CN103851793B - Frequency conversion heat pump water heater control method and device - Google Patents

Abstract

The invention discloses a kind of frequency conversion heat pump water heater control method and device. Wherein, the method includes: by current environmental temperature Te and reference ambient temperature Te set in advance₀Contrast, by current water temperature Tw and benchmark water temperature Tw set in advance₀Contrast, respectively obtain the first comparing result, the second comparing result; The target operating frequency f under current operation mode is determined according to the first comparing result and the second comparing result. By means of the invention it is possible to make system all run with optimal frequency under different working modes, be effectively improved systematic function, strengthen unit reliability.

Description

Frequency conversion heat pump water heater control method and device

Technical field

The present invention relates to Teat pump boiler technical field, in particular to a kind of frequency conversion heat pump water heater control method and device.

Background technology

Air energy heat pump water heater is referred to as " forth generation water heater ", and it is to consume a part of electric energy for cost (compensation), by thermodynamic cycle, the energy (heat) of storage in air is discovered and used, is used for producing hot water. Compared with traditional gas heater, electric heater, solar water heater, air energy heat pump water heater have energy-efficient, environmental protection, safe, comfortable, the many advantages such as convenient are installed. In recent years, air energy heat pump water heater is progressively for the recognition and acceptance of consumers in general institute, and the market share increases rapidly.

But existing normal air energy Teat pump boiler, unique deficiency of its existence is influenced by environmental temperature, particularly in the north that winter environment temperature is very low, system effectiveness is not as high, greatly affects the air energy heat pump water heater promotion and application in the northern area of China. Therefore the lifting of air energy heat pump water heater COP level at low ambient temperatures at present is one of subject matter urgently to be resolved hurrily.

Adopt frequency-changeable compressor, strengthen the circulating load of cold-producing medium when heating, one of the heat capacity and the major measure of operational efficiency when being improve cold operation. In recent years, the common people family of China also come into by frequency conversion heat pump air-conditioner, but frequency change water heater and transducer air conditioning the difference is that, the condensation temperature of system and evaporating temperature are affected bigger by Water in Water Tank benign environment temperature, running frequency controls complexity, therefore but without fairly perfect frequency conversion heat pump water heater control method in prior art.

For the problem lacking fairly perfect frequency conversion heat pump water heater control method in correlation technique, effective solution is not yet proposed at present.

Summary of the invention

The invention provides a kind of frequency conversion heat pump water heater control method and device, at least to solve the problems referred to above.

According to an aspect of the invention, it is provided a kind of frequency conversion heat pump water heater control method, including: by current environmental temperature Te and reference ambient temperature Te set in advance₀Contrast, by current water temperature Tw and benchmark water temperature Tw set in advance₀Contrast, respectively obtain the first comparing result, the second comparing result;The target operating frequency f under current operation mode is determined according to the first comparing result and the second comparing result.

Preferably, present mode is selected from multiple predetermined operating modes by user, and wherein, predetermined operating mode at least includes following any two kinds: energy conservation model, stan dard running model, fast speed running mode.

Preferably, the first reference operation frequency f of energy conservation model₀₁, stan dard running model the second reference operation frequency f₀₂, and the 3rd reference operation frequency f of fast speed running mode₀₃Meet the following conditions: f₀₁< f₀₂< f₀₃��

Preferably, current environmental temperature and reference ambient temperature set in advance being contrasted, before current water temperature and benchmark water temperature set in advance being contrasted, the method includes: obtained current environmental temperature and current water temperature by detection mode.

Preferably, when current operation mode is energy conservation model, include according to the target operating frequency that the first comparing result and the second comparing result are determined under current operation mode: determine target operating frequency in such a way: as the heat pump the highest ambient temperature T of operation of heat pump_emax��Te��Te₀Time, if Tw��heat pump can set the highest water temperature T wmax-5 DEG C, then calculateIf heat pump can set the highest water temperature T_wmax>=Tw > heat pump can set the highest water temperature T wmax-5 DEG C, then calculateAs Te < Te₀Time, if Te >=0 DEG C, then calculateIf the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < 0 DEG C, then calculateWherein, f₀₁For constant, and depend on compressor and system, work as Te₀=20 DEG C, Tw₀When=15 DEG C, f₀₁Frequency range be that 15Hz-40Hz, a1, a2, a3, b1, b2, b3 are constant and a1, b1 < 0,0 < a2, b2��1,0 < a3 < 1, b3 >=1.

