Fresh air conditioning system

Abstract

The utility model discloses a fresh air conditioning system which comprises an air inlet section, a pre-heat exchange section, a unit heat exchange section, a re-heat exchange section, a humidity processing section and an air supply section which are sequentially arranged in the air inlet direction. The air return section, the temperature recovery section and the air exhaust section are sequentially arranged in the air exhaust direction, one end of the first heat pipe is arranged on the heat pre-exchange section and used for conducting auxiliary heat exchange on air needing to enter the unit heat exchange section, and the other end of the first heat pipe is arranged on the temperature recovery section close to the rear end recovery section of the air exhaust section; the first end of the second heat pipe is arranged on the re-heat-exchange section, the second end of the second heat pipe is arranged on the front end recovery section, close to the air return section, of the temperature recovery section, and the first end and the second end are connected through two sets of pipelines with valves to form a loop. Compared with a multi-stage heat exchanger, the multi-stage heat exchanger is lower in energy consumption, simpler in structure and easier to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of fresh air air conditioning systems, and in particular to a fresh air air conditioning system with low energy consumption and relatively constant temperature and humidity. Background Art

[0002] Traditional constant temperature and humidity air conditioning units usually use a multi-stage heat exchanger design to perform cooling and humidity control at different stages to meet the user's temperature and humidity requirements.

[0003] Constant temperature and humidity air conditioning systems are often used in specialized environments such as museums, archives, libraries, and laboratories. Due to the extremely stringent requirements for temperature and humidity control, especially in low-temperature and low-humidity environments, constant temperature and humidity air conditioning systems play a vital role. To maintain environmental stability, the air conditioning systems in these locations must be able to precisely control indoor temperature and humidity throughout the year, ensuring the long-term preservation and safety of collections, equipment, and documents.

[0004] In winter, temperatures are lower and the outside air typically contains lower humidity. Therefore, constant temperature and humidity units require additional electric heating devices to raise the air temperature while maintaining a stable relative humidity through humidity control technologies (such as humidifiers). Especially in the cold and dry winter, electric heating devices must not only provide temperature regulation but also maintain precise humidity control.

[0005] In summer, the unit usually needs to pre-cool the fresh air through a multi-stage evaporator and combine it with technologies such as condensation and dehumidification to achieve constant temperature and humidity control. Taking the refrigeration process of a constant temperature and humidity air-conditioning unit as an example, in order to meet certain temperature and humidity requirements, a multi-stage evaporator is used to gradually adjust the temperature and humidity in the air. In this process, the heat in the air is removed step by step, and the moisture is adjusted through condensation or evaporation.

[0006] Although the current constant temperature and humidity fresh air air conditioner can well regulate the indoor temperature and humidity, the unit uses a multi-stage heat exchanger and is equipped with electric heating and other devices, which has the following problems:

[0007] First, it leads to higher energy consumption of the entire fresh air air conditioning system;

[0008] Secondly, the multi-stage heat exchanger also makes the air conditioning pipeline structure more complicated, the system is not easy to adjust flexibly, and the control cost is increased. Correspondingly, the operation and maintenance costs are increased, and the failure rate of the system is increased.

[0009] Therefore, how to provide a fresh air air conditioning system with relatively low energy consumption has become a technical problem to be solved, so as to effectively improve the energy consumption problem of the unit and achieve low-energy operation during the actual operation of the unit. Utility Model Content

[0010] In order to solve the technical problem in the prior art that a fresh air air conditioning unit adopts a multi-stage evaporator to adjust the temperature, resulting in high energy consumption, the utility model proposes a fresh air air conditioning system.

