CN112833523B - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN112833523B CN112833523B CN202110110921.3A CN202110110921A CN112833523B CN 112833523 B CN112833523 B CN 112833523B CN 202110110921 A CN202110110921 A CN 202110110921A CN 112833523 B CN112833523 B CN 112833523B
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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
- F24F11/62—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
- F24F11/70—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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
Abstract
The present disclosure provides an air conditioning system and a control method thereof, the air conditioning system including: an external machine and an energy storage waterway; the at least one pre-heat exchanger is communicated with the outdoor unit; the pre-heat exchanger is configured to pre-refrigerate or pre-heat water in the energy storage water circuit. According to the air conditioning system, the pre-heat exchanger is additionally arranged on the refrigerant circulation loop connected with the external machine, before the system is started, the water in the energy storage water path is pre-cooled or pre-heated through the pre-heat exchanger, the water temperature in the energy storage water path is pre-adjusted to be close to the theoretical water temperature corresponding to the set indoor temperature, and the indoor quick cooling and heating effects are achieved after the system is started.
Description
Technical Field
The disclosure belongs to the technical field of air conditioning systems, and particularly relates to an air conditioning system and a control method thereof.
Background
As all outdoor units and indoor unit pipelines of the multi-split air-conditioning system are communicated with each other, once refrigerant leakage occurs indoors, all the refrigerant in the system is leaked into one room, and the refrigerant concentration in the room is overhigh, so that potential safety hazards exist. In order to solve the problem, the heat recovery air conditioning system and the control thereof adopt water as a heat exchange medium of a refrigerant loop and indoor air, an indoor unit only flows water but not refrigerant, so that the hidden danger that the refrigerant leaks into a room is avoided, but the problem of slow response of the air conditioning system is caused because the water needs to be heated (cooled) firstly, the specific heat capacity of the water is large, and the heat exchange process of the refrigerant and the water is long, and the indoor quick refrigeration and heating effects cannot be realized.
Disclosure of Invention
Therefore, the technical problem to be solved by the present disclosure is that the response of the indoor air conditioning using water as a heat exchange medium between the refrigerant and the indoor air is slow, and the indoor quick cooling and heating effects cannot be achieved, thereby providing an air conditioning system and a control method thereof.
In order to solve the above problems, the present disclosure provides an air conditioning system including:
an external machine and an energy storage waterway; the energy storage water path is configured to exchange heat with the outdoor unit and the indoor heat exchanger respectively;
the at least one pre-heat exchanger is communicated with the outdoor unit;
the pre-heat exchanger is configured to pre-refrigerate or pre-heat water in the energy storage water circuit.
In some embodiments, the energy storage water circuit is provided with a water tank, and at least one pre-heat exchanger is arranged in the water tank and is configured to pre-cool or pre-heat water in the water tank.
In some embodiments, the water tank is provided with an outlet pipe and a return pipe, a pre-electric valve is arranged between the outlet pipe and the return pipe, and the pre-electric valve is configured to conduct the outlet pipe with the return pipe when the pre-heat exchanger performs pre-cooling or pre-heating on water in the water tank, so that the water in the water tank circularly exchanges heat along a loop of the water tank, the outlet pipe, the pre-electric valve and the return pipe.
In some embodiments, a water pump is arranged on the water outlet pipe.
In some embodiments, the water tank comprises at least two water distribution tanks, at least one pre-heat exchanger is arranged in each of the at least two water distribution tanks, and each of the at least two water distribution tanks is provided with a water return pipe and a water outlet pipe.
In some embodiments, the external unit is provided with a high-pressure gas pipe, a low-pressure gas pipe and a liquid pipe, the pre-heat exchanger comprises a first interface and a second interface, the first interface is communicated with the high-pressure gas pipe through a first high-pressure solenoid valve and communicated with the low-pressure gas pipe through a first low-pressure solenoid valve, and the second interface is communicated with the liquid pipe through a first electronic expansion valve.
In some embodiments, the outdoor unit is a heat recovery outdoor unit, the air conditioning system further includes a mode converter, the mode converter includes at least one refrigerant-water heat exchanger, the refrigerant-water heat exchanger includes a first refrigerant interface and a second refrigerant interface, the first refrigerant interface is communicated with the high-pressure air pipe through a second high-pressure solenoid valve and is communicated with the low-pressure air pipe through a second low-pressure solenoid valve, and the second refrigerant interface is communicated with the liquid pipe through a second electronic expansion valve.
In some embodiments, the refrigerant water heat exchanger further comprises a first water interface and a second water interface, the first water interface is communicated with the indoor heat exchanger through a first water pipe, the indoor heat exchanger is communicated with the water return pipe, and the second water interface is communicated with the water outlet pipe.
In some embodiments, when the water tank comprises at least two water distribution tanks, the indoor heat exchanger is respectively communicated with the water return pipes of the at least two water distribution tanks through reversing valves; and/or when the water tank comprises at least two water distribution tanks, the second water interface is communicated with the water outlet pipes of the at least two water distribution tanks sequentially through the first control valve and the reversing valve; and/or when the water tank comprises at least two water distribution tanks, the water outlet pipes of the at least two water distribution tanks are communicated through a second control valve.
