CN115540092A - Air-conditioning unit and method for controlling the air-conditioning unit - Google Patents

Abstract

The invention discloses an air conditioning unit and an air conditioning unit control method, relates to the field of air conditioners, and aims to reduce energy consumption of the air conditioning unit. The air conditioning unit comprises a first air inlet section, a second air inlet section, a surface cooler assembly and an air feeder section. The first air inlet section comprises a first air inlet and a first air outlet which are communicated with each other through fluid. The second air inlet section comprises a second air inlet and a second air outlet which are communicated by fluid; the second air inlet section and the first air inlet section are switched between connection and disconnection. The surface cooler assembly is arranged at the downstream of the first air inlet section and the second air inlet section. The air blower section comprises a third air inlet and a third air outlet which are communicated with each other through fluid; the third air inlet is positioned at the downstream of the surface cooler assembly; and the fluid conveyed by the first air inlet section and the second air inlet section passes through the surface air cooler assembly and then enters the third air inlet. Above-mentioned technical scheme has realized that the air inlet temperature is adjusted and control more easily, and air conditioning unit's energy consumption is lower.

Description

Air-conditioning unit and method for controlling the air-conditioning unit

technical field

The invention relates to the field of air conditioning, in particular to an air conditioning unit and a control method for the air conditioning unit.

Background technique

In recent years, nuclear power, as a clean and stable energy source, has continuously increased the electricity consumption of the whole society. According to statistics, as of December 2021, my country has 53 nuclear power units in operation, with a total nuclear power installed capacity of 54.65 million kilowatts, accounting for 5.02% of the country's cumulative power generation, which is relatively small compared to the 10% global nuclear power generation. huge. In this context, it is estimated that by 2025, my country's nuclear power installed capacity will be about 70 million kilowatts; by 2030, the nuclear power installed capacity will reach 120 million kilowatts, and nuclear power generation will account for about 8% of the country's total power generation. At the same time, the demand for air-conditioning units for nuclear power is increasing day by day. Due to the special working environment of nuclear power plants, the performance, stability and shock resistance of air-conditioning units are higher than those for daily commercial air-conditioning units. Moreover, air-conditioning units operate throughout the year, which is also beneficial to green energy saving. Certain goals and requirements.

The inventors have found that there are at least the following problems in the prior art: the combined air-conditioning unit is an important part of the air-conditioning unit. After the air is processed by the surface cooler, the air is sent into the room, and the temperature of the air often cannot meet the demand. Therefore, other operations need to be added, such as heating the air to make the air temperature meet the usage requirements, which increases the energy consumption of the air conditioning unit.

Contents of the invention

The invention provides an air conditioner unit and a control method for the air conditioner unit, which are used to reduce the energy consumption of the air conditioner unit.

An embodiment of the present invention provides an air conditioning unit, including:

The first air inlet section includes a fluidly connected first air inlet and a first air outlet; the first air inlet is used to receive fresh air;

The second air inlet section includes a second air inlet and a second air outlet in fluid communication; the second air inlet section and the first air inlet section are switched between connection and disconnection;

A surface cooler assembly installed downstream of the first air inlet section and the second air inlet section to cool the airflow output by the first air outlet and the second air outlet;

The blower section includes a fluidly connected third air inlet and a third air outlet; the third air inlet is located downstream of the surface cooler assembly; the first air inlet section and the second air inlet section convey All fluids enter the third air inlet after passing through the surface cooler assembly.

In some embodiments, the surface cooler assembly includes:

The first surface cooling section includes a first surface cooler; the first surface cooler is arranged downstream of the first air outlet of the first air inlet section to cool the airflow output by the first air inlet section ;as well as

The second surface cooling section includes a second surface cooler; the second surface cooler is arranged downstream of the second air outlet of the second air inlet section to cool the airflow output by the second air inlet section ;

Wherein, the fluid conveyed by the first air inlet section enters the blower section after passing through the first surface cooling section and the third air inlet; the fluid conveyed by the second air inlet section passes through the second surface The cold section and the third air inlet also enter the blower section.

In some embodiments, the air conditioning unit further includes:

A switching valve, arranged between the first air inlet section and the second air inlet section, to switch the connection and disconnection states of the first air inlet section and the second air inlet section, and to adjust the communication The size of the opening in the state.

In some embodiments, the air conditioning unit further includes:

A temperature measuring element is installed at the third air outlet to detect the air outlet temperature of the third air outlet.

