CN105222441A - Control method and device of refrigeration system - Google Patents
Control method and device of refrigeration system Download PDFInfo
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- CN105222441A CN105222441A CN201510552124.5A CN201510552124A CN105222441A CN 105222441 A CN105222441 A CN 105222441A CN 201510552124 A CN201510552124 A CN 201510552124A CN 105222441 A CN105222441 A CN 105222441A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001704 evaporation Methods 0.000 claims description 8
- 230000005494 condensation Effects 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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Abstract
The invention provides a control method and a control device of a refrigerating system, wherein the method comprises the following steps: judging whether the current exhaust temperature value of the refrigeration system is greater than a first preset temperature value and does not meet protection control conditions; if so, adjusting the opening degree of the electronic expansion valve and/or the operating frequency of the compressor until the difference between the exhaust temperature value and the exhaust temperature target value is smaller than a first preset difference. The invention solves the technical problem that the refrigeration system can not be effectively controlled under the high-temperature working condition in the prior art to cause system failure, and achieves the effect of effectively controlling the refrigeration system under the high-temperature working condition, thereby ensuring that the refrigeration system can reliably and normally operate.
Description
Technical field
The present invention relates to air conditioner controlling technology field, in particular to a kind of control method and device of refrigeration system.
Background technology
At present, for the control of electric expansion valve, the PID closed-loop feedback control method adopted based on detecting delivery temperature, this control method can realize the control to electronic expansion valve opening quickly and accurately more.
But, for small-sized one-to-one R32 refrigeration system as shown in Figure 1, in FIG, this refrigeration system comprises: compressor 101, cross valve 102, outdoor heat exchanger 105, indoor heat exchanger 103, electric expansion valve 104, indoor blower fan 106 and outside blower fan 107, because the delivery temperature of R32 refrigeration system under identical temperature conditions is higher than R410A refrigeration system 10 ~ 20 DEG C.If adopt the temperature-controlled process identical with R410A refrigeration system, so under worst hot case condition, the situation causing due to excessive discharge temperature frequency reducing or even protection shutdown directly occur may be there is.
How to realize the effective control to R32 refrigeration system, to meet the demand of the normal operation of refrigeration system under worst hot case, not yet propose effective solution at present.
Summary of the invention
Embodiments provide a kind of control method of refrigeration system, cannot the technical problem run of normal reliable to solve frequency reducing that in prior art, refrigeration system occurs because of excessive discharge temperature under worst hot case or even shutdown etc., the method comprises:
Judge whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection controlled condition;
If so, then the aperture of electric expansion valve and/or the running frequency of compressor is adjusted, until the difference between outlet air temperature and delivery temperature desired value is less than the first preset difference value.
In one embodiment, judge whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection controlled condition, comprising:
Determine whether current outlet air temperature is greater than described first preset temperature value;
If so, then judge that whether current outlet air temperature is higher than the delivery temperature protection threshold value preset;
If current outlet air temperature higher than described default delivery temperature protection threshold value, does not then determine that current outlet air temperature is discontented with foot protection controlled condition.
In one embodiment, described default temperature protection threshold value comprise following one of at least: frequency raises limit temperature value, frequency reducing temperature value or compressor shutdown temperature value.
In one embodiment, the adjustment aperture of electric expansion valve and/or the running frequency of compressor, until the difference between outlet air temperature and delivery temperature desired value is less than the first preset difference value, comprising:
Increase the aperture of electric expansion valve;
Determine whether increase the indoor load after the aperture of electric expansion valve is more than or equal to indoor load preset value;
If so, then judge the running frequency that compressor is current, whether be less than current outdoor environment temperature and peak frequency corresponding to current indoor load;
If so, then the running frequency of compressor is increased;
Determine whether the difference increased between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is less than the first preset difference value;
If not, then the adjustment aperture of electric expansion valve and/or the running frequency of compressor is continued.