[0011] The fresh air air conditioning system proposed in the present invention comprises: an air intake section, a preheat exchange section, a unit heat exchange section, a reheat exchange section, a humidity treatment section, and an air supply section arranged in sequence along the air intake direction; a return air section, a temperature recovery section, and an exhaust section arranged in sequence along the exhaust direction, and further comprises:

[0012] A first heat pipe, one end of which is arranged in the pre-heat exchange section for auxiliary heat exchange of the air that needs to enter the heat exchange section of the unit, and the other end is arranged in the rear end recovery section of the temperature recovery section close to the exhaust section;

[0013] The second heat pipe has a first end arranged in the reheat exchange section, and a second end arranged in the front recovery section of the temperature recovery section close to the return air section. The first end and the second end are connected by two groups of pipes with valves to form a loop.

[0014] Furthermore, the pipeline includes a first pipeline through which the refrigerant flows from the first end to the second end, and a second pipeline through which the refrigerant flows from the second end to the first end. The valve on the first pipeline is a first heat pipe valve with adjustable opening size, and the valve on the second pipeline is a second heat pipe valve with adjustable opening size.

[0015] Furthermore, the heat exchange section of the unit is provided with a heat exchange section temperature sensor for detecting the temperature of the air after heat exchange, and a heat exchange section humidity sensor for detecting the humidity of the air after heat exchange.

[0016] Furthermore, the control system of the fresh air air conditioning system controls the opening and closing of the first heat pipe valve and the second heat pipe valve according to the relationship between the temperature difference between the air temperature after heat exchange and the set temperature and the corresponding threshold value.

[0017] Furthermore, the front-end recovery section is provided with a spare return air valve, and the control system controls the spare return air valve according to the relationship between the set temperature and the temperature difference of the air after heat exchange detected by the heat exchange section temperature sensor and the corresponding threshold.

[0018] Furthermore, in cooling mode, when the control system determines that the temperature difference between the set temperature and the air temperature after heat exchange detected by the heat exchange section temperature sensor is greater than the maximum heat exchange temperature rise of the second heat pipe, the standby return air valve is opened.

[0019] Furthermore, in the cooling mode, when the control system determines that the temperature difference between the set temperature and the air temperature after heat exchange detected by the heat exchange section temperature sensor is less than or equal to the maximum heat exchange temperature rise of the second heat pipe and greater than or equal to the minimum heat exchange temperature rise of the second heat pipe, the standby return air valve is closed.

[0020] Furthermore, when the control system determines that the air humidity after heat exchange is less than the set humidity, the humidifier of the humidity processing section is turned on, otherwise the humidifier of the humidity processing section is turned off.

[0021] Furthermore, the humidifier is an electrode humidifier.

[0022] The utility model adopts a double heat pipe combined with a unit heat exchanger to replace the existing technology of using a multi-stage unit heat exchanger to achieve temperature regulation. Since the heat recovery of the heat pipe is mostly a liquid-absorbing core type heat pipe, there is no external drive and moving parts, and the internal heat pipe is an independent unit, maintenance is simple, which can effectively reduce the energy consumption of the fresh air air conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0024] Figure 1 It is a structural diagram of an embodiment of the present utility model.

[0025] Figure 2 This is the second heat pipe control flow chart of the present utility model.

[0026] Figure 3 This is a control flow chart of the spare return air valve of the utility model.

[0027] Description of reference numerals:

[0028] 1. Air inlet section; 2. Pre-heat exchange section; 3. Unit heat exchange section; 4. Reheat exchange section; 5. Humidity treatment section; 6. Air supply section; 7. Return air section; 8. Temperature recovery section; 9. Exhaust section.

[0029] 81. Front-end recycling section; 82. Back-end recycling section. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] Thus, a feature indicated in this specification is intended to illustrate one of the features of one embodiment of the present invention, rather than implying that every embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other, not explicitly described, combinations. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0032] As user needs change, the design of constant temperature and humidity air conditioning systems needs to develop in a more efficient, energy-saving, and intelligent direction. New constant temperature and humidity air conditioning systems need to operate with relatively low energy consumption not only in summer but also in winter.

[0033] Based on the above objectives, the fresh air air conditioning system of the present invention has the following structure: Figure 1 shown.

