Fresh air constant temperature air conditioner control method, control device and fresh air constant temperature air conditioner

Abstract

The present invention provides a fresh air constant temperature air conditioner control method, a control device, and a fresh air constant temperature air conditioner, which relate to the technical field of fresh air air conditioners and solve the problem of poor temperature control level of traditional fresh air equipment. The fresh air constant temperature air conditioner in the fresh air constant temperature air conditioner control method includes a fresh air processing unit and an outdoor unit. The fresh air processing unit includes a fresh air heat exchanger and a heating component. The number of outdoor units is at least two, and all outdoor units can be connected to the fresh air processing unit through the fresh air heat exchanger. The control method includes: obtaining the difference between the set temperature and the outdoor temperature; and adjusting the operating mode of the air conditioner according to the difference. When the difference is greater than or equal to the first temperature threshold, the air conditioner is controlled to operate in the heating mode; when the difference is between the second temperature threshold and the third temperature threshold, the air conditioner is controlled to operate in the transition mode; when the difference is less than or equal to the fourth temperature threshold, the air conditioner is controlled to operate in the cooling mode.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air air conditioners, and in particular to a fresh air constant temperature air conditioner control method, a control device, and a fresh air constant temperature air conditioner. Background Art

[0002] In poultry farming, precise temperature control is required to ensure healthy hatching and rearing of poultry, typically set at 25 ± 2°C. To improve comfort, prevent the accumulation of toxic gases, and meet environmental protection requirements, fresh air systems must be installed in the breeding room. Traditional constant temperature and humidity units only control the return air temperature and are unable to adapt to this fresh air environment.

[0003] Currently, the fresh air fans on the market are mainly used in home or commercial environments. Their ability to regulate temperature is not precise enough and it is difficult to adapt to breeding needs.

[0004] In order to improve the temperature control capability of fresh air air conditioners and ensure a constant temperature environment indoors, it is necessary to develop a new type of fresh air constant temperature air conditioner control method, control device and fresh air constant temperature air conditioner. Summary of the Invention

[0005] The present invention aims to provide a control method, control device, and fresh air constant temperature air conditioner to address the existing problem of large temperature fluctuations and difficulty in maintaining constant temperature in fresh air air conditioners. The various technical effects achieved by the preferred technical solutions provided by the present invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The present invention provides a method for controlling a fresh air constant temperature air conditioner, wherein the fresh air constant temperature air conditioner comprises a fresh air handler and an outdoor unit, the fresh air handler comprises a fresh air heat exchanger and a heating assembly, the number of the outdoor units is at least two and all the outdoor units can be connected to the fresh air handler via the fresh air heat exchanger;

[0008] The control method includes:

[0009] Get the difference between the set temperature and the outdoor temperature;

[0010] The operation mode of the fresh air constant temperature air conditioner is adjusted according to the difference.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] As a further improvement of the present invention, adjusting the operation mode of the fresh air constant temperature air conditioner according to the difference includes:

[0013] When the difference is greater than or equal to a first temperature threshold, controlling the fresh air constant temperature air conditioner to operate in a heating mode;

[0014] When the difference is between the second temperature threshold and the third temperature threshold, controlling the fresh air constant temperature air conditioner to operate in a transition mode;

[0015] When the difference is less than or equal to a fourth temperature threshold, the fresh air constant temperature air conditioner is controlled to operate in a cooling mode.

[0016] As a further improvement of the present invention, the heating mode includes:

[0017] When the difference is greater than or equal to a fifth temperature threshold, operating the first heating mode;

[0018] When the difference is less than a fifth temperature threshold, operating the second heating mode;

[0019] The fifth temperature threshold is greater than the first temperature threshold.

[0020] As a further improvement of the present invention,

[0021] The first heating mode includes simultaneously starting the outdoor unit and the heating assembly;

[0022] The second heating mode includes starting only the outdoor unit;

[0023] The outdoor unit delivers heat to the room when started.

[0024] As a further improvement of the present invention, the first heating mode further includes:

[0025] Obtaining the heating load of the fresh air constant temperature air conditioner, the heating output load of the outdoor unit, and the heating output load of the heating component;

[0026] If the sum of the heating output loads of the outdoor unit and the heating component is not less than the heating load after the outdoor unit has been running for T1 time, the fresh air constant temperature air conditioner is controlled to enter the second heating mode.

