CN115614927B - Air conditioning system and defrosting control method thereof - Google Patents
Air conditioning system and defrosting control method thereof Download PDFInfo
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- CN115614927B CN115614927B CN202211415741.7A CN202211415741A CN115614927B CN 115614927 B CN115614927 B CN 115614927B CN 202211415741 A CN202211415741 A CN 202211415741A CN 115614927 B CN115614927 B CN 115614927B
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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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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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Abstract
The invention discloses an air conditioning system and a defrosting control method thereof. Wherein the air conditioning system includes: the heat exchange device comprises a unit circulation pipeline, at least one heat-accumulating heat exchange device and a plurality of parallel outdoor units, wherein the outdoor units are respectively connected with the unit circulation pipeline and the heat-accumulating heat exchange device through valves; when the outdoor unit normally operates, the outdoor unit is communicated with a unit circulation pipeline and disconnected with the heat-accumulating heat exchange device; when the outdoor unit is defrosted, the outdoor unit is disconnected with the unit circulation pipeline and is communicated with the heat-storable heat exchange device, and defrosting is performed through heat accumulated in the heat-storable heat exchange device. The invention can realize defrosting while heating, and the temperature fluctuation at the use side is smaller.
Description
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to an air conditioning system and a defrosting control method thereof.
Background
In the prior art, a defrosting mode of an air conditioning system generally does not allow a unit to heat during defrosting. In order to defrost and realize heating, a plurality of outdoor heat exchangers are needed, and a multi-module water chilling unit is taken as an example, so that the water chilling unit can obviously reduce the water outlet temperature in the defrosting process, and the comfort experience of the user use side can be influenced.
The patent number 202111543593.2 in the prior art discloses a defrosting method of an air conditioning unit, namely, a first heat exchanger group in the heat exchanger groups is controlled to be continuously used as an evaporator, and the rest second heat exchanger groups are controlled to be switched to be used as condensers so as to facilitate the integral defrosting of the heat exchanger groups by the heat generated by the condensation of the second heat exchanger groups; however, the defrosting control requires that the heat exchangers of the heat exchange unit have smaller intervals, so that the installation difficulty is increased, meanwhile, the reliable operation of the unit is influenced due to the fact that the intervals of the heat exchangers are too small, and the maintenance cost is increased.
Therefore, how to provide a new air conditioning system structure, so that defrosting of the air conditioning system during heating will not cause a larger temperature fluctuation at the user side, is a technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the technical problem that the temperature fluctuation of a user side is large due to simultaneous heating and defrosting in the prior art, the invention provides an air conditioning system and a defrosting control method thereof.
The air conditioning system provided by the invention comprises: the heat exchange device comprises a unit circulation pipeline, at least one heat-accumulating heat exchange device and a plurality of parallel outdoor units, wherein the outdoor units are respectively connected with the unit circulation pipeline and the heat-accumulating heat exchange device through valves;
when the outdoor unit heats normally, the outdoor unit is communicated with a unit circulation pipeline and disconnected with the heat-accumulating heat exchange device;
When the outdoor unit is defrosted, the outdoor unit is disconnected with the unit circulation pipeline and is communicated with the heat-storable heat exchange device, and defrosting is performed through heat accumulated in the heat-storable heat exchange device.
Further, the air conditioning system is a water-cooled air conditioning system.
Further, the unit circulation pipeline comprises a total water outlet pipe for collecting the water outlet pipes of at least one outdoor unit and a total water inlet pipe for shunting the water inlet pipes of at least one outdoor unit.
Further, the heat-storable heat exchange device includes: the heat storage box is provided with a heater for providing heat for the heat storage box and a heat exchange pipeline which is arranged in the heat storage box and exchanges heat with heat storage liquid in the heat storage box;
When the outdoor unit is communicated with the heat-accumulating heat exchange device, a water inlet pipe and a water outlet pipe of the outdoor unit are connected with the heat exchange pipeline in series.
