CN113685961B - Control method for transitional season refrigeration energy conservation of constant-temperature and constant-humidity air conditioning unit - Google Patents
Control method for transitional season refrigeration energy conservation of constant-temperature and constant-humidity air conditioning unit Download PDFInfo
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- CN113685961B CN113685961B CN202110925210.1A CN202110925210A CN113685961B CN 113685961 B CN113685961 B CN 113685961B CN 202110925210 A CN202110925210 A CN 202110925210A CN 113685961 B CN113685961 B CN 113685961B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a control method for transition season refrigeration energy saving of a constant temperature and humidity air conditioning unit, which aims at the refrigeration operation of the unit, and simultaneously determines the adjustment direction of a compressor by actually measuring the temperature and humidity of outlet air after an inner disc when fresh air is started, calculating the corresponding moisture content of the outlet air, and comparing the moisture content with the moisture content corresponding to indoor set temperature and humidity, thereby effectively avoiding the overload refrigeration dehumidification caused by simply depending on dew point control in the prior art, reducing the energy consumption and reducing the risk of coil pipe freezing in transition seasons. Meanwhile, temperature and humidity control fluctuation caused by overshoot is reduced through judgment of the moisture content change trend, so that temperature and humidity control is smoother and more stable.
Description
Technical Field
The invention relates to a control method of an air conditioner, in particular to a control method of a constant temperature and humidity air conditioning unit, and specifically relates to a control method of transition season refrigeration energy saving of the constant temperature and humidity air conditioning unit.
Background
At present, the constant temperature and humidity air conditioner is widely applied to various industries, and the constant humidity control method is mainly used for controlling the temperature of the inner disc and the dew point temperature corresponding to the set temperature and humidity by comparing, namely, the control target of constant temperature and humidity is achieved by controlling the dew point air supply. However, in the transitional season, only part of fresh air constant-temperature and constant-humidity air conditioning units participate in operation, so that the method has the defect of excessive energy consumption and is not energy-saving. In addition, in the transition season, due to the fact that the load of mixed air is small, the risk that the inner coil pipe is iced due to the fact that the compressor is overloaded can be increased, and the running reliability of the unit is affected.
Therefore, improvements are urgently needed so as to better meet the market demands.
Disclosure of Invention
The invention aims to provide a control method for transitional season refrigeration energy conservation of a constant-temperature and constant-humidity air conditioning unit aiming at the problems encountered when the current constant-temperature and constant-humidity air conditioning unit is used in transitional seasons, so that the increase of energy consumption caused by the overload refrigeration and dehumidification of a compressor can be avoided, the economical efficiency of operation is improved, and meanwhile, the risk of icing of an inner coil pipe can be reduced, and the operation reliability of the unit is improved.
The technical scheme of the invention is as follows:
a control method for transition season refrigeration energy saving of a constant temperature and humidity air conditioning unit is characterized in that an outdoor fresh air port is arranged on an indoor unit of the air conditioning unit; a temperature and humidity sensor is arranged on the indoor heat exchanger and can detect the temperature and humidity of air passing through the indoor heat exchanger; the control method comprises the following steps:
1) starting the unit and operating a refrigeration mode;
2) detecting the air outlet temperature Toi and the relative humidity Hroi of the inner disc behind the indoor heat exchanger at intervals of time t, and calculating the air outlet moisture content Doi of the inner disc; meanwhile, calculating moisture content change trend M, wherein M is the difference value between the sum of Doi in the current T time and the sum of Doi in the previous T time; setting a median value P of the variation trend;
3) if Doi-DS is not less than delta d1, turning to step 4); if Doi-DS is less than or equal to delta d2, turning to the step 5); if delta d2 < Doi-DS < delta d1, turning to step 6); wherein DS is the moisture content corresponding to the set temperature and humidity; delta d1 and delta d2 are set change values, and delta d1 is equal to or more than delta d 2;
4) if M is more than or equal to P, turning to step 6); otherwise, turning to step 8);
5) if M is less than or equal to P, turning to the step 7); otherwise, turning to step 8);
6) loading a fixed-frequency compressor or increasing the frequency of a variable-frequency compressor, and then turning to the step 2);
7) unloading the fixed-frequency compressor or reducing the frequency of the variable-frequency compressor, and then turning to the step 2);
8) the compressor maintains the current output and then goes to step 2).
Further, t is 1 second.
Further, the default of the delta d1 is 1g/kg, and the delta d1 is adjustable within the range of 0.5-3 g/kg; the default of the delta d2 is-1 g/kg, and the delta d2 can be adjusted within the range of-3 to-0.5 g/kg.
