CN114739013A - Variable frequency control method of heat pump water heater and variable frequency water heater system - Google Patents
Variable frequency control method of heat pump water heater and variable frequency water heater system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000004321 preservation Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 5
- 238000004134 energy conservation Methods 0.000 description 3
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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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
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- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention particularly relates to a variable frequency control method of a heat pump water heater and a variable frequency water heater system, which comprise the following steps: the heat pump host is powered on, the unit is started after the starting condition is met, the set temperature Tset of the water tank and the temperature Tsx of the water tank of the heat pump host are detected, and the difference value delta T between the set temperature Tset of the water tank and the temperature Tsx of the water tank of the heat pump host is calculated; according to the difference value between the set temperature Tset of the water tank and the temperature Tsx of the water tank and the preset temperature difference value TSDWCComparing to form different trigger conditions, and controlling the frequency of the compressor; not only can meet the requirement of rapid heating of users with large water consumption, but also can meet the energy saving requirement of users with small water consumptionThe requirements of (a).
Description
Technical Field
The invention belongs to the technical field of heat pump water heaters, and particularly relates to a frequency conversion control method of a heat pump water heater and a frequency conversion water heater system.
Background
In recent years, the market has stronger requirements on energy conservation of commercial hot water products, and along with the gradual maturity of heat pump technology, a heat pump water heater is used as efficient, energy-saving and environment-friendly equipment and is increasingly widely applied at home and abroad in recent years. With the development of the frequency conversion technology, the frequency conversion heat pump water heater has been completely exposed; commercial hot water products have gradually turned to inverter compressor from using the constant frequency compressor, and inverter compressor is whole excellent in use effect, and compressor high frequency operation guarantees that the unit ability attenuates when low temperature heats, and compressor low frequency operation guarantees the high energy efficiency of unit when high temperature heats, and is power consumptive low.
Although the existing heat pump water heater adopts the frequency conversion control logic, the purpose is that the water is quickly heated, and the compressor runs at high frequency, so that the energy-saving effect cannot be achieved; in addition, except for the first heating, the water in the water tank is heated from low temperature to the target temperature (generally 15-55 ℃), and the water in the water tank is heated from the second heating after the water temperature in the water tank is lower than the set water temperature difference (generally 45-55 ℃), so that the current logics are not controlled and optimized in a targeted manner, and the energy-saving effect cannot be achieved.
Disclosure of Invention
The invention aims to provide a variable frequency control method of a heat pump water heater and a variable frequency water heater system; the output of the unit is ensured according to the requirement, the requirement of the user with large water consumption for rapid heating can be met, and the requirement of the user with small water consumption for energy conservation can be met.
In order to achieve the above object, the main technical solution of the present invention is a method for controlling frequency conversion of a heat pump water heater, comprising the steps of: the heat pump host is powered on, the unit is started after the starting condition is met, the set temperature Tset of the water tank and the temperature Tsx of the water tank of the heat pump host are detected, and the difference value delta T between the set temperature Tset of the water tank and the temperature Tsx of the water tank of the heat pump host is calculated; according to the difference value between the set temperature Tset of the water tank and the temperature Tsx of the water tank and the preset temperature difference value TSDWCDifferent trigger conditions are formed through comparison, and the frequency of the compressor is controlled.
In some examples, after the starting condition is met, whether the starting condition is primary heating or not needs to be judged, and if the starting condition is primary heating, the operation frequency Fn of the unit is adjusted and controlled based on the standard heating frequency; when the delta T is detected to be less than or equal to 0, and after 5S is kept, the unit is stopped when reaching the temperature, and the frequency Fn-1 of the compressor reaching the temperature for the first time is recorded; the heat pump set heats for the first time, and the compressor sets different operating frequencies according to the difference of the ambient temperature and the water tank temperature Tsx, and the operation frequency is obtained by specifically looking up the table.
In some examples, if the water tank is judged not to be heated for the first time, when the delta T is checked to be larger than the set temperature difference T again and kept for 5S, recording the actual heat preservation time S of the water tankBW(ii) a And passing the actual heat preservation time SBWAfter the difference is made with the standard heat preservation time S0, the difference value falls into different constant intervals, and the different constant intervals correspond to different compressor operating frequencies Fn, wherein the constant interval is formed by two critical values a and b; wherein, from the second time heating, the compressor sets for different operating frequency according to user's actual water use condition, specifically for compressor high frequency operation when user's water consumption is big, compressor low frequency operation when the water consumption is little.
