CN107192571B - Horizontal tube bundle and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change heat exchange test device - Google Patents

Horizontal tube bundle and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change heat exchange test device Download PDF

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Publication number
CN107192571B
CN107192571B CN201710453004.9A CN201710453004A CN107192571B CN 107192571 B CN107192571 B CN 107192571B CN 201710453004 A CN201710453004 A CN 201710453004A CN 107192571 B CN107192571 B CN 107192571B
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condenser
heat
pipeline
tube
test device
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CN107192571A (en
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冀文涛
李增耀
陶文铨
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Xian Jiaotong University
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Xian Jiaotong University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/002—Thermal testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00—Arrangements for charging or discharging refrigerant

Abstract

A kind of horizontal tube bundle and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change exchange heat test device, the test device can carry out different tube banks (row) and falling film evaporation, film condensation and the test of full-liquid type boiling heat transfer outside single tube, can also carry out the unidirectional forced convertion flow resistance coefficient test in heat-transfer pipe water side.Its feature is that test device includes refrigeration working medium, heating three circulatory systems of water and cooling water.Test device can test any pipe row spacing (2mm or more), and any pipe arranges arrangement, the falling film evaporation and film condensation heat transfer of tube bank (row) outside.The phase-change heat transfer coefficient of any one heat-transfer pipe in being restrained simultaneously.Measurement condition evaporation saturation temperature can can change in -10-20 DEG C, condensation saturation temperature in 30-50 DEG C, test pressure within the scope of 0-2.5MPa.Falling liquid film distributor can be replaced according to demand.The present invention integrates Horizontal single-pipe, the outer phase-change heat-exchange of tube bank and the side pressure fall-off test of single tube water, can meet different Research Requirements.

Description

Horizontal tube bundle and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change are changed Heat test device
Technical field
The present invention relates to field of Refrigeration and Air-conditioning, and in particular to a kind of horizontal tube bundle and the outer refrigeration working medium falling film evaporation of single tube, Pool boiling and condensation phase change heat exchange test device.
Background technique
Downward film evaporator, flooded evaporator and condenser are widely used in refrigerating and air conditioning industry, are large-scale refrigeration Crucial heat exchanger components inside air-conditioner set.The heat exchange of evaporator and condenser affects the operational efficiency of entire refrigeration unit, Therefore it develops high performance evaporator and condenser is the effective way for improving refrigerated air-conditioning system comprehensive performance.
Multiple rows of tube bank is disposed in horizontal shell-and-tube evaporator and condenser, pipe number of rows mesh has because of system heat load demand Difference.The heat exchange property for developing efficient heat exchanger tube and research novel refrigerant is all needed to the heat exchange outside heat transfer single tube and tube bank Characteristic carries out integration test.Because being located at the heat-exchange performance of different location pipe row in falling film evaporation, full-liquid type evaporation and condenser It can be variant.The heat exchange property of tube bank and single tube must be tested respectively.
Summary of the invention
The purpose of the present invention is to provide a kind of collection Horizontal single-pipe, the outer phase-change heat-exchange of tube bank and the side pressure fall-off tests of single tube water to be One can meet the horizontal tube bundle and the outer refrigeration working medium falling liquid film of single tube of the different Research Requirements of refrigeration air-conditioner manufacturer, scientific research institutions Evaporation, pool boiling and condensation phase change heat exchange test device.
In order to achieve the above objectives, the technical solution adopted by the present invention is that: including refrigerant circulation, heating water and cooling water follow Loop system；
The refrigerant-cycle systems include the condenser with pressure sensor and the evaporation with pressure sensor Device is stored with liquid phase refrigerant condenser top is disposed with cooling tube bundle, bottom is disposed with heat-transfer pipe in condenser, condense Device bottom refrigerant exit is connected by being equipped with the pipeline of cold medium flux meter and No.1 valve with the liquid film distributor in evaporator, Test tube bank is mounted on the lower end of liquid film distributor in evaporator, and evaporator top and bottom refrigerant exit also pass through respective pipe Road and No. two valves being mounted on respective pipeline, No. three valves are connected with condenser；
The heating water circulating system includes boiler, and boiler exports the electromagnetism by the road and being installed on the pipeline Flowmeter and temperature sensor are connected with the testing tube beam entrance in evaporator, temperature of the test tube bank outlet by the road and on pipeline Degree sensor is connected with the entrance of boiler；
The boiler also pass through pipeline and the valve being installed on the pipeline be connected with condenser thermal transfer pipe constitute circuit；
The cooling water recirculation system includes cooling water tank, and the outlet of cooling water tank by the road and is installed on the pipeline Temperature sensor and valve are connected with the entrance of cooling tube bundle and heat-transfer pipe in condenser, the outlet of cooling tube bundle and heat-transfer pipe By the road and the temperature sensor, valve and the cooling water flow meter that are installed on the pipeline are connected with cooling water tank.