Further, the P is 0.6 g/kg.
The invention has the beneficial effects that:
the invention has reasonable design, clear logic and convenient control, and can judge whether the compressor needs to be loaded or unloaded by detecting the temperature and the moisture content of the air behind the inner disc and comparing the detected temperature and the moisture content with the moisture content corresponding to the set temperature and humidity when the constant-temperature and constant-humidity air conditioning unit operates in the transition season for refrigeration, thereby avoiding the overload refrigeration and dehumidification of the compressor in the transition season, reducing the refrigeration and reheating compensation energy consumption, improving the operation economy, reducing the risk of freezing the coil pipe in the transition season and improving the operation reliability of the unit.
Detailed Description
The present invention will be further described with reference to the following examples.
A constant temperature and humidity air conditioning unit comprises an outdoor unit and an indoor unit. The outdoor machine is provided with a refrigerant pipeline consisting of a compressor, a four-way valve, an outdoor heat exchanger and an electronic expansion valve, and the indoor machine is internally provided with an indoor heater and is communicated with the refrigerant pipeline of the outdoor machine through an air pipe and a liquid pipe to form a refrigerant circulation loop. One side of the indoor heat exchanger is provided with an outdoor fresh air inlet and an indoor return air inlet, the other side of the indoor heat exchanger is provided with an indoor air supply outlet, and a fan is arranged at the position of the indoor air supply outlet to promote air flow. An air inlet mixing section can be formed between the outdoor fresh air inlet and the indoor air return inlet as well as between the indoor heat exchangers, so that the input of fresh air is more smooth. The indoor heat exchanger with be equipped with reheater and humidifier between the indoor supply-air outlet, can reheat or the humidification to indoor air supply as required, better satisfying user's demand.
The invention relates to a control method for transition season refrigeration energy saving of a constant temperature and humidity air conditioning unit, which is designed aiming at the constant temperature and humidity air conditioning unit and aims to avoid the increase of energy consumption caused by the excessive loading refrigeration dehumidification of a compressor when the unit operates in transition season refrigeration, and realize energy saving and environmental protection. The control method comprises the following steps:
1) starting the unit and operating a refrigeration mode;
2) detecting the air outlet temperature Toi and the relative humidity Hroi of the inner disc behind the indoor heat exchanger at intervals of time t, and calculating the air outlet moisture content Doi of the inner disc; meanwhile, calculating moisture content change trend M, wherein M is the difference value of the sum of Doi in the current T time and the sum of Doi in the previous T time; setting a median value P of the variation trend; preferably, t is 1 second; the T is 30 seconds; the P is 0.6 g/kg;
3) if Doi-DS is not less than delta d1, turning to step 4); if Doi-DS is less than or equal to delta d2, turning to the step 5); if delta d2 < Doi-DS < delta d1, turning to step 6); wherein DS is the moisture content corresponding to the set temperature and humidity; delta d1 and delta d2 are set change values, and delta d1 is equal to or more than delta d 2; preferably, the default of the delta d1 is 1g/kg, and the delta d1 is adjustable within the range of 0.5-3 g/kg; the default of the delta d2 is-1 g/kg, and the delta d2 is adjustable within the range of-3 to-0.5 g/kg;
4) if M is more than or equal to P, turning to step 6); otherwise, turning to step 8);
5) if M is less than or equal to P, turning to the step 7); otherwise, turning to step 8);
6) loading a fixed-frequency compressor or increasing the frequency of a variable-frequency compressor, and then turning to the step 2);
7) unloading the fixed-frequency compressor or reducing the frequency of the variable-frequency compressor, and then turning to the step 2);
8) the compressor maintains the current output and then goes to step 2).
When the constant temperature and humidity unit related by the invention operates in a refrigerating mode, outdoor fresh air input is started at the same time, so that the moisture content of the unit is easy to fluctuate. According to the control method, the air outlet temperature and humidity after the inner disc is actually measured, the corresponding moisture content is calculated, and then the comparison is carried out with the moisture content corresponding to the indoor set temperature and humidity, so that the adjustment direction of the compressor is determined, the phenomenon that the refrigeration and dehumidification are excessively loaded due to the fact that dew point control is only relied on in the past can be effectively avoided, the energy consumption is reduced, and the risk of freezing the coil pipe in transitional seasons can be reduced. Meanwhile, temperature and humidity control fluctuation caused by overshoot is reduced through judgment of the moisture content change trend, so that temperature and humidity control is smoother and more stable.
