An air conditioning system

Abstract

The present invention discloses an air-conditioning system. The system judges whether a startup condition is met by the difference between an indoor return air temperature Ta and an indoor set temperature Td. When the startup condition is met, a heat pump unit and a fan coil unit are started and operated. Then, the system judges whether a shutdown condition is met by the difference between a return water temperature Ts of the heat pump unit and an indoor set temperature Td. When the shutdown condition is met, the heat pump unit is shut down and the fan coil unit keeps running. The system controls the start and stop of the heat pump unit by the indoor return air temperature Ta, the indoor set temperature Td and the return water temperature Ts of the heat pump unit, thereby realizing precise control of the indoor temperature, improving the control accuracy of the indoor temperature, preventing the heat pump unit and the fan coil unit from being frequently started and stopped, extending the service life of the heat pump unit and the fan coil unit, meeting the indoor temperature requirements of users and improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning system. Background Art

[0002] With the improvement of living standards, indoor air conditioning equipment has been widely used in family life.

[0003] The Sanheng system is a device that can uniformly control the indoor CO2 concentration, temperature, and humidity. It can automatically and uniformly adjust the indoor CO2 concentration, temperature, and humidity to achieve automatic control.

[0004] The current three-constant system has relatively inaccurate control methods for indoor CO2 concentration, temperature and humidity, resulting in a poor temperature and humidity experience for users. In addition, the frequent start and stop control of system equipment will seriously affect the service life cycle of the unit and cause energy waste. Summary of the invention

[0005] The invention provides an air conditioning system, which solves the problem of low temperature control accuracy.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] The present invention provides an air conditioning system, comprising:

[0008] Heat pump units;

[0009] A fan coil unit, which is connected to the heat pump unit through a water pipeline;

[0010] A controller configured to:

[0011] Get the indoor return air temperature Ta and indoor set temperature Td;

[0012] When the difference between the indoor return air temperature Ta and the indoor set temperature Td meets the startup conditions, the heat pump unit and the fan coil unit start running; the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td is calculated; when the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the shutdown conditions, the heat pump unit stops and the fan coil unit keeps running.

[0013] In some embodiments of the present application, when the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td meets the shutdown condition, the heat pump unit is shut down and the fan coil unit keeps running, specifically including:

[0014] When the difference between the indoor return air temperature Ta and the indoor set temperature Td meets the first startup temperature range, the heat pump unit is running, and the fan coil unit is running at the first preset wind speed; judging whether the absolute value of the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the first shutdown temperature range, when the absolute value of the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the first shutdown temperature range, the heat pump unit is shut down, and the fan coil unit maintains the first preset wind speed;

[0015] When the difference between the indoor return air temperature Ta and the indoor set temperature Td meets the second startup temperature range, the heat pump unit is running, and the fan coil unit is running at the second preset wind speed; it is judged whether the absolute value of the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the second shutdown temperature range. When the absolute value of the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the second shutdown temperature range, the heat pump unit is shut down, and the fan coil unit maintains the second preset wind speed;

[0016] The value within the first startup temperature range is greater than the value within the second startup temperature range;

[0017] The upper limit value of the first shutdown temperature range is greater than the upper limit value of the second shutdown temperature range;

[0018] The first preset wind speed is less than the second preset wind speed.

[0019] In some embodiments of the present application, the controller is further configured to:

[0020] When the difference between the indoor return air temperature Ta and the indoor set temperature Td does not meet the startup conditions, the heat pump unit shuts down. If the fan coil unit is in operation at this time, the fan coil unit shuts down after running for the set time.

[0021] In some embodiments of the present application, the air conditioning system further includes:

[0022] A fresh air fan, which is used to provide fresh air to the room;

[0023] The controller is also configured to:

[0024] Obtain actual indoor air quality data;

[0025] Control the start and stop of the fresh air fan according to the actual indoor air quality data.

[0026] In some embodiments of the present application, the control of starting and stopping the fresh air fan according to the actual indoor air quality data specifically includes:

[0027] Determine whether the actual indoor air quality data is within the set concentration range;

[0028] When the actual indoor air quality data is within the set concentration range, the deviation value rα between the actual indoor air quality data and the target air quality data is calculated;

[0029] Calculate the deviation rate rα'=the deviation value rα calculated this time-the deviation value calculated last time;

[0030] The speed of the fresh air fan is controlled according to the deviation value rα and deviation rate rα' calculated this time.