The installation site of the evaporator is higher than condenser.
Electric heater, the boiler and cooling are separately installed in the condenser, boiler and cooling water tank Boiler air cooling chiller group and boiler air cooling chiller group are also connected on water tank.
Exhaust valve is also equipped on the evaporator.
Heating pump and cooling water pump are separately installed on the boiler and cooling water tank export pipeline.
Filling refrigerant inlet and refrigerant recovering valve are additionally provided on the condenser.
It is also equipped with refrigerant pump on the refrigerant exit pipeline of the condenser, is also connected on refrigerant pump entrance pipe The bypass with No. four valves being connected with condenser.
The cooling water selects cooling medium for water or glycol water；Evaporate saturation temperature be -10-20 DEG C, it is cold Solidifying saturation temperature is 30-50 DEG C, test pressure is 0-2.5MPa.
The present invention can carry out the outer falling film evaporation of horizontal tube bundle under different operating conditions, full-liquid type evaporation and condensation phase change heat transfer process The test of heat transfer property；It can carry out single tube outer different operating condition (- 10-20 DEG C of evaporation saturation temperature and condensation saturation temperature 30-50 DEG C, test pressure 0-2.5MPa) descending film evaporation, full-liquid type evaporation and the heat exchange test condensed；It can also carry out single tube water side pressure Drop and resistance coefficient test.Test data can accurately fit falling liquid film single tube, the heat transfer correlations outside tube bank.It can basis Different operating conditions adjust thermic load, and replace falling liquid film distributor according to demand.
Detailed description of the invention
Fig. 1 is the outer falling film evaporation of horizontal tube bundle of the present invention and condensation heat transfer test macro circulation figure；
Fig. 2 is the outer full-liquid type evaporation and heat-exchange experimental system circulation figure of Horizontal single-pipe of the present invention；
The outer full-liquid type evaporation heat transfer coefficient of Fig. 3 experimental system testing level light pipe and Cooper formula contrast；
Membranaceous condensation heat transfer coefficient and the comparison of Nusselt Theory Solution outside Fig. 4 experimental system testing level light pipe；
Fig. 5 experimental system tests water sidelight tube resistance coefficient and Filonenko formula contrast；
The exclusive Heat Transfer in Evaporating Falling Film coefficient of Fig. 6 experimental system testing tube.
In figure: (1) condenser；(2) evaporator；(3) electromagnetic flowmeter；(4) pressure sensor；(5) cold medium flux meter； (6) exhaust valve；(7) refrigerant pump；(8) refrigerant inlet is filled；(9) heating pump；(10) boiler；(11) refrigerant recovering valve； (12) cooling water pump；(13) cooling water tank；(14) liquid film distributor；(15) cooling water flow meter；(16) condenser heater.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1,2, the present invention includes refrigerant circulation, heating water and cooling water recirculation system；
Refrigerant-cycle systems include having the condenser 1 of pressure sensor and condenser heater 16 and passing with pressure The installation site of the evaporator 2 of sensor 4 and exhaust valve 6, evaporator 2 is higher than condenser 1, is disposed with cooling on 1 top of condenser Tube bank, bottom are disposed with heat-transfer pipe, and liquid phase refrigerant is stored in condenser 1, and filling refrigerant is additionally provided on condenser 1 and is entered Mouthfuls 8 and refrigerant recovering valve 11,1 bottom refrigerant exit of condenser by be equipped with the pipeline of cold medium flux meter 5 and No.1 valve with The liquid film distributor 14 of 2 inner top of evaporator is connected, and test tube bank is mounted on the lower end of liquid film distributor 14 in evaporator 2, steams No. two valves, No. three valves that 2 top of hair device and bottom refrigerant exit also pass through respective pipeline and be mounted on respective pipeline Door is connected with condenser 1；It is also equipped with refrigerant pump 7 on the refrigerant exit pipeline of condenser 1, on 7 entrance pipe of refrigerant pump also It is connected with the bypass with No. four valves being connected with condenser 1；
The heating water circulating system includes the boiler 10 with electric heater, the outlet of boiler 10 by the road and Heating pump 9, electromagnetic flowmeter 3 and the temperature sensor being installed on the pipeline are connected with the testing tube beam entrance in evaporator 2, Temperature sensor of the test tube bank outlet by the road and on pipeline is connected with the entrance of boiler 10；
The boiler 10, which is also connected by pipeline and the valve being installed on the pipeline with 1 heat-transfer pipe of condenser, to be constituted back Road；
The cooling water recirculation system includes the cooling water tank 13 with electric heater, and the outlet of cooling water tank 13 is through pipe Cooling tube bundle and heat-transfer pipe in road and the cooling water pump 12, temperature sensor and the valve that are installed on the pipeline and condenser 1 Entrance is connected, and the outlet of cooling tube bundle and heat-transfer pipe is by the road and the temperature sensor, valve and the cooling water that are installed on the pipeline Flowmeter 15 is connected with cooling water tank 13；Cooling water of the invention selects cooling medium for water or glycol water；Evaporation is full With temperature be -10-20 DEG C, condensation saturation temperature is 30-50 DEG C, test pressure is 0-2.5MPa；
Boiler air cooling chiller group and the air-cooled system of boiler are also connected on the boiler 10 and cooling water tank 13 Cold group.
