Heat pump fresh air system and control method thereof

Abstract

The invention relates to the field of building energy conservation and environment control, in particular to a heat pump fresh air system and a control method thereof.The system comprises a heat pump host, a fresh air subsystem, a sensor module, a controller, a water pump and a circulation subsystem; the method comprises the steps of setting an operation mode and target temperature and humidity parameters; then real-time temperature, real-time humidity and real-time air speed are obtained according to an outlet water temperature sensor, an indoor temperature and humidity sensor and an air supply speed sensor; and finally, the controller controls the heat pump host, the fresh air subsystem and the water pump and circulation subsystem according to the real-time temperature, the real-time humidity and the real-time air speed. Therefore, the water temperature and the fresh air volume of the heat pump host can be dynamically adjusted according to indoor and outdoor environment changes, indoor temperature and humidity are kept constant, energy consumption is reduced, and comfort is improved.

Description

Technical Field

[0001] The present invention relates to the field of building energy conservation and environmental control, and more specifically, to a heat pump fresh air system and a control method thereof. Background Art

[0002] With the improvement of modern buildings and living standards, people's requirements for indoor air quality (IAQ) and temperature and humidity comfort are constantly increasing. Traditional air conditioning systems (HVAC, Heating, Ventilation and Air Conditioning) mainly focus on temperature regulation, and it is difficult to accurately control humidity at the same time. Especially in high humidity areas or under environmental changes in different seasons, traditional systems are prone to problems such as insufficient humidity regulation and excessive energy consumption. In the past, the design of HVAC systems often ignored the problem of humidity regulation, especially in areas with high humidity in summer, where humidity is often difficult to control; in winter, the air may be too dry. Existing air conditioning systems are difficult to achieve precise regulation of the indoor environment under complex environmental conditions, resulting in reduced indoor comfort and high energy consumption during system operation. In addition, with the continuous improvement of national requirements for carbon emissions and energy efficiency, the development of energy-saving technologies in the construction field is particularly urgent. The heat pump fresh air system combines the advantages of heat pump technology and fresh air system, and can provide cooling, heating, dehumidification and fresh air ventilation functions at the same time. It is particularly suitable for air conditioning needs in high humidity and high load environments. However, how to accurately control indoor temperature and humidity under complex load conditions and how to improve the energy saving and automatic adjustment capabilities of the system have become important research directions in the industry. Therefore, there is an urgent need for an intelligent control system that can dynamically adjust the water temperature and fresh air volume of the heat pump host according to changes in the indoor and outdoor environment, maintain constant indoor temperature and humidity, reduce energy consumption and improve comfort.

[0003] The prior art discloses a fresh air system, a heat pump water temperature adjustment method, a device and a storage medium, and relates to the field of heat pump control systems. This solution adjusts the water temperature of the circulating water output by the heat pump unit, thereby controlling the heat pump unit to output circulating water with a corresponding water temperature to meet the temperature and humidity adjustment in different modes, that is, this solution sets a series fresh air system to fully utilize the water temperature of the circulating water output by the heat pump unit, that is, the fresh air fan unit uses the corresponding water temperature to adjust the humidity, and the fan coil unit can use the circulating water after passing through the fresh air fan unit to perform hot and cold treatment on the indoor return air to adjust the temperature, thereby realizing independent control of temperature and humidity. However, it is still impossible to dynamically adjust the water temperature of the heat pump host and the fresh air volume according to changes in the indoor and outdoor environment, maintain the constant indoor temperature and humidity, reduce energy consumption and improve comfort. Summary of the invention

[0004] The purpose of the present invention is to disclose a heat pump fresh air system with higher comfort and a control method thereof.