[0031] In some embodiments of the present application, the control of the rotation speed of the fresh air fan according to the deviation value rα and the deviation rate rα' calculated this time specifically includes:

[0032] When rα reaches the set deviation value and rα' reaches the set deviation rate, the fresh air fan runs at the first set speed;

[0033] When rα reaches the set deviation value and rα' does not reach the set deviation rate, the fresh air fan runs at the second set speed;

[0034] When rα does not reach the set deviation value, and rα' reaches the set deviation rate, the fresh air fan runs at the third set speed;

[0035] When rα does not reach the set deviation value, and rα' does not reach the set deviation rate, the fresh air fan runs at the fourth set speed;

[0036] Among them, the first set speed>the second set speed>the third set speed>the fourth set speed.

[0037] In some embodiments of the present application, the controller is further configured to:

[0038] When the actual indoor air quality data exceeds the upper limit of the set concentration range, the fresh air fan runs at the first set speed;

[0039] When the actual indoor air quality data does not exceed the lower limit of the set concentration range, the fresh air fan will shut down.

[0040] In some embodiments of the present application, the air conditioning system further includes:

[0041] Humidifiers and dehumidifiers to regulate indoor humidity;

[0042] The controller is further configured to control the humidification amount / dehumidification amount and humidification time / dehumidification time of the humidifier / dehumidifier according to the actual indoor humidity.

[0043] In some embodiments of the present application, the water storage part of the humidifier is connected to the heat pump unit through a water pipeline; the coil of the dehumidifier is also connected to the heat pump unit through a water pipeline.

[0044] In some embodiments of the present application, the controller is further configured to:

[0045] First, the operation of the fresh air fan is controlled according to the actual indoor air quality data;

[0046] When the fresh air fan stops, the operation of the heat pump unit and fan coil unit is controlled according to the indoor return air temperature and indoor set temperature;

[0047] When the fan coil unit is shut down, the humidification / dehumidification amount and humidification time / dehumidification time of the humidifier / dehumidifier are controlled according to the actual indoor humidity.

[0048] The technical solution of the present invention has the following technical effects relative to the prior art: the air-conditioning system of the present invention determines whether the startup conditions are met by the difference between the indoor return air temperature Ta and the indoor set temperature Td, and the heat pump unit and the fan coil unit are started and operated when the startup conditions are met; and then determines whether the shutdown conditions are met by the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td, and the heat pump unit is shut down and the fan coil unit keeps running when the shutdown conditions are met; the start and stop of the heat pump unit are controlled by the indoor return air temperature Ta, the indoor set temperature Td, and the heat pump unit return water temperature Ts, so as to achieve precise control of the indoor temperature, improve the control accuracy of the indoor temperature, prevent the heat pump unit and the fan coil unit from being frequently started and stopped, extend the service life of the heat pump unit and the fan coil unit, meet the user's indoor temperature requirements, and improve the user's usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0050] Figure 1 A schematic structural diagram of an embodiment of an air conditioning system of the present invention;

[0051] Figure 2 An electrical control block diagram of an embodiment of the air conditioning system of the present invention;

[0052] Figure 3 A flow chart of an embodiment of a control method executed by a controller of an air conditioning system of the present invention;

[0053] Figure 4 A flow chart of another embodiment of a control method executed by a controller of an air conditioning system of the present invention;

[0054] Figure 5 A flow chart of another embodiment of a control method executed by a controller of an air conditioning system of the present invention;

[0055] Figure 6 A flow chart of another embodiment of a control method executed by a controller of an air conditioning system of the present invention;

[0056] Figure 7 A flow chart of another embodiment of a control method executed by a controller of an air conditioning system of the present invention;

[0057] Figure 8 A flow chart of another embodiment of a control method executed by a controller of an air conditioning system of the present invention;

[0058] Fig. 9 A flow chart of another embodiment of a control method executed by a controller of an air conditioning system of the present invention;

[0059] Fig.10 A flow chart of another embodiment of a control method executed by a controller of an air conditioning system of the present invention;

[0060] Fig.11 The present invention is a flowchart of another embodiment of a control method executed by a controller of an air-conditioning system.

[0061] Reference numerals:

[0062] 1. Heat pump unit; 2. Fresh air dehumidifier and humidifier; 3. Fan coil unit; 4. Fan coil unit;

[0063] 5. Water tank; 6. Water pump. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0065] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0066] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0067] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] The heat pump unit performs the cooling and heating cycle of the heat pump unit by using a compressor, condenser, expansion valve and evaporator. The cooling and heating cycle includes a series of processes involving compression, condensation, expansion and evaporation to cool or heat the indoor space.

[0069] The low-temperature and low-pressure refrigerant enters the compressor, which compresses it into high-temperature and high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0070] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0071] The outdoor unit of the heat pump unit refers to the part of the refrigeration cycle including the compressor, outdoor heat exchanger and outdoor fan, the indoor unit of the air conditioner includes the indoor heat exchanger and indoor fan, and a throttling device (such as a capillary tube or an electronic expansion valve) can be provided in the indoor unit or the outdoor unit.

[0072] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner performs a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner performs a cooling mode.