In some embodiments, the first control valve is a motorized ball valve, and/or the second control valve is a motorized ball valve.
A control method adopting the air conditioning system comprises a preset cooling mode and/or a preset heating mode;
the predetermined cooling mode includes:
receiving an expected start refrigeration command;
detecting the water temperature T in a water tank in an energy storage waterway;
if T is more than or equal to T0+ theta 1, pre-refrigerating the water in the water tank through a pre-heat exchanger; turning off the pre-heat exchanger until T is less than or equal to T0-theta 2;
the predetermined heating mode includes:
receiving an expected starting heating command;
detecting the water temperature in a water tank in the energy storage waterway;
if T is less than or equal to T0-theta 3, preheating water in the water tank through a preheating heat exchanger; turning off the pre-heat exchanger until T is more than or equal to T0+ theta 4;
wherein T0 is a theoretical water temperature corresponding to the set indoor temperature, and theta 1, theta 2, theta 3 and theta 4 are preset temperature differences.
In some embodiments, the pre-chilling of the water in the tank by the pre-heat exchanger comprises: closing a first control valve between the refrigerant water heat exchanger and the water outlet pipe, and blocking water in the energy storage water path from flowing through the indoor heat exchanger; and/or opening a pre-electric valve between the water outlet pipe and the water return pipe to enable water in the energy storage water path to circularly exchange heat with the pre-heat exchanger; and/or starting a water pump on the water outlet pipe to increase the heat exchange efficiency of the pre-heat exchanger and the water in the energy storage water path;
and/or the presence of a gas in the gas,
when a preset heating mode is included, the step of pre-heating the water in the water tank through the pre-heat exchanger comprises the following steps: closing a first control valve between the refrigerant water heat exchanger and the water outlet pipe, and blocking water in the energy storage water path from flowing through the indoor heat exchanger; and/or opening a pre-electric valve between the water outlet pipe and the water return pipe to enable water in the energy storage water path to circularly exchange heat with the pre-heat exchanger; and/or starting a water pump on the water outlet pipe, and increasing the heat exchange efficiency of the heat exchanger and the water in the energy storage water path in advance.
In some embodiments, the step of turning off the pre-heat exchanger in the predetermined cooling mode and/or the predetermined heating mode further comprises: and when the expected starting time is reached, the pre-heat exchanger is turned off.
In some embodiments, the predetermined temperature difference ranges from 2 ℃ to 5 ℃.
In some embodiments, when the predetermined cooling mode is included, the step of pre-cooling the water in the water tank by the pre-heat exchanger includes: calculating the pre-treatment water temperature time t, and pre-refrigerating the water in the water tank through a pre-heat exchanger in advance relative to the expected starting time according to the pre-treatment water temperature time t;
and/or the presence of a gas in the gas,
when the preset heating mode is included, the step of pre-heating the water in the water tank through the pre-heat exchanger comprises the following steps: and calculating the pre-treatment water temperature time t, and pre-heating the water in the water tank through the pre-heat exchanger in advance relative to the expected starting time according to the pre-treatment water temperature time t.
In some embodiments, the pretreatment water temperature time t is calculated by the following formula:
in the formula, m is the mass of water in the water tank, c is the specific heat capacity of the water, Δ T is | T-T0|, Q is the set declared precooling capacity in the preset cooling mode, and Q is the set declared preheating capacity in the preset heating mode.
The air conditioning system and the control method thereof provided by the disclosure have at least the following beneficial effects:
according to the air conditioning system, the pre-heat exchanger is additionally arranged on the refrigerant circulating loop connected with the external machine, before the system is started, the water in the energy storage water path is pre-cooled or pre-heated through the pre-heat exchanger, the water temperature in the energy storage water path is pre-adjusted to be close to the theoretical water temperature corresponding to the set indoor temperature, and the indoor quick cooling and heating effects are achieved after the system is started.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present disclosure.
The reference numerals are represented as:
1. an outdoor unit; 2. a water tank; 3. pre-heat exchanger; 4. a water outlet pipe; 5. a water return pipe; 6. electrically operating a valve in advance; 7. a water pump; 8. a water distribution box; 9. a high-pressure air pipe; 10. a low pressure gas pipe; 11. a liquid pipe; 12. a first interface; 13. a second interface; 14.1, a first high-pressure electromagnetic valve; 15.1, a first low-pressure electromagnetic valve; 16.1, a first electronic expansion valve; 14.2, a second high-pressure electromagnetic valve; 15.2, a second low-pressure electromagnetic valve; 16.2, a second electronic expansion valve; 17. a mode converter; 18. a refrigerant water heat exchanger; 19. a first refrigerant interface; 20. a second refrigerant interface; 21. a first water interface; 22. a second water interface; 23. a first water pipe; 24. an indoor heat exchanger; 25. A first control valve; 26. a room; 27. a diverter valve; 28. a second control valve.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, the following embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the disclosed embodiments and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
As shown in fig. 1, the present embodiment provides an air conditioning system including: an air conditioning system comprising: the outdoor unit 1 and the energy storage waterway; the energy storage water path is configured to exchange heat with the outdoor unit 1 and the indoor heat exchanger 24 respectively; at least one pre-heat exchanger 3, wherein the at least one pre-heat exchanger 3 is communicated with the outdoor unit 1; the pre-heat exchanger 3 is configured to pre-cool or pre-heat the water in the energy storage water circuit.