Preferably, when current operation mode is stan dard running model, include according to the target operating frequency that the first comparing result and the second comparing result are determined under current operation mode: determine target operating frequency in such a way: as the heat pump the highest ambient temperature T of operation of heat pump_emax��Te��Te₀Time, if Tw��heat pump can set the highest water temperature T wmax-5 DEG C, then calculateCan set the highest water temperature T wmax-5 DEG C if heat pump can set the highest water temperature T wmax >=Tw > heat pump, then calculateAs the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < Te₀Time, if Te >=0 DEG C, then calculateThe minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < 0 DEG C, then calculateWherein, c1, c2, c3, d1, d2, d3 is constant, c1, d1 < 0,0 < c2, d2 < 1,0 < c3 < 1, d3 >=1, f₀₂For constant, its value is relevant with compressor and system, works as Te₀=20 DEG C, Tw₀=15 DEG C, f₀₂Frequency range be 30Hz-70Hz.

Preferably, when current operation mode is fast speed running mode, include according to the target operating frequency that the first comparing result and the second comparing result are determined under current operation mode: determine target operating frequency in such a way: by minimum for heat pump operation of heat pump ambient temperature T_eminAs described reference ambient temperature Te₀, heat pump can be set the highest water temperature T wmax-5 DEG C as described benchmark water temperature Tw0; As the heat pump the highest ambient temperature Temax of operation of heat pump >=Te >=Te₀Time, if Tw��Tw₀, then $f=f_{03}-\frac{k(T_e-T_{e\min })}{T_{e\max }-T_{e\min }};$ If Tw is > Tw₀, then $f=f_{03}-\frac{k(T_e-T_{e\min })}{T_{e\max }-T_{e\min }}-10;$ Wherein, f₀₃For the maximum running frequency that heat pump allows, this maximum running frequency allows the highest frequency run less than or equal to compressor, it is possible to be set to different values, f according to the ability difference of compressor₀₃Frequency range be 70Hz-120Hz.

According to a further aspect in the invention, it is provided that a kind of frequency conversion heat pump water heater controls device, including: contrast module, for by current environmental temperature Te and reference ambient temperature Te set in advance₀Contrast, by current water temperature Tw and benchmark water temperature Tw set in advance₀Contrast, respectively obtain the first comparing result, the second comparing result; Determine module, for determining the target operating frequency f under current operation mode according to the first comparing result and the second comparing result.

Preferably, present mode is selected from multiple predetermined operating modes by user, and wherein, predetermined operating mode at least includes following any two kinds: energy conservation model, stan dard running model, fast speed running mode.

Preferably, the first reference operation frequency f of energy conservation model₀₁, stan dard running model the second reference operation frequency f₀₂, and the 3rd reference operation frequency f of fast speed running mode₀₃Meet the following conditions: f₀₁< f₀₂< f₀₃��

Pass through the present invention, adopt and operational mode three kinds different is set, by carrying out size contrast with current environmental temperature, current water temperature and reference ambient temperature set in advance, benchmark water temperature, mode further according to the target operating frequency under comparing result calculating relevant work pattern, solve the problem lacking fairly perfect frequency conversion heat pump water heater control method in correlation technique, and then reached to make system all run with optimal frequency under different working modes, be effectively improved systematic function, strengthen the effect of unit reliability.

Accompanying drawing explanation

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention. In the accompanying drawings:

Fig. 1 is frequency conversion heat pump water heater control method flow chart according to embodiments of the present invention;

Fig. 2 is the FREQUENCY CONTROL flow chart of frequency conversion heat pump water heater compressor according to the preferred embodiment of the invention;

Fig. 3 is the structured flowchart that frequency conversion heat pump water heater according to embodiments of the present invention controls device.

