CN113669966A - Method for controlling operation of heat pump unit through water temperature - Google Patents
Method for controlling operation of heat pump unit through water temperature Download PDFInfo
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- CN113669966A CN113669966A CN202110826555.1A CN202110826555A CN113669966A CN 113669966 A CN113669966 A CN 113669966A CN 202110826555 A CN202110826555 A CN 202110826555A CN 113669966 A CN113669966 A CN 113669966A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000001276 controlling effect Effects 0.000 claims abstract description 55
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 230000000630 rising effect Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 claims description 2
- 239000004576 sand Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000002441 reversible effect Effects 0.000 description 1
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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
- F25B49/022—Compressor control arrangements
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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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
- F24F5/001—Compression cycle type
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
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- 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 relates to the field of air source heat pump units, in particular to a method for controlling the operation of a heat pump unit through water temperature, which is used for obtaining the initial return water temperature T when the heat pump unit is restarted1And the return water temperature T when the unit capacity is stable2And the return water temperature T obtained by taking the time interval T as a period3、T4、T5、…、Tn(ii) a Controlling the compressor to increase, stabilize and decrease the frequency according to the difference delta T of the return water temperatures of the adjacent detection periods or regulating the compressor frequency to correct the difference of the return water temperatures of the adjacent detection periods until the return water temperature reaches the target water temperature of the unit, controlling the unit to stop and recording the compressor frequency f before the unit stops; actual water temperature T of unitRAnd the preset target water temperature TsThe difference value of (A) reaches the preset start-stop temperature difference delta TsThe unit is started again at the initial frequency f' and the above steps are repeated. The invention provides a method for controlling the operation of a heat pump unit through water temperature so as to prolong the single operation time of the unit, improve the energy efficiency of the unit and reduce the noise of the unit.
Description
Technical Field
The invention relates to the field of air source heat pump units, in particular to a method for controlling the operation of a heat pump unit through water temperature.
Background
At present, an air source heat pump (cold water) unit is mainly provided with a variable frequency compressor on the market, all manufacturers provide a full direct current unit with a combination of a direct current fan and the variable frequency compressor, the direct current fan and the variable frequency compressor can adjust the rotating speed, in the aspect of controlling the frequency of the compressor, segmentation treatment is carried out according to the ambient temperature or the water temperature, and the highest operating frequency of the compressor is specified in each ambient temperature or water temperature interval. In the actual operation of the unit, before the water temperature of the unit does not reach the set water temperature, the frequency of the compressor is increased until the maximum frequency of the environment temperature interval is reached, and then the unit is stopped after the unit works at the maximum frequency until the water temperature reaches the set water temperature. Along with the dissipation of the heat at the tail end, the water temperature gradually drops, and after the water temperature reaches a certain value, the starting condition is met. The unit is started, the compressor reaches the maximum operation frequency after operating for a period of time, and the unit is stopped after the set water temperature is reached. The unit is cyclically operated in the control mode.
Set water temperature TSActual water temperature T after shutdownRFrom TSChange when the change value reaches Δ TsAnd when the unit is restarted. Delta TsReferred to as start-stop temperature difference, if Δ TsThe size is small, and the unit can be frequently started and stopped to work; if Δ TsThe temperature change value of the tail end (wind disc/floor heating/radiator and the like) is large, so that the temperature change of the use environment of an end user is large, the experience is poor, and complaints are caused. Therefore, only canWill delta TsSet to a reasonable value (typically not exceeding 5 ℃).
The reason is that the capacity of the unit in actual operation is far greater than the actual requirement of an end user, and the temperature difference delta T is quickly reached by the change of the water temperaturesTherefore, the start-stop phenomenon frequently occurs.
Disclosure of Invention
The invention aims to provide a method for controlling the operation of a heat pump unit through water temperature so as to prolong the single operation time of the unit, improve the energy efficiency of the unit and reduce the noise of the unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for controlling the operation of a heat pump unit through water temperature is characterized by comprising the following steps:
obtaining the initial return water temperature T when the heat pump unit is started again1And the return water temperature T when the unit capacity is stable2And the return water temperature T obtained by taking the time interval T as a period3、T4、T5、…、Tn(ii) a Controlling the compressor to increase, stabilize and decrease the frequency according to the difference delta T of the return water temperatures of the adjacent detection periods or regulating the compressor frequency to correct the difference of the return water temperatures of the adjacent detection periods until the return water temperature reaches the target water temperature of the unit, controlling the unit to stop and recording the compressor frequency f before the unit stops; actual water temperature T of unitRAnd the preset target water temperature TsThe difference value of (A) reaches the preset start-stop temperature difference delta TsThe unit is restarted at an initial frequency f 'and the above steps are repeated, wherein f' is ≧ f.