In one embodiment, after the running frequency increasing compressor, said method also comprises:
Judge whether increase the indoor load after the running frequency of compressor is less than indoor load preset value;
If so, then the aperture of electric expansion valve is reduced;
Judge whether reduce the outlet air temperature after the aperture of electric expansion valve is greater than described first preset temperature value;
If so, then the running frequency of compressor is reduced;
Determine whether the difference reduced between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is less than the second preset difference value;
If not, then the running frequency of adjustment compressor is continued.
In one embodiment, described delivery temperature desired value is determined according to following formula:
T
ds_i＝(T
ds_i-1+T
ds_l_i)/2
Wherein, T
ds_irepresent the delivery temperature desired value in i moment, T
ds_l_irepresent the interim delivery temperature desired value in i moment;
T
ds_l＝a
1T
e 2+a
2T
c 2+a
3T
eT
c+a
4T
e+a
5T
c+a
6F
2+a
7F+a
8
Wherein, T represents evaporating temperature, T
cexpression condensation temperature, F represent the running frequency of compressor, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8represent design factor.
The embodiment of the present invention additionally provides a kind of control device of refrigeration system, cannot the technical problem run of normal reliable to solve frequency reducing that in prior art, refrigeration system occurs because of excessive discharge temperature under worst hot case or even shutdown etc., and this device comprises:
Judge module, for judging whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection controlled condition;
Adjusting module; when being greater than the first preset temperature value for the outlet air temperature current in refrigeration system and being discontented with foot protection controlled condition; the adjustment aperture of electric expansion valve and/or the running frequency of compressor, until the difference between outlet air temperature and delivery temperature desired value is less than the first preset difference value.
In one embodiment, described judge module comprises:
First determining unit, for determining whether current outlet air temperature is greater than described first preset temperature value;
Second determining unit, for when current outlet air temperature is greater than described first preset temperature value, judges that whether current outlet air temperature is higher than the delivery temperature protection threshold value preset;
3rd determining unit, for when current outlet air temperature is not higher than described default delivery temperature protection threshold value, determines that current outlet air temperature is discontented with foot protection controlled condition.
In one embodiment, described adjusting module comprises:
Aperture increases unit, for increasing the aperture of electric expansion valve;
4th determining unit, for determining whether increase the indoor load after the aperture of electric expansion valve is more than or equal to indoor load preset value;
5th determining unit, for when determining that increasing the indoor load after the aperture of electric expansion valve is more than or equal to indoor load preset value, judge the running frequency that compressor is current, whether be less than current outdoor environment temperature and peak frequency corresponding to current indoor load;
Frequency increases unit, for increasing the running frequency of compressor;
6th determining unit, for determining whether the difference increased between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is less than the first preset difference value;
Adjustment unit, for when determining that the difference increased between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is more than or equal to the first preset difference value, continues the adjustment aperture of electric expansion valve and/or the running frequency of compressor.
In one embodiment, described delivery temperature desired value is determined according to following formula:
T
ds_i＝(T
ds_i-1+T
ds_l_i)/2
Wherein, T
ds_irepresent the delivery temperature desired value in i moment, T
ds_l_irepresent the interim delivery temperature desired value in i moment;
T
ds_l＝a
1T
e 2+a
2T
c 2+a
3T
eT
c+a
4T
e+a
5T
c+a
6F
2+a
7F+a
8
Wherein, T represents evaporating temperature, T
cexpression condensation temperature, F represent the running frequency of compressor, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8represent design factor.
In the above-described embodiments, propose a kind of control method of refrigeration system, when the outlet air temperature that refrigeration system is current exceed setting value do not reach again the condition needing protecting control, in conjunction with outlet air temperature, the aperture of parameter adjustment electric expansion valve and the running frequencies of compressor such as delivery temperature desired value and indoor load, thus solve in prior art and cannot control effectively to refrigeration system and cause the technical problem of the system failure under worst hot case, reach the effective control of refrigeration system under worst hot case, thus ensure that refrigeration system can be reliable, normally run.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the system architecture schematic diagram of the R32 refrigeration system according to the embodiment of the present invention;
Fig. 2 is the control method flow chart of the refrigeration system according to the embodiment of the present invention;
Fig. 3 is the refrigeration system control flow chart according to one embodiment of the present invention;
Fig. 4 is the refrigeration system control flow chart according to another embodiment of the present invention;
Fig. 5 is mechanism's block diagram of the control device of refrigeration system according to the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.At this, exemplary embodiment of the present invention and illustrating for explaining the present invention, but not as a limitation of the invention.