[0034] In the air inlet direction, the fresh air air conditioning system is equipped with an air inlet section 1, a pre-heat exchange section 2, a unit heat exchange section 3, a reheat exchange section 4, a humidity treatment section 5 and an air supply section 6. The outside air will pass through the above-mentioned treatment sections in sequence for temperature and humidity treatment, so as to deliver air that meets the temperature and humidity requirements to users in the air supply section.

[0035] In the exhaust direction, the fresh air air conditioning system is provided with a return air section 7, a temperature recovery section 8 and an exhaust section 9 in sequence. The temperature recovery section is further divided into a front-end recovery section 81 and a rear-end recovery section 82. The temperature recovery section is an energy-saving measure that effectively recovers the temperature of the return air to be discharged, and can reduce the energy consumption of the multi-stage heat exchanger used in the existing technology.

[0036] In addition to the aforementioned processing section, the present invention adds a first heat pipe and a second heat pipe. A heat pipe is a closed tubular device typically made of a metal material (such as copper, aluminum, or steel), with internal compartments divided into evaporation, transfer, and condensation zones. Its core principle is to efficiently transfer heat through the phase change (evaporation and condensation) of a working medium (usually a refrigerant) between the heating and cooling zones.

[0037] One end of the first heat pipe is located in the pre-heat exchange section, assisting in heat exchange with air entering the heat exchange section of the unit. The other end is located in the temperature recovery section, near the exhaust section. In other words, the two ends of the first heat pipe function as the evaporation end and the condensation end, respectively, depending on the season.

[0038] The second heat pipe also has two ends, the first end is arranged in the reheat exchange section, and the second end is arranged in the front recovery section of the temperature recovery section close to the return air section. The first end and the second end are connected by two groups of pipes with valves to form a loop. The first end and the second end of the second heat pipe also play the role of evaporation end and condensation end respectively in the corresponding season, but the structure of the second heat pipe is different from that of the first heat pipe. The second heat pipe has a regulating function, so the transmission area of ​​the second heat pipe is divided into two groups of pipes, each group of pipes contains one or more pipes. For the convenience of description, taking a pipe as an example, the condensation end to the evaporation end, or the evaporation end to the condensation end is controlled by the valves on the corresponding pipes, so the refrigerant can be controlled to flow to one end in full or partially, thereby playing a role in regulating the temperature.

[0039] Based on the above-mentioned technical solution, this utility model only incorporates a traditional heat exchanger within the unit's heat exchange section. Pre-cooling, preheating, and temperature readjustment are all performed via heat pipes, eliminating the need for a multi-stage heat exchanger. The heat pipes achieve efficient heat transfer through the evaporation and condensation of the working medium, thereby reducing the energy consumption of traditional multi-stage heat exchanger systems. Furthermore, the heat pipe design avoids the multi-stage heat exchangers and complex piping systems found in traditional air conditioning units, effectively reducing the number of internal pipes and installation space, simplifying design and construction.

[0040] In a specific embodiment, the pipeline of the second heat pipe includes a first pipeline through which the refrigerant flows from the first end to the second end, and a second pipeline through which the refrigerant flows from the second end to the first end. The valve on the first pipeline is a first heat pipe valve with adjustable opening size, and the valve on the second pipeline is a second heat pipe valve with adjustable opening size.

[0041] The second heat pipe regulates the refrigerant's flow direction and volume through the first and second heat pipe valves. In actual use, those skilled in the art can precisely control the ratio of refrigerant flowing through the first or second pipe based on temperature fluctuations, thereby adjusting the temperature difference between the evaporating and condensing ends of the second heat pipe. This allows the second heat pipe to adjust the outlet air temperature of the unit's heat exchange section to suit different seasons and temperature requirements.

[0042] In one embodiment, the heat exchange section of the unit is provided with a heat exchange section temperature sensor for detecting the temperature of the air after heat exchange, and a heat exchange section humidity sensor for detecting the humidity of the air after heat exchange. Furthermore, an air supply temperature sensor for detecting the air supply temperature can also be provided in the air supply section.

