CN110567124A - Energy adjusting method of modular water machine - Google Patents
Energy adjusting method of modular water machine Download PDFInfo
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- CN110567124A CN110567124A CN201910884608.8A CN201910884608A CN110567124A CN 110567124 A CN110567124 A CN 110567124A CN 201910884608 A CN201910884608 A CN 201910884608A CN 110567124 A CN110567124 A CN 110567124A
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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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)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
the invention relates to an energy adjusting method of a modular water machine, which comprises a loading interval, a load shedding interval and a holding interval, wherein the loading and the load shedding are timely adjusted through detecting the water temperature, so that the problems of insufficient rapidness in loading, large water temperature fluctuation, frequent start and stop of a unit, easiness in water temperature protection of the unit and the like are effectively solved, and the requirements of users are fully met.
Description
Technical Field
The invention relates to an air conditioner control technology, in particular to a control method suitable for a modular water machine, and specifically relates to an energy adjusting method of the modular water machine.
background
The commercial and industrial air conditioning systems generally use modular cooling and heating water units, hereinafter referred to as modular units, which are combined into a large cooling capacity system by a plurality of small cooling capacity units, thereby satisfying diversified requirements of customers. The small refrigeration units are mutually independent and influence the refrigeration output of the whole system by opening or closing the small refrigeration units. Meanwhile, the large-cooling-capacity system shares one set of water system, and a plurality of tail ends are connected in series and in parallel in the water system for customers to use.
at present, most of the units use fixed-frequency compressors, and the cold output is controlled by the number of loading and unloading systems, so that the water temperature of the whole system is controlled. The following problems are prevalent:
1) the system stability is poor. For example, in the loading area, the loading is only performed once at intervals, the water temperature of the unit rapidly decreases after a certain number of systems are loaded, but the unit is still in the loading area, so that the unit is still loaded, the number of loaded units is excessive, the load reduction is affected, the unit is fully reduced, the unit is reloaded when the water temperature rises to the loading area, the number of loaded units needs to be rebalanced, the frequent load increase and reduction of the unit can occur, meanwhile, the water temperature is not stable enough, the reduction is easy, and the protection or the failure is caused.
2) The period is not properly established. The larger the water system is, the larger the hysteresis of the water temperature is, because of the influence of factors such as the water capacity of the system, the conveying distance and the like. If the period is set to be too long, the loading speed of the system is slow, which is helpful for solving the hysteresis of the water temperature, but the response to the water temperature is lagged, which causes large fluctuation of the water temperature, especially when the water temperature is far away from the target value during the first loading, the loading time is long, the water temperature is slowly reduced, and thus the long time for cooling is needed, which is contrary to the requirement of rapid cooling of customers. If the period is set to be too short, the number of the units is excessively overshot due to the hysteresis of the water temperature, and the system is not easy to stabilize, so that the units are frequently loaded and unloaded, and the service life of the units is shortened.
disclosure of Invention
the invention aims to provide an energy adjusting method of a modular water machine, which aims to overcome the defects of the prior art, effectively solves the problems of insufficient quick loading, large water temperature fluctuation, frequent start and stop of the machine set, easy water temperature protection of the machine set and the like by detecting the water temperature and timely adjusting the loading and unloading, and fully meets the requirements of users.
the technical scheme of the invention is as follows:
an energy adjusting method of a modular water machine comprises a loading interval, a load shedding interval and a holding interval, and comprises the following steps:
1) detecting the water temperature T, and setting a target water temperature Ts and a control precision D;
2) In the refrigeration mode, if T is more than Ts + D, turning to the step 3); if T is less than Ts-D, turning to the step 4); if Ts-D is not less than T not more than Ts + D, turning to the step 5); or, in the heating mode, if T is more than Ts + D, turning to the step 4); if T is less than Ts-D, turning to the step 3); if Ts-D is not less than T not more than Ts + D, turning to the step 5);
3) loading an interval, and turning to the step 3.1) if T is more than Ts + D + 5; if Ts + D +3 is more than or equal to Ts + D +5, turning to the step 3.2); if Ts + D +1 is more than or equal to Ts + D +3, turning to the step 3.3);
3.1) fast load with a load period of t+1: detecting the water temperature falling speed V ', if V' is less than or equal to V1, turning to step 3.4); if V' > V1, turning to step 1);
3.2) Stable Loading with a Loading period of t+2: detecting the water temperature falling speed V ', if V' is less than or equal to V2, turning to step 3.4); if V' > V2, turning to step 1);
3.3) Adaptation to the load region, load period t+3: detecting the water temperature falling speed v ', and turning to the step 1) if v' is less than or equal to 0; if V' is more than or equal to 0 and less than or equal to V3, turning to the step 3.4); if V' > V3, go to step 3.5);
3.4) judging the waiting time t of the unit, and if t reaches the corresponding loading period, turning to the step 3.6); otherwise, returning to the step 1);
3.5) judging whether t reaches the loading period t+4(ii) a If yes, turning to step 3.6), otherwise, returning to step 1);
3.6) loading a system and then returning to the step 1);
4) In the load shedding interval, if Ts-D is less than T and less than Ts-D-2, turning to the step 4.1); if Ts-D-1 is more than T and less than Ts-D-2, turning to the step 4.2); if T is less than Ts-D-2, turning to the step 4.3);
4.1) adapting to the deloading area with a deloading period of t-1: detecting the rising speed v 'of the water temperature, and if v' is less than or equal to 0, turning to the step 4.4); if v' > 0, turning to the step 1);
