CN105067661A - Gas-liquid heat exchanger heat transfer coefficient determination apparatus - Google Patents
Gas-liquid heat exchanger heat transfer coefficient determination apparatus Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及换热器传热系数测试装置，尤其是涉及一种气-液换热器传热系数测定装置。The invention relates to a test device for the heat transfer coefficient of a heat exchanger, in particular to a device for measuring the heat transfer coefficient of a gas-liquid heat exchanger.
背景技术Background technique
换热器因为换热对象的不同、使用场合的不同、传热介质的不同，导致换热器的种类繁多，从介质物理状态不同来分，主要由气-气换热、气-液换热、液-液换热，中间还有一些涉及相变的换热，对于不同性质、不同相介质之间的换热器，其结构形式是不同的，如液态相的导热系数很高，但是气态相的导热系数很低，这样热阻主要集中在气态侧，为了提高传热系数，增加传热效率，气态侧需要采用翅片扩展表面积、提高气体流速、强制湍流扰动等降低气态侧热阻，以提高传热效率；然后增加气流扰动会引起压降增加，所以需要合理取舍多个参数之间的取值范围。因此，对于这样的结构就需要专门的传热系数测试评价装置，以获得高效传热所需的数据，而不能用一般的传热系数测试装置进行测定，因此对于不同换热器，会有不同的传热系数测试装置，以获得需要的性能参数。Due to different heat exchange objects, different use occasions, and different heat transfer media, there are many types of heat exchangers. From the different physical states of the media, they are mainly divided into gas-gas heat exchange and gas-liquid heat exchange. , Liquid-liquid heat exchange, there are some heat exchanges involving phase change in the middle, for heat exchangers with different properties and different phase media, their structural forms are different, such as the thermal conductivity of the liquid phase is very high, but the gaseous phase The thermal conductivity of the phase is very low, so the thermal resistance is mainly concentrated on the gaseous side. In order to improve the heat transfer coefficient and increase the heat transfer efficiency, the gaseous side needs to use fins to expand the surface area, increase the gas flow rate, and force turbulent disturbances to reduce the thermal resistance of the gaseous side. In order to improve the heat transfer efficiency; then increasing the air flow disturbance will cause the pressure drop to increase, so it is necessary to choose a reasonable range of values between multiple parameters. Therefore, for such a structure, a special heat transfer coefficient test and evaluation device is required to obtain the data required for efficient heat transfer, and it cannot be measured with a general heat transfer coefficient test device, so for different heat exchangers, there will be different The heat transfer coefficient test device to obtain the required performance parameters.
国内外对换热器传热系数测试的研究较多，如北京钢铁学院的张克强提出的申请号为86102931“传热系数测定仪”，利用计算机控制，连续测量连铸二冷水和铸坯表面间的传热系数和热流密度，通过传热系数的测定，可设计和改进二冷喷嘴的结构，提高铸坯质量和产量。如哈尔滨工程大学范广铭等提出的申请号为201010587371.6“多功能宽流程单相对流换热试验装置”，公开了一种多功能宽流程的单相流换热实验装置，包括循环水系统、电加热系统、测量系统、实验段四部分组成。循环水系统由热水循环系统和冷水循环系统两部分组成；电加热系统主要由电加热器和相应的控制系统构成；测量系统包括温度测量、流量测量、压差测量及相应的数据采集系统；实验段由一套管式换热器和一管束换热器并联组成；集传热管和管束换热器单相对流换热和流动阻力测试于一体，可以在层流区、过渡区和紊流区的很宽的雷诺数范围内对不同形状、不同几何尺寸的传热管和不同布管方式的换热器进行传热特性及流动阻力特性的试验研究。东北电力学院的杨善让等提出的申请号为200510088762.2“管侧对流换热强化技术动态模拟综合评价方法及装置”，公开了一种用于动态模拟综合评价管侧对流换热强化技术的换热效果、流动阻力、污垢特性和清洗特性的方法和监测、评价装置。该装置主要由管式模拟换热器、循环水冷却装置、补水箱、集水槽、水泵、恒温调节器、耐垢性强的流量测量装置、胶球清洗模拟装置以及计算机监测评价系统等部分组成；该监测、评价方法以强化换热管和普通光管的换热过程的基本影响因素相同为基础，采用除实验目标参数外其余参数(管径、长度、工质、Re数)全部相同的强化管和光管平行置于同一温度恒定的水浴槽中，以进行强化换热和光管换热的类比分析；本发明中还包括评价实验工况选择、实验条件、实验程序、强化技术设计优化等内容。北京航空航天大学的徐国强等提出的申请号为200410074334.X“一种对流换热系数的测试方法及其对流换热系数传感器”，该发明公开了一种能够直接测量对流换热表面对流换热系数的传感器，该发明是基于传热学的基本理论而设计的对流换热系数传感器，它可以直接得到被测物体表面的对流换热系数数据，也可以用于测量对流换热表面的对流换热热流，可广泛用于工业生产中。正如前面指出的，换热器传热系数测定装置与换热器结构具有很强的针对性，申请号为86102931只适用于铸坯传热系数的测定；申请号为201010587371.6适用于光管传热系数测定，由于是通过水作为介质进行测量，不适用于气体介质的测量；申请号为200510088762.2同样只适用于液相介质传热系数的测定；申请号为200410074334.X虽然没有限定传热介质，但是对于带翅片扩展的气-液换热器的传热系数测定也不适用，因为它不能测量到气相压降这一重要指标，压降对功耗、满足后续工艺需求十分重要。因此目前虽然有多重传热系数测试、评价装置，但是没有一种传热系数测定、评价装置能够用于对气-液换热器进行综合测试、评价的装置。There are many researches on the heat transfer coefficient test of heat exchangers at home and abroad. For example, Zhang Keqiang of Beijing Iron and Steel Institute put forward the application number 86102931 "Heat Transfer Coefficient Tester". The heat transfer coefficient and heat flux density, through the determination of the heat transfer coefficient, can design and improve the structure of the secondary cooling nozzle, and improve the quality and output of the slab. For example, the application number 201010587371.6 "Multi-functional wide-flow single-phase flow heat transfer test device" proposed by Fan Guangming of Harbin Engineering University discloses a multi-functional wide-flow single-phase flow heat transfer test device, including circulating water system, electric heating It consists of four parts: system, measurement system and experiment section. The circulating water