[0043] Temperature and humidity sensors are installed in the air supply section and the heat exchange section of the unit to monitor and control the temperature and humidity of the supply air in real time. Specifically, the air supply section is equipped with a supply air temperature sensor, while the heat exchange section of the unit is equipped with a heat exchange section temperature sensor and humidity sensor. These sensors monitor the system's operating status in real time, ensuring that the system can accurately adjust and control the air temperature and humidity, thereby optimizing system performance and user experience.

[0044] In one embodiment, the control system of the fresh air air conditioning system controls the opening and closing of the first heat pipe valve and the second heat pipe valve based on the temperature difference between the air temperature after heat exchange detected by the heat exchange section temperature sensor and the set temperature, and then based on the relationship between the temperature difference and the corresponding threshold.

[0045] Because the first end of the second heat pipe is located between the heat exchange section and the air supply section of the unit, the temperature difference between the temperature detected by the air supply temperature sensor and the set temperature can be compared with the corresponding threshold value, thereby controlling the opening and closing of the first and second heat pipe valves. Similarly, the temperature difference between the temperature detected by the heat exchange section temperature sensor and the set temperature can be compared with the corresponding threshold value to control the opening and closing of the first and second heat pipe valves. Furthermore, those skilled in the art can also control the opening size of the first and second heat pipe valves to achieve more precise control.

[0046] In one embodiment, when the unit is in cooling mode and shortly after startup, if the absolute difference between the air temperature after heat exchange in the unit's heat exchange section and the target temperature (i.e., the corresponding set temperature) is less than or equal to the temperature tolerance threshold (i.e., the corresponding threshold), the control system controls the first heat pipe valve to open to the maximum and the second heat pipe valve to close. At this point, the air temperature after heat exchange does not need to be adjusted, and the medium in the heat pipe will flow entirely to the front-end recovery section, achieving a constant temperature effect through simple valve control.

[0047] If, in cooling mode, the unit has just been started and the absolute difference between the air temperature after heat exchange and the target temperature (i.e., the set temperature) exceeds the temperature tolerance threshold (i.e., the corresponding threshold), the control system controls the first heat pipe valve to close and the second heat pipe valve to close. If the absolute difference between the air temperature after heat exchange and the target temperature (i.e., the set temperature) exceeds the temperature tolerance threshold, it indicates that the heat exchange capacity of the unit's evaporator is insufficient, and it is necessary to adjust the compressor speed, etc., to increase the heat exchange capacity of the evaporator in the unit's heat exchange section.

[0048] When the unit has undergone the adjustment of the first and second heat pipe valves and is no longer in the startup stage but has entered the stable operation stage, if the absolute value of the difference between the air temperature after heat exchange and the target temperature (i.e., the set temperature) after passing through the heat exchange section of the unit is less than or equal to the temperature tolerance threshold (i.e., the corresponding threshold), the control system controls the first heat pipe valve to open to the maximum and the second heat pipe valve to close. If the absolute value of the difference between the air temperature after heat exchange and the target temperature (i.e., the set temperature) after passing through the heat exchange section of the unit is greater than the temperature tolerance threshold (i.e., the corresponding threshold), the control system controls the first heat pipe valve to close and the second heat pipe valve to perform PID adjustment. The specific PID adjustment method is to adjust the opening size of the second heat pipe valve in stages according to the relationship between the absolute value of the difference between the air temperature after heat exchange and the target temperature (i.e., the set temperature) and the temperature tolerance threshold.

[0049] In the initial state, the first heat pipe valve and the second heat pipe valve are also in the closed state.

[0050] The first heat pipe utilizes the lower temperature of the exhaust return air to assist in adjusting the air temperature in the pre-heat exchange section. This allows the temperature of the fresh air to be pre-adjusted using the temperature of the external exhaust air, reducing the air conditioning unit's demand for external energy during temperature adjustment. In the exhaust section, the second heat pipe further recovers excess heat from the exhaust air through the temperature recovery section, improving the system's energy efficiency and reducing the burden on electrical heating or cooling equipment.