In some embodiments, the air conditioning unit further includes:

A controller is signal-connected to both the switching valve and the temperature measuring element; the controller is configured to control the valve position of the switching valve according to the temperature signal measured by the temperature measuring element.

In some embodiments, the first surface cooler includes a first refrigerant pipeline, and the second surface cooler includes a second refrigerant pipeline; the air conditioning unit further includes:

The first water supply pipeline is in fluid communication with the inlet of the first refrigerant pipeline of the first surface cooling section;

The first water outlet pipeline is in fluid communication with the outlet of the first refrigerant pipeline of the first surface cooling section;

The second water supply pipeline is in fluid communication with the inlet of the second refrigerant pipeline of the second surface cooling section;

The second water outlet pipeline is in fluid communication with the outlet of the second refrigerant pipeline of the second surface cooling section; the first water outlet pipeline and the second water supply pipeline can be selectively connected or disconnected switch between; and

The main engine includes an outlet and a return outlet; the first water supply pipeline and the second water supply pipeline are both in fluid communication with the outlet of the main engine; the first water outlet pipeline and the second water outlet The water pipelines are all in fluid communication with the return port of the host.

In some embodiments, the air conditioning unit further includes:

a bypass valve, arranged between the first water outlet pipeline and the return port of the host; and

The self-operated temperature control valve is arranged between the first water outlet pipeline, the bypass valve and the second water supply pipeline, so as to output the first water outlet pipeline and the outlet of the host The temperature of the water is adjusted and sent to the second water supply pipeline.

The embodiment of the present invention also provides an air-conditioning unit control method, which is realized by using the air-conditioning unit provided by any technical solution of the present invention, and the method includes the following steps:

According to the difference between the actual air outlet temperature and the set air outlet temperature of the blower section of the air conditioning unit, the air inlet ratio and/or connection state of the first air inlet section and the second air inlet section are controlled, so as to Make the outlet air temperature of the blower section meet the requirement.

In some embodiments, the air conditioning unit control method further includes the following steps:

When the difference between the actual air outlet temperature of the blower section and the set air outlet temperature is greater than the set upper limit threshold, the first air inlet section and the second air supply section are connected to reduce the first The temperature in the supply air section.

In some embodiments, after the first air inlet section and the second air supply section are fully connected, the difference between the actual outlet temperature of the fan section and the set outlet temperature is still greater than the set upper threshold , take the following steps: reduce the temperature of the water entering the surface cooler assembly, so as to reduce the temperature of the airflow passing through the surface cooler assembly.

In some embodiments, the set upper threshold is 0.3°C to 0.7°C.

In some embodiments, the air-conditioning unit control method further includes the following step: when the difference between the actual outlet air temperature of the blower section and the set outlet air temperature is less than the set lower limit threshold, increasing the intake of the surface cooler assembly water temperature to increase the airflow temperature through the surface cooler assembly.

In some embodiments, after the inlet water temperature of the surface cooler assembly reaches the upper threshold, and the difference between the actual outlet temperature of the blower section and the set outlet temperature is still less than the set lower threshold, the following steps are taken: Step: reducing the opening degree of the communication valve between the first air inlet section and the second air supply section to increase the temperature in the second air supply section.

In some embodiments, the set lower threshold is -0.3°C to -0.7°C.

In some embodiments, the air conditioning unit control method further includes the following steps: if the difference between the actual outlet air temperature of the blower section and the set outlet air temperature is between the set upper limit threshold and the set lower limit threshold, maintaining the air conditioner The operating status of the unit remains unchanged.

The air conditioning unit provided by the above technical solution has a first air inlet section and a second air inlet section, and the two can work independently or communicate with each other. The first air inlet section and the second air inlet section are connected to different air supply sources, so that the airflow temperatures in the first air inlet section and the second air inlet section can be different. According to actual control requirements, the first air inlet section and the second air inlet section can also be fluidly connected, so that the temperatures of the two can be closer. The above technical solution makes it easier to adjust and control the inlet air temperature, so that the recent air-conditioning outlet air can meet the requirements more, and does not require additional heating and other operations, the performance of the air-conditioning unit is improved, and the energy consumption is lower.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is a schematic structural diagram of an air conditioning unit provided by an embodiment of the present invention.