In some examples, its specific compressor frequency control is:
if the detected SBW-S0 is more than or equal to a and the water consumption is less than the target water consumption, Fn is Fn-1-k1 (SBW-S0);
if a is detected to be more than SBW-S0 and more than or equal to b, indicating that the water consumption is moderate, Fn is equal to Fn-1;
if the detected SBW-S0 < b indicates that the water consumption is larger than the standard water consumption, Fn is Fn-1+ k2 (S0-SBW).
In some examples, the unit start-up condition is that Δ T > the set temperature difference T is detected for the first time and is maintained for 5 s.
In some examples, the water tank standard holding time constant S0 ═ 60; the coefficient constant K1 is 0.2, K2 is 0.1; the constant a is 10 and b is-10.
In some examples, the temperature difference value T is presetSDWCIn the range of 2 to 10 degrees celsius, preferably 5 degrees celsius.
In some examples, if the unit operable frequency is greater than or equal to the unit maximum operating frequency, assigning the unit maximum operating frequency to a unit operating frequency; if the unit operable frequency is less than or equal to the lowest unit operating frequency, assigning the minimum unit operating frequency to the unit operating frequency; the compressor is operated by the modified unit operating frequency.
In some examples, the maximum operating frequency Fmin of the unit is 35; and the lowest operating frequency Fmax of the unit is 70.
The variable-frequency water heater system adopts the variable-frequency control method.
The invention adopts the technical scheme to realize the following effects:
the heat pump unit heats for the first time, the compressor sets different operating frequencies according to the difference of the ambient temperature and the water tank temperature Tsx, and the operation frequency is obtained by specifically looking up a table; from the second heating, the compressor sets different operating frequencies according to the actual water consumption condition of the user, specifically, the compressor operates at high frequency when the water consumption of the user is large, and operates at low frequency when the water consumption is small.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
It is to be understood that the terms "a" and "an" are to be interpreted as meaning that a number of one element may be one in one embodiment or multiple in another embodiment, and the terms "a" and "an" are not to be interpreted as limiting the number.
The first embodiment is as follows:
referring to fig. 1 of the drawings of the present specification, a method for controlling a variable frequency of a heat pump water heater according to a preferred embodiment of the present invention; the heat pump host is powered on, the unit is started after the starting condition is met, the set temperature Tset of the water tank and the temperature Tsx of the water tank of the heat pump host are detected, and the difference value delta T between the set temperature Tset of the water tank and the temperature Tsx of the water tank of the heat pump host is calculated; according to the difference value between the set temperature Tset of the water tank and the temperature Tsx of the water tank and the preset temperature difference value TSDWCComparing to form different trigger conditions, and controlling the frequency of the compressor; wherein the starting condition is that the delta T is detected for the first time to be larger than the set temperature difference T and is kept for 5 s; the innovation point of the technical scheme is that the difference value of the set temperature Tset of the water tank and the temperature Tsx of the water tank and the preset temperature difference value TSDWCDifferent trigger conditions are formed by comparison to accurately control the running frequency of the compressor, so that the requirement of a user with large water consumption for rapid heating can be met, and the requirement of a user with small water consumption for energy conservation can be met; wherein the temperature difference value T is presetSDWCPreferably 5 c, but the range can be adjusted between 2 c and 10 c.
Specifically, after the starting condition is met, whether the starting condition is primary heating or not needs to be judged, so that the technical scheme has the specific innovation point that two times of heating detection is carried out, different operation frequencies are set by respectively judging primary heating and non-primary heating, a heat pump unit carries out primary heating, a compressor sets different operation frequencies according to the difference of the environment temperature and the water tank temperature Tsx, and the operation frequencies are obtained by specifically looking up a table; from the second heating, the compressor sets different operating frequencies according to the actual water consumption condition of the user, specifically, the compressor operates at high frequency when the water consumption of the user is large, and operates at low frequency when the water consumption is small.
