CN105276882A - Exhaust gas temperature control method for condensing unit - Google Patents
Exhaust gas temperature control method for condensing unit Download PDFInfo
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- CN105276882A CN105276882A CN201510672808.9A CN201510672808A CN105276882A CN 105276882 A CN105276882 A CN 105276882A CN 201510672808 A CN201510672808 A CN 201510672808A CN 105276882 A CN105276882 A CN 105276882A
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- condensation unit
- delivery temperature
- control method
- temperature control
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Abstract
The invention discloses an exhaust gas temperature control method for a condensing unit. The exhaust gas temperature control method for the condensing unit comprises the steps that the exhaust gas temperature of the condensing unit is detected, and when the exhaust gas temperature T is larger than To_OFF-A DEG C, the frequency of a compressor is adjusted until the exhaust gas temperature T is smaller than or equal to To_OFF-B DEG C; and A is smaller than B, To_OFF is the exhaust gas temperature protection value of a system, and the exhaust gas temperature T is the exhaust gas temperature. According to the exhaust gas temperature control method for the condensing unit, the exhaust gas temperature of the condensing unit can be controlled at an ideal value, and meanwhile it is ensured that the energy efficiency of the condensing unit is at a high value.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of condensation unit delivery temperature control method.
Background technology
Cryogenic condensation unit evaporating temperature is in the market minimum is generally all about-40 DEG C, and because evaporating pressure is too low, the compression ratio of system is higher, causes delivery temperature very high, influential system reliability of operation.Many producers, in order to control system delivery temperature, take the mode of Liquid injection cooling.Liquid refrigerant directly sprays into compressor air suction room can reduce compressor air suction specific enthalpy, reduces inspiratory volume, thus reaches the object reducing delivery temperature, but Liquid injection cooling can reduce the mass flow of system refrigerant simultaneously, reduces the efficiency of system.
Summary of the invention
A kind of condensation unit delivery temperature control method is provided in the embodiment of the present invention, the delivery temperature of condensation unit can be controlled an ideal value, ensure that the efficiency of condensation unit is in a high value simultaneously.
For achieving the above object, the embodiment of the present invention provides a kind of condensation unit delivery temperature control method, comprising: the delivery temperature detecting condensation unit; When T is vented > To_OFF-A DEG C, regulate compressor frequency, until T exhaust≤To_OFF-B DEG C; Wherein A < B, To_OFF are system exhaust temperature protection value, and T exhaust is delivery temperature.
As preferably, according to formula F (n)=F (n-1)-Kx* (T exhaust-To_OFF+A DEG C), compressor frequency is regulated; Wherein F (n) is compressor frequency after regulating for n-th time, and F (n-1) is compressor frequency after regulating for (n-1)th time, and Kx is the proportionality coefficient between temperature and change of frequency.
As preferably, the step detecting the delivery temperature of condensation unit comprises: by the delivery temperature of exhaust temperature-sensitive bag Real-time Obtaining condensation unit.
As preferably, when continuous t1 time detecting is vented > To_OFF-A DEG C to T, just regulate compressor frequency according to formula.
As preferably, when compressor frequency is regulated, every t2 Timing first compression unit frequency.
As preferably, condensation unit delivery temperature control method also comprises: when the compressor frequency value < ongoing frequency value calculated according to room temperature, control compressor frequency according to room temperature; Or when continuous t3 time detecting controls to compressor frequency during T exhaust≤To_OFF-B DEG C according to room temperature.
As preferably, A is 10, B is 15.
As preferably, t1 is 5s.
As preferably, t2 is 5s.
As preferably, t3 is 5s.
Apply technical scheme of the present invention, condensation unit delivery temperature control method comprises: the delivery temperature detecting condensation unit; When T is vented > To_OFF-A DEG C, regulate compressor frequency, until T exhaust≤To_OFF-B DEG C; Wherein A < B, To_OFF are system exhaust temperature protection value, and T exhaust is delivery temperature.By above-mentioned delivery temperature control method, effectively can control the delivery temperature of condensation unit by regulating the mode of compressor frequency, ensure that delivery temperature remains in a zone of reasonableness, effectively can ensure the work efficiency of condensation unit simultaneously.
Accompanying drawing explanation
Fig. 1 is the control principle drawing of the condensation unit delivery temperature control method of the embodiment of the present invention;
Fig. 2 is the control flow chart of the condensation unit delivery temperature control method of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but not as a limitation of the invention.