According to the air conditioning system, the pre-heat exchanger 3 is additionally arranged on the refrigerant circulation loop connected with the external machine 1, before the system is started, water in the energy storage water path is pre-cooled or pre-heated through the pre-heat exchanger 3, the water temperature in the energy storage water path is pre-adjusted to be close to the theoretical water temperature corresponding to the set indoor temperature, and the indoor quick cooling and heating effects are achieved after the system is started.
In some embodiments, the energy storage water circuit is provided with a water tank 2, at least one pre-heat exchanger 3 is arranged in the water tank 2, and the pre-heat exchanger 3 is configured to pre-cool or pre-heat water in the water tank 2.
This embodiment is for improving the precooling of heat exchanger 3 in advance or preheat the effect, will heat exchanger 3 direct settings in water tank 2 in advance to in the quick heating and cooling of water, and through energy storage water route heating control, realize the quick preliminary treatment to water.
In some embodiments, the water tank 2 is provided with an outlet pipe 4 and a return pipe 5, a pre-electric valve 6 is provided between the outlet pipe 4 and the return pipe 5, and the pre-electric valve 6 is configured to conduct the outlet pipe 4 and the return pipe 5 when the pre-heat exchanger 3 pre-cools or pre-heats the water in the water tank 2, so that the water in the water tank 2 circularly exchanges heat along a loop of the water tank 2, the outlet pipe 4, the pre-electric valve 6 and the return pipe 5.
This embodiment is in order to improve the quick preliminary treatment of heat exchanger 3 to the water tank 2 internal water in advance, sets up the motorised valve 6 in advance that can directly communicate the outlet pipe 4 and the wet return 5 of water tank 2, and motorised valve 6 switches on the back in advance, and the play water of water tank 2 can directly flow back, increases the water in the water tank 2 and the heat transfer number of times of heat exchanger 3 in advance, quick adjustment temperature.
In some embodiments, a water pump 7 is provided on the outlet pipe 4. The water pump 7 can improve the circulation efficiency of the water in the water tank 2 in the energy storage water path, and can also improve the efficiency of pretreatment in the pretreatment process.
In some embodiments, the water tank 2 comprises at least two water distribution tanks 8, at least one pre-heat exchanger 3 is arranged in each of the at least two water distribution tanks 8, and the at least two water distribution tanks 8 are both provided with a water return pipe 5 and a water outlet pipe 4.
In this embodiment, in order to realize the differential regulation and control of the temperatures of different rooms 26, the water tank 2 is divided into a plurality of water distribution tanks 8, at least one pre-heat exchanger 3 is arranged in each water distribution tank 8, the water temperature in each water distribution tank 8 is subjected to independent pretreatment control, and the independent regulation and control of the temperatures of different rooms are realized.
In some embodiments, in order to provide sufficient cooling or heating capacity to the pre-heat exchanger 3, the external unit 1 is provided with a high-pressure gas pipe 9, a low-pressure gas pipe 10 and a liquid pipe 11, the pre-heat exchanger 3 comprises a first interface 12 and a second interface 13, the first interface 12 is communicated with the high-pressure gas pipe 9 through a first high-pressure solenoid valve 14.1 and communicated with the low-pressure gas pipe 10 through a first low-pressure solenoid valve 15.1, and the second interface 13 is communicated with the liquid pipe 11 through a first electronic expansion valve 16.1. Therefore, the pre-heat exchanger 3 is directly connected with the outdoor unit 1, the pre-heat exchanger 3 directly receives the cold or heat of the outdoor unit 1, and the water pretreatment speed is high.
In some embodiments, the outdoor unit 1 is a heat recovery outdoor unit, which is used as an outdoor part in a heat recovery multi-split air-conditioning system to provide stable refrigerants in three states to the system, and has high pressure, medium pressure and low pressure, so that the energy of the outdoor heat exchanger can be effectively transferred to the indoor side and utilized to achieve the purpose of energy recovery. The air conditioning system further comprises a mode converter 17, the mode converter 17 comprises at least one refrigerant water heat exchanger 18, the refrigerant water heat exchanger 18 comprises a first refrigerant interface 19 and a second refrigerant interface 20, the first refrigerant interface 19 is communicated with the high-pressure air pipe 9 through a second high-pressure solenoid valve 14.2 and is communicated with the low-pressure air pipe 10 through a second low-pressure solenoid valve 15.2, and the second refrigerant interface 20 is communicated with the liquid pipe 11 through a second electronic expansion valve 16.2.