Detailed description of the invention

Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments. It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.

Fig. 1 is frequency conversion heat pump water heater control method flow chart according to embodiments of the present invention, as it is shown in figure 1, the method mainly includes the following steps that (step S102-step S104):

Step S102, by current environmental temperature Te and reference ambient temperature Te set in advance₀Contrast, by current water temperature Tw and benchmark water temperature Tw set in advance₀Contrast, respectively obtain the first comparing result, the second comparing result.

Step S104, determines the target operating frequency f under current operation mode according to the first comparing result and the second comparing result.

In the present embodiment, present mode is selected from multiple predetermined operating modes by user, and wherein, predetermined operating mode at least includes following any two kinds: energy conservation model, stan dard running model, fast speed running mode.

In the present embodiment, the first reference operation frequency f of energy conservation model₀₁, stan dard running model the second reference operation frequency f₀₂, and fast speed running mode the 3rd reference operation frequency f₀₃Meet the following conditions: f₀₁< f₀₂< f₀₃��

In the present embodiment, current environmental temperature and reference ambient temperature set in advance are being contrasted, before current water temperature and benchmark water temperature set in advance being contrasted, the method includes: obtain current environmental temperature Te and current water temperature Tw by detection mode.

In the present embodiment, when current operation mode is energy conservation model, include according to the target operating frequency that the first comparing result and the second comparing result are determined under current operation mode: determine target operating frequency in such a way: as the heat pump the highest ambient temperature T of operation of heat pump_emax��Te��Te₀Time, if Tw < heat pump can set the highest water temperature T wmax-5 DEG C, then calculateCan set the highest water temperature T wmax-5 DEG C if heat pump can set the highest water temperature T wmax >=Tw >=heat pump, then calculateAs the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < Te₀Time, if Te >=0 DEG C, then calculateIf the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < 0 DEG C, then calculateWherein, f₀₁For constant, and depend on compressor and system, work as Te₀=20 DEG C, Tw₀When=15 DEG C, f₀₁Frequency range be that 15Hz-40Hz, a1, a2, a3, b1, b2, b3 are constant and a1, b1 < 0,0 < a2, b2��1,0 < a3 < 1, b3 >=1.

In the present embodiment, when current operation mode is stan dard running model, include according to the target operating frequency that the first comparing result and the second comparing result are determined under current operation mode: determine target operating frequency in such a way: as the heat pump the highest ambient temperature T of operation of heat pump_emax��Te��Te₀Time, if Tw��heat pump can set the highest water temperature T wmax-5 DEG C, then calculateCan set the highest water temperature T wmax-5 DEG C if heat pump can set the highest water temperature T wmax >=Tw > heat pump, then calculateAs the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < Te₀Time, if Te >=0 DEG C, then calculateIf the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < 0 DEG C, then calculateWherein, c1, c2, c3, d1, d2, d3 is constant, c1, d1 < 0,0 < c2, d2 < 1,0 < c3 < 1, d3 >=1, f₀₂For constant, its value is relevant with compressor and system, works as Te₀=20 DEG C, Tw₀When=15 DEG C, f₀₂Frequency range be 30Hz-70Hz.

In the present embodiment, when current operation mode is fast speed running mode, include according to the target operating frequency that the first comparing result and the second comparing result are determined under current operation mode: determine target operating frequency in such a way: by minimum for heat pump operation of heat pump ambient temperature T_eminAs described reference ambient temperature Te₀, heat pump can be set the highest water temperature T_wmax-5 DEG C as described benchmark water temperature Tw₀; As the heat pump the highest ambient temperature T of operation of heat pump_emax��Te��Te₀Time, if Tw��Tw₀, then $f=f_{03}-\frac{k(T_e-T_{e\min })}{T_{e\max }-T_{e\min }};$ If Tw is > Tw₀, then $f=f_{03}-\frac{k(T_e-T_{e\min })}{T_{e\max }-T_{e\min }}-10;$ Wherein, f₀₃For the maximum running frequency that heat pump allows, this maximum running frequency allows the highest frequency run less than or equal to compressor, it is possible to be set to different values, f according to the ability difference of compressor₀₃Frequency range be 70Hz-120Hz.

