CN114739013B - 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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- CN114739013B CN114739013B CN202210445545.8A CN202210445545A CN114739013B CN 114739013 B CN114739013 B CN 114739013B CN 202210445545 A CN202210445545 A CN 202210445545A CN 114739013 B CN114739013 B CN 114739013B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000004321 preservation Methods 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 5
- 238000011534 incubation Methods 0.000 claims 1
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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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
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, and is started after the starting condition of the unit 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 a difference delta T between the set temperature Tset and the temperature Tsx of the water tank of the heat pump host is calculated; according to the difference value between the set water tank temperature Tset and the water tank temperature Tsx and the preset temperature difference value T SDWC Comparing to form different triggering conditions and controlling the frequency of the compressor; the water heater can meet the requirement of rapid heating of users with large water consumption and the requirement of energy conservation of users with small water consumption.
Description
Technical Field
The invention belongs to the technical field of heat pump water heaters, and particularly relates to a variable frequency control method of a heat pump water heater and a variable frequency water heater system.
Background
In recent years, the market has increasingly strong requirements on energy conservation of commercial hot water products, and along with the gradual maturation of heat pump technology, a heat pump water heater is used as efficient, energy-saving and environment-friendly equipment, and has been widely applied at home and abroad in recent years. With the development of frequency conversion technology, the frequency conversion heat pump water heater has a brand-new dew angle; commercial hot water products are gradually changed from using the fixed-frequency compressor to using the variable-frequency compressor, the overall use effect of the variable-frequency compressor is good, the high-frequency operation of the compressor is guaranteed that the capacity attenuation of a unit is small during low-temperature heating, and the low-frequency operation of the compressor is guaranteed that the unit is high in energy efficiency and low in power consumption during high-temperature heating.
The existing heat pump water heater adopts variable frequency control logic, but most of the purposes are to quickly prepare hot water, and the compressor runs at high frequency, so that the energy-saving effect cannot be achieved; in addition, except that the first heating is to heat the water in the water tank from low temperature to target temperature (generally 15-55 ℃), and the second heating is started after the water temperature in the water tank is lower than the set water temperature difference (generally 45-55 ℃), the current logic is not optimized in a targeted control manner, so that 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 unit output according to needs is guaranteed, the requirement of rapid heating of users with large water consumption can be met, and the requirement of energy saving of users with small water consumption can be met.
In order to achieve the above purpose, the main technical solution of the present invention is a variable frequency control method of a heat pump water heater, which is characterized by comprising the following steps: the heat pump host is powered on, and is started after the starting condition of the unit 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 a difference delta T between the set temperature Tset and the temperature Tsx of the water tank of the heat pump host is calculated; and comparing the difference value of the set water tank temperature Tset and the water tank temperature Tsx with a preset temperature difference value TSDWC to form different trigger conditions, and controlling the frequency of the compressor.
In some examples, after the startup condition is met, whether the startup condition is primary heating needs to be judged, and if the startup condition is primary heating, the running frequency Fn of the unit is regulated and controlled based on the standard heating frequency; when the DeltaT is detected to be less than or equal to 0 and kept for 5S, stopping the machine set at the temperature, and recording the frequency Fn-1 of the first temperature compressor; the heat pump unit 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 specific table is checked.
In some examples, if the heating is not the primary heating, recording the actual heat preservation time SBW of the water tank after detecting the delta T is more than the preset temperature difference value TSDWC again and keeping for 5S; after the actual heat preservation time SBW is different from the standard heat preservation time S0, the difference value falls into different constant intervals, and the different constant intervals correspond to different compressor running frequencies Fn, wherein the constant intervals are formed by two critical values a and b; wherein, from the second heating, the compressor sets different operation 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 the compressor operates at low frequency when the water consumption is small
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 smaller than the target water consumption, fn=Fn-1-k 1 (SBW-S0);
if the detection value of a is larger than SBW-S0 and larger than b, the water consumption is moderate, and Fn=Fn-1;
if SBW-S0 < b is detected, it means that the water consumption is larger than the standard water consumption, fn=Fn-1+k2 (S0-SBW).
In some examples, the unit start-up condition is the first detection of DeltaT > a preset temperature differential value TSDWC for 5s.
In some examples, the tank standard soak time constant s0=60; coefficient constant k1=0.2, k2=0.1; the constant a=10, b= -10.
In some examples, the preset temperature difference TSDWC ranges from 2 ℃ to 10 ℃, preferably 5 ℃.
In some examples, if the unit operable frequency is greater than or equal to the unit maximum operable frequency, assigning the unit operable maximum frequency to a unit operable frequency; if the unit operable frequency is smaller than or equal to the unit minimum operable frequency, assigning the unit operable minimum frequency to the unit operable frequency; the compressor is operated by the modified unit operating frequency.
