Double-cold-source fresh air system and suspended ceiling structure

Abstract

The utility model relates to a double-cold-source fresh air system and a ceiling structure, the double-cold-source fresh air system comprises a compressor, a first heat exchanger, an air duct and a liquid inlet pipe, a second heat exchanger, an evaporator, a condenser and a fan are sequentially arranged in the air duct, and one end of the liquid inlet pipe is used for being connected with an external cooling water source; the other end is connected with the water inlet end of the first heat exchanger and the water inlet end of the second heat exchanger through a distributive pipe; the water outlet end of the first heat exchanger is connected with a first liquid outlet pipe, the water outlet end of the second heat exchanger is connected with a second liquid outlet pipe, and proportional valves are arranged on the first liquid outlet pipe and the second liquid outlet pipe. According to the double-cold-source fresh air system and the ceiling structure, the double-path water outlet design and the proportional valve are adopted, independent and accurate control over the plate heat exchanger and the coil heat exchanger is achieved, the refined regulation and control means endows the system with the more accurate control capacity for the air supply temperature and humidity, and a more comfortable and pleasant indoor environment is created.

Description

Technical Field

[0001] The utility model relates to the technical field of dehumidification systems, in particular to a dual-cold-source fresh air system and a suspended ceiling structure. Background Art

[0002] With the improvement of people's living standards and the strengthening of environmental awareness, indoor air quality has received increasing attention. To improve indoor air quality, fresh air systems are widely used in residences, office buildings, schools, hospitals and other places. Traditional fresh air systems mainly rely on introducing fresh outdoor air to dilute indoor pollutants, but they have the following limitations: First, traditional fresh air systems usually only perform simple filtration and ventilation, and are unable to adjust the temperature and humidity of the introduced fresh air. Especially in summer and winter, this can cause indoor temperatures to be too high or too low, affecting comfort. Second, to maintain a comfortable indoor temperature and humidity, air conditioning and other equipment are required to adjust the fresh air, which increases energy consumption and is not conducive to energy conservation and environmental protection.

[0003] In order to overcome the limitations of traditional fresh air systems, dual cooling source technology has been introduced into the fresh air system. Dual cooling source technology refers to the use of two cooling sources with different temperatures (such as cooling water and chilled water) to process fresh air, which can achieve precise control of fresh air temperature and humidity and improve energy efficiency.

[0004] However, the existing dual-cooling source fresh air system still has room for improvement in terms of temperature and humidity control accuracy, energy efficiency, and user experience. For example, the proportional control of chilled water is not precise enough, resulting in large fluctuations in the supply air temperature and the inability to achieve precise temperature control. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a dual-cold-source fresh air system and a ceiling structure for precise control of temperature and humidity.

[0006] In order to achieve the above-mentioned objectives, in the first aspect, an embodiment of the present application provides a dual-cold source fresh air system, including a compressor, a first heat exchanger and an air duct, wherein a second heat exchanger, an evaporator, a condenser and a fan are sequentially arranged in the air duct, and the output end of the compressor is connected to the first heat exchanger in one way and to the condenser in the other way; the output end of the condenser and the output end of the first heat exchanger are both connected to the input end of the evaporator, and the output end of the evaporator is connected to the input end of the compressor, and also includes a liquid inlet pipe, one end of the liquid inlet pipe is used to connect to an external cooling water source, and the other end is connected to the water inlet end of the first heat exchanger and the water inlet end of the second heat exchanger through a water distribution pipe; the water outlet end of the first heat exchanger is connected to a first liquid outlet pipe, and the water outlet end of the second heat exchanger is connected to a second liquid outlet pipe, and a proportional valve is provided on the first liquid outlet pipe and the second liquid outlet pipe.

[0007] In order to achieve better heat exchange effect, the first heat exchanger is a plate heat exchanger and the second heat exchanger is a coil heat exchanger.

[0008] In order to improve the quality of the incoming air, an air filter is provided on the air inlet side of the second heat exchanger.

[0009] In order to improve the temperature and humidity control accuracy, a controller is also included. The air supply end of the air duct is provided with a first temperature sensor and a humidity sensor electrically connected to the controller; the output end of the compressor is connected to a three-way valve, one end of the three-way valve is connected to the first heat exchanger, and the other end is connected to the condenser through a solenoid valve; the output end of the first heat exchanger is connected to a first electronic expansion valve, and the output end of the condenser is connected to a second electronic expansion valve, and the output ends of the first electronic expansion valve and the second electronic expansion valve are connected in parallel to the input end of the evaporator; the solenoid valve, the first electronic expansion valve and the second electronic expansion valve are all electrically connected to the controller.

[0010] A further solution is that the output end of the compressor is provided with a second temperature sensor and a first pressure sensor electrically connected to the controller, and the input end of the compressor is provided with a third temperature sensor and a second pressure sensor electrically connected to the controller.