Shown in Fig. 1 and Fig. 2, according to embodiments of the invention, condensation unit delivery temperature control method comprises: the delivery temperature detecting condensation unit; When T is vented > To_OFF-A DEG C, regulate compressor frequency, until T exhaust≤To_OFF-B DEG C; Wherein A < B, To_OFF are system exhaust temperature protection value, and T exhaust is delivery temperature.To_OFF is herein set to different values according to the difference of compressor.
By above-mentioned delivery temperature control method, can first detect the delivery temperature of condensation unit, then when needing the delivery temperature controlling condensation unit, effectively the delivery temperature of condensation unit is controlled by regulating the mode of compressor frequency, ensure that delivery temperature remains in a zone of reasonableness, effectively can ensure the work efficiency of condensation unit simultaneously.
In the present embodiment, when needing to regulate the frequency of compressor, can regulate compressor frequency according to formula F (n)=F (n-1)-Kx* (T exhaust-To_OFF+A DEG C); Wherein F (n) is compressor frequency after regulating for n-th time, and F (n-1) is compressor frequency after regulating for (n-1)th time, and Kx is the proportionality coefficient between temperature and change of frequency.
By above-mentioned formula, the operating frequency of compressor can be made to regulate according to a certain percentage according to the difference between the delivery temperature detected and safety exhaust temperature, thus make the delivery temperature of unit be stabilized near a comparatively safe value, ensure the reliability of condensation unit work.
Also can be regulated by other modes relevant to delivery temperature the frequency adjustment of compressor, such as, can limit frequency reducing at some delivery temperature point to compressor by various formula.
The step detecting the delivery temperature of condensation unit comprises: by the delivery temperature of exhaust temperature-sensitive bag Real-time Obtaining condensation unit.The detection of condensation unit delivery temperature also can realize by other means.
When condensation unit works, due to the problem that exhaust temperature-sensitive bag self detects, there is the phenomenon of excessive discharge temperature in occasional, and delivery temperature at this moment does not represent the actual exhaust air temperature of condensation unit, therefore, in order to ensure the accuracy that delivery temperature regulates and reliability, in the present embodiment, when continuous t1 time detecting is vented > To_OFF-A DEG C to T, just regulate compressor frequency according to formula.If t1 time detecting is vented > To_OFF-A DEG C to T continuously, then illustrate that delivery temperature is really beyond limiting temperature, needs to adjust delivery temperature.A is herein 10, and certainly, numerical value herein also can regulate according to the actual environment of the region of condensation unit work and locality, only needs to ensure the excessive discharge temperature avoiding condensation unit.T1 is herein such as 5s.
When compressor frequency is regulated, every t2 Timing first compression unit frequency.During owing to regulating compressor frequency at every turn, can not ensure that the inevitable disposable adjustment of compressor frequency puts in place, therefore, every t2 Timing first compression unit frequency in the present embodiment, the continuity that compressor frequency adjusts can be ensured, make compressor frequency can quick adjustment to suitable frequency.T2 is herein such as 5s.Preferably, t1=t2, due to t1 be need compressor frequency need regulate time continuous detection time, t2 is the adjustment interval of compressor frequency.Both are identical, just make each frequency adjustment and frequency detecting realize synchronous, ensure the accuracy of compressor frequency adjustment, improve the efficiency of compressor frequency adjustment.
Condensation unit delivery temperature control method also comprises: when the compressor frequency value < ongoing frequency value that compressor calculates according to room temperature, control compressor frequency according to room temperature; Or when continuous t3 time detecting controls to compressor frequency during T exhaust≤To_OFF-B DEG C according to room temperature.B is herein such as 15.
In order to ensure that room temperature controls in a suitable scope, also need to calculate compressor frequency by pid algorithm according to room temperature, when the compressor frequency calculated according to room temperature is less than the compressor frequency calculated according to the formula in the present embodiment, then run compressor according to the compressor frequency calculated according to room temperature, compressor frequency now owing to calculating according to room temperature is less than the compressor frequency calculated according to the formula in the present embodiment, can ensure that the frequency of compressor operates in lower frequency, avoid excessive discharge temperature, also can ensure to meet storehouse temperature requirement simultaneously.
In addition, when continuous t3 time detecting controls to compressor frequency during T exhaust≤To_OFF-B DEG C according to room temperature, if now continuous t3 time detecting is to T exhaust≤To_OFF-B DEG C, then illustrate that the delivery temperature of condensation unit is a lower value, compressor can be made to control according to pid algorithm, make the work of condensation unit can meet storehouse temperature requirement, because T exhaust is lower, it has been a more satisfactory value, now unit carries out compressor frequency control according to storehouse temperature, the efficiency of condensation unit can be made to be in a high value, to meet storehouse temperature requirement simultaneously.T3 is herein such as 5s.