The invention can also be applied to the state that the unit operates in a refrigerating way in a transition season but does not start outdoor fresh air.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (4)
1. A control method for transition season refrigeration energy saving of a constant temperature and humidity air conditioning unit is characterized in that an outdoor fresh air port is arranged on an indoor unit of the air conditioning unit; a temperature and humidity sensor is arranged on an indoor heat exchanger of the indoor unit, and can detect the temperature and the humidity of air passing through the indoor heat exchanger; the control method is characterized by comprising the following steps:
1) starting the unit and operating a refrigeration mode;
2) detecting the air outlet temperature Toi and the relative humidity Hroi of the inner disc behind the indoor heat exchanger at intervals of time t, and calculating the air outlet moisture content Doi of the inner disc; meanwhile, calculating moisture content change trend M, wherein M is the difference value between the sum of Doi in the current T time and the sum of Doi in the previous T time; setting a median value P of the variation trend;
3) if Doi-DS is not less than delta d1, turning to step 4); if Doi-DS is less than or equal to delta d2, turning to the step 5); if delta d2 < Doi-DS < delta d1, turning to step 6); wherein DS is the set moisture content; delta d1 and delta d2 are set change values, and delta d1 is equal to or more than delta d 2;
4) if M is more than or equal to P, turning to step 6); otherwise, turning to step 8);
5) if M is less than or equal to P, turning to the step 7); otherwise, turning to step 8);
6) loading a fixed-frequency compressor or increasing the frequency of a variable-frequency compressor, and then turning to the step 2);
7) unloading the fixed-frequency compressor or reducing the frequency of the variable-frequency compressor, and then turning to the step 2);
8) the compressor maintains the current output and then goes to step 2).
2. The control method for transition season refrigeration energy saving of the constant temperature and humidity air conditioning unit according to claim 1, wherein t is 1 second.
3. The control method for the transition season refrigeration energy saving of the constant temperature and humidity air conditioning unit as claimed in claim 1, wherein the delta d1 defaults to 1g/kg and is adjustable within a range of 0.5-3 g/kg; the default of the delta d2 is-1 g/kg, and the delta d2 can be adjusted within the range of-3 to-0.5 g/kg.
4. The control method for transitional season refrigeration energy conservation of the constant temperature and humidity air conditioning unit as claimed in claim 1, wherein P is 0.6 g/kg.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110925210.1A CN113685961B (en) | 2021-08-12 | 2021-08-12 | Control method for transitional season refrigeration energy conservation of constant-temperature and constant-humidity air conditioning unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110925210.1A CN113685961B (en) | 2021-08-12 | 2021-08-12 | Control method for transitional season refrigeration energy conservation of constant-temperature and constant-humidity air conditioning unit |
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| CN113685961A CN113685961A (en) | 2021-11-23 |
| CN113685961B true CN113685961B (en) | 2022-09-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833044A (en) * | 2015-04-10 | 2015-08-12 | 广东美的制冷设备有限公司 | Constant-humidity refrigeration method and system |
| CN110243025A (en) * | 2019-06-25 | 2019-09-17 | 江苏友奥电器有限公司 | A kind of control method and device of frequency conversion dehumidifier |
| CN111076277A (en) * | 2019-12-09 | 2020-04-28 | 珠海格力电器股份有限公司 | Energy-saving system and method for accurately controlling fresh air temperature and humidity and air conditioner |
| CN112555997A (en) * | 2020-12-25 | 2021-03-26 | 珠海格力电器股份有限公司 | Fresh air handling unit and air outlet temperature and humidity control method thereof |
| CN112833579A (en) * | 2021-01-22 | 2021-05-25 | 郑州大学 | Multi-mode heat pump tobacco curing system and control method thereof |
-
2021
- 2021-08-12 CN CN202110925210.1A patent/CN113685961B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833044A (en) * | 2015-04-10 | 2015-08-12 | 广东美的制冷设备有限公司 | Constant-humidity refrigeration method and system |
| CN110243025A (en) * | 2019-06-25 | 2019-09-17 | 江苏友奥电器有限公司 | A kind of control method and device of frequency conversion dehumidifier |
| CN111076277A (en) * | 2019-12-09 | 2020-04-28 | 珠海格力电器股份有限公司 | Energy-saving system and method for accurately controlling fresh air temperature and humidity and air conditioner |
| CN112555997A (en) * | 2020-12-25 | 2021-03-26 | 珠海格力电器股份有限公司 | Fresh air handling unit and air outlet temperature and humidity control method thereof |
| CN112833579A (en) * | 2021-01-22 | 2021-05-25 | 郑州大学 | Multi-mode heat pump tobacco curing system and control method thereof |
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| CN113685961A (en) | 2021-11-23 |
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