cooper pipe - Google Patents
Determination system and method for heat exchange coefficient of cooper pipe Download PDFInfo
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- CN102735708A CN102735708A CN2012102174155A CN201210217415A CN102735708A CN 102735708 A CN102735708 A CN 102735708A CN 2012102174155 A CN2012102174155 A CN 2012102174155A CN 201210217415 A CN201210217415 A CN 201210217415A CN 102735708 A CN102735708 A CN 102735708A
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Abstract
The present invention discloses a determination system for a heat exchange coefficient of a cooper pipe. The system comprises a cooper pipe inlet, a cooper pipe outlet, and a sleeve type test mechanism. The sleeve type test mechanism comprises an inner bush and an outer bush, wherein the inner bush is installed inside the outer bush, and a closed outer bush cavity is formed between the outer bush and the side wall of the inner bush, and is provided with an outer bush inlet and an outer bush outlet. The interior of the inner bush is provided for installing a cooper pipe requiring detection. A closed inner bush cavity is formed between the side wall of the cooper pipe requiring detection and the inner bush, and is provided with an inner bush inlet and an inner bush outlet. The outer bush inlet and the outer bush outlet of the outer bush cavity are connected with a steam generator to form a circulation circuit. The inner bush inlet is connected with the steam generator. The system and the method of the present invention have the following advantages that: it is ensured that the steam temperature is 100 DEG C when the steam enters double layers of the bushes from the steam generator; the outer bush can provide complete heat insulation for the inner bush; and the operation is simple, and the implementation is easy.
Description
Technical field
The present invention relates to a kind of metal tube coefficient of heat conductivity and measure the field, especially be applicable to the mensuration system and method for a kind of copper pipe coefficient of heat transfer of the metal tube that coefficient of heat conductivity such as copper is strong.
Background technology
At present, the employed air-condition heat exchanger of China mainly contains the inner screw thread copper pipe that adopts different tube diameters.Inner screw thread copper pipe producer processes the inner screw thread copper pipe of different size according to the requirement of air-conditioning factory, and for the inner screw thread copper pipe of different size, its good effect of heat exchange is bad only to be judged by rule of thumb.To this problem, be necessary the copper pipe coefficient of heat transfer of different size is tested, producer can transformation and optimization internal thread equipment like this, so that produce heat exchange copper tube efficiently, satisfies the demand of air-conditioning factory to inner screw thread copper pipe.
Summary of the invention
Technical matters to be solved by this invention is the deficiency that exists to prior art, and the simply mensuration system of a kind of copper pipe coefficient of heat transfer of the fast detecting metal coefficient of heat transfer is provided.
Another object of the present invention provides a kind of assay method of the copper pipe coefficient of heat transfer.
The present invention realizes through following technical scheme: a kind of mensuration system of the copper pipe coefficient of heat transfer; Comprise copper pipe import, copper pipe outlet and bushing type test mechanism; Said copper pipe import and copper pipe outlet are installed on the both sides of said bushing type test mechanism respectively; Said bushing type test mechanism comprises inner sleeve and outer sleeve; Said inner sleeve is installed in the said outer sleeve, forms the overcoat cavity of sealing between said outer sleeve and the inner sleeve sidewall, and said overcoat cavity is provided with outer sleeve import and outer sleeve outlet; Be used to install copper pipe to be detected in the said inner sleeve, and form the interior cover cavity of sealing between said copper pipe sidewall to be detected and the inner sleeve, said interior cover cavity is provided with inner sleeve import and inner sleeve outlet; The outer sleeve import of said overcoat cavity and outer sleeve outlet are connected to form closed circuit with steam generator, and said inner sleeve import is connected with said steam generator.
Said inner sleeve outlet is connected with condensate collector.
Said copper pipe inflow point is provided with inflow point's thermometer and flowmeter, and said copper pipe exit is provided with the exit thermometer.
Said outer tube lateral wall is enclosed with heat-insulation layer.
Said copper pipe inflow point is provided with water intaking valve.
Between said copper pipe import and the copper pipe outlet differential manometer is installed.
Said steam generator is provided with steam side thermometer and pressure limiting valve.
Pipeline all is enclosed with insulation material in the said bushing type test mechanism.
