CN102425841A - Method for controlling machine room air conditioner based on variable frequency compressor - Google Patents
Method for controlling machine room air conditioner based on variable frequency compressor Download PDFInfo
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- CN102425841A CN102425841A CN201110395905XA CN201110395905A CN102425841A CN 102425841 A CN102425841 A CN 102425841A CN 201110395905X A CN201110395905X A CN 201110395905XA CN 201110395905 A CN201110395905 A CN 201110395905A CN 102425841 A CN102425841 A CN 102425841A
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Abstract
The invention relates to a method for controlling a machine room air conditioner based on a variable frequency compressor. The method comprises the following steps of: 1, initializing the machine room air conditioner, and returning an electronic expansion valve to zero; 2, starting an evaporator, and regulating the air velocity of a fan of the evaporator according to air suction pressure Ps; 3, starting the variable frequency compressor, and regulating the frequency H of the variable frequency compressor according to the indoor temperature T0 and the preset temperature TA; 4, starting a condenser in time T2 after the variable frequency compressor is started, and controlling the air velocity of a fan of the condenser according to exhaust pressure PD and the air inlet temperature TD; and 5, controlling the opening Pm of the electronic expansion valve, and performing corresponding compensation on the opening Pm of the electronic expansion valve according to the frequency of the variable frequency compressor. By adopting the method for controlling the machine room air conditioner based on the variable frequency compressor, the temperature is controlled more stably and the fluctuation is low; and the opening of the expansion valve is compensated through the variable frequency compressor, so that the superheat degree is more stable and close to the expected target value.
Description
Technical field
The present invention relates to refrigeration system, more particularly, relate to a kind of air conditioner in machine room control method based on frequency-changeable compressor.
Background technology
Precise machine room air conditioner is that its operating accuracy and reliability are all much higher than common air-conditioning to the special air conditioner of modern electronic equipment machine room design.Put computer equipment and programme-controlled exchange product etc. in the computer room, form by a large amount of intensive electronic components.Improve the stable and reliability that these equipment use, need the temperature humidity of environment is strict controlled in particular range.
Special air conditioning for device room adopts evaporating pressure in the strict control evaporimeter in design; The increase air output makes the evaporator surface temperature be higher than the air dew point temperature and does not dehumidify, and the cold of generation all is used for lowering the temperature, and has improved operating efficiency; Reduced wet amount loss (air output is big, and the air-supply enthalpy difference reduces).
Because of the electronic equipment in most of machine rooms all is to move continuously, the working time is long, therefore requires special air conditioning for device room in design, can load greatly and turns round continuously throughout the year, and will keep high reliability.Comfort air conditioning system difficulty meets the demands; Especially in the winter time, computer room still needs the normal refrigeration work of air-conditioning unit because of its good airproof performance heat-producing device is many again; At this moment; General comfort air conditioning system is because outdoor condensing pressure is crossed the low operate as normal that has been difficult to, and special air conditioning for device room still can normally guarantee kind of refrigeration cycle work through controlled outdoor condenser.
The air conditioner refrigerating technology belongs to common refrigeration scope, mainly is to adopt liquid vaporizing system cold process, utilizes the liquid gasification will absorb heat, and liquid surface pressure is different, and its boiling point is also different, and pressure is low more, and boiling point is low more.Its operation principle is exactly to make that cold-producing medium compresses in heat power equipments such as compressor, condenser, expansion valve and evaporimeter, heat release, connect the stream and four the main thermal processions of absorbing heat, to accomplish kind of refrigeration cycle.The process of refrigerastion of air-conditioning is a process of heat being moved another environment from an environment.The line voltage of China is 220 volts, 50 hertz, and the air-conditioning of under this condition, working is referred to as " fixed frequency air conditioner ".Because frequency of supply can not change, the compressor rotary speed of traditional fixed frequency air conditioner is constant basically, relies on it constantly " to drive, stop " compressor and adjusts indoor temperature; One of which is opened one and is caused room temperature sometimes hot and sometimes cold easily between stopping; And consume more electric energy, as shown in Figure 1, room temperature changes fluctuation greatly; Be very unfavorable to those sophisticated electronicses like this, influence service life.In traditional air-conditioning control; Pressure of inspiration(Pi) and suction temperature through detection system; Can obtain the degree of superheat of system through the mode of tabling look-up; The aperture of the independent degree of superheat control electric expansion valve that passes through system can make the control of system overheat degree relatively lag behind, and is difficult to make the degree of superheat to be stabilized near the set goal value.