Restrain outer Heat Transfer in Evaporating Falling Film and test refrigerant circulation principle: test tube bank is mounted in evaporator 2.Liquid refrigeration work Matter is charged in 1 bottom of condenser, flows into evaporator 2 after the pressurization of refrigerant pump 7.In test heating surface bank after liquid film distributor 14 Outer uniform falling liquid film, tests in heating surface bank and is passed through heating water, and refrigeration working medium becomes gaseous state from liquid, from top in the outer evaporation of tube bank Portion flows into condenser 1, and the refrigeration working medium not being evaporated returns to condenser 1 from 2 bottom of evaporator.Cooling tube is furnished in condenser 1 Beam is passed through cooling water in pipe.Condensation becomes liquid outside the tube bank of the gas phase refrigeration working medium flowed into from falling film evaporator within the condenser Body is again introduced into the cyclic process of refrigeration working medium.Two pairs of visualization windows, observable are evenly equipped in falling film evaporator and condenser The distribution situation of different location liquid film in Heat Transfer in Evaporating Falling Film test process.Cooling tube bundle is arranged on condenser top, will be evaporated to Condenser bottom is stored in after the refrigerant condensation of gas phase.In test process, the saturation temperature in system remains constant, condenser Effect is saturation temperature needed for falling film evaporation and pressure in maintenance system.
Full liquid single tube Pool Boiling Heat Transfer tests refrigerant circulation principle: pool Boiling Heat Transfer test heat-transfer pipe is mounted on condenser Bottom.Heat-transfer pipe installation compresses sealing using screw thread, is easy to install and remove.Refrigeration working medium is charged in condenser bottom, boiling Hot water is passed through in heat-transfer pipe, refrigerant boiling heat transfer outside heat-transfer pipe absorbs heat, becomes gas phase from liquid phase.Lead in cooling tube bundle Enter cooling water, the refrigerant for becoming gas phase becomes liquid phase in the outer condensation of tube bank, returns to condenser bottom under the effect of gravity.
Heat Transfer in Evaporating Falling Film and pool Boiling Heat Transfer share identical heat cycles water route.It is cold in pool Boiling Heat Transfer test Matchmaker's air pump inoperative, evaporator and condenser connecting pipeline valve are closed, and the heating surface bank water flow valve for being not involved in heat exchange is closed.
Membranaceous condensation heat transfer test loop principle outside horizontal tube bundle and single tube: cooling tube bundle is installed within the condenser, liquid The falling film evaporation outside the horizontal tube bundle of evaporator of phase refrigeration working medium becomes gas, flows into condenser.Gas phase refrigerant is within the condenser It is condensed outside heating surface bank and becomes liquid.In the condensation heat transfer performance of condensation process test heat-transfer pipe.It can be with testing tube row and liquid Influence of the film thickness for condensation heat transfer.Heating water provides required heat for system in falling film evaporation pipe row, maintains system institute The condensation saturation temperature needed.Condensation tube bank is also mountable in evaporator, and liquid phase refrigerant is added by the electricity of installation within the condenser Heat heating becomes steam, and exclusive condensation is managed in evaporator, tests its heat transfer coefficient.