A kind of assay method of the copper pipe coefficient of heat transfer uses the mensuration system of the above-mentioned copper pipe coefficient of heat transfer, and its step comprises:
(1) prepares copper pipe to be detected by the length dimension requirement of the mensuration system inner sleeve type test mechanism of the copper pipe coefficient of heat transfer, and copper pipe to be detected is installed between the copper pipe import and copper pipe outlet of inner sleeve of bushing type test mechanism;
(2) open water intaking valve, open steam generator, open the steam side valve;
(3) control steam side temperature is 100 degree, records discharge, inflow point's temperature, exit temperature after waiting for a period of time;
(4) steam off generator, steam side valve, water intaking valve successively;
(5) according to following thermal equilibrium formula, utilize discharge, inlet temperature, outlet temperature, the copper pipe size to be detected measured, calculate the coefficient of heat transfer of copper pipe:
The thermal equilibrium formula is:
Mean temperature difference (MTD) Δ t
m:
In the formula, t
oBe the outlet temperature of water in the pipe, t
InBe the inlet temperature of water in the pipe, t
sIt is the temperature of saturated steam;
Heat transfer coefficient:
Q＝m×γ
s （3）
In the formula, m, γ
sBe respectively the condensate quality of sleeve pipe collection and the latent heat of condensation of water, A is a copper pipe external surface area to be detected, can be to come out through copper pipe external diameter to be detected and length computation.
Wherein,
In the formula, h
iBe the copper pipe average surface coefficient of heat transfer (being the coefficient of heat transfer of copper pipe of the present invention), h
oFor managing the outer average condensation surface coefficient of heat transfer, λ is the temperature conductivity of copper pipe, d
oBe copper pipe overall diameter to be detected, d
InBe copper pipe interior diameter to be detected.
Manage the rule of thumb formula employing of outer condensation heat transfer coefficient:
R, ρ
s, λ
s, μ
sBe respectively the latent heat of vaporization of steam under state of saturation, density, thermal conductivity and viscosity, t
wBe copper pipe hull-skin temperature to be detected.。
Repeating step (1) is to more than (4) three times and calculate the coefficient of heat transfer measured value of copper pipe average heat transfer coefficient as copper pipe.
Compared with prior art, the invention has the beneficial effects as follows: the vapor (steam) temperature when guaranteeing from steam generator entering double layer sleeve barrel all is 100 ℃; Because adopted the structure of double braid covering cartridge type, outer layer sleeve can be accomplished the complete thermal insulation to inner layer sleeve; Easy and simple to handle, and implement than being easier to.
Description of drawings
Fig. 1 is the principle schematic of the mensuration system of a kind of copper pipe coefficient of heat transfer of the present invention.
Fig. 2 is the structural representation of bushing type test mechanism of the mensuration system of a kind of copper pipe coefficient of heat transfer of the present invention.
Among the figure, 1 is that water intaking valve, 2 exports, 21 is that inner sleeve exports for outer sleeve for heat-insulation layer, 20 for outer sleeve, 19 for outer sleeve import, 18 for inner sleeve, 17 for copper pipe, 16 for copper pipe outlet, 15 for copper pipe import, 13 for steam side valve, 12 for steam side thermometer, 11 for steam generator, 10 for pressure limiting valve, 9 for condensate collector, 8 for bushing type test mechanism, 7 for exit thermometer, 6 for differential manometer, 5 for inflow point's thermometer, 4 for flowmeter, 3.
Embodiment
Below in conjunction with figure and embodiment the present invention is done further detailed description.
