CN112611073A - Air conditioning system and defrosting control method, storage medium and control device thereof - Google Patents
Air conditioning system and defrosting control method, storage medium and control device thereof Download PDFInfo
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- CN112611073A CN112611073A CN202011381460.5A CN202011381460A CN112611073A CN 112611073 A CN112611073 A CN 112611073A CN 202011381460 A CN202011381460 A CN 202011381460A CN 112611073 A CN112611073 A CN 112611073A
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- 238000010257 thawing Methods 0.000 title claims abstract description 89
- 238000004378 air conditioning Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000003507 refrigerant Substances 0.000 claims abstract description 64
- 239000013589 supplement Substances 0.000 claims abstract description 11
- 230000001502 supplementing effect Effects 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 31
- 239000007788 liquid Substances 0.000 description 17
- 238000001816 cooling Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000004590 computer program Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Classifications
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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
- F24F11/50—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—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
- 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
- F24F11/873—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling refrigerant heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
Abstract
The invention relates to the technical field of air conditioners, and particularly provides an air conditioning system, a defrosting control method, a storage medium and a control device thereof, wherein the air conditioning system comprises a compressor, a pipeline connected to a return air port of the compressor is provided with a heater, and the control method comprises the following steps: placing the air conditioning system in a defrost mode; under the condition that the air-conditioning system is in a defrosting mode, supplementing target heat to a refrigerant at an air return port of a compressor; wherein: the target heat includes: a first quantity of heat obtained by: supplementing first heat in a mode of bypassing a part of high-temperature and high-pressure gaseous refrigerant at an exhaust port of a compressor to a pipeline of a return air port of the compressor; a second quantity of heat obtained by: the heater is made to supplement the second heat quantity in a manner of providing the second heat quantity in a set manner. By such an arrangement, the defrosting mode of the air conditioning system can be optimized.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system, a defrosting control method, a storage medium and a control device thereof.
Background
The air conditioning system mainly comprises a compressor forming a refrigerant main loop, an indoor heat exchanger, a throttling component and an outdoor heat exchanger, and air with proper temperature can be provided for an indoor space along with the phase change of the refrigerant through the circulating flow of the refrigerant in the loop formed by the compressor, a condenser, the throttling component, an evaporator and the compressor. When the air conditioning system operates in a heating mode in a low-temperature environment, the outdoor unit of the air conditioner located at the outdoor side is in a low-temperature high-humidity environment, so that when the air conditioning system operates in the low-temperature environment for a long time, frost is easily formed on the surface of the outdoor heat exchanger, and the heat exchange performance of the frosted outdoor heat exchanger is obviously reduced, so that the operation of the air conditioning system is influenced. Therefore, in order to ensure that the air conditioning system can normally operate, the frosted outdoor heat exchanger needs to be subjected to defrosting operation. For example, in the case where the air conditioning system is in a heating mode, the indoor heat exchanger functions as a condenser for distributing heat, and in the case where the air conditioning system is in a cooling mode, the indoor heat exchanger functions as an evaporator for distributing cooling. Air conditioning systems typically have a cooling mode and a heating mode,
at present, the defrosting mode of the air conditioning system mainly comprises bypass defrosting and reverse cycle defrosting, wherein: 1) the bypass defrosting is realized by adding a branch which is used for defrosting independently, and on the premise of not changing a heating mode, a part of refrigerant is used for defrosting, so that the outdoor heat exchanger is defrosted on the premise of not changing the current heating mode of the air conditioning system; 2) the reverse cycle defrosting is to switch the current heating mode to the cooling mode briefly through a four-way reversing valve, so as to remove the frost layer on the surface of the outdoor heat exchanger. Bypass defrosting generally has the disadvantage of long defrosting time, and reverse cycle defrosting is widely adopted in the case of relatively high defrosting requirements due to the advantage of being able to thoroughly remove the frost layer on the surface of the outdoor heat exchanger.
