CN105987501B - The control method of electric expansion valve in frequency conversion heat pump water heater system - Google Patents
The control method of electric expansion valve in frequency conversion heat pump water heater system Download PDFInfo
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- CN105987501B CN105987501B CN201510050018.7A CN201510050018A CN105987501B CN 105987501 B CN105987501 B CN 105987501B CN 201510050018 A CN201510050018 A CN 201510050018A CN 105987501 B CN105987501 B CN 105987501B
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Abstract
The invention discloses a kind of control methods of electric expansion valve in frequency conversion heat pump water heater system, belong to electronic expansion valve controls field, design to solve the problems such as electric expansion valve in existing control method obviously lags behind compressor frequency variation.The control method of electric expansion valve is the step number K that electric expansion valve is adjusted according to the frequency f of compressor in frequency conversion heat pump water heater system of the present invention.The control method of electric expansion valve is more direct to the adjustment of electric expansion valve step number K in frequency conversion heat pump water heater system of the present invention, the response speed of electric expansion valve faster, solves the problems such as slow electric expansion valve response speed in the prior art, response lag, poor accuracy.
Description
Technical field
The present invention relates to a kind of control methods of electric expansion valve in frequency conversion heat pump water heater system.
Background technique
Electric expansion valve is generallyd use in frequency conversion heat pump water heater system to control cold medium flux, when compressor frequency becomes
Cold medium flux is also required to change correspondingly when change.The method of existing control electric expansion valve mainly includes discharge superheat method and suction
Gas degree of superheat method.
1, discharge superheat method is survey calculation evaporator outlet degree of superheat numerical value, adjusts electricity according to the degree of superheat numerical value
The aperture of sub- expansion valve.This method is more by rule of thumb, to lead to poor accuracy；And the adjustment of electric expansion valve is obviously stagnant
Afterwards in the variation of compressor frequency, it is easy to appear fluctuation, concussion.
2, suction superheat method is that sense packet is arranged in compressor air entry, measures temperature using the sense packet.But sense packet measurement
Result be not true temperature, lead to have deviation to the adjustment of electric expansion valve, equally can obviously lag behind compressor frequency
Variation.
Summary of the invention
More direct, electric expansion valve response speed that the purpose of the present invention is to propose to a kind of pair of electric expansion valve step number adjustment is more
The control method of electric expansion valve in fast frequency conversion heat pump water heater system.
To achieve this purpose, the present invention adopts the following technical scheme:
The control method of electric expansion valve in a kind of frequency conversion heat pump water heater system, the control method is according to compressor
Frequency f adjust the step number K of electric expansion valve.
In particular, the control method includes the following steps:
Unit heating capacity Q is calculated when the frequency of compressor is adjusted to f for step 1；
Unit circulating refrigerant mass flow m is calculated according to the unit heating capacity Q in step 2；
Circulation area S is calculated according to the unit circulating refrigerant mass flow m in step 3；
Step 4, the step number K that electric expansion valve is calculated according to the circulation area S, control device is by electric expansion valve
Step number be adjusted to K.
Further, it is calculated with formula 1 to obtain the unit heating capacity Q in the step 1:
Formula 1
Wherein, f0For the frequency of a certain moment compressor, Q0It is f for compressor frequency0When unit heating capacity；C is water
Specific volume is 4.187kj/kg DEG C of constant；V is the volume of water in water tank, and unit is to rise；Δ T be heating water temperature difference, unit be DEG C,
It can be obtained by the detection of water tank temperature sensor；T is the water heating time that water temperature rises Δ T, and unit is the second.
In particular, the unit circulating refrigerant mass flow m is calculated using formula 2 in the step 2:
Formula 2
Wherein, h1The corresponding enthalpy of gaseous refrigerant, h are overheated for exhaust outlet of compressor3Supercooled liquid is exported for condenser box
The corresponding enthalpy of cryogen.