The air conditioning system of this embodiment links up the outer machine of heat recovery with the energy storage water route through mode converter 17, and the outer machine of heat recovery is cold volume or heat transfer for the energy storage water route in the mode converter, carries out air conditioning system's normal refrigeration or heating operation.
In some embodiments, the refrigerant water heat exchanger 18 further includes a first water connector 21 and a second water connector 22, the first water connector 21 is communicated with an indoor heat exchanger 24 through a first water pipe 23, the indoor heat exchanger 24 is communicated with the water return pipe 5, and the second water connector 22 is communicated with the water outlet pipe 4.
The refrigerant-water heat exchanger 18 of the present embodiment is used for heat exchange between a refrigerant and water, and transfers the cold or heat of the refrigerant to the water in the energy storage water path, and the water carries the cold or heat to the indoor space to perform indoor air conditioning.
In some embodiments, when the water tank 2 includes at least two water distribution boxes 8, the indoor heat exchanger 24 is respectively communicated with the water return pipes 5 of the at least two water distribution boxes 8 through the reversing valves 27; and/or when the water tank 2 comprises at least two water distribution tanks 8, the second water connector 22 is communicated with the water outlet pipes 4 of the at least two water distribution tanks 8 sequentially through the first control valve 25 and the reversing valve 27; and/or, when the water tank 2 comprises at least two water distribution tanks 8, the water outlet pipes 4 of the at least two water distribution tanks 8 are communicated through the second control valve 28.
In the actual use process, different refrigeration or heating requirements may exist in the indoor heat exchangers of the same system, one refrigeration or one heating condition may exist in the two water distribution boxes 8, at this time, the two water distribution boxes 8 are respectively connected with the indoor heat exchanger 24 through the reversing valve 27, and the cold water box and the hot water box can be switched through the reversing valve 27 according to the load condition. The first control valve 25 is provided in the circulation circuit of the indoor heat exchanger 24, and can block the circulation water path when the indoor heat exchanger 24 is not operating, thereby preventing the noise from being generated by the flowing water in the indoor heat exchanger 24 in the non-operating state.
The second control valve 28 is arranged between the water outlet pipes 4 of the two water distribution boxes 8, so that water in the water distribution boxes 8 can flow in an interconnected mode, and under the condition that the second control valve 28 is opened, water in one water outlet pipe 4 can be driven to participate in circulating heat exchange, and the heat exchange effect of the indoor heat exchanger 24 is improved.
In some embodiments, the first control valve 25 is an electric ball valve, and/or the second control valve 28 is an electric ball valve, which has the advantages of low noise and good user experience compared to other kinds of valves.
The air conditioning system can carry out cold or hot pretreatment on water to realize refrigeration or heating effect quickly, can realize cold and hot automatic switching, can fully utilize the heating and refrigeration energy storage effect of the water tank, can realize refrigeration or heating enhancement effect, and further shortens the time for generating effect.
The embodiment provides a control method adopting the air conditioning system, which comprises a preset cooling mode and/or a preset heating mode;
the predetermined cooling mode includes:
s101 receives an expected start cooling command.
A user issues an expected starting refrigeration command to the air conditioning system through a remote controller, a control panel and the like, and the command is started when a certain time point is reached or after a certain time period.
S102, detecting the water temperature T in the water tank 2 in the energy storage water path. Because the heat exchange capability of the indoor heat exchanger 24 of the air conditioning system depends on the temperature of the water in the energy storage water path, the water temperature directly affects the refrigeration and heating effects of the air conditioning system, especially in the starting link, if the difference between the theoretical water temperature of the water temperature and the set temperature is smaller, the speed of the indoor temperature reaching the set temperature is faster, and vice versa. The theoretical water temperature is determined according to the set temperature and comprehensively considering the heat dissipation capacity of the indoor heat exchanger 24, the heat consumption of the room structure and the flow of the indoor heat exchanger 24, and the theoretical water temperature can meet the minimum water temperature when the indoor temperature reaches the set temperature.
S103, if T is larger than or equal to T0+ theta 1, indicating that the theoretical water temperature difference corresponding to the set temperature and the water temperature in the energy storage water path is large, pre-cooling the water in the energy storage water path, pre-refrigerating the water in the water tank 2 through the pre-heat exchanger 3 until T is smaller than or equal to T0-theta 2, turning off the pre-heat exchanger 3, and finishing the pre-cooling treatment of the water;
in some embodiments, the step of pre-cooling the water in the tank 2 by the pre-heat exchanger 3 comprises: closing a first control valve 25 between the refrigerant water heat exchanger 18 and the water outlet pipe 4, and blocking water in the energy storage water path from flowing through the indoor heat exchanger 24; and/or opening a pre-electric valve 6 between the water outlet pipe 4 and the water return pipe 5 to enable water in the energy storage water path to circularly exchange heat with the pre-heat exchanger 3; and/or starting the water pump 7 on the water outlet pipe 4 to increase the heat exchange efficiency of the heat exchanger 3 and the water in the energy storage water path in advance.
