CN103105021B - CO 2the refrigerating heat pump unit of trans critical cycle and control method thereof - Google Patents
CO 2the refrigerating heat pump unit of trans critical cycle and control method thereof Download PDFInfo
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- CN103105021B CN103105021B CN201310022945.9A CN201310022945A CN103105021B CN 103105021 B CN103105021 B CN 103105021B CN 201310022945 A CN201310022945 A CN 201310022945A CN 103105021 B CN103105021 B CN 103105021B
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- choke valve
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- gas cooler
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Abstract
The invention belongs to Trans-critical cycle CO
2refrigerating heat pump technical field.CO
2the refrigerating heat pump unit of trans critical cycle, comprises CO
2coolant compressor, gas cooler, regenerator, choke valve I, gas-liquid separator, choke valve II, evaporimeter, controller, pressure sensor, temperature sensor and overtemperature sensor, each parts connect into a closed-system by pipeline: controller is according to the highest cooling pressure Pg of the gas cooler inner refrigerant pressure, gas cooler outlet refrigerant temperature, Refrigerant Superheat at Evaporator Outlet and the system cloud gray model that detect, control the aperture of choke valve I and choke valve II, unit is run under high cycle efficieny.The invention has the beneficial effects as follows: when environment temperature or cooled between environment temperature change time, controller can regulate unit that unit is run under high cycle efficieny, and method is simple, be easy to realize, and reliably, stable.
Description
Technical field
The invention belongs to Trans-critical cycle CO
2refrigerating heat pump technical field.
Background technology
Because CFCs is for the material impact of ozone layer and atmospheric warming, protection of the environment realizes CFCs and substitutes the problem becoming the whole world and jointly pay close attention to.HFCs class cold-producing medium substituting as CFCs, although do not damage the ozone layer, its obvious greenhouse effects, or environment is warmed have a certain impact.So people start to advocate use natural refrigerant energetically.CO
2natural refrigerant is subject to extensive concern again, CO
2the research and apply of refrigerating heat pump device becomes again valued focus in the world.
Trans-critical cycle CO of the prior art
2refrigeration system mainly comprises compressor, cooler, regenerator, choke valve, gas-liquid separator, evaporimeter etc., the Trans-critical cycle CO of prior art
2the deficiency of refrigeration system is: when the environment residing for system changes, the distribution of refrigerant in system can change, due to the HTHP CO in gas cooler
2cold-producing medium can not liquefy, and cause the distribution of refrigerant in all parts comparatively large on the impact of system pressure, the high-low pressure of refrigeration system regulates difficulty; Due to Trans-critical cycle CO
2temperature and pressure be not one_to_one corresponding, supercritical CO
2heat release in cooler, variations in temperature is very large, and the temperature difference imported and exported by larger cooler makes trans critical cycle efficiency improve, different outlet temperatures, and the optimum cooling pressure of correspondence one makes cycle efficieny the highest.So when environment temperature change cause gas cooler exit temperature to change time, corresponding adjustment can not be made to cooling pressure, to ensure that refrigeration system has the higher coefficient of performance, and with subcritical cycle unlike, cooling pressure is not more low better, but for different outlet temperatures, there is an optimal value, therefore, difficulty is regulated.
Summary of the invention
The present invention, for solving the problem and proposing, its object is to provide a kind of CO
2the refrigerating heat pump unit of trans critical cycle, it is reasonable, brief compact that unit is arranged; The present invention also provides CO in addition
2the control method of the refrigerating heat pump unit of trans critical cycle, by the control to system cools pressure, maintains system optimization and runs.