system is composed of hot water circulation system and cold water circulation system; the electric heating system is mainly composed of electric heater and corresponding control system; the measurement system includes temperature measurement, flow measurement, pressure difference measurement and corresponding data acquisition system; The experimental section is composed of a set of tube heat exchangers and a tube bundle heat exchanger connected in parallel; it integrates single convective heat transfer and flow resistance testing of heat transfer tubes and tube bundle heat exchangers, and can be used in laminar flow regions, transition regions and turbulent regions. In a wide range of Reynolds numbers in the flow area, the heat transfer characteristics and flow resistance characteristics of heat transfer tubes with different shapes and geometric sizes and heat exchangers with different tube layout methods were studied. The application number 200510088762.2 "Dynamic Simulation and Comprehensive Evaluation Method and Device for Tube Side Convective Heat Transfer Enhancement Technology" proposed by Yang Shanrang from Northeast Electric Power College discloses a method for dynamic simulation and comprehensive evaluation of the heat transfer effect of tube side convective heat transfer enhancement technology , flow resistance, dirt characteristics and cleaning characteristics of the method and monitoring, evaluation device. The device is mainly composed of a tube-type simulated heat exchanger, a circulating water cooling device, a water supply tank, a sump, a water pump, a constant temperature regulator, a flow measuring device with strong scale resistance, a rubber ball cleaning simulation device, and a computer monitoring and evaluation system. The monitoring and evaluation method is based on the fact that the basic influencing factors of the heat exchange process of the enhanced heat exchange tube and the common light tube are the same, and all the other parameters (pipe diameter, length, working fluid, Re number) are all the same except the experimental target parameters. The intensified tube and the light tube are placed in parallel in the same water bath with a constant temperature, so as to carry out the analogy analysis of the enhanced heat transfer and the light tube heat transfer; the present invention also includes the evaluation of the selection of experimental conditions, experimental conditions, experimental procedures, and optimization of the design of the intensified technology. content. Xu Guoqiang from Beijing University of Aeronautics and Astronautics filed an application number 200410074334.X "A Test Method for Convective Heat Transfer Coefficient and Its Convective Heat Transfer Coefficient Sensor", which discloses a convective heat transfer surface that can directly measure convective heat transfer This invention is a convective heat transfer coefficient sensor designed based on the basic theory of heat transfer. It can directly obtain the convective heat transfer coefficient data on the surface of the measured object, and can also be used to measure the convective heat transfer coefficient of the convective heat transfer surface. Heat flow can be widely used in industrial production. As pointed out above, the heat transfer coefficient measuring device of the heat exchanger and the structure of the heat exchanger are highly targeted. The application number 86102931 is only applicable to the measurement of the heat transfer coefficient of the slab; the application number 201010587371.6 is applicable to the heat transfer of the light tube. Coefficient measurement, because it is measured by water as the medium, is not suitable for the measurement of gaseous medium; the application number is 200510088762.2 is also only applicable to the determination of the heat transfer coefficient of the liquid medium; although the application number is 200410074334.X does not limit the heat transfer medium, However, it is also not applicable to the measurement of the heat transfer coefficient of the gas-liquid heat exchanger with fin extension, because it cannot measure the important index of gas phase pressure drop, which is very important for power consumption and meeting the requirements of subsequent processes. Therefore, although there are multiple heat transfer coefficient test and evaluation devices at present, there is no device for heat transfer coefficient measurement and evaluation that can be used for comprehensive testing and evaluation of gas-liquid heat exchangers.