The energy storage water route of this embodiment closes first control valve 25, blocks the rivers in the energy storage water route and flows, makes heat exchanger 3 concentrate in advance and carries out the precooling to the water in the water tank 2, improves the precooling efficiency of water. The pre-electric valve 6 is opened, the water outlet of the water tank 2 can directly flow back, the heat exchange times of the water in the water tank 2 and the pre-heat exchanger 3 are increased, and the water temperature is quickly adjusted. And the water pump 7 is started, so that the water flow efficiency is improved, and the pre-cooling treatment efficiency is improved.
In this embodiment, the control of the first control valve 25, the pre-electric valve 6, and the water pump 7 does not have a strict logical sequence with whether the pre-heat exchanger 3 starts to operate, and the pre-heat exchanger 3 may be operated after the pre-heat exchanger 3 is controlled to operate, or the pre-heat exchanger 3 may be operated before the pre-heat exchanger is controlled to operate. Meanwhile, the first control valve 25, the pre-electric valve 6 and the water pump 7 can be independently controlled, and no correlation exists.
In some embodiments, in order to avoid the influence of the procedure of the pre-cooling treatment on the normal start-up of the air conditioning system, the step of turning off the pre-heat exchanger 3 in the predetermined cooling mode and/or the predetermined heating mode further includes: the desired start-up time is reached and the pre-heat exchanger 3 is switched off.
If T is less than T0+ theta 1 in S104, the pre-heat exchanger 3 is not used, after the expected starting time is reached, the pre-electric valve 6 corresponding to the indoor heat exchanger 24 to be started is closed, the first control valve 25 corresponding to the indoor heat exchanger 24 to be started is opened, the mode converter 17 is started, the refrigerant water heat exchanger 18 is started to work, the cold energy of the outer machine 1 is transmitted to the energy storage water path, the cold energy is conveyed to the indoor through the water in the energy storage water path, and heat exchange is carried out with the indoor air through the indoor heat exchanger 24, so that indoor temperature adjustment is completed.
In some embodiments, when the predetermined cooling mode is included, the step of pre-cooling the water in the water tank 2 by the pre-heat exchanger 3 includes: and calculating the pre-treatment water temperature time t, and pre-refrigerating the water in the water tank 2 through the pre-heat exchanger 3 in advance according to the pre-treatment water temperature time t.
In daily use, the expected starting time is determined by a person subjectively and can be a time point or a time period. The expected starting time is converted into an expected starting time length from the current time point to the starting time point, and the expected starting time length and the pretreatment water temperature time t can have three conditions, including that the expected starting time length is greater than, equal to or less than the pretreatment water temperature time t. And under the condition that the expected starting time is shorter than the pre-treatment water temperature time t, only the pre-treatment program can be interrupted, and the normal refrigeration program is directly started. If the expected starting time is more than or equal to the pre-treatment water temperature time t, the purpose of quick pre-cooling can be achieved only by advancing the time t for pre-cooling treatment. Therefore, accurate pre-refrigeration of the system is realized, and energy is saved.
In some embodiments, the pretreatment water temperature time t is calculated by the following formula:
in the formula, m is the mass of water in the water tank, c is the specific heat capacity of water, Δ T ═ T-T0|, Q is the set declared precooling capacity, the set declared cooling capacity, i.e. the stated rated cooling capacity on the nameplate of the set equipment.
In the embodiment, the pre-treatment water temperature time t is calculated by adopting the formula, so that the pre-cooling treatment of the water in the water tank 2 can be met, the starting time of the external unit 1 is saved, and the energy consumption is reduced.
The predetermined heating mode includes:
s201 receives an expected start heating command.
A user issues an expected starting refrigeration command to the air conditioning system through a remote controller, a control panel and the like, and the command is started when a certain time point is reached or after a certain time period.
S202, detecting the water temperature in the water tank 2 in the energy storage waterway; since the heat exchange capacity of the indoor heat exchanger 24 of the air conditioning system depends on the temperature of the water in the energy storage water path, the water temperature directly affects the cooling and heating effects of the air conditioning system, especially in the starting link, if the difference between the theoretical water temperature of the water temperature and the set temperature is smaller, the speed of the indoor temperature reaching the set temperature is faster, and vice versa.
S203, if T is less than or equal to T0-theta 3, the difference between the water temperature in the energy storage water path and the theoretical water temperature corresponding to the set temperature is large, the water in the energy storage water path needs to be preheated, and the water in the water tank 2 is preheated through the preheating device 3; and turning off the pre-heat exchanger 3 until T is more than or equal to T0+ theta 4, and finishing the preheating treatment of the water.