R32 refrigeration system as shown in Figure 1, not only comprise the compressor 101 shown in figure, cross valve 102, outdoor heat exchanger 105, indoor heat exchanger 103, electric expansion valve 104, indoor blower fan 106 and outside blower fan 107, can also comprise: the outdoor environment temperature-sensitive bag (not indicating in figure) on heat exchanger 105 disposed in the outdoor and outdoor heat exchange organ pipe warming thermometer bulb (not indicating in figure), in order to detect outdoor environment temperature and outdoor heat exchange actuator temperature; Indoor environment temperature-sensitive bag (not indicating in figure) on heat exchanger 103 disposed in the interior and indoor heat exchanger temperature-sensitive bag (not indicating in figure), in order to detect indoor environment temperature and indoor heat exchanger temperature; Be arranged on the compressor exhaust temperature temperature-sensitive bag (not indicating in figure) of compressor air-discharging side, in order to detect the delivery temperature of compressor 101.
The circulation of this refrigeration system is as follows: the refrigerant superheat gas (i.e. the exhaust of compressor) of the HTHP of being discharged by compressor 101 through cross valve 102 laggard enter outdoor heat exchanger 105, heat release in outdoor heat exchanger 105, the cold-producing medium subcooled liquid of HTHP, then through electric expansion valve 104 reducing pressure by regulating flow, the cold-producing medium two-phase mixture becoming low-temp low-pressure enters indoor heat exchanger 103, heat absorption evaporation in indoor heat exchanger 103, become the refrigerant superheat gas of low-temp low-pressure, then enter in compressor 101 through cross valve 102 and compress, become the refrigerant superheat gas of HTHP, thus complete a circulation.
In this example, provide a kind of control method of refrigeration system, as shown in Figure 2, the method comprises the following steps:
Step 201: judge whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection controlled condition;
Such as, can judge whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection controlled condition in such a way: determine whether current outlet air temperature is greater than described first preset temperature value; If so, then judge that whether current outlet air temperature is higher than the delivery temperature protection threshold value preset; If current outlet air temperature higher than described default delivery temperature protection threshold value, does not then determine that current outlet air temperature is discontented with foot protection controlled condition.Wherein, above-mentioned default delivery temperature protection threshold value can be, but not limited to comprise: frequency raises limit temperature value, frequency reducing temperature value or compressor shutdown temperature value etc.
For example, this deterministic process can comprise:
Relatively delivery temperature T
diswith preset value T
1size, if T
dis>T
1, then enter next step and judge, otherwise perform conventional control;
Relatively delivery temperature T
diswith preset value T
2, T
3, T
4size, if, T
dis>T
2or T
dis>T
3, or T
dis>T
4, then perform exhaust protecting control, otherwise perform the rate-determining steps that follow-up example provide, wherein, T
2represent that frequency raises limit temperature, T
3represent frequency reducing temperature, T
4represent compressor shutdown temperature, and meet T
2<T
3<T
4, wherein, T
2value can be>=100.
Further, consider in the process realized in reality, T
2<T
3<T
4, T
2be minimum in three preset values, therefore, only need to judge whether delivery temperature is greater than T
2, because only otherwise higher than T
2, so delivery temperature is not necessarily higher than T
3and T
4.
Step 202: if then adjust the aperture of electric expansion valve and/or the running frequency of compressor, until the difference between outlet air temperature and delivery temperature desired value is less than the first preset difference value.
Alternatively, when adjusting the running frequency of the aperture of electric expansion valve and/or compressor, it can be mainly the aperture by increasing or reduce electric expansion valve, or the running frequency increasing minimizing compressor adjusts, this process can be a process moved in circles, namely continue to carry out measuring and adjustation, to ensure that, in the process of refrigeration system operation, the difference that can level off between outlet air temperature and delivery temperature desired value is less than the first preset difference value.