4.2) a rapid load shedding area, which is used for shedding half of the number of systems and is only executed once; then turning to the step 1);
4.3) in an emergency stop area, fully unloading the unit; then turning to the step 1);
4.4) judging whether the waiting time t of the unit reaches a load shedding period, if so, shedding a system, and then returning to the step 1); otherwise, turning to the step 1);
5) keeping the interval, if Ts + D is less than T and less than Ts-D, turning to the step 5.1), otherwise, turning to the step 1);
5.1) if the water temperature is reduced, detecting the water temperature reduction speed v'; if the water temperature rises, detecting the water temperature rising speed v';
5.2) if V' > V5, then go to step 5.3), otherwise go to step 1); if V' is greater than V6, then go to step 5.4), otherwise, go to step 1);
5.3) judging whether the waiting time t of the unit reaches the load shedding period t-2(ii) a If yes, unloading one system, and then returning to the step 1); otherwise, turning to the step 1);
5.4) judging whether the waiting time of the unit reaches the loading period t+5(ii) a If yes, loading a system, and then returning to the step 1); otherwise, turning to the step 1).
Further, V1, V2, V3, V4, V5 and V6 are all set values.
The invention has the beneficial effects that:
1. When the water temperature is far away from the target water temperature, the water is quickly loaded, the effect is quickly given to a client, and the condition that the response of the client is too slow is prevented;
2. the water temperature hysteresis and the water temperature change speed are coordinated and loaded, so that the response time of the water temperature is fully given, and the change speed and trend of the water temperature are considered, so that the excessive overshoot of the unit is prevented;
3. the water temperature control precision is high, the load and the load are also increased and decreased in advance in the holding area, so that the control precision of the unit is high, the area can be increased and decreased in advance, the response time and range of the water temperature are wider, and the water temperature rise is prevented from being too high or too low;
4. the unit is prevented from being started and stopped frequently, the number of the over-regulation systems is controlled, the number of the unit for starting and stopping is reduced, and the problem that the original control loading system is started and stopped repeatedly in such a way that the load is reduced completely after the number of the original control loading systems is large is solved.
Detailed Description
the present invention will be further described with reference to the following examples.
A module water machine is a large cold quantity system formed by combining a plurality of small cold quantity machine sets. The small refrigeration units are mutually independent and influence the refrigeration output of the whole system by opening or closing the small refrigeration units. Meanwhile, the large-cooling-capacity system shares one set of water system, and a plurality of tail ends are connected in series and in parallel in the water system for customers to use.
the adjusting method of the modular water machine comprises the following steps:
1) detecting the water temperature T of the system, and setting a target water temperature Ts and control precision D;
2) in the refrigeration mode, if T is more than Ts + D, turning to the step 3); if T is less than Ts-D, turning to the step 4); if Ts-D is not less than T not more than Ts + D, turning to the step 5); or, in the heating mode, if T is more than Ts + D, turning to the step 4); if T is less than Ts-D, turning to the step 3); if Ts-D is not less than T not more than Ts + D, turning to the step 5);
3) Loading an interval, and turning to the step 3.1) if T is more than Ts + D + 5; if Ts + D +3 is more than or equal to Ts + D +5, turning to the step 3.2); if Ts + D +1 is more than or equal to Ts + D +3, turning to the step 3.3);
3.1) fast load with a load period of t+1: detecting the water temperature falling speed V ', if V' is less than or equal to V1, turning to step 3.4); if V' > V1, turning to step 1);
3.2) Stable Loading with a Loading period of t+2: detecting the water temperature falling speed V ', if V' is less than or equal to V2, turning to step 3.4); if V' > V2, turning to step 1);
3.3) Adaptation to the load region, load period t+3: detecting the water temperature falling speed v ', and turning to the step 1) if v' is less than or equal to 0; if V' is more than or equal to 0 and less than or equal to V3, turning to the step 3.4); if V' > V3, go to step 3.5);
3.4) judging the waiting time t of the unit, and if t reaches the corresponding loading period, turning to the step 3.6); otherwise, returning to the step 1);
3.5) judging whether t reaches the loading period t+4(ii) a If yes, turning to step 3.6), otherwise, returning to step 1);
3.6) loading a system and then returning to the step 1);
4) in the load shedding interval, if Ts-D is less than T and less than Ts-D-2, turning to the step 4.1); if Ts-D-1 is more than T and less than Ts-D-2, turning to the step 4.2); if T is less than Ts-D-2, turning to the step 4.3);
4.1) adapting to the deloading area with a deloading period of t-1: detecting the rising speed v 'of the water temperature, and if v' is less than or equal to 0, turning to the step 4.4); if v' > 0, turning to the step 1);
4.2) a rapid load shedding area, which is used for shedding half of the number of systems and is only executed once; then turning to the step 1);
4.3) in the emergency stop area, the unit is fully unloaded, so that the unit is protected from being frozen; then turning to the step 1);
4.4) judging whether the waiting time t of the unit reaches a load shedding period, if so, shedding a system, and then returning to the step 1); otherwise, turning to the step 1);
5) keeping the interval, if Ts + D is less than T and less than Ts-D, turning to the step 5.1), otherwise, turning to the step 1);
5.1) if the water temperature is reduced, detecting the water temperature reduction speed v'; if the water temperature rises, detecting the water temperature rising speed v';
5.2) if V' > V5, then go to step 5.3), otherwise go to step 1); if V' is greater than V6, then go to step 5.4), otherwise, go to step 1);
5.3) judging whether the waiting time t of the unit reaches the load shedding period t-2(ii) a If yes, unloading one system, and then returning to the step 1); otherwise, turning to the step 1);
5.4) judging whether the waiting time of the unit reaches the loading period t+5(ii) a If yes, loading a system, and then returning to the step 1); otherwise, turning to the step 1).
