CN110030777A - A kind of control method for realizing best condensing pressure - Google Patents
A kind of control method for realizing best condensing pressure Download PDFInfo
- Publication number
- CN110030777A CN110030777A CN201910193196.3A CN201910193196A CN110030777A CN 110030777 A CN110030777 A CN 110030777A CN 201910193196 A CN201910193196 A CN 201910193196A CN 110030777 A CN110030777 A CN 110030777A
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- China
- Prior art keywords
- expansion valve
- pressure
- condensing pressure
- control
- control method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control 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
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/111—Fan speed control of condenser fans
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to a kind of control methods for realizing best condensing pressure, the DIGI-CFC module of the controller, which directly or indirectly controls expansion valve, is preferably minimized the drag losses of the expansion valve in maximum open position, the DIGI-CFC module calculates the best condensing pressure of unit operation at this time according to refrigerant flow, then realizes the best condensing pressure by control condenser fan.The beneficial effects of the present invention are: calculating the best condensing pressure of unit operation at this time according to refrigerant flow, then compressor lift and energy consumption are reduced to maintain best condensing pressure by control condenser fan.
Description
Technical field
The present invention relates to Heating,Ventilating and Air Conditioning, condenser control field in commercial and industrial refrigeration system, more particularly, to
A kind of control method maintaining best condensing pressure by control condenser fan.
Background technique
Traditional condenser fan control system is made of temperature and pressure sensor, and temperature sensor can be located at evaporator
Centre and condensator outlet at, pressure sensor can be located at condenser inlet at and condensator outlet at.Controller and compression
The linkage of machine state.If compressor is closed, controller should close condenser fan.In actual system operatio, (1) condensation pressure
The set point of power is usually bigger than minimum head pressure, and when condensing pressure is maintained at actual set level, expansion valve must be closed partially.
(2) refrigerant flow for flowing through expansion valve and liquid line is more much smaller than design value: carrying out compressor speed regulation using frequency converter；Fortune
Compressor number of units in row is less (multiple compressors are in parallel in a unit)；Use hot gas bypass；Cylinder capacity adjusts (living
Plug compressor)；Slide valve capacity regulating (screw compressor)；High-temp liquid or hot gas reheat；Hot gas bypasses high pressure
Valve.Under all of these conditions, refrigerant flow can be down to the 30% of expansion valve design discharge.When flow-reduction, it is required most
Small condensing pressure reduces.Compressor lift should be reduced accordingly.However in real system, compressor is run with declared working condition always,
Compressor horsepower is largely wasted in the process.Therefore, compressor horsepower can be significantly reduced in optimization condensing pressure.It needs
, it is noted that best condensing pressure or condensation temperature change with the variation of refrigerant flow.It is not fixed value.
Summary of the invention
The purpose of the present invention is to provide a kind of controller DIGI-CFC for condenser fan and realize best condensation
The device and control method of pressure, to solve the problems mentioned in the above background technology.
To achieve the above object, the invention provides the following technical scheme:
A kind of control method for realizing best condensing pressure, it is characterised in that: the DIGI-CFC module of the controller is straight
It connects or indirectly controlling expansion valve is preferably minimized the drag losses of the expansion valve in maximum open position, the DIGI-
CFC module calculates the best condensing pressure of unit operation at this time according to refrigerant flow, then by control condenser fan come real
The existing best condensing pressure.
Further, the DIGI-CFC module is according to the formula that refrigerant flow calculates best condensing pressure:
Pset=Pevaporator+ω2ΔP
Wherein, Pset--- best condensing pressure set point；
Pevaporator--- saturation pressure corresponding with evaporating temperature (Heating,Ventilating and Air Conditioning is 40 °F, adjustable)；
ω --- pass through the refrigerant relative discharge of condenser；
Δ P --- expansion valve under design discharge, the sum of fluid suction line and the pressure loss of element.
Further, described directly or indirectly control expansion valve in maximum open position is by adjusting the condensation
The revolving speed of device blower or start and stop control the expansion valve in the position of standard-sized sheet.