[0005] In order to achieve the above object, the present invention provides a heat pump fresh air system, comprising:

[0006] Includes: heat pump host, fresh air subsystem, sensor module, controller, water pump and circulation subsystem;

[0007] The sensor module includes: water outlet temperature sensor, indoor temperature and humidity sensor, and air supply speed sensor;

[0008] Outlet water temperature sensor: installed on the outlet side of the heat pump host, detects the outlet water temperature data and transmits the outlet water temperature to the controller;

[0009] Indoor temperature and humidity sensor: A temperature and humidity sensor installed indoors to detect indoor temperature and humidity data and transmit the indoor temperature and humidity data to the controller;

[0010] Air supply speed sensor: An anemometer installed at the air outlet of the fresh air subsystem to detect the change data of the air volume and transmit the change data of the air volume to the controller;

[0011] The controller is respectively connected to the heat pump host, the fresh air subsystem, the sensor module, the water pump and the circulation subsystem, and controls the operation of the heat pump host, the fresh air subsystem, the sensor module, the water pump and the circulation subsystem;

[0012] In addition, the present invention also provides a heat pump fresh air control method, which is applied to the above-mentioned heat pump fresh air system, comprising:

[0013] S1: Set the operation mode and target temperature and humidity parameters;

[0014] S2: obtaining the real-time temperature, real-time humidity and real-time wind speed according to the water outlet temperature sensor, the indoor temperature and humidity sensor and the air supply speed sensor;

[0015] S3: The controller controls the heat pump host, fresh air subsystem, water pump and circulation subsystem according to the real-time temperature, real-time humidity and real-time wind speed, and then returns to execute step S2 until the heat pump fresh air system is turned off.

[0016] Further, in step S1, the operation modes include: cooling dehumidification, isothermal dehumidification, isothermal humidification and heating humidification;

[0017] Cooling and dehumidification:

[0018] At the same time, it reduces the temperature and humidity of the air, which is suitable for high temperature and high humidity environment in summer;

[0019] Water temperature: Maintain at a low temperature range of 7-12°C to enhance the cooling effect and promote the condensation of water vapor in the air;

[0020] Air volume: Increase the air volume to 1500~2000m 3 / h, ensuring that the air temperature drops rapidly and the humidity is significantly reduced;

[0021] Isothermal Dehumidification:

[0022] It means to reduce the air humidity while keeping the indoor temperature basically unchanged. It is suitable for the situation where the indoor temperature is suitable but the humidity is high.

[0023] Water temperature: set at 12-16°C, lower than the dew point of the indoor air but higher than the cooling temperature to achieve the effect of dehumidification only;

[0024] Air volume: 1200~1600m 3 / h, avoid rapid cooling and ensure that the air temperature does not change significantly;

[0025] Isothermal humidification:

[0026] Increase the humidity in the air without changing the air temperature;

[0027] Water temperature: Set the water temperature higher than the room temperature, 22-26°C, to avoid air cooling;

[0028] Air volume: Keep the air volume at 1000~1400m 3 / h, to avoid excessive air flow and reduce the humidification effect;

[0029] Heating and humidification

[0030] Increase air temperature and humidity at the same time;

[0031] Water temperature: Keep at 30-45℃, which is enough to heat the air and raise the room temperature.

[0032] Air volume: 1200~1600m 3 / h.

[0033] Furthermore, in step S1, the user sets the target temperature and humidity parameters according to his / her own needs. If no setting is made, the default values ​​of the target temperature and humidity parameters are: target temperature range: 25-26°C; target humidity range: 55%-60%.

[0034] Further, in step S3, when the real-time temperature is greater than the target temperature range by 2°C and the real-time humidity is greater than the target temperature range by 5%, the water temperature is lowered by 0.5°C and the air volume is increased by 10%.

[0035] Further, in step S3, when the real-time temperature is greater than the target temperature range by 2°C and the real-time humidity is less than the target temperature range, the water temperature is lowered by 0.5°C and the air volume is kept unchanged.

[0036] Further, in step S3, when the real-time temperature is within the target temperature range or the difference with the target temperature range is less than 2°C, and the real-time humidity is greater than the target temperature range, the water temperature is lowered by 0.2°C and the air volume is increased by 5%.

[0037] Further, in step S3, when the real-time temperature is within the target temperature range or the difference with the target temperature range is less than 2°C, and the real-time humidity is less than the target temperature range, the water temperature is kept unchanged and the air volume is kept unchanged.