A kind of mensuration system of the copper pipe coefficient of heat transfer, as depicted in figs. 1 and 2, it comprises copper pipe import 12, copper pipe outlet 13 and bushing type test mechanism 6, said copper pipe import 12 and copper pipe outlet 13 are installed on the both sides of said bushing type test mechanism 6 respectively.Said bushing type test mechanism 6 comprises inner sleeve 16 and outer sleeve 18; Said inner sleeve 16 is installed in the said outer sleeve 18; Form the overcoat cavity of sealing between said outer sleeve 18 and inner sleeve 16 sidewalls, said overcoat cavity is provided with outer sleeve import 17 and outer sleeve outlet 20; Be used for installation test copper pipe 15 in the said inner sleeve 26, and form the interior cover cavity of sealing between the inwall of the sidewall of said test copper pipe 15 and inner sleeve 26, said interior cover cavity is provided with inner sleeve import 14 and inner sleeve outlet 21.Outlet 21 is connected to form closed circuit with steam generator 9 with outer sleeve in the outer sleeve import 17 of said overcoat cavity, is used to make inner sleeve 16 to form stationary temperature.Said inner sleeve import 14 is connected with said steam generator 9, is used to be input into water vapor.Be provided with inflow point's thermometer 3 and flowmeter 2 at said copper pipe import 12 places, said copper pipe exports 13 places and is provided with exit thermometer 5.Is connected with condensate collector 7 in said inner sleeve outlet 21, collection is from the condensate of interior cover cavity outflow.Said outer tube 18 lateral walls are enclosed with heat-insulation layer 19, further ensure the heat-insulating property of outer tube 18.Be provided with water intaking valve 1 in said copper pipe inflow point 12.Between said copper pipe import 12 and the copper pipe outlet 13 differential manometer 4 is installed, is used to detect the pressure differential between two mouthfuls.Said steam generator 9 is provided with steam side thermometer 10 and pressure limiting valve 8, with assurance safety, and is provided with steam side valve 11 between said steam generator 9 and inner sleeve import 14 and the outer sleeve import 17.
Principle of work of the present invention is: the steam that steam generator 9 produces gets into said bushing type test mechanism 6 respectively, and the steam that steam generator 9 produces gets into inside and outside sleeve from the inner sleeve import 14 of inner sleeve 16 and the import 17 of outer sleeve 18 respectively.Inner chamber steam heats experimental piece copper pipe outer wall, and the steam of overcoat cavity plays the adiabatic effect of inner chamber.Outer sleeve is a simple cycle, and steam gets into the back from outer sleeve import 17 and flows back to steam generator 9 from exporting 20.Steam condenses into water in inner layer sleeve, export 21 condensations from inner sleeve and flow out, and the water collector 7 that is condensed collects.Cold water flows into from the copper pipe import 12 of test copper pipe 15, flows out from the copper pipe outlet 13 of test copper pipe then.
A kind of assay method of the copper pipe coefficient of heat transfer, on the basis of the mensuration system of the above-mentioned copper pipe coefficient of heat transfer, its step comprises:
(1) prepares the sample to be tested copper pipe by said bushing type test mechanism 6 dimensional requirements, and the sample copper pipe is installed between the copper pipe import 12 and copper pipes outlet 1 in the inner sleeve 16 of said bushing type test mechanism 6.
(2) open water intaking valve 1, open steam generator 9, open steam side valve 10.
(3) control steam side thermometer maintains 100 degree, waits for after a while, records discharge, inflow point's temperature, exit temperature behind the temperature stabilization.
(4) steam off generator 9, steam side valve 10, water intaking valve 1 successively.
(5) according to following thermal equilibrium formula, utilize discharge, inlet temperature, outlet temperature, the copper pipe dimensional parameters measured, calculate the coefficient of heat transfer of copper pipe.
The thermal equilibrium formula is:
Mean temperature difference (MTD):
In the formula, t
oIt is the outlet temperature of water in the pipe; t
InBe the inlet temperature of water in the pipe, t
sIt is the temperature of saturated steam.
3) heat transfer coefficient:
Q＝m×γ
s （4）
(4) in the formula, m, γ
sBe respectively the condensate quality of sleeve pipe collection and the latent heat of condensation of water.
Wherein,
In the formula, h
iBe the copper pipe average surface coefficient of heat transfer (being the coefficient of heat transfer of copper pipe of the present invention), h
oFor managing the outer average condensation surface coefficient of heat transfer, λ is the temperature conductivity of copper pipe.
Manage the rule of thumb formula employing of outer condensation heat transfer coefficient:
R, ρ
s, λ
s, μ
sBe respectively the steam latent heat of vaporization under state of saturation, density, thermal conductivity and viscosity.
Repeating step (1) is to more than (5) three times and calculate the coefficient of heat transfer measured value of copper pipe average heat transfer coefficient as copper pipe.