[0027] As a further improvement of the present invention, the second heating mode further includes:

[0028] Obtaining the heating load of the fresh air constant temperature air conditioner and the heating output load of the outdoor unit;

[0029] If the heating output load of the outdoor unit is less than the heating load after the outdoor unit has been running for T1 time, the fresh air constant temperature air conditioner is controlled to enter the first heating mode.

[0030] As a further improvement of the present invention,

[0031] Obtaining the evaporation pressure value of the outdoor unit after running for T2 time;

[0032] If the evaporation pressure value of the outdoor unit is between the first set evaporation value and the second set evaporation value, controlling the outdoor unit to maintain the current heating output;

[0033] If the evaporation pressure value of the outdoor unit is less than the first set evaporation pressure value, controlling the outdoor unit to increase the current heating output;

[0034] If the evaporation pressure value of the outdoor unit is less than the second set evaporation pressure value, the outdoor unit is controlled to reduce the current heating output.

[0035] As a further improvement of the present invention, the refrigeration mode includes:

[0036] When the difference is less than or equal to a sixth temperature threshold, operating the first cooling mode;

[0037] When the difference is greater than a sixth temperature threshold, running the second cooling mode;

[0038] The sixth temperature threshold is lower than the fourth temperature threshold.

[0039] As a further improvement of the present invention,

[0040] The first cooling mode includes starting only the outdoor unit;

[0041] The second cooling mode includes simultaneously starting the outdoor unit and the heating assembly;

[0042] The outdoor unit delivers cold air to the room when it is started.

[0043] As a further improvement of the present invention, the first refrigeration mode further includes:

[0044] Obtaining the cooling load of the fresh air constant temperature air conditioner and the cooling output load of the outdoor unit;

[0045] If the cooling output load of the outdoor unit is greater than the cooling load after the outdoor unit has been running for T1 time, the fresh air constant temperature air conditioner is controlled to enter the second cooling mode.

[0046] As a further improvement of the present invention, the second refrigeration mode further includes:

[0047] Obtaining the cooling load of the fresh air constant temperature air conditioner, the cooling output load of the outdoor unit, and the heating output load of the heating component;

[0048] If the difference between the cooling output load and the heating output load is less than the cooling load after the outdoor unit has been running for T1 time, the fresh air constant temperature air conditioner is controlled to enter the first cooling mode.

[0049] As a further improvement of the present invention,

[0050] Obtaining the evaporation pressure value of the outdoor unit after running for T2 time;

[0051] If the evaporation pressure value of the outdoor unit is between the first set evaporation value and the second set evaporation value, controlling the outdoor unit to maintain the current cooling output;

[0052] If the evaporation pressure value of the outdoor unit is less than the first set evaporation pressure value, controlling the outdoor unit to increase the current cooling output;

[0053] If the evaporation pressure value of the outdoor unit is less than the second set evaporation pressure value, the outdoor unit is controlled to reduce the current cooling output.

[0054] As a further improvement of the present invention, the transition mode includes starting only the outdoor units, at least one of the outdoor units delivering heat to the indoor space, and at least one of the outdoor units delivering cooling to the indoor space.

[0055] As a further improvement of the present invention,

[0056] Obtaining the load demand of the fresh air constant temperature air conditioner and the heating output load and cooling output load of the outdoor unit;

[0057] If the difference between the cooling output load and the heating output load is greater than the load requirement, increasing the heating output load or decreasing the cooling output load;

[0058] If the difference between the cooling output load and the heating output load is less than the load requirement, the cooling output load is increased or the heating output load is decreased.

[0059] The present invention also provides a fresh air constant temperature air conditioning control device, comprising:

[0060] An acquisition module, configured to acquire a difference between a set temperature and an outdoor temperature;

[0061] A control module is used to adjust the operation mode of the fresh air constant temperature air conditioner according to the difference obtained by the acquisition module.

[0062] The present invention also provides a fresh air constant temperature air conditioner, comprising:

[0063] One or more memories storing executable programs;

[0064] One or more processors are used to execute the executable program in the memory to implement the steps of any of the above methods.

