CN108006919A - A kind of evaporation cooling type cold water unit, its control method and control system - Google Patents
A kind of evaporation cooling type cold water unit, its control method and control system Download PDFInfo
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- CN108006919A CN108006919A CN201711129492.4A CN201711129492A CN108006919A CN 108006919 A CN108006919 A CN 108006919A CN 201711129492 A CN201711129492 A CN 201711129492A CN 108006919 A CN108006919 A CN 108006919A
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- frequency
- wet
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- air inlet
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a kind of evaporation cooling type cold water unit, its control method and control system.The control method includes：Detect the wet-bulb temperature and Compressor Discharge Pressure of condenser air inlet/outlet, and scope and the frequency of the wet-bulb depression value of condenser air inlet/outlet control frequency conversion fan and variable frequency pump according to residing for pressure at expulsion.Present invention can ensure that efficiency is optimal when machine set compressor is run in normal operation range; the waste of water resource is reduced, by controlling water and air quantity to supply, reduces heat exchanger surface dry spot phenomenon; reduce high voltage protective and produce fluctuation of service state, improve the reliability after unit operation.
Description
Technical field
The present invention relates to air-conditioning equipment field, more particularly to a kind of evaporation cooling type cold water unit, its control method and control
System processed.
Background technology
China greatly develops track traffic in recent years, and subway station air conditioner equipment gradually attracts much attention, by
In the problems such as difficult there are cooling tower addressing, subway station energy consumption is higher, Metro Air conditioner needs high reliability, less trouble and energy saving
Type product, evaporating type condensing unit can just solve the problems, such as these.
But existing evaporating type condensing unit does not control water and air quantity effectively, so as to cause water resource
Excess waste, larger water supply and air quantity can also produce huge noise, and excessive or too small water-gas ratio influences unit
The problems such as energy consumption, these problems hinder the popularization and application of vaporation-type cooling technology and its unit.
It is therefore proposed that a kind of brand-new wind turbine and water pump control program are technical problems urgently to be resolved hurrily in the industry.
The content of the invention
The purpose of the present invention is in view of the above-mentioned drawbacks of the prior art, provide a kind of evaporation cooling type cold water unit,
Its control method and control system.
The technical solution adopted by the present invention is to propose a kind of control method of evaporation cooling type cold water unit, the control
Method processed includes：Detect the wet-bulb temperature and Compressor Discharge Pressure of condenser air inlet/outlet, and the scope according to residing for pressure at expulsion
The frequency of frequency conversion fan and variable frequency pump is controlled with the wet-bulb depression value of condenser air inlet/outlet.
In one embodiment, the control method comprises the following steps：
Whether step 1. detects Compressor Discharge Pressure P and judges pressure at expulsion in normal operation range;
Step 2. is when pressure at expulsion is less than or equal to the critical value of minimum high-pressure（P≤A）, judge the wet-bulb depression of air inlet/outlet
Whether value is less than inlet and outlet highest wet-bulb depression critical value（Δ t ＜ D）, if so, 3 are then gone to step, if not, going to step 4；
Step 3. reduces the frequency of frequency conversion fan, reduces air quantity, continues to detect Compressor Discharge Pressure afterwards；
Step 4. reduces the frequency of variable frequency pump, reduces water, continues to detect Compressor Discharge Pressure afterwards；
Step 5. is when pressure at expulsion is between the critical value of minimum high-pressure and the critical value of highest high-pressure（A ＜ P ＜
B）, judge whether the wet-bulb depression value of air inlet/outlet is less than or equal to minimum inlet and outlet wet-bulb depression critical value（Δt≤C）, such as
It is then to go to step 6, if not, going to step 7；
Step 6. increases the frequency of variable frequency pump, increases water, continues to detect Compressor Discharge Pressure afterwards；
Step 7. judges whether the wet-bulb depression value of air inlet/outlet is less than highest inlet and outlet wet-bulb depression critical value（Δ t ＜ D）, such as
It is then to go to step 8, if not, going to step 4；
The frequency of step 8. frequency conversion fan and variable frequency pump is constant, stable operation, and continues to detect Compressor Discharge Pressure；
Step 9. is when pressure at expulsion is greater than or equal to the critical value of highest high-pressure（P≥B）, judge the wet bulb temperature of air inlet/outlet
Whether difference is less than or equal to minimum inlet and outlet wet-bulb depression critical value（Δt≤C）, if so, 6 are then gone to step, if not, turning step
Rapid 10；
Step 10. judges whether the wet-bulb depression value of air inlet/outlet is less than highest inlet and outlet wet-bulb depression critical value（Δ t ＜ D）,
If so, 11 are then gone to step, if not, going to step 12；
Step 11. increases the frequency of frequency conversion fan and variable frequency pump at the same time, continues to detect Compressor Discharge Pressure afterwards；
Step 12. increases the frequency of frequency conversion fan, continues to detect Compressor Discharge Pressure afterwards.
