CN101307974A - Steam compression refrigerating cycle dry-type evaporator exit status measurement method and device - Google Patents
Steam compression refrigerating cycle dry-type evaporator exit status measurement method and device Download PDFInfo
- Publication number
- CN101307974A CN101307974A CNA2008100403740A CN200810040374A CN101307974A CN 101307974 A CN101307974 A CN 101307974A CN A2008100403740 A CNA2008100403740 A CN A2008100403740A CN 200810040374 A CN200810040374 A CN 200810040374A CN 101307974 A CN101307974 A CN 101307974A
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- temperature sensor
- temperature
- dry
- dry evaporator
- electric heater
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- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/01—Heaters
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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
Abstract
The invention discloses a method and a device for measuring outlet states of a dry evaporator in a vapor compression refrigeration cycle. The invention is characterized in that: an electric heater and a first temperature sensor are arranged on the wall surface of an outlet copper pipe of the dry evaporator; the temperature of a point is measured by the temperature sensor; a second temperature sensor is arranged on an advanced position of the first temperature sensor and measures the back temperature; the temperature of the point provided with the heater and the back temperature are respectively input in a comparer to calculate temperature difference; according to the temperature difference, the outlet state of the dry evaporator is judged whether the outlet state is overheat vapor or roridous wet vapor; a judge signal output by the comparer is input in a controller; the judgment of the overheat vapor or the roridous wet vapor is taken as a feedback signal of an expanding valve-dry evaporator control circuit in the vapor compression refrigeration cycle to adjust the opening degree of the expanding valve positioned on an inlet of the dry evaporator; the method and the device are suitable for the vapor compression refrigeration cycle.
Description
Technical field
The present invention relates to dry-type evaporator exit status measurement method and device in a kind of vapor-compression refrigerant cycle.
Background technology
In the steam compression type refrigeration cyclic process, the control of dry evaporator outlet refrigerant condition is quite important: on the one hand, in order to prevent compressor generation liquid hammer, the outlet refrigerant condition requires to have certain degree of superheat; On the other hand, for the heat exchange area that makes full use of evaporimeter, improve heat exchanger efficiency, the degree of superheat of outlet refrigerant condition requires as much as possible little, sometimes in order to control suitable delivery temperature, even requires the outlet refrigerant condition that some humidity is arranged.At present, heating power expansion valve and electric expansion valve are mainly used in the control of the outlet refrigerant condition of dry evaporator, expansion valve-dry evaporator the control loop of what type no matter all is to adopt the feedback signal of the degree of superheat (suction temperature and evaporating temperature poor) as dry evaporator outlet refrigerant condition; But according to the development and change of gas-liquid two-phase flow model formula in the pipe, along with the progressively increase of evaporimeter liquid supply rate, the flow of refrigerant state of dry evaporator outlet is approached to saturated by superheated steam, and the degree of superheat is more and more littler, measures relatively difficulty accurately; Therefore for the security of operation that guarantees compressor and the heat exchange efficiency of evaporimeter, need in time, accurately, whether the method outlet of measuring evaporimeter reliably be near the saturation state.
Summary of the invention
The present invention will solve in the steam compression type refrigeration cyclic process, the technical problem that dry evaporator outlet refrigerant condition is measured, and dry-type evaporator exit status measurement method and device in a kind of vapor-compression refrigerant cycle are provided.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
Dry-type evaporator exit status measurement method in a kind of vapor-compression refrigerant cycle, characteristics are that concrete steps are as follows:
1. arrange an electric heater and first temperature sensor at dry evaporator outlet copper pipe wall, be equipped with this temperature of heater by this first temperature sensor measurement;
2. at the first temperature sensor upstream arrangement, second temperature sensor, by the suction temperature of this second temperature sensor measurement by the dry evaporator outlet;
3. will be equipped with this temperature of heater and be input to a comparator respectively from two ends and calculate its temperature difference by the suction temperature that dry evaporator exports;
4. controller judges that dry-type evaporator exit status is a superheated steam, still vaporific moist steam according to temperature difference size;
5. with the judgement of step 4 feedback signal, the aperture of regulating the expansion valve that places the dry evaporator inlet as expansion valve-dry evaporator control loop in the steam compression type refrigeration circulation.