[0011] In order to increase the humidification function, a humidifier is further included. The humidifier is arranged in the air duct and located between the condenser and the fan.

[0012] In order to better meet the indoor humidification needs, the humidifier is a wet film humidifier.

[0013] In a second aspect, an embodiment of the present application provides a suspended ceiling structure having a dual-cold source fresh air system as described in any embodiment of the first aspect.

[0014] The dual-cooling-source fresh air system and ceiling structure designed in this utility model differ from the crude temperature and humidity control methods of dual-condensing dehumidification systems in related technologies. By adopting a dual-water outlet design and proportional valves, it achieves independent and precise control of the plate heat exchanger and coil heat exchanger. This refined control method gives the system more precise control over the supply air temperature and humidity, creating a more comfortable and pleasant indoor environment. Furthermore, the system also integrates a wet-film humidifier, enabling it to regulate indoor humidity, especially in dry winters. This can effectively increase indoor humidity, prevent the discomfort caused by excessively dry air, and further enhance the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the system structure of the dual-cold source fresh air system provided in an embodiment of the present application.

[0016] Among them: compressor 10, three-way valve 11, solenoid valve 12, second temperature sensor 13, first pressure sensor 14, third temperature sensor 15, second pressure sensor 16, first heat exchanger 20, first liquid outlet pipe 21, first electronic expansion valve 22, air duct 30, first temperature sensor 31, humidity sensor 32, second heat exchanger 40, second liquid outlet pipe 41, evaporator 50, condenser 60, second electronic expansion valve 61, fan 70, liquid inlet pipe 80, proportional valve 90, air filter 42, humidifier 100. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0018] Example 1

[0019] like Figure 1 As shown, in the first aspect, the embodiment of the present application provides a dual-cold source fresh air system, including a compressor 10, a first heat exchanger 20 and an air duct 30, wherein the air duct 30 is sequentially provided with a second heat exchanger 40, an evaporator 50, a condenser 60 and a fan 70, the output end of the compressor 10 is connected to the first heat exchanger 20 in one way and to the condenser 60 in the other way; the output end of the condenser 60 and the output end of the first heat exchanger 20 are both connected to the input end of the evaporator 50, and the output end of the evaporator 50 is connected to the input end of the compressor 10, and also includes a liquid inlet pipe 80, one end of the liquid inlet pipe 80 is used to connect to an external cooling water source, and the other end is connected to the water inlet end of the first heat exchanger 20 and the water inlet end of the second heat exchanger 40 through a water distribution pipe; the water outlet end of the first heat exchanger 20 is connected to the first liquid outlet pipe 21, and the water outlet end of the second heat exchanger 40 is connected to the second liquid outlet pipe 41, and the first liquid outlet pipe 21 and the second liquid outlet pipe 41 are both provided with a proportional valve 90.

[0020] like Figure 1 As shown, when working, for example: an external cooling water source enters the system through the liquid inlet pipe 80, and is divided into two paths through a water distribution pipe (such as a three-way valve): one path enters the first heat exchanger 20, exchanges heat with the refrigerant, and is discharged through the first liquid outlet pipe 21; the other path enters the second heat exchanger 40, pre-cools the fresh air, and is discharged through the second liquid outlet pipe 41. Subsequently, the fan 70 is started to drive the outdoor fresh air into the air duct 30. The fresh air first passes through the second heat exchanger 40. Since cooling water flows in the second heat exchanger 40, the fresh air will be pre-cooled to reduce its temperature. Then, the pre-cooled fresh air enters the evaporator 50, further reducing the temperature and humidity to achieve a dehumidification effect, and the pre-cooled fresh air can reduce the dehumidification load of the evaporator 50 and improve the energy efficiency of the system.

[0021] Specifically, in the dehumidification mode, the compressor 10 starts and compresses the refrigerant into a high-temperature and high-pressure gas. This high-temperature and high-pressure gaseous refrigerant is divided into two paths. One path directly enters the condenser 60, exchanges heat with the fresh air in the air duct 30, releases part of the heat, and condenses into a medium-temperature and high-pressure liquid. The other path enters the first heat exchanger 20, exchanges heat with the cooling water, releases part of the heat, and is also converted into a medium-temperature and high-pressure liquid. At this time, the two medium-temperature and high-pressure liquids converge at the inlet of the evaporator 50 and enter the evaporator after being throttled and reduced in pressure by the expansion valve. 50. In the evaporator 50, the refrigerant absorbs the heat of the fresh air and evaporates into a low-temperature, low-pressure gas. That is, the water vapor in the fresh air passing through the evaporator 50 condenses into dew to complete dehumidification. The fresh air after dehumidification and cooling continues to flow and enters the condenser 60. In the condenser 60, the fresh air absorbs the heat released by the refrigerant and the temperature is increased. Finally, the heated fresh air is sent into the room by the fan 70 to ensure the stability of the indoor temperature and humidity, and the low-temperature, low-pressure refrigerant vapor in the evaporator 50 is sucked into the compressor 10 to start the next cycle.