[0065] Compared with the prior art, the technical solution provided by the preferred embodiment of the present invention has the following beneficial effects:

[0066] This solution can, under the condition of fresh air, perform different temperature control on the fresh air gas input from the outdoor to the indoor room by controlling the fresh air constant temperature air conditioner in different operating modes according to the difference between the outdoor temperature and the indoor temperature, thereby achieving the effect of maintaining a constant indoor temperature; wherein, at least two outdoor units located outdoors can achieve simultaneous cooling and heating, further ensuring a constant indoor temperature and avoiding large temperature fluctuations indoors; in addition, when executing the cooling mode or the heating mode, the indoor outlet air temperature can be increased by controlling the start or stop of the heating component located in the fresh air processing unit, thereby minimizing the supply air temperature difference. The above-mentioned heating component can play a role in precise temperature control, which can help improve the temperature control accuracy of the fresh air constant temperature air conditioner and maintain a constant indoor temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0068] Figure 1 This is a structural diagram of the fresh air constant temperature air conditioner of the present invention;

[0069] Figure 2 Schematic diagram of the flow of the fresh air constant temperature air conditioning control method of the present invention;

[0070] Figure 3 This is a working diagram of a certain embodiment of the fresh air constant temperature air conditioning control method of the present invention;

[0071] Figure 4 2 is a schematic diagram showing the operation of another embodiment of the fresh air constant temperature air conditioning control method of the present invention;

[0072] Figure 5 2 is a working diagram of another embodiment of the fresh air constant temperature air conditioning control method of the present invention;

[0073] Figure 6 It is a structural schematic diagram of the fresh air constant temperature air conditioning control device of the present invention.

[0074] In the figure: 1. Fresh air processing unit; 11. Fresh air heat exchanger; 12. Heating component; 13. Internal fan; 14. Fresh air temperature sensor; 15. Outlet air temperature sensor; 2. Outdoor unit; 21. Compressor; 22. Four-way valve; 23. Outdoor heat exchanger; 24. Outdoor environment temperature sensor; 100. Fresh air constant temperature air conditioning control device; 101. Acquisition module; 102. Control module. DETAILED DESCRIPTION

[0075] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0076] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0077] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0078] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0079] The present invention provides a control method, control device, and fresh air constant temperature air conditioner, wherein the fresh air constant temperature air conditioner includes at least two outdoor units 2 (the two units are not directly connected to each other). The two outdoor units 2 can be independently arranged in different housings, or can be fixed in the same housing in different layouts, such as vertical arrangement or left-right arrangement. The outdoor unit 2 in the fresh air constant temperature air conditioner is a heat pump unit.

[0080] Example 1:

[0081] This embodiment provides a fresh air constant temperature air conditioner, including a fresh air processing unit 1 and an outdoor unit 2, the fresh air processing unit 1 includes a fresh air heat exchanger 11 and a heating component 12, the number of outdoor units 2 is at least two and all outdoor units 2 can be connected to the fresh air processing unit 1 through the fresh air heat exchanger 11, such as Figure 1 shown.

[0082] The above-mentioned fresh air heat exchanger 11 can be divided into at least two parts in proportion, and different parts of the fresh air heat exchanger 11 can be connected to different outdoor units 2 respectively, thereby forming a dual-system air conditioner or a multi-system air conditioner.

[0083] In addition, the fresh air handling machine 1 can also include an internal fan 13, a fresh air temperature sensing package 14 and an outlet air temperature sensing package 15, wherein the internal fan 13 is used to deliver fresh air to the room, and the fresh air temperature sensing package 14 and the outlet air temperature sensing package 15 are respectively used to sense the temperature of the gas flowing into the fresh air handling machine 1 and the gas discharged through the internal fan 13.

[0084] The outdoor unit 2 is a heat pump unit, which includes a compressor 21, a four-way valve 22, an outdoor heat exchanger 23, an outdoor environment temperature sensor 24 and other structures.

[0085] It should be noted that the heating component 12 may be an electric heating device.

[0086] Example 2:

[0087] This embodiment provides a method for controlling a fresh air constant temperature air conditioner. Figure 2 The control method includes:

[0088] Step S1: Obtain the difference between the set temperature and the outdoor temperature;

[0089] Step S2: adjusting the operation mode of the fresh air constant temperature air conditioner according to the difference.

[0090] Since the fresh air constant temperature air conditioner includes an outdoor component that can input heat or cooling into the room as needed, and the heating component 12 within the fresh air handler 1 can also input heat into the room as needed, the temperature of the air entering the room through the fresh air handler 1 can be adjusted by controlling the operating mode of the fresh air constant temperature air conditioner. By controlling the temperature of the air entering the room, a constant indoor temperature effect can be achieved.