Further, it realizes the best condensing pressure, further includes that a pressure is installed respectively before and after the expansion valve
Force snesor, or a temperature sensor is installed respectively before and after the expansion valve, or one is installed at the expansion valve
Differential pressure pickup, the controller control the expansion valve both ends by way of the revolving speed for controlling condenser fan or start and stop
Pressure difference or the temperature difference.
Further, realize the best condensing pressure, further include among the condenser or the condenser with
One pressure sensor or temperature sensor are installed, the controller controls the condenser on the pipeline between the expansion valve
The revolving speed of blower or start and stop control the pressure or temperature before the expansion valve.
Further, the DIGI-CFC module is ON/OFF blower to keep best cold to the control mode of constant speed blower
Solidifying pressure.Control mode to speed-changing draught fan is to adjust rotation speed of fan to keep best condensing pressure.
Further, the method is suitable for: Wind-cooling type, and the data center computer room of water-cooling type or glycol-cooled is accurate empty
Adjust unit, air source heat pump and separating air conditioner.
Further, the condenser fan of the unit is one or more or single-phase blower or three-phase wind
Machine.
Further, the unit includes one or two refrigerant circuit.
Compared with prior art, the beneficial effects of the present invention are: a kind of controller for condenser fan of the invention
The device and control method of DIGI-CFC and the best condensing pressure of realization are easy to accomplish.The DIGI-CFC module of controller directly or
Expansion valve, which is controlled, indirectly is preferably minimized the drag losses of expansion valve in maximum open position.Controller DIGI-CFC according to
Refrigerant flow calculates the best condensing pressure of unit operation at this time, then by control condenser fan to maintain most preferably to condense pressure
Power reduces compressor lift and energy consumption.
Detailed description of the invention
Fig. 1 is the functional-block diagram of the best condensing pressure of realization of first preferred embodiment of the invention.
Fig. 2 is the functional-block diagram of the best condensing pressure of realization of second preferred embodiment of the invention.
Fig. 3 is second of functional-block diagram of the best condensing pressure of realization of second preferred embodiment of the invention.
Fig. 4 is the third functional-block diagram of the best condensing pressure of realization of second preferred embodiment of the invention.
Fig. 5 is the functional-block diagram of the best condensing pressure of realization of third preferred embodiment of the invention.
Fig. 6 is another functional-block diagram of the best condensing pressure of realization of third preferred embodiment of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, in the embodiment of the present invention device and calculation method carry out it is clear
Chu is fully described by, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts all
Other embodiments shall fall within the protection scope of the present invention.
A kind of control method for realizing best condensing pressure, the controller DIGI-CFC is directly or indirectly by expansion valve
Control is preferably minimized the drag losses of the expansion valve in maximum open position.The controller DIGI-CFC is according to refrigerant
The best condensing pressure of flow rate calculation unit operation at this time, then realize that the best condensation is pressed by control condenser fan
Power.Below by way of specific embodiment enumerate the DIGI-CFC module of the controller there are three types of control method realize it is described best cold
Solidifying pressure.
Control method be based on evaporator 40, compressor 60, condenser 50, expansion valve 20, sequentially with copper pipe ring connection, and
The accumulation of heat of formation recycles, and it is best to calculate to control refrigerant flow by controller 10 for refrigerant loopy moving in accumulation of heat circulation
Condensing pressure.
As shown in Figure 1, being the first method for realizing best condensing pressure in third preferred embodiment of the invention.The party
Method is according to refrigerant flow and the optimal condensing pressure accounting equation (Pset=Pevaporator+ω2Δ P) calculate it is best cold
Solidifying pressure Pset, by the start and stop of the revolving speed or condensation fan of adjusting condenser fan, the position of standard-sized sheet is in the real expansion valve
It sets and (is known by valve position feedback signal), realize the best condensing pressure.