Further, overheated gas enthalpy h is calculated using formula 31:
Formula 3
Wherein, a5To a14For constant relevant to refrigerant category；Ts is delivery temperature tp+273, unit K；Tsat is
Condensation temperature is equal to water temperature tw+8+273, unit K.
In particular, calculating liquid enthalpy h using formula 43:
4 h of formula3=a1+a2Tsat+a3Tsat2+a4Tsat3
Wherein, a1To a4For constant relevant to refrigerant category；Tsat is condensation temperature, is equal to water temperature tw+8+273, single
Position K.
In particular, calculating circulation area S using formula 5 in the step 3:
Formula 5
Wherein, Cd is discharge coefficient；ρ is the density of inlet refrigerant, unit Kg/m3；P1And P2Respectively expansion valve
Inlet pressure and outlet pressure.
Further, the inlet pressure P of the expansion valve1With outlet pressure P2It is obtained, or passed through by pressure sensor measurement
Condensation temperature and evaporation temperature are calculated.
In particular, electric expansion valve step number K is calculated using formula 6 in the step 4:
6 S=aK of formula3+bK2+cK+d
Wherein, a, b, c, d are respectively constant.
The control method of electric expansion valve is adjusted according to the frequency f of compressor in frequency conversion heat pump water heater system of the present invention
The step number K of electric expansion valve, more direct to the adjustment of electric expansion valve step number K, the response speed of electric expansion valve faster, solves
The problems such as electric expansion valve response speed in the prior art of having determined is slow, response lag, poor accuracy.
Detailed description of the invention
Fig. 1 is the control method of electric expansion valve in the frequency conversion heat pump water heater system of the offer of the preferred embodiment of the present invention one
Flow chart；
Fig. 2 is the flow of electronic expansion valve figure that the preferred embodiment of the present invention one provides.
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
Preferred embodiment one:
This preferred embodiment discloses a kind of control method of electric expansion valve in frequency conversion heat pump water heater system.Such as Fig. 1 institute
Show, which includes the following steps:
Unit heating capacity Q is calculated when the frequency of compressor is adjusted to f for step 1.Specifically, being calculated with formula 1
Obtain unit heating capacity Q:
Formula 1
Wherein, f0It for the frequency of a certain moment compressor, or is the frequency at current time, which is in systems can be with
Automatic measurement；Q0It is f for compressor frequency0When unit heating capacity；C is the specific volume of water, is 4.187kj/kg DEG C of constant；V is
The volume of water in water tank, unit are to rise；Δ T be heating water temperature difference, unit be DEG C, which can be detected by water tank temperature sensor
It obtains；T is the water heating time that water temperature rises Δ T, and unit is the second.
Unit circulating refrigerant mass flow m is calculated according to unit heating capacity Q for step 2 (unit is Kg/s).Specifically
, unit circulating refrigerant mass flow m is calculated using formula 2:
Formula 2
Wherein, h1The corresponding enthalpy of gaseous refrigerant is overheated for exhaust outlet of compressor, unit is Kj/Kg；h3For water tank condensation
Device exports the corresponding enthalpy of sub-cooled liquid refrigerant, and unit is Kj/Kg.
Overheated gas enthalpy h1It can use formula 3 to be calculated:
Formula 3
Wherein, a5To a14For constant relevant to refrigerant category；Ts is delivery temperature tp+273, unit K；Tsat is
Condensation temperature is equal to water temperature tw+8+273, unit K.
Liquid enthalpy h3It can use formula 4 to be calculated:
4 h of formula3=a1+a2Tsat+a3Tsat2+a4Tsat3
Wherein, a1To a4For constant relevant to refrigerant category；Tsat is condensation temperature, is equal to water temperature tw+8+273, single
Position K.
When refrigerant is R410A: a1=200000, a2=1465, a3=2.5308, a4=0.0692；a5=423586,
a6=367.3, a7=-2.989, a8=-0.051, a9=0.0024, a10=-0.015, a11=1.8E-06, a12=-1.14E-
07, a13=2.94E-07, a14=-2.5E-09.