Technical scheme of the present invention is: CO
2the refrigerating heat pump unit of trans critical cycle, comprises CO
2coolant compressor, gas cooler, regenerator, choke valve I, gas-liquid separator, choke valve II, evaporimeter and controller, it is characterized in that: unit also comprises pressure sensor, temperature sensor and overtemperature sensor, described each parts connect into a closed-system by pipeline: exhaust outlet of compressor is connected with gas cooler import, gas cooler outlet is connected with regenerator import I, regenerator outlet I is divided into two-way, one tunnel is connected with evaporator after choke valve II, another road is connected with gas-liquid separator air inlet pipe through choke valve I, gas-liquid separator top escape pipe is communicated with the pipeline that choke valve II is connected with evaporator, bottom gas-liquid separator, drain pipe is communicated with the pipeline that choke valve II is connected with evaporator, evaporator outlet is connected with regenerator import II, regenerator outlet II is connected with compressor air suction mouth, pressure sensor is arranged on the pipeline that exhaust outlet of compressor is connected with gas cooler import, temperature sensor is arranged on gas cooler and exports on the pipeline that is connected with regenerator import I, overtemperature sensor setting is on the pipeline of evaporator outlet, pressure sensor, overtemperature sensor is connected with controller by holding wire with temperature sensor.
Described choke valve I (4) is electric control valve, and choke valve II (6) is electric control valve or mechanical type control valve.
CO of the present invention
2the control method of the refrigerating heat pump unit of trans critical cycle, it is characterized in that described control method is: the highest cooling pressure Pg of the gas cooler outlet refrigerant temperature tk that the gas cooler inner refrigerant pressure P k that controller detects according to pressure sensor, temperature sensor detect, Refrigerant Superheat at Evaporator Outlet that overtemperature sensor detects and system cloud gray model, controls the aperture of choke valve I and choke valve II; Choke valve I specifically controls; Setting optimum pressure is Pz, Pz=-0.71471+0.27243tk, and Pk, Pg, Pz tri-parameters compare by controller: as Pz≤Pg, and during Pk > Pz, controller output signal controls choke valve I valve port opening and opens greatly, makes Pk=Pz; As Pz≤Pg, and during Pk < Pz, controller output signal controls choke valve I valve port opening and turns down, and makes Pk=Pz; As Pz > Pg, and during Pk > Pg, controller output signal controls choke valve I valve port opening and opens greatly, makes Pk=Pg; As Pz > Pg, and during Pk < Pg, controller output signal controls choke valve I valve port opening and turns down, and makes Pk=Pg; Choke valve II specifically controls; Refrigerant superheat degree setting value is tz, when the degree of superheat is higher than setting value tz, drives large choke valve II, makes refrigerant superheat degree convergence setting value tz, when the degree of superheat is lower than setting value tz, turns down choke valve II, makes refrigerant superheat degree convergence setting value tz.
Process of refrigerastion of the present invention is:
CO
2compressor sucks refrigerant gas, discharges high temperature and high pressure gas and enter in gas cooler after compression, enters in regenerator and again cools, cooled CO after gas cooler cooling
2cold-producing medium is respectively by two choke valves of parallel connection: choke valve I and choke valve II throttling, cold-producing medium becomes gas-liquid two-phase CO through choke valve II throttling
2enter into evaporimeter heat absorption vaporization, another road becomes gas-liquid two-phase CO through choke valve I throttling
2enter into gas-liquid separator, freeze respectively through entering into evaporimeter after the refrigerant mixed after the top and bottom interface pipeline of gas-liquid separator and choke valve II again, the rear cold-producing medium of refrigeration becomes low-temp low-pressure gas-liquid mixture and enters into evaporimeter, regenerator is entered into after evaporator heat absorption becomes overheated gas, with gas cooler refrigerant heat exchanger out in regenerator, temperature enters into compressor suction after raising, and so circulates.The present invention carrys out regulating system distribution of refrigerant by two-way throttling, thus regulating system pressure remains on optimal design operating mode.The choke valve II major control evaporator outlet degree of superheat, prevent overfeeding from causing compressor hydraulic compression or degree of superheat heat exchange efficiency bigger than normal to decline, functional equivalent is in the choke valve of conventional refrigerant system; Choke valve I mainly carrys out the distribution of cold-producing medium in regulating system according to cooling pressure, when cooling pressure is too high, choke valve leaves greatly, refrigerant outflow in cooler is increased, and is stored in gas-liquid separator with liquid state after throttling; When cooling pressure is too low, choke valve I turns down, and in cooler, refrigerant outflow reduces, but the continuous air-breathing of compressor, the liquid refrigerant stored in gas-liquid separator progressively supplements and cooling pressure is improved, and gas-liquid separator is equivalent to the cushion space that cold-producing medium stores.