It as shown in figs 2-4, is the controlling party of the best condensing pressure of one of second preferred embodiment of the invention realization
Method.The method is according to refrigerant flow and the optimal condensing pressure accounting equation (Pset=Pevaporator+ω2Δ P) it calculates
Pressure differential deltap P between best condensing pressure and evaporating pressure installs a pressure respectively before and after the expansion valve 20 and passes
Sensor 80 installs a temperature sensor 70 respectively before and after expansion valve 20 or installs a pressure difference at expansion valve 20
The DIGI-CFC module of sensor 90, controller 10 controls the condensation according to the pressure difference or the temperature difference at 20 both ends of expansion valve
The revolving speed of device blower 30 or start and stop, it is consistent with the Δ P calculated come the pressure difference or the temperature difference that control 20 both ends of expansion valve, into
And realize the best condensing pressure control.
It as shown in Figure 5, Figure 6, is the controlling party of the best condensing pressure of one of third preferred embodiment of the invention realization
Method.This method is according to refrigerant flow and the optimal condensing pressure accounting equation (Pset=Pevaporator+ω2Δ P) it calculates
Best condensing pressure P outset, a temperature is installed on the pipeline among condenser 50 or between condenser 50 and expansion valve 20
Spend sensor 70 or pressure sensor 80, the DIGI-CFC module of controller 10 by control the condenser fan revolving speed or
Start and stop control the pressure before the expansion valve or temperature and the calculated value PsetIt is consistent, and then realize described best cold
Solidifying pressure.
The DIGI-CFC module of controller 10 is ON/OFF blower to keep most preferably condensing to the control mode of constant speed blower 30
Pressure is then to adjust rotation speed of fan to keep best condensing pressure to the control mode of speed-changing draught fan if blower is speed-changing draught fan.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (9)
1. a kind of control method for realizing best condensing pressure, it is characterised in that: the DIGI-CFC module of the controller is direct
Or indirectly controlling expansion valve is preferably minimized the drag losses of the expansion valve in maximum open position, the DIGI-CFC
Module calculates the best condensing pressure of unit operation at this time according to refrigerant flow, then by control condenser fan to realize
State best condensing pressure.
2. control method according to claim 1, which is characterized in that the DIGI-CFC module is according to refrigerant flow meter
The formula for calculating best condensing pressure is:
Pset=Pevaporator+ω2ΔP
Wherein, Pset--- best condensing pressure set point；
Pevaporator--- saturation pressure corresponding with evaporating temperature；
ω --- pass through the refrigerant relative discharge of condenser；
Δ P --- expansion valve under design discharge, the sum of fluid suction line and the pressure loss of element.
3. control method according to claim 1, which is characterized in that described directly or indirectly to control expansion valve most
Big open position is to control the expansion valve in the position of standard-sized sheet by the revolving speed or start and stop of the adjusting condenser fan.
4. control method according to claim 1, which is characterized in that realize the best condensing pressure, further include in institute
A pressure sensor is installed in the front and back for stating expansion valve respectively, or installs a temperature sensing respectively before and after the expansion valve
Device, or a differential pressure pickup is installed at the expansion valve, the controller is by controlling the revolving speed of condenser fan or opening
The mode stopped controls the pressure difference or the temperature difference at the expansion valve both ends.
5. control method according to claim 1, which is characterized in that realize the best condensing pressure, further include in institute
It states and a pressure sensor or temperature biography is installed on the pipeline among condenser or between the condenser and the expansion valve
Sensor, the controller control revolving speed or the start and stop of the condenser fan to control the pressure or temperature before the expansion valve.
6. control method according to claim 1, which is characterized in that control of the DIGI-CFC module to constant speed blower
Mode is ON/OFF blower to keep best condensing pressure.Control mode to speed-changing draught fan is to adjust rotation speed of fan to keep most
Good condensing pressure.
7. control method according to claim 1, which is characterized in that the method is suitable for: Wind-cooling type, water-cooling type, or
The data center computer room precision air conditioner unit of person's glycol-cooled, air source heat pump and separating air conditioner.
8. control method according to claim 1, which is characterized in that the condenser fan of the unit is one or more
Platform or single-phase blower or three-phase blower.