发明内容Contents of the invention
本发明的目的在于提供一种气-液换热器传热系数测定装置，可用于对不同气相侧翅片扩展形式和管子排列方式进行传热系数测试、压降测试和优化结构传热效率评价的装置。The purpose of the present invention is to provide a gas-liquid heat exchanger heat transfer coefficient measurement device, which can be used for heat transfer coefficient test, pressure drop test and optimized structure heat transfer efficiency evaluation for different gas phase side fin expansion forms and tube arrangement installation.
本发明采用的技术方案如下：The technical scheme that the present invention adopts is as follows:
本发明的风机的出风口安装有调节阀门，调节阀门的出口的管道内装有气体流量计，带90°弯头管道的一端与气体流量计的出口端连接，另一端与第一异径通的小端连接；气体加热器的进口端与第一异径通的大端连接，气体加热器的出口端与气-液换热器的进口端相连，气-液换热器的出口端与第二异径通的大端连接，第二异径通的小端通过带二个90°弯头管道与三通的第一端连接，三通的第二端与风机的进风口相连，三通的第三端放空口装有放空口调节阀门，以上构成气相的流体流道；气-液换热器的液体进口端与第三异径通小端相连，大端与气-液换热器相连，第三异径通的小端装有液体流量计和液体进口侧温度传感器；在气-液换热器的液体出口端与第四异径通大端相连，第四异径通的小端孔内装有液体出口侧温度传感器，大端与气-液换热器相连，以上构成液相的流体流道；气体加热器的出口端管内装有气体进口侧压力传感器和多个气体进口侧温度传感器，第二异径通的大端管内装有气体出口侧压力传感器和多个气体出口侧温度传感器。The air outlet of the blower fan of the present invention is equipped with a regulating valve, and a gas flowmeter is installed in the pipeline of the outlet of the regulating valve. One end of the pipeline with a 90° elbow is connected to the outlet end of the gas flowmeter, and the other end is connected to the first different-diameter connection. The small end is connected; the inlet end of the gas heater is connected to the large end of the first reducer, the outlet end of the gas heater is connected to the inlet end of the gas-liquid heat exchanger, and the outlet end of the gas-liquid heat exchanger is connected to the first The large end of the two different diameters is connected, the small end of the second different diameter is connected to the first end of the tee through a pipe with two 90° elbows, the second end of the tee is connected to the air inlet of the fan, and the tee The vent port at the third end is equipped with a vent port regulating valve, which constitutes a gas phase fluid flow channel; the liquid inlet port of the gas-liquid heat exchanger is connected to the small end of the third different diameter channel, and the large end is connected to the gas-liquid heat exchanger The small end of the third different-diameter channel is equipped with a liquid flow meter and a temperature sensor on the liquid inlet side; the liquid outlet end of the gas-liquid heat exchanger is connected to the large end of the fourth different-diameter channel, and the small end of the fourth different-diameter channel The end hole is equipped with a temperature sensor on the liquid outlet side, and the large end is connected to the gas-liquid heat exchanger, which constitutes a fluid flow channel for the liquid phase; the gas heater outlet tube is equipped with a gas inlet side pressure sensor and multiple gas inlet side. As for the temperature sensor, a gas outlet side pressure sensor and a plurality of gas outlet side temperature sensors are installed in the large end pipe of the second reducing channel.