Pass through the present invention, when residing for environment residing for evaporimeter or gas cooler, environment changes, refrigerating heat pump unit can according to the high side pressure of the exit refrigerant superheat degree of evaporimeter, system and gas cooler exit temperature, by Systematical control stable operation under the evaporating temperature and high-pressure of the best, thus improve the cooling effectiveness of system, effectively can prevent the abnormal increase of high side pressure simultaneously.
The invention has the beneficial effects as follows: when environment temperature or cooled between environment temperature change time, the temperature that controller can detect at the outlet temperature sensor of gas cooler according to cold-producing medium and judge at the pressure that the pressure sensor of gas cooler import department detects and regulate unit that unit is run under high cycle efficieny: method is simple, be easy to realize, and reliably, stable.
Accompanying drawing explanation
Fig. 1 is refrigerating heat pump machine set system schematic diagram of the present invention.
In accompanying drawing:
1-compressor; 2-gas cooler; 3-regenerator; 4-choke valve I; 5-gas-liquid separator; 6-
Choke valve II; 7-drain pipe; 8-air inlet pipe; 9-escape pipe; 10-evaporimeter; 11-pressure sensor; 12-controller; 13-temperature sensor; 14-overtemperature sensor.
Detailed description of the invention
Below, reference drawings and Examples are to the detailed description of the invention.
Trans-critical cycle CO
2chiller refrigeration source pump comprises CO
2coolant compressor 1, gas cooler 2, regenerator 3, choke valve I 4, gas-liquid separator 5, choke valve II 6, evaporimeter 10, controller 12, pressure sensor 11, temperature sensor 13 and overtemperature sensor 14, each parts connect into a closed-system by pipeline: compressor 1 exhaust outlet is connected with gas cooler 2 import, gas cooler 2 exports and is connected with regenerator 3 import I, regenerator 3 exports I and is divided into two-way, one tunnel is connected with evaporator after choke valve II 6, another road is connected with gas-liquid separator 5 entrance through choke valve I 4, gas-liquid separator 5 top escape pipe is communicated with the pipeline that choke valve II 6 is connected with evaporator, bottom gas-liquid separator, drain pipe is communicated with the pipeline that choke valve II 6 is connected with evaporator, evaporimeter 10 exports and is connected with regenerator 3 import II, regenerator 3 exports II and is connected with compressor 1 air entry, pressure sensor 11 is connected on the pipeline that compressor 1 exhaust outlet is connected with gas cooler 2 import, temperature sensor 13 is arranged on gas cooler 2 and exports on the pipeline that is connected with regenerator 3 import I, overtemperature sensor 14 is connected on the pipeline of evaporimeter 10 outlet, pressure sensor 11, overtemperature sensor 14 is connected with controller by holding wire with temperature sensor 13.
The high temperature and high pressure gas of discharging from the high-pressure side blast pipe of compressor 1 enters into gas cooler 2, quilt
Be cooled to supercritical fluid, gas cooler 2 supercritical fluid out enters into regenerator 3 li, carry out heat exchange with from evaporimeter 10 cold-producing medium out, the cold-producing medium after temperature reduces is divided into two-way, and wherein a road becomes saturated gas-liquid two-phase CO through choke valve II 6 throttling
2cold-producing medium enters into evaporimeter 10 and carries out sweat cooling, and another road becomes saturated gas-liquid two-phase CO through choke valve I 4 throttling
2enter into gas-liquid separator 5, cold-producing medium carries out sweat cooling by entering into evaporimeter 10 after drain pipe bottom gas-liquid separator 57 and its top escape pipe 9 and choke valve II 6 exit refrigerant mixed.
