New air purification air conditioning system for clean room low temperature and normal temperature switching

Abstract

The utility model provides a kind of for clean room low temperature and normal temperature switching brand new air purification air conditioning system, belong to air conditioning technical field.The system includes fresh air pipe, air pre-treatment system, low-temperature air handling unit, normal temperature air handling unit and air supply pipe, and exhaust fan unit;Fresh air pipe is used to introduce outdoor fresh air;Air pre-treatment system is used to carry out dehumidification and primary temperature control to introduced outdoor fresh air;Low-temperature air handling unit is used to carry out secondary cooling to the fresh air after pre-treatment;Normal temperature air handling unit is used to carry out secondary temperature control to the fresh air after pre-treatment;Air supply pipe is used to introduce the fresh air after low-temperature or normal temperature air handling unit processing into target space;Exhaust fan unit is used to filter after air in target space and is discharged to outdoor.The system can realize the efficient switching control of low-temperature and normal temperature environment by independently arranged low-temperature and normal temperature air handling unit, prevent condensation icing while meeting production requirement, improve system energy efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, specifically relating to a new air purification air conditioning system for switching between low and normal temperatures in clean rooms. Background Technology

[0002] Some critical functional production rooms for medical products require temperatures as low as -9℃±1℃. Due to the nature of these products, recirculated air cannot be used, necessitating a 100% fresh air conditioning system. Furthermore, production operations in these rooms are intermittent; when not in use, the rooms are rinsed and cleaned in preparation for the next production cycle. During this time, the room temperature is maintained at ambient temperature, such as 22℃±2℃. When the next production cycle begins, the room temperature is adjusted back to -9℃±1℃.

[0003] The following problems may arise when using existing air conditioning systems during the switching process between low-temperature and normal-temperature purification environments:

[0004] (1) When the room temperature changes from low to normal, the relative humidity decreases as the temperature rises. From -9℃ to 22℃, the relative humidity can reach below 10%, at which point the room is very dry and static electricity will be generated, which is detrimental to production. However, since users do not have requirements for humidity control, humidifying through the air conditioning system will result in energy waste.

[0005] (2) When cleaning is completed and the next production process is about to begin, the room temperature control is switched from normal temperature to low temperature. Under the same absolute humidity, the relative humidity increases as the temperature decreases. If the moisture content in the air is not properly handled, water may condense in the air ducts, air outlets, and rooms, and then freeze at low temperatures.

[0006] (3) Since it cannot utilize return air and is a completely fresh air system, it is greatly affected by outdoor meteorological parameters, resulting in increased energy consumption of the air conditioning system.

[0007] Therefore, there is an urgent need for an air conditioning system that can overcome at least one of the above defects. Utility Model Content

[0008] The purpose of this invention is to solve the problems existing in the prior art and provide a new air purification and air conditioning system for switching between low temperature and normal temperature in clean rooms. This system effectively solves the problems of high energy consumption and condensation in the room during temperature switching in existing air conditioning systems.

[0009] This utility model is achieved through the following technical solution:

[0010] The first aspect of the utility model provides a new air purification and air conditioning system for switching between low temperature and normal temperature in clean rooms, including a fresh air duct, an air pretreatment system, a low temperature air handling unit, a normal temperature air handling unit and an air supply duct, and an exhaust fan unit connected in sequence.

[0011] The fresh air duct is used to introduce outdoor fresh air into the air pretreatment system;

[0012] The air pretreatment system is used to pretreat the outdoor fresh air introduced by the fresh air duct through dehumidification and primary temperature adjustment.

[0013] The low-temperature air handling unit is used to perform secondary cooling on the pre-treated fresh air to meet the low-temperature requirements of the target space.

[0014] The ambient temperature air handling unit is used to perform secondary temperature adjustment on the pre-treated fresh air to meet the ambient temperature requirements of the target space.

[0015] The air supply duct is used to introduce fresh air, which has been processed by the low-temperature air handling unit or the normal-temperature air handling unit, into the target space.

[0016] The exhaust fan unit is used to filter the air in the target space and then discharge it outdoors.

[0017] Preferably, the air pretreatment system includes:

[0018] The system includes a front surface cooler and a rear surface cooler connected to the chilled water supply pipeline and the chilled water return pipeline, respectively; a first coarse filter and a first medium-efficiency filter for filtering fresh air; a first variable frequency blower for adapting to changes in filter resistance in the system; and a rotary dehumidifier for dehumidifying the fresh air to meet non-condensation requirements. The first coarse filter, the first medium-efficiency filter, the first variable frequency blower, and the rear surface cooler are connected in sequence.