The V1, V2, V3, V4, V5 and V6 are all set values and can be adjusted to meet the requirements of different models.
each loading period or each unloading period can be adjusted according to the change speed of the water temperature, so that the requirement of accurate control can be better met.
the parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (2)
1. An energy adjusting method of a module water machine is characterized in that: the energy regulation method comprises a loading interval, a load shedding interval and a holding interval, and comprises the following steps:
1) Detecting the water temperature T, and setting a target water temperature Ts and a control precision D;
2) In the refrigeration mode, if T is more than Ts + D, turning to the step 3); if T is less than Ts-D, turning to the step 4); if Ts-D is not less than T not more than Ts + D, turning to the step 5); or, in the heating mode, if T is more than Ts + D, turning to the step 4); if T is less than Ts-D, turning to the step 3); if Ts-D is not less than T not more than Ts + D, turning to the step 5);
3) Loading an interval, and turning to the step 3.1) if T is more than Ts + D + 5; if Ts + D +3 is more than or equal to Ts + D +5, turning to the step 3.2); if Ts + D +1 is more than or equal to Ts + D +3, turning to the step 3.3);
3.1) fast load with a load period of t+1: detecting the water temperature falling speed V ', if V' is less than or equal to V1, turning to step 3.4); if V' > V1, turning to step 1);
3.2) Stable Loading with a Loading period of t+2: detecting the water temperature falling speed V ', if V' is less than or equal to V2, turning to step 3.4); if V' > V2, turning to step 1);
3.3) Adaptation to the load region, load period t+3: detecting the water temperature falling speed v ', and turning to the step 1) if v' is less than or equal to 0; if V' is more than or equal to 0 and less than or equal to V3, turning to the step 3.4); if V' > V3, go to step 3.5);
3.4) judging the waiting time t of the unit, and if t reaches the corresponding loading period, turning to the step 3.6); otherwise, returning to the step 1);
3.5) judging whether t reaches the loading period t+4(ii) a If yes, turning to step 3.6), otherwise, returning to step 1);
3.6) loading a system and then returning to the step 1);
4) In the load shedding interval, if Ts-D is less than T and less than Ts-D-2, turning to the step 4.1); if Ts-D-1 is more than T and less than Ts-D-2, turning to the step 4.2); if T is less than Ts-D-2, turning to the step 4.3);
4.1) adapting to the deloading area with a deloading period of t-1: detecting the rising speed of water temperaturev ', if v' is less than or equal to 0, turning to the step 4.4); if v' > 0, turning to the step 1);
4.2) a rapid load shedding area, which is used for shedding half of the number of systems and is only executed once; then turning to the step 1);
4.3) in an emergency stop area, fully unloading the unit; then turning to the step 1);
4.4) judging whether the waiting time t of the unit reaches a load shedding period, if so, shedding a system, and then returning to the step 1); otherwise, turning to the step 1);
5) Keeping the interval, if Ts + D is less than T and less than Ts-D, turning to the step 5.1), otherwise, turning to the step 1);
5.1) if the water temperature is reduced, detecting the water temperature reduction speed v'; if the water temperature rises, detecting the water temperature rising speed v';
5.2) if V' > V5, then go to step 5.3), otherwise go to step 1); if V' is greater than V6, then go to step 5.4), otherwise, go to step 1);
5.3) judging whether the waiting time t of the unit reaches the load shedding period t-2(ii) a If yes, unloading one system, and then returning to the step 1); otherwise, turning to the step 1);
5.4) judging whether the waiting time of the unit reaches the loading period t+5(ii) a If yes, loading a system, and then returning to the step 1); otherwise, turning to the step 1).
2. the energy adjusting method of the modular water machine as claimed in claim 1, wherein: the V1, V2, V3, V4, V5 and V6 are all set values.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728724A (en) * | 2021-02-01 | 2021-04-30 | 南京天加环境科技有限公司 | Energy adjusting mode of central air conditioning system |
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