In actual applications, can pass through arrange the reference operation frequency of compressor, benchmark water temperature, reference ambient temperature and they compared with the water tank water temperature detected, ambient temperature respectively, calculate the target operating frequency of Teat pump boiler frequency-changeable compressor, by raising frequency or down conversion process, compressor current operation frequency is adjusted to target operating frequency.

Frequency conversion heat pump water heater control method above-described embodiment provided below in conjunction with Fig. 2 and effective embodiment is further described in more detail.

In embodiments discussed below, the operational mode of Teat pump boiler includes energy saver mode, mode standard and fast heat pattern.Wherein, energy saver mode is system at varying environment temperature and different water temperature conditions all with the pattern of most high energy efficiency operation; Fast heat pattern refers to meet user's heating capacity requirement, and the peak frequency that water heater allows with unit runs thus the operational mode that heated by water within a short period of time; Mode standard then, between energy-conservation and fast heat pattern, takes into account the operational mode of heating capacity and efficiency.

Refer to the FREQUENCY CONTROL flow chart that Fig. 2, Fig. 2 are frequency conversion heat pump water heater compressors according to the preferred embodiment of the invention, as in figure 2 it is shown, this flow process comprises the following steps (step S202-step S208):

Step S202, arranges the reference ambient temperature Te of energy saver mode₀, benchmark water temperature Tw₀With reference operation frequency f₀₁; The reference ambient temperature Te of mode standard is set₀, benchmark water temperature Tw₀With reference operation frequency f₀₂; Arrange energy saver mode reference ambient temperature Te₀, benchmark water temperature Tw₀It is f with reference operation frequency₀₃;

Step S204, detects current environmental temperature Te and water temperature T w;

Step S206, utilizes described reference ambient temperature, reference water gentleness reference operation frequency, the target operating frequency of the compressor under the mode of operation that calculating user selectes;

Step S208, is adjusted to target operating frequency by raising frequency or down conversion process by compressor current operation frequency.

Specifically, the computational methods calculating compressor target operating frequency are: described ambient temperature, water temperature and reference ambient temperature, benchmark water temperature are compared, and calculate the target operating frequency of compressor according to comparative result, as follows:

1, under energy conservation model:

As Te >=Te₀Time,

(1) when Tw��heat pump can set maximum temperature-5 DEG C,

(2) when Tw > heat pump can set maximum temperature-5 DEG C,

As Te < Te₀Time,

(1) during Te >=0 DEG C, $f={\left(\frac{\mathrm{Te}+273}{{\mathrm{Te}}_0+273}\right)}^{b1}\&CenterDot;{\left(\frac{T_W}{{\mathrm{Tw}}_0}\right)}^{b2}\&CenterDot;f_{01};$

(2) during the minimum ambient temperature Temin of heat pump operation of heat pump��Te < 0 DEG C, $f={b3\&CenterDot;\left(\frac{\mathrm{Te}+273}{{\mathrm{Te}}_0+273}\right)}^{b1}\&CenterDot;{\left(\frac{T_W}{{\mathrm{Tw}}_0}\right)}^{b2}\&CenterDot;f_{01};$

In formula, f₀₁For constant, its value is relevant with compressor and system, works as Te₀=20 DEG C, Tw₀=15 DEG C, time, f₀₁Taking low frequency, the frequency range being usually taken is 15Hz-40Hz, it is preferred to 20Hz. A1, a2, a3, b1, b2, b3 are constant and a1, b1 < 0,0 < a2, b2��1,0 < a3 < 1, b3 >=1.