[0019] Preferably, the rotary dehumidifier includes a regenerated air coarse filter, a regenerated air surface cooler connected to the chilled water supply pipeline and the chilled water return pipeline respectively, a regenerated air steam heater connected to the steam pipeline, a rotary wheel, and a regenerated air exhaust fan for providing power to the regenerated air. The regenerated air coarse filter, the regenerated air surface cooler, the regenerated air steam heater, the rotary wheel, and the regenerated air exhaust fan are connected in sequence.

[0020] Preferably, the exhaust fan unit includes: a fourth medium-efficiency filter and a high-efficiency filter for filtering air, and a first variable frequency exhaust fan for adapting to changes in filter resistance in the unit, wherein the fourth medium-efficiency filter, the high-efficiency filter and the first variable frequency exhaust fan are connected in sequence.

[0021] Preferably, the fresh air purification air conditioning system further includes a heat pipe heat recovery device for recovering the cold energy in the exhaust air;

[0022] The heat pipe heat recovery device includes a first heat pipe heat recovery unit and a second heat pipe heat recovery unit. The first heat pipe heat recovery unit is connected in series between the first medium-efficiency filter and the front surface cooler, and the second heat pipe heat recovery unit is connected in series between the high-efficiency filter and the first variable frequency exhaust fan. The first heat pipe heat recovery unit and the second heat pipe heat recovery unit are connected by a refrigerant pipe.

[0023] Preferably, the exhaust fan unit is connected to the target space via an exhaust duct;

[0024] A constant air volume valve is installed on the air supply pipe, and a variable air volume valve is installed on the exhaust pipe. The variable air volume valve is used to adjust the exhaust volume by means of a differential pressure sensor installed in the target space to control the pressure difference between the target space and the external space.

[0025] The air supply duct is located at the air outlet in the target space and is connected to the ground to prevent static electricity generation; the exhaust duct is located at the air outlet in the target space and is connected to the ground to prevent static electricity generation; the walls of the target space are connected to the ground to prevent static electricity generation.

[0026] Preferably, the low-temperature air handling unit includes: a first low-temperature surface cooler connected to the ethylene glycol chilled water supply pipeline and the ethylene glycol chilled water return pipeline respectively; a second variable frequency blower for adapting to changes in filter resistance in the system; and a second medium-efficiency filter for filtering fresh air, wherein the first low-temperature surface cooler, the second variable frequency blower, and the second medium-efficiency filter are connected in sequence.

[0027] Preferably, the target space requires a low temperature of -9±1℃, the ethylene glycol chilled water supply temperature is -20℃, and the ethylene glycol chilled water return temperature is -15℃.

[0028] Preferably, the ambient temperature air handling unit includes: a second surface cooler connected to the chilled water supply pipeline and the chilled water return pipeline respectively; a third variable frequency blower for adapting to changes in filter resistance in the system; a heater connected to the hot water supply pipeline and the hot water return pipeline respectively; and a third medium-efficiency filter for filtering fresh air. The second surface cooler, the third variable frequency blower, the heater, and the third medium-efficiency filter are connected in sequence.

[0029] Preferably, the target space requires a ambient temperature of 22±2℃, the chilled water supply temperature is 6℃, and the chilled water return temperature is 12℃.

[0030] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model proposes a new air purification and air conditioning system for switching between low temperature and normal temperature in clean rooms, including an air pretreatment system, a low temperature air handling unit and a normal temperature air handling unit, which can realize efficient switching control between low temperature and normal temperature environments, effectively prevent condensation and ice formation, improve system energy efficiency, and meet the requirements of switching the indoor temperature of clean rooms between low temperature and normal temperature. Attached Figure Description

[0031] The above and other objects, features, and advantages of this utility model will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this utility model and form part of the specification. They are used together with the embodiments of this utility model to explain the utility model and do not constitute a limitation thereof.

[0032] Figure 1 This is a structural schematic diagram of a fresh air purification air conditioning system for switching between low temperature and normal temperature in a clean room, according to an embodiment of the present utility model.

[0033] Figure 2 This is a schematic diagram of the air pretreatment system according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of a low-temperature air handling unit according to an embodiment of the present utility model;

[0035] Figure 4 This is a schematic diagram of the structure of a normal temperature air handling unit according to an embodiment of the present utility model;

[0036] Figure 5 This is a structural schematic diagram of an exhaust fan unit according to an embodiment of the present utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 110. Fresh air duct;

[0039] 120. Air pretreatment system; 121. First coarse filter; 122. First medium-efficiency filter; 123. Pre-cooler; 124. First variable frequency blower; 125. Post-cooler; 126. Rotor; 127. Regenerated air coarse filter; 128. Regenerated air cooler; 129. Regenerated air steam heater; 1201. First temperature sensor; 1261. Regenerated air exhaust fan; 1262. Bypass line; 1263. Bypass electric valve; 1264. Dew point temperature sensor.