[0091] Specifically, the operation mode of the fresh air constant temperature air conditioner is adjusted according to the difference, including:

[0092] Step S21: When the difference is greater than or equal to the first temperature threshold, the fresh air constant temperature air conditioner is controlled to operate in a heating mode;

[0093] Step S22: When the difference is between the second temperature threshold and the third temperature threshold, the fresh air constant temperature air conditioner is controlled to operate in a transition mode;

[0094] Step S23: When the difference is less than or equal to the fourth temperature threshold, the fresh air constant temperature air conditioner is controlled to operate in a cooling mode.

[0095] The control method of the fresh air constant temperature air conditioner is described below according to the operating mode.

[0096] like Figure 3 As shown in the figure, when the fresh air constant temperature air conditioner operates in heating mode:

[0097] A fifth temperature threshold is included, the fifth temperature threshold being greater than the first temperature threshold.

[0098] When the difference is greater than or equal to the fifth temperature threshold, the first heating mode is operated; when the difference is less than the fifth temperature threshold and not less than the first temperature threshold, the second heating mode is operated.

[0099] The first heating mode is to start both the outdoor unit 2 and the heating element 12 simultaneously, while the second heating mode is to start only the outdoor unit 2, with the heating element 12 in an off or standby state. It should be noted that in this mode, the outdoor unit 2 is started and delivering heat to the room.

[0100] It should be noted that when the above difference is greater than or equal to the first temperature threshold, the heating load demand of the air conditioner is a positive value.

[0101] The heating load is affected by the outdoor temperature, indoor temperature and set temperature.

[0102] As an optional implementation, the first heating mode further includes:

[0103] Obtain the heating load of the fresh air constant temperature air conditioner, the heating output load of the outdoor unit 2, and the heating output load of the heating component 12; if the sum of the heating output loads of the outdoor unit 2 and the heating component 12 is not less than the heating load after the outdoor unit 2 runs for T1 time, the fresh air constant temperature air conditioner is controlled to enter the second heating mode.

[0104] When the outdoor ambient temperature is low, the heat pump and the heating component 12 need to be started at the same time to meet the heating load requirement. Set the heating load to Q 热负荷 , the heating output load of outdoor unit 2 is Q 热泵 , the heating output load of the heating component 12 is Q 加热 .

[0105] The above Q 热泵 The size can be adjusted according to the evaporation pressure value of outdoor unit 2.

[0106] Specifically, if the evaporation pressure value P of outdoor unit 2 蒸发 If the evaporation pressure value P of the outdoor unit 2 is between the first set evaporation value P1 and the second set evaporation value P2, the outdoor unit 2 is controlled to maintain the current heating output; 蒸发 If the evaporation pressure value P1 of the outdoor unit 2 is less than the first set evaporation pressure value P1, the outdoor unit 2 is controlled to increase the current heating output; 蒸发 If the pressure is less than the second set evaporation pressure value P2, the outdoor unit 2 is controlled to reduce the current heating output.

[0107] In this embodiment, when the heat pump system is just started, its initial heating output is Q1. When the heat pump system is running continuously for a period of time, the P 蒸发 The size of P 蒸发 > P1, then the heating output of the outdoor unit 2 is set to increase by a certain value (in this embodiment, it can be increased by 10%); if the above P 蒸发 ∈[P1, P2], then the heating output of the outdoor unit 2 is set to maintain the current output without adjustment; if the above P 蒸发 < P2, the heating output of outdoor unit 2 is reduced by a certain value (in this embodiment, 10%). The adjustment range of the above heating output can be adjusted according to actual needs. The adjustment range in this embodiment is only illustrative and does not limit the scope of protection of this solution. In addition, the above P1 and P2 values ​​can be calculated or determined based on empirical values, and their specific values ​​can be adjusted according to actual conditions.

[0108] As an optional implementation, the second heating mode further includes:

[0109] Get the heating load Q of the fresh air constant temperature air conditioner 热负荷 and the heating output load Q of outdoor unit 2 热泵 ;

[0110] If the outdoor unit 2 runs for T1 time, the outdoor unit 2 heating output load Q 热泵 Less than heating load Q 热负荷 , then the fresh air constant temperature air conditioner is controlled to enter the first heating mode.

[0111] When the outdoor ambient temperature is relatively high, simply starting the heat pump can meet the heating load requirements. The heat pump's heating load adjustment method is the same as described above and will not be repeated here. It should also be noted that in the two different heating modes, the initial heating outputs of outdoor unit 2 are Q1 and Q2, respectively. The values ​​of Q1 and Q2 can be the same or different.