A kind of assay method of the copper pipe coefficient of heat transfer uses the mensuration system of the above-mentioned copper pipe coefficient of heat transfer, and its step comprises:
(1) prepares copper pipe to be detected by length, internal diameter and the outside dimension requirement of the mensuration system inner sleeve type test mechanism 6 of the copper pipe coefficient of heat transfer, and copper pipe to be detected is installed between the copper pipe import 12 and copper pipe outlet 13 of inner sleeve of bushing type test mechanism;
(2) open water intaking valve 1, open steam generator 9, open steam side valve 10;
(3) control steam side temperature is 100 degree, waits for a period of time, and records discharge, inflow point's temperature, exit temperature etc. behind the temperature stabilization;
(4) steam off generator 9, steam side valve 10, water intaking valve 1 successively;
(5) according to following thermal equilibrium formula, utilize discharge, inlet temperature, outlet temperature, the copper pipe size to be detected measured, calculate the coefficient of heat transfer of copper pipe:
The thermal equilibrium formula is:
Mean temperature difference (MTD) Δ t
m:
In the formula, t
oBe the outlet temperature of water in the pipe, t
InBe the inlet temperature of water in the pipe, t
sIt is the temperature of saturated steam;
Heat transfer coefficient:
Q＝m×γ
s （3）
In the formula, m, γ
sBe respectively the condensate quality of sleeve pipe collection and the latent heat of condensation of water, A is a copper pipe external surface area to be detected.
Wherein,
In the formula, h
iBe the copper pipe average surface coefficient of heat transfer (being the coefficient of heat transfer of copper pipe of the present invention), h
oFor managing the outer average condensation surface coefficient of heat transfer, λ is the temperature conductivity of copper pipe, d
oBe copper pipe overall diameter to be detected, d
InBe copper pipe interior diameter to be detected.
Manage the rule of thumb formula employing of outer condensation heat transfer coefficient:
Wherein, r, ρ
s, λ
s, μ
sBe respectively the latent heat of vaporization of steam under state of saturation, density, thermal conductivity and viscosity, t
wBe copper pipe hull-skin temperature to be detected.
Repeating step (1) is to more than (4) three times and calculate the coefficient of heat transfer measured value of copper pipe average heat transfer coefficient as copper pipe.
Claims (8)
1. the mensuration system of a copper pipe coefficient of heat transfer; It is characterized in that: comprise copper pipe import, copper pipe outlet and bushing type test mechanism; Said copper pipe import and copper pipe outlet are installed on the both sides of said bushing type test mechanism respectively, and said bushing type test mechanism comprises inner sleeve and outer sleeve, and said inner sleeve is installed in the said outer sleeve; Form the overcoat cavity of sealing between said outer sleeve and the inner sleeve sidewall, said overcoat cavity is provided with outer sleeve import and outer sleeve outlet; Be used to install copper pipe to be detected in the said inner sleeve, and form the interior cover cavity of sealing between said copper pipe sidewall to be detected and the inner sleeve, said interior cover cavity is provided with inner sleeve import and inner sleeve outlet; The outer sleeve import of said overcoat cavity and outer sleeve outlet are connected to form closed circuit with steam generator, and said inner sleeve import is connected with said steam generator.
2. according to the mensuration system of the described a kind of copper pipe coefficient of heat transfer of claim 1, it is characterized in that: said inner sleeve outlet is connected with condensate collector.
3. according to the mensuration system of the described a kind of copper pipe coefficient of heat transfer of claim 2, it is characterized in that: said copper pipe inflow point is provided with inflow point's thermometer and flowmeter, and said copper pipe exit is provided with the exit thermometer.
4. according to the mensuration system of the described a kind of copper pipe coefficient of heat transfer of claim 2, it is characterized in that: said outer tube lateral wall is enclosed with heat-insulation layer.
5. according to the mensuration system of the described a kind of copper pipe coefficient of heat transfer of claim 1, it is characterized in that: said copper pipe inflow point is provided with water intaking valve.
6. according to the mensuration system of the described a kind of copper pipe coefficient of heat transfer of claim 1, it is characterized in that: between said copper pipe import and the copper pipe outlet differential manometer is installed.
7. according to the mensuration system of the described a kind of copper pipe coefficient of heat transfer of claim 1, it is characterized in that: said steam generator is provided with steam side thermometer and pressure limiting valve.