[0040] 130. Low-temperature air handling unit; 131. First low-temperature surface cooler; 132. Second variable frequency blower; 133. Second medium-efficiency filter;

[0041] 140. Normal temperature air handling unit; 141. Second surface cooler; 142. Third variable frequency blower; 143. Heater; 144. Third medium efficiency filter;

[0042] 150. Supply air duct; 151. Exhaust air duct; 152a and 152b. Constant air volume valve; 153a and 153b. High efficiency filter air outlet; 154a and 154b. Variable air volume valve; 155a, 155b and 155c. Differential pressure sensor.

[0043] 160. Exhaust fan unit; 161. First variable frequency exhaust fan; 162. High efficiency filter; 163. Fourth medium efficiency filter;

[0044] 171. First heat pipe heat recovery unit; 172. Second heat pipe heat recovery unit; 173. Refrigerant pipe. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this utility model more apparent, exemplary embodiments according to this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this utility model, and not all of the embodiments of this utility model. It should be understood that this utility model is not limited to the exemplary embodiments described herein. Based on the embodiments of this utility model described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of this utility model.

[0046] To address the problems of high energy consumption and condensation in existing air conditioning systems during the switching between low-temperature and normal-temperature cleanroom environments, this invention proposes a novel air purification and air conditioning system for switching between low and normal temperatures in cleanrooms. This system reduces energy consumption while meeting environmental temperature and humidity requirements. The invention will be further described in detail below with reference to the accompanying drawings.

[0047] First, refer to Figure 1 This invention describes a novel air purification and air conditioning system for switching between low and normal temperatures in clean rooms, based on some embodiments of the present invention.

[0048] Figure 1 This is a structural schematic diagram of a fresh air purification air conditioning system for switching between low and normal temperatures in clean rooms, according to some embodiments of the present invention. Figure 1 As shown, the new air purification air conditioning system of this utility model includes a fresh air duct 110, an air pretreatment system 120, a low temperature air handling unit 130, a normal temperature air handling unit 140 and an air supply duct 150, and an exhaust fan unit 160 connected in sequence.

[0049] The fresh air duct 110 is used to introduce outdoor fresh air into the air pretreatment system 120;

[0050] The air pretreatment system 120 is used to pretreat the outdoor fresh air introduced by the fresh air duct 110 through dehumidification and primary temperature adjustment.

[0051] The low-temperature air handling unit 130 is used to perform secondary cooling on the pre-treated fresh air to meet the low-temperature requirements of the target space.

[0052] The ambient temperature air handling unit 140 is used to perform secondary temperature regulation on the pre-treated fresh air to meet the ambient temperature requirements of the target space.

[0053] The air supply duct 150 is used to introduce fresh air, which has been processed by the low-temperature air handling unit and the normal-temperature air handling unit, into the target space.

[0054] The exhaust fan unit 160 is used to filter the air in the target space and discharge it outdoors.

[0055] The air pretreatment system 120 refers to a device that reduces the humidity of the air through physical means. Specifically, it can be achieved by using a rotary dehumidifier combined with a surface cooler, ensuring that the absolute humidity is below the condensation threshold through two-stage dehumidification. The low-temperature air handling unit 130 refers to a temperature control device that uses a low-temperature refrigerant. Specifically, it can be a surface cooler structure with ethylene glycol solution circulation, achieving precise temperature control at -9℃ through an independent cold source. The ambient temperature air handling unit 140 refers to a device with bidirectional temperature regulation capability. Specifically, it can be a combination structure of a chilled water surface cooler (summer) and a hot water heater (winter) to achieve stable output under ambient temperature conditions (e.g., 22℃).

[0056] This invention proposes a novel air purification and air conditioning system for switching between low and normal temperatures in clean rooms. Through an air pretreatment system, a low-temperature air handling unit, and a normal-temperature air handling unit, it can achieve efficient switching control between low-temperature and normal-temperature environments, effectively prevent condensation and ice formation, improve system energy efficiency, and meet the requirements of clean room indoor temperature switching between low and normal temperatures.

[0057] Next, refer to Figure 2 This describes an air pretreatment system according to an embodiment of the present invention.