Further, the specific steps of controlling the frequency increasing, the frequency stabilizing and the frequency reducing of the compressor according to the difference value delta T of the return water temperatures of the adjacent detection periods are as follows: if the condition delta T is less than 0.2 ℃, the compressor is positioned in the frequency increasing region, and the frequency of the compressor is controlled to be increased at the speed of 1Hz/5 min; if the condition that delta T is more than or equal to 0.2 ℃ and less than or equal to 0.5 ℃ is met, the frequency of the compressor is kept constant when the compressor is positioned in a frequency stabilizing area; if the condition delta T is more than 0.5 ℃ and the compressor is positioned in the frequency reduction region, controlling the compressor to reduce the frequency at the speed of 1Hz/4 min.
Further, when the compressor is located in the frequency raising region, the method also comprises the following control steps: if the condition delta T is less than-0.5 ℃ and the compressor is positioned in the frequency increasing region, controlling the compressor to increase the frequency at the speed of 1Hz/2 min; if the condition that delta T is more than or equal to minus 0.5 ℃ and less than 0 ℃ is met, the compressor is positioned in the frequency increasing region, and the frequency of the compressor is increased at the speed of 1Hz/3 min.
Further, the specific steps of regulating and controlling the compressor frequency and correcting the difference value of the return water temperatures of the adjacent detection periods are as follows: calculating the formula: Δ T' = Δ Ts/（TQ60/T), wherein TQRestarting the running time of the preset unit with the unit as follows: h; delta T' is a time correction water temperature difference value; and adjusting the frequency of the compressor until the difference value of the return water temperatures of the adjacent detection periods reaches delta T' to maintain the frequency of the compressor constant.
Further, the specific steps of regulating and controlling the compressor frequency and correcting the difference value of the return water temperatures of the adjacent detection periods are as follows: calculating the formula: Δ T "= Δ Ts/（TwT/60T), wherein TwRestarting the water temperature rising speed for a preset unit, wherein the unit is as follows: h; Δ T "is the speed corrected water temperature difference; and adjusting the frequency of the compressor until the difference of the return water temperatures of the adjacent detection periods reaches delta T' and maintaining the frequency of the compressor constant.
Further, the method also comprises the following steps: if the condition delta T is less than 0.2 ℃, controlling the fan to increase the rotating speed; if the condition that delta T is more than or equal to 0.2 ℃ and less than or equal to 0.5 ℃ is met, controlling the fan to maintain the rotating speed; if the condition delta T is more than 0.5 ℃, controlling the fan to regulate and reduce the rotating speed.
Further, the method also comprises the following steps: when the heat pump unit is started again, according to the obtained environmental temperature TaAnd adjusting the rotating speed of the fan.
Further, the specific steps of adjusting the rotating speed of the fan according to the acquired environment temperature are as follows: when the heat pump unit is in a refrigeration mode, if the condition T is meta≥Ta1Controlling the fan to run at the highest rotating speed; if the condition T is satisfieda2≤Ta＜Ta1Then according to the formula TN ═ T (T)a－Ta2）/ （Ta1－Ta2）×（TNmax－TNmin）＋TNminAdjusting the rotating speed of the fan; wherein, Ta1And Ta2Is an ambient temperature threshold; TN is the rotating speed of the fan; TN (twisted nematic)maxAnd TNminIs a threshold value of the rotating speed of the fan; if the condition T is satisfieda＜Ta2And controlling the fan to operate at the lowest rotating speed.
Further, the specific steps of adjusting the rotating speed of the fan according to the acquired environment temperature are as follows: when the heat pump set is in a heating mode, if the condition T is meta≥Ta3Controlling the fan to run at the highest rotating speed; if the condition T is satisfieda4≤Ta＜Ta3Then according to the formula TN ═ T (T)a－Ta3）/ （Ta4－Ta3）×（TNmax－TNmin）＋TNminAdjusting the rotating speed of the fan; wherein, Ta3And Ta4Is an ambient temperature threshold; TN is the rotating speed of the fan; TN (twisted nematic)maxAnd TNminIs a threshold value of the rotating speed of the fan; if the condition T is satisfieda＜Ta4And controlling the fan to operate at the lowest rotating speed.