Specifically, if the heating is primary heating, the operation frequency Fn of the unit is adjusted and controlled based on the standard heating frequency; when the delta T is detected to be less than or equal to 0, and after 5S is kept, the unit is stopped when reaching the temperature, and the frequency Fn-1 of the compressor reaching the temperature for the first time is recorded;
and the standard heating frequency is based on the following table, unit (HZ):
the frequency in the upper table is set according to outdoor load, when the ambient temperature is high, the heat absorption capacity of the unit from the air is large, the heat required by the compressor is small, and the low-frequency operation can ensure the high energy efficiency of the unit, save energy and electricity; when the ambient temperature is low, the heat absorption capacity from the air is reduced, the heating capacity required by the compressor is increased, and at the moment, high-frequency operation is required to ensure the use requirement of a user.
If the water tank is judged not to be heated for the first time, when the temperature difference T is checked to be more than the set temperature difference T again and kept for 5S, the actual heat preservation time S of the water tank is recordedBW(ii) a And passing the actual heat preservation time SBWAfter the difference from the standard holding time S0 is made, the difference falls into different constant intervals corresponding to different compressor operating frequencies Fn, where the constant interval is formed by two critical values a and b, in this embodiment, the standard holding time S0 is 60, a is 10, and b is-10; fn is given a value by a different formula; the method comprises the following specific steps:
if it detects SBW-S0 ≧ a, which indicates that the water consumption is less than the target water consumption, Fn ═ Fn-1-k1 × (S)BW-S0)；
If the detection a > SBW-S0 ≧ b, which means moderate water consumption, Fn ═ Fn-1;
if it detects SBW(ii) S0 < b, which means that the amount of water used is larger than the standard amount of water, Fn-1+ k2 (S0-S)BW)。
Wherein the actual holding time SBWKeeping the temperature with the standardThe comparison of the time S0 can reflect the water consumption of the user, if the actual heat preservation time SBWIf the standard heat preservation time is longer than S0, the water consumption of the user is considered to be low, and the frequency of the compressor is reduced for the next heating, so that the energy-saving effect is achieved; if the actual holding time SBWIf the standard heat preservation time is shorter than S0, the water consumption of the user is considered to be large, and the frequency of the compressor is increased when the user heats the air for the next time, so that the use requirement of the user is met.
When the Fn value is obtained through calculation, the Fn value is modified, and the modification process is that the operable frequency Fn of the unit is greater than or equal to the maximum operating frequency Fmax of the unit, the maximum operating frequency Fmax of the unit is assigned to the operating frequency Fn of the unit; if the unit operable frequency Fn is less than or equal to the unit minimum operating frequency Fmin, assigning the unit minimum operating frequency Fmin to the unit operating frequency Fn; the compressor is operated through the modified unit operating frequency Fn; in the embodiment, the highest operation frequency Fmin of the unit is 35; the lowest operation frequency Fmax of the unit is 70; and controlling the unit operation frequency Fn between the maximum unit operation frequency Fmax and the minimum unit operation frequency Fmin, so as to avoid out-of-range operation.
One specific example is as follows:
setting the initial starting environment temperature to be 20 ℃, the set water tank temperature Twater tank to be 50 ℃, the actual water tank temperature Twater tank to be 20 ℃ and the T set temperature difference to be 5 ℃; the frequency limit constant Fmin is 35, Fmax is 70; the coefficient constant k1 is 0.2, k2 is 0.1; the standard holding time constant of the water tank S0 is 60, the constant a is 10, and the constant b is-10.