[0073] Among them, the indoor heat exchanger and the outdoor heat exchanger are converted to serve as a condenser or an evaporator, generally using a four-way valve. Please refer to the settings of conventional air conditioners for details, which will not be elaborated here.

[0074] The refrigeration working principle of the heat pump unit is: the operation of the compressor makes the indoor heat exchanger (in the indoor unit, it is the evaporator at this time) in an ultra-low pressure state, the liquid refrigerant in the indoor heat exchanger evaporates rapidly to absorb heat, and the wind blown out by the indoor fan is cooled by the indoor heat exchanger coil and becomes cold air blown into the room. The evaporated refrigerant is pressurized by the compressor and condensed into liquid under the high-pressure environment of the outdoor heat exchanger (in the outdoor unit, it is the condenser at this time), releasing heat, and dissipating the heat into the atmosphere through the outdoor fan. This cycle achieves the refrigeration effect.

[0075] The heating working principle of the heat pump unit is as follows: the gaseous refrigerant is pressurized by the compressor, becomes a high-temperature and high-pressure gas, enters the indoor heat exchanger (the condenser at this time), condenses and liquefies to release heat, becomes a liquid, and heats the indoor air at the same time, thereby achieving the purpose of increasing the indoor temperature. The liquid refrigerant is decompressed by the throttling device and enters the outdoor heat exchanger (the evaporator at this time), evaporates and absorbs heat, becomes a gas, and absorbs heat from the outdoor air (the outdoor air becomes colder), becomes a gaseous refrigerant, and enters the compressor again to start the next cycle.

[0076] The air conditioning system of this embodiment includes a heat pump unit 1, a fan coil unit, a controller, etc.

[0077] The heat pump unit is a variable frequency air source heat pump unit. When cooling or heating, the heat pump unit can output cold water and hot water for use at the end of water consumption. The end of water consumption can be fan coil units, floor heating and other equipment.

[0078] The air conditioning system includes a plurality of fan coil units. For example, the air conditioning system includes fan coil unit 3 and fan coil unit 4, and the two fan coil units are connected in parallel.

[0079] The heat pump unit 1 has a water inlet pipe, a water outlet pipe, a water pump 6 and a water tank 5, see Figure 1 As shown. The water pump 6 is arranged on the water inlet pipe or the water outlet pipe of the heat pump unit 1 to provide power for water circulation. The fan coil unit is connected to the heat pump unit 1 through a water pipeline.

[0080] Controller, which controls the operation of heat pump unit, fan coil unit, water pump, etc., see Figure 2 shown.

[0081] The air conditioning system of this embodiment has a controller configured to: obtain the indoor return air temperature Ta and the indoor set temperature Td; when the difference between the indoor return air temperature Ta and the indoor set temperature Td meets the startup condition, the heat pump unit and the fan coil unit operate; calculate the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td; when the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td meets the shutdown condition, the heat pump unit shuts down and the fan coil unit keeps running.

[0082] The controller specifically performs the following steps, see Figure 3 shown.

[0083] Step S11: Obtain the indoor return air temperature Ta and the indoor set temperature Td.

[0084] Step S12: Calculate the difference between the indoor return air temperature Ta and the indoor set temperature Td.

[0085] Step S13: Determine whether the difference between the indoor return air temperature Ta and the indoor set temperature Td meets the startup condition.

[0086] When the difference between the indoor return air temperature Ta and the indoor set temperature Td meets the startup condition, step S14 is executed.

[0087] Step S14: The heat pump unit and the fan coil unit are running.

[0088] Step S15: Calculate the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td.

[0089] Step S16: Determine whether the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td satisfies the shutdown condition.

[0090] When the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td meets the shutdown condition, step S17 is executed: the heat pump unit is shut down, and the fan coil unit keeps running.

[0091] The air-conditioning system of this embodiment first determines whether the startup condition is met by the difference between the indoor return air temperature Ta and the indoor set temperature Td. When the startup condition is met, the heat pump unit and the fan coil unit are started and operated; then, it is determined whether the shutdown condition is met by the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td. When the shutdown condition is met, the heat pump unit is shut down and the fan coil unit keeps running; the start and stop of the heat pump unit are controlled by the indoor return air temperature Ta, the indoor set temperature Td, and the heat pump unit return water temperature Ts, so as to achieve precise control of the indoor temperature, improve the control accuracy of the indoor temperature, prevent the heat pump unit and the fan coil unit from being frequently started and stopped, extend the service life of the heat pump unit and the fan coil unit, meet the user's indoor temperature requirements, and improve the user's usage experience.