2, under stan dard running model:

As Te >=Te₀Time,

(1) Tw��heat pump can set the highest water temperature T_wmaxWhen-5 DEG C,

(2) heat pump can set the highest water temperature T_wmax>=Tw > heat pump can set the highest water temperature T_wmax-5�� $f={c3\&CenterDot;\left(\frac{\mathrm{Te}}{{\mathrm{Te}}_0}\right)}^{c1}\&CenterDot;{\left(\frac{T_W}{{\mathrm{Tw}}_0}\right)}^{c2}\&CenterDot;f_{02};$

As Te < Te₀Time,

During Te >=0 DEG C, $f={\left(\frac{\mathrm{Te}+273}{{\mathrm{Te}}_0+273}\right)}^{d1}\&CenterDot;{\left(\frac{T_W}{{\mathrm{Tw}}_0}\right)}^{d2}\&CenterDot;f_{02};$

During the minimum ambient temperature Temin of heat pump operation of heat pump��Te < 0 DEG C,

In formula, c1, c2, c3, d1, d2, d3 is constant, c1, d1<0,0<c2, d2<1, and 0 < c3 < 1, d3>=1, f₀₂For constant, its value is relevant with compressor and system, works as Te₀=20 DEG C, Tw₀=15 DEG C, f₀₂Take medium and low frequency, be usually taken frequency range be 30Hz-70Hz, it is preferred to 50Hz;

3, under fast speed running mode:

When Tw��heat pump can set the highest water temperature T_wmaxWhen-5 DEG C,

If heat pump can set the highest water temperature T_wmax>=Tw > heat pump can set the highest water temperature T_wmax-5 DEG C, then $f=f_{03}-\frac{k(T_e-T_{e\min })}{T_{e\max }-T_{e\min }}-10;$

Wherein, f₀₃For the maximum running frequency that heat pump allows, its value��compressor allows the highest frequency run.

It should be noted that after obtaining target operating frequency, simultaneously need to reference target running frequency and the minimum operation frequency of system compressors and the highest operation frequency, final operating frequency just can be determined.Under each pattern, if calculating the minimum operation frequency of target frequency < system compressors, then run by low-limit frequency; As calculated target frequency > f₀₃, then highest frequency f is pressed₀₃Run.

In actual applications, can pass through arrange the reference operation frequency of compressor, benchmark water temperature, reference ambient temperature and they compared with the water tank water temperature detected, ambient temperature respectively, calculate the target operating frequency of Teat pump boiler frequency-changeable compressor, by raising frequency or down conversion process, compressor current operation frequency is adjusted to target operating frequency.

Adopt the frequency conversion heat pump water heater control method that above-described embodiment provides, by carrying out size contrast with current environmental temperature, current water temperature and reference ambient temperature set in advance, benchmark water temperature, the target operating frequency under relevant work pattern is calculated further according to comparing result, solve the problem lacking fairly perfect frequency conversion heat pump water heater control method in correlation technique, and then reached to enable a system to all run with optimal frequency under different working modes, be effectively improved systematic function, strengthen the effect of unit reliability.

Fig. 3 is the structured flowchart that frequency conversion heat pump water heater according to embodiments of the present invention controls device, and this device is in order to realize the frequency conversion heat pump water heater control method that above-described embodiment provides, as it is shown on figure 3, this device includes: contrasts module 10 and determines module 20. Wherein, contrast module 10, for by current environmental temperature Te and reference ambient temperature Te set in advance₀Contrast, by current water temperature Tw and benchmark water temperature Tw set in advance₀Contrast, respectively obtain the first comparing result, the second comparing result; Determine module 20, be connected to contrast module 10, for determining the target operating frequency f under current operation mode according to the first comparing result and the second comparing result.

In the present embodiment, present mode is selected from multiple predetermined operating modes by user, and wherein, predetermined operating mode at least includes following any two kinds: energy conservation model, stan dard running model, fast speed running mode.