Further, the heat storage tank is a heat preservation water tank.
Further, the heater includes a solar water heater.
Further, if the temperature fluctuation of the use side of the air conditioning system is within a preset fluctuation range when the non-frosted outdoor unit is disconnected from the unit circulation pipeline, the non-frosted outdoor unit is communicated with the heat-storage heat exchange device to be used as the heater.
Further, the valve is a three-way valve.
The defrosting control method of the air conditioning system provided by the invention comprises the following steps:
Detecting whether the outdoor unit meets defrosting conditions;
And if the outdoor unit meets the defrosting condition, controlling the corresponding valve to disconnect the outdoor unit from the unit circulation pipeline, and communicate the outdoor unit with the heat-storable heat exchange device, and defrosting by heat accumulated in the heat-storable heat exchange device.
Further, when the air conditioning system is a water-cooled air conditioning system, the defrosting conditions include:
The accumulated running time of the compressor of the outdoor unit after being started is larger than or equal to the preset running time, the water outlet temperature of the outdoor unit is larger than or equal to the preset water outlet temperature when the heating mode is detected for a plurality of times within a certain period of time, and the difference value of the outdoor environment temperature minus the fin temperature of the outdoor unit is larger than or equal to the preset difference value.
Further, when the outdoor unit satisfies a defrosting condition, the control of the heat exchanging device capable of storing heat includes:
Detecting the temperature of the heat storage liquid in the heat storage box of the heat exchange device capable of storing heat, directly starting defrosting if the temperature of the heat storage liquid is greater than or equal to the preset heat storage temperature, otherwise, controlling a heater of the heat exchange device capable of storing heat to heat the heat storage liquid, and starting defrosting after heating is completed.
Further, when the air conditioning system is a multi-module water-cooled air conditioning system, the heat storage tank is a heat preservation water tank, and the heater includes a solar water heater, controlling the heater of the heat exchange device capable of storing heat to heat the heat storage liquid includes:
detecting the outlet water temperature of the solar water heater;
If the water outlet temperature of the solar water heater is greater than or equal to the sum of the preset heat storage temperature plus the first preset increment, the solar water heater is controlled to circularly heat the heat preservation water tank until the water outlet temperature of the solar water heater is less than the preset heat storage temperature, or the water temperature of the heat preservation water tank is greater than the sum of the preset heat storage temperature plus the second preset increment, and heating is completed;
If the water outlet temperature of the solar water heater is smaller than the sum of the preset heat storage temperature and the first preset increment, controlling an outdoor unit with the minimum deviation between the target water outlet temperature and the actual water outlet temperature and without defrosting to serve as a heater to supply heat for the heat preservation water tank, and finishing heating when the water temperature of the heat preservation water tank is larger than the sum of the preset heat storage temperature and the second preset increment.
The invention does not stop heating in the defrosting process, avoids the occurrence of larger temperature fluctuation on the user side of the user, and ensures the comfort experience of the user. The unit module which is in defrosting can not be heated in the defrosting process, and the unit module which needs defrosting is separated from the main pipeline through controlling the corresponding three-way valve to exchange heat with the heat-storage heat exchange device, so that the heating of an air conditioning system is not affected, the heater of the heat-storage heat exchange device can select a solar water heater, or the heat is stored through the heat generated by the unit, and the heat in the heat-storage device is absorbed in the defrosting process of the unit, so that the fluctuation of the water temperature at the use side is avoided.
Drawings
The invention is described in detail below with reference to examples and figures, wherein:
fig. 1 is a schematic diagram of an air conditioning system according to an embodiment of the present invention.
FIG. 2 is a defrosting flow diagram of an embodiment of the invention.
Fig. 3 is a control flow chart of a heat exchange device capable of accumulating heat according to an embodiment of the present invention.