[0058] Figure 2 This is a schematic diagram of the air pretreatment system according to an embodiment of the present invention, as shown below. Figure 2As shown, the air pretreatment system includes: a first coarse filter 121, a first medium-efficiency filter 122, and a first heat pipe heat recovery unit 171 for filtering fresh air; a front surface cooler 123 and a rear surface cooler 125 connected to the chilled water supply and return pipelines, respectively; a first variable frequency fan 124 to adapt to changes in system resistance caused by changes in filter resistance; and a rotary dehumidifier to dehumidify the fresh air to meet non-condensation requirements. The first coarse filter 121, the first medium-efficiency filter 122, the front surface cooler 123, the first variable frequency fan 124, the rotary dehumidifier, and the rear surface cooler 125 are connected in sequence. A first temperature sensor 1201 is installed at the air outlet of the front surface cooler 123, and a second temperature sensor (not shown in the figure) is installed at the air outlet of the rear surface cooler 125. Electric regulating valves (not shown in the figure) are installed on the chilled water supply pipes and chilled water return pipes of the front surface cooler 123 and the rear surface cooler 125. The electric regulating valves are electrically connected to the corresponding temperature sensors.

[0059] The front surface cooler 123 and the rear surface cooler 125 are heat exchange devices that achieve gradient cooling of fresh air through chilled water circulation. Specifically, they can be implemented using copper tubes fitted with hydrophilic membranes and aluminum fins. The front surface cooler 123 pre-cools and initially dehumidifies the fresh air before it enters the rotary dehumidifier, enhancing the dehumidification capacity of the rotary dehumidifier. The rear surface cooler 125 cools the high-temperature, low-humidity air after it has passed through the rotary dehumidifier. The first coarse filter 121 is a primary filtration device that intercepts large particulate pollutants. Specifically, it can be implemented using G4-grade filter cotton, protecting downstream equipment from particulate clogging. The first medium-efficiency filter 122 is a secondary filtration device that filters medium-sized particles. Specifically, it can be implemented using an F7-grade bag filter, improving air cleanliness. The first variable frequency fan 124 is an air supply device that adjusts the motor speed to adapt to changes in system resistance and controls the airflow. Specifically, it can be implemented using an EC motor-driven centrifugal fan, dynamically adjusting the airflow according to operating conditions. Rotary dehumidifiers are dehumidification devices that utilize adsorption materials for periodic moisture absorption and regeneration. Specifically, they can be implemented using silica gel or molecular sieve rotary structures to deeply remove moisture from fresh air and prevent condensation.

[0060] For example, the rotary dehumidifier may include a rotary wheel 126, a regenerated air coarse filter 127, a regenerated air surface cooler 128 connected to a chilled water supply line and a chilled water return line respectively, a regenerated air steam heater 129 connected to a steam line, and a regenerated air exhaust fan 1261 for providing power to the regenerated air. The regenerated air coarse filter 127, the regenerated air surface cooler 128, the regenerated air steam heater 129, the rotary wheel 126, and the regenerated air exhaust fan 1261 are connected in sequence.

[0061] The regenerated air first passes through a coarse filter 127 to remove impurities, then enters a regenerated air surface cooler 128 to exchange heat with chilled water. The moisture content of the regenerated air is reduced to a preset range to increase regeneration capacity. The pretreated regenerated air then enters a steam heater 129, where it is heated by 0.6 MPa steam to form high-temperature, low-humidity regenerated air, enabling the rotor 126 to achieve higher efficiency during the regeneration process. This effectively avoids the problem of duct icing under low-temperature conditions during the switching of medical product manufacturing environments.

[0062] Preferably, a bypass pipe 1262 and a bypass electric valve 1263 are provided at the impeller 126, and a dew point temperature sensor 1264 is provided in the fresh air duct to determine whether the fresh air needs to undergo deep dehumidification treatment through the impeller 126 based on the state of the outdoor air. For example, when dehumidification is not required in winter, the bypass electric valve 1263 is opened, and outdoor fresh air flows through the bypass pipe 1262; when dehumidification is required in summer, the bypass electric valve 1263 is closed, and outdoor fresh air flows through the impeller 126.

[0063] When the bypass electric valve 1263 is closed, the outdoor fresh air undergoes two stages of filtration, passing through the first coarse filter 121 and the first medium-efficiency filter 122. It then recovers the cooling capacity from the exhaust side via the first heat pipe heat recovery unit 171 on the fresh air side before entering the pre-cooler 123 for initial cooling and dehumidification. Subsequently, the first variable frequency fan 124 adjusts the airflow in real time according to changes in filter resistance, ensuring treatment effectiveness while reducing energy consumption. The pre-cooled fresh air enters the rotary dehumidifier 126 for deep dehumidification via adsorption, ensuring the absolute humidity is below the saturation humidity required for subsequent low-temperature processing. The air then flows through the post-cooler 125 for secondary cooling of the high-temperature, low-humidity air from the rotary dehumidifier 126, further reducing its temperature.