The invention adopts the technical scheme and has the following beneficial effects: the unit water temperature change speed is controlled in a proper interval by controlling the frequency of the compressor and the rotating speed of the fan, so that the starting and stopping times of the compressor are reduced, the single operation time of the unit is prolonged, the unit energy efficiency is improved, and the unit noise is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a frequency control diagram of a compressor according to an embodiment of the present invention.
Detailed Description
In order to make the technical features, objects and effects of the present invention more clearly understood, a detailed description of embodiments of the present invention will be given below with reference to the accompanying drawings.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The application provides a method for controlling the operation of a heat pump unit through water temperature, the heat pump unit is provided with a variable frequency compressor and a direct current fan with adjustable rotating speed, and the method is described in detail as follows:
in the process of first starting up and water heating of the heat pump unit, the frequency of the compressor is controlled to stably rise to the frequency threshold value F of the compressormaxThen keeping the temperature constant, and judging the actual water temperature T detected by the conditionREqual to the preset target water temperature TsAnd if so, stopping the unit.
After the unit stops running, along with the continuous circulation of water flow in the pipeline and the tail end heat exchanger, the actual water temperature TRConstantly changing (decreasing in heating mode and increasing in cooling mode) when TRAnd TSThe difference value of (A) reaches the control specified delta TsAnd then the unit is restarted to enter the following secondary starting control steps.
Step 10, obtaining the initial return water temperature T before restarting the compressor1And the return water temperature T when the unit capacity is stable2And the return water temperature T obtained by taking the time interval T as a period3、T4、T5、…、Tn。
And step 20, controlling the frequency rising, frequency stabilization and frequency reduction of the compressor according to the difference value delta T of the return water temperatures of the adjacent detection periods.
The specific steps of controlling the frequency increasing, the frequency stabilizing and the frequency reducing of the compressor according to the difference value delta T of the return water temperatures of the adjacent detection periods are as follows:
step 21, if the condition delta T is less than 0.2 ℃ and the compressor is located in the frequency increasing region, controlling the compressor to increase the frequency at the speed of 1Hz/5 min;
step 22, if the condition that delta T is more than or equal to 0.2 ℃ and less than or equal to 0.5 ℃ is met, maintaining the frequency of the compressor to be constant when the compressor is positioned in a frequency stabilizing area;
and 23, if the condition delta T is more than 0.5 ℃ and the compressor is positioned in the frequency reduction area, controlling the compressor to reduce the frequency at the speed of 1Hz/4 min.
Please refer to fig. 1, which is a specific compressor frequency control diagram, dividing the compressor frequency control into an up-conversion region, a frequency stabilization region and a down-conversion region according to a difference Δ T between return water temperatures of adjacent detection periods, wherein the up-conversion region and the down-conversion region may be further subdivided into regions, for example, the regions may include:
step 24, if the condition delta T is less than-0.5 ℃ and the compressor is positioned in the frequency increasing region, controlling the compressor to increase the frequency at the speed of 1Hz/2 min; and
and 25, if the condition that delta T is more than or equal to 0.5 ℃ and less than 0 ℃ is met, controlling the compressor to perform frequency rising at the speed of 1Hz/3min if the compressor is positioned in a frequency rising region.
The frequency modulation step to the compressor more than adopting of this application, with unit temperature variation speed control in a suitable interval to reduce opening of compressor and stop the number of times, it is long when extension unit single operation, improve the unit efficiency and reduce the unit noise.
In order to meet the humanized use requirement of the heat pump unit, the heat pump unit is provided with a restarting operation time T for setting different units by a userQAnd the unit restarts the water temperature rising speed TwIn order to reduce the burden of the user, the control panel of the heat pump unit may be provided with relevant parameters as default data before the heat pump unit leaves the factory, and the user may modify the data according to their preferences or directly adopt the default data of the heat pump unit.
In other embodiments, the present application corrects the difference between return water temperatures for adjacent detection periods based on compressor frequency regulation.
The method specifically comprises the following steps:
step 31, calculating a formula: Δ T' = Δ Ts/（TQ60/T), wherein TQRestarting the running time of the preset unit with the unit as follows: h; delta T' is time correction waterA temperature difference value;
and step 32, adjusting the frequency of the compressor until the difference value of the return water temperatures of the adjacent detection periods reaches delta T', and keeping the frequency of the compressor constant.
In some further embodiments, the method specifically comprises:
step 41, calculating a formula: Δ T "= Δ Ts/（TwT/60T), wherein TwRestarting the water temperature rising speed for a preset unit, wherein the unit is as follows: h; Δ T "is the speed corrected water temperature difference;
and 42, adjusting the frequency of the compressor until the difference value of the return water temperatures of the adjacent detection periods reaches delta T' and keeping the frequency of the compressor constant.