Reference numerals illustrate:
1A, a unit module; 1B, a unit module; 1C, a unit module; 1N, a unit module; 2. a main water inlet pipe; 3. a main water outlet pipe; 4. a heat exchange device capable of accumulating heat; 5. a first temperature sensor; 6. a solar water heater; 7. a second temperature sensor; 8. and a three-way valve.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the invention, not to imply that each embodiment of the invention must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
The air conditioning system comprises a unit circulation pipeline, a plurality of outdoor units connected through the unit circulation pipeline and at least one heat-accumulating heat exchange device.
The outdoor units are respectively connected with the heat exchanger device capable of accumulating heat through valves. When the outdoor unit is normally operated, the outdoor unit is communicated with the unit circulation pipeline and disconnected with the heat exchange device capable of accumulating heat. The air conditioning system is not different from other existing air conditioning units in operation. At this time, the heat-accumulating heat exchange device does not participate in any heat exchange process.
When defrosting is needed for the outdoor unit, the outdoor unit is disconnected from the unit circulation pipeline, the outdoor unit is not involved in the original heat exchange process of the air conditioning system, but is communicated with the heat exchange device capable of storing heat, and exchanges heat with the heat exchange device capable of storing heat, and defrosting is carried out through heat stored in the heat exchange device capable of storing heat.
According to the invention, the heat exchange pipeline of the outdoor unit is switched, so that the outdoor unit which does not need defrosting continuously maintains the heating requirement of the user side, and the temperature of the user side is kept stable. The outdoor unit requiring defrosting exchanges heat through an additional pipeline, so that temperature fluctuation of a use side is not caused. The heat exchange device capable of accumulating heat can be used for defrosting a plurality of outdoor units, so that the overall structural design of an air conditioning system is simpler.
The specific pipeline structures of the unit circulation pipelines in different air conditioning systems are also different.
In one embodiment, when the air conditioning system is a multi-split air conditioning system, the outdoor unit mainly comprises an outdoor heat exchanger and a fan, and the unit circulation pipeline comprises a total liquid inlet pipe and a total liquid outlet pipe, for example, during heating, a refrigerant flows out from an exhaust port of the compressor, passes through at least one indoor heat exchanger, an electronic expansion valve and the like, then reaches the total liquid inlet pipe, and the refrigerant of the total liquid inlet pipe is split into the liquid inlet pipes of the outdoor heat exchangers, flows out from the liquid outlet pipes of the outdoor heat exchangers, is collected into one total liquid outlet pipe (corresponding to the liquid outlet of the outdoor heat exchangers), and finally flows back to the air suction port of the compressor.
When defrosting is needed after the outdoor heat exchanger of the outdoor unit is frosted, the outdoor heat exchanger of the multi-split air conditioning system can be disconnected from a refrigerant pipeline through a control valve (such as a three-way valve), and the refrigerant of the outdoor heat exchanger is circulated to a heat exchanging device capable of accumulating heat through a pump body and the like for heating and then flows back to the outdoor heat exchanger for defrosting.
In another embodiment, when the air conditioning system is a water-cooled air conditioning system, the unit circulation pipeline includes a total water inlet pipe (may also be referred to as a total liquid inlet pipe) and a total water outlet pipe (may also be referred to as a total liquid outlet pipe), the water-cooled air conditioning system includes at least one unit module, each unit module is referred to as an outdoor unit, and a set of circulation pipeline is arranged in each unit module (outdoor unit), for example, after the refrigerant of the compressor flows out from the air outlet, the refrigerant passes through the condenser, the electronic expansion valve, the evaporator and the like, and then flows back to the air suction port of the compressor. Besides the refrigerant circulation pipeline inside the outdoor unit, the water flow pipeline for heat exchange with the refrigerant pipeline is arranged, the water outlet pipes of the water flow pipeline of one or more outdoor units are converged to the total water outlet pipe, and the water of the water inlet pipe of the water flow pipeline of one or more outdoor units is branched from the total water inlet pipe. Taking heating as an example, a refrigerant pipeline of a condenser of the outdoor unit exchanges heat with a water flow pipeline.