For a conventional defrost operation, the longer the defrost time, the lower the ambient temperature, the longer the time that affects the heating experience of the user. In addition, under a low-temperature environment, a phenomenon of incomplete defrosting may occur, thereby continuously affecting the operation of the air conditioning system after defrosting is finished. For supercritical CO2In the case of an air conditioning system, since a general four-way reversing valve cannot withstand an extremely high pressure of the air conditioning system, a defrosting flow path control of the air conditioning system cannot be realized by switching by means of the four-way reversing valve. In addition, the reverse cycle defrosting, which simply uses the four-way selector valve for switching, is accompanied by a change of the originally heated indoor space to cooling, and thus belongs to a defrosting method on the premise of sacrificing the heating experience of the user.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
Considering that "control of a defrosting flow path of an air conditioning system by reversing by means of a four-way valve" is impossible and "reverse cycle defrosting simply using switching of a four-way reversing valve belongs to two factors of a defrosting manner premised on sacrificing a heating experience of a user", a first aspect of the present invention provides a defrosting control method of an air conditioning system including a compressor on a pipe connected to a return port of which a heater is arranged, the control method including: placing the air conditioning system in a defrost mode; under the condition that the air-conditioning system is in a defrosting mode, supplementing target heat to a refrigerant at an air return port of a compressor; wherein: the target heat includes: a first quantity of heat obtained by: supplementing a first heat quantity to a refrigerant at an air return port of a compressor by bypassing a part of high-temperature and high-pressure gaseous refrigerant at an air exhaust port of the compressor to a pipeline of the air return port of the compressor; a second quantity of heat obtained by: and enabling the heater to provide second heat in a set mode, so as to supplement the second heat to the refrigerant at the air return port of the compressor.
By such an arrangement, the defrosting mode of the air conditioning system can be optimized.
Specifically, the second heat quantity is supplied in a set manner, so that the target heat quantity formed by converging the first heat quantity and the second heat quantity can better meet the heat supplement demand of the refrigerant entering the air return port of the compressor in the defrosting mode. On the basis, the defrosting mode of the air conditioning system can be optimized by adjusting the target heat. The set mode can be as follows: the power of the heater is kept unchanged, but certain heat is only supplemented to the refrigerant at the air return port of the compressor at intervals; and the like.
With regard to the defrosting control method of the air conditioning system, in a possible embodiment, the step of causing the heater to provide the second heat in a set manner includes: the value of the second heat amount is adjusted in a set manner so that the defrosting mode based on the target heat amount can be completed within the set defrosting time period.
With this arrangement, the defrosting time period of the air conditioning system can be shortened.
With regard to the defrosting control method of the air conditioning system, in a possible embodiment, the "adjusting the value of the second heat amount in a set manner" includes: and adjusting the value of the second heat according to the ambient temperature.
With this arrangement, the amount of the outside referred to when adjusting the second heat amount is given.
For the defrosting control method of the air conditioning system, in a possible implementation manner, the "adjusting the value of the second heat according to the ambient temperature" specifically includes:
Q＝q*W (1)
q＝0.029239766*(0.01474*T2-0.545397*T+1.035563) (2)
wherein Q is a second heat quantity, and the unit is kW; t is ambient temperature in units of; q is the heating quantity which needs to be supplemented during defrosting according to the unit rated heating quantity, and the unit is kW/kW; w is the rated heating capacity of the air conditioning system, and the unit is kW.
In one possible embodiment, the air conditioning system includes a valve set, and the "putting the air conditioning system in the defrosting mode" includes: and at least adjusting the on-off state of each valve in the valve group so as to enable the air conditioning system to be in a defrosting mode.
With this arrangement, a class of implementations is presented for placing the air conditioning system in a defrost mode. Specifically, the method is realized by adding a valve group.
It is understood that, under the premise of enabling the air conditioning system to be in the defrosting mode, the number, the setting position, the corresponding switching logic and the like of the valves can be selected by those skilled in the art according to actual conditions.
In a possible implementation manner, the air conditioning system comprises a throttling component, an indoor heat exchanger and an outdoor heat exchanger, the valve set comprises a first valve, a second valve, a third valve and a fourth valve, a first connecting pipeline is arranged between the exhaust port of the compressor and a pipeline for connecting the throttling component and the outdoor heat exchanger, and the first valve is arranged on the first connecting pipeline; a second connecting pipeline is arranged between the exhaust port of the compressor and the return port of the compressor, and the second valve is arranged on the second connecting pipeline; the third valve is arranged between a pipeline which is connected with the first valve and the second valve at the exhaust port of the compressor and the indoor heat exchanger; the fourth valve is arranged between the outdoor heat exchanger and the return air port of the compressor.