The present application presets a parameter TQAnd TwThe difference value of the return water temperatures of adjacent detection periods is corrected in a reverse mode by regulating the frequency of the compressor, so that the water temperature can be reasonably and controllably raised to a preset target water temperature, the conception is ingenious, the control is convenient, and the energy efficiency ratio is improved.
And step 50, repeating the steps 20 to 23 or repeating the steps 20 to 25 or repeating the steps 31 to 32 or repeating the steps 41 to 42 until the return water temperature reaches the target water temperature of the unit, controlling the unit to stop and recording the frequency f of the compressor before the unit stops.
Step 60, setting the actual water temperature T of the unitRAnd the preset target water temperature TsThe difference value of (A) reaches the preset start-stop temperature difference delta TsThe unit is restarted at an initial frequency f 'and the above steps are repeated, wherein f' is ≧ f.
The method also comprises the specific steps of adjusting the rotating speed of the fan according to the difference value delta T of the return water temperatures of adjacent detection periods:
step 71, if the condition delta T is less than 0.2 ℃, controlling the fan to increase the rotating speed;
step 72, if the condition that delta T is more than or equal to 0.2 ℃ and less than or equal to 0.5 ℃ is met, controlling the fan to maintain the rotating speed;
and 73, if the condition delta T is more than 0.5 ℃, controlling the fan to regulate and reduce the rotating speed.
In the embodiment, the water temperature change speed of the unit is controlled in a proper interval by controlling the rotating speed of the fan, so that the starting and stopping times of the compressor are reduced, the single-time running time of the unit is prolonged, the energy efficiency of the unit is improved, and the noise of the unit is reduced.
In some preferred embodiments, the ambient temperature T is determined when the heat pump unit is started againaAnd adjusting the rotating speed of the fan.
When the heat pump unit is in a refrigeration mode, if the condition T is meta≥Ta1Controlling the fan to run at the highest rotating speed; if the condition T is satisfieda2≤Ta＜Ta1Then according to the formula TN ═ T (T)a－Ta2）/ （Ta1－Ta2）×（TNmax－TNmin）＋TNminAdjusting the rotating speed of the fan; wherein, Ta1And Ta2Is an ambient temperature threshold; TN is the rotating speed of the fan; TN (twisted nematic)maxAnd TNminIs a threshold value of the rotating speed of the fan; if the condition T is satisfieda＜Ta2And controlling the fan to operate at the lowest rotating speed.
When the heat pump set is in a heating mode, if the condition T is meta≥Ta3Controlling the fan to run at the highest rotating speed; if the condition T is satisfieda4≤Ta＜Ta3Then according to the formula TN ═ T (T)a－Ta3）/ （Ta4－Ta3）×（TNmax－TNmin）＋TNminAdjusting the rotating speed of the fan; wherein, Ta3And Ta4Is an ambient temperature threshold; TN is the rotating speed of the fan; TN (twisted nematic)maxAnd TNminIs a threshold value of the rotating speed of the fan; if the condition T is satisfieda＜Ta4And controlling the fan to operate at the lowest rotating speed.
It should be noted that the numbers recited in the control conditions and schemes in this patent are for better explanation only and do not represent specific parameters in the final embodiment.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A method for controlling the operation of a heat pump unit through water temperature is characterized by comprising the following steps:
obtaining the initial return water temperature T when the heat pump unit is started again1And the return water temperature T when the unit capacity is stable2And the return water temperature T obtained by taking the time interval T as a period3、T4、T5、…、Tn；
Controlling the compressor to increase, stabilize and decrease the frequency according to the difference delta T of the return water temperatures of the adjacent detection periods or regulating the compressor frequency to correct the difference of the return water temperatures of the adjacent detection periods until the return water temperature reaches the target water temperature of the unit, controlling the unit to stop and recording the compressor frequency f before the unit stops;
actual water temperature T of unitRAnd the preset target water temperature TsThe difference value of (A) reaches the preset start-stop temperature difference delta TsThe unit is restarted at an initial frequency f 'and the above steps are repeated, wherein f' is ≧ f.