[0092] In some embodiments of the present application, step S17, when the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td meets the shutdown condition, the heat pump unit is shut down and the fan coil unit keeps running, specifically includes:

[0093] (17-1) When the difference between the indoor return air temperature Ta and the indoor set temperature Td satisfies the first startup temperature range, that is, the difference between Ta and Td is within the first startup temperature range, indicating that the indoor return air temperature Ta has not reached the indoor set temperature Td, and the difference between the two is not large, then execute the following steps, see Figure 4 shown.

[0094] Step S17-11: The heat pump unit is running, and the fan coil unit is running at a first preset wind speed.

[0095] Step S17-12: Calculate the absolute value of the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td.

[0096] Step S17-13: Determine whether the absolute value of the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td satisfies the first shutdown temperature range, that is, determine whether the absolute value of the difference between Ts and Td is within the first shutdown temperature range.

[0097] When the absolute value of the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td meets the first shutdown temperature range, it means that the return water temperature Ts is not much different from the indoor set temperature Td, then execute step S17-14: the heat pump unit is shut down to save energy, and the fan coil unit maintains the first preset wind speed to ensure the indoor temperature requirement.

[0098] (17-2) When the difference between the indoor return air temperature Ta and the indoor set temperature Td satisfies the second startup temperature range, that is, the difference between Ta and Td is within the second startup temperature range, indicating that the indoor return air temperature Ta has not reached the indoor set temperature Td, and the difference between the two is large, then execute the following steps, see Figure 5 shown.

[0099] Step S17-21: The heat pump unit is running, and the fan coil unit is running at a second preset wind speed.

[0100] Step S17-22: Calculate the absolute value of the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td.

[0101] Step S17-23: Determine whether the absolute value of the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td satisfies the second shutdown temperature range, that is, determine whether the absolute value of the difference between Ts and Td is within the second shutdown temperature range.

[0102] When the absolute value of the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td meets the second shutdown temperature range, it means that the return water temperature Ts is not much different from the indoor set temperature Td, then execute step S17-24: the heat pump unit is shut down to save energy, and the fan coil unit maintains the second preset wind speed to ensure the indoor temperature requirement.

[0103] The value within the first startup temperature range is greater than the value within the second startup temperature range;

[0104] The upper limit value of the first shutdown temperature range is greater than the upper limit value of the second shutdown temperature range;

[0105] The first preset wind speed is less than the second preset wind speed.

[0106] The startup conditions include a first startup temperature range and a second startup temperature range; the shutdown conditions include a first shutdown temperature range and a second shutdown temperature range. Different startup conditions correspond to different shutdown conditions. The first startup temperature range corresponds to the first shutdown temperature range, and the second startup temperature range corresponds to the second shutdown temperature range.

[0107] By subdividing the startup conditions and shutdown conditions, different startup conditions correspond to different shutdown conditions, so as to achieve precise control of indoor temperature. This not only meets the user's demand for indoor temperature, but also saves energy and prevents frequent start and stop of heat pump units and fan coil units.

[0108] In some embodiments of the present application, the controller is further configured to perform the following steps: Figure 6 shown.

[0109] When the difference between the indoor return air temperature Ta and the indoor set temperature Td does not meet the startup conditions, the heat pump unit shuts down to avoid wasting energy; if the fan coil unit is in operation at this time, the fan coil unit will shut down after running for a set period of time to ensure the indoor temperature requirements; if the fan coil unit is in a shutdown state at this time, it will remain in the shutdown state.

[0110] When the difference between the indoor return air temperature Ta and the indoor set temperature Td does not meet the startup conditions, the delayed shutdown duration of the fan coil is determined according to the difference between the indoor return air temperature Ta and the indoor set temperature Td, which not only saves energy but also meets the user's demand for indoor temperature and prevents the heat pump unit and fan coil from frequent start and stop.

[0111] The operation of the heat pump unit and the fan coil unit is described in detail below through a specific embodiment.

[0112] The startup conditions are: Ta-Td<0;

[0113] The first startup temperature range is: -2℃<Ta-Td<0;

[0114] The second startup temperature range is: Ta-Td≤-2℃;

[0115] The shutdown condition is: |Ts-Td|≤3℃;

[0116] The first shutdown temperature range is: |Ts-Td|≤3℃;

[0117] The second shutdown temperature range is: |Ts-Td|≤1℃.

[0118] Detect indoor return air temperature Ta, heat pump unit return water temperature Ts, and indoor set temperature Td;

[0119] When 2℃<Ta-Td, the startup conditions are not met, the heat pump unit is shut down, and the fan coil unit is shut down after running at a low speed for the first set time. After t1 time, it is re-judged whether the startup conditions are met, and the heat pump unit and fan coil unit are turned on and off according to Ta.

[0120] When 0<Ta-Td≤2℃, the startup conditions are not met, the heat pump unit is shut down, and the fan coil unit is shut down after running at a low speed for the second set time; the second set time is less than the first set time. After t2 time, it is re-judged whether the startup conditions are met, and the heat pump unit and fan coil unit are turned on and off according to Ta.