[0064] Preferably, the fresh air purification air conditioning system also includes a heat pipe heat recovery device for recovering the cold energy in the exhaust air. The heat pipe heat recovery device is a device that uses the temperature difference between the exhaust air and the fresh air to transfer cold energy. Specifically, it can be implemented by using a heat exchange tube filled with a phase change working fluid, and heat transfer is achieved through the evaporation and condensation cycle of the working fluid.

[0065] The heat pipe heat recovery device may include a first heat pipe heat recovery unit 171 disposed on the fresh air side and a second heat pipe heat recovery unit disposed on the exhaust air side. Figure 2 (not shown in the image) Figure 2 The first heat pipe heat recovery unit 171 is connected in series between the first medium-efficiency filter 122 and the front surface cooler 123, so that the fresh air absorbs the cold energy in the exhaust air before entering the front surface cooler 123, thereby reducing the cooling load of the front surface cooler 123. The second heat pipe heat recovery unit is installed in the exhaust air path to recover the cold energy of the exhaust air.

[0066] Through the above technical solution, this application effectively reduces the risk of condensation on the surface cooler caused by fluctuations in outdoor fresh air humidity. The synergistic effect of gradient cooling and adsorption dehumidification ensures thorough treatment of non-condensable water. At the same time, the variable frequency fan can effectively adapt to changes in the filter resistance in the system and adjust the air volume to avoid energy waste.

[0067] Next, refer to Figure 3 This describes a low-temperature air handling unit according to an embodiment of the present invention.

[0068] like Figure 3 As shown, the low-temperature air handling unit includes: a first low-temperature surface cooler 131 connected to both the ethylene glycol chilled water supply line and the ethylene glycol chilled water return line; a second variable frequency blower 132 for adjusting the air supply volume; and a second medium-efficiency filter 133 for filtering fresh air. The first low-temperature surface cooler 131, the second variable frequency blower 132, and the second medium-efficiency filter 133 are connected in sequence.

[0069] The ethylene glycol chilled water supply and return pipelines refer to the circulating pipelines that transport ethylene glycol aqueous solution. Using ethylene glycol solution as a refrigerant prevents the pipelines from freezing under low-temperature conditions. The first low-temperature surface cooler 131 is a surface heat exchange device, specifically implemented using a copper tube with aluminum fins, achieving temperature regulation through heat exchange between the ethylene glycol solution and air. The second variable frequency blower 132 is a centrifugal fan equipped with a variable frequency speed control device, specifically driven by a permanent magnet synchronous motor. Adjusting the motor speed adapts to changes in system resistance, controlling the airflow. The second medium-efficiency filter 133 is an air filtration device with a filtration efficiency of F9, specifically implemented using a pleated glass fiber filter media structure, used to intercept particles larger than 1 micrometer. As the resistance of the second medium-efficiency filter 133 gradually increases with system operation, the second variable frequency blower 132 adapts to changes in filter resistance within the system, ensuring a stable airflow.

[0070] Specifically, the target space requires a low temperature of -9±1℃, the ethylene glycol chilled water supply temperature is -20℃, and the ethylene glycol chilled water return temperature is -15℃.

[0071] During operation, the ethylene glycol solution circulates within a temperature range of -20°C to -15°C, exchanging heat thoroughly with the pre-treated fresh air through the first low-temperature surface cooler 131, precisely lowering the air temperature to the target low-temperature range. The second variable frequency fan 132 automatically adjusts its speed based on feedback signals from the space differential pressure sensor. The second medium-efficiency filter 133 performs secondary filtration before the air flows through the surface cooler. The coordinated operation of these three components forms a closed-loop control system, simultaneously meeting the requirements for temperature accuracy, air cleanliness, and operational economy under 100% fresh air conditions.

[0072] Compared with existing technologies, traditional low-temperature air conditioning systems are prone to causing the surface cooler to freeze. However, in this unit, since the fresh air is fully dehumidified in the 126 rotor, it is only cooled in the first low-temperature surface cooler 131. The surface temperature of the surface cooler is higher than the dew point temperature of the air, and no condensate is generated, thus avoiding the risk of the surface cooler freezing and eliminating the need to consider defrosting.