2. The method for controlling the operation of the heat pump unit according to the water temperature as claimed in claim 1, wherein the specific steps of controlling the frequency increasing, the frequency stabilizing and the frequency decreasing of the compressor according to the difference Δ T between the return water temperatures of the adjacent detection periods are as follows:
if the condition delta T is less than 0.2 ℃, the compressor is positioned in the frequency increasing region, and the frequency of the compressor is controlled to be increased at the speed of 1Hz/5 min;
if the condition that delta T is more than or equal to 0.2 ℃ and less than or equal to 0.5 ℃ is met, the frequency of the compressor is kept constant when the compressor is positioned in a frequency stabilizing area;
if the condition delta T is more than 0.5 ℃ and the compressor is positioned in the frequency reduction region, controlling the compressor to reduce the frequency at the speed of 1Hz/4 min.
3. The method for controlling the operation of a heat pump unit according to the water temperature as claimed in claim 2, wherein when the compressor is located at the up-conversion region, the method further comprises the following steps:
if the condition delta T is less than-0.5 ℃ and the compressor is positioned in the frequency increasing region, controlling the compressor to increase the frequency at the speed of 1Hz/2 min;
if the condition that delta T is more than or equal to minus 0.5 ℃ and less than 0 ℃ is met, the compressor is positioned in the frequency increasing region, and the frequency of the compressor is increased at the speed of 1Hz/3 min.
4. The method for controlling the operation of a heat pump unit according to the water temperature as claimed in claim 1, wherein the specific steps of adjusting and controlling the compressor frequency to correct the difference between the return water temperatures of adjacent detection periods are as follows:
calculating the formula: Δ T' = Δ Ts/（TQ60/T), wherein TQRestarting the running time of the preset unit with the unit as follows: h; delta T' is a time correction water temperature difference value;
and adjusting the frequency of the compressor until the difference value of the return water temperatures of the adjacent detection periods reaches delta T' to maintain the frequency of the compressor constant.
5. The method for controlling the operation of a heat pump unit according to the water temperature as claimed in claim 1, wherein the specific steps of adjusting and controlling the compressor frequency to correct the difference between the return water temperatures of adjacent detection periods are as follows:
calculating the formula: Δ T "= Δ Ts/（TwT/60T), wherein TwRestarting the water temperature rising speed for a preset unit, wherein the unit is as follows: h; Δ T "is the speed corrected water temperature difference;
and adjusting the frequency of the compressor until the difference of the return water temperatures of the adjacent detection periods reaches delta T' and maintaining the frequency of the compressor constant.
6. The method of claim 1, further comprising the steps of:
if the condition delta T is less than 0.2 ℃, controlling the fan to increase the rotating speed;
if the condition that delta T is more than or equal to 0.2 ℃ and less than or equal to 0.5 ℃ is met, controlling the fan to maintain the rotating speed;
if the condition delta T is more than 0.5 ℃, controlling the fan to regulate and reduce the rotating speed.
7. The method of claim 1, further comprising the steps of:
when the heat pump unit is started again, according to the obtained environmental temperature TaAnd adjusting the rotating speed of the fan.
8. The method for controlling the operation of a heat pump unit according to the water temperature as claimed in claim 7, wherein the specific steps of adjusting the rotation speed of the fan according to the obtained ambient temperature are as follows:
when the heat pump unit is in the cooling mode,
if the condition T is satisfieda≥Ta1Controlling the fan to run at the highest rotating speed;
if the condition T is satisfieda2≤Ta＜Ta1Then according to the formula TN ═ T (T)a－Ta2）/ （Ta1－Ta2）×（TNmax－TNmin）＋TNminAdjusting the rotating speed of the fan; wherein, Ta1And Ta2Is an ambient temperature threshold; TN is the rotating speed of the fan; TN (twisted nematic)maxAnd TNminIs a threshold value of the rotating speed of the fan;
if the condition T is satisfieda＜Ta2And controlling the fan to operate at the lowest rotating speed.
9. The method for controlling the operation of a heat pump unit according to the water temperature as claimed in claim 7, wherein the specific steps of adjusting the rotation speed of the fan according to the obtained ambient temperature are as follows:
when the heat pump unit is in the heating mode,
if the condition T is satisfieda≥Ta3Controlling the fan to run at the highest rotating speed;
if the condition T is satisfieda4≤Ta＜Ta3Then according to the formula TN ═ T (T)a－Ta3）/ （Ta4－Ta3）×（TNmax－TNmin）＋TNminAdjusting the rotating speed of the fan; wherein, Ta3And Ta4Is an ambient temperature threshold; TN is the rotating speed of the fan; TN (twisted nematic)maxAnd TNminIs a threshold value of the rotating speed of the fan;
if the condition T is satisfieda＜Ta4And controlling the fan to operate at the lowest rotating speed.
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