Summary of the invention
The technical problem that the present invention will solve is; Regulating temperature to the fixed frequency air conditioner of prior art causes room temperature sometimes hot and sometimes cold easily; And consume more electric energy; And relying on separately the aperture of degree of superheat control electric expansion valve, the defective that the control of the degree of superheat of system is relatively lagged behind provides a kind of air conditioner in machine room control method based on frequency-changeable compressor that overcomes the above problems.
The technical solution adopted for the present invention to solve the technical problems is: a kind of air conditioner in machine room control method based on frequency-changeable compressor is provided, and said air conditioner in machine room comprises frequency-changeable compressor, condenser, electric expansion valve, evaporimeter, said method comprising the steps of:
S1, air conditioner in machine room initialization are carried out rezero operation to electric expansion valve;
S2, unlatching evaporimeter are according to the blower fan wind speed of pressure of inspiration(Pi) Ps adjustment evaporimeter;
S3, unlatching frequency-changeable compressor, per interval t is according to indoor temperature T
0With preset temperature T
A, the frequency H of adjusting frequency-changeable compressor;
S4, open back elapsed time T2 open cold condenser, and open the atomizing motor simultaneously at frequency-changeable compressor; Per interval T3 is according to pressure at expulsion P
DWith EAT T
DBlower fan wind speed to condenser is controlled;
The aperture Pm of S5, control electric expansion valve adopts the aperture of PI control electric expansion valve, simultaneously, to the change of frequency-changeable compressor frequency, the aperture Pm of electric expansion valve is made corresponding compensation.
In the air conditioner in machine room control method based on frequency-changeable compressor of the present invention, also comprise in the said step 1: temperature sensor, pressure sensor, fault input to said air conditioner in machine room detect, and if any unusually, then make corresponding warning and action.
In the air conditioner in machine room control method based on frequency-changeable compressor of the present invention, said step S2 specifically comprises:
When pressure of inspiration(Pi) Ps was lower than PL1, evaporimeter was opened maximum air output, and promptly the blower fan wind speed of evaporimeter transfers to the most at a high speed;
When pressure of inspiration(Pi) Ps was higher than PL1 and is lower than PL2, every at a distance from the T1 time, evaporimeter increased certain air output, and promptly the blower fan wind speed rising one-level of evaporimeter makes pressure of inspiration(Pi) Ps rise to a rational value;
When pressure of inspiration(Pi) Ps was higher than PL3, the wind speed of evaporimeter switched according to the frequency of frequency-changeable compressor, and every separated T1 time judges that once low frequency is opened low speed, and high frequency is opened at a high speed, and blower fan and FREQUENCY CONTROL are directly proportional;
Said PL1＜PL2＜PL3, T1 are Preset Times.
In the air conditioner in machine room control method based on frequency-changeable compressor of the present invention, said step S3 specifically comprises: frequency-changeable compressor can carry out frequency H and regulate after operation a period of time under the CF H1, and the frequency H of frequency-changeable compressor calculates as follows:
H＝H1+Kp*Error+Ki*I(Error)，
H1 is a CF, and Kp is a proportionality coefficient, and ki is an integration time constant, and Error is indoor temperature T
0With preset temperature T
AError amount, I (Error) the is error amount sum of errors of a period of time in the past.
In the air conditioner in machine room control method based on frequency-changeable compressor of the present invention, said step S4 specifically comprises following:
As pressure at expulsion P
DWhen being higher than PH1 or EAT T
DWhen being higher than Temp1, open the high speed condensation fan, otherwise open the low speed condensation fan.
In the air conditioner in machine room control method based on frequency-changeable compressor of the present invention, the Pm specific algorithm of electric expansion valve is following in the said step 5:
Pm＝E1+Kp*Error+Ki*I(Error)+Kx*(ΔCompressorHz)
Wherein, E1=600 is the aperture of electronic expansion valve controls, and Kp is a proportionality coefficient; Ki is an integration time constant; Error is the error amount of twice degree of superheat in front and back, I (Error) is the degree of superheat error amount sum of errors of a period of time in the past, and Δ CompressorHz is a frequency-changeable compressor frequency-splitting in twice control; Kx* (Δ CompressorHz) is the correction that electronic expansion valve opening changes compressor frequency, and Kp*Error+Ki*I (Error) carries out the principal function of PI control for electric expansion valve.