[0051] In one embodiment, the front-end recovery section of the present invention is equipped with a backup return air valve. The control system determines the difference between the set temperature and the post-heat exchange air temperature detected by the heat exchange section temperature sensor, determines the relationship with the corresponding threshold, and controls the backup return air valve. The backup return air valve controls the return air volume, thereby controlling the heat exchange at the second end of the second heat pipe, thereby regulating the heat exchange at the first end.

[0052] In one embodiment, in cooling mode, when the control system determines that the temperature difference between the set temperature and the post-heat exchange air temperature detected by the heat exchange section temperature sensor is greater than the maximum heat exchange temperature rise of the second heat pipe, the backup return air valve is opened. At this point, since the return air temperature is higher than the post-heat exchange air temperature, increased return air flow can be used to further adjust the refrigerant flow at the first end of the second heat pipe to regulate the supply air temperature.

[0053] In cooling mode, if the control system determines that the temperature difference between the set temperature and the air temperature after heat exchange, as detected by the heat exchange section temperature sensor, is less than or equal to the maximum heat exchange temperature rise of the second heat pipe and greater than or equal to the minimum heat exchange temperature rise of the second heat pipe, it closes the backup return air valve. This indicates that the temperature difference is within the adjustable range of the second heat pipe, so there is no need to open the backup return air valve.

[0054] In cooling mode, when the control system determines that the temperature difference between the set temperature and the air temperature after heat exchange detected by the heat exchange section temperature sensor is less than the minimum heat exchange temperature rise of the second heat pipe, the standby return air valve can perform PID adjustment based on the difference between the target temperature Tset (i.e., the set temperature) and the air temperature T2 after heat exchange.

[0055] While humidity control is not the primary focus of this invention, in one embodiment, it also incorporates humidity control into the humidity processing section. If the control system determines that the air humidity after heat exchange is lower than the set humidity, it turns on the humidifier in the humidity processing section; otherwise, it turns off the humidifier in the humidity processing section, ensuring that the air supply humidity meets user needs.

[0056] In one specific embodiment, the humidifier in the humidity treatment section uses an electrode humidifier to regulate the air humidity within the humidity treatment section. Electrode humidifiers use electrode oscillations to create tiny water droplets, which are then sprayed into the air, thereby increasing the indoor humidity and achieving a humidifying effect. Compared to traditional humidifiers, electrode humidifiers offer more efficient humidification, a simpler structure, and easier maintenance. Compared to wet-film humidifiers, electrode humidifiers are more efficient and energy-efficient.

[0057] The first and second heat pipes of the present invention can be either wick heat pipes or gravity heat pipes. These heat pipes require no external drive or moving parts, and can move the refrigerant through temperature differences. Wick heat pipes are the most effective, as gravity heat pipes offer relatively poor heat exchange and have more complex installation requirements, including location and space.

[0058] The following is a more specific example of a specific application of the present invention, which is temperature and humidity control in a specific application scenario of summer cooling.

[0059] When the fresh air air-conditioning system of the present invention is working, the fresh air entering in summer is high-temperature and high-humidity air. This part of the high-temperature and high-humidity air is pre-cooled by the first heat pipe and then enters the heat exchange section of the unit. In this specific embodiment, the heat exchange section of the unit adopts a direct expansion evaporation section, which is cooled and dehumidified again through the direct expansion evaporation section. Then, if necessary, the temperature is adjusted by the second heat pipe for heating and the electrode humidifier is used for humidification, and the air that meets the temperature and humidity requirements is finally sent into the room.

[0060] After the return air on the return air side, which has a lower indoor temperature, enters the fresh air air conditioning system, it first passes through the second end of the second heat pipe and then through the other end of the first heat pipe located in the rear recovery section. For the second heat pipe, the return air temperature at the second end of the return air side is higher than that at the first end of the fresh air side. Therefore, the gaseous medium exchanges heat with the cooler fresh air, condensing into a liquid state. The liquid medium then reaches the second end and exchanges heat with the warmer return air. For the first heat pipe, the return air temperature on the return air side is much lower than that of the incoming fresh air. The gaseous medium evaporating from the fresh air side exchanges heat with the cooler return air, condensing into a liquid state. The liquid medium then flows back through the wick, and the return air after the heat exchange is discharged through the exhaust fan.