A kind of for realizing the device of said method, be characterized in that it comprises: electric heater, constant-current source, first temperature sensor, second temperature sensor, comparator, controller, expansion valve, electric heater places on the dry evaporator outlet copper pipe wall, constant-current source is connected with electric heater, provide constant exciting current to electric heater by constant-current source, first temperature sensor places the electric heater place, measure the temperature of this point, second temperature sensor places the upstream of first temperature sensor, measure the suction temperature in dry evaporator exit, first, two inputs of second temperature sensor and comparator are connected, the output of comparator is connected with controller, controller output connects the expansion valve connection that places dry type evaporation arrival end, is used for controlling the aperture of expansion valve.
Beneficial effect of the present invention is: can determine the dry evaporator outlet by the transition point of superheated steam to vaporific moist steam, at this moment, and heat exchange efficiency the best of evaporimeter, the while has guaranteed the safety in operation of compressor again; In addition, avoid evaporating temperature and the issuable systematic error of suction temperature comparison method in actual use, also do not needed the higher pressure sensor of cost.
Description of drawings
Fig. 1 is the hot type induction measurement devices sketch of invention.
The specific embodiment
Dry-type evaporator exit status measurement method in a kind of vapor-compression refrigerant cycle, concrete steps are as follows:
1. arrange an electric heater 5 and first temperature sensor 6 at dry evaporator 3 outlet copper pipe walls, measure this temperature T that is equipped with heater 5 by this first temperature sensor 6
H
2. at first temperature sensor, 6 upstream arrangement, second temperature sensor 4, measure the suction temperature T that exports by dry evaporator 3 by this second temperature sensor 4
S
3. will be equipped with this temperature T of heater 5
HWith suction temperature T by dry evaporator 3 outlets
SBe input to a comparator 9 respectively from two ends and calculate its temperature difference T=T
H-T
S
4. controller 1 is according to temperature difference T size, judges that dry evaporator 3 discharge states are superheated steams, still vaporific moist steam, and when the temperature difference during greater than 20K, dry evaporator 3 discharge states are superheated steams; When the temperature difference during less than 5K, dry evaporator 3 discharge states are vaporific moist steams; When temperature difference circle was between 5K-20K, dry evaporator 3 discharge states were in the transition state between superheated steam and the vaporific moist steam;
5. controller 1 is with the judgement of step 4 feedback signal as expansion valve-dry evaporator control loop in the steam compression type refrigeration circulation, adjusting places the aperture of the electric expansion valve of dry evaporator inlet, when dry evaporator 3 discharge states are superheated steam, and the degree of superheat is during greater than 4K; Increase the aperture of electric expansion valve; When dry evaporator 3 discharge states are vaporific moist steam, reduce electronic expansion valve opening; When dry evaporator 3 discharge states are superheated steam, and degree of superheat circle is between 2K-4K the time; Keep the aperture of electric expansion valve constant.
A kind of for realizing the device of said method, be characterized in that it comprises: electric heater 6, constant-current source 7, first temperature sensor 6, second temperature sensor 4, comparator 9, controller 1, electric expansion valve 2, electric heater 5 places on the dry evaporator 3 outlet copper pipe walls, constant-current source 7 is connected with electric heater 5, provide constant exciting current to electric heater 5 by constant-current source 7, first temperature sensor 6 places electric heater 5 places, measures the temperature T of this point
H, second temperature sensor 4 places the upstream of first temperature sensor 6, measures the suction temperature T in dry evaporator 3 exits
S, two inputs of first temperature sensor 6, second temperature sensor 4 and comparator 9 are connected, and the output of comparator 9 is connected with controller 1, and controller 1 output connects the expansion valve 2 that places dry evaporator 3 arrival ends and connects, and is used for controlling the aperture of expansion valve 2.First, second temperature sensor in the present embodiment adopts film-type Pt100 thermal resistance, controller 1 employing to have the Pt100 input, and PID calculates, and electric expansion valve drives the controller of functions such as control.
The hot type measurement of inductance is a theoretical foundation with the heat balance principle of endogenous pyrogen object in fluid, heat should equal the heat dissipation capacity of object in fluid in when being thermal balance, therefore, the temperature of object is relevant with factors such as flow rate of fluid, temperature, density, gas phase or liquid phases during thermal balance, generally be used for rate of flow of fluid and measure, also can be used to differentiate the gas phase and the liquid phase of fluid.
This measuring method and device are applicable to expansion valve-dry evaporator control loop in the steam compression type refrigeration circulation, as feedback signal, are applicable to the steam compression type refrigeration circulation.