[0073] Through the above technical solutions, this application solves the problems of inaccurate temperature control, equipment icing damage, and decreased air cleanliness in 100% fresh air systems under extreme low-temperature environments. The ethylene glycol circulation system ensures stable operation at -20℃, the variable frequency air supply achieves energy-saving effects through dynamic load matching, and the multi-stage filtration system ensures air purification requirements in low-temperature environments, thus constructing a reliable 100% fresh air temperature control and purification system under conditions without return air.

[0074] Next, refer to Figure 4 This describes an ambient temperature air handling unit according to an embodiment of the present invention.

[0075] Figure 4 This is a schematic diagram of the structure of a normal temperature air handling unit according to an embodiment of the present utility model; as shown. Figure 4 As shown, the ambient temperature air handling unit includes: a second surface cooler 141 connected to the chilled water supply line and the chilled water return line respectively; a third variable frequency blower 142 for adjusting the air supply volume; a heater 143 connected to the hot water supply line and the hot water return line respectively; and a third medium-efficiency filter 144 for filtering fresh air. The second surface cooler 141, the third variable frequency blower 142, the heater 143 and the third medium-efficiency filter 144 are connected in sequence.

[0076] The second surface cooler 141 is a heat exchange device that cools the air through chilled water circulation. Specifically, it can be implemented using a copper tube-clad aluminum finned heat exchanger. Connected to the chilled water supply and return lines, it cools the fresh air to meet the target room's ambient temperature requirements during temperature transitions. The heater 143 is a heat exchange device that heats the air through hot water circulation. It can also be implemented using a copper tube-clad aluminum finned heat exchanger. During winter, it heats the fresh air to meet the target room's temperature requirements during temperature transitions. The third medium-efficiency filter 144 is an air filtration device with an efficiency of F9. It can be implemented using a pleated glass fiber filter media structure to intercept particulate matter in the fresh air to maintain the cleanliness of the target space. As the resistance of the third medium-efficiency filter 144 gradually increases with system operation, the third variable frequency fan 142 adapts to changes in filter resistance within the system, ensuring a stable airflow.

[0077] Specifically, the target space requires a ambient temperature of 22±2℃, a chilled water supply temperature of 6℃, a chilled water return temperature of 12℃, a hot water supply temperature of 60℃, and a hot water return temperature of 50℃.

[0078] During operation, when the target space needs to switch from a low-temperature environment to a normal-temperature environment, outdoor fresh air is pre-treated before entering the normal-temperature air handling unit. If the unit operates in summer mode, the second surface cooler 141 cools the fresh air through chilled water circulation, lowering the air temperature to the required supply air temperature. If the unit operates in winter mode, the heater 143 heats the fresh air through hot water circulation, raising the air temperature to the required supply air temperature. The third variable frequency fan 142 automatically adjusts the air volume based on the feedback signal from the differential pressure sensor (not shown in the figure) on the main air supply duct, optimizing energy consumption while meeting environmental control requirements. The third medium-efficiency filter 144 continuously filters particulate pollutants in the fresh air, ensuring that the air supplied to the target space meets cleanliness requirements.

[0079] It should be noted that all ducts, air vents, and walls in the target room are grounded.

[0080] Through the above technical solution, this application effectively solves the problem of static electricity generated in the room due to excessively low relative humidity caused by temperature changes during the switching from ambient temperature to clean environment. Under the condition of a fresh air system operation, the synergistic effect of cooling / heating regulation and variable frequency air volume control achieves a balance and optimization of precise temperature control and energy consumption, while ensuring that the air cleanliness meets the requirements of the production process and avoiding secondary pollution from return air.

[0081] Next, refer to Figure 5 This describes the exhaust fan unit according to an embodiment of the present utility model.

[0082] Figure 5 This is a structural schematic diagram of the exhaust fan unit according to an embodiment of the present utility model, as shown below. Figure 5 As shown, the exhaust fan unit includes: a fourth medium-efficiency filter 163 for filtering air, a high-efficiency filter 162, a second heat pipe heat recovery unit 172, and a first variable frequency exhaust fan 161 to adapt to changes in filter resistance within the unit. The fourth medium-efficiency filter 163, the high-efficiency filter 162, and the first variable frequency exhaust fan 161 are connected sequentially along the airflow direction. The exhaust fan unit is connected to the target space via an exhaust duct 151, on which a differential pressure sensor 155c is installed. The differential pressure sensor 155c is electrically connected to the first variable frequency exhaust fan 161.