Fig. 2 is a schematic diagram of the refrigerant flow structure at the surface cooler assembly of the air conditioning unit provided by the embodiment of the present invention;

Fig. 3 is a schematic diagram of an air conditioning unit control method provided by an embodiment of the present invention.

Reference signs:

1. The first air inlet section; 2. The second air inlet section; 3. Surface cooler assembly; 4. Blower fan section; 5. Switching valve; 6. Temperature measuring element; 8. Main engine;

11. The first air inlet; 12. The first air outlet; 21. The second air inlet; 22. The second air outlet; 31. The first surface cooling section; 32. The second surface cooling section; 41. The third air inlet ; 42, the third air outlet;

311, the first surface cooler; 311a, the first refrigerant pipeline; 321, the second surface cooler; 321a, the second refrigerant pipeline; 71, the first water supply pipeline; 72, the first water outlet pipeline; 73, The second water supply pipeline; 74, the second water outlet pipeline; 75, the bypass valve; 76, the self-operated temperature control valve.

detailed description

The technical solutions provided by the present invention will be described in more detail below in conjunction with FIGS. 1 to 3 .

An embodiment of the present invention provides an air-conditioning unit, which is especially suitable for a combined air-conditioning unit. The air-conditioning unit has multiple modes such as cooling and heating. In the following, the air conditioner unit is in the cooling mode as an example for introduction. In the cooling mode, the air blown by the air conditioner unit into the room is cold air.

The air conditioning unit includes a first air intake section 1 , a second air intake section 2 , a surface cooler assembly 3 and a blower section 4 .

The first air inlet section 1 and the second air inlet section 2 are arranged side by side up and down, and may communicate with each other or be independent of each other. The first air inlet section 1 is located at the bottom, and the second air inlet section 2 is located at the top. The first air intake section 1 enters air from the left and exits from the right. The second air intake section 2 enters the air from the top surface and exits from the right side. The right end faces of the first air inlet section 1 and the second air inlet section 2 are flush. Such an arrangement makes it easier to arrange the air duct, and makes the position of the components more reasonable and compact.

The air flow has the following three flow directions: first, the air in the first air inlet section 1 flows to the surface cooler assembly 3, and then to the blower section 4. This flow path is called the fresh air flow path, as shown by arrow S1 in FIG. 2 . In the second type, the air in the second air inlet section 2 flows to the surface cooler assembly 3 and then to the blower section 4. This flow path is called the return air flow path, as shown by arrow S2 in FIG. 2 . In the third way, the air from the first air inlet section 1 flows to the second air inlet section 2, the surface cooler assembly 3, and then to the blower section 4, and this flow path is called the regulating flow path. The fresh air flow path and the return air flow path can exist at the same time. The fresh air flow path, the return air flow path, and the adjustment flow path can also exist at the same time.

The first air inlet section 1 , the second air inlet section 2 , the surface cooler assembly 3 and the blower section 4 each adopt a box structure to form a structure as shown in FIG. 1 . The first air inlet section 1 and the second air inlet section 2 are separated by a partition, and a switching valve 5 is arranged on the partition to control whether the first air inlet section 1 and the second air inlet section 2 are connected and connected. The size of the area, that is, the switching between the connection and disconnection of the second air inlet section 2 and the first air inlet section 1, and the adjustment of the opening degree in the connection state.

The first air inlet section 1 is used to introduce fresh air, and the first air inlet section 1 includes a first air inlet 11 and a first air outlet 12 in fluid communication. The first air inlet 11 of the first air inlet section 1 is directly connected to the fresh air system, and the first air inlet 11 is used to receive fresh air. A first air intake regulating valve may be installed at the first air inlet 11 to control the flow of fresh air entering the first air intake section 1 . The first air intake section 1 is located at the bottom, and a wet cooling coil is arranged inside the first air intake section 1 . Wet cooling coils may produce condensation.

The second air inlet section 2 is used to lead the return air of the air conditioner unit back into the air conditioner unit. The second air inlet section 2 includes a second air inlet 21 and a second air outlet 22 in fluid communication. A second air intake regulating valve may be installed at the second air inlet 21 to control the return air flow into the second air intake section 2 . The second air intake section 2 is located at the top, and a dry cooling coil is arranged inside the second air intake section 2 . Dry cooling coils produce little to no condensation.

The surface cooler assembly 3 is installed downstream of the first air inlet section 1 and the second air inlet section 2 to cool the airflow output from the first air outlet 12 and the second air outlet 22 .