By this arrangement, a particular form of valve group is given.
In one possible embodiment, the "enabling the air conditioning system to be in the defrosting mode by adjusting the on-off state of each valve in the valve group" includes: the first, second and fourth valves are opened, the third valve is closed, and the throttling element is closed, thereby placing the air conditioning system in a defrost mode.
With this arrangement, a specific switch control logic corresponding to the valve group is given.
In addition, the air conditioning system is in a defrosting mode on the premise that the heating cycle is suspended by closing the throttling component. In this way, the influence of the defrosting process on the heating experience of the indoor space can be indirectly reduced. Specifically, at least no cooling energy is delivered to the indoor space during defrost mode operation as in the reverse cycle defrost mode.
A second aspect of the present invention provides a computer readable storage medium having stored therein a plurality of program codes adapted to be loaded and executed by a processor to perform the defrost control method of an air conditioning system as set forth in any of the preceding claims.
It is understood that the computer readable storage medium has all the technical effects of any one of the above-mentioned defrosting control methods of the air conditioning system, and will not be described herein again.
A third aspect of the present invention provides a control apparatus including a processor capable of calling a program and executing the defrosting control method of an air conditioning system according to any one of the foregoing.
It can be understood that the control device has all the technical effects of any one of the above-mentioned defrosting control methods of the air conditioning system, and the details are not repeated herein.
A fourth aspect of the present invention provides an air conditioning system comprising a control module configured to execute the defrosting control method of the air conditioning system according to any one of the preceding claims.
It can be understood that the air conditioning system has all the technical effects of any one of the above-mentioned defrosting control methods of the air conditioning system, and the details are not repeated herein.
Drawings
Supercritical CO with reference to the following figures and with reference to air conditioning systems2The invention is described by way of example of a chiller. In the drawings:
fig. 1 is a schematic structural diagram of a water chiller according to an embodiment of the present invention.
List of reference numerals:
1. a compressor; 2. a gas-liquid separator; 3. an indoor heat exchanger; 4. an electronic expansion valve; 5. an outdoor heat exchanger; 61. a first valve; 62. a second valve; 63. a third valve; 64. and a fourth valve.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of protection of the present invention and the like.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, while numerous specific details are set forth in the following description in order to provide a better understanding of the invention, it will be apparent to those skilled in the art that the invention may be practiced without some of these specific details. In some instances, cooktop principles and the like well known to those skilled in the art have not been described in detail in order to highlight the subject matter of the invention.
The air conditioning system mainly comprises a compressor forming a refrigerant main loop, an indoor heat exchanger, an outdoor heat exchanger, a throttling component (such as a capillary tube, an electronic expansion valve and the like) and a four-way valve, the air conditioning system can have a conventional refrigeration mode and a heating mode by switching the communication mode of the four-way valve, and cold/heat can be distributed to the surface of the indoor heat exchanger along with the phase change of the refrigerant through the circulating flow of the refrigerant in a loop formed by the compressor, the condenser, the throttling component, the evaporator and the compressor. Specifically, the method comprises the following steps: when the refrigerant circulates along the circuit of the compressor → the indoor heat exchanger → the outdoor heat exchanger → the compressor, the air conditioning system is in a heating cycle. Namely: under the condition that the air conditioning system is in a heating mode, the indoor heat exchanger is used as a condenser for distributing heat; when the refrigerant circulates along the circuit of the compressor → the outdoor heat exchanger → the indoor heat exchanger → the compressor, the air conditioning system is in a refrigeration cycle. Namely: in the case of an air conditioning system in a cooling mode, the indoor heat exchanger acts as an evaporator for distributing cooling energy.