The present invention also proposes a kind of control system of evaporation cooling type cold water unit, including：
Humidity collection module, for gathering the wet-bulb temperature of condenser air inlet/outlet；
Pressure acquisition module, for gathering the pressure at expulsion of compressor；
First comparison module, for judge pressure at expulsion whether setting range of operation；
Second comparison module, for judge condenser air inlet/outlet wet-bulb depression whether setting range of operation；
Execution module, for controlling the frequency of frequency conversion fan and variable frequency pump according to the judging result of the first module and the second module
Rate.
The execution module works according to the following steps：
As P≤A and Δ t ＜ D, the frequency of frequency conversion fan is reduced, reduces air quantity；As P≤A and Δ t >=D, frequency conversion water is reduced
The frequency of pump；
As A ＜ P ＜ B and Δ t≤C, increase the frequency of variable frequency pump, increase water；As A ＜ P ＜ B and Δ t ＞ C, judge
Δ t ＜ D, if so, then keep the frequency of variable frequency pump and frequency conversion fan constant, stable operation, if not, reducing variable frequency pump
Frequency；
As P >=B and Δ t≤C, increase the frequency of variable frequency pump；During such as P >=B and Δ t ＞ C, Δ t ＜ D are judged, if so, at the same time
Increase the frequency of frequency conversion fan and variable frequency pump；If not, the frequency of increase frequency conversion fan.
The present invention also proposes a kind of evaporation cooling type cold water unit, including compressor, condenser and control system, wherein,
The condenser uses tower water-cooling system, including frequency conversion fan and variable frequency pump, and the inlet and outlet of the condenser is equipped with wet
Ball temperature sensor, the compressor exhaust pipe are equipped with pressure sensor, and the control system is according to Compressor Discharge Pressure institute
Locate scope and the wet-bulb depression value control frequency conversion fan of condenser air inlet/outlet and the frequency of variable frequency pump.
Compared with prior art, the present invention supplies suitable air quantity and water using frequency conversion fan and variable frequency pump to condenser
Amount, reaches optimal water-gas ratio, efficiency is optimal；In the case where ensureing unit normal operation, the waste problem of water resource is reduced, is subtracted
The noise that small unit produces, ensures the comfort level of user, projected life is improved, in addition, this invention also solves region versatility
The problem of poor, can meet unit normal operation under high load capacity heat exchange amount, and avoid wind turbine and water pump long-time high load from running,
The service life of device is improved, promotes the application of evaporating type condensing unit.
Brief description of the drawings
Fig. 1 is the schematic diagram of evaporation cooling type cold water unit；
Fig. 2 is the schematic diagram of control system of the present invention；
Fig. 3 is the flow chart of the method for the present invention.
Embodiment
Invention is described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, evaporation cooling type cold water unit includes compressor 1, condenser 2, throttle valve 3 and shell and tube evaporator
4.Condenser uses tower water-cooling system, including frequency conversion fan 5, variable frequency pump 6 and water tank 10.The air inlet of condenser is equipped with wet
Ball temperature sensor 7, air outlet are equipped with wet bulb temperature sensor 8, and compressor exhaust pipe is equipped with pressure sensor 9.