[0112] It should be noted that after the outdoor unit 2 runs for T1 time, if the outdoor unit 2 heating output load Q热泵 Always less than the heating load Q 热负荷 , it means that simply starting the heat pump cannot meet the heating requirements, so it is necessary to control the fresh air constant temperature air conditioner to enter the first heating mode.

[0113] When the fresh air constant temperature air conditioner is running in the first heating mode, after a certain period of operation, if Q 热泵 +Q 加热 ≥Q 热负荷 , it means that the heat output by the fresh air constant temperature air conditioner is greater than the actual demand, so it is necessary to control the fresh air constant temperature air conditioner to enter the second heating mode and turn off the heating component 12.

[0114] In this embodiment, the above-mentioned fifth temperature threshold is set to 15, that is, when the difference between the set temperature and the outdoor temperature is greater than 15°C, the fresh air constant temperature air conditioner runs the first heating mode; when the difference between the set temperature and the outdoor temperature is not greater than 15°C and not less than the first temperature threshold, the fresh air constant temperature air conditioner runs the second heating mode.

[0115] It should be noted that the first temperature threshold is greater than 0. In this embodiment, the first temperature threshold can be set to 5.

[0116] The above method can realize the temperature control of the fresh air constant temperature air conditioner in the heating mode.

[0117] like Figure 4 As shown in the figure, when the fresh air constant temperature air conditioner operates in cooling mode:

[0118] A sixth temperature threshold is also included, and the sixth temperature threshold is lower than the fourth temperature threshold.

[0119] When the difference is less than or equal to the sixth temperature threshold, the first cooling mode is operated; when the difference is greater than the sixth temperature threshold and does not exceed the fourth temperature threshold, the second cooling mode is operated.

[0120] The first cooling mode is when only the outdoor unit 2 is activated, and the heating element 12 is in a closed or standby state; whereas the second cooling mode is when both the outdoor unit 2 and the heating element 12 are activated. It should be noted that in this case, the outdoor unit 2 is activated and delivers cooling energy to the room.

[0121] In addition, when the above difference is less than or equal to the fourth temperature threshold, the cooling load demand of the fresh air constant temperature air conditioner is a positive value.

[0122] As an optional implementation, the first cooling mode further includes:

[0123] Obtain the cooling load of the fresh air constant temperature air conditioner and the cooling output load of the outdoor unit 2; if the cooling output load of the outdoor unit 2 is greater than the cooling load after the outdoor unit 2 has been running for T1 time, control the air conditioner to enter the second cooling mode.

[0124] When the outdoor ambient temperature is relatively high, the system determines that only starting the outdoor components for cooling can achieve the effect of adjusting the inlet air temperature to the set temperature value, which can meet the cooling load requirements. Set the cooling load to Q 冷负荷 , the cooling output load of outdoor unit 2 is Q 制冷 , the heating output load of the heating component 12 is Q 加热 .

[0125] The above Q 制冷 The size can be adjusted according to the evaporation pressure value of outdoor unit 2.

[0126] Specifically, if the evaporation pressure value P of outdoor unit 2 蒸发 If the evaporation pressure value P of the outdoor unit 2 is between the first set evaporation value P1 and the second set evaporation value P2, the outdoor unit 2 is controlled to maintain the current heating output; 蒸发 If the evaporation pressure value P1 of the outdoor unit 2 is less than the first set evaporation pressure value P1, the outdoor unit 2 is controlled to increase the current heating output; 蒸发 If the pressure is less than the second set evaporation pressure value P2, the outdoor unit 2 is controlled to reduce the current heating output.

[0127] In this embodiment, when the heat pump system is just started, its cooling output is Q1. When the heat pump system is running continuously for a period of time, the P 蒸发 The size of P 蒸发 > P1, then the cooling output of the outdoor unit 2 is increased by a certain value (in this embodiment, it can be increased by 10%); if the above P 蒸发 ∈[P1, P2], then the cooling output of the outdoor unit 2 is set to maintain the current output without adjustment; if the above P 蒸发 < P2, the cooling output of outdoor unit 2 is reduced by a certain value (in this embodiment, 10%). The adjustment range of the cooling output can be adjusted according to actual needs. The adjustment range in this embodiment is for illustration only and does not limit the scope of protection of this solution. In addition, the values ​​of P1 and P2 can be calculated or determined based on empirical values, and their specific values ​​can be adjusted according to actual conditions.