[0022] During this process, the first liquid outlet pipe 21 and the second liquid outlet pipe 41 pass through the proportional valve 90 provided thereon. The proportional valve 90 can precisely adjust the valve opening, thereby achieving precise control of the cooling water flow through the first heat exchanger 20 and the second heat exchanger 40. If the indoor temperature is too high and the supply air temperature needs to be lowered, the proportional valve 90 on the first liquid outlet pipe 21 can be controlled to open wider, increasing the cooling water flow through the first heat exchanger 20, lowering the refrigerant temperature, and thus lowering the supply air temperature. If the indoor humidity is too high and the dehumidification effect needs to be enhanced, the proportional valve 90 on the second liquid outlet pipe 41 can be controlled to open narrower, reducing the cooling water flow through the second heat exchanger 40, increasing the refrigerant temperature entering the evaporator 50, and thus enhancing the dehumidification effect. In this way, different from the extensive temperature and humidity adjustment method of the double condensation dehumidification system in the related art, a proportional valve 90 is set on the first liquid outlet pipe 21 and the second liquid outlet pipe 41, which can achieve precise control of the cooling water flow, giving the system more precise control over the supply air temperature and humidity, and effectively improving the user experience.

[0023] In this embodiment, the first heat exchanger 20 is a plate heat exchanger, and the second heat exchanger 40 is a coil heat exchanger. Plate heat exchangers offer advantages such as high heat exchange efficiency, compact size, light weight, and ease of maintenance. In this system, the first heat exchanger 20 is primarily used to cool the high-temperature, high-pressure refrigerant discharged from the compressor 10, requiring high heat exchange efficiency. Therefore, a plate heat exchanger is a more suitable choice. Coil heat exchangers, on the other hand, have a simpler structure, lower cost, and better pressure resistance. In this system, the second heat exchanger 40 is primarily used to pre-cool the fresh air, requiring relatively low heat exchange efficiency. Therefore, a coil heat exchanger is a more economical and practical choice.

[0024] In some embodiments, as Figure 1As shown, an air filter 42 is provided on the air inlet side of the second heat exchanger 40. In practice, the provision of air filter 42 is a simple but effective measure. It effectively filters out dust, pollen, PM2.5, and other particulate matter from the incoming air, thereby improving the quality of the air entering the air duct 30 and providing cleaner fresh air to the user. Furthermore, the filtered clean air reduces dust and impurities entering the system, thereby protecting components such as the second heat exchanger 40, evaporator 50, and fan 70, extending their service life and reducing maintenance costs.

[0025] In some embodiments, as Figure 1 As shown, in order to improve the temperature and humidity control accuracy, a controller (not shown) is further included, and the air supply end of the air duct 30 is provided with a first temperature sensor 31 and a humidity sensor 32 electrically connected to the controller; the output end of the compressor 10 is connected to a three-way valve 11, one end of the three-way valve 11 is connected to the first heat exchanger 20, and the other end is connected to the condenser 60 through the solenoid valve 12; the output end of the first heat exchanger 20 is connected to a first electronic expansion valve 22, and the output end of the condenser 60 is connected to a second electronic expansion valve 61, and the output ends of the first electronic expansion valve 22 and the second electronic expansion valve 61 are connected in parallel to the input end of the evaporator 50; the solenoid valve 12, the first electronic expansion valve 22 and the second electronic expansion valve 61 are all electrically connected to the controller.

[0026] In specific implementations, the controller serves as the system's control center, receiving sensor data and controlling the operating status of various components according to pre-set programs or user-defined parameters. During operation, the first temperature sensor 31 and humidity sensor 32 monitor the supply air temperature and humidity in real time and transmit this data to the controller. Based on the sensor data and pre-set parameters, the controller determines whether the current temperature and humidity meet the set values. If the temperature and humidity are too high or too low, the controller controls the solenoid valve 12, the first electronic expansion valve 22, and the second electronic expansion valve 61 to adjust the refrigerant flow rate, further achieving precise control of the supply air temperature and humidity.