The air conditioner in machine room control method based on frequency-changeable compressor of embodiment of the present invention; Has following beneficial effect: according to the frequency of indoor temperature and preset temperature adjusting frequency-changeable compressor; Regulate the rotating speed of frequency-changeable compressor; Rely on the speed of frequency-changeable compressor rotating speed to reach the purpose of controlling room temperature, the room temperature fluctuation is little, power consumption is few, and comfort level improves greatly; To the change of compressor frequency, the aperture of electric expansion valve is made corresponding compensation simultaneously, the degree of superheat is stabilized in is provided with a little, improve the refrigerating efficiency COP of air conditioner in machine room.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is existing fixed air conditioner in machine room temperature profile frequently;
Fig. 2 is the structure chart based on the air conditioner in machine room of frequency-changeable compressor of the embodiment of the invention;
Fig. 3 is the air conditioner in machine room control method flow chart based on frequency-changeable compressor of the embodiment of the invention;
Fig. 4 is the indoor temperature curve map based on the air conditioner in machine room control method of frequency-changeable compressor of the embodiment of the invention;
Fig. 5 is the degree of superheat curve map based on the air conditioner in machine room control method of frequency-changeable compressor of the embodiment of the invention.
The specific embodiment
In order to make the object of the invention clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 2; Use the air conditioner in machine room of the air conditioner in machine room control method based on frequency-changeable compressor of the present invention to comprise: frequency-changeable compressor 1, condenser 2, electric expansion valve 3, evaporimeter 4, form one " compression, condensation, expansion step-down, heat absorption evaporation " refrigeration system of circulation repeatedly, in air conditioner in machine room, adopt frequency-changeable compressor 1; Through changing the frequency of supply of compressor 1 frequently; Regulate frequency-changeable compressor 1 rotating speed,, rely on the speed of frequency-changeable compressor 1 rotating speed to reach the purpose of controlling room temperature; The room temperature fluctuation is little, power consumption is few, and its comfort level improves greatly.Evaporimeter 4 is provided with inspiratory pressure sensor, is used to measure the pressure of inspiration(Pi) Ps of evaporimeter 4; On evaporimeter 4, also be provided with the suction temperature sensor, be used to measure the suction temperature Ts of evaporimeter 4.Condenser 2 is provided with back pressure transducer, is used to measure the pressure at expulsion Pd of condenser 2, also is provided with the EAT sensor on the condenser 2, is used to measure the EAT Td of condenser 2.
As shown in Figure 3, the air conditioner in machine room control method flow chart based on frequency-changeable compressor of the embodiment of the invention may further comprise the steps:
S1, air conditioner in machine room initialization are carried out rezero operation to electric expansion valve 3.
Initialized process mainly is that electric expansion valve is carried out rezero operation, the position deviation of generation that rezero operation can be eliminated electric expansion valve 3 because stepper motor lacks the step, and the aperture control of later electric expansion valve 3 is to be adjusted to concrete aperture Pm this zero point.Also the miscellaneous part of air conditioner in machine room such as temperature sensor, pressure sensor, fault input etc. are detected in the initialization,, then make corresponding warning and action if any unusually.Pm is the concrete aperture of electric expansion valve 3 controls.
S2, unlatching evaporator fan 4 are according to the blower fan wind speed of pressure of inspiration(Pi) Ps adjustment evaporimeter 3.The concrete control of evaporimeter is following: when evaporimeter pressure of inspiration(Pi) value Ps was lower than PL1, evaporimeter 3 was opened maximum air output, and promptly the blower fan wind speed of evaporimeter 3 transfers to the most at a high speed; When evaporimeter 3 pressure of inspiration(Pi) value Ps were higher than PL1 and are lower than PL2, then evaporimeter 3 was every at a distance from the T1 times, increases the blower fan air output of certain evaporimeter 3, and promptly the blower fan wind speed rising one-level of evaporimeter 3 makes evaporimeter 3 pressures of inspiration(Pi) rise to a rational value; When evaporimeter 3 pressure of inspiration(Pi) Ps are higher than PL3; The blower fan wind speed of evaporimeter 3 switches according to the frequency of frequency-changeable compressor 1, and every separated T1 time judges that once low frequency is opened low speed; High frequency is opened at a high speed; Wind speed and FREQUENCY CONTROL are directly proportional, and it is low excessively to reach the device leaving air temp that avoids evaporating, and realize the control requirement of the little enthalpy difference of the big air quantity of air conditioner in machine room.In the present embodiment, PL1=0.6MP, PL2=0.7MP, PL3=0.8MP T1=30S.