[0083] The fourth type, the medium-efficiency filter 163, refers to a filtration device with an air filtration efficiency of F7, which can be implemented using a bag filter or a plate filter. It is used to intercept particles larger than 1 micrometer in diameter, forming a primary filtration barrier. The high-efficiency filter 162 refers to a filtration device with an air filtration efficiency of H13, which can be implemented using a folded glass fiber filter paper structure. It is used to remove particles larger than 0.3 micrometers in diameter, forming a final filtration barrier to ensure that the air discharged outdoors meets environmental protection requirements. The first type, the variable frequency exhaust fan 161, refers to a centrifugal fan equipped with a variable frequency motor, whose speed can be changed by adjusting the motor frequency.

[0084] Through the above technical solution, this application effectively solves the risk of pollutant leakage in the room caused by insufficient exhaust air cleanliness, and at the same time uses a variable frequency fan to achieve dynamic matching between the exhaust volume and the exhaust system.

[0085] Please continue reading. Figure 5 The target space includes operating room 1 and operating room 2. Preferably, constant air volume valves 152a and 152b are installed on the air supply duct, and variable air volume valves 154a and 154b are installed on the exhaust duct. The variable air volume valves are used to adjust the exhaust volume to control the pressure difference between operating room 1 and operating room 2 and the external space by means of differential pressure sensors 155a and 155b installed in operating room 1 and operating room 2. The differential pressure sensor 155a and the variable air volume valve 154a are electrically connected, and the differential pressure sensor 155b and the variable air volume valve 154b are electrically connected.

[0086] Priority is given to the air supply duct located at the air outlet in the target space and connected to the ground, and the air exhaust duct located at the air outlet in the target space and also connected to the ground. The walls of the target space are also connected to the ground to prevent static electricity from being generated.

[0087] Grounding refers to protective measures that connect conductive components to the earth electrically. Specifically, it can be achieved by connecting copper wires to the building's grounding grid to eliminate static charges accumulated on the surface of metal components.

[0088] Please continue reading. Figure 5 In this embodiment, a non-powered second heat pipe heat recovery unit 172 is used to recover heat from the exhaust air, thereby effectively saving energy. The second heat pipe heat recovery unit 172 can be connected in series between the high-efficiency filter 162 and the first variable frequency exhaust fan 161, so that the exhaust air transfers its cooling capacity to the fresh air before being discharged, further reducing the consumption of cooling capacity. The first heat pipe heat recovery unit 171 and the second heat pipe heat recovery unit 172 are connected by a refrigerant pipe 173.

[0089] Specifically, after passing through the first medium-efficiency filter 122, the fresh air enters the first heat pipe heat recovery unit 171, where it exchanges heat with the exhaust air, absorbing the cooling capacity of the exhaust air and reducing the temperature of the fresh air entering the front surface cooler, thereby reducing the chilled water energy consumption required by the front surface cooler. After passing through the high-efficiency filter 162, the exhaust air enters the second heat pipe heat recovery unit 172, transferring the remaining cooling capacity to the fresh air side, further recovering the energy from the exhaust air. Through the two-stage heat pipe arrangement, cooling capacity exchange is achieved at the front and rear ends of the air handling unit, maximizing the utilization of the cooling capacity in the exhaust air, reducing the additional cooling demand caused by the inability to utilize return air in the 100% fresh air system, and reducing the cooling energy consumption of the 100% fresh air air conditioning system during the low-temperature processing stage.

[0090] Finally, it should be noted that the above technical solution is only one implementation of this utility model. For those skilled in the art, based on the application methods and principles disclosed in this utility model, it is easy to make various types of improvements or modifications, and not limited to the methods described in the above specific implementation of this utility model. Therefore, the methods described above are only preferred and do not have a limiting meaning.

Claims

1. A new type of air purification and air conditioning system for switching between low temperature and normal temperature in clean rooms, characterized in that: It includes a fresh air duct, an air pretreatment system, a low-temperature air handling unit, a normal-temperature air handling unit, and an air supply duct, all connected in sequence, as well as an exhaust fan unit; The fresh air duct is used to introduce outdoor fresh air into the air pretreatment system; The air pretreatment system is used to pretreat the outdoor fresh air introduced by the fresh air duct through dehumidification and primary temperature adjustment. The low-temperature air handling unit is used to perform secondary cooling on the pre-treated fresh air to meet the low-temperature requirements of the target space. The ambient temperature air handling unit is used to perform secondary temperature adjustment on the pre-treated fresh air to meet the ambient temperature requirements of the target space. The air supply duct is used to introduce fresh air, which has been processed by the low-temperature air handling unit or the normal-temperature air handling unit, into the target space. The exhaust fan unit is used to filter the air in the target space and then discharge it outdoors.