When residing for refrigerating heat pump device, environment changes, cold-producing medium is caused to change in the state of systemic circulation, the evaporimeter 10 that the gas cooler 2 outlet refrigerant temperature tk that the gas cooler 2 inner refrigerant pressure P k that controller 12 detects according to pressure sensor 11, temperature sensor 13 detect, overtemperature sensor 14 detect exports the highest cooling pressure Pg of refrigerant superheat degree and system cloud gray model, controls the aperture of choke valve I 4 and choke valve II 6; Choke valve I 4 specifically controls; Setting optimum pressure is Pz, Pz=-0.71471+0.27243tk, Pk, Pg, Pz tri-parameters compare by controller 12: as Pz≤Pg, and during Pk > Pz, controller 12 outputs signal control choke valve I 4 valve port opening and opens greatly, makes Pk=Pz; As Pz≤Pg, and during Pk < Pz, controller 12 outputs signal control choke valve I 4 valve port opening and turns down, and makes Pk=Pz; As Pz > Pg, and during Pk > Pg, controller 12 outputs signal control choke valve I 4 valve port opening and opens greatly, makes Pk=Pg; As Pz > Pg, and during Pk < Pg, controller 12 outputs signal control choke valve I 4 valve port opening and turns down, and makes Pk=Pg; Choke valve II 6 specifically controls; Refrigerant superheat degree setting value is tz, when the degree of superheat is higher than setting value tz, drives large choke valve II 6, makes refrigerant superheat degree convergence setting value tz, when the degree of superheat is lower than setting value tz, turns down choke valve II 6, makes refrigerant superheat degree convergence setting value tz.
Be more than an embodiment of the invention, the present invention is not limited only to this.Such as, in the present embodiment, compressor (1) can single machine two-stage, also can be unit single-stage; Choke valve II (6) can be electrodynamic type, also can be mechanical type; The form of gas cooler (2) and evaporimeter (10) can be the various forms such as air-source formula, water source type, and the pipe arrangement formation etc. in above-mentioned embodiment is not limited thereto.
Claims (3)
1.CO
2the refrigerating heat pump unit of trans critical cycle, comprises CO
2coolant compressor (1), gas cooler (2), regenerator (3), choke valve I (4), gas-liquid separator (5), choke valve II (6), drain pipe (7), air inlet pipe (8), escape pipe (9), evaporimeter (10) and controller (12), is characterized in that: described CO
2the refrigerating heat pump unit of trans critical cycle also comprises pressure sensor (11), temperature sensor (13) and overtemperature sensor, described each parts connect into a closed-system by pipeline: compressor (1) exhaust outlet is connected with gas cooler (2) import, gas cooler (2) outlet is connected with regenerator (3) import I, regenerator (3) outlet I is divided into two-way, one tunnel is connected with evaporator after choke valve II (6), another road is connected with gas-liquid separator air inlet pipe (8) through choke valve I (4), gas-liquid separator (5) top escape pipe (9) is communicated with the pipeline that choke valve II (6) is connected with evaporator, gas-liquid separator (5) bottom drain pipe (7) is communicated with the pipeline that choke valve II (6) is connected with evaporator, evaporimeter (10) outlet is connected with regenerator (3) import II, regenerator (3) outlet II is connected with compressor (1) air entry, pressure sensor (11) is arranged on the pipeline that compressor (1) exhaust outlet is connected with gas cooler (2) import, temperature sensor (13) is arranged on gas cooler (2) and exports on the pipeline that is connected with regenerator (3) import I, overtemperature sensor (14) is arranged on the pipeline that evaporimeter (10) exports, pressure sensor (11), overtemperature sensor (14) is connected with controller by holding wire with temperature sensor (13).
2. CO according to claim 1
2the refrigerating heat pump unit of trans critical cycle, is characterized in that described choke valve I (4) is electric control valve, and choke valve II (6) is electric control valve or mechanical type control valve.