[0128] It should also be noted that the initial heating output value Q1 and the initial cooling output value Q1 may be the same value or different values.

[0129] As an optional implementation, the second cooling mode further includes:

[0130] Get the cooling load Q of the fresh air constant temperature air conditioner 冷负荷 and the cooling output load Q of outdoor unit 2 制冷 and the heating output load Q of the heating component 12 加热 ; If the outdoor unit 2 runs for T1 time, the cooling output load Q 制冷 and heating output load Q 加热 The difference is less than the cooling load Q 冷负荷 , then control the fresh air constant temperature air conditioner to enter the first cooling mode.

[0131] Under cooling conditions, if the ambient temperature is high, only starting the heat pump system for cooling can meet the cooling load requirements. The cooling load adjustment method of the heat pump is consistent with the above and will not be repeated here. If the ambient temperature is relatively low (but always greater than the set temperature), only starting the heat pump system for cooling may cause the temperature of the gas discharged from the indoor air outlet to be low, which in turn causes the indoor temperature to drop. Therefore, it is necessary to start the heating component 12 simultaneously to help increase the exhaust temperature at the indoor air outlet.

[0132] In addition, in two different cooling modes, the initial cooling outputs of the outdoor unit 2 are Q1 and Q2 respectively, and the values ​​of Q1 and Q2 may be the same or different.

[0133] That is to say, if the fresh air constant temperature air conditioner running in the first cooling mode runs for a certain period of time, 冷负荷 <Q 制冷 At this time, it is necessary to control the heating component 12 to be in the starting state, that is, to control the fresh air constant temperature air conditioner to enter the second cooling mode and turn on the heating component 12; and after the fresh air constant temperature air conditioner running in the second cooling mode has run for a certain period of time, if Q 冷负荷 >Q 制冷 -Q 加热 , then it is necessary to control the heating component 12 to be in the off state, that is, to control the fresh air constant temperature air conditioner to enter the first cooling mode.

[0134] In this embodiment, the above-mentioned sixth temperature threshold is set to -10, that is, when the difference between the set temperature and the outdoor temperature is not greater than -10℃, the fresh air constant temperature air conditioner operates in the first cooling mode; when the difference between the set temperature and the outdoor temperature is greater than -10℃ and less than or equal to the fourth temperature threshold, the fresh air constant temperature air conditioner operates in the second cooling mode.

[0135] It should be noted that the fourth temperature threshold is less than 0. In this embodiment, the fourth temperature threshold can be set to -5.

[0136] The above method can realize the temperature control of the fresh air constant temperature air conditioner in the cooling mode.

[0137] like Figure 5 As shown, when the fresh air constant temperature air conditioner operates in transition mode, the above-mentioned heating component 12 is in a closed or stopped state, and the outdoor unit 2 is in different operating states: at least one outdoor unit 2 delivers heat to the room, and at least one outdoor unit 2 delivers cold air to the room.

[0138] The second temperature threshold is greater than zero and less than the first temperature threshold, and the third temperature threshold is less than zero and greater than the fourth temperature threshold. In this embodiment, the second temperature threshold can be set to 3 and the third temperature threshold can be set to -3.

[0139] At this time, the outdoor ambient temperature is relatively close to the set temperature. In order to avoid large temperature fluctuations caused by frequent switching between heating and cooling modes of the fresh air constant temperature air conditioner, and to better protect the stability of the fresh air constant temperature air conditioner, the outdoor unit 2 is set to input cooling and heating to the room respectively.

[0140] This embodiment is described by taking the number of two outdoor units 2 as an example. In this embodiment, one outdoor unit 2 delivers heat to the room, and the other outdoor unit 2 delivers cold air to the room.

[0141] Obtain the load demand of the fresh air constant temperature air conditioner and the heating output load and cooling output load of outdoor unit 2; if the difference between the cooling output load and the heating output load is greater than the load demand, increase the heating output load or reduce the cooling output load; if the difference between the cooling output load and the heating output load is less than the load demand, increase the cooling output load or reduce the heating output load.

[0142] Specifically, the load demand of the fresh air constant temperature air conditioner can be determined based on the outdoor temperature, indoor temperature, and set temperature. When the fresh air constant temperature air conditioner is in operation, when the load demand of the air conditioner is equal to the difference between the cooling output load and the heating output load of the outdoor unit, the indoor temperature can be maintained at the set temperature.