In some embodiments, the surface cooler assembly 3 includes a first surface cooling section 31 and a second surface cooling section 32 . The first surface cooling section 31 includes a first surface cooler 311 ; the first surface cooler 311 is arranged downstream of the first air outlet 12 of the first air inlet section 1 to cool the airflow output by the first air inlet section 1 . The second surface cooling section 32 includes a second surface cooler 321; the second surface cooler 321 is arranged downstream of the second air outlet 22 of the second air inlet section 2 to cool the airflow output by the second air inlet section 2; The surface cooling section 31 and the second surface cooling section 32 are independent. Among them, the fluid delivered by the first air inlet section 1 enters the fan section 4 after passing through the first surface cooling section 31 and the third air inlet 41; the fluid delivered by the second air inlet section 2 passes through the second surface cooling section 32 and the third air inlet section 4; Also enter blower section 4 behind tuyere 41. Referring to Fig. 1, the first surface cooling section 31 and the second surface cooling section 32 are two independent boxes, and the same box can also be used, and a partition is arranged in the box to divide into two independent boxes. small box.

Referring to FIG. 1 , in some embodiments, a combined filter section is provided upstream of the blower section 4 and downstream of the surface cooler assembly 3 . Combined filter segments include multiple filter elements. The airflow passing through the surface cooler assembly 3 all enters the combined filter section for filtering.

Referring to Fig. 1, the blower section 4 includes a fluidly connected third air inlet 41 and a third air outlet 42; the third air inlet 41 is located downstream of the surface cooler assembly 3; the first air inlet section 1, the second air inlet section 2 The transported fluid passes through the surface cooler assembly 3 and then enters the third air inlet 41; the third air outlet 42 of the blower section 4 is in fluid communication with the second air inlet 21, so as to lead the return air of the air conditioning unit back to the air conditioning unit.

Referring to FIG. 1 and FIG. 2 , the refrigerant flow path of the surface cooler assembly 3 is introduced below. In some embodiments, the first surface cooler 311 includes a first refrigerant pipeline 311a, and the second surface cooler 321 includes a second refrigerant pipeline 321a. The air conditioning unit also includes a first water supply pipeline 71 , a first water outlet pipeline 72 , a second water supply pipeline 73 , a second water outlet pipeline 74 and a host 8 . The first water supply pipeline 71 is in fluid communication with the inlet of the first refrigerant pipeline 311 a of the first surface cooling section 31 . The first water outlet pipeline 72 is in fluid communication with the outlet of the first refrigerant pipeline 311 a of the first surface cooling section 31 . The second water supply pipeline 73 is in fluid communication with the inlet of the second refrigerant pipeline 321 a of the second surface cooling section 32 . The second water outlet pipeline 74 is in fluid communication with the outlet of the second refrigerant pipeline 321a of the second surface cooling section 32; the first water outlet pipeline 72 and the second water supply pipeline 73 can be selectively switched between connected and disconnected states . The main engine 8 includes an outlet 81 and a return opening 82; the first water supply pipeline 71 and the second water supply pipeline 73 are in fluid communication with the outlet 81 of the main engine 8; the first water outlet pipeline 72 and the second water outlet pipeline 74 Both are in fluid communication with the return port 82 of the host machine 8 .

The first surface cooler 311 bears the heat exchange load of the fresh air, and the second surface cooler 321 bears the load of the return air. When the air conditioning unit is in cooling mode, the temperature of the fresh air is higher than that of the return air.

The main engine 8 outputs chilled water, and the temperature of the chilled water is, for example, 5°C to 7°C. If the temperature of the chilled water needs to be higher, the chilled water temperature output by the host 8 is set to be close to 7°C. If the temperature of the chilled water is required to be lower, the chilled water temperature output by the main engine 8 is set to be close to 5°C.

In the technical solution provided by the embodiment of the present invention, since the first air inlet section 1 and the second air inlet section 2 are provided, the fresh air entering by the air conditioning unit only accounts for a part of the total air volume. Compared with the technical solution in which all fresh air is used in the related art, the return air temperature is lower than the fresh air in the cooling mode, and the water flow required by the surface cooler assembly 3 of the technical solution of the embodiment of the present invention is less than that of the entire air conditioning unit. Adopting the water flow required by the fresh air reduces the energy consumption of the main engine 8 .