[0038] Further, in step S3, when the real-time temperature is lower than the target temperature range and the real-time humidity is higher than the target temperature range, the water temperature is increased by 0.3°C and the air volume is kept unchanged.

[0039] Further, in step S3, when the real-time temperature is lower than the target temperature range and the real-time humidity is lower than the target temperature range, the water temperature is increased by 0.5°C and the air volume is reduced by 10%.

[0040] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0041] The present invention sets the operation mode and target temperature and humidity parameters; then obtains the real-time temperature, real-time humidity and real-time wind speed according to the outlet water temperature sensor, indoor temperature and humidity sensor and air supply speed sensor; finally, the controller controls the heat pump host, fresh air subsystem, water pump and circulation subsystem according to the real-time temperature, real-time humidity and real-time wind speed. Thus, the water temperature and fresh air volume of the heat pump host can be dynamically adjusted according to the changes in the indoor and outdoor environment, the indoor temperature and humidity can be kept constant, energy consumption can be reduced and comfort can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic structural diagram of a heat pump fresh air system according to Example 1;

[0043] Figure 2 This is a flow chart of a heat pump fresh air system control method described in Example 2;

[0044] in Figure 1 Among them, 1: heat pump host; 2: fresh air subsystem; 3-1: water outlet temperature sensor; 3-2: indoor temperature and humidity sensor; 3-3: air supply speed sensor; 4: controller; 5: water pump and circulation system; DETAILED DESCRIPTION

[0045] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0046] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0047] Embodiment 1:

[0048] This embodiment provides Figure 1 A control method for a heat pump fresh air system is shown, comprising:

[0049] Heat pump host 1, fresh air subsystem 2, sensor module 3, controller 4 and water pump and circulation subsystem 5;

[0050] The sensor module 3 includes: a water outlet temperature sensor 3-1, an indoor temperature and humidity sensor 3-2, and an air supply speed sensor 3-3;

[0051] Outlet water temperature sensor 3-1: installed on the outlet side of the heat pump host, detects the outlet water temperature data and transmits the outlet water temperature to the controller;

[0052] Indoor temperature and humidity sensor 3-2: A temperature and humidity sensor installed indoors to detect indoor temperature and humidity data and transmit the indoor temperature and humidity data to the controller;

[0053] Air supply speed sensor 3-3: An anemometer installed at the air outlet of the fresh air subsystem to detect the change data of the air volume and transmit the change data of the air volume to the controller;

[0054] The controller 4 is respectively connected to the heat pump host 1, the fresh air subsystem 2, the sensor module 3, and the water pump and circulation subsystem 5, and controls the operation of the heat pump host 1, the fresh air subsystem 2, the sensor module 3, and the water pump and circulation subsystem 5;

[0055] This embodiment sets the operation mode and target temperature and humidity parameters; then obtains the real-time temperature, real-time humidity and real-time wind speed according to the outlet water temperature sensor 3-1, the indoor temperature and humidity sensor 3-2 and the air supply speed sensor 3-3; finally, the controller 4 controls the heat pump host 1, the fresh air subsystem 2 and the water pump and circulation subsystem 5 according to the real-time temperature, real-time humidity and real-time wind speed. Thus, the water temperature and fresh air volume of the heat pump host 1 can be dynamically adjusted according to the changes in the indoor and outdoor environment, the indoor temperature and humidity can be kept constant, the energy consumption can be reduced and the comfort can be improved.

[0056] Embodiment 2:

[0057] This embodiment provides Figure 2 A heat pump fresh air system control method is shown, comprising:

[0058] S1: Set the operation mode and target temperature and humidity parameters;

[0059] S2: obtaining the real-time temperature, real-time humidity and real-time wind speed according to the water outlet temperature sensor, the indoor temperature and humidity sensor and the air supply speed sensor;

[0060] S3: The controller controls the heat pump host, fresh air subsystem, water pump and circulation subsystem according to the real-time temperature, real-time humidity and real-time wind speed, and then returns to execute step S2 until the heat pump fresh air system is turned off.