[0143] When the cooling output load is greater than the heating output load, the working state of the fresh air constant temperature air conditioner can be adjusted by increasing the heating output load or reducing the cooling output load:

[0144] The cooling and / or heating load adjustment method of the heat pump at this time is set to be consistent with the above. If the evaporation pressure value of the outdoor unit 2 of the cooling output load is in a normal state (that is, the cooling output load remains unchanged at this time), the heating output load is increased; otherwise, the cooling load output is reduced.

[0145] When the cooling output load is less than the heating output load, the working state of the fresh air constant temperature air conditioner can be adjusted by reducing the heating output load or increasing the cooling output load:

[0146] If the evaporation pressure value of the outdoor unit 2 with heating output load is in a normal state (ie, the heating output load remains unchanged at this time), the cooling output load is increased; otherwise, the heating load output is reduced.

[0147] If the load demand of the above-mentioned fresh air constant temperature air conditioner is not less than -0.5KW and does not exceed 0.5KW, the load demand of the fresh air constant temperature air conditioner can be maintained unchanged, that is, the current heating output load and cooling output load are maintained unchanged.

[0148] It should also be noted that when the difference falls between the first temperature threshold and the second temperature threshold, or when the difference falls between the third temperature threshold and the fourth temperature threshold, the fresh air constant temperature air conditioner can be controlled to operate in a transition mode.

[0149] Example 3:

[0150] This embodiment further provides a fresh air constant temperature air conditioning control device 100, comprising:

[0151] The acquisition module 101 is used to obtain the difference between the outdoor temperature and the set temperature;

[0152] The control module 102 is used to adjust the operation mode of the fresh air constant temperature air conditioner according to the difference obtained by the acquisition module 101.

[0153] Example 4:

[0154] This embodiment also provides a fresh air constant temperature air conditioner, comprising:

[0155] One or more memories storing executable programs;

[0156] One or more processors are used to execute the executable program in the memory to implement the steps of any of the above methods.

[0157] The memory may include, but is not limited to, the various modules in the processing device. In addition, it may also include, but is not limited to, other module units in the processing device, which will not be described in detail in this example.

[0158] It can be understood that the technical solution provided in this embodiment can control the operation mode of the fresh air constant temperature air conditioner by obtaining relevant data and comparing differences, thereby ensuring that the indoor temperature can be maintained constant.

[0159] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0160] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0161] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by appropriate instructions. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having logic gate circuits for implementing logic functions on data signals, an application-specific integrated circuit having appropriate combinational logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0162] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0163] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0164] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0165] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0166] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for controlling a fresh air constant temperature air conditioner, characterized in that: The fresh air constant temperature air conditioner includes a fresh air handler and an outdoor unit, the fresh air handler includes a fresh air heat exchanger and a heating assembly, the number of the outdoor units is at least two and all the outdoor units can be connected to the fresh air handler via the fresh air heat exchanger; The control method includes: Get the difference between the set temperature and the outdoor temperature; adjusting the operating mode of the fresh air constant temperature air conditioner according to the difference; Adjusting the operation mode of the fresh air constant temperature air conditioner according to the difference includes: When the difference is greater than or equal to a first temperature threshold, controlling the fresh air constant temperature air conditioner to operate in a heating mode; When the difference is between the second temperature threshold and the third temperature threshold, controlling the fresh air constant temperature air conditioner to operate in a transition mode; When the difference is less than or equal to a fourth temperature threshold, controlling the fresh air constant temperature air conditioner to operate in a cooling mode; The transition mode includes starting only the outdoor units, at least one of the outdoor units delivering heat to the room, and at least one of the outdoor units delivering cooling to the room.

2. The fresh air constant temperature air conditioning control method according to claim 1, characterized in that: The heating mode includes: When the difference is greater than or equal to a fifth temperature threshold, operating the first heating mode; When the difference is less than a fifth temperature threshold, operating the second heating mode; The fifth temperature threshold is greater than the first temperature threshold.

3. The fresh air constant temperature air conditioning control method according to claim 2, characterized in that: The first heating mode includes simultaneously starting the outdoor unit and the heating assembly; The second heating mode includes starting only the outdoor unit; The outdoor unit delivers heat to the room when started.