Particularly, the aperture of electric expansion valve and/or the running frequency of compressor can be adjusted in such a way, until the difference between outlet air temperature and delivery temperature desired value is less than the first preset difference value, can comprise:
S11: the aperture increasing electric expansion valve;
S12: determine whether increase the indoor load after the aperture of electric expansion valve is more than or equal to indoor load preset value;
Whether S13: if then judge the running frequency that compressor is current, be less than current outdoor environment temperature and peak frequency corresponding to current indoor load;
S14: if then increase the running frequency of compressor;
S15: determine whether the difference increased between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is less than the first preset difference value;
Wherein, delivery temperature desired value can be determined according to following formula:
T
ds_i＝(T
ds_i-1+T
ds_l_i)/2
Wherein, T
ds_irepresent the delivery temperature desired value in i moment, T
ds_l_irepresent the interim delivery temperature desired value in i moment;
T
ds_l＝a
1T
e 2+a
2T
c 2+a
3T
eT
c+a
4T
e+a
5T
c+a
6F
2+a
7F+a
8
Wherein, T represents evaporating temperature, T
cexpression condensation temperature, F represent the running frequency of compressor, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8represent design factor, and these calculate following can be different along with the difference of compressor and system.
S16: if not, then continue the adjustment aperture of electric expansion valve and/or the running frequency of compressor.
After above-mentioned S14, can also comprise:
S17: judge that whether increase the indoor load after the running frequency of compressor is less than indoor load preset value, if so, then reduces the aperture of electric expansion valve;
S18: judge that whether reduce the outlet air temperature after the aperture of electric expansion valve is greater than described first preset temperature value, if so, then reduces the running frequency of compressor;
S19: determine whether the difference reduced between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is less than the second preset difference value;
S20: if not, then continue the running frequency of adjustment compressor.
Namely, the adjustment process of the aperture of electric expansion valve and the running frequency of compressor is all a process progressively adjusted, not an adjustment process settled at one go, need in increase, reduce and adjust step by step and improve, until meet the requirement that system normally runs in judging.
Book is described below in conjunction with two the concrete control methods of embodiment to above-mentioned refrigeration system, in these two detailed description of the invention, the general principle adopted does not depart from above-mentioned total inventive concept, difference is also just that the time point of various judgement is different, but total process direction is identical.
Embodiment 1
With reference to a kind of schematic flow sheet that figure 3 is the control method of refrigeration system, as shown in Figure 3, comprise the following steps:
S1: compare delivery temperature T
diswith preset value T
1size, if T
dis>T
1, then enter S2, otherwise perform the conventional control of S5;
Wherein, T
1can be more than or equal to>=95;
S2: compare delivery temperature T
diswith preset value T
2, T
3, T
4size, if T
dis>T
2or T
dis>T
3or T
dis>T
4, then perform the exhaust protecting control step of S6, otherwise perform step S301;
T
2represent that frequency raises limit temperature, T
3represent frequency reducing temperature, T
4represent compressor shutdown temperature, and meet T
2<T
3<T
4, wherein, T
2value can be>=100.
S301: electronic expansion valve opening increases Δ P on existing aperture basis, wherein, Δ P can be a preset value, and wherein this preset value can be calculated by parameters such as association outdoor environment temperature, compressor exhaust temperature, compressor operating frequency and preset values.
S302: judge delivery temperature T
diswhether be less than T
5, if so, then perform step S303, otherwise return execution step S301, wherein, T
5can value be 95;
S303: judge current indoor load Δ T and preset value Δ T
isize, if Δ T>=Δ T
i, then enter step S304, otherwise enter step S401;
Wherein, Δ T=T
in-T
if, i.e. the difference of indoor environment temperature and design temperature, preset value Δ T
i>=3;
S304: judge whether ongoing frequency F is less than current outdoor environment temperature T
0the peak frequency corresponding with indoor load Δ T, is enter step S305, otherwise enters step S308;
S305: compressor frequency increases Δ F on ongoing frequency basis, wherein, Δ F is also a preset value;
S306: compare | T
dis-T
ds| with preset value T
6size, if | T
dis-T
ds|>=T
6, then enter step S308, otherwise enter step S307, wherein, T
6>=10, and:
Delivery temperature desired value can be determined according to following formula:
T
ds_i＝(T
ds_i-1+T
ds_l_i)/2
Wherein, T
ds_irepresent the delivery temperature desired value in i moment, T
ds_l_irepresent the interim delivery temperature desired value in i moment;
T
ds_l＝a
1T
e 2+a
2T
c 2+a
3T
eT
c+a
4T
e+a
5T
c+a
6F
2+a
7F+a
8
Wherein, T represents evaporating temperature, T
cexpression condensation temperature, F represent the running frequency of compressor, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8represent design factor, and these calculate following can be different along with the difference of compressor and system.