The heat-storable heat exchange device of the present invention is described below.
The heat exchanging device capable of accumulating heat mainly comprises a heat accumulating box and a heater.
The heat storage tank is internally provided with heat storage liquid, the heater provides heat for the heat storage tank, and a heat exchange pipeline for exchanging heat with the heat storage liquid in the heat storage tank is arranged in the heat storage tank.
For example, in a multi-split air conditioning system, an outdoor heat exchanger of an outdoor unit is connected in series with a heat exchange pipeline, i.e. a refrigerant flows through the heat exchange pipeline.
For example, in the water-cooling air conditioning system, when the outdoor unit is in defrosting, the four-way valve of the outdoor unit needs to be reversed firstly, then the water inlet pipe and the water outlet pipe of the outdoor unit are connected in series with a heat exchange pipeline, and water flows through the heat exchange pipeline.
Through the heat exchange device capable of storing heat, when the outdoor unit needs defrosting, the outdoor unit flows to the heat exchange medium of the unit circulation pipeline under the action of parts such as a pump and the like, and the heat exchange medium flows to the heat exchange device capable of storing heat, so that the frosting of the fins of the outdoor unit is performed.
In one embodiment, the heat storage tank is a holding tank.
In one embodiment, the heater comprises a solar water heater, and water in the heat preservation water tank can be circularly heated through the solar water heater, so that solar energy is fully utilized, the need of extra energy for defrosting an outdoor unit is avoided, and energy sources are saved.
When the invention is applied to a multi-module water-cooling air conditioning system, the heater can utilize other non-frosted outdoor units besides the solar water heater, and if the temperature fluctuation of the use side of the air conditioning system is in a preset fluctuation range when the non-frosted outdoor units are disconnected from a unit circulation pipeline, the non-frosted outdoor units can be communicated with a heat-accumulating heat exchange device to be used as the heater, and the non-frosted outdoor units are reconnected after the heating is finished and added into the unit circulation pipeline for continuous use.
Besides solar water heater, the heater of the invention can also adopt other heating modes, which belong to the protection scope of the invention.
Fig. 1 shows a schematic structural diagram of an air conditioning system according to the present invention.
In this embodiment, the air conditioning system is in particular a water-cooled air conditioning system having at least two unit modules, the unit modules 1A, 1B, 1C, 1N being shown in the figure, the outlet pipe of the condenser of each unit module being connected to the total outlet pipe 3 in the heating mode, the inlet pipe of the condenser of each unit module being connected to the total inlet pipe 2, thereby enabling parallel connection between the respective unit modules.
The heat exchange device 4, which can store heat, is connected to the water inlet and outlet pipes of the respective unit modules, which in one embodiment can be connected via a three-way valve 8. The three-way valve 8 can be independently controlled by each unit module, and when the unit modules normally operate, the unit modules control the corresponding three-way valves 8 to be communicated with the main water inlet pipe 2 and the main water outlet pipe 3, and meanwhile, the connection between the three-way valves and the heat-accumulating heat exchange device 4 is disconnected. When the unit module enters defrosting, the unit module controls the four-way valve to change direction, and meanwhile, the three-way valve 8 changes direction, at the moment, the condenser of the unit module is changed into an evaporator, and the water inlet pipe and the water outlet pipe of the evaporator are disconnected with the total water inlet pipe 2 and the total water outlet pipe 3, so that the unit module circulates from the heat-accumulating heat exchange device.
The heat-storable heat exchanging device 4 in fig. 1 is provided with a first temperature sensor 5 for detecting the temperature of the heat storage liquid in the heat storage tank, and a second temperature sensor 7 for detecting the outlet water temperature of the solar water heater 6. The water outlet pipe of the solar water heater 6 is also provided with a water pump.
Based on the air conditioning system introduced by each embodiment of the technical scheme, the invention also provides a defrosting control method of the air conditioning system.
The detailed steps of the defrosting control method of the air conditioning system are described below.