Supercritical CO2A water chiller is a particular form of application for air conditioning systems in which the delivery of heat and cold to an indoor space is accomplished primarily with water as the medium. Meanwhile, the refrigerant of the invention is natural working medium CO2Therefore, the four-way valve is omitted and the water chilling unit is limited to be operated only in a heating mode, namely, the indoor heat exchanger corresponding to the indoor space is a condenser for emitting heat, and the outdoor heat exchanger is an evaporator. The condenser and the evaporator in the refrigerant main loop are respectively provided with a refrigerant coil corresponding to the refrigerant and a water coil corresponding to water, the refrigerant coil is mainly used for participating in forming the refrigerant main loop, and the water coil is mainly used for participating in forming a water circulation loop, so that the sustainability of the refrigerant main loop is ensured on one hand, and the heat/cold distribution to a target side is realized on the other hand. The refrigerant coil and the water coil are arranged in a manner of exchanging heat, such as overlapping and the like. Specifically, the method comprises the following steps:
the refrigerant flowing through the refrigerant coil pipe and the water flowing through the water coil pipe exchange heat, so that heat/cold generated by the phase change of the refrigerant is transferred into the water. Such as the condenser and the evaporator, may be of a shell-and-tube heat exchanger or a double-tube heat exchanger, etc. The two ends of the water coil of the condenser are respectively connected to the first target side, so that a heat circulation system capable of distributing heat to a user side is formed. For example, hot water supply, heating supply and the like can be realized for the user end; both ends of the water coil of the evaporator are connected to the second target side, respectively, to form a cold circulation system capable of distributing cold. For example, cold energy can be supplied to a freezing space or the like.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a water chilling unit according to an embodiment of the present invention. As shown in fig. 1, the chiller includes a compressor 1, a gas-liquid separator 2, an indoor heat exchanger 3, an electronic expansion valve 4 as a throttle member, and an outdoor heat exchanger 5, and includes a valve group. The valve group is arranged to have the following functions: when the outdoor heat exchanger needs to be defrosted, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor is guided to the outdoor heat exchanger to be defrosted, and meanwhile, a part of the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor is bypassed to the air return port of the compressor to improve the temperature of the refrigerant at the air return port.
With further reference to FIG. 1, the valve set includes a first valve 61, a second valve 62, a third valve 63, and a fourth valve 64, e.g., all four valves are solenoid valves. Specifically, the method comprises the following steps: a first connecting pipeline is arranged between an exhaust port of the compressor and a pipeline for connecting the electromagnetic expansion valve and the outdoor heat exchanger, and a first valve is arranged on the first connecting pipeline; a second connecting pipeline is arranged between the exhaust port of the compressor and the inlet of the gas-liquid separator, and a second valve is arranged on the second connecting pipeline; a third valve is arranged between a pipeline connecting the first valve and the second valve at the air outlet of the compressor and the indoor heat exchanger; a fourth valve is arranged between the outdoor heat exchanger and the gas-liquid separator, a heater is arranged between the gas-liquid separator and the fourth valve, and one end of the second connecting pipeline, which corresponds to the inlet of the gas-liquid separator, is specifically arranged between the heater and the inlet of the gas-liquid separator.
With the above configuration, when the first valve and the second valve are closed and the third valve and the fourth valve are opened, the water chiller according to the present invention can be in the normal heating mode (heating cycle), during which the electronic expansion valve is normally opened and the water chiller heats normally. The flow direction of the refrigerant is shown by the dotted arrows in the figure. It can be seen that the chiller of the present invention behaves as a conventional chiller with the first and second valves closed and the third and fourth valves open.
Based on the structure, the first valve, the second valve and the fourth valve are opened, the third valve is closed, the water chilling unit can be in the defrosting mode, the electronic expansion valve is closed, and the heater provides heat as required. The flow direction of the refrigerant is shown by the dotted arrows in the figure. Specifically, the method comprises the following steps: the high-temperature high-pressure gaseous refrigerant discharged from the exhaust port of the compressor is divided into two paths, wherein: one path of the refrigerant is directly communicated to the outdoor heat exchanger through a first valve (fully opened), so that heat carried by the high-temperature and high-pressure gaseous refrigerant is delivered to the outdoor heat exchanger to be defrosted, and then the refrigerant is throttled into low-pressure gaseous refrigerant through a fourth valve, and the low-temperature and low-pressure gaseous refrigerant is heated by a heater and then reaches an inlet of a gas-liquid separator; the other path is bypassed to the inlet of the gas-liquid separator through a second valve. The two paths of refrigerants are converged in front of an inlet of the gas-liquid separator, are subjected to near-term gas-liquid separation by the gas-liquid separator and then enter the compressor through a return air port of the compressor. Thus completing one cycle.