1. The unit is powered on, and delta T is equal to TSDWC-TSXSetting temperature difference between 50 ℃ and 20 ℃ and more than 30 ℃ and more than T, starting the unit, operating the compressor according to table frequency, and stopping the unit when the temperature is reached for the first time, wherein the frequency Fn-1 of the compressor is 50; when the set temperature difference of delta T & gt T is detected again and kept for 5S, the heat preservation time S of the water tank is 42 (the water consumption is large at this time), the heat preservation-S0-42-60-18 & lt b (-10) is met, the unit is started, and the frequency of the compressor is 50+0.1(60-42) 52 (the calculation result is rounded by 1) according to the formula Fn-1+ k2 (S0-S heat preservation); since 52 is satisfied between Fmin (35) and Fmax (70), the compressor frequency is operating at 52HZWhen the unit is stopped again at the temperature, the record Fn-1 is 52; when the set temperature difference of delta T & gt T is detected again and kept for 5S, the heat preservation time S of the water tank is 65 (the water consumption is moderate at the moment), the condition that a (10) & gt S heat preservation-S0 is 65-60, 5 is not less than b (-10), the unit is started, and the frequency of the compressor is 52 according to the formula Fn-1; since 52 is satisfied between Fmin (35) and Fmax (70), the compressor frequency is run at 52HZ, and after a while, when the unit is again brought to warm shutdown, Fn-1 is recorded as 52, and the process is repeated until the user is shut down.
Example two:
the variable-frequency water heater system adopts the variable-frequency control method of the heat pump water heater explained in the first embodiment.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention.
The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (10)
1. A frequency conversion control method of a heat pump water heater is characterized by comprising the following steps:
the heat pump host is powered on, the unit is started after the starting condition is met, the set temperature Tset of the water tank and the temperature Tsx of the water tank of the heat pump host are detected, and the difference value delta T between the set temperature Tset of the water tank and the temperature Tsx of the water tank of the heat pump host is calculated; according to the difference value between the set temperature Tset of the water tank and the temperature Tsx of the water tank and the preset temperature difference value TSDWCDifferent trigger conditions are formed through comparison, and the frequency of the compressor is controlled.
2. The frequency conversion control method according to claim 1, wherein after the startup condition is met, whether the startup condition is initial heating needs to be judged, and if the startup condition is initial heating, the operating frequency Fn of the unit is adjusted and controlled based on a standard heating frequency; and when detecting that the delta T is less than or equal to 0, keeping for 5S, stopping the unit when the temperature is up, and recording the frequency Fn-1 of the compressor when the temperature is up for the first time.
3. The frequency conversion control method according to claim 2, characterized in that if it is determined that the heating is not the initial heating, after checking again that Δ T > the set temperature difference T and keeping for 5S, the actual holding time S of the water tank is recordedBW(ii) a And passing the actual heat preservation time SBWAfter the difference with the standard heat preservation time S0 is made, the difference falls into different constant intervals, and the different constant intervals correspond to different compressor operation frequencies Fn, wherein the constant intervals are formed by two critical values a and b.
4. The frequency conversion control method according to claim 3, wherein the specific compressor frequency control is:
if it detects SBW-S0 ≧ a, which indicates that the water consumption is less than the target water consumption, Fn ═ Fn-1-k1 × (S)BW-S0)；
If the detection a > SBW-S0 ≧ b, which means moderate water consumption, Fn ═ Fn-1;
if it detects SBW-S0 < b, meaning that water usage is greater than the standard water usage, Fn ═ Fn-1+ k2 ═ S0-SBW)。
5. The frequency conversion control method according to claim 1, wherein the unit start-up condition is that Δ T > a set temperature difference T is detected for the first time and is maintained for 5 s.
6. The frequency conversion control method according to claim 4, wherein the standard holding time constant of the water tank is S0-60; the coefficient constant K1 is 0.2, K2 is 0.1; the constant a is 10 and b is-10.
7. Frequency conversion control method according to claim 1, characterized in that the temperature difference value T is presetSDWCIn the range of 2 to 10 degrees celsius, preferably 5 degrees celsius.
8. The frequency conversion control method according to claim 1, wherein if the unit operable frequency is greater than or equal to the unit maximum operating frequency, assigning the unit maximum operating frequency to a unit operating frequency; if the unit operable frequency is less than or equal to the lowest unit operating frequency, assigning the minimum unit operating frequency to the unit operating frequency; the compressor is operated by the modified unit operating frequency.
9. The frequency conversion control method according to claim 8, wherein the maximum operating frequency Fmin of the unit is 35; and the lowest operating frequency Fmax of the unit is 70.
10. A variable frequency water heater system, characterized in that the variable frequency water heater system adopts the variable frequency control method of any one of claims 1 to 9.
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