When testing the film condensation heat transfer outside single tube, water route is closed by valve in remaining pipe row, only stays single tube water flowing i.e. It can carry out the condensation heat transfer test outside single tube.Test process refrigerant circulation principle is identical with outer condensation heat transfer experiment is restrained.
In an experiment, needing data to be tested includes: the refrigeration working medium gas phase temperature in evaporator, in condenser gas phase with And liquidus temperature, liquid film distributor entrance refrigerant temperature, environment temperature, out temperature, the temperature difference and the flow of cooling water are different Pipe row heats out temperature, the temperature difference and the flow of water, pressure and heat-transfer pipe water side pressure drop in evaporator and condenser Deng.The experiment data to be obtained include: different pipes arrange or the overall heat-transfer coefficient of single tube, pipe in convection transfer rate, pipe foreign minister Become the coefficient of heat transfer and water lateral resistance coefficient.Above-mentioned data accuracy to be tested directly influence heat transfer coefficient measurement not really Fixed degree, must improve temperature, pressure and the accuracy of flow measurement as far as possible.In addition, the length of heat exchanger tube should be greater than 0.5m.
Experiment test enter steady-state criterion: regulating water flow, electrical heating power or heating coolant-temperature gage, coolant water temperature, make be System reaches scheduled equalization point.If system pressure measured value corresponds to the variation of saturation temperature value less than 0.1 DEG C, together within ten minutes When the variation of cooling water (or heating water) inlet water temperature measured value be no more than 0.1 DEG C, then it is assumed that system has reached stable state.
Experimental system includes heating two water circulation systems of water and cooling water.Circulation waterway has Insulation along journey.It is logical Water flow can be divided equally by crossing water segregator, it is ensured that the flow flowed through between different test heat-transfer pipes is identical, and fluctuation is less than ± 0.1m/s.It is cold and hot It is equipped with air cooling chiller group and electric heating system in water tank, is adjusted and maintains the temperature in water tank within the scope of ± 0.1 DEG C.Root According to set temperature and heating amount requirement, electrical heating power can be carried out automatically controlling.
When completing falling film evaporation experiment, boiler heats water and is bypassed reflow tank through water pump pressurization a part, another Part returns to water tank after flowing through evaporator and refrigerant heat exchange.Cooling water flows through condenser, will return after the cooling condensation of gas phase refrigerant Recovery tank.
Water circulation system includes:
(1) boiler and cold water storage cistern each 1, volume need to meet system circulation needs, and water tank is 304 stainless steel inner containers, outside Add polyurethane insulation coating, insulation thickness is greater than 100mm.Water tank intermediate arrangement mixed flow baffle is, it can be achieved that Water in Water Tanks stream is sufficiently mixed It closes.If experiment test evaporation saturation temperature requires to be lower than 10 degrees Celsius, ethylene glycol can be charged in cold water storage cistern to meet experiment system System is cooling to be required.
(2) air cooling chiller group 2.Respectively cold water storage cistern and boiler provide reliable refrigerating capacity.Cold water storage cistern is experiment System provides chilled water.Boiler provides heating water for system.Cold water storage cistern and pure water tank configure electric heating system, can be continuous Adjust electrical heating power.Console installs digital electric power Parameters Instrument, can monitor the electrical heating power of water tank.Two water tank temperatures It can be achieved to automatically control after setting to keep water temperature constant.Boiler lower water temperature variation range: 1-60 DEG C, cold water storage cistern temperature :- 5-30℃。
Two water tanks use simultaneously, are maintained at institute by refrigeration unit, electric heater heating and temperature controller control water tank temperature Within the scope of it is required that.
Processing for Data Analysis in Physics
For restraining outer falling film evaporation heat exchange test:
In falling film evaporation heat exchange, the heat exchange amount of every heat-transfer pipe can be obtained by following formula:
It exchanges heat to cooling tube bundle, the heat exchange amount of every heat-transfer pipe can be obtained by following formula:
WhereinWithThe mass flow of water and cooling water is heated in respectively single tube bank.φe,mAnd φc,nRespectively For the evaporation and heat-exchange amount and condensing heat-exchange amount of single heat-transfer pipe.te,m,inAnd te,m,outThe inlet and outlet of respectively single heating water Temperature.tc,n,inAnd tc,n,outThe out temperature of respectively single cooling water.cp,mAnd cp,nAdd under average temperature in respectively managing The constant pressure specific heat of hot water and cooling water is held.