S3, unlatching frequency-changeable compressor 1, per interval t is according to indoor temperature T
0With preset temperature T
A, the frequency H of adjusting frequency-changeable compressor 1, preset temperature T
AIt is the temperature that hope that the user is provided with as required is adjusted to.Through temperature T in the temperature sensor device measuring chamber
0, preset temperature T
AThe temperature that the hope that is provided with as required for the user is adjusted to.When frequency-changeable compressor 1 is opened, must after operation a period of time under the specific frequency H1, can carry out frequency adjustment control,, in the present embodiment, adopt H1=57HZ to reach the effect of protection frequency-changeable compressor 1.The frequency adjustment of frequency-changeable compressor 1 is specific as follows:
According to indoor temperature T
0With preset temperature T
A, per interval t (2S) regulates frequency-changeable compressor 1 frequency, as indoor temperature T
0Greater than preset temperature T
AThe time, the frequency H of frequency-changeable compressor 1 rises; As indoor temperature T
0Less than preset temperature T
AThe time, the frequency H of frequency-changeable compressor 1 descends; As indoor temperature T
0With preset temperature T
AWhen equating, keep the frequency H of frequency-changeable compressor 1 constant.
Can carrying out of the frequency adjustment of frequency-changeable compressor 1 through revising Kp and two parameters of Ki, concrete control algolithm is following:
H＝H1+Kp*Error+Ki*I(Error)
Wherein Kp is a proportionality coefficient, and Ki is an integration time constant; Kp control is current, and an error amount and a negative constant P (expression ratio) multiply each other, then with predetermined value addition; Ki controls in the past, and error amount is the sum of errors of the past period, multiply by a negative constant I then, then with the predetermined value addition.I finds the output result of air conditioner in machine room and the mean error of predetermined value from the mean error value in past; Error is error amount (being the difference of indoor temperature and preset temperature), I (Error) the is error amount sum of errors of a period of time in the past.
The control interval of this algorithm is t, and promptly air conditioner in machine room is every carries out once this algorithm at a distance from t.In the present embodiment, Kp=0.5, Ki=10, t=2s.
Frequency H through adjustment frequency-changeable compressor 1 can make the control temperature constant, reduces the number of times of frequency-changeable compressor 1 start-stop, makes frequency-changeable compressor 1 finally be stabilized in a specific frequency.As shown in Figure 4, the indoor temperature curve map is by finding out indoor temperature T among the figure
0Finally be stabilized near the preset temperature.
S4, open back elapsed time T2 open cold condenser 2, and open the atomizing motor simultaneously at frequency-changeable compressor 1; Per interval T3 is according to pressure at expulsion P
DWith EAT T
DBlower fan wind speed to condenser 2 is controlled.Condenser 2 concrete controls as follows:
After frequency-changeable compressor 1 is opened, every at a distance from the T3 time, according to pressure at expulsion P
DWith condenser 2 EAT T
DBlower fan wind speed to condenser 2 is controlled.As pressure at expulsion P
DBe higher than PH1 or condenser 2 EAT P
DWhen being higher than Temp1, open the high speed condensation fan, otherwise open the low speed condensation fan.In the present embodiment, T2=5S, T3=30S, PH1=3.2MP, Temp1=25 ℃.
The aperture Pm of S5, control electric expansion valve 3 adopts the aperture of PI control (fuzzy control) electric expansion valve 3, simultaneously, to the change of frequency-changeable compressor 1 frequency, the aperture Pm of electric expansion valve 3 is made corresponding compensation.Aperture through control electric expansion valve (EEV) fluctuates the degree of superheat (superheat) near desired value, (degree of superheat obtains through tabling look-up through the pressure of inspiration(Pi) and the suction temperature of gathering air conditioner in machine room) is the important means that improves air conditioner in machine room COP.Because in this air conditioner in machine room, two controls object frequency-changeable compressor 1 frequency and electric expansion valve 3 apertures are all influential to the degree of superheat, so simple control the degrees of superheat with electric expansion valve 3 and be difficult to make near the stable the set goal value of the degree of superheat.Therefore, we adopt the aperture of PI control (fuzzy control) electric expansion valve to super heat value, simultaneously to the change of frequency-changeable compressor 1 frequency, the aperture Pm of electric expansion valve 3 are made corresponding compensation.The aperture Pm control algolithm of electric expansion valve 3 is specially:
Pm＝E1+Kp*Error+Ki*I(Error)+Kx*(ΔCompressorHz)
Wherein: E1=600 is the aperture of electronic expansion valve controls,
Kp is a proportionality coefficient, and ki is an integration time constant; Kp control is current, and an error amount and a negative constant P (expression ratio) multiply each other, then with predetermined value addition; Ki controls in the past, and error amount is the sum of errors of the past period, multiply by a negative constant I then, then with the predetermined value addition.I finds the output result of air conditioner in machine room and the mean error of predetermined value from the mean error value in past; Error is error amount (difference of indoor temperature and preset temperature), I (Error) the is error amount sum of errors of a period of time in the past.