S307: compare delivery temperature T
diswith preset value T
1size, if T
dis>T
1, then return step S301, otherwise return step S304;
S308: keep current operation frequency;
S309: judge current indoor load Δ T and preset value Δ T
isize, if Δ T>=Δ T
i, then return step S308, otherwise perform step S401;
S401: electronic expansion valve opening reduces Δ P on existing aperture basis, wherein, Δ P can be a preset value;
S402: compare delivery temperature T
diswith preset value T
1size, if T
dis>T
1, then enter step S403, otherwise return step S401;
S403: compressor frequency reduces Δ F on ongoing frequency basis;
S404: compare delivery temperature T
diswith preset value T
1size, if T
dis<T
1, then enter step S405, otherwise return execution step S403;
S405: compare | T
dis-T
ds| with preset value T
7size, if | T
dis-T
ds|≤T
7, then return step S5, otherwise enter step S406, wherein, T
7≤ 5;
S406: judge current indoor load Δ T and preset value Δ T
i+1size, if Δ T>=Δ T
i+1, then enter step S407, otherwise return step S401, wherein, Δ T
i>=Δ T
i+1;
S407: judge whether ongoing frequency F is greater than current outdoor environment temperature T
0peak frequency F corresponding to indoor load Δ T
max, if so, then return step S401, otherwise, enter step S408;
S408: keep current operation frequency and aperture;
S409: judge current indoor load Δ T and preset value Δ T
i+1size, if Δ T>=Δ T
i+1, then enter step S410, otherwise return execution step S401;
S410: judge current indoor load Δ T and preset value Δ T
isize, if Δ T>=Δ T
i, then return step S304, otherwise return step S408.
Embodiment 2
With reference to the another kind of schematic flow sheet that figure 4 is the control method of refrigeration system, as shown in Figure 4, comprise the following steps:
S1: compare delivery temperature T
diswith preset value T
1size, if T
dis>T
1, then enter S2, otherwise perform the conventional control of S5;
Wherein, T
1can be more than or equal to>=95;
S2: compare delivery temperature T
diswith preset value T
2, T
3, T
4size, if T
dis>T
2or T
dis>T
3or T
dis>T
4, then perform the exhaust protecting control step of S6, otherwise perform step S301;
T
2represent that frequency raises limit temperature, T
3represent frequency reducing temperature, T
4represent compressor shutdown temperature, and meet T
2<T
3<T
4, wherein, T
2value can be>=100.
S301: electronic expansion valve opening increases Δ P on existing aperture basis, wherein, Δ P can be a preset value, and wherein this preset value can be calculated by parameters such as association outdoor environment temperature, compressor exhaust temperature, compressor operating frequency and preset values.