In some examples, the unit maximum operating frequency fmin=35; minimum operating frequency of the unit
The variable-frequency water heater system adopts the variable-frequency control method.
The invention adopts the technical proposal 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 specific table is checked; from the second heating, the compressor sets different operation 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 the compressor operates at low frequency when the water consumption of the user is small.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Description of the embodiments
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention 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 appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used as references to orientations or positional relationships based on the orientations or relationships illustrated in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, so that the above terms should not be construed as limiting the present invention.
It is to be understood that the terms "a" and "an" are to be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, and in another embodiment, the number of elements may be plural, and the term "a" is not to be construed as limiting the number.
Examples
Referring to FIG. 1 of the drawings, a method for controlling frequency conversion of a heat pump water heater according to a preferred embodiment of the present invention; the heat pump host is powered on, and is started after the starting condition of the unit 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 a difference delta T between the set temperature Tset and the temperature Tsx of the water tank of the heat pump host is calculated; according to the difference value between the water tank set temperature Tset and the water tank temperature Tsx and the preset temperature difference value TSDWC, different trigger conditions are formed, and the frequency of the compressor is controlled; wherein, the starting condition is that DeltaT is detected to be more than a preset temperature difference value TSDWC for the first time and kept for 5s; the innovation point of the technical scheme is that the difference value between the set temperature Tset of the water tank and the temperature Tsx of the water tank is compared with the preset temperature difference value TSDWC to form different trigger conditions, so that the operation frequency of the compressor is accurately controlled, the requirement of rapid heating of users with large water consumption can be met, and the requirement of energy conservation of users with small water consumption can be met; the preset temperature difference TSDWC is preferably 5 ℃, but the range of the preset temperature difference TSDWC can be adjusted between 2 ℃ and 10 ℃.
Specifically, whether the starting-up condition is primary heating needs to be judged after the starting-up condition is met, so that the technical scheme is specifically and innovatively characterized in that two heating detections are carried out, different operating frequencies are set by respectively judging primary heating and non-primary heating, the heat pump unit is heated 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 a specific table is checked; from the second heating, the compressor sets different operation 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 the compressor operates at low frequency when the water consumption of the user is small.
Specifically, if primary heating is performed, the running frequency Fn of the unit is adjusted and controlled based on the standard heating frequency; when the DeltaT is detected to be less than or equal to 0 and kept for 5S, stopping the machine set at the temperature, and recording the frequency Fn-1 of the first temperature compressor;
and the standard heating frequency is based on the following table, unit (HZ):
the frequency in the upper table is set according to the outdoor load, when the ambient temperature is high, the heat absorption amount 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 amount of heat absorbed from the air is reduced, the amount of heat required by the compressor is increased, and the compressor needs to be operated at high frequency at the moment to ensure the use requirement of a user.
If it is determined that the heating is not the primary heating, detecting that DeltaT > a preset temperature difference T again SDWC After keeping for 5S, recording the actual heat preservation time SBW of the water tank; after the actual heat preservation time SBW is different from the standard heat preservation time S0, the difference value falls into different constant intervals, and the different constant intervals correspond to different compressor running frequencies Fn, wherein the constant intervals are formed by two critical values of a and b, and in the embodiment, the standard heat preservation time s0=60, a=10 and b= -10; and Fn is given its value by a different formula; the method comprises the following steps:
if the detected SBW-S0 is more than or equal to a, and the water consumption is smaller than the target water consumption, fn=Fn-1-k 1 (SBW-S0);
if the detection value of a is larger than SBW-S0 and larger than b, the water consumption is moderate, and Fn=Fn-1;
if SBW-S0 < b is detected, it means that the water consumption is larger than the standard water consumption, fn=Fn-1+k2 (S0-SBW).
The actual heat preservation time SBW is compared with the standard heat preservation time S0, the water consumption of a user can be reflected, if the actual heat preservation time SBW is larger than the standard heat preservation time S0, the water consumption of the user is considered to be small, and the frequency of the compressor is reduced when the compressor heats next time, so that the energy-saving effect is achieved; if the actual heat preservation time SBW is smaller than the standard heat preservation time S0, the water consumption of the user is considered to be large, and the frequency of the compressor is increased when the compressor heats 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 unit operable frequency Fn is greater than or equal to the unit highest operating frequency Fmax, and the unit highest operating frequency Fmax is assigned to the unit operating frequency Fn; if the unit operable frequency Fn is smaller 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 by the modified unit operation frequency Fn; in this embodiment, the highest running frequency fmin=35; the unit minimum operating frequency fmax=70; and controlling the unit operating frequency Fn between the unit highest operating frequency Fmax and the unit lowest operating frequency Fmin, so as to avoid out-of-range operation.