It can be seen that the water chilling unit provided by the invention realizes defrosting operation of the outdoor heat exchanger by means of defrosting before throttling based on the valve set. Also, during defrosting, the indoor heat exchanger does not participate in the circulation of the refrigerant due to the closing of the electronic expansion valve.
On the basis, the water chilling unit is provided with the heater at the inlet of the gas-liquid separator, and the heater can supplement heat for the refrigerant at the air return port, so that the heat supplement realized by the valve group and the heat supplement realized by the heater can be combined, and the defrosting quality of the water chilling unit is improved.
Because the common electric heating wire heater has certain potential safety hazard when realizing high-power heating on a short pipe section, the heater of the invention adopts a thick film heater or an electromagnetic heater, and heats a refrigerant pipeline at the upstream of the gas-liquid separator through the heater so as to supplement heat for the refrigerant.
However, when the water chilling unit operates in a low-temperature working condition, the reason for incomplete defrosting is mainly that the temperature at the air return port of the compressor is too low, so that the efficiency of the compressor is reduced, and the defrosting effect is poor. Aiming at the problem, the water chilling unit bypasses a part of high-temperature and high-pressure gaseous refrigerant to the air return port of the compressor by arranging the second valve, so that the temperature of the refrigerant at the air return port of the compressor is increased to a certain extent. On the other hand, the heater is arranged at the air return port of the compressor, so that the low-temperature and low-pressure gaseous refrigerant entering the compressor can be heated. In addition, by controlling the heating power of the heater, it is possible to better meet the heat supply actually required for the low-temperature and low-pressure gaseous refrigerant. In short, by combining the bypass heat (the heat is approximately constant) and the supplementary heat of the heater (the heat can be adjusted as required), the risk of liquid entrainment at the return port of the compressor can be effectively prevented, the efficiency of the compressor is improved, and finally the defrosting effect is more complete by combining the refrigerant circulation.
In other words, the present invention can adjust the heating power of the heater by the ambient temperature to increase or decrease the amount of heat supplied to the heater, thereby making it possible to substantially match the defrosting time at different ambient temperatures. The increase and decrease control mode specifically comprises the following steps:
referring to fig. 1, table 1 shows the amount of supplemental heating (kW) per rated heating capacity (per kW) at different ambient temperatures. On the basis, the total heating amount to be supplemented by the heater for defrosting can be calculated according to the formula (1) (it can be understood that the heat amount required by the refrigerant at the air return port of the compressor during defrosting can be obtained through experiments and analysis, in the present invention, the part of heat amount is formed by the aforementioned bypass heat amount (hereinafter, first heat amount) and the current total heating amount supplemented by the heater (hereinafter, second heat amount), and obviously, the "total heating amount" herein is the heat amount obtained by removing the aforementioned bypass heat amount from the heat amount required by the refrigerant at the air return port of the compressor during defrosting, that is, the second heat amount).
TABLE 1 heating capacity to be supplemented per rated heating capacity at different ambient temperatures
| Ambient temperature | Heating capacity to be supplemented per rated |
| 2 | 0 |
| -7 | 0.163 |
| -12 | 0.284 |
| -15 | 0.366 |
| -20 | 0.522 |
Based on this, the inventor fits a curve corresponding to the formula (2) of the heating amount required to be supplemented by the heater at different ambient temperatures through experiments and analysis by combining the relationship between the defrosting energy consumption and the ambient temperature and taking the defrosting time as the target factor to be sought.
Q＝q*W (1)
q＝0.029239766*(0.01474*T2-0.545397*T+1.035563) (2)
Wherein T is the ambient temperature and the unit is; q is the heating quantity which needs to be supplemented during defrosting in unit rated heating quantity (kW), and the unit is kW/kW; q is the total heating amount to be supplemented for defrosting, and the unit is kW; w is the rated heating capacity of the air conditioning system, and the unit is kW.