[0061] This embodiment sets the operation mode and target temperature and humidity parameters; then obtains the real-time temperature, real-time humidity and real-time wind speed according to the outlet water temperature sensor, indoor temperature and humidity sensor and air supply speed sensor; finally, the controller controls the heat pump host, fresh air subsystem, water pump and circulation subsystem according to the real-time temperature, real-time humidity and real-time wind speed. Thus, the water temperature and fresh air volume of the heat pump host can be dynamically adjusted according to the changes in the indoor and outdoor environment, the indoor temperature and humidity can be kept constant, energy consumption can be reduced and comfort can be improved.

[0062] Embodiment three:

[0063] This embodiment further discloses on the basis of the second embodiment:

[0064] Further, in step S1, the operation modes include: cooling dehumidification, isothermal dehumidification, isothermal humidification and heating humidification;

[0065] Cooling and dehumidification:

[0066] At the same time, it reduces the temperature and humidity of the air, which is suitable for high temperature and high humidity environment in summer;

[0067] Water temperature: Maintain at a low temperature range of 7-12°C to enhance the cooling effect and promote the condensation of water vapor in the air;

[0068] Air volume: Increase the air volume to 1500~2000m 3 / h, ensuring that the air temperature drops rapidly and the humidity is significantly reduced;

[0069] Isothermal Dehumidification:

[0070] It means to reduce the air humidity while keeping the indoor temperature basically unchanged. It is suitable for the situation where the indoor temperature is suitable but the humidity is high.

[0071] Water temperature: set at 12-16°C, lower than the dew point of the indoor air but higher than the cooling temperature to achieve the effect of dehumidification only;

[0072] Air volume: 1200~1600m 3 / h, avoid rapid cooling and ensure that the air temperature does not change significantly;

[0073] Isothermal humidification:

[0074] Increase the humidity in the air without changing the air temperature;

[0075] Water temperature: Set the water temperature higher than the room temperature, 22-26°C, to avoid air cooling;

[0076] Air volume: Keep the air volume at 1000~1400m 3 / h, to avoid excessive air flow and reduce the humidification effect;

[0077] Heating and humidification

[0078] Increase air temperature and humidity at the same time;

[0079] Water temperature: Keep at 30-45℃, which is enough to heat the air and raise the room temperature.

[0080] Air volume: 1200~1600m 3 / h.

[0081] Furthermore, in step S1, the user sets the target temperature and humidity parameters according to his / her own needs. If no setting is made, the default values ​​of the target temperature and humidity parameters are: target temperature range: 25-26°C; target humidity range: 55%-60%.

[0082] Further, in step S3, when the real-time temperature is greater than the target temperature range by 2°C and the real-time humidity is greater than the target temperature range by 5%, the water temperature is lowered by 0.5°C and the air volume is increased by 10%.

[0083] Further, in step S3, when the real-time temperature is greater than the target temperature range by 2°C and the real-time humidity is less than the target temperature range, the water temperature is lowered by 0.5°C and the air volume is kept unchanged.

[0084] Further, in step S3, when the real-time temperature is within the target temperature range or the difference with the target temperature range is less than 2°C, and the real-time humidity is greater than the target temperature range, the water temperature is lowered by 0.2°C and the air volume is increased by 5%.

[0085] Further, in step S3, when the real-time temperature is within the target temperature range or the difference with the target temperature range is less than 2°C, and the real-time humidity is less than the target temperature range, the water temperature is kept unchanged and the air volume is kept unchanged.

[0086] Further, in step S3, when the real-time temperature is lower than the target temperature range and the real-time humidity is higher than the target temperature range, the water temperature is increased by 0.3°C and the air volume is kept unchanged.

[0087] Further, in step S3, when the real-time temperature is lower than the target temperature range and the real-time humidity is lower than the target temperature range, the water temperature is increased by 0.5°C and the air volume is reduced by 10%.