The following specific examples:
setting the initial starting environment temperature to 20 ℃, setting the water tank set temperature T at 50 ℃, setting the water tank actual temperature T at 20 ℃ and setting the temperature difference T at 5 ℃; frequency limit constant fmin=35, fmax=70; the coefficient constant k1=0.2, k2=0.1; standard thermal insulation time constant s0=60, constant a=10, b= -10.
1. The machine set is electrified, and DeltaT=T Set -tsx=50 ℃ -20 ℃ =30 ℃ > T set temperature difference, unit start-up, compressor running according to table frequency, compressor frequency Fn-1=50 when first to warm stop; when the set temperature difference of DeltaT & gtT is detected again and kept for 5 seconds, the water tank heat preservation time Sheat preservation=42 (the water consumption is large at the moment), sheat preservation-S0=42-60= -18 < b (-10), the machine set is started, and the compressor frequency is calculated according to the formula Fn=Fn-1+k2 (S0-Sheat preservation) =50+0.1 (60-42) =52 (the calculated result is rounded 1); since 52 is satisfied between Fmin (35) and Fmax (70), the compressor frequency is run at 52HZ, and Fn-1 = 52 is recorded when the unit is again brought to a warm stop; when the set temperature difference of DeltaT & gtT is detected again and kept for 5 seconds, the water tank heat preservation time Sheat preservation=65 (the water consumption is moderate at the moment), the conditions that a (10) & gt Sheat preservation-S0=65-60=5 is larger than or equal to b (-10) are met, the unit is started, and the compressor frequency is according to the formula fn=fn-1=52; since 52 is between Fmin (35) and Fmax (70), the compressor frequency is operated at 52HZAfter a period of time, when the unit is stopped again at a temperature, fn-1=52 is recorded, and the cycle is continued until the user is at a shutdown position.
Examples
The variable-frequency water heater system adopts the variable-frequency control method of the heat pump water heater described 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 by way of example only and are not limiting.
The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (7)
1. The variable frequency control method of the heat pump water heater is characterized by comprising the following steps of: the heat pump host is powered on, and is started after the starting condition of the unit 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 a difference delta T between the set temperature Tset and the temperature Tsx of the water tank of the heat pump host is calculated; according to the difference value between the water tank set temperature Tset and the water tank temperature Tsx and the preset temperature difference value TSDWC, different trigger conditions are formed, and the frequency of the compressor is controlled;
judging whether the starting-up condition is primary heating or not after the starting-up condition is met, and if the starting-up condition is primary heating, adjusting and controlling the running frequency Fn of the unit based on the standard heating frequency; when the DeltaT is less than or equal to 0 and is kept for 5S, stopping the machine set at the temperature, and recording the frequency Fn-1 of the first temperature compressor;
if it is determined that the heating is not the primary heating, detecting that DeltaT > a preset temperature difference T again SDWC After keeping for 5S, recording the actual heat preservation time SBW of the water tank; after the actual heat preservation time SBW is different from the standard heat preservation time S0, the difference value falls into different constant intervals, and the different constant intervals correspond to different compressor running frequencies Fn, wherein the constant intervals are formed by two critical values a and b;
the specific compressor frequency control is as follows: if the detected SBW-S0 is more than or equal to a, and the water consumption is smaller than the target water consumption, fn=Fn-1-k 1 (SBW-S0); if the detection value of a is larger than SBW-S0 and larger than b, the water consumption is moderate, and Fn=Fn-1; if SBW-S0 < b is detected, it means that the water consumption is larger than the standard water consumption, fn=Fn-1+k2 (S0-SBW).
2. The method according to claim 1, wherein the unit start-up condition is that Δt > a preset temperature difference T is detected for the first time SDWC And held for 5s.
3. The variable frequency control method according to claim 1, wherein the water tank standard incubation time constant s0=60; coefficient constant k1=0.2, k2=0.1; the constant a=10, b= -10.
4. The variable frequency control method according to claim 1, wherein the preset temperature difference TSDWC ranges from 2 ℃ to 10 ℃.
5. The variable frequency control method according to claim 1, wherein if the unit operable frequency is greater than or equal to the unit highest operable frequency, assigning the unit operable maximum frequency to a unit operable frequency; if the unit operable frequency is smaller than or equal to the unit minimum operable frequency, assigning the unit operable minimum frequency to the unit operable frequency; the compressor is operated by the modified unit operating frequency.
6. The variable frequency control method according to claim 5, wherein the unit maximum operating frequency fmin=35; the unit minimum operating frequency fmax=70.
7. A variable frequency water heater system, characterized in that the variable frequency water heater system adopts the variable frequency control method according to any one of claims 1 to 6.
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