It should be noted that, especially for the formula (2), since the formula corresponds to a curve fitted according to a relationship between numerical values, the formula (2) should be understood as: on the premise of carrying out value taking according to the unit of the parameter, the left side and the right side of the formula are equal in value.
Experimental data show that when the heater supplements heat to the refrigerant at the air return port of the compressor according to the curve corresponding to the formula (2), the defrosting time is about 600s (i.e. 10min) when the ambient temperature changes. Thus, even when the water chiller is in a low temperature environment such as winter, the defrosting quality of the complete defrosting and the stable defrosting time required for basically maintaining the defrosting can be ensured.
It can be seen that, in the water chilling unit of the invention, through the arrangement of the valve set, on one hand, a part (most) of the high-temperature and high-pressure gaseous refrigerant discharged by the compressor is led to the outdoor heat exchanger so as to use the heat carried by the high-temperature and high-pressure gaseous refrigerant for defrosting operation of the outdoor heat exchanger, and on the other hand, the other part (less part) of the high-temperature and high-pressure gaseous refrigerant discharged by the compressor is bypassed to the air return port of the compressor, and the heat carried by the high-temperature and high-pressure gaseous refrigerant is used for heating the refrigerant entering the gas-liquid separator so as to improve the temperature. Meanwhile, the invention arranges the heater at the inlet of the gas-liquid separator and adjusts the heat supplement level of the heater, thereby seeking the combination of bypass and supplement heating and ensuring that stable defrosting effect and approximately same defrosting time can be obtained under different environmental temperatures.
Based on the specific valve group and the switch control logic thereof, and the fitting curve referred by the heater and the heat supplemented by the heater, the invention can realize the following defrosting control method of the water chilling unit, and the method specifically comprises the following steps:
s10, opening the first valve, the second valve and the fourth valve, closing the third valve, closing the electronic expansion valve, and enabling the water chilling unit to enter a defrosting mode on the premise of not sending cold to the indoor space;
s20, supplementing a first heat quantity to the refrigerant at the air return port of the compressor by adjusting the opening of the second electromagnetic valve;
s30, according to the detected ambient temperature, supplementing a second heat quantity to the refrigerant at the air return port of the compressor according to the formula (1) and the formula (2);
when the refrigerant at the air return port of the compressor has the first heat and the second heat (target heat) after being converged, the defrosting time can be about 10min as mentioned above while ensuring the defrosting quality.
Based on the defrosting control method of the water chilling unit, the water chilling unit further comprises a control module, and the control method can be carried out on the water chilling unit through the control module.
In the description of the present invention, a "module" or "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like.
It will be understood by those skilled in the art that all or part of the processes of the control method of the present invention may be implemented by a computer program, which can be stored in a computer-readable storage medium and can implement the steps of the above-mentioned method embodiments when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying said computer program code, media, usb disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunication signals, software distribution media, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
Further, it should be understood that, since the control module is configured only to illustrate the functional units of the system of the present invention, the physical device corresponding to the control module may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of control modules is only exemplary.
Those skilled in the art will appreciate that the control module may be adaptively split according to the actual situation. The specific splitting of the control module does not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solution after splitting will fall into the protection scope of the present invention.
It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art may understand that, in order to achieve the effect of the present invention, different steps do not have to be executed in such a sequence, and may be executed simultaneously or in other sequences, and some steps may be added, replaced or omitted, and these changes are within the protection scope of the present invention.
It should be noted that, although the control method configured as described above is described as an example, those skilled in the art will appreciate that the present invention should not be limited thereto. In fact, the user can flexibly adjust the relevant steps, parameters in the steps and other elements according to the situations such as actual application scenes and the like.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrosting control method of an air conditioning system including a compressor, a heater being disposed on a pipe connected to a return port of the compressor, the control method comprising:
placing the air conditioning system in a defrost mode;
under the condition that the air-conditioning system is in a defrosting mode, supplementing target heat to a refrigerant at an air return port of a compressor; wherein:
the target heat includes:
a first quantity of heat obtained by:
supplementing a first heat quantity to a refrigerant at an air return port of a compressor by bypassing a part of high-temperature and high-pressure gaseous refrigerant at an air exhaust port of the compressor to a pipeline of the air return port of the compressor;
a second quantity of heat obtained by:
and enabling the heater to provide second heat in a set mode, so as to supplement the second heat to the refrigerant at the air return port of the compressor.