In some embodiments, the step of pre-heating the water in the water tank 2 by the pre-heat exchanger 3 comprises: closing a first control valve 25 between the refrigerant water heat exchanger 18 and the water outlet pipe 4, and blocking water in the energy storage water path from flowing through the indoor heat exchanger 24; and/or opening a pre-electric valve 6 between the water outlet pipe 4 and the water return pipe 5 to enable water in the energy storage water path to circularly exchange heat with the pre-heat exchanger 3; and/or starting the water pump 7 on the water outlet pipe 4 to increase the heat exchange efficiency of the heat exchanger 3 and the water in the energy storage water path in advance.
The energy storage water route of this embodiment closes first control valve 25, blocks the rivers in the energy storage water route and flows, makes heat exchanger 3 concentrate in advance and preheats the water in the water tank 2, improves the preheating efficiency of water. The pre-electric valve 6 is opened, the outlet water of the water tank 2 can directly flow back, the heat exchange times of the water in the water tank 2 and the pre-heat exchanger 3 are increased, and the water temperature is quickly adjusted. And the water pump 7 is started, so that the water flow efficiency is improved, and the preheating efficiency is improved.
In this embodiment, the control of the first control valve 25, the pre-motor-operated valve 6, and the water pump 7 does not have a strict logical sequence with whether the pre-heat exchanger 3 starts to operate, and the pre-heat exchanger 3 may be operated after the former operation is controlled, or the pre-heat exchanger 3 may be operated before the former operation is controlled. Meanwhile, the first control valve 25, the pre-electric valve 6 and the water pump 7 can be independently controlled, and no incidence relation exists.
And S204, if T is more than T0-theta 3, the heat exchanger 3 does not pass through, after the expected starting time is reached, the pre-electric valve 6 corresponding to the indoor heat exchanger 24 to be started is closed, the first control valve 25 corresponding to the indoor heat exchanger 24 to be started is opened, the mode converter 17 is started, the refrigerant water heat exchanger 18 is started to work, the heat of the outer machine 1 is transferred to the energy storage water path, the heat is conveyed to the indoor space by the water in the energy storage water path, and the heat exchange is carried out with the indoor air through the indoor heat exchanger 24, so that the indoor temperature adjustment is completed.
In some embodiments, in order to avoid the influence of the procedure of the pre-cooling treatment on the normal start-up of the air conditioning system, the step of turning off the pre-heat exchanger 3 in the predetermined cooling mode and/or the predetermined heating mode further includes: the expected start-up time T2 is reached and the pre-heat exchanger 3 is switched off.
In some embodiments, when the predetermined heating mode is included, the step of pre-heating the water in the water tank 2 by the pre-heat exchanger 3 includes: and calculating the pre-treatment water temperature time t, and pre-heating the water in the water tank 2 through the pre-heat exchanger 3 in advance according to the pre-treatment water temperature time t.
In daily use, the expected starting time is determined subjectively, so the expected starting time and the pre-treatment water temperature time t can be three conditions, namely the expected starting time is more than, equal to or less than the pre-treatment water temperature time t. And under the condition that the expected starting time is less than the pre-treatment water temperature time t, only the pre-treatment program can be interrupted, and the normal heating program is directly started. If the expected starting time is more than or equal to the pretreatment water temperature time t, the preheating treatment only needs the advance time t, and the purpose of quick preheating can be achieved. Thereby realizing the accurate preheating of the system and saving energy.
In some embodiments, the pretreatment water temperature time, t, is calculated by the following equation:
in the formula, m is the mass of water in the water tank, c is the specific heat capacity of water, Δ T ═ T-T0|, Q is the set declared preheating capacity, namely the rated heating capacity noted on the nameplate of the set equipment.
In the embodiment, the pre-treatment water temperature time t is calculated by adopting the formula, so that the pre-cooling treatment of the water in the water tank 2 can be met, the starting time of the external unit 1 is saved, and the energy consumption is reduced.
In the preset cooling mode and the preset heating mode, T0 is a theoretical water temperature corresponding to the set indoor temperature, and theta 1, theta 2, theta 3 and theta 4 are preset temperature differences.
In some embodiments, the preset temperature difference value range is 2-5 ℃, and the preset temperature difference satisfies the range, so that the pretreatment effect of the pre-cooling and pre-heating procedures can be ensured, the starting time of the external unit 1 is saved, and the energy consumption is reduced.
According to the control method of the air conditioning system, the water in the energy storage water path can be pre-cooled or pre-heated through the pre-heat exchanger, the water temperature in the energy storage water path is pre-adjusted to be close to the theoretical water temperature corresponding to the set indoor temperature, and the indoor quick cooling and heating effects are achieved.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present disclosure is to be considered as limited only by the preferred embodiments and not limited to the specific embodiments described herein, and all changes, equivalents and modifications that come within the spirit and scope of the disclosure are desired to be protected. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present disclosure, and these improvements and modifications should also be considered as the protection scope of the present disclosure.