As shown in Fig. 2, the control system of evaporation cooling type cold water unit proposed by the present invention includes：
Humidity collection module, for gathering the wet-bulb temperature of condenser air inlet/outlet；
Pressure acquisition module, for gathering the pressure at expulsion of compressor；
First comparison module, for judge pressure at expulsion whether setting range of operation；
Second comparison module, for judge condenser air inlet/outlet wet-bulb depression whether setting range of operation；
Execution module, for controlling the defeated of frequency conversion fan and variable frequency pump according to the judging result of the first module and the second module
Go out.
The present invention in evaporative condenser air inlet and air outlet is respectively arranged a Temperature Humidity Sensor, for detect into
Wind wet-bulb temperature t1 and outlet air wet-bulb temperature t2, and using pressure sensor detection compressor high side pressure P, ensureing high pressure
Under conditions of pressure is in normal operation range, frequency conversion fan and variable frequency pump provide the suitable air quantity of condenser and water.
Control method proposed by the present invention is to start to detect compressor exhaust pipe lateral pressure P and condensation after unit starts shooting Ts
Device air inlet/outlet wet-bulb depression Δ t（Δt= t2- t1）, and by judging that the scope of pressure and the temperature difference adjusts frequency conversion fan and frequency conversion
The running frequency of water pump, changes water-gas ratio in condenser, so as to influence high-pressure, enables unit even running.
Operationally high pressure needs to run in OK range etc vaporation-type cooling machine set compressor, air inlet wet-bulb temperature
T1 is ambient wet bulb temperature, and when condenser aqueous vapor is lower, air outlet relative humidity also can be accordingly relatively low, and air outlet is wet at this time
Ball temperature t2 also can be relatively low, i.e. Δ t is smaller.
In the case where environmental condition determines, t1 is definite value, when Δ t increases, the water increase of evaporation, and condensation temperature phase
It should reduce, high-pressure also decreases.Unit operation high-pressure and inlet and outlet wet-bulb temperature have most under varying environment
Suitable scope：A <P <B；C <Δt<D.
Wherein：A-minimum high-pressure critical value；
B-highest high-pressure critical value；
C-minimum inlet and outlet wet-bulb temperature difference critical value；
D-highest inlet and outlet wet-bulb temperature difference critical value.
The present invention adjusts air quantity and water to make unit normal operation according to above-mentioned decision logic.
Control method proposed by the present invention specifically includes following steps：
Step 1. unit detects Compressor Discharge Pressure P after opening Ts and judges the scope residing for pressure at expulsion;
Step 2. is when pressure at expulsion is less than or equal to the critical value of minimum high-pressure（P≤A）, judge the wet-bulb depression of air inlet/outlet
Whether value is less than highest inlet and outlet wet-bulb depression critical value（Δ t ＜ D）, if so, 3 are then gone to step, if not, going to step 4；
Step 3. reduces the frequency of frequency conversion fan, reduces air quantity, ensures that unit normal operation saves fan energy consumption at the same time, reduces wind
Machine noise, continues to detect Compressor Discharge Pressure afterwards；
Step 4. reduces the frequency of variable frequency pump, reduces water, ensures that unit normal operation reduces pump consumption at the same time, reduces water
The waste of resource, continues to detect Compressor Discharge Pressure afterwards,
Step 5. is when pressure at expulsion is between the critical value of minimum high-pressure and the critical value of highest high-pressure（A ＜ P ＜
B）, judge whether the wet-bulb depression value of air inlet/outlet is less than or equal to minimum inlet and outlet wet-bulb depression critical value（Δt≤C）, such as
It is then to go to step 6, if not, going to step 7；
Step 6. increases the frequency of variable frequency pump, increases water, ensures normal water needed for unit, increases condenser heat exchange amount,
Overall performance is lifted, continues to detect Compressor Discharge Pressure afterwards；
Step 7. judges whether the wet-bulb depression value of air inlet/outlet is less than highest inlet and outlet wet-bulb depression critical value（Δ t ＜ D）, such as
It is then to go to step 8, if not, going to step 4, reduces variable frequency pump frequency at this time, reduce water supply, ensures that unit is normally transported
Row reduces pump consumption at the same time；