In the present embodiment, the first reference operation frequency f of energy conservation model₀₁, stan dard running model the second reference operation frequency f₀₂, and the 3rd reference operation frequency f of fast speed running mode₀₃Meet the following conditions: f₀₁< f₀₂< f₀₃��

In actual applications, can pass through arrange the reference operation frequency of compressor, benchmark water temperature, reference ambient temperature and they compared with the water tank water temperature detected, ambient temperature respectively, calculate the target operating frequency of Teat pump boiler frequency-changeable compressor, by raising frequency or down conversion process, compressor current operation frequency is adjusted to target operating frequency.

The frequency conversion heat pump water heater that above-described embodiment provides is adopted to control device, by with current environmental temperature, current water temperature and reference ambient temperature set in advance, benchmark water temperature carries out size contrast, the target operating frequency under relevant work pattern is calculated further according to comparing result, and then by controlling compressor operation frequency, the frequency conversion heat pump water heater moment in the power save mode is made to run with most high energy efficiency, run with highest-capacity under quick mode, faster heat under mode standard, solve the problem lacking fairly perfect frequency conversion heat pump water heater control method in correlation technique, and then reached to enable a system to all run with optimal frequency under different working modes, it is effectively improved systematic function, strengthen the effect of unit reliability, and meet the demand of different user.

In from the description above, can be seen that, present invention achieves following technique effect: adopt and operational mode three kinds different is set, by with current environmental temperature, current water temperature and reference ambient temperature set in advance, benchmark water temperature carries out size contrast, mode further according to the target operating frequency under comparing result calculating relevant work pattern, solve the problem lacking fairly perfect frequency conversion heat pump water heater control method in correlation technique, and then reached to enable a system to all run with optimal frequency under different working modes, it is effectively improved systematic function, strengthen the effect of unit reliability.

Obviously, those skilled in the art should be understood that, each module of the above-mentioned present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or it is distributed on the network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, can be stored in storage device is performed by calculation element, and in some cases, shown or described step can be performed with the order being different from herein, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single integrated circuit module realize. so, the present invention is not restricted to the combination of any specific hardware and software.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.

Claims (10)

1. a frequency conversion heat pump water heater control method, it is characterised in that including:

By current environmental temperature Te and reference ambient temperature Te set in advance₀Contrast, by current water temperature Tw and benchmark water temperature Tw set in advance₀Contrast, respectively obtain the first comparing result, the second comparing result;

The target operating frequency f under current operation mode is determined according to described first comparing result and described second comparing result;

Minimum operation frequency and maximum running frequency according to described target operating frequency and system compressors determine final operating frequency, wherein, if the minimum operation frequency of described target operating frequency < system compressors, then run by described minimum operation frequency; If the maximum running frequency of described target operating frequency > system compressors, then run by described maximum running frequency;

Described maximum running frequency allows the highest frequency run less than or equal to compressor, and described maximum running frequency is set to different values according to the ability difference of described compressor.

2. method according to claim 1, it is characterized in that, described current operation mode is selected from multiple predetermined operating modes by user, and wherein, described predetermined operating mode at least includes following any two kinds: energy conservation model, stan dard running model, fast speed running mode.

3. method according to claim 2, it is characterised in that the first reference operation frequency f of described energy conservation model₀₁, described stan dard running model the second reference operation frequency f₀₂, and the 3rd reference operation frequency f of described fast speed running mode₀₃Meet the following conditions:

f₀₁< f₀₂< f₀₃��

4. method according to claim 3, it is characterised in that current environmental temperature and reference ambient temperature set in advance are being contrasted, before current water temperature and benchmark water temperature set in advance being contrasted, described method includes:

Described current environmental temperature Te and described current water temperature Tw is obtained by detection mode.