2. The defrost control method for an air conditioning system according to claim 1, wherein said causing the heater to provide the second heat in a set manner comprises:
the value of the second heat amount is adjusted in a set manner so that the defrosting mode based on the target heat amount can be completed within the set defrosting time period.
3. The defrost control method of an air conditioning system according to claim 2, wherein said adjusting the value of the second heat in a set manner comprises:
and adjusting the value of the second heat according to the ambient temperature.
4. The defrosting control method of an air conditioning system according to claim 3, wherein the "adjusting the value of the second heat according to the ambient temperature" is specifically:
Q＝q*W (1)
q＝0.029239766*(0.01474*T2-0.545397*T+1.035563) (2)
wherein Q is a second heat quantity, and the unit is kW; t is ambient temperature in units of; q is the heating quantity which needs to be supplemented during defrosting according to the unit rated heating quantity, and the unit is kW/kW; w is the rated heating capacity of the air conditioning system, and the unit is kW.
5. The defrosting control method of an air conditioning system according to any one of claims 1 to 4, wherein the air conditioning system includes a valve group, and the "putting the air conditioning system in the defrosting mode" includes:
and at least adjusting the on-off state of each valve in the valve group so as to enable the air conditioning system to be in a defrosting mode.
6. The defrost control method of an air conditioning system of claim 5, wherein the air conditioning system includes a throttle member, an indoor heat exchanger, and an outdoor heat exchanger, the valve set includes a first valve, a second valve, a third valve, and a fourth valve,
a first connecting pipeline is arranged between the exhaust port of the compressor and a pipeline for connecting the throttling component and the outdoor heat exchanger, and the first valve is arranged on the first connecting pipeline;
a second connecting pipeline is arranged between the exhaust port of the compressor and the return port of the compressor, and the second valve is arranged on the second connecting pipeline;
the third valve is arranged between a pipeline which is connected with the first valve and the second valve at the exhaust port of the compressor and the indoor heat exchanger;
the fourth valve is arranged between the outdoor heat exchanger and the return air port of the compressor.
7. The defrost control method for an air conditioning system of claim 6, wherein said placing the air conditioning system in the defrost mode by adjusting at least the on/off states of the valves of said valve group comprises:
the first, second and fourth valves are opened, the third valve is closed, and the throttling element is closed, thereby placing the air conditioning system in a defrost mode.
8. A computer readable storage medium having stored therein a plurality of program codes, characterized in that the program codes are adapted to be loaded and executed by a processor to perform the defrost control method of the air conditioning system of any of claims 1 to 7.
9. A control apparatus characterized by comprising a processor capable of calling a program and executing the defrosting control method of an air conditioning system according to any one of claims 1 to 7.
10. An air conditioning system, characterized by comprising a control module for performing the defrosting control method of the air conditioning system of any one of claims 1 to 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011381460.5A CN112611073A (en) | 2020-11-30 | 2020-11-30 | Air conditioning system and defrosting control method, storage medium and control device thereof |
| PCT/CN2021/101935 WO2022068281A1 (en) | 2020-11-30 | 2021-06-24 | Air conditioning system and defrosting control method therefor, and storage medium and control apparatus |
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| CN202011381460.5A CN112611073A (en) | 2020-11-30 | 2020-11-30 | Air conditioning system and defrosting control method, storage medium and control device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113639491A (en) * | 2021-07-07 | 2021-11-12 | 青岛海尔空调电子有限公司 | Method and device for defrosting heat pump equipment and hot water unit |
| WO2022068281A1 (en) * | 2020-11-30 | 2022-04-07 | 青岛海尔空调电子有限公司 | Air conditioning system and defrosting control method therefor, and storage medium and control apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115950051A (en) * | 2023-01-29 | 2023-04-11 | 宁波奥克斯电气股份有限公司 | Air conditioner defrosting structure and defrosting method thereof |
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| WO2022068281A1 (en) | 2022-04-07 |
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