[0121] When -2℃<Ta-Td<, the startup condition is met, the heat pump unit is running, and the fan coil unit continues to run at medium speed (the first preset wind speed). When the relationship between the return water temperature Ts of the heat pump unit and the indoor set temperature Td reaches |Ts-Td|≤3℃, the shutdown condition is met, the heat pump unit is shut down, and the fan coil unit continues to run at medium speed. After t3 time, re-judge whether the startup condition is met, and control the start and stop of the heat pump unit and fan coil unit according to Ta.

[0122] When Ta-Td≤-2℃, the startup conditions are met, the heat pump unit continues to run under load, and the fan coil unit continues to run at high speed (the second preset wind speed). When the relationship between the return water temperature Ts of the host and the indoor set temperature Td reaches |Ts-Td|≤1℃, the shutdown conditions are met, the heat pump unit stops, and the fan coil unit continues to run at high speed. After t4 time, re-judge whether the startup conditions are met, and control the start and stop of the heat pump unit and fan coil unit according to Ta.

[0123] The air conditioning system of the present application continuously detects the indoor return air temperature Ta, determines the relationship with the indoor set temperature Td, and performs on-off linkage control of the fan coil and heat pump unit to achieve constant temperature control of the indoor temperature.

[0124] In some embodiments of the present application, in order to improve the indoor air quality, the air conditioning system also includes a fresh air fan for providing fresh air to the room.

[0125] The controller is also configured to perform the following steps, see Figure 7 shown.

[0126] Step S21: Acquire actual indoor air quality data.

[0127] Step S22: Control the start and stop of the fresh air fan according to the actual indoor air quality data.

[0128] By setting up a fresh air fan and controlling its start and stop according to the actual indoor air quality data, the indoor air quality can be improved and energy can be saved.

[0129] Air quality data includes CO2 concentration value, PM2.5 concentration value, VOC value, etc.

[0130] The fresh air fan of this embodiment can be connected to the outdoor space to introduce outdoor fresh air into the room to improve the indoor air quality; it can also introduce the indoor return air into the full heat exchanger in the fresh air fan, filter and disinfect the indoor return air, and then send it back to the room to improve the indoor air quality.

[0131] In some embodiments of the present application, step S22, controlling the start and stop of the fresh air fan according to the actual indoor air quality data, specifically includes the following steps, see Figure 8 shown.

[0132] Step S21: Acquire actual indoor air quality data.

[0133] Step S22-1: Determine whether the actual indoor air quality data is within the set concentration range.

[0134] When the actual indoor air quality data is within the set concentration range, step S22-2 is executed.

[0135] Step S22-2: Calculate the deviation value rα between the actual indoor air quality data α and the target air quality data α1. rα=α-α1.

[0136] Step S22 - 3 : Calculate the deviation rate rα′=the deviation value rα calculated this time−the deviation value calculated last time.

[0137] The air quality data is tested once in each detection cycle.

[0138] Deviation rate rα'=deviation value rα calculated in this detection cycle - deviation value calculated in the previous detection cycle.

[0139] Step S22 - 4 : Control the rotation speed of the fresh air fan according to the deviation value rα and the deviation rate rα′ calculated this time.

[0140] The deviation value rα indicates the gap between the actual indoor air quality data and the target air quality data. The deviation rate rα' indicates the changing trend of the actual indoor air conditioning quality data. The deviation value rα and the deviation rate rα' can characterize the indoor air quality at this time. By controlling the speed of the fresh air fan according to the deviation value rα and the deviation rate rα', the speed of the fresh air fan can be accurately controlled, the amount of fresh air introduced can be controlled, the indoor air quality can be improved, constant oxygen control can be achieved, the control accuracy of the indoor air quality can be improved, and the frequent start and stop of the fresh air fan can be prevented.

[0141] In some embodiments of the present application, step S22-4, controlling the rotation speed of the fresh air fan according to the deviation value rα and the deviation rate rα' calculated this time, specifically includes the following steps:

[0142] (1) When rα reaches the set deviation value and rα' reaches the set deviation rate, it means that the indoor air quality data is large and the change trend is increasing. In this case, the fresh air fan is controlled to run at the first set speed to improve the indoor air quality as quickly as possible.

[0143] (2) When rα reaches the set deviation value and rα' does not reach the set deviation rate, it means that the indoor air quality data is large, but the trend of change is decreasing. In this case, the fresh air fan is controlled to run at the second set speed.

[0144] (3) When rα does not reach the set deviation value and rα' reaches the set deviation rate, it means that the indoor air quality data is small, but the trend of change is increasing. In this case, the fresh air fan is controlled to run at the third set speed.