Error is the error amount of twice degree of superheat in front and back; I (Error) is the degree of superheat error amount sum of errors of a period of time in the past; CompressorHz is a compressor frequency difference in twice control; Kx* (Δ CompressorHz) is the correction that the EEV aperture changes compressor frequency; Kp*Error+Ki*I (Error) carries out the principal function of PI control for EEV.In the present embodiment, Kp=0.8, Ki=25, Kx=5.Through this algorithm, obtain degree of superheat curve map as shown in Figure 5, under the common adjusting of electric expansion valve and frequency-changeable compressor, the degree of superheat is stabilized near the set goal value.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. air conditioner in machine room control method based on frequency-changeable compressor, said air conditioner in machine room comprises frequency-changeable compressor (1), condenser (2), electric expansion valve (3), evaporimeter (4), it is characterized in that, said method comprising the steps of:
S1, air conditioner in machine room initialization are carried out rezero operation to electric expansion valve (3);
S2, unlatching evaporimeter (4) are according to the blower fan wind speed of pressure of inspiration(Pi) Ps adjustment evaporimeter (4);
S3, unlatching frequency-changeable compressor (1), per interval t is according to indoor temperature T
0With preset temperature T
A, the frequency H of adjusting frequency-changeable compressor (1);
S4, open back elapsed time T2 open cold condenser (2), and open the atomizing motor simultaneously at frequency-changeable compressor (1); Per interval T3 is according to pressure at expulsion P
DWith EAT T
DBlower fan wind speed to condenser (2) is controlled;
The aperture Pm of S5, control electric expansion valve adopts the aperture of PI control electric expansion valve, simultaneously, to the change of frequency-changeable compressor (1) frequency, the aperture Pm of electric expansion valve (3) is made corresponding compensation.
2. the air conditioner in machine room control method based on frequency-changeable compressor according to claim 1; It is characterized in that; Also comprise in the said step 1: temperature sensor, pressure sensor, fault input to said air conditioner in machine room detect, and if any unusually, then make corresponding warning and action.
3. the air conditioner in machine room control method based on frequency-changeable compressor according to claim 2 is characterized in that said step S2 specifically comprises:
When pressure of inspiration(Pi) Ps was lower than PL1, evaporimeter (4) was opened maximum air output, and promptly the blower fan wind speed of evaporimeter (4) transfers to the most at a high speed;
When pressure of inspiration(Pi) Ps was higher than PL1 and is lower than PL2, every at a distance from the T1 time, evaporimeter (4) increased certain air output, and promptly the blower fan wind speed rising one-level of evaporimeter (4) makes pressure of inspiration(Pi) Ps rise to a rational value;
When pressure of inspiration(Pi) Ps was higher than PL3, the wind speed of evaporimeter (4) switched according to the frequency of frequency-changeable compressor (1), and every separated T1 time judges that once low frequency is opened low speed, and high frequency is opened at a high speed, and wind speed and FREQUENCY CONTROL are directly proportional;
Said PL1＜PL2＜PL3, T1 are Preset Times.
4. the air conditioner in machine room control method based on frequency-changeable compressor according to claim 3; It is characterized in that; Said step S3 specifically comprises: frequency-changeable compressor (1) can carry out frequency H and regulate after operation a period of time under the CF H1, and the frequency H of frequency-changeable compressor calculates as follows:
H＝H1+Kp*Error+Ki*I(Error)，
H1 is a CF, and Kp is a proportionality coefficient, and Ki is an integration time constant, and Error is indoor temperature T
0With preset temperature T
AError amount, I (Error) the is error amount sum of errors of a period of time in the past.
5. the air conditioner in machine room control method based on frequency-changeable compressor according to claim 4 is characterized in that said step S4 specifically comprises following:
As pressure at expulsion P
DWhen being higher than PH1 or EAT T
DWhen being higher than Temp1, open the high speed condensation fan, otherwise open the low speed condensation fan.
6. the air conditioner in machine room control method based on frequency-changeable compressor according to claim 5 is characterized in that, the aperture Pm specific algorithm of electric expansion valve is following in the said step 5:
Pm＝E1+Kp*Error+Ki*I(Error)+Kx*(ΔCompressorHz)
Wherein, E1=600 is the aperture of electronic expansion valve controls, and Kp is a proportionality coefficient; Ki is an integration time constant; Error is the error amount of twice degree of superheat in front and back, I (Error) is the degree of superheat error amount sum of errors of a period of time in the past, and Δ CompressorHz is a frequency-changeable compressor frequency-splitting in twice control; Kx* (Δ CompressorHz) is the correction that electronic expansion valve opening changes compressor frequency, and Kp*Error+Ki*I (Error) carries out the principal function of PI control for electric expansion valve.
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