[0088] This embodiment sets the operation mode and target temperature and humidity parameters; then obtains the real-time temperature, real-time humidity and real-time wind speed according to the outlet water temperature sensor, indoor temperature and humidity sensor and air supply speed sensor; finally, the controller controls the heat pump host, fresh air subsystem, water pump and circulation subsystem according to the real-time temperature, real-time humidity and real-time wind speed. Thus, the water temperature and fresh air volume of the heat pump host can be dynamically adjusted according to the changes in the indoor and outdoor environment, the indoor temperature and humidity can be kept constant, energy consumption can be reduced and comfort can be improved.

[0089] Embodiment 4:

[0090] This embodiment provides a control method for a heat pump fresh air system, including:

[0091] By adjusting the water temperature and air volume of the heat pump fresh air system, a variety of indoor air treatment modes can be flexibly implemented to meet different temperature and humidity requirements. Specifically, the following four modes can be used: cooling dehumidification, isothermal dehumidification, isothermal humidification and heating humidification. These four modes rely on the precise adjustment of water temperature (cold water or hot water) and air volume to control the temperature and humidity changes of indoor air.

[0092] Cooling and dehumidification

[0093] Cooling and dehumidification refers to reducing the temperature and humidity of the air at the same time, and is often used in high temperature and high humidity environments in summer.

[0094] Control principle:

[0095] Water temperature: Lower the water temperature (usually lower than the dew point temperature of the indoor air, such as 7-12°C) to cool the air below the dew point, causing water vapor to condense and reduce the humidity in the air.

[0096] Air volume: Increase the air volume appropriately to enhance the heat exchange between air and cold water and reduce the air temperature.

[0097] Control strategy:

[0098] Water temperature: Maintain in the low temperature range of **7~12℃** to enhance the cooling effect and promote the condensation of water vapor in the air.

[0099] Air volume: Increase the air volume appropriately (1500~2000m 3 / h), ensuring that the air temperature drops rapidly and the humidity is significantly reduced.

[0100] Expected results:

[0101] Temperature: The indoor temperature drops.

[0102] Humidity: Humidity has dropped significantly, and the air has become drier and fresher.

[0103] Application scenarios:

[0104] It is suitable for hot and humid environments in summer, especially for the rainy season in the south.

[0105] Isothermal dehumidification

[0106] Isothermal dehumidification means reducing air humidity while keeping the indoor temperature basically unchanged. It is suitable for situations where the indoor temperature is relatively suitable but the humidity is high.

[0107] Control principle:

[0108] Water temperature: The water temperature is slightly lower than the indoor temperature (such as 12-16°C), which removes moisture from the air but does not significantly change the air temperature.

[0109] Air volume: Control the air volume appropriately to avoid overcooling and keep the air temperature constant.

[0110] Control strategy:

[0111] Water temperature: set to 12-16°C, lower than the dew point of the indoor air but higher than the significant cooling temperature to achieve the effect of dehumidification only.

[0112] Air volume: moderate air volume (1200~1600m 3 / h) to avoid rapid cooling and ensure that the air temperature does not change significantly.

[0113] Expected results:

[0114] Temperature: The indoor temperature is kept constant.

[0115] Humidity: Humidity drops significantly and the air becomes drier but the temperature does not drop.

[0116] Application scenarios:

[0117] An environment with suitable room temperature but high humidity is common in spring, autumn or rainy season.

[0118] Isothermal humidification

[0119] Isothermal humidification is to increase the humidity in the air without changing the air temperature. It is usually suitable for winter or when the air in the air-conditioned room is too dry.

[0120] Control principle:

[0121] Water temperature: Water temperature close to or higher than the room temperature (such as 22-26°C) is used to treat the air to avoid cooling, while directly increasing the water vapor content in the air through humidification devices (such as steam humidification or spray humidification).

[0122] Air volume: Keep the air volume low to avoid excessive air flow resulting in poor humidification effect, and avoid overcooling.

[0123] Control strategy:

[0124] Water temperature: Set the water temperature close to or higher than room temperature, about 22-26°C, to avoid air cooling.

[0125] Air volume: Maintain a small air volume (1000~1400m 3 / h) to avoid excessive air flow that would reduce the humidification effect.

[0126] Expected results:

[0127] Temperature: The temperature remains basically unchanged.