Circulation area S (unit value m is calculated according to unit circulating refrigerant mass flow m in step 32).Specifically, sharp
Circulation area S is calculated with formula 5:
Formula 5
Wherein, Cd is discharge coefficient, which can find in available data；ρ is the density of inlet refrigerant, single
Position is Kg/m3；P1And P2The respectively inlet pressure and outlet pressure of expansion valve.The inlet pressure P of expansion valve1With outlet pressure P2
It is obtained by pressure sensor measurement, or is calculated by condensation temperature and evaporation temperature.
Step 4, the step number K that electric expansion valve is calculated according to circulation area S, control device is by the step of electric expansion valve
Number is adjusted to K.Specifically, electric expansion valve step number K is calculated using formula 6:
6 S=aK of formula3+bK2+cK+d
Wherein, a, b, c, d are respectively constant, can be obtained according to the flow of electronic expansion valve figure that producer provides, such as Fig. 2 institute
Show.
The control method of this preferred embodiment electric expansion valve can be adjusted accurately and in time according to compressor frequency f
The step number K of electric expansion valve improves the water heating efficiency of frequency conversion air source hot pump water heater；Without increase additional hardware,
It only needs to be modified the parameter in controller, it is easy to use, it is at low cost.
Preferred embodiment two:
This preferred embodiment discloses a kind of control method of electric expansion valve in frequency conversion heat pump water heater system.With preferred reality
It is that the control method includes the following steps: that it is identical, which to apply example one,
Unit heating capacity Q is calculated when the frequency of compressor is adjusted to f for step 1；
Unit circulating refrigerant mass flow m is calculated according to unit heating capacity Q for step 2；
Circulation area S is calculated according to unit circulating refrigerant mass flow m in step 3；
Step 4, the step number K that electric expansion valve is calculated according to circulation area S, control device is by the step of electric expansion valve
Number is adjusted to K.
The difference is that: it is not limited to that unit heating capacity Q is calculated using formula 1 in step 1, it now in the art can root
The method that unit heating capacity Q is calculated according to the frequency f of compressor；It is not limited to that machine is calculated using formula 2 in step 2
Group circulating refrigerant mass flow m, can now be calculated unit circulating refrigerant mass flow m according to unit heating capacity Q in the art
Method；It is not limited to that circulation area S is calculated using formula 5 in step 3, can now be recycled in the art according to unit cold
The method that circulation area S is calculated in matchmaker's mass flow m；It is not limited to that electronic expansion is calculated using formula 6 in step 4
The method of the step number K of electric expansion valve can be calculated in the step number K of valve according to circulation area S in the prior art.
Preferred embodiment three:
This preferred embodiment discloses a kind of control method of electric expansion valve in frequency conversion heat pump water heater system, the controlling party
Method is the step number K that electric expansion valve is adjusted according to the frequency f of compressor.The specific steps of the control method are unlimited, can utilize
Electric expansion valve step number K is calculated according to compressor frequency f in existing formula.
Claims (7)
1. the control method of electric expansion valve in a kind of frequency conversion heat pump water heater system, which is characterized in that the control method is
The step number K of electric expansion valve is adjusted according to the frequency f of compressor, and the control method includes the following steps:
Unit heating capacity Q is calculated when the frequency of compressor is adjusted to f for step 1；
Unit circulating refrigerant mass flow m is calculated according to the unit heating capacity Q in step 2；
Circulation area S is calculated according to the unit circulating refrigerant mass flow m in step 3；
Step 4, the step number K that electric expansion valve is calculated according to the circulation area S, control device is by the step of electric expansion valve
Number is adjusted to K；
It is calculated with formula 1 to obtain the unit heating capacity Q in the step 1:
Formula 1
Wherein, f0For the frequency of a certain moment compressor, Q0It is f for compressor frequency0When unit heating capacity；C is the ratio of water
Hold, is 4.187kj/kg DEG C of constant；V is the volume of water in water tank, and unit is to rise；Δ T be heating water temperature difference, unit be DEG C, energy
It is obtained by the detection of water tank temperature sensor；T is the water heating time that water temperature rises Δ T, and unit is the second.