Claims (2)
1. dry-type evaporator exit status measurement method in the vapor-compression refrigerant cycle is characterized in that the method concrete steps are:
1) arranges an electric heater and first temperature sensor at dry evaporator outlet copper pipe wall, be equipped with this temperature of heater by this first temperature sensor measurement;
2) at the first temperature sensor upstream arrangement, second temperature sensor, by the suction temperature of this second temperature sensor measurement by the dry evaporator outlet;
3) will be equipped with this temperature of heater and the suction temperature by dry evaporator outlet is input to a comparator respectively and calculates its temperature difference from two ends;
4) controller judges that dry-type evaporator exit status is a superheated steam, still vaporific moist steam according to temperature difference size;
5) with the judgement of step 4) feedback signal, the aperture of regulating the expansion valve that places the dry evaporator inlet as expansion valve-dry evaporator control loop in the steam compression type refrigeration circulation.
2. one kind for realizing the device of the method that claim 1 is stated, be characterized in that it comprises: electric heater, constant-current source, first temperature sensor, second temperature sensor, comparator, controller, expansion valve, electric heater places on the dry evaporator outlet copper pipe wall, constant-current source is connected with electric heater, provide constant exciting current to electric heater by constant-current source, first temperature sensor places the electric heater place, measure the temperature of this point, second temperature sensor places the upstream of first temperature sensor, measure the suction temperature in dry evaporator exit, first, two inputs of second temperature sensor and comparator are connected, the output of comparator is connected with controller, controller output connects the expansion valve connection that places dry type evaporation arrival end, is used for controlling the aperture of expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100403740A CN101307974B (en) | 2008-07-09 | 2008-07-09 | Steam compression refrigerating cycle dry-type evaporator exit status measurement method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100403740A CN101307974B (en) | 2008-07-09 | 2008-07-09 | Steam compression refrigerating cycle dry-type evaporator exit status measurement method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101307974A true CN101307974A (en) | 2008-11-19 |
| CN101307974B CN101307974B (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100403740A Expired - Fee Related CN101307974B (en) | 2008-07-09 | 2008-07-09 | Steam compression refrigerating cycle dry-type evaporator exit status measurement method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104110921A (en) * | 2013-04-22 | 2014-10-22 | 东莞市德思环境仪器有限公司 | Refrigeration equipment energy output intelligent stepless control system |
| CN107076491A (en) * | 2014-10-24 | 2017-08-18 | 丹佛斯有限公司 | Select the control strategy for expansion valve |
| CN107850363A (en) * | 2015-08-03 | 2018-03-27 | 开利公司 | Thermostatic expansion valve and control method |
| CN109114852A (en) * | 2018-08-07 | 2019-01-01 | 珠海格力电器股份有限公司 | A kind of adjusting method of electric expansion valve, the equipment using this method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3638446A (en) * | 1969-06-27 | 1972-02-01 | Robert T Palmer | Low ambient control of subcooling control valve |
| EP0079331A4 (en) * | 1981-05-20 | 1984-09-28 | Richard H Alsenz | Method and apparatus for controlling operation of a thermostatic expansion valve. |
| US6164081A (en) * | 1996-11-19 | 2000-12-26 | Danfoss A/S | Process for regulating a refrigerating system, refrigerating system and expansion valve |
-
2008
- 2008-07-09 CN CN2008100403740A patent/CN101307974B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104110921A (en) * | 2013-04-22 | 2014-10-22 | 东莞市德思环境仪器有限公司 | Refrigeration equipment energy output intelligent stepless control system |
| CN107076491A (en) * | 2014-10-24 | 2017-08-18 | 丹佛斯有限公司 | Select the control strategy for expansion valve |
| US10352607B2 (en) * | 2014-10-24 | 2019-07-16 | Danfoss A/S | Selecting control strategy for an expansion valve |
| CN107076491B (en) * | 2014-10-24 | 2020-02-21 | 丹佛斯有限公司 | Selecting a control strategy for an expansion valve |
| CN107850363A (en) * | 2015-08-03 | 2018-03-27 | 开利公司 | Thermostatic expansion valve and control method |
| CN107850363B (en) * | 2015-08-03 | 2020-10-30 | 开利公司 | Thermostatic expansion valve and control method |
| US11371763B2 (en) | 2015-08-03 | 2022-06-28 | Carrier Corporation | Thermostatic expansion valves and methods of control |
| US11874038B2 (en) | 2015-08-03 | 2024-01-16 | Carrier Corporation | Thermostatic expansion valves and methods of control |
| CN109114852A (en) * | 2018-08-07 | 2019-01-01 | 珠海格力电器股份有限公司 | A kind of adjusting method of electric expansion valve, the equipment using this method |
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| Publication number | Publication date |
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| CN101307974B (en) | 2010-06-23 |
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