[0027] In this embodiment, if Figure 1As shown, the output end of the compressor 10 is provided with a second temperature sensor 13 and a first pressure sensor 14 electrically connected to the controller, and the input end of the compressor 10 is provided with a third temperature sensor 15 and a second pressure sensor 16 electrically connected to the controller. The exhaust temperature, exhaust pressure, suction temperature and suction pressure of the compressor 10 are monitored in real time by the second temperature sensor 13, the first pressure sensor 14, the third temperature sensor 15 and the second pressure sensor 16, and the data is transmitted to the controller. The controller judges whether the operating status of the compressor 10 is normal in combination with the preset safety threshold. If the compressor exhaust temperature is too high, the exhaust pressure is too high, the suction temperature is too low or the suction pressure is too low, the controller will issue a warning signal to remind the user to conduct timely inspection and maintenance. At the same time, if the operating status of the compressor 10 exceeds the safety range, for example, the exhaust temperature exceeds the maximum limit, the controller will issue a command to stop the operation of the compressor 10 to avoid overheating and damage to the compressor 10 and improve the reliability of the system.

[0028] In some embodiments, as Figure 1 As shown, the humidifier 100 is also included. The humidifier 100 is disposed within the air duct 30 and between the condenser 60 and the fan 70. The humidifier 100 can effectively increase indoor humidity, proactively alleviate the problem of dry indoor air, and provide users with a more comfortable indoor environment. In this embodiment, the humidifier 100 is a wet film humidifier. A wet film humidifier can evenly distribute water on the wet film surface, creating a large evaporation area, high humidification efficiency, and can quickly increase the humidity of the fresh air.

[0029] In a second aspect, embodiments of the present application provide a suspended ceiling structure equipped with the dual-cold-source fresh air system described in any embodiment of the first aspect. Those skilled in the art will clearly understand that, for ease and brevity of description, the specific operating process of the suspended ceiling structure described above can refer to the corresponding process in the aforementioned dual-cold-source fresh air system embodiment and will not be repeated here.

[0030] The dual-cooling-source fresh air system and ceiling structure designed in this utility model differ from the crude temperature and humidity control methods of dual-condensing dehumidification systems in related technologies. By adopting a dual-water outlet design and proportional valves, it achieves independent and precise control of the plate heat exchanger and coil heat exchanger. This refined control method gives the system more precise control over the supply air temperature and humidity, creating a more comfortable and pleasant indoor environment. Furthermore, the system also integrates a wet-film humidifier, enabling it to regulate indoor humidity, especially in dry winters. This can effectively increase indoor humidity, prevent the discomfort caused by excessively dry air, and further enhance the user experience.

[0031] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention 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. Therefore, they cannot be understood as limitations on the present invention.

[0032] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dual-cold-source fresh air system, comprising a compressor, a first heat exchanger, and an air duct, wherein a second heat exchanger, an evaporator, a condenser, and a fan are sequentially arranged in the air duct, wherein the output end of the compressor is connected to the first heat exchanger on one side and to the condenser on the other side; the output end of the condenser and the output end of the first heat exchanger are both connected to the input end of the evaporator, and the output end of the evaporator is connected to the input end of the compressor, characterized in that: It also includes a liquid inlet pipe, one end of which is used to connect to an external cooling water source, and the other end is connected to the water inlet end of the first heat exchanger and the water inlet end of the second heat exchanger through a water distribution pipe; the water outlet end of the first heat exchanger is connected to a first liquid outlet pipe, and the water outlet end of the second heat exchanger is connected to a second liquid outlet pipe, and a proportional valve is provided on the first liquid outlet pipe and the second liquid outlet pipe.

2. The dual-cooling source fresh air system according to claim 1, characterized in that: The first heat exchanger is a plate heat exchanger, and the second heat exchanger is a coil heat exchanger.

3. The dual-cooling source fresh air system according to claim 1, characterized in that: An air filter is provided on the air inlet side of the second heat exchanger.

4. The dual-cooling source fresh air system according to claim 1, characterized in that: It also includes a controller, and the air supply end of the air duct is provided with a first temperature sensor and a humidity sensor electrically connected to the controller; the output end of the compressor is connected to a three-way valve, one end of the three-way valve is connected to the first heat exchanger, and the other end is connected to the condenser through a solenoid valve; the output end of the first heat exchanger is connected to a first electronic expansion valve, and the output end of the condenser is connected to a second electronic expansion valve, and the output ends of the first electronic expansion valve and the second electronic expansion valve are connected in parallel to the input end of the evaporator; the solenoid valve, the first electronic expansion valve and the second electronic expansion valve are all electrically connected to the controller.

5. The dual-cooling source fresh air system according to claim 4, characterized in that: The output end of the compressor is provided with a second temperature sensor and a first pressure sensor electrically connected to the controller, and the input end of the compressor is provided with a third temperature sensor and a second pressure sensor electrically connected to the controller.

6. The dual-cooling source fresh air system according to any one of claims 1 to 5, characterized in that: The device also includes a humidifier, which is arranged in the air duct and located between the condenser and the fan.

7. The dual-cooling source fresh air system according to claim 6, characterized in that: The humidifier is a wet film humidifier.

8. A suspended ceiling structure, characterized in that: A dual-cold source fresh air system according to any one of claims 1 to 7.

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