S302: judge delivery temperature T
diswhether be less than T
5, if so, then perform step S303, otherwise return execution step S301, wherein, T
5can value be 95;
S303: judge current indoor load Δ T and preset value Δ T
isize, if Δ T>=Δ T
i, then enter step S304, otherwise enter step S401;
Wherein, Δ T=T
in-T
if, i.e. the difference of indoor environment temperature and design temperature;
S304: judge whether ongoing frequency F is less than current outdoor environment temperature T
0the peak frequency F corresponding with indoor load Δ T
max, be enter step S305, otherwise enter step S312;
S305: compressor frequency increases Δ F on ongoing frequency basis, wherein, Δ F is also a preset value;
S306: compare delivery temperature T
diswith preset value T
1size, if T
dis>T
1, return step S301, otherwise enter step S307;
S307: compare | T
dis-T
ds| with preset value T
6size, if | T
dis-T
ds|>=T
6, then enter step S308, otherwise enter step S315, wherein, T
6>=10;
S308: electronic expansion valve opening reduces Δ P on existing aperture basis, wherein, Δ P can be a preset value;
S309: compare | T
dis-T
ds| with preset value T
6size, if | T
dis-T
ds|>=T
6, then return step S308, otherwise enter step S310;
S310: compare delivery temperature T
diswith preset value T
1size, if T
dis>T
1, enter step S311, otherwise enter step S317;
S312: compressor operating is at outdoor environment temperature T
0, indoor load Δ T and T
0the peak frequency F corresponding with Δ T
max
S313: compare delivery temperature T
diswith preset value T
1size, if T
dis>T
1, then enter step S2, otherwise enter step S314;
S314: judge current indoor load Δ T and preset value Δ T
isize, if Δ T>=Δ T
i, then return step S312, otherwise enter step S401;
S315: keep the running frequency that compressor is current;
S316: compare delivery temperature T
diswith preset value T
1size, if T
dis>T
1, then enter step S2, otherwise enter step S317;
S317: judge current indoor load Δ T and preset value Δ T
isize, if Δ T>=Δ T
i, then return step S315, otherwise enter step S401;
S401: compressor frequency reduces Δ F on the basis of current operation frequency, Δ F are a preset value;
S402: compare delivery temperature T
diswith preset value T
5size, if T
dis<T
5, then enter step S403, otherwise return step S401;
S403: electronic expansion valve opening reduces Δ P on existing aperture basis, wherein, Δ P can be a preset value;
S404: compare delivery temperature T
diswith preset value T
5size, if T
dis>T
5, enter step S405, otherwise return step S403;
S405: compare | T
dis-T
ds| with preset value T
7size, if | T
dis-T
ds|≤T
7, then enter the conventional control of step S5, otherwise return step S401, wherein, T
7≤ 5.
In the above-described embodiment; when delivery temperature higher than preset value and discontented foot protection controlled condition time; electronic expansion valve opening increases on existing aperture basis; when performing electronic expansion valve opening and opening large; by judge the difference of compressor exhaust temperature and target exhaust temperature determine whether to open further large or time reduce compressor exhaust temperature by frequency reducing; prevent compressor air suction mass dryness fraction too low with this, thus guarantee the reliability of compressor.Wherein, the adjustment of compressor operating frequency can be judged by indoor load size;
Further, can be calculated by parameters such as association outdoor environment temperature, compressor exhaust temperature, compressor operating frequency and preset values the adjustment amount of electronic expansion valve opening, above-mentioned target exhaust temperature can be calculated by association indoor heat exchanger temperature, outdoor heat exchange actuator temperature, compressor operating frequency etc., and frequency adjustment can be calculated by parameters such as the maximum permission running frequencies of association outdoor environment temperature, indoor load and compressor.
When indoor load reduces, can by reducing electronic expansion valve opening and reducing the delivery temperature that compressor operating frequency reduces compressor, and determine whether to perform conventional control by the difference judging compressor exhaust temperature and target exhaust temperature.
But it should be noted that in above-mentioned two embodiments it is only provide two instantiations so that the present invention to be described, the step that the inside is concrete and decision logic can adjust with actual conditions as required, and the application is not construed as limiting this.
Based on same inventive concept, in the embodiment of the present invention, additionally provide a kind of control of refrigeration system. device, as described in the following examples.Due to the control of refrigeration system. the principle that device is dealt with problems is similar to the control method of refrigeration system, and therefore the enforcement of the control device of refrigeration system see the enforcement of the control method of refrigeration system, can repeat part and repeat no more.Following used, term " unit " or " module " can realize the software of predetermined function and/or the combination of hardware.Although the device described by following examples preferably realizes with software, hardware, or the realization of the combination of software and hardware also may and conceived.Fig. 5 is a kind of structured flowchart of the control device of the refrigeration system of the embodiment of the present invention, as shown in Figure 5, can comprise: judge module 501 and adjusting module 502, be described this structure below.