8. the assay method of a copper pipe coefficient of heat transfer is characterized in that: use the mensuration system like the arbitrary described copper pipe coefficient of heat transfer of claim 1-7, its step comprises:
(1) prepares copper pipe to be detected by the length dimension requirement of the mensuration system inner sleeve type test mechanism of the copper pipe coefficient of heat transfer, and copper pipe to be detected is installed between the copper pipe import and copper pipe outlet of inner sleeve of bushing type test mechanism;
(2) open water intaking valve, open steam generator, open the steam side valve;
(3) control steam side temperature is 100 ℃, records discharge, inflow point's temperature, exit temperature behind the temperature stabilization;
(4) steam off generator, steam side valve, water intaking valve successively;
(5), calculate the coefficient of heat transfer of copper pipe according to following thermal equilibrium formula:
The thermal equilibrium formula is:
Mean temperature difference (MTD) Δ t
m:
In the formula, t
oBe the outlet temperature of water in the pipe, t
InBe the inlet temperature of water in the pipe, t
sIt is the temperature of saturated steam;
Heat transfer coefficient:
Q＝m×γ
s （3）
In the formula, m, γ
sBe respectively the condensate quality of sleeve pipe collection and the latent heat of condensation of water, A is a copper pipe external surface area to be detected;
Wherein,
In the formula, h
iBe the copper pipe average surface coefficient of heat transfer; h
oFor managing the outer average condensation surface coefficient of heat transfer, λ is the temperature conductivity of copper pipe, d
oBe copper pipe overall diameter to be detected, d
InBe copper pipe interior diameter to be detected;
Manage the rule of thumb formula employing of outer condensation heat transfer coefficient:
Wherein, r, ρ
s, λ
s, μ
sBe respectively the steam latent heat of vaporization under state of saturation, density, thermal conductivity and viscosity.
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| CN201210217415.5A CN102735708B (en) | 2012-06-27 | 2012-06-27 | Determination system and method for heat exchange coefficient of cooper pipe |
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| CN201210217415.5A CN102735708B (en) | 2012-06-27 | 2012-06-27 | Determination system and method for heat exchange coefficient of cooper pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792256A (en) * | 2014-01-25 | 2014-05-14 | 内蒙古科技大学 | Experimental device for measuring periodical heat transfer coefficient |
| CN103995017A (en) * | 2014-04-04 | 2014-08-20 | 内蒙古科技大学 | Experiment method for determining periodic heat transfer coefficient |
| CN104749203A (en) * | 2013-12-30 | 2015-07-01 | 印度石油有限公司 | Method and system for testing and evaluating heat transfer elements at high temperature operations |
| CN105738412A (en) * | 2016-04-29 | 2016-07-06 | 华南理工大学 | Fluoroplastic single-tube fume heat exchange coefficient testing device |
| CN105806888A (en) * | 2016-04-29 | 2016-07-27 | 华南理工大学 | System for measuring heat transfer coefficient of flue gas of fluoroplastic single tube |
| CN111103320B (en) * | 2019-12-13 | 2023-04-07 | 浙江海亮股份有限公司 | Heat exchange coefficient measuring device |
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2012
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| JPH07146263A (en) * | 1993-11-24 | 1995-06-06 | Kurita Water Ind Ltd | Estimation method for fouling coefficient of heat exchanger |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749203A (en) * | 2013-12-30 | 2015-07-01 | 印度石油有限公司 | Method and system for testing and evaluating heat transfer elements at high temperature operations |
| CN104749203B (en) * | 2013-12-30 | 2018-02-13 | 印度石油有限公司 | For testing and assessing the method and system of the heat transfer element under high-temperature operation |
| CN103792256A (en) * | 2014-01-25 | 2014-05-14 | 内蒙古科技大学 | Experimental device for measuring periodical heat transfer coefficient |
| CN103995017A (en) * | 2014-04-04 | 2014-08-20 | 内蒙古科技大学 | Experiment method for determining periodic heat transfer coefficient |
| CN103995017B (en) * | 2014-04-04 | 2016-08-17 | 内蒙古科技大学 | A kind of experimental technique measuring cyclical heat transmission coefficient |
| CN105738412A (en) * | 2016-04-29 | 2016-07-06 | 华南理工大学 | Fluoroplastic single-tube fume heat exchange coefficient testing device |
| CN105806888A (en) * | 2016-04-29 | 2016-07-27 | 华南理工大学 | System for measuring heat transfer coefficient of flue gas of fluoroplastic single tube |
| CN111103320B (en) * | 2019-12-13 | 2023-04-07 | 浙江海亮股份有限公司 | Heat exchange coefficient measuring device |
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| CN102735708B (en) | 2014-08-20 |
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