4. The fresh air constant temperature air conditioning control method according to claim 3, characterized in that: The first heating mode further includes: Obtaining the heating load of the fresh air constant temperature air conditioner, the heating output load of the outdoor unit, and the heating output load of the heating component; If the sum of the heating output loads of the outdoor unit and the heating component is not less than the heating load after the outdoor unit has been running for T1 time, the fresh air constant temperature air conditioner is controlled to enter the second heating mode.

5. The fresh air constant temperature air conditioning control method according to claim 3, characterized in that: The second heating mode further includes: Obtaining the heating load of the fresh air constant temperature air conditioner and the heating output load of the outdoor unit; If the heating output load of the outdoor unit is less than the heating load after the outdoor unit has been running for T1 time, the fresh air constant temperature air conditioner is controlled to enter the first heating mode.

6. The fresh air constant temperature air conditioning control method according to claim 3, characterized in that: Obtaining the evaporation pressure value of the outdoor unit after running for T2 time; If the evaporation pressure value of the outdoor unit is between the first set evaporation pressure value and the second set evaporation pressure value, controlling the outdoor unit to maintain the current heating output; If the evaporation pressure value of the outdoor unit is less than the first set evaporation pressure value, controlling the outdoor unit to increase the current heating output; If the evaporation pressure value of the outdoor unit is less than the second set evaporation pressure value, the outdoor unit is controlled to reduce the current heating output.

7. The fresh air constant temperature air conditioning control method according to claim 1, characterized in that: The cooling mode includes: When the difference is less than or equal to a sixth temperature threshold, operating the first cooling mode; When the difference is greater than a sixth temperature threshold, running the second cooling mode; The sixth temperature threshold is lower than the fourth temperature threshold.

8. The fresh air constant temperature air conditioning control method according to claim 7, characterized in that: The first cooling mode, Including, starting only the outdoor unit; The second cooling mode, The method includes simultaneously starting the outdoor unit and the heating component; The outdoor unit delivers cold air to the indoor room when it is started.

9. The fresh air constant temperature air conditioning control method according to claim 8, characterized in that: The first cooling mode further includes: Obtaining the cooling load of the fresh air constant temperature air conditioner and the cooling output load of the outdoor unit; If the cooling output load of the outdoor unit is greater than the cooling load after the outdoor unit has been running for T1 time, the fresh air constant temperature air conditioner is controlled to enter the second cooling mode.

10. The fresh air constant temperature air conditioning control method according to claim 8, characterized in that: The second cooling mode further includes: Obtaining the cooling load of the fresh air constant temperature air conditioner, the cooling output load of the outdoor unit, and the heating output load of the heating component; If the difference between the cooling output load and the heating output load is less than the cooling load after the outdoor unit has been running for T1 time, the fresh air constant temperature air conditioner is controlled to enter the first cooling mode.

11. The fresh air constant temperature air conditioning control method according to claim 8, characterized in that: Obtaining the evaporation pressure value of the outdoor unit after running for T2 time; If the evaporation pressure value of the outdoor unit is between the first set evaporation pressure value and the second set evaporation pressure value, controlling the outdoor unit to maintain the current cooling output; If the evaporation pressure value of the outdoor unit is less than the first set evaporation pressure value, controlling the outdoor unit to increase the current cooling output; If the evaporation pressure value of the outdoor unit is less than the second set evaporation pressure value, the outdoor unit is controlled to reduce the current cooling output.

12. The fresh air constant temperature air conditioning control method according to claim 11, characterized in that: Obtaining the load demand of the fresh air constant temperature air conditioner and the heating output load and cooling output load of the outdoor unit; If the difference between the cooling output load and the heating output load is greater than the load requirement, increasing the heating output load or decreasing the cooling output load; If the difference between the cooling output load and the heating output load is less than the load requirement, the cooling output load is increased or the heating output load is decreased.

13. A fresh air constant temperature air conditioning control device, used to execute the fresh air constant temperature air conditioning control method according to any one of claims 1 to 12, characterized in that: include: An acquisition module, configured to acquire a difference between a set temperature and an outdoor temperature; A control module is used to adjust the operation mode of the fresh air constant temperature air conditioner according to the difference obtained by the acquisition module.

14. A fresh air constant temperature air conditioner, characterized in that: include: One or more memories storing executable programs; One or more processors, configured to execute the executable program in the memory to implement the steps of the method according to any one of claims 1 to 12.

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