Judge module 501, for judging whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection controlled condition;
Adjusting module 502; when being greater than the first preset temperature value for the outlet air temperature current in refrigeration system and being discontented with foot protection controlled condition; the adjustment aperture of electric expansion valve and/or the running frequency of compressor, until the difference between outlet air temperature and delivery temperature desired value is less than the first preset difference value.
In one embodiment, judge module 501 can comprise: the first determining unit, for determining whether current outlet air temperature is greater than described first preset temperature value; Second determining unit, for when current outlet air temperature is greater than described first preset temperature value, judges that whether current outlet air temperature is higher than the delivery temperature protection threshold value preset; 3rd determining unit, for when current outlet air temperature is not higher than described default delivery temperature protection threshold value, determines that current outlet air temperature is discontented with foot protection controlled condition.
In one embodiment, adjusting module 502 comprises: aperture increases unit, for increasing the aperture of electric expansion valve; 4th determining unit, for determining whether increase the indoor load after the aperture of electric expansion valve is more than or equal to indoor load preset value; 5th determining unit, for when determining that increasing the indoor load after the aperture of electric expansion valve is more than or equal to indoor load preset value, judge the running frequency that compressor is current, whether be less than current outdoor environment temperature and peak frequency corresponding to current indoor load; Frequency increases unit, for increasing the running frequency of compressor; 6th determining unit, for determining whether the difference increased between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is less than the first preset difference value; Adjustment unit, for when determining that the difference increased between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is more than or equal to the first preset difference value, continues the adjustment aperture of electric expansion valve and/or the running frequency of compressor.
In one embodiment, delivery temperature desired value is determined according to following formula:
T
ds_i＝(T
ds_i-1+T
ds_l_i)/2
Wherein, T
ds_irepresent the delivery temperature desired value in i moment, T
ds_l_irepresent the interim delivery temperature desired value in i moment;
T
ds_l＝a
1T
e 2+a
2T
c 2+a
3T
eT
c+a
4T
e+a
5T
c+a
6F
2+a
7F+a
8
Wherein, T represents evaporating temperature, T
cexpression condensation temperature, F represent the running frequency of compressor, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8represent design factor.
From above description, can find out, the embodiment of the present invention achieves following technique effect: the control method proposing a kind of refrigeration system, when the outlet air temperature that refrigeration system is current exceed setting value do not reach again the condition needing protecting control, in conjunction with outlet air temperature, the aperture of parameter adjustment electric expansion valve and the running frequencies of compressor such as delivery temperature desired value and indoor load, thus solve in prior art and cannot control effectively to refrigeration system and cause the technical problem of the system failure under worst hot case, reach the effective control of refrigeration system under worst hot case, thus ensure that refrigeration system can be reliable, normally run.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned embodiment of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the embodiment of the present invention is not restricted to any specific hardware and software combination.
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 embodiment of the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a control method for refrigeration system, comprising:
Judge whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection controlled condition;
If so, then the aperture of electric expansion valve and/or the running frequency of compressor is adjusted, until the difference between outlet air temperature and delivery temperature desired value is less than the first preset difference value.
2. method according to claim 1, is characterized in that, judges whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection controlled condition, comprising:
Determine whether current outlet air temperature is greater than described first preset temperature value;
If so, then judge that whether current outlet air temperature is higher than the delivery temperature protection threshold value preset;
If current outlet air temperature higher than described default temperature protection threshold value, does not then determine that current outlet air temperature is discontented with foot protection controlled condition.
3. method according to claim 2, is characterized in that, described default temperature protection threshold value comprise following one of at least: frequency raises limit temperature value, frequency reducing temperature value or compressor shutdown temperature value.
4. method according to claim 1, is characterized in that, the adjustment aperture of electric expansion valve and/or the running frequency of compressor, until the difference between outlet air temperature and delivery temperature desired value is less than the first preset difference value, comprising:
Increase the aperture of electric expansion valve;
Determine whether increase the indoor load after the aperture of electric expansion valve is more than or equal to indoor load preset value;
If so, then judge the running frequency that compressor is current, whether be less than current outdoor environment temperature and peak frequency corresponding to current indoor load;
If so, then the running frequency of compressor is increased;
Determine whether the difference increased between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is less than the first preset difference value;
If not, then the adjustment aperture of electric expansion valve and/or the running frequency of compressor is continued.