And detecting whether the outdoor unit meets defrosting conditions.
If it is detected that a certain outdoor unit meets the defrosting condition, the corresponding valve is controlled, so that the outdoor unit is disconnected from the original unit circulation pipeline and is communicated with the heat exchange device capable of storing heat, and defrosting is performed through heat stored in the heat exchange device capable of storing heat.
In one embodiment, when the air conditioning system is a water-cooled air conditioning system, the following technical scheme is mainly adopted in the defrosting control method of the air conditioning system, where a certain unit module is judged to meet the defrosting condition.
When the accumulated running time of the compressor of the unit module after being started is larger than or equal to the preset running time, and the water outlet temperature of the outdoor unit is larger than or equal to the preset water outlet temperature when the heating mode is detected for a plurality of times within a certain period of time, and the difference value of the outdoor environment temperature minus the fin temperature (also called as defrosting temperature) of the outdoor unit is larger than or equal to the preset difference value, the evaporator of the unit module can be judged to meet the defrosting condition.
FIG. 2 shows a defrosting determination flow chart of one embodiment of the invention.
After the heating operation of each unit module of the water-cooling air conditioning system is started, detecting the accumulated operation time Ty of the compressor of each unit module, the water outlet temperature Tc of the outdoor unit, the outdoor environment temperature TH and the defrosting temperature Th respectively, and starting to defrost if the following three conditions are met simultaneously:
Time conditions: ty is more than or equal to t1min; t1 is a preset run time.
Water temperature conditions: continuously detecting Tc not less than a ℃ for 10 seconds; a is the preset outlet water temperature.
Temperature conditions: TH-Th is more than or equal to b ℃.
If the unit module 1A meets the defrosting condition at first, the unit module 1A controls the corresponding three-way valve to change direction, and at the moment, the waterway of the unit module 1A exchanges heat with the heat preservation water tank. The unit module 1A starts defrosting, and if the continuous 10s detects that the defrosting temperature Th of the evaporator of the unit module 1A is more than or equal to 20 ℃ or the water outlet temperature Tc of the unit module 1A is less than or equal to 5 ℃, the unit module 1A exits defrosting.
The unit module 1A needing to exit defrosting controls the four-way valve to change direction, and meanwhile, the corresponding three-way valve changes direction, and the waterway of the unit module 1A is communicated with the main water inlet pipe and the main water outlet pipe again to participate in the heating process of the user side. The next round of defrosting determination may then begin.
The numerical values recited in the embodiment of fig. 2 are only for illustrating the concept of the technical solution of the present invention, and those skilled in the art can flexibly adjust and change the specific vertical values recited in the present invention according to the specific situation, which are all included in the protection scope of the present invention.
The defrosting control method of the air conditioning system also comprises a control process of the heat exchange device capable of accumulating heat. When the outdoor unit meets the defrosting condition, the control of the heat exchange device capable of accumulating heat comprises the following steps.
Detecting the temperature of the heat storage liquid in the heat storage box of the heat exchange device capable of storing heat, directly starting defrosting if the temperature of the heat storage liquid is greater than or equal to the preset heat storage temperature, otherwise, controlling a heater of the heat exchange device capable of storing heat to heat the heat storage liquid, and starting defrosting after heating is completed.
Also taking a multi-module water-cooling air conditioning system as an example, when the heat storage tank adopts a heat preservation water tank and the heater comprises a solar water heater, controlling the heater of the heat exchange device capable of storing heat to heat the heat storage liquid comprises the following specific steps.