[0128] Humidity: As humidity rises, indoor air becomes more humid, alleviating dryness issues.

[0129] Application scenarios:

[0130] The dry northern environment in winter, or the dry environment caused by long-term operation of the air-conditioned room.

[0131] Heating and humidification

[0132] Heating and humidification refers to increasing the air temperature and humidity at the same time. It is usually used in cold and dry environments, such as in the north for heating in winter or in areas with cold outdoor climates.

[0133] Control principle:

[0134] Water temperature: Use hot water (e.g. 30-45°C) to heat the air and raise the air temperature. At the same time, use humidification equipment or use moisture in outdoor air to increase humidity.

[0135] Air volume: Control the air volume to allow the heated air to mix fully with the indoor air while avoiding over-drying.

[0136] Control strategy:

[0137] Water temperature: Keep at 30-45℃, which is enough to heat the air and raise the room temperature.

[0138] Air volume: moderate air volume (1200~1600m 3 / h), enhancing air flow while preventing rapid wind speed from carrying away too much moisture.

[0139] Expected results:

[0140] Temperature: Room temperature rises.

[0141] Humidity: As humidity increases, the air becomes warmer and more humid.

[0142] Application scenarios:

[0143] In the cold and dry winter, there is a demand for humidification in the northern heating area or air-conditioning heating environment.

[0144] Comparison of four modes

[0145]

[0146] The three-aunt and four-aunt library is controlled based on two key variables:

[0147] Water temperature regulation: The water temperature of the heat pump main unit controls the sensible heat and latent heat in the air. It is mainly used for temperature regulation and also has a dehumidification effect. Changes in water temperature directly affect the cooling or heating effect of the air.

[0148] Air volume regulation: The air volume of the fresh air system controls the heat exchange rate of the air, affects the speed of temperature change, and determines the contact time between the air and water temperature, affecting the efficiency of humidity regulation.

[0149] Adjustment logic

[0150] Through real-time collection of temperature and humidity data, the system automatically determines the difference between the current indoor environment and the target setting, and makes dynamic adjustments based on preset strategies.

[0151] When the indoor temperature is too high (for example, higher than the target temperature T_target+2°C), the system accelerates the cooling process by lowering the water temperature and increasing the air volume.

[0152] When the indoor humidity is too high (for example, higher than the target humidity RH_target+5%), the system appropriately lowers the water temperature and increases the air volume to enhance the dehumidification effect of the air.

[0153] When the indoor temperature is too low, the system heats the room by increasing the water temperature and appropriately reducing the air volume to maintain air humidity.

[0154] When the indoor environment is close to the target temperature and humidity, the system enters energy-saving mode to keep the water temperature and air volume stable and reduce frequent adjustment operations.

[0155] According to the changes in indoor temperature and humidity, the system adjusts the heat pump water temperature and fresh air volume to ensure that the temperature and humidity are maintained within a comfortable range. The following is a table of adjustment strategies based on different indoor conditions:

[0156]

[0157] Parameterized strategy description:

[0158] Parameterization of target temperature and humidity: T_target and RH_target in the table represent the target temperature and target humidity respectively. Users can set these parameters according to personal needs or building environment. The default values ​​are:

[0159] Target temperature (T_target): 25~26℃

[0160] Target humidity (RH_target): 55% to 60%

[0161] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A heat pump fresh air system, characterized in that: include: Heat pump host, fresh air subsystem, sensor module, controller, water pump and circulation subsystem; The sensor module includes: water outlet temperature sensor, indoor temperature and humidity sensor, and air supply speed sensor; Outlet water temperature sensor: installed on the outlet side of the heat pump host, detects the outlet water temperature data and transmits the outlet water temperature to the controller; Indoor temperature and humidity sensor: A temperature and humidity sensor installed indoors to detect indoor temperature and humidity data and transmit the indoor temperature and humidity data to the controller; Air supply speed sensor: An anemometer installed at the air outlet of the fresh air subsystem to detect the change data of the air volume and transmit the change data of the air volume to the controller; The controller is respectively connected to the heat pump host, the fresh air subsystem, the sensor module, the water pump and the circulation subsystem, and controls the operation of the heat pump host, the fresh air subsystem, the sensor module, the water pump and the circulation subsystem.