[0145] (4) When rα does not reach the set deviation value and rα' does not reach the set deviation rate, it means that the indoor air quality data is small, but the trend of change is getting smaller, then the fresh air fan is controlled to run at the fourth set speed.

[0146] Among them, the first set speed>the second set speed>the third set speed>the fourth set speed.

[0147] In some embodiments of the present application, the deviation value is set to 0.

[0148] The speed of the fresh air fan is controlled according to the deviation value rα and the deviation rate rα', which not only improves the indoor air quality but also avoids wasting energy.

[0149] In some embodiments of the present application, when the actual indoor air quality data is not within the set concentration range, the controller is further configured to perform the following steps: Fig. 9 shown.

[0150] When the actual indoor air quality data exceeds the upper limit of the set concentration range, it means that the indoor air quality is very poor. The fresh air fan runs at the first set speed to quickly improve the indoor air quality.

[0151] When the actual indoor air quality data does not exceed the lower limit of the set concentration range, it means that the indoor air quality is very good and the fresh air fan is shut down to save energy.

[0152] The target air quality data is the lower limit of the set concentration range.

[0153] Below, through a specific embodiment, taking the indoor CO2 concentration as an example, the operation of the fresh air fan is described in detail.

[0154] The set concentration range is (350PPM, 450PPM]; the target air quality data is 350PPM.

[0155] (1) Detect the actual indoor CO2 concentration value α.

[0156] (2) When α>450PPM, it exceeds the upper limit of the set concentration range, indicating that the indoor CO2 content is very high. The fresh air mode of the fresh air fan is automatically turned on, and the fresh air fan continues to run at high speed H (the first set speed).

[0157] (3) When α≤350PPM, it does not exceed the lower limit of the set concentration range, indicating that the indoor CO2 content is very low. Turn off the fresh air mode and shut down the fresh air fan.

[0158] (4) When 350PPM<α≤450PPM, the fresh air fan operates in fresh air mode, and the fan speed operates according to the following control logic:

[0159] The deviation rα between the actual CO2 concentration and the target CO2 concentration, as well as the deviation rate rα', are calculated every 60 seconds.

[0160] When rα>50 and the deviation rate rα'>0, the fresh air fan continues to operate in high-speed H mode (the first set speed);

[0161] When rα>50 and the deviation rate rα'≤0, the fresh air fan continues to operate in the medium speed M1 mode (the second set speed);

[0162] When rα≤50 and the deviation rate rα'>0, the fresh air fan continues to operate in the medium speed M2 mode (the third set speed);

[0163] When rα≤50 and the deviation rate rα'≤0, the fresh air fan continues to operate in the low-speed L mode (the fourth set speed).

[0164] According to the CO2 concentration deviation value rα, the fresh air fan is turned on in stages to avoid indoor heat loss and rapid drop in room temperature.

[0165] In some embodiments of the present application, in order to ensure that the indoor humidity reaches an appropriate level, the air conditioning system also includes a humidifier and a dehumidifier for adjusting the indoor humidity.

[0166] The controller is further configured to control the humidification amount / dehumidification amount and humidification time / dehumidification time of the humidifier / dehumidifier according to the actual indoor humidity.

[0167] The controller specifically performs the following steps, see Fig.10 shown.

[0168] Step S31: Detect the actual indoor humidity.

[0169] Step S32: Determine whether the actual indoor humidity is within the set humidity range.

[0170] If the actual indoor humidity is within the set humidity range, it means that the indoor humidity is appropriate and there is no need to turn on the humidifier and dehumidifier, then step S33 is executed: the humidifier and dehumidifier are turned off.

[0171] If the actual indoor humidity is not within the set humidity range, execute step S34:

[0172] If the actual indoor humidity exceeds the upper limit of the set humidity range, it means that the indoor humidity is high, and the dehumidifier is turned on to run at the set dehumidification capacity and set dehumidification time. The higher the actual indoor humidity, the longer the dehumidification capacity and dehumidification time of the dehumidifier.

[0173] If the actual indoor humidity is lower than the lower limit of the set humidity range, it means that the indoor humidity is low, then the humidifier is turned on to run at the set humidification amount and set humidification time. And the lower the actual indoor humidity, the longer the humidification amount and humidification time of the humidifier.

[0174] According to the actual indoor humidity, the humidification amount and humidification time of the humidifier, as well as the dehumidification amount and dehumidification time of the dehumidifier are controlled, which can not only achieve precise control of the indoor humidity, improve the control accuracy of the indoor humidity, prevent the humidifier and dehumidifier from starting and stopping frequently, achieve constant humidity control, but also achieve energy saving.