After obtaining the heat exchange amount of every heat-transfer pipe of heating tube and cooling tube, entire experiment system can be checked by following formula The thermal balance of system:
In above formula, φpFor the power of refrigerant pressurization canned motor pump, m and n are respectively to be mounted in falling film evaporator and condenser Heat-transfer pipe number, φaFor Average heat transfer amount, it is calculated by the following formula and obtains:
The overall heat-transfer coefficient calculation formula of every evaporation heat transfer pipe are as follows:
AoFor the outer surface heat exchange area of single heat transfer, Ao=π doL, doBe respectively with L enhanced tube embryonic tube outer diameter and Effectively heat exchange length.ΔTmIt is heat transfer temperature difference, calculating formula are as follows:
For evaporating operating condition:
Wherein, TsIt is evaporation saturation temperature.
The wherein heat flow density of single heat transfer are as follows:
In order to compare evaporation heat transfer coefficient of the different heat transfer pipe under different evaporating temperatures, it is also necessary to it is inside and outside right to find out pipe The occurrence of the coefficient of heat transfer is flowed, the composition of heat transfer process thermal resistance is obtained.In this way, the improvement to heat-transfer pipe performance, so that it may there is needle To property carry out.Therefore, it is necessary to be separated to the thermal resistance inside and outside pipe.
Convection transfer rate is calculated using Gnielinski formula in the pipe of light pipe:
In formula:
F=(1.82lgRe-1.64)-2
For doubly-enhanced tubes, then reinforcing times of the water side heat transfer coefficient with respect to light pipe is obtained by Wilson thermal resistance partition method Rate.It obtains after strengthening multiplying power, it can be by the coefficient of heat transfer and Nusselt number outside following two formulas computer tube:
Nusselt number:
Condensation heat transfer test outside tube bank and single tube is similar with the outer full-liquid type evaporation data processing method of single tube, single tube experiment Only pipe row in tube bank need to be changed to single tube and calculate thermal balance.
In conclusion the phase-change heat transfer coefficient of measuring enhanced tube includes two parts content: measuring single bilateral first Reinforcing multiplying power of the single-phase forced convection heat transfer coefficient relative to light pipe in enhanced tube pipe.Multiplying power is strengthened in tube bank can be by full outside single tube Liquid formula or condensation heat transfer test are to obtain.Secondly measurement enhanced tube single tube and the outer falling film evaporation of tube bank, condensation and full-liquid type evaporation The coefficient of heat transfer.
By differential pressure transmitter measure it is different in flow rate under water side pressure drop, heat-transfer pipe water lateral resistance coefficient can pass through following public affairs Formula calculates:
Wherein Δ p is the pressure drop between developmental tube inlet and outlet section, and L is then test segment length, umFor water flow velocity, ρ is Water density, diFor heat-transfer pipe embryonic tube internal diameter.
Thin film drainage state is characterized with Renault number of liquid membrane.Renault number of liquid membrane is defined as follows.
Wherein, the mass flow on unit pipe range is Γ (unilateral side), the mass flow on pipe range Lμ is power Viscosity/kgm-1·s-1。
Fig. 2 is the outer full-liquid type evaporation and heat-exchange experimental system circulation figure of Horizontal single-pipe.When the 1-4 valve of experimental system closes It closes, heating surface bank is not involved in heat exchange in evaporator 2, and experimental system is run under Horizontal single-pipe full-liquid type evaporating state.Test is full Liquid formula single tube is mounted on condenser bottom, is immersed in liquid phase refrigerant, and it is higher at least than at the top of heat-transfer pipe that refrigerant charges height 20mm.Heating moisture is passed through the full liquid single tube of test all the way out, takes 3 to be passed through cooling water in condensation tube bank in condenser, for cold It is solidifying to evaporate the refrigerant for becoming gas phase.
Fig. 3 is the outer full-liquid type evaporation heat transfer coefficient of experimental system testing level light pipe and Cooper formula contrast.In order to test Experiment can be tested full-liquid type boiling heat transfer coefficient and Cooper outside smooth single tube and carried out pair by the reliability of confirmatory test system Than.In heat flow density 10-40kW/m2In the range of, the deviation of test data of experiment and the formula should be less than ± 15%.
Membranaceous condensation heat transfer coefficient and the comparison of Nusselt Theory Solution outside Fig. 4 experimental system testing level light pipe.In order to verify The reliability of pilot system, can also will experiment test outside smooth single tube membranaceous condensation heat transfer coefficient and Nusselt Theory Solution into Row comparison.In heat flow density 10-40kW/m2In the range of, the deviation of test data of experiment and the formula should be less than ± 15%.