2. A method for controlling fresh air from a heat pump, applied to a fresh air system from a heat pump as claimed in claim 1, characterized in that: include: S1: Set the operation mode and target temperature and humidity parameters; S2: obtaining the real-time temperature, real-time humidity and real-time wind speed according to the water outlet temperature sensor, the indoor temperature and humidity sensor and the air supply speed sensor; S3: The controller controls the heat pump host, fresh air subsystem, water pump and circulation subsystem according to the real-time temperature, real-time humidity and real-time wind speed, and then returns to execute step S2 until the heat pump fresh air system is turned off.

3. A heat pump fresh air control method according to claim 2, characterized in that: In step S1, the operation modes include: cooling dehumidification, isothermal dehumidification, isothermal humidification and heating humidification; Cooling and dehumidification: At the same time, it reduces the temperature and humidity of the air, which is suitable for high temperature and high humidity environment in summer; Water temperature: Maintain at a low temperature range of 7-12°C to enhance the cooling effect and promote the condensation of water vapor in the air; Air volume: Increase the air volume to 1500~2000m 3 / h, ensuring that the air temperature drops rapidly and the humidity is significantly reduced; Isothermal Dehumidification: It means to reduce the air humidity while keeping the indoor temperature basically unchanged. It is suitable for the situation where the indoor temperature is suitable but the humidity is high. Water temperature: set at 12-16°C, lower than the dew point of the indoor air but higher than the cooling temperature to achieve the effect of dehumidification only; Air volume: 1200~1600m 3 / h, avoid rapid cooling and ensure that the air temperature does not change significantly; Isothermal humidification: Increase the humidity in the air without changing the air temperature; Water temperature: Set the water temperature higher than the room temperature, 22-26°C, to avoid air cooling; Air volume: Keep the air volume at 1000~1400m 3 / h, to avoid excessive air flow and reduce the humidification effect; Heating and humidification Increase air temperature and humidity at the same time; Water temperature: Keep at 30-45℃, which is enough to heat the air and raise the room temperature. Air volume: 1200~1600m 3 / h.

4. A heat pump fresh air control method according to claim 3, characterized in that: In step S1, the user sets the target temperature and humidity parameters according to his / her needs. If no setting is made, the default values ​​of the target temperature and humidity parameters are: target temperature range: 25-26°C; target humidity range: 55%-60%.

5. A heat pump fresh air control method according to claim 2, characterized in that: In step S3, when the real-time temperature is greater than the target temperature range by 2°C and the real-time humidity is greater than the target temperature range by 5%, the water temperature is lowered by 0.5°C and the air volume is increased by 10%.

6. A heat pump fresh air control method according to claim 2, characterized in that: In step S3, when the real-time temperature is greater than the target temperature range by 2°C and the real-time humidity is less than the target temperature range, the water temperature is lowered by 0.5°C and the air volume is kept unchanged.

7. A heat pump fresh air control method according to claim 2, characterized in that: In step S3, when the real-time temperature is within the target temperature range or the difference with the target temperature range is less than 2°C, and the real-time humidity is greater than the target temperature range, the water temperature is lowered by 0.2°C and the air volume is increased by 5%.

8. A heat pump fresh air control method according to claim 2, characterized in that: In step S3, when the real-time temperature is within the target temperature range or the difference with the target temperature range is less than 2°C, and the real-time humidity is less than the target temperature range, the water temperature is kept unchanged and the air volume is kept unchanged.

9. A heat pump fresh air control method according to claim 2, characterized in that: In step S3, when the real-time temperature is lower than the target temperature range and the real-time humidity is higher than the target temperature range, the water temperature is increased by 0.3°C and the air volume is kept unchanged.

10. A heat pump fresh air control method according to claim 2, characterized in that: In step S3, when the real-time temperature is lower than the target temperature range and the real-time humidity is lower than the target temperature range, the water temperature is increased by 0.5°C and the air volume is reduced by 10%.

Images