Detecting the outlet water temperature of the solar water heater;
If the water outlet temperature of the solar water heater is greater than or equal to the sum of the preset heat storage temperature and the first preset increment, controlling the solar water heater to circularly heat the heat preservation water tank until the water outlet temperature of the solar water heater is less than the preset heat storage temperature or the water temperature of the heat preservation water tank is greater than the sum of the preset heat storage temperature and the second preset increment, and completing heating;
If the water outlet temperature of the solar water heater is smaller than the sum of the preset heat storage temperature and the first preset increment, the non-frosted outdoor unit with the smallest deviation between the target water outlet temperature and the actual water outlet temperature is controlled to serve as a heater to supply heat for the heat preservation water tank, and when the water temperature of the heat preservation water tank is larger than the sum of the preset heat storage temperature and the second preset increment, heating is completed.
Fig. 3 shows a control flow diagram of a heat storable heat exchange device according to an embodiment of the present invention.
The water temperature Tx (the detection value of the first temperature sensor) of the heat-retaining water tank of the heat-storable heat exchange device, and the water outlet temperature Tr (the detection value of the second temperature sensor) of the solar water heater are detected.
When the evaporator of the unit module needs defrosting, if the water temperature of the heat preservation water tank is larger than or equal to the preset heat storage temperature, tx is larger than or equal to t, t is the preset heat storage temperature, heating is not needed at this time, all valves of the solar water heater are closed, the corresponding unit module directly controls the corresponding three-way valve to change direction, and defrosting is performed through heat accumulated by the heat preservation water tank in the heat-storable heat exchange device.
When the evaporator of the unit module needs defrosting, but at the moment, the water temperature of the heat preservation water tank is smaller than the preset heat storage temperature, tx < t, t is the preset heat storage temperature, if at the moment, the water outlet temperature of the solar water heater is larger than or equal to the sum of the preset heat storage temperature and a first preset increment, for example Tr is larger than or equal to t+3, the water inlet two-way valve and the water outlet two-way valve of the solar water heater are opened, the water pump is opened simultaneously, heat is continuously supplied to the heat preservation water tank, and when the water outlet temperature Tr < t of the solar water heater or the water temperature Tx > ta of the heat preservation water tank, the heat supply of the solar water heater is stopped. ta is specifically the sum of the preset heat storage temperature plus a second preset increment, for example ta=t+5.
When the evaporator of the unit module needs defrosting, but at the moment, the water temperature of the heat preservation water tank is smaller than the preset heat storage temperature, tx is smaller than t, the vertical temperature of the solar water heater is also smaller than the sum of the preset heat storage temperature and the first preset increment, tr is smaller than t+3, the heating requirement cannot be met, and at the moment, the unit module with the most allowance can be selected. For example, an outdoor unit (unit module) with the minimum deviation between the target water outlet temperature and the actual water outlet temperature and without defrosting is selected as a heater, and the three-way valve corresponding to the unit module with the most allowance is controlled to change direction, so that the unit module is disconnected from the total water inlet pipe and the total water outlet pipe, hot water of the unit module enters a heat-accumulating heat exchange device through the three-way valve to heat water in a heat-preserving water tank, and then enters the total water outlet pipe from the three-way valve at the other end.
In one embodiment, t may be 45 ℃.
According to the technical scheme, continuous heating can be realized while defrosting is performed, the influence on temperature fluctuation of a use side is little, and the comfort experience of a user is improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. An air conditioning system, comprising: the heat exchange device comprises a unit circulation pipeline, at least one heat-accumulating heat exchange device and a plurality of parallel outdoor units, wherein the outdoor units are respectively connected with the unit circulation pipeline and the heat-accumulating heat exchange device through valves;
The air conditioning system is a water-cooling air conditioning system and comprises a plurality of unit modules, each unit module is called an outdoor unit, a set of circulating pipelines are arranged in each unit module, and each circulating pipeline comprises a compressor, a condenser, an electronic expansion valve and an evaporator which form refrigerant circulation;
when the unit module heats normally, the unit module is communicated with a unit circulation pipeline and disconnected with the heat-accumulating heat exchange device;
When the unit is modularized, the unit module controls the condenser to be changed into an evaporator, and the evaporator is disconnected with the unit circulating pipeline and is communicated with the heat-storable heat exchange device, and defrosting is performed through heat accumulated in the heat-storable heat exchange device;
The unit circulation pipeline comprises a total water outlet pipe for collecting the water outlet pipes of at least one outdoor unit and a total water inlet pipe for shunting the water inlet pipes of the at least one outdoor unit.