Certainly, be more than the preferred embodiment of the present invention.It should be pointed out that for those skilled in the art, under the prerequisite not departing from its general principles, can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a condensation unit delivery temperature control method, is characterized in that, comprising:
Detect the delivery temperature of condensation unit;
When T is vented > To_OFF-A DEG C, regulate compressor frequency, until T exhaust≤To_OFF-B DEG C;
Wherein A < B, To_OFF are system exhaust temperature protection value, and T exhaust is delivery temperature.
2. condensation unit delivery temperature control method according to claim 1, is characterized in that, regulates compressor frequency according to formula F (n)=F (n-1)-Kx* (T exhaust-To_OFF+A DEG C);
Wherein F (n) is compressor frequency after regulating for n-th time, and F (n-1) is compressor frequency after regulating for (n-1)th time, and Kx is the proportionality coefficient between temperature and change of frequency.
3. condensation unit delivery temperature control method according to claim 1, is characterized in that, the step of the delivery temperature of described detection condensation unit comprises: by the delivery temperature of exhaust temperature-sensitive bag Real-time Obtaining condensation unit.
4. condensation unit delivery temperature control method according to claim 2, is characterized in that, when continuous t1 time detecting is vented > To_OFF-A DEG C to T, just regulates compressor frequency according to described formula.
5. condensation unit delivery temperature control method according to claim 1, is characterized in that, when compressor frequency is regulated, and every t2 Timing first compression unit frequency.
6. condensation unit delivery temperature control method according to claim 2, is characterized in that, described condensation unit delivery temperature control method also comprises:
When the compressor frequency value < ongoing frequency value calculated according to room temperature, according to room temperature, compressor frequency is controlled; Or
When continuous t3 time detecting controls to compressor frequency during T exhaust≤To_OFF-B DEG C according to room temperature.
7. condensation unit delivery temperature control method according to claim 1, is characterized in that, A is 10, B is 15.
8. condensation unit delivery temperature control method according to claim 4, it is characterized in that, t1 is 5s.
9. condensation unit delivery temperature control method according to claim 5, it is characterized in that, t2 is 5s.
10. condensation unit delivery temperature control method according to claim 6, it is characterized in that, t3 is 5s.
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| CN201510672808.9A CN105276882B (en) | 2015-10-15 | 2015-10-15 | Condense unit delivery temperature control method |
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| CN201510672808.9A CN105276882B (en) | 2015-10-15 | 2015-10-15 | Condense unit delivery temperature control method |
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| CN105276882B CN105276882B (en) | 2017-12-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107036256A (en) * | 2017-05-31 | 2017-08-11 | 广东美的制冷设备有限公司 | The control method of delivery temperature, the control device of delivery temperature and air conditioner |
| CN109458776A (en) * | 2016-10-18 | 2019-03-12 | 珠海格力电器股份有限公司 | Condense unit progress control method, device and the refrigeration equipment with the device |
| CN111380185A (en) * | 2020-03-27 | 2020-07-07 | 广东美的制冷设备有限公司 | Compressor exhaust temperature frequency limiting control method, air conditioner and readable storage medium |
| CN112178978A (en) * | 2020-10-15 | 2021-01-05 | 广东纽恩泰新能源科技发展有限公司 | Protection control method for overhigh exhaust temperature of variable frequency heat pump |
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| KR20090029515A (en) * | 2007-09-18 | 2009-03-23 | 엘지전자 주식회사 | Air-conditioner of the control method |
| CN102230662A (en) * | 2011-06-21 | 2011-11-02 | 宁波奥克斯电气有限公司 | Method for judging fault of direct-current frequency conversion variable refrigerant volume (VRV) air conditioning module |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458776A (en) * | 2016-10-18 | 2019-03-12 | 珠海格力电器股份有限公司 | Condense unit progress control method, device and the refrigeration equipment with the device |
| CN107036256A (en) * | 2017-05-31 | 2017-08-11 | 广东美的制冷设备有限公司 | The control method of delivery temperature, the control device of delivery temperature and air conditioner |
| CN107036256B (en) * | 2017-05-31 | 2019-06-11 | 广东美的制冷设备有限公司 | The control method of delivery temperature, the control device of delivery temperature and air conditioner |
| CN111380185A (en) * | 2020-03-27 | 2020-07-07 | 广东美的制冷设备有限公司 | Compressor exhaust temperature frequency limiting control method, air conditioner and readable storage medium |
| CN112178978A (en) * | 2020-10-15 | 2021-01-05 | 广东纽恩泰新能源科技发展有限公司 | Protection control method for overhigh exhaust temperature of variable frequency heat pump |
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| CN105276882B (en) | 2017-12-08 |
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