In some embodiments, the air conditioning unit further includes a bypass valve 75 and a self-operated temperature control valve 76 . The bypass valve 75 is disposed between the first water outlet pipeline 72 and the return port 82 of the host machine 8 . The self-operated temperature control valve 76 is arranged between the first water outlet pipeline 72, the bypass valve 75 and the second water supply pipeline 73, so as to adjust the temperature of the outlet water of the first water outlet pipeline 72 and the second water outlet pipeline 74 before delivering To the second water supply pipeline 73.

The water outlet temperature of the first surface cooler 311 is higher than the outlet water temperature of the main engine 8, and all or part of the outlet water of the first surface cooler 311 with higher temperature is introduced into the second surface cooler 321 as the inlet of the second surface cooler 321. Water can make the outlet water temperature of the second surface cooler 321 increase accordingly, and all the outlet water of the second surface cooler 321 is returned to the host machine 8 . In this way, the temperature difference between the inlet water temperature of the main engine 8 and the return water temperature of the main engine 8 is increased, thereby realizing the effect of saving energy consumption.

The self-operated temperature control valve 76 can set a control temperature, which is higher than the dew point temperature passing through the second surface cooler 321 and also higher than the dew point temperature of the return air. The self-operated temperature control valve 76 automatically adjusts the ratio of the water outlet of the first surface cooler 311 and the water outlet of the main engine 8, so that the temperature of the water entering the second surface cooler 321 meets the requirements. After the self-operated temperature control valve 76 is adjusted, if only part of the outlet water of the first surface cooler 311 is introduced into the second surface cooler 321 , the remaining outlet water of the first surface cooler 311 flows back to the main engine 8 through the bypass valve 75 . The self-operated temperature control valve 76 operates stably. The above-mentioned technical solution is especially suitable for nuclear power air-conditioning units, and can make the air-conditioning units operate stably.

Continuing to refer to FIG. 1 , in some embodiments, the air-conditioning unit further includes a temperature measuring element 6 installed at the third air outlet 42 to detect the air temperature of the third air outlet 42 .

In order to collect the temperature of each position of the air conditioning unit, in some embodiments, temperature sensors are provided at the first air inlet 11 , the second air inlet 21 , the first surface cooler 311 , and the second surface cooler 321 . The temperature of each place is collected by the temperature sensor to regulate the air conditioning unit.

In some embodiments, the air-conditioning unit further includes a controller, and the controller is signal-connected to the switch valve 5 and the temperature measuring element 6; the controller is configured to control the valve of the switch valve 5 according to the temperature signal measured by the temperature measuring element 6. bit.

The controller adopts the following control logic: when the difference between the actual air outlet temperature and the set air outlet temperature of the air conditioning unit is between the set upper limit threshold and the set lower limit threshold, it means that the operation of the air conditioner unit meets the requirements and does not need to be adjusted. .

If the outlet air temperature of the air conditioner is higher than the set upper threshold, it means that the outlet air temperature of the air conditioner is too high. Since the air conditioner is in cooling mode, the outlet air temperature of the air conditioner is lower than the air inlet Two options: 1. Process the airflow, that is, reduce the temperature of the fresh air in the first air inlet section 1, so that the outlet air temperature of the final air conditioning unit is reduced; 2. Lower the temperature of the refrigerant in the surface cooler assembly 3, so that After 3, the airflow temperature is lower.

Among the above two methods, the first method is more energy-saving. Specifically, the switching valve 5 between the first air inlet section 1 and the second air inlet section 2 can be opened, so that the first air inlet section 1 and the second air inlet section 2 are connected, and the second air inlet section 2 is gradually increased. The return air in the air enters the first air intake section 1, and the temperature of the airflow is lowered by mixing the fresh air and the return air.

The above two methods can be superimposed to achieve better control effect. Specifically, when the effect achieved by adjusting the switching valve 5 between the first air inlet section 1 and the second air inlet section 2 alone still does not meet the requirements, the inlet water temperature of the surface cooler assembly 3 can be lowered so that the surface cooling The device assembly 3 has a better cooling effect on the airflow.

If the difference between the actual air outlet temperature of the air conditioner and the set air outlet temperature is less than the set upper threshold, it means that the air outlet temperature of the air conditioner is too low. Since the air conditioner is in cooling mode, the air outlet temperature of the air conditioner is lower than the air conditioner At this time, there are two options for the air intake of the unit: 1. To process the air flow, that is, to increase the fresh air temperature of the first air intake section 1, so as to increase the final air temperature of the air conditioning unit; 2. To increase the temperature of the surface cooler assembly 3 Refrigerant temperature, so that the airflow temperature after passing through the surface cooler assembly 3 is higher.