所述气体进口侧温度传感器在同一圆周截面上均布；所述气体出口侧温度传感器在在同一圆周截面上均布。The gas inlet side temperature sensors are evenly distributed on the same circumferential section; the gas outlet side temperature sensors are evenly distributed on the same circumferential section.
所述气体加热器，是电加热或带有自动温度控制系统的蒸汽加热器。The gas heater is an electric heater or a steam heater with an automatic temperature control system.
所述气-液换热器由一系列换热管排列和安装于管子外侧的各种翅片构成。The gas-liquid heat exchanger is composed of a series of heat exchange tubes arranged and various fins installed outside the tubes.
所述气-液换热器由一系列管子排列的方式呈正方形、正三角形、转正三角形或矩形排列。The gas-liquid heat exchanger is arranged by a series of tubes in a square, regular triangle, regular triangle or rectangular arrangement.
所述翅片是平面的翅片、波浪形的翅片、带孔的翅片或是带突翼的翅片。The fins are planar fins, corrugated fins, fins with holes or fins with protruding wings.
本发明具有的有益效果是：The beneficial effects that the present invention has are:
气-液换热器是一种热阻主要集中于气体一侧的换热结构，因此需要对气体一侧进行强化传热，包括扩展翅片、增加气体扰流、增加气体流速。但是增加气流扰动会引起压降增加；增加气体流速会增加功耗，如何合理取舍多个参数之间的取值范围是设计这类结构的关键。本发明可以通过对传热系数的测定和压降、流体阻力等参数的测定和评价，优化各参数之间的取值，达到所需要的换热效果。The gas-liquid heat exchanger is a heat exchange structure whose thermal resistance is mainly concentrated on the gas side, so it is necessary to enhance heat transfer on the gas side, including expanding fins, increasing gas turbulence, and increasing gas flow rate. However, increasing the airflow disturbance will increase the pressure drop; increasing the gas flow rate will increase the power consumption. How to reasonably choose the value range between multiple parameters is the key to the design of this type of structure. The present invention can optimize the value of each parameter through the measurement of the heat transfer coefficient and the measurement and evaluation of parameters such as pressure drop and fluid resistance, so as to achieve the required heat exchange effect.
本测试评价装置采用气体侧流体循环利用，少量补充气体通过放空口调节阀门进行调节，大大节约了实验过程的能量损失。The test and evaluation device adopts gas side fluid recycling, and a small amount of supplementary gas is regulated through the regulating valve of the vent port, which greatly saves the energy loss in the experimental process.
附图说明Description of drawings
图1是本发明的结构示意图。Fig. 1 is a schematic structural view of the present invention.
图2是气-液换热器的换热元件布置图。Fig. 2 is a layout diagram of the heat exchange elements of the gas-liquid heat exchanger.
图3是气-液换热器的换热元件的侧视图。Fig. 3 is a side view of a heat exchange element of a gas-liquid heat exchanger.
图中：1、风机，2、调节阀门，3、气体流量计，4、带90°弯头管道，5、第一异径通，6、气体加热器，7、气体进口侧压力传感器，8、气体进口侧温度传感器，9、气-液换热器，10、第三异径通，11、液体进口端，12、液体流量计，13、液体进口侧温度传感器，14、气体出口侧温度传感器，15、气体出口侧压力传感器，16、带二个90°弯头管道，17、液体出口侧温度传感器，18、液体出口端，19、放空口，20、放空口调节阀门，21、三通，22、进风口，23、翅片，24、换热管子，25、第二异径通，26、第四异径通。In the figure: 1. Fan, 2. Regulating valve, 3. Gas flow meter, 4. Pipe with 90° elbow, 5. First reducer, 6. Gas heater, 7. Pressure sensor on the gas inlet side, 8 , Gas inlet side temperature sensor, 9, Gas-liquid heat exchanger, 10, Third different diameter channel, 11, Liquid inlet port, 12, Liquid flow meter, 13, Liquid inlet side temperature sensor, 14, Gas outlet side temperature Sensor, 15, gas outlet side pressure sensor, 16, pipe with two 90° elbows, 17, liquid outlet side temperature sensor, 18, liquid outlet port, 19, vent port, 20, vent port regulating valve, 21, three Pass, 22, air inlet, 23, fin, 24, heat exchange pipe, 25, the second different diameter pass, 26, the 4th different diameter pass.