5. method according to claim 4, is characterized in that, after the running frequency increasing compressor, described method also comprises:
Judge whether increase the indoor load after the running frequency of compressor is less than indoor load preset value;
If so, then the aperture of electric expansion valve is reduced;
Judge whether reduce the outlet air temperature after the aperture of electric expansion valve is greater than described first preset temperature value;
If so, then the running frequency of compressor is reduced;
Determine whether the difference reduced between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is less than the second preset difference value;
If not, then the running frequency of adjustment compressor is continued.
6. method according to any one of claim 1 to 5, is characterized in that, determines described delivery temperature desired value according to following formula:
T
ds_i＝(T
ds_i-1+T
ds_l_i)/2
Wherein, T
ds_irepresent the delivery temperature desired value in i moment, T
ds_l_irepresent the interim delivery temperature desired value in i moment;
T
ds_l＝a
1T
e 2+a
2T
c 2+a
3T
eT
c+a
4T
e+a
5T
c+a
6F
2+a
7F+a
8
Wherein, T represents evaporating temperature, T
cexpression condensation temperature, F represent the running frequency of compressor, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8represent design factor.
7. a control device for refrigeration system, comprising:
Judge module, for judging whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection controlled condition;
Adjusting module; when being greater than the first preset temperature value for the outlet air temperature current in refrigeration system and being discontented with foot protection controlled condition; the adjustment aperture of electric expansion valve and/or the running frequency of compressor, until the difference between outlet air temperature and delivery temperature desired value is less than the first preset difference value.
8. device according to claim 7, is characterized in that, described judge module comprises:
First determining unit, for determining whether current outlet air temperature is greater than described first preset temperature value;
Second determining unit, for when current outlet air temperature is greater than described first preset temperature value, judges that whether current outlet air temperature is higher than the delivery temperature protection threshold value preset;
3rd determining unit, for when current outlet air temperature is not higher than described default delivery temperature protection threshold value, determines that current outlet air temperature is discontented with foot protection controlled condition.
9. device according to claim 7, is characterized in that, described adjusting module comprises:
Aperture increases unit, for increasing the aperture of electric expansion valve;
4th determining unit, for determining whether increase the indoor load after the aperture of electric expansion valve is more than or equal to indoor load preset value;
5th determining unit, for when determining that increasing the indoor load after the aperture of electric expansion valve is more than or equal to indoor load preset value, judge the running frequency that compressor is current, whether be less than current outdoor environment temperature and peak frequency corresponding to current indoor load;
Frequency increases unit, for increasing the running frequency of compressor;
6th determining unit, for determining whether the difference increased between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is less than the first preset difference value;
Adjustment unit, for when determining that the difference increased between the outlet air temperature after the running frequency of compressor and delivery temperature desired value is more than or equal to the first preset difference value, continues the adjustment aperture of electric expansion valve and/or the running frequency of compressor.
10. the device according to any one of claim 7 to 9, is characterized in that, described delivery temperature desired value is determined according to following formula:
T
ds_i＝(T
ds_i-1+T
ds_l_i)/2
Wherein, T
ds_irepresent the delivery temperature desired value in i moment, T
ds_l_irepresent the interim delivery temperature desired value in i moment;
T
ds_l＝a
1T
e 2+a
2T
c 2+a
3T
eT
c+a
4T
e+a
5T
c+a
6F
2+a
7F+a
8
Wherein, T represents evaporating temperature, T
cexpression condensation temperature, F represent the running frequency of compressor, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8represent design factor.
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|---|---|---|---|
| CN201510552124.5A CN105222441B (en) | 2015-09-01 | 2015-09-01 | Control method and device of refrigeration system |
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|---|---|---|---|
| CN201510552124.5A CN105222441B (en) | 2015-09-01 | 2015-09-01 | Control method and device of refrigeration system |
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