Among the above two methods, the first method is specifically as follows: the switching valve 5 between the first air inlet section 1 and the second air inlet section 2 is gradually closed, so that the first air inlet section 1 and the second air inlet section The communication area of section 2 becomes smaller, gradually reducing the amount of the return air in the second air inlet section 2 entering into the first air inlet section 1, so as to increase the airflow temperature in the first air inlet section 1 . The second way is specifically as follows: at least part of the outlet water of the first surface cooler 311 can be introduced into the second surface cooler 321 to increase the inlet water temperature of the second surface cooler 321; or directly increase the outlet water of the main engine 8 temperature.

The above two methods can be superimposed to achieve better control effect. Specifically, when the effect achieved by adjusting the switching valve 5 between the first air inlet section 1 and the second air inlet section 2 alone still does not meet the requirements, the water inlet temperature of the surface cooler assembly 3 and the temperature of the main engine 8 can be increased. The temperature of the outlet water increases the temperature of the airflow passing through the surface cooler assembly 3 .

Referring to Fig. 3, the embodiment of the present invention also provides an air-conditioning unit control method, which is realized by using the air-conditioning unit provided by any technical solution of the present invention. The air-conditioning unit control method includes the following steps: The difference between the temperature and the set outlet air temperature controls the air inlet ratio and/or connection state of the first air inlet section 1 and the second air inlet section 2, so that the outlet air temperature of the blower section 4 meets the requirements.

In Fig. 3, t is _{set as} the set air outlet temperature, and t is set as the set _air outlet temperature. The upper limit threshold is set to be, for example, 0.3° C. to 0.7° C., and 0.5° C. is taken as an example in some embodiments shown in FIG. 3 . The lower limit threshold is set to be -0.3°C to -0.7°C, and -0.5°C is taken as an example in some embodiments shown in FIG. 3 .

In some embodiments, the air conditioning unit control method further includes the following steps: when the difference between the actual air outlet temperature of the blower section 4 and the set air outlet temperature is greater than the set upper limit threshold, the first air inlet section 1 and the second air inlet section The air supply section is connected to reduce the temperature in the first air supply section.

In some embodiments, after the first air inlet section 1 and the second air supply section are fully connected, when the difference between the actual outlet air temperature of the fan section 4 and the set outlet air temperature is still greater than the set upper limit threshold, the following measures are taken: Step: reduce the water inlet temperature of the surface cooler assembly 3, so as to reduce the airflow temperature passing through the surface cooler assembly 3. Complete communication means that the opening degree of the switching valve 5 is 100%.

In some embodiments, the air-conditioning unit control method further includes the following steps: when the difference between the actual air outlet temperature of the blower section 4 and the set air outlet temperature is less than the set lower limit threshold, increasing the water inlet temperature of the surface cooler assembly 3 , to increase the temperature of the airflow passing through the surface cooler assembly 3. Set the lower limit threshold to be set according to the working conditions.

In some embodiments, after the water inlet temperature of the surface cooler assembly 3 reaches the upper threshold, and the difference between the actual outlet temperature of the blower section 4 and the set outlet temperature is still less than the set lower threshold, the following steps are taken: Reduce the opening of the communication valve between the first air inlet section 1 and the second air supply section to increase the temperature in the second air supply section. The upper limit threshold is set as needed.

The following introduces FIG. 3 to introduce in detail the judging process of the air conditioning unit control method provided by the embodiment of the present invention.

The temperature measuring element 6 collects the outlet air temperature of the air conditioning unit in real time. According _to the difference between the actual outlet air temperature t and the _set outlet temperature t, the whole control method can be divided into three branches.