[0061] When the user controls the spare return air valve and the first heat pipe valve and the second heat pipe valve, he can adopt the manual control mode according to the temperature detected by each temperature sensor. Of course, he can also adopt the automatic control mode, such as Figure 2 、 Figure 3 shown.

[0062] If it is automatic control mode, the default is mid-range.

[0063] At mid-range, assuming the user sets the target temperature as Tset, the first and second heat pipe valves remain closed in the initial stage. Five minutes after the fresh air air conditioning system is turned on, the post-heat exchange air temperature T2 and post-heat exchange air humidity Th2 are detected in real time. The post-heat exchange air temperature T2 is compared with the target temperature Tset. If |T2-X| ≤ Tset for t1 consecutive seconds (time t1 is adjustable), where X is the temperature tolerance, the first heat pipe valve is opened to its maximum value and the second heat pipe valve remains closed, allowing all the medium to flow into the second end of the second heat pipe. The moisture content d2 is calculated from the post-heat exchange air temperature T2 and the post-heat exchange air humidity Th2 (calculated based on the existing enthalpy-humidity diagram corresponding to temperature and humidity). If d2 ≥ the target humidity dset, the electrode humidifier is turned off; otherwise, it is turned on. At the same time, continue to detect the supply air temperature and humidity. If |T2-X|>Tset, close the first heat pipe valve and open the second heat pipe valve to adjust the medium flow direction, so that the medium flows into the reheat exchange section. According to the relationship between the air temperature T2 after heat exchange and the target temperature Tset, perform real-time PID adjustment of the opening.

[0064] Five minutes after the fresh air air conditioning unit is turned on, if |T2-X| > Tset for t1s (time t1 is configurable), the first and second heat pipe valves remain closed, and the electrode humidifier is turned off. Taking cooling as an example, if the air temperature T2 after heat exchange is too high, the unit needs to be controlled by adjusting the opening of the expansion valve, increasing the refrigerant flow to the evaporator, or increasing the speed of the outdoor unit fan to improve the outdoor unit's heat exchange efficiency. If the compressor is a variable-frequency compressor, the compressor speed can also be increased to increase cooling capacity and evaporator capacity. At this time, adjusting the second heat pipe has relatively little effect, so the first and second heat pipe valves remain closed. Simultaneously, the air temperature T2 and humidity Th2 after heat exchange are continuously monitored. If |T2-X| ≤ Tset, the first heat pipe valve is fully opened, and the second heat pipe valve remains closed, allowing all the heat pipe fluid to flow to the second end. The moisture content d2 is calculated. If d2 is less than the target humidity dset, the electrode humidifier is turned on. If |T2-X|>Tset, the unit is not in the initial startup stage, but the second heat pipe valve is closed and the first heat pipe valve is opened to the maximum. Therefore, the first heat pipe valve needs to be closed, and the second heat pipe valve performs real-time PID adjustment of the opening according to the relationship between the air temperature T2 after heat exchange and the target temperature Tset.

[0065] For the standby return air valve, if it is detected for t2 seconds continuously (time t2 can be set) that the target temperature Tset - the air temperature after heat exchange T2>M, where M is the maximum heat exchange temperature rise of the second heat pipe, the high speed is entered, and the standby return air valve is opened. The standby return air valve can also be further adjusted in its opening degree, specifically by performing PID adjustment based on the difference between the target temperature Tset and the air temperature after heat exchange T2. At the high speed, the control of the first heat pipe valve and the second heat pipe valve is the same as that at the mid-speed.

[0066] If it is detected for t2 consecutive seconds, such as 120 seconds, that the target temperature Tset - the air temperature after heat exchange T2 is less than N, where N is the minimum heat exchange temperature rise of the second heat pipe, the low gear is entered, and the current open and closed states of the first heat pipe valve and the second heat pipe valve are maintained. The standby return air valve can perform PID adjustment according to the difference between the target temperature Tset and the air temperature after heat exchange T2.