2. The fresh air purification air conditioning system for switching between low temperature and normal temperature in clean rooms according to claim 1, characterized in that: The air pretreatment system includes: The system includes a front surface cooler and a rear surface cooler connected to the chilled water supply pipeline and the chilled water return pipeline, respectively; a first coarse filter and a first medium-efficiency filter for filtering fresh air; a first variable frequency blower for adapting to changes in filter resistance in the system; and a rotary dehumidifier for dehumidifying the fresh air to meet non-condensation requirements; the first coarse filter, the first medium-efficiency filter, the front surface cooler, the first variable frequency blower, and the rear surface cooler are connected in sequence.

3. The fresh air purification air conditioning system for switching between low temperature and normal temperature in clean rooms according to claim 2, characterized in that: The rotary dehumidifier includes a regenerated air coarse filter, a regenerated air surface cooler connected to the chilled water supply pipeline and the chilled water return pipeline respectively, a regenerated air steam heater connected to the steam pipeline, a rotary wheel, and a regenerated air exhaust fan for providing power to the regenerated air; the regenerated air coarse filter, the regenerated air surface cooler, the regenerated air steam heater, the rotary wheel, and the regenerated air exhaust fan are connected in sequence.

4. The fresh air purification air conditioning system for switching between low temperature and normal temperature in clean rooms according to claim 2, characterized in that: The exhaust fan unit includes: a fourth medium-efficiency filter and a high-efficiency filter for filtering air, and a first variable frequency exhaust fan for adapting to changes in filter resistance within the unit; the fourth medium-efficiency filter, the high-efficiency filter, and the first variable frequency exhaust fan are connected in sequence.

5. The fresh air purification air conditioning system for switching between low temperature and normal temperature in clean rooms according to claim 4, characterized in that: The new air purification air conditioning system also includes a heat pipe heat recovery device for recovering the cold energy in the exhaust air. The heat pipe heat recovery device includes a first heat pipe heat recovery unit and a second heat pipe heat recovery unit. The first heat pipe heat recovery unit is connected in series between the first medium-efficiency filter and the front surface cooler, and the second heat pipe heat recovery unit is connected in series between the high-efficiency filter and the first variable frequency exhaust fan. The first heat pipe heat recovery unit and the second heat pipe heat recovery unit are connected by a refrigerant pipe.

6. The fresh air purification air conditioning system for switching between low temperature and normal temperature in clean rooms according to claim 4, characterized in that: The exhaust fan unit is connected to the target space via an exhaust duct; A constant air volume valve is installed on the air supply pipe, and a variable air volume valve is installed on the exhaust pipe. The variable air volume valve is used to adjust the exhaust volume by means of a differential pressure sensor installed in the target space to control the pressure difference between the target space and the external space. The air supply duct is located at the air outlet in the target space and is connected to the ground to prevent static electricity from being generated. The exhaust duct is located at the air outlet in the target space and is connected to the ground to prevent static electricity generation; the walls of the target space are also connected to the ground to prevent static electricity generation.

7. The fresh air purification air conditioning system for switching between low temperature and normal temperature in clean rooms according to claim 1, characterized in that: The low-temperature air handling unit includes: a first low-temperature surface cooler connected to the ethylene glycol chilled water supply pipeline and the ethylene glycol chilled water return pipeline respectively; a second variable frequency blower for adapting to changes in filter resistance in the system; and a second medium-efficiency filter for filtering fresh air; the first low-temperature surface cooler, the second variable frequency blower, and the second medium-efficiency filter are connected in sequence.

8. The fresh air purification air conditioning system for switching between low temperature and normal temperature in clean rooms according to claim 7, characterized in that: The target space requires a low temperature of -9±1℃, the ethylene glycol chilled water supply temperature is -20℃, and the ethylene glycol chilled water return temperature is -15℃.

9. The fresh air purification air conditioning system for switching between low temperature and normal temperature in clean rooms according to claim 1, characterized in that: The ambient temperature air handling unit includes: a second surface cooler connected to the chilled water supply pipeline and the chilled water return pipeline respectively; a third variable frequency blower for adapting to changes in filter resistance in the system; a heater connected to the hot water supply pipeline and the hot water return pipeline respectively; and a third medium-efficiency filter for filtering fresh air; the second surface cooler, the third variable frequency blower, the heater and the third medium-efficiency filter are connected in sequence.

10. The fresh air purification air conditioning system for switching between low temperature and normal temperature in clean rooms according to claim 9, characterized in that: The target space requires a ambient temperature of 22±2℃, a chilled water supply temperature of 6℃, and a chilled water return temperature of 12℃.

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