Step 8. stable operation, at this time condenser water and air quantity supply continue to detect compressor row afterwards all in proper states
Atmospheric pressure；
Step 9. is when pressure at expulsion is greater than or equal to the critical value of highest high-pressure（P≥B）, judge the wet bulb temperature of air inlet/outlet
Whether difference is less than or equal to minimum inlet and outlet wet-bulb depression critical value（Δt≤C）, if so, 6 are then gone to step, if not, turning step
Rapid 10；
Step 10. judges whether the wet-bulb depression value of air inlet/outlet is less than highest inlet and outlet wet-bulb depression critical value（Δ t ＜ D）,
If so, 11 are then gone to step, if not, going to step 12；
Step 11. increases the frequency of frequency conversion fan and variable frequency pump at the same time, continues to detect Compressor Discharge Pressure afterwards；
Step 12. increases the frequency of frequency conversion fan, continues to detect Compressor Discharge Pressure afterwards.
Pass through above-mentioned control process, it is ensured that efficiency is optimal when machine set compressor is run in normal operation range, subtracts
The waste of few water resource, by controlling water and air quantity to supply, reduces heat exchanger surface dry spot phenomenon, reduces high voltage protective and produce
Fluctuation of service state, improves the reliability after unit operation, improves user experience.
Above-described embodiment is merely to illustrate the embodiment of the present invention.It should be pointed out that for the general of this area
For logical technical staff, without departing from the inventive concept of the premise, some deformations and change can also be made, these deformations and
Change should all belong to protection scope of the present invention.
Claims (5)
1. a kind of control method of evaporation cooling type cold water unit, it is characterised in that the control method includes：Detection condensation
The wet-bulb temperature and Compressor Discharge Pressure of device air inlet/outlet, and the wet bulb of scope and condenser air inlet/outlet according to residing for pressure at expulsion
Temperature difference controls the frequency of frequency conversion fan and variable frequency pump.
2. control method as claimed in claim 1, it is characterised in that comprise the following steps：
Whether step 1. detects Compressor Discharge Pressure P and judges pressure at expulsion in normal operation range;
Step 2. is when pressure at expulsion is less than or equal to the critical value of minimum high-pressure（P≤A）, judge the wet-bulb depression of air inlet/outlet
Whether value is less than inlet and outlet highest wet-bulb depression critical value（Δ t ＜ D）, if so, 3 are then gone to step, if not, going to step 4；
Step 3. reduces the frequency of frequency conversion fan, reduces air quantity, continues to detect Compressor Discharge Pressure afterwards；
Step 4. reduces the frequency of variable frequency pump, reduces water, continues to detect Compressor Discharge Pressure afterwards；
Step 5. is when pressure at expulsion is between the critical value of minimum high-pressure and the critical value of highest high-pressure（A ＜ P ＜
B）, judge whether the wet-bulb depression value of air inlet/outlet is less than or equal to minimum inlet and outlet wet-bulb depression critical value（Δt≤C）, such as
It is then to go to step 6, if not, going to step 7；
Step 6. increases the frequency of variable frequency pump, increases water, continues to detect Compressor Discharge Pressure afterwards；
Step 7. judges whether the wet-bulb depression value of air inlet/outlet is less than highest inlet and outlet wet-bulb depression critical value（Δ t ＜ D）, such as
It is then to go to step 8, if not, going to step 4；
The frequency of step 8. frequency conversion fan and variable frequency pump is constant, stable operation, and continues to detect Compressor Discharge Pressure；
Step 9. is when pressure at expulsion is greater than or equal to the critical value of highest high-pressure（P≥B）, judge the wet bulb temperature of air inlet/outlet
Whether difference is less than or equal to minimum inlet and outlet wet-bulb depression critical value（Δt≤C）, if so, 6 are then gone to step, if not, turning step
Rapid 10；
Step 10. judges whether the wet-bulb depression value of air inlet/outlet is less than highest inlet and outlet wet-bulb depression critical value（Δ t ＜ D）,
If so, 11 are then gone to step, if not, going to step 12；
Step 11. increases the frequency of frequency conversion fan and variable frequency pump at the same time, continues to detect Compressor Discharge Pressure afterwards；
Step 12. increases the frequency of frequency conversion fan, continues to detect Compressor Discharge Pressure afterwards.