5. the method according to claim 3 or 4, it is characterised in that

When described current operation mode is described energy conservation model, include according to the target operating frequency that described first comparing result and described second comparing result are determined under current operation mode:

Determine described target operating frequency in such a way:

As the heat pump the highest ambient temperature T of operation of heat pump_emax��Te��Te₀Time,

If Tw��heat pump can set the highest water temperature T_wmax-5 DEG C, then calculate

If heat pump can set the highest water temperature T_wmax>=Tw > heat pump can set the highest water temperature T_wmax-5 DEG C, then calculate

As the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < Te₀Time,

If Te >=0 DEG C, then calculate

If the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < 0 DEG C, then calculate

Wherein, f₀₁For constant, and depend on compressor and system, work as Te₀=20 DEG C, Tw₀When=15 DEG C, f₀₁Frequency range be that 15Hz-40Hz, a1, a2, a3, b1, b2, b3 are constant and a1, b1 < 0,0 < a2, b2��1,0 < a3 < 1, b3 >=1.

6. the method according to claim 3 or 4, it is characterised in that

When described current operation mode is described stan dard running model, include according to the target operating frequency that described first comparing result and described second comparing result are determined under current operation mode:

Determine described target operating frequency in such a way:

As the heat pump the highest ambient temperature T of operation of heat pump_emax��Te��Te₀Time,

If Tw��heat pump can set the highest water temperature T_wmax-5 DEG C, then calculate

If heat pump can set the highest water temperature T wmax >=Tw > heat pump can set the highest water temperature T_wmax-5 DEG C, then calculate

As the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < Te₀Time,

If Te >=0 DEG C, then calculate

If the minimum ambient temperature T of heat pump operation of heat pump_emin�� Te < 0 DEG C, then calculate

Wherein, c1, c2, c3, d1, d2, d3 is constant, c1, d1 < 0,0 < c2, d2 < 1,0 < c3 < 1, d3 >=1, f₀₂For constant, and depend on compressor and system, work as Te₀=20 DEG C, Tw₀When=15 DEG C, f₀₂Frequency range be 30Hz-70Hz.

7. the method according to claim 3 or 4, it is characterised in that

When described current operation mode is described fast speed running mode, include according to the target operating frequency that described first comparing result and described second comparing result are determined under current operation mode:

Determine described target operating frequency in such a way:

By minimum for heat pump operation of heat pump ambient temperature T_eminAs described reference ambient temperature Te₀, heat pump can be set the highest water temperature T_wmax-5 DEG C as described benchmark water temperature Tw₀;

As the heat pump the highest ambient temperature T of operation of heat pump_emax��Te��Te₀Time,

If Tw��Tw₀, then

If Tw is > Tw₀, then

Wherein, f₀₃For the maximum running frequency that heat pump allows, this maximum running frequency allows the highest frequency run less than or equal to compressor, it is possible to be set to different values, f according to the ability difference of compressor₀₃Frequency range be 70Hz-120Hz.

8. a frequency conversion heat pump water heater controls device, it is characterised in that including:

Contrast module, for by current environmental temperature Te and reference ambient temperature Te set in advance₀Contrast, by current water temperature Tw and benchmark water temperature Tw set in advance₀Contrast, respectively obtain the first comparing result, the second comparing result;

Determine module, for determining the target operating frequency f under current operation mode according to described first comparing result and described second comparing result;

Described determine that module is additionally operable to the minimum operation frequency according to described target operating frequency and system compressors and maximum running frequency determines final operating frequency, wherein, if the minimum operation frequency of described target operating frequency < system compressors, then run by described minimum operation frequency; If the maximum running frequency of described target operating frequency > system compressors, then run by described maximum running frequency;

Described maximum running frequency allows the highest frequency run less than or equal to compressor, and described maximum running frequency is set to different values according to the ability difference of described compressor.

9. device according to claim 8, it is characterized in that, described current operation mode is selected from multiple predetermined operating modes by user, and wherein, described predetermined operating mode at least includes following any two kinds: energy conservation model, stan dard running model, fast speed running mode.

10. device according to claim 9, it is characterised in that the first reference operation frequency f of described energy conservation model₀₁, described stan dard running model the second reference operation frequency f₀₂, and the 3rd reference operation frequency f of described fast speed running mode₀₃Meet the following conditions:

f₀₁< f₀₂< f₀₃��