The first branch: if _tsupply -t>0.5, it means that the temperature of the air supply (or outlet air) of the air conditioning unit _is too high. The air supply temperature value of the air conditioning unit should be reduced, correspondingly, the air volume corresponding to the first air inlet section 1 on the wet cooling side can be increased or the inlet water temperature of the surface cooler assembly 3 can be lowered. For energy-saving considerations, the method of increasing the cooling side air volume is given priority. Specifically, it is necessary to open the switching valve 5 to mix part of the return air with the fresh air to reduce the temperature of the fresh air in the first air inlet section 1. After being processed by the first surface cooler 311 , mixed with the remaining return air in the second air inlet section 2 and then sent into the room. If the difference still does not meet the demand after the opening of the switching valve 5 reaches 100%, then a method of reducing the inlet water temperature of the surface cooler assembly 3 is adopted at this time in order to meet the demand. In some cases, if the inlet water temperature of the surface cooler assembly 3 still cannot meet the requirements after reaching the lower limit, return to "Start", and a message will be displayed on the control terminal, and the automatic controller will check and debug the system or change the setting conditions.

The second branch: If _tsupply -t _{is set} <-0.5, it means that the supply air temperature of the air conditioning unit is too low, and the outlet air temperature needs to be increased at this time. Specifically, the inlet water temperature of the second surface cooler 321 can be increased first, and whether the difference is satisfied after the adjustment is checked. If the inlet water temperature of the second surface cooler 321 reaches the upper limit and the above-mentioned difference is still less than -0.5°C, then the opening degree of the switching valve 5 needs to be reduced at this time. If the switching valve 5 is reduced to 0% and still does not meet the requirements, then return to "Start", prompt information at the control terminal, and the automatic controller checks the debugging system or changes the setting conditions.

The third branch is: -0.5<t _send -t _set <0.5, it means that the operation of the system meets the requirements. At this time, the temperature of the inlet water and the working state of the switching valve 5 are kept unchanged.

In the above process, the preset change value of the opening of the switching valve 5 is 1%/s, and the preset value of the water temperature change is 0.1° C./s.

In addition, in the spring and autumn seasons, in order to make full use of the outdoor fresh air, the first air intake regulating valve maintains an opening of 70%, and the second air intake regulating valve maintains an opening of 30%. In the autumn and winter seasons, in order to ensure indoor ventilation, the first air intake regulating valve maintains an opening of 30%, and the second air intake regulating valve maintains an opening of 70%.

In describing the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying It means that the device or element referred to must have a specific orientation, be constructed and operated for a specific orientation, and thus cannot be construed as limiting the protection content of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (16)

1. An air conditioning assembly, comprising:

the first air inlet section (1) comprises a first air inlet (11) and a first air outlet (12) which are communicated with each other through fluid; the first air inlet (11) is used for receiving fresh air;

the second air inlet section (2) comprises a second air inlet (21) and a second air outlet (22) which are communicated with each other through fluid; the second air inlet section (2) and the first air inlet section (1) are switched between connection and disconnection;

the surface air cooler assembly (3) is arranged at the downstream of the first air inlet section (1) and the second air inlet section (2) and is used for cooling air flows output by the first air outlet (12) and the second air outlet (22); and

the air blower section (4) comprises a third air inlet (41) and a third air outlet (42) which are communicated with each other through fluid; the third air inlet (41) is located downstream of the surface cooler assembly (3); and the fluid conveyed by the first air inlet section (1) and the second air inlet section (2) passes through the surface air cooler assembly (3) and then enters the third air inlet (41).

2. Air conditioning assembly according to claim 1, characterized in that the surface cooler assembly (3) comprises:

a first surface cooling section (31) comprising a first surface cooler (311); the first surface air cooler (311) is arranged at the downstream of the first air outlet (12) of the first air inlet section (1) so as to cool the air flow output by the first air inlet section (1); and

a second surface cooling stage (32) comprising a second surface cooler (321); the second surface air cooler (321) is arranged at the downstream of the second air outlet (22) of the second air inlet section (2) so as to cool the air flow output by the second air inlet section (2);

the fluid conveyed by the first air inlet section (1) enters the air blower section (4) after passing through the first surface cooling section (31) and the third air inlet (41); and fluid conveyed by the second air inlet section (2) also enters the air feeder section (4) after passing through the second surface cooling section (32) and the third air inlet (41).

3. The air conditioning assembly as set forth in claim 1, further comprising:

and the switching valve (5) is arranged between the first air inlet section (1) and the second air inlet section (2) to switch the communication and disconnection states of the first air inlet section (1) and the second air inlet section (2) and adjust the opening degree in the communication state.

4. The air conditioning assembly as set forth in claim 3, further comprising:

and the temperature measuring element (6) is arranged at the third air outlet (42) to detect the air outlet temperature of the third air outlet (42).