具体实施方式Detailed ways
下面结合附图和实施例对本发明作进一步的说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
如图1、图2、图3所示，本发明的风机1的出风口安装有调节阀门2，调节阀门2的出口的管道内装有流量计3，带90°弯头管道4的一端与流量计3的出口端连接，另一端与第一异径通5的小端连接；气体加热器6的进口端与第一异径通5的大端连接，气体加热器6的出口端与气-液换热器9的进口端相连，气-液换热器的出口端与第二异径通25的大端连接，第二异径通25的小端通过带二个90°弯头管道16与三通21的第一端连接，三通21的第二端与风机1的进风口22相连，三通21的第三端放空口19装有放空口调节阀门20，以上构成气相的流体流道；气-液换热器的液体进口端11与第三异径通10小端相连，大端与气-液换热器相连，第三异径通10的小端装有液体流量计12和液体进口侧温度传感器13；在气-液换热器的液体出口端18与第四异径通26大端相连，第四异径通26的小端孔内装有液体出口侧温度传感器17，大端与气-液换热器6相连，以上构成液相的流体流道；气体加热器6的出口端管内装有气体进口侧压力传感器7和多个气体进口侧温度传感器8，第二异径通25的大端管内装有气体出口侧压力传感器15和多个气体出口侧温度传感器14。气相的流体走翅片一侧，液相的流体走管子内。As shown in Fig. 1, Fig. 2, Fig. 3, the air outlet of blower fan 1 of the present invention is equipped with regulating valve 2, and flow meter 3 is housed in the pipeline of the outlet of regulating valve 2, and one end of band 90 ° elbow pipe 4 is connected with flow rate The outlet end of the meter 3 is connected, and the other end is connected with the small end of the first different-diameter channel 5; the inlet end of the gas heater 6 is connected with the large end of the first different-diameter channel 5, and the outlet end of the gas heater 6 is connected with the gas- The inlet end of the liquid heat exchanger 9 is connected, the outlet end of the gas-liquid heat exchanger is connected to the large end of the second different diameter channel 25, and the small end of the second different diameter channel 25 passes through the pipe 16 with two 90° elbows. It is connected with the first end of the tee 21, the second end of the tee 21 is connected with the air inlet 22 of the fan 1, and the third end of the tee 21 is provided with a vent opening 19 with a vent regulating valve 20, which constitutes the fluid flow of the gas phase. Road; the liquid inlet port 11 of the gas-liquid heat exchanger is connected to the small end of the third different-diameter channel 10, the large end is connected to the gas-liquid heat exchanger, and the small end of the third different-diameter channel 10 is equipped with a liquid flowmeter 12 and the liquid inlet side temperature sensor 13; the liquid outlet end 18 of the gas-liquid heat exchanger is connected with the fourth different diameter passage 26 large end, and the liquid outlet side temperature sensor 17 is housed in the small end hole of the fourth different diameter passage 26, The big end is connected with the gas-liquid heat exchanger 6, and the above constitutes the fluid flow path of the liquid phase; the gas inlet side pressure sensor 7 and a plurality of gas inlet side temperature sensors 8 are installed in the outlet end tube of the gas heater 6, and the second different A gas outlet side pressure sensor 15 and a plurality of gas outlet side temperature sensors 14 are housed in the big end pipe of the diameter passage 25 . The fluid in the gas phase goes to one side of the fin, and the fluid in the liquid phase goes in the tube.
所述气体进口侧温度传感器8在同一圆周截面上均布；所述气体出口侧温度传感器14在在同一圆周截面上均布。The gas inlet side temperature sensors 8 are evenly distributed on the same circumferential section; the gas outlet side temperature sensors 14 are evenly distributed on the same circumferential section.
所述气体加热器6，是电加热或带有自动温度控制系统的蒸汽加热器。The gas heater 6 is an electric heater or a steam heater with an automatic temperature control system.
如图2所示，所述气-液换热器9由一系列换热管24排列和安装于管子外侧的翅片23构成。As shown in FIG. 2 , the gas-liquid heat exchanger 9 is composed of a series of heat exchange tubes 24 arranged and fins 23 installed outside the tubes.
如图3所示，所述气-液换热器9由一系列管子排列的方式呈正方形、正三角形、转正三角形或矩形排列，管子排列可以是单一的正方形、正三角形、转正三角形或矩形排列，或者是任意的二种和多种形状的排列。As shown in Figure 3, the gas-liquid heat exchanger 9 is arranged by a series of tubes in a square, regular triangle, regular triangle or rectangular arrangement, and the tube arrangement can be a single square, regular triangle, regular triangle or rectangular arrangement , or any arrangement of two or more shapes.