2. the control method of electric expansion valve in frequency conversion heat pump water heater system according to claim 1, which is characterized in that
The unit circulating refrigerant mass flow m is calculated using formula 2 in the step 2:
Formula 2
Wherein, h1The corresponding enthalpy of gaseous refrigerant, h are overheated for exhaust outlet of compressor3Supercooled liquid system is exported for condenser box
The corresponding enthalpy of cryogen.
3. the control method of electric expansion valve in frequency conversion heat pump water heater system according to claim 2, which is characterized in that
Overheated gas enthalpy h is calculated using formula 31:
Formula 3
Wherein, a5To a14For constant relevant to refrigerant category；Ts is delivery temperature tp+273, unit K；Tsat is cold
Solidifying temperature, is equal to water temperature tw+8+273, unit K.
4. the control method of electric expansion valve in frequency conversion heat pump water heater system according to claim 2, which is characterized in that
Liquid enthalpy h is calculated using formula 43:
Formula 4
Wherein, a1To a4For constant relevant to refrigerant category；Tsat is condensation temperature, is equal to water temperature tw+8+273, unit
K。
5. the control method of electric expansion valve in frequency conversion heat pump water heater system according to claim 1, which is characterized in that
Circulation area S is calculated using formula 5 in the step 3:
Formula 5
Wherein, Cd is discharge coefficient；ρ is the density of inlet refrigerant, unit Kg/m3；P1And P2The respectively import of expansion valve
Pressure and outlet pressure.
6. the control method of electric expansion valve in frequency conversion heat pump water heater system according to claim 5, which is characterized in that
The inlet pressure P of the expansion valve1With outlet pressure P2It is obtained by pressure sensor measurement, or passes through condensation temperature and steaming
Hair temperature is calculated.
7. the control method of electric expansion valve in frequency conversion heat pump water heater system according to claim 1, which is characterized in that
Electric expansion valve step number K is calculated using formula 6 in the step 4:
Formula 6
Wherein, a, b, c, d are respectively constant.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201569156U (en) * | 2009-11-19 | 2010-09-01 | 苏州大学 | Air source heat pump water heater |
| CN201582983U (en) * | 2009-12-28 | 2010-09-15 | 清华大学 | Cycling back-heat heat pump water heater |
| CN201819477U (en) * | 2010-09-08 | 2011-05-04 | 宁波奥克斯电气有限公司 | Direct-current frequency-conversional multi-connected multifunction air-conditioner |
| KR20110090663A (en) * | 2010-02-04 | 2011-08-10 | 엘지전자 주식회사 | Heat pump water heater and method of controlling thereof |
| CN102575882A (en) * | 2009-10-20 | 2012-07-11 | 三菱电机株式会社 | Heat pump device |
-
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- 2015-01-30 CN CN201510050018.7A patent/CN105987501B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102575882A (en) * | 2009-10-20 | 2012-07-11 | 三菱电机株式会社 | Heat pump device |
| CN201569156U (en) * | 2009-11-19 | 2010-09-01 | 苏州大学 | Air source heat pump water heater |
| CN201582983U (en) * | 2009-12-28 | 2010-09-15 | 清华大学 | Cycling back-heat heat pump water heater |
| KR20110090663A (en) * | 2010-02-04 | 2011-08-10 | 엘지전자 주식회사 | Heat pump water heater and method of controlling thereof |
| CN201819477U (en) * | 2010-09-08 | 2011-05-04 | 宁波奥克斯电气有限公司 | Direct-current frequency-conversional multi-connected multifunction air-conditioner |
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Effective date of registration: 20201113 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO ECONOMIC DEVELOPMENT ZONE HAIER WATER HEATER Co.,Ltd. Patentee after: Zhengzhou Haier New Energy Technology Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO ECONOMIC DEVELOPMENT ZONE HAIER WATER HEATER Co.,Ltd. |