Claims (15)
1. An air conditioning system, comprising:
the system comprises an outdoor unit (1), an energy storage waterway and an indoor heat exchanger (24); the energy storage water circuit is configured to exchange heat with the outdoor unit (1) and the indoor heat exchanger (24) respectively;
at least one pre-heat exchanger (3), the at least one pre-heat exchanger (3) being in communication with the external machine (1);
the pre-heat exchanger (3) is configured to pre-refrigerate or pre-heat water in the energy storage water circuit;
the outdoor unit (1) is provided with a high-pressure air pipe (9), a low-pressure air pipe (10) and a liquid pipe (11), the heat exchanger (3) comprises a first interface (12) and a second interface (13), the first interface (12) is communicated with the high-pressure air pipe (9) through a first high-pressure electromagnetic valve (14.1), the first interface is communicated with the low-pressure air pipe (10) through a first low-pressure electromagnetic valve (15.1), and the second interface (13) is communicated with the liquid pipe (11) through a first electronic expansion valve (16.1).
2. Air conditioning system according to claim 1, characterized in that the energy storage water circuit is provided with a water tank (2), the at least one pre-heat exchanger (3) being arranged within the water tank (2), the pre-heat exchanger (3) being configured to pre-cool or pre-heat water within the water tank (2).
3. Air conditioning system according to claim 2, characterized in that the water tank (2) is provided with an outlet pipe (4) and a return pipe (5), a pre-electric valve (6) is provided between the outlet pipe (4) and the return pipe (5), and the pre-electric valve (6) is configured to conduct the outlet pipe (4) and the return pipe (5) when the pre-heat exchanger (3) pre-cools or pre-heats the water in the water tank (2), so that the water in the water tank (2) circularly exchanges heat along the loop of the water tank (2), the outlet pipe (4), the pre-electric valve (6) and the return pipe (5).
4. Air conditioning system according to claim 3, characterized in that a water pump (7) is provided on the outlet pipe (4).
5. Air conditioning system according to claim 3, characterized in that the water tank (2) comprises at least two water distribution boxes (8), at least one pre-heat exchanger (3) is arranged in each of the at least two water distribution boxes (8), and the at least two water distribution boxes (8) are provided with a water return pipe (5) and a water outlet pipe (4).
6. Air conditioning system according to claim 5, characterized in that the outdoor unit (1) is a heat recovery outdoor unit, the air conditioning system further comprises a mode converter (17), the mode converter (17) comprises at least one refrigerant water heat exchanger (18), the refrigerant water heat exchanger (18) comprises a first refrigerant interface (19) and a second refrigerant interface (20), the first refrigerant interface (19) is communicated with the high pressure gas pipe (9) through a second high pressure solenoid valve (14.2) and is communicated with the low pressure gas pipe (10) through a second low pressure solenoid valve (15.2), and the second refrigerant interface (20) is communicated with the liquid pipe (11) through a second electronic expansion valve (16.2).
7. Air conditioning system according to claim 6, characterized in that the chilled water heat exchanger (18) further comprises a first water connection (21), a second water connection (22), the first water connection (21) being in communication with an indoor heat exchanger (24) through a first water pipe (23), the indoor heat exchanger (24) being in communication with the return pipe (5), the second water connection (22) being in communication with the outlet pipe (4).
8. Air conditioning system according to claim 7, characterized in that when the water tank (2) comprises at least two knock out boxes (8), the indoor heat exchanger (24) communicates with the return pipes (5) of the at least two knock out boxes (8) through reversing valves (27), respectively; and/or when the water tank (2) comprises at least two water distribution boxes (8), the second water interface (22) is communicated with the water outlet pipes (4) of the at least two water distribution boxes (8) sequentially through a first control valve (25) and a reversing valve (27); and/or when the water tank (2) comprises at least two water distribution boxes (8), the water outlet pipes (4) of the at least two water distribution boxes (8) are communicated through a second control valve (28).
9. Air conditioning system according to claim 8, characterized in that the first control valve (25) is an electric ball valve and/or the second control valve (28) is an electric ball valve.
10. A control method using the air conditioning system according to any one of claims 1 to 9, characterized by comprising a predetermined cooling mode, and/or a predetermined heating mode;
the predetermined cooling mode includes:
receiving an expected start refrigeration command;
detecting the water temperature T in the water tank (2) in the energy storage waterway;
if T is more than or equal to T0+ theta 1, pre-refrigerating the water in the water tank (2) through the pre-heat exchanger (3); turning off the pre-heat exchanger (3) until T is less than or equal to T0-theta 2;
the predetermined heating mode includes:
receiving an expected starting heating command;
detecting the temperature of water in the water tank (2) in the energy storage waterway;
if T is less than or equal to T0-theta 3, preheating the water in the water tank (2) through the preheating heat exchanger (3); turning off the pre-heat exchanger (3) until T is more than or equal to T0+ theta 4;
wherein T0 is a theoretical water temperature corresponding to the set indoor temperature, and theta 1, theta 2, theta 3 and theta 4 are preset temperature differences.