[0067] If N≤target temperature Tset - air temperature after heat exchange T2≤M is detected for t2 seconds continuously, the system will enter the middle gear. In the middle gear, the standby return air valve is closed.

[0068] The return air valve can be controlled and adjusted once every t0 seconds.

[0069] The above control solutions can be connected to BMS for remote setting and control.

[0070] This specific embodiment optimizes the control of the first and second heat pipe valves, achieving more efficient, precise, and stable temperature control. Its main advantages include improved energy efficiency, enhanced system adaptability, improved temperature and humidity control stability, enhanced intelligence, and extended equipment life. These advantages help reduce system energy consumption, improve user experience, and further enhance the economic and environmental friendliness of the air conditioning system.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fresh air air conditioning system, comprising: The air inlet section, pre-heat exchange section, unit heat exchange section, reheat exchange section, humidity treatment section and air supply section are arranged in sequence along the air inlet direction; The return air section, temperature recovery section and exhaust section are sequentially arranged along the exhaust direction, and are characterized by further comprising: A first heat pipe, one end of which is arranged in the pre-heat exchange section for auxiliary heat exchange of the air that needs to enter the heat exchange section of the unit, and the other end is arranged in the rear end recovery section of the temperature recovery section close to the exhaust section; The second heat pipe has a first end arranged in the reheat exchange section, and a second end arranged in the front recovery section of the temperature recovery section close to the return air section. The first end and the second end are connected by two groups of pipes with valves to form a loop.

2. The fresh air air conditioning system according to claim 1, characterized in that: The pipeline includes a first pipeline for the refrigerant to flow from the first end to the second end, and a second pipeline for the refrigerant to flow from the second end to the first end. The valve on the first pipeline is a first heat pipe valve with adjustable opening size, and the valve on the second pipeline is a second heat pipe valve with adjustable opening size.

3. The fresh air air conditioning system according to claim 2, characterized in that: The heat exchange section of the unit is provided with a heat exchange section temperature sensor for detecting the temperature of the air after heat exchange, and a heat exchange section humidity sensor for detecting the humidity of the air after heat exchange.

4. The fresh air air conditioning system according to claim 3, characterized in that: The control system of the fresh air air conditioning system controls the opening and closing of the first heat pipe valve and the second heat pipe valve according to the relationship between the temperature difference between the air temperature after heat exchange and the set temperature and the corresponding threshold value.

5. The fresh air air conditioning system according to claim 3, characterized in that: The front-end recovery section is provided with a spare return air valve, and the control system of the fresh air air conditioning system controls the spare return air valve according to the relationship between the set temperature and the temperature difference of the air temperature after heat exchange detected by the heat exchange section temperature sensor and the corresponding threshold.

6. The fresh air air conditioning system according to claim 5, characterized in that: In cooling mode, when the control system determines that the temperature difference between the set temperature and the air temperature after heat exchange detected by the heat exchange section temperature sensor is greater than the maximum heat exchange temperature rise of the second heat pipe, the standby return air valve is opened.

7. The fresh air air conditioning system according to claim 5, characterized in that: In cooling mode, when the control system determines that the temperature difference between the set temperature and the air temperature after heat exchange detected by the heat exchange section temperature sensor is less than or equal to the maximum heat exchange temperature rise of the second heat pipe and greater than or equal to the minimum heat exchange temperature rise of the second heat pipe, the standby return air valve is closed.

8. The fresh air air conditioning system according to any one of claims 1 to 7, characterized in that: When the control system of the fresh air air conditioning system determines that the air humidity after heat exchange is less than the set humidity, the humidifier of the humidity processing section is turned on, otherwise the humidifier of the humidity processing section is turned off.

9. The fresh air air conditioning system according to claim 8, characterized in that: The humidifier is an electrode humidifier.

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