[0175] In some other embodiments of the present application, the controller performs the following constant humidity control:

[0176] Detect the actual indoor humidity RH;

[0177] If 80% < RH lasts for 5 minutes, the dehumidifier will run at dehumidification capacity Q1 for 10 minutes and then shut down;

[0178] If 50%<RH<80% for 5 minutes, the dehumidifier operates at dehumidification capacity Q2;

[0179] If 30%<RH<50% for 5 minutes, the humidifier will operate at humidification capacity Q3;

[0180] If RH < 30% for 5 minutes, the humidifier operates at humidification capacity Q4.

[0181] Continuously detect the indoor humidity RH, and perform gradient humidification and dehumidification control to ensure that the indoor humidity reaches the appropriate level.

[0182] In some embodiments of the present application, the water storage part of the humidifier is connected to the heat pump unit through a water pipeline; the water in the water storage part of the humidifier and the heat pump unit realize water circulation, which not only ensures the humidification water of the humidifier, but also ensures the cleanliness of the water in the water storage part of the humidifier due to the circulating flow of water.

[0183] The coil of the dehumidifier is also connected to the heat pump unit through a water pipeline to realize water circulation. When the dehumidifier is dehumidifying, the heat pump unit provides chilled water to the dehumidifier, and the dehumidifier uses the chilled water in its coil to cool and dehumidify.

[0184] The humidifier, dehumidifier and fan coil are connected to the water tank 5 of the heat pump unit through their own water inlet and outlet pipes, respectively, to realize water circulation with the heat pump unit.

[0185] like Figure 1 As shown, for ease of installation and use, the humidifier, dehumidifier and fresh air blower are integrated together to form a fresh air humidifying and dehumidifying machine 2. The fresh air humidifying and dehumidifying machine 2 has a fresh air mode (fresh air blower started), a humidifying mode (humidifier started), and a dehumidifying mode (dehumidifier started).

[0186] The air conditioning system of this embodiment also includes a variety of sensors, which are connected to the controller respectively. Figure 2 shown.

[0187] The return water temperature sensor is installed on the water inlet pipe of the heat pump unit to detect the return water temperature of the heat pump unit and send it to the controller.

[0188] The return air temperature sensor is installed at the return air outlet of the fan coil unit to detect the indoor return air temperature and send it to the controller.

[0189] Humidity sensors are installed on humidifiers and dehumidifiers to detect indoor humidity and send it to the controller.

[0190] The air quality detection module is installed on the fresh air fan and is used to detect indoor CO2 concentration, VOC value, PM2.5 concentration value, etc., and send them to the controller.

[0191] In some other embodiments of the present application, the controller is further configured to perform the following steps: Fig.11 shown.

[0192] Step S41: First, the operation of the fresh air fan is controlled according to the actual indoor air quality data. The fresh air fan is used to adjust the indoor air quality to achieve constant oxygen control. That is, the above steps S21 to S22 are executed.

[0193] Step S42: When the fresh air blower is stopped, the operation of the heat pump unit and the fan coil unit is controlled according to the indoor return air temperature and the indoor set temperature. The indoor temperature is adjusted by the heat pump unit and the fan coil unit to achieve constant temperature control. That is, the above steps S11 to S17 are executed.

[0194] Step S43: When the fan coil unit is shut down, the humidification / dehumidification amount and humidification time / dehumidification time of the humidifier / dehumidifier are controlled according to the actual indoor humidity. The humidifier and dehumidifier are used to adjust the indoor humidity to achieve constant humidity control. That is, the above steps S31 to S34 are executed.

[0195] By first using fresh air fans to adjust the indoor air quality, then using fan coil units to adjust the indoor temperature, and finally using humidifiers and dehumidifiers to adjust the indoor humidity, we can achieve constant oxygen, constant temperature and constant humidity control indoors to meet user needs and improve user experience.

[0196] The air conditioning system of this embodiment is a three-constant system, namely, constant oxygen, constant temperature, and constant humidity. Taking the heating mode as an example, when the heating mode is turned on in winter, the fresh air fan is first turned on for constant oxygen control to replace the indoor air so that the indoor CO2 concentration reaches the lowest; then the constant temperature adjustment control is performed, and the fan coil or floor heating mode is turned on to make the indoor temperature reach a comfortable temperature; then the indoor humidity control is performed, and the indoor temperature is appropriately humidified in winter to achieve the best constant temperature, humidity, and oxygen environment for the human body.

[0197] The air conditioning system of this embodiment is a three-constant energy-saving control system suitable for the climate environment of the whole region. Through the composite design of the water system and the fresh air system, a more comfortable and healthy modern indoor living environment is established; through the pre-diagnosis of temperature, humidity and CO2 content, gradient control is performed; frequent start and stop of equipment is avoided, the unit is more efficient and energy-saving, and a comfortable indoor air quality solution is provided.