9. control method according to claim 1, which is characterized in that the unit includes that one or two refrigerant returns
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910193196.3A CN110030777B (en) | 2019-03-14 | 2019-03-14 | Control method for realizing optimal condensation pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910193196.3A CN110030777B (en) | 2019-03-14 | 2019-03-14 | Control method for realizing optimal condensation pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110030777A true CN110030777A (en) | 2019-07-19 |
| CN110030777B CN110030777B (en) | 2021-06-18 |
Family
ID=67236017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910193196.3A Active CN110030777B (en) | 2019-03-14 | 2019-03-14 | Control method for realizing optimal condensation pressure |
Country Status (1)
| Country | Link |
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| CN (1) | CN110030777B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750506A (en) * | 2020-07-06 | 2020-10-09 | 深圳市英维克科技股份有限公司 | Control system and control method of condensing fan |
| CN111775657A (en) * | 2020-07-13 | 2020-10-16 | 安徽江淮汽车集团股份有限公司 | Air conditioner condenser fan control circuit, device and car |
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| CN103575006A (en) * | 2013-11-25 | 2014-02-12 | 广东申菱空调设备有限公司 | Low-temperature refrigeration type air-cooling water chilling unit and control method thereof |
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| CN105737422A (en) * | 2016-03-20 | 2016-07-06 | 嵊州高翔冷链设备股份有限公司 | Household refrigerator refrigerating system with inverter compressor |
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| CN206709316U (en) * | 2017-04-13 | 2017-12-05 | 铨高科技（珠海）股份有限公司 | A kind of condenser fan speed-adjusting and control system |
| CN207179887U (en) * | 2017-09-04 | 2018-04-03 | 三河同飞制冷股份有限公司 | A kind of industrial refrigeration unit using EC blower fans |
| CN208011962U (en) * | 2018-02-12 | 2018-10-26 | 深圳市亿凌捷科技有限公司 | All weather refrigeration system |
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2019
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|---|---|---|---|---|
| CN101082461A (en) * | 2006-05-31 | 2007-12-05 | 中山工程株式会社 | Refrigerated storage or refrigeration equipment and control method thereof |
| CN201335581Y (en) * | 2009-01-05 | 2009-10-28 | 江苏新誉空调系统有限公司 | High-speed track train air conditioner refrigerating system with condensing pressure regulating function |
| CN201526483U (en) * | 2009-10-22 | 2010-07-14 | 同济大学 | Variable speed control system for condensate fan |
| CN103575006A (en) * | 2013-11-25 | 2014-02-12 | 广东申菱空调设备有限公司 | Low-temperature refrigeration type air-cooling water chilling unit and control method thereof |
| CN204757491U (en) * | 2015-06-10 | 2015-11-11 | 南京天加空调设备有限公司 | Adjustable condensing pressure's low form air -cooled unit |
| CN105737422A (en) * | 2016-03-20 | 2016-07-06 | 嵊州高翔冷链设备股份有限公司 | Household refrigerator refrigerating system with inverter compressor |
| CN206488366U (en) * | 2016-12-30 | 2017-09-12 | 东莞市高雅空调制冷有限公司 | The air-conditioner set of condensing pressure is controlled with pressure controller |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750506A (en) * | 2020-07-06 | 2020-10-09 | 深圳市英维克科技股份有限公司 | Control system and control method of condensing fan |
| CN111775657A (en) * | 2020-07-13 | 2020-10-16 | 安徽江淮汽车集团股份有限公司 | Air conditioner condenser fan control circuit, device and car |
| CN111775657B (en) * | 2020-07-13 | 2021-09-28 | 安徽江淮汽车集团股份有限公司 | Air conditioner condenser fan control circuit, device and car |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110030777B (en) | 2021-06-18 |
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Effective date of registration: 20210219 Address after: 6th floor, No.16, 12 Gaoqi South Road, Xiamen area, China (Fujian) pilot Free Trade Zone, Xiamen City, Fujian Province Applicant after: Fujian baishide Energy Technology Co.,Ltd. Address before: Omaha City, Nebraska Applicant before: Liu Mingsheng |
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