Fig. 5 experimental system tests water sidelight slip pipe internal resistance force coefficient and Filonenko formula contrast.For confirmatory experiment system Unified test tries the reliability of water lateral resistance coefficient, can be public by flow resistance coefficient experimental results in smooth tube and Filonenko Formula compares.In the range of in-pipe flow speed 1.0-4.0m/s, the deviation of test data of experiment and the formula should be less than ± 10%.
The exclusive Heat Transfer in Evaporating Falling Film coefficient of Fig. 6 experimental system testing tube.The transformable parameter of experimentation includes that hot-fluid is close Degree, liquid film flow, in-pipe flow speed.By changing parameter, in heat flow density 20kW/m2, the exclusive falling film evaporation biography of difference pipe Hot coefficient such as Fig. 6.

Claims (8)

  1. The test device 1. horizontal tube bundle and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change exchange heat, feature exist In: including refrigerant circulation, heating water and cooling water recirculation system；
    The refrigerant-cycle systems include the condenser (1) with pressure sensor and the evaporator with pressure sensor (2), condenser (1) top is disposed with cooling tube bundle, bottom is disposed with heat-transfer pipe, condenser (1) is interior to be stored with liquid phase refrigeration Agent, condenser (1) bottom refrigerant exit is by being equipped in pipeline and evaporator (2) of cold medium flux meter (5) and No.1 valve The liquid film distributor (14) at top is connected, and test tube bank is mounted on the lower end of the interior liquid film distributor (14) of evaporator (2), evaporator (2) top refrigerant exit is connected by pipeline and No. two valves being installed on the pipeline with condenser (1), evaporator (2) bottom Portion's refrigerant exit is connected by pipeline and No. three valves being installed on the pipeline with condenser (1)；
    The heating water circulating system includes boiler (10), and the outlet of boiler (10) by the road and is installed on the pipeline Electromagnetic flowmeter (3) and temperature sensor are connected with the testing tube beam entrance in evaporator (2), test tube bank outlet by the road and Temperature sensor on pipeline is connected with the entrance of boiler (10)；
    The boiler (10), which is also connected by pipeline and the valve being installed on the pipeline with condenser (1) heat-transfer pipe, to be constituted back Road；
    The cooling water recirculation system includes cooling water tank (13), and the outlet of cooling water tank (13) by the road and is mounted on pipeline On temperature sensor and valve be connected with the entrance of cooling tube bundle and heat-transfer pipe in condenser (1), cooling tube bundle and heat transfer Pipe exports the temperature sensor, valve and the cooling water flow meter (15) that by the road and are installed on the pipeline and cooling water tank (13) It is connected.
  2. 2. horizontal tube bundle according to claim 1 and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change are changed Heat test device, it is characterised in that: the installation site of the evaporator (2) is higher than condenser (1).
  3. 3. horizontal tube bundle according to claim 1 and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change are changed Heat test device, it is characterised in that: condenser (1), boiler (10) and the cooling water tank (13) is interior to be separately installed with electricity Boiler air cooling chiller group is also connected on heater, the boiler (10) and cooling water tank (13).
  4. 4. horizontal tube bundle according to claim 1 and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change are changed Heat test device, it is characterised in that: be also equipped with exhaust valve (6) on the evaporator (2).
  5. 5. horizontal tube bundle according to claim 1 and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change are changed Heat test device, it is characterised in that: be separately installed with heating on the boiler (10) and cooling water tank (13) export pipeline Water pump (9) and cooling water pump (12).
  6. 6. horizontal tube bundle according to claim 1 and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change are changed Heat test device, it is characterised in that: filling refrigerant inlet (8) and refrigerant recovering valve are additionally provided on the condenser (1) (11)。
  7. 7. horizontal tube bundle according to claim 1 and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change are changed Heat test device, it is characterised in that: refrigerant pump (7) are also equipped on the refrigerant exit pipeline of the condenser (1), in refrigerant The bypass with No. four valves being connected with condenser (1) is also connected on pump (7) entrance pipe.
  8. 8. horizontal tube bundle according to claim 1 and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change are changed Heat test device, it is characterised in that: the cooling water recirculation system selects cooling medium for water or glycol water；Evaporation Saturation temperature is -10-20 DEG C, condensation saturation temperature is 30-50 DEG C, test pressure is 0-2.5MPa.
CN201710453004.9A 2017-06-15 2017-06-15 Horizontal tube bundle and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change heat exchange test device Active CN107192571B (en)

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