3. CO described in claim 1
2the control method of the refrigerating heat pump unit of trans critical cycle, it is characterized in that described control method is: evaporimeter (10) the outlet refrigerant superheat degree that gas cooler (2) the outlet refrigerant temperature tk that gas cooler (2) the inner refrigerant pressure P k that controller (12) detects according to pressure sensor (11), temperature sensor (13) detect, overtemperature sensor (14) detect and the highest cooling pressure Pg of system cloud gray model, control the aperture of choke valve I (4) and choke valve II (6); Choke valve I (4) specifically controls; Setting optimum pressure is Pz, Pz=-0.71471+0.27243tk, Pk, Pg, Pz tri-parameters compare by controller (12): as Pz≤Pg, and during Pk > Pz, controller (12) output signal controls choke valve I (4) valve port opening and opens greatly, makes Pk=Pz; As Pz≤Pg, and during Pk < Pz, controller (12) output signal controls choke valve I (4) valve port opening and turns down, and makes Pk=Pz; As Pz > Pg, and during Pk > Pg, controller (12) output signal controls choke valve I (4) valve port opening and opens greatly, makes Pk=Pg; As Pz > Pg, and during Pk < Pg, controller (12) output signal controls choke valve I (4) valve port opening and turns down, and makes Pk=Pg; Choke valve II (6) specifically controls; Refrigerant superheat degree setting value is tz, when the degree of superheat is higher than setting value tz, drives large choke valve II (6), make refrigerant superheat degree convergence setting value tz, when the degree of superheat is lower than setting value tz, turn down choke valve II (6), make refrigerant superheat degree convergence setting value tz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310022945.9A CN103105021B (en) | 2013-01-22 | 2013-01-22 | CO 2the refrigerating heat pump unit of trans critical cycle and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310022945.9A CN103105021B (en) | 2013-01-22 | 2013-01-22 | CO 2the refrigerating heat pump unit of trans critical cycle and control method thereof |
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| CN103105021A CN103105021A (en) | 2013-05-15 |
| CN103105021B true CN103105021B (en) | 2015-12-09 |
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| CN105444476A (en) * | 2015-12-29 | 2016-03-30 | 珠海格力电器股份有限公司 | Heat exchange system |
| CN105698454B (en) * | 2016-03-11 | 2017-12-08 | 西安交通大学 | A kind of control method of transcritical CO_2 heat pump optimum pressure |
| CN107364564B (en) * | 2017-07-21 | 2023-07-25 | 天津商业大学 | Absorption-type and thermoelectric refrigeration CO-assisted supercooling CO 2 Refrigerating system for ship |
| CN108180666A (en) * | 2018-01-31 | 2018-06-19 | 天津商业大学 | CO is subcooled in a kind of non-azeotropic working medium mechanical-assisted2Cooling and warming integral system |
| CN108180667A (en) * | 2018-01-31 | 2018-06-19 | 天津商业大学 | CO is subcooled in a kind of mechanical-assisted2Trans-critical cycle cooling and warming integral system |
| CN109307376A (en) * | 2018-10-09 | 2019-02-05 | 合肥丰蓝电器有限公司 | A kind of high-temperature space supplies colod-application Condensing units |
| CN109425141A (en) * | 2018-12-06 | 2019-03-05 | 中车大连机车研究所有限公司 | A kind of carbon dioxide air-conditioning and pressure control and guard method |
| CN109751784B (en) * | 2018-12-29 | 2020-01-10 | 西安交通大学 | Parallel flow evaporator carbon dioxide system and operation method thereof |
| CN110160294A (en) * | 2019-05-17 | 2019-08-23 | 中车大连机车研究所有限公司 | One kind being used for CO2The control method for electronic expansion valve of refrigerant air-conditioning |
| CN112728799B (en) * | 2020-12-09 | 2021-12-10 | 上海交通大学 | Based on CO2Flash evaporation system of mixed refrigerant |
| CN114576880A (en) * | 2022-03-24 | 2022-06-03 | 山东阿尔普尔节能装备有限公司 | Single-machine two-stage screw compression ultra-large ultralow temperature air source heat pump unit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5435145A (en) * | 1994-03-03 | 1995-07-25 | General Electric Company | Refrigerant flow rate control based on liquid level in simple vapor compression refrigeration cycles |
| CN1162667C (en) * | 2003-04-10 | 2004-08-18 | 上海交通大学 | Throttle control mechanism of cross-critical CO2 refrigerating system |
| CN100570245C (en) * | 2004-05-20 | 2009-12-16 | 上海交通大学 | Critical-cross carbon dioxide refrigeration system fully mechanical throttling controlling organization |
| CN101240962B (en) * | 2008-01-18 | 2010-06-02 | 西安交通大学 | Carbon dioxide heat pump control method based on pressure-temperature |
| CN203036904U (en) * | 2013-01-22 | 2013-07-03 | 秦海涛 | Refrigerating heat pump unit for CO2 trans-critical cycle |
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