所述翅片23是平面的翅片、波浪形的翅片、带孔的翅片或是带突翼的翅片，翅片可以是单一的排列，或者是任意的二种和多种形状的排列。The fins 23 are planar fins, wavy fins, fins with holes or fins with protruding wings, and the fins can be in a single arrangement, or in any two or more shapes arrangement.
本发明的实施例：Embodiments of the invention:
本实施例采用5KW的高压离心风机，针对空分设备压缩机水冷系统换热器的传热系数进行测试和优化设计，气体流道的管子直径为159mm，液体流道的管子直径为31mm，换热器尺寸为300×250×400mm，加热器为功率15KW的电加热器，带有温度自动控制器，气-液换热器的液体相为水，气体相为空气，水流的管子为19mm，翅片为平直铜质翅片，管子排列为转正三角形排列，翅片间距为2.5mm，翅片厚度为0.2mm。空气流速从0-20m/s之间可调，水的流速在0-10m/s之间可调，可以模拟真实空分设备冷却器的工作环境。换热器气体进出口处各设有2个温度传感器，计算时候取其平均值作为计算值，换热器进出口处各设有压力传感器，用以测量压力降；流体进出口各设有一个温度传感器和流量计。In this embodiment, a 5KW high-pressure centrifugal fan is used to test and optimize the design of the heat transfer coefficient of the heat exchanger of the compressor water cooling system of the air separation plant. The pipe diameter of the gas flow path is 159mm, and the pipe diameter of the liquid flow path is 31mm. The size of the heater is 300×250×400mm. The heater is an electric heater with a power of 15KW and an automatic temperature controller. The liquid phase of the gas-liquid heat exchanger is water, the gas phase is air, and the pipe of the water flow is 19mm. The fins are straight copper fins, the tubes are arranged in a regular triangle arrangement, the fin spacing is 2.5mm, and the fin thickness is 0.2mm. The air flow rate is adjustable from 0-20m/s, and the water flow rate is adjustable from 0-10m/s, which can simulate the working environment of the real air separation plant cooler. There are two temperature sensors at the gas inlet and outlet of the heat exchanger, and the average value is used as the calculation value during calculation. Pressure sensors are installed at the inlet and outlet of the heat exchanger to measure the pressure drop; there is one at the fluid inlet and outlet. temperature sensor and flow meter.
其中一个测试例子如下：One of the test examples is as follows:
空气侧：空气流量q＝600m3/h，进口温度th1＝82℃，出口温度th2＝44.5℃。空气的平均温度为63℃，以此为定性温度，查表得空气密度ρ＝1.051kg/m3，空气的比热Cp＝1.006kJ/(kg·K)，水侧进口温度tc1＝25℃，出口温度tc2＝33℃Air side: air flow q=600m 3 /h, inlet temperature t h1 =82°C, outlet temperature t h2 =44.5°C. The average temperature of the air is 63°C, which is used as a qualitative temperature. The air density ρ = 1.051kg/m3, the specific heat of the air C p = 1.006kJ/(kg·K), and the inlet temperature of the water side t c1 = 25 °C, outlet temperature t c2 =33 °C
通过对气-液换热器的换热管子排列、安装于管子外侧的各种扩展翅片构成，如管子的排列可以呈正方形、正三角形，也可以是其他排列方式，翅片可以是平面的翅片，也可以是波浪形的翅片，还可以是带孔、带突翼的翅片，并通过与不同流量、风压的变化组合，通过对换热器进出口温度、流量的测定，可以按照以上实施例相同的方法方便地测得传热系数，并根据实际工程需求，对换热器综合性能进行评价，以得到理想的换热器结构与运行参数。It is formed by arranging the heat exchange tubes of the gas-liquid heat exchanger and installing various extended fins on the outside of the tubes. For example, the arrangement of the tubes can be square, regular triangle, or other arrangements, and the fins can be flat. The fins can also be wavy fins, or fins with holes and protruding wings, and through the combination of different flow and wind pressure changes, through the measurement of the temperature and flow of the inlet and outlet of the heat exchanger, The heat transfer coefficient can be conveniently measured according to the same method as in the above embodiments, and the comprehensive performance of the heat exchanger can be evaluated according to actual engineering requirements, so as to obtain the ideal structure and operating parameters of the heat exchanger.
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| CN110822948A (en) * | 2019-11-25 | 2020-02-21 | 榆林学院 | Small fan inner component tube type heat exchanger |
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