5. The air conditioning assembly as set forth in claim 4, further comprising:

the controller is in signal connection with the switching valve (5) and the temperature measuring element (6); the controller is configured to control the valve position of the switching valve (5) based on the temperature signal measured by the temperature measuring element (6).

6. The air conditioning assembly as set forth in claim 2 wherein the first surface air cooler (311) includes a first refrigerant line (311 a) and the second surface air cooler (321) includes a second refrigerant line (321 a); the air conditioning unit further includes:

a first water supply line (71) in fluid communication with an inlet of a first refrigerant line (311 a) of the first surface cooling stage (31);

a first water outlet pipeline (72) which is in fluid communication with an outlet of a first refrigerant pipeline (311 a) of the first surface cooling section (31);

a second water supply line (73) in fluid communication with an inlet of a second refrigerant line (321 a) of the second surface cooling stage (32);

a second water outlet pipeline (74) which is in fluid communication with an outlet of a second refrigerant pipeline (321 a) of the second surface cooling section (32); -the first water outlet line (72) and the second water inlet line (73) are selectively switchable between a connected and a disconnected state; and

a main unit (8) including an outlet (81) and a return (82); the first water supply line (71), the second water supply line (73) are both in fluid communication with an outlet (81) of the main machine (8); the first and second water outlet lines (72, 74) are both in fluid communication with a return port (82) of the host machine (8).

7. The air conditioning assembly as set forth in claim 6, further comprising:

a bypass valve (75) disposed between the first outlet line (72) and a return port (82) of the main machine (8); and

and the self-operated temperature control valve (76) is arranged among the first water outlet pipeline (72), the bypass valve (75) and the second water supply pipeline (73) and is used for adjusting the temperature of water output by the first water outlet pipeline (72) and the outflow port (81) of the main machine (8) and then conveying the water to the second water supply pipeline (73).

8. Air conditioning assembly according to claim 1, characterized in that the second air intake section (2) is located at the top of the first air intake section (1).

9. An air conditioning unit control method, characterized in that, the method is realized by the air conditioning unit of any one of claims 1 to 8, and the method comprises the following steps:

and controlling the air inlet proportion and/or the communication state of the first air inlet section (1) and the second air inlet section (2) according to the difference value between the actual air outlet temperature and the set air outlet temperature of the air blower section (4) of the air conditioning unit, so that the air outlet temperature of the air blower section (4) meets the requirement.

10. The air conditioning unit control method according to claim 9, characterized by further comprising the steps of:

and when the difference value between the actual air outlet temperature of the air blower section (4) and the set air outlet temperature is greater than a set upper limit threshold value, the first air inlet section (1) is communicated with the second air supply section so as to reduce the temperature in the first air supply section.

11. The air conditioning unit control method according to claim 10, wherein after the first air intake section (1) and the second air supply section are completely communicated, when the difference between the actual outlet air temperature of the air supply section (4) and the set outlet air temperature is still greater than the set upper threshold, the following steps are taken:

reducing the inlet water temperature of the surface cooler assembly (3) to reduce the temperature of the air flow passing through the surface cooler assembly (3).

12. The air conditioning unit control method according to claim 10, wherein the set upper threshold is 0.3 to 0.7 ℃.

13. The air conditioning unit control method according to claim 9, characterized by further comprising the steps of:

and when the difference value between the actual air outlet temperature of the air feeder section (4) and the set air outlet temperature is smaller than the set lower limit threshold value, the water inlet temperature of the surface air cooler assembly (3) is increased so as to increase the temperature of the air flow passing through the surface air cooler assembly (3).

14. The air conditioning unit control method according to claim 13, wherein after the inlet water temperature of the surface cooler assembly (3) reaches the upper threshold, and the difference between the actual outlet air temperature of the blower section (4) and the set outlet air temperature is still smaller than the set lower threshold, the following steps are taken:

and the opening degree of a communication valve between the first air inlet section (1) and the second air supply section is reduced so as to increase the temperature in the second air supply section.

15. The air conditioning unit control method according to claim 13, characterized in that the set lower threshold is-0.3 to-0.7 ℃.

16. The air conditioning unit control method according to claim 9, characterized by further comprising the steps of:

and if the difference value between the actual air outlet temperature of the air blower section (4) and the set air outlet temperature is between the set upper limit threshold and the set lower limit threshold, keeping the running state of the air conditioning unit unchanged.

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