2. The air conditioning system of claim 1, wherein the heat storable heat exchanging device comprises: the heat storage box is provided with a heater for providing heat for the heat storage box and a heat exchange pipeline which is arranged in the heat storage box and exchanges heat with heat storage liquid in the heat storage box;
When the outdoor unit is communicated with the heat-accumulating heat exchange device, a water inlet pipe and a water outlet pipe of the outdoor unit are connected with the heat exchange pipeline in series.
3. The air conditioning system of claim 2, wherein the heat storage tank is a holding tank.
4. An air conditioning system as set forth in claim 3 wherein said heater comprises a solar water heater.
5. The air conditioning system according to claim 2, wherein if the temperature fluctuation of the use side of the air conditioning system is within a preset fluctuation range when the non-frosted outdoor unit is disconnected from the unit circulation line, the non-frosted outdoor unit is communicated with the heat-storable heat exchange device to be used as the heater.
6. An air conditioning system as claimed in any of claims 1 to 5, wherein the valve is a three-way valve.
7. A defrosting control method of an air conditioning system according to any one of claims 1 to 6, comprising:
Detecting whether the outdoor unit meets defrosting conditions;
And if the outdoor unit meets the defrosting condition, controlling the corresponding valve to enable the outdoor unit to serve as a unit module to convert the condenser into an evaporator, wherein the evaporator is disconnected with the unit circulation pipeline and is communicated with the heat-storable heat exchange device, and defrosting is performed through heat accumulated in the heat-storable heat exchange device.
8. The defrosting control method of an air conditioning system according to claim 7, wherein when the air conditioning system is a water-cooled air conditioning system, the defrosting condition includes:
The accumulated running time of the compressor of the outdoor unit after being started is larger than or equal to the preset running time, the water outlet temperature of the outdoor unit is larger than or equal to the preset water outlet temperature when the heating mode is detected for a plurality of times within a certain period of time, and the difference value of the outdoor environment temperature minus the fin temperature of the outdoor unit is larger than or equal to the preset difference value.
9. The defrosting control method of an air conditioning system according to claim 7, wherein when the outdoor unit satisfies a defrosting condition, the control of the heat exchanging arrangement that can store heat includes:
Detecting the temperature of the heat storage liquid in the heat storage box of the heat exchange device capable of storing heat, directly starting defrosting if the temperature of the heat storage liquid is greater than or equal to the preset heat storage temperature, otherwise, controlling a heater of the heat exchange device capable of storing heat to heat the heat storage liquid, and starting defrosting after heating is completed.
10. The defrosting control method of an air conditioning system according to claim 9, wherein when the air conditioning system is a multi-module water-cooled air conditioning system, the heat storage tank is a heat preservation water tank, and the heater includes a solar water heater, controlling the heater of the heat storable heat exchanging device to heat the heat storage liquid includes:
detecting the outlet water temperature of the solar water heater;
If the water outlet temperature of the solar water heater is greater than or equal to the sum of the preset heat storage temperature plus the first preset increment, the solar water heater is controlled to circularly heat the heat preservation water tank until the water outlet temperature of the solar water heater is less than the preset heat storage temperature, or the water temperature of the heat preservation water tank is greater than the sum of the preset heat storage temperature plus the second preset increment, and heating is completed;
If the water outlet temperature of the solar water heater is smaller than the sum of the preset heat storage temperature and the first preset increment, controlling an outdoor unit with the minimum deviation between the target water outlet temperature and the actual water outlet temperature and without defrosting to serve as a heater to supply heat for the heat preservation water tank, and finishing heating when the water temperature of the heat preservation water tank is larger than the sum of the preset heat storage temperature and the second preset increment.
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Citations (11)
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