11. The control method of an air conditioning system as set forth in claim 10, wherein said step of pre-cooling the water in the water tank (2) by the pre-heat exchanger (3) when a predetermined cooling mode is included comprises: closing a first control valve (25) between the refrigerant water heat exchanger (18) and the water outlet pipe (4) and blocking water in the energy storage water path from flowing through the indoor heat exchanger (24); and/or opening a pre-electric valve (6) between the water outlet pipe (4) and the water return pipe (5) to enable water in the energy storage water path to circularly exchange heat with the pre-heat exchanger (3); and/or starting a water pump on the water outlet pipe (4) to increase the heat exchange efficiency of the pre-heat exchanger (3) and the water in the energy storage water path;
and/or the presence of a gas in the gas,
when a predetermined heating mode is included, the step of pre-heating the water in the water tank (2) by the pre-heat exchanger (3) includes: closing a first control valve (25) between the refrigerant water heat exchanger (18) and the water outlet pipe (4) and blocking water in the energy storage water path from flowing through the indoor heat exchanger (24); and/or opening a pre-electric valve (6) between the water outlet pipe (4) and the water return pipe (5) to enable water in the energy storage water path to circularly exchange heat with the pre-heat exchanger (3); and/or starting a water pump on the water outlet pipe (4) to increase the heat exchange efficiency of the heat exchanger (3) and the water in the energy storage water path.
12. The control method of an air conditioning system according to claim 10, wherein the step of turning off the preliminary heat exchanger (3) in the predetermined cooling mode and/or the predetermined heating mode further comprises: the expected starting time is reached, and the pre-heat exchanger (3) is switched off.
13. The control method of an air conditioning system according to claim 10, wherein the preset temperature difference is in a range of 2 ℃ to 5 ℃.
14. The control method of an air conditioning system according to any one of claims 10 to 13, wherein the step of pre-cooling the water in the water tank (2) by the pre-heat exchanger (3) when a predetermined cooling mode is included, comprises: calculating the pre-treatment water temperature time t, and pre-refrigerating the water in the water tank (2) through the pre-heat exchanger (3) in advance relative to the expected starting time according to the pre-treatment water temperature time t;
and/or the presence of a gas in the gas,
when a predetermined heating mode is included, the step of pre-heating the water in the water tank (2) by the pre-heat exchanger (3) includes: and calculating the pre-treatment water temperature time t, and pre-heating the water in the water tank (2) through the pre-heat exchanger (3) in advance relative to the expected starting time according to the pre-treatment water temperature time t.
15. The control method of an air conditioning system according to claim 14, wherein the pre-treatment water temperature time t is calculated by the following formula:
in the formula, m is the mass of water in the water tank, c is the specific heat capacity of the water, Δ T is | T-T0|, Q is the set declared precooling capacity in the preset cooling mode, and Q is the set declared preheating capacity in the preset heating mode.
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| JP2569796B2 (en) * | 1989-04-11 | 1997-01-08 | ダイキン工業株式会社 | Thermal storage type air conditioner |
| JPH0359358A (en) * | 1989-07-28 | 1991-03-14 | Toshiba Corp | Air conditioner |
| JP4350836B2 (en) * | 1999-05-31 | 2009-10-21 | 三菱電機株式会社 | Air conditioner |
| CN102042713A (en) * | 2009-10-23 | 2011-05-04 | 王天祥 | Double-energy storage air conditioner water heating machine |
| CN106679271A (en) * | 2016-10-27 | 2017-05-17 | 青岛海尔特种电冰柜有限公司 | Outdoor unit for heat recovery type refrigeration equipment and split type refrigeration equipment |
| CN107166595A (en) * | 2017-06-26 | 2017-09-15 | 美的集团武汉制冷设备有限公司 | Air-conditioning system and its control method |
| CN207335020U (en) * | 2017-09-25 | 2018-05-08 | 陈彬明 | A kind of thermostatted water air-conditioning of intelligent control |
| CN107990456A (en) * | 2017-11-23 | 2018-05-04 | 宁波杭州湾新区祥源动力供应有限公司 | A kind of heat-exchange unit system |
| CN208765303U (en) * | 2018-09-05 | 2019-04-19 | 珠海格力电器股份有限公司 | Air-conditioning system |
| CN109210820A (en) * | 2018-09-13 | 2019-01-15 | 珠海格力电器股份有限公司 | A kind of multifunctional heat pump and its switching method for implementing different function |
| CN109520052B (en) * | 2018-11-21 | 2021-03-23 | 哈尔滨工业大学 | Renewable energy source heat pump system suitable for energy-saving reconstruction of existing residential building |
| CN209214139U (en) * | 2018-12-12 | 2019-08-06 | 厦门铸力节能科技有限公司 | A kind of refrigeration system liquid refrigerant heat recovery energy-saving device |
| CN109959073A (en) * | 2019-04-28 | 2019-07-02 | 珠海格力电器股份有限公司 | Air-conditioning system and its operation method |
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