[0198] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An air conditioning system, characterized in that: include: Heat pump units; A fan coil unit, which is connected to the heat pump unit through a water pipeline; A controller configured to: Get the indoor return air temperature Ta and indoor set temperature Td; When the difference between the indoor return air temperature Ta and the indoor set temperature Td meets the startup condition, the heat pump unit and the fan coil unit will start running; the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td will be calculated; when the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the shutdown condition, the heat pump unit will stop and the fan coil unit will keep running; When the difference between the return water temperature Ts of the heat pump unit and the indoor set temperature Td meets the shutdown condition, the heat pump unit is shut down and the fan coil unit keeps running, specifically including: When the difference between the indoor return air temperature Ta and the indoor set temperature Td meets the first startup temperature range, the heat pump unit is running, and the fan coil unit is running at the first preset wind speed; judging whether the absolute value of the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the first shutdown temperature range, when the absolute value of the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the first shutdown temperature range, the heat pump unit is shut down, and the fan coil unit maintains the first preset wind speed; When the difference between the indoor return air temperature Ta and the indoor set temperature Td meets the second startup temperature range, the heat pump unit is running, and the fan coil unit is running at the second preset wind speed; it is judged whether the absolute value of the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the second shutdown temperature range. When the absolute value of the difference between the heat pump unit return water temperature Ts and the indoor set temperature Td meets the second shutdown temperature range, the heat pump unit is shut down, and the fan coil unit maintains the second preset wind speed; The value within the first startup temperature range is greater than the value within the second startup temperature range; The upper limit value of the first shutdown temperature range is greater than the upper limit value of the second shutdown temperature range; The first preset wind speed is less than the second preset wind speed.

2. The air conditioning system according to claim 1, characterized in that: The controller is also configured to: When the difference between the indoor return air temperature Ta and the indoor set temperature Td does not meet the startup conditions, the heat pump unit shuts down. If the fan coil unit is in operation at this time, the fan coil unit shuts down after running for the set time.

3. The air conditioning system according to any one of claims 1 to 2, characterized in that: The air conditioning system further comprises: A fresh air fan, which is used to provide fresh air to the room; The controller is also configured to: Obtain actual indoor air quality data; Control the start and stop of the fresh air fan according to the actual indoor air quality data.

4. The air conditioning system according to claim 3, characterized in that: The control of starting and stopping the fresh air fan according to the actual indoor air quality data specifically includes: Determine whether the actual indoor air quality data is within the set concentration range; When the actual indoor air quality data is within the set concentration range, the deviation value rα between the actual indoor air quality data and the target air quality data is calculated; Calculate the deviation rate rα'=the deviation value rα calculated this time-the deviation value calculated last time; The speed of the fresh air fan is controlled according to the deviation value rα and deviation rate rα' calculated this time.

5. The air conditioning system according to claim 4, characterized in that: The control of the rotation speed of the fresh air fan according to the deviation value rα and the deviation rate rα' calculated this time specifically includes: When rα reaches the set deviation value and rα' reaches the set deviation rate, the fresh air fan runs at the first set speed; When rα reaches the set deviation value and rα' does not reach the set deviation rate, the fresh air fan runs at the second set speed; When rα does not reach the set deviation value, and rα' reaches the set deviation rate, the fresh air fan runs at the third set speed; When rα does not reach the set deviation value, and rα' does not reach the set deviation rate, the fresh air fan runs at the fourth set speed; Among them, the first set speed>the second set speed>the third set speed>the fourth set speed.

6. The air conditioning system according to claim 3, characterized in that: The controller is also configured to: When the actual indoor air quality data exceeds the upper limit of the set concentration range, the fresh air fan runs at the first set speed; When the actual indoor air quality data does not exceed the lower limit of the set concentration range, the fresh air fan will shut down.

7. The air conditioning system according to claim 3, characterized in that: The air conditioning system further comprises: Humidifiers and dehumidifiers to regulate indoor humidity; The controller is further configured to control the humidification amount of the humidifier / dehumidification amount of the dehumidifier and the humidification time of the humidifier / dehumidification time of the dehumidifier according to the actual indoor humidity.

8. The air conditioning system according to claim 7, characterized in that: The water storage part of the humidifier is connected to the heat pump unit through a water pipeline; the coil of the dehumidifier is also connected to the heat pump unit through a water pipeline.

9. The air conditioning system according to claim 7, characterized in that: The controller is also configured to: First, the operation of the fresh air fan is controlled according to the actual indoor air quality data; When the fresh air fan stops, the operation of the heat pump unit and fan coil unit is controlled according to the indoor return air temperature and indoor set temperature; When the fan coil unit is shut down, the humidification amount of the humidifier / dehumidification amount of the dehumidifier and the humidification time of the humidifier / dehumidification time of the dehumidifier are controlled according to the actual indoor humidity.

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