A kind of 3. control system of evaporation cooling type cold water unit, it is characterised in that including：
Humidity collection module, for gathering the wet-bulb temperature of condenser air inlet/outlet；
Pressure acquisition module, for gathering the pressure at expulsion of compressor；
First comparison module, for judge pressure at expulsion whether setting range of operation；
Second comparison module, for judge condenser air inlet/outlet wet-bulb depression whether setting range of operation；
Execution module, for controlling the frequency of frequency conversion fan and variable frequency pump according to the judging result of the first module and the second module
Rate.
4. control system as claimed in claim 3, it is characterised in that
As P≤A and Δ t ＜ D, the frequency of frequency conversion fan is reduced, reduces air quantity；As P≤A and Δ t >=D, frequency conversion water is reduced
The frequency of pump；
As A ＜ P ＜ B and Δ t≤C, increase the frequency of variable frequency pump, increase water；As A ＜ P ＜ B and Δ t ＞ C, judge
Δ t ＜ D, if so, then keep the frequency of variable frequency pump and frequency conversion fan constant, stable operation, if not, reducing variable frequency pump
Frequency；
As P >=B and Δ t≤C, increase the frequency of variable frequency pump；During such as P >=B and Δ t ＞ C, Δ t ＜ D are judged, if so, at the same time
Increase the frequency of frequency conversion fan and variable frequency pump；If not, the frequency of increase frequency conversion fan.
5. a kind of evaporation cooling type cold water unit, including compressor, condenser and control system, it is characterised in that the condensation
Device uses tower water-cooling system, including frequency conversion fan and variable frequency pump, and the inlet and outlet of the condenser is passed equipped with wet-bulb temperature
Sensor, the compressor exhaust pipe are equipped with pressure sensor, the control system according to residing for Compressor Discharge Pressure scope and
The wet-bulb depression value control frequency conversion fan of condenser air inlet/outlet and the frequency of variable frequency pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711129492.4A CN108006919B (en) | 2017-11-15 | 2017-11-15 | Evaporative cooling type water chilling unit, and control method and control system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711129492.4A CN108006919B (en) | 2017-11-15 | 2017-11-15 | Evaporative cooling type water chilling unit, and control method and control system thereof |
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|---|---|
| CN108006919A true CN108006919A (en) | 2018-05-08 |
| CN108006919B CN108006919B (en) | 2020-02-11 |
Family
ID=62052804
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Cited By (3)
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| CN109792959A (en) * | 2019-03-15 | 2019-05-24 | 四川省畜牧科学研究院 | A kind of novel energy-conserving ring control greenhouse rabbit home |
| CN112393345A (en) * | 2020-11-30 | 2021-02-23 | 珠海格力电器股份有限公司 | Water pump frequency control method and device, evaporative cooler and air conditioning system |
| CN114279049A (en) * | 2021-12-22 | 2022-04-05 | 珠海格力电器股份有限公司 | Refrigerating unit and control method for automatically optimizing frequency of variable frequency fan of refrigerating unit |
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| CN114279049A (en) * | 2021-12-22 | 2022-04-05 | 珠海格力电器股份有限公司 | Refrigerating unit and control method for automatically optimizing frequency of variable frequency fan of refrigerating unit |
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| Publication number | Publication date |
|---|---|
| CN108006919B (en) | 2020-02-11 |
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