Energy-saving air handling unit

Abstract

The utility model provides an energy-saving air handling unit which comprises an air handling unit body, a phase change material wall and a solar heating system, and a heat recovery unit, a mixing box, a cooling coil, a heating coil and an air feeder are sequentially arranged in the air handling unit body in the air flowing direction. A phase-change material wall is arranged in an enclosure structure of an air conditioner area served by the air handling unit body, the phase-change material wall comprises a concrete layer and a phase-change material layer, and the phase-change material layer is closer to the indoor space relative to the concrete layer. The solar heating system comprises a solar heat collector, the circulating water output end of the solar heat collector is connected with the circulating water input end of a heating coil, the circulating water output end of the heating coil is connected with the circulating water input end of the solar heat collector, building energy consumption is remarkably reduced, and energy-saving operation of the air handling unit is achieved.

Description

Technical Field

[0001] This utility model relates to the field of building environmental control technology, and in particular to an energy-saving air handling unit. Background Technology

[0002] Statistics show that in many commercial and large public buildings, the energy consumption of air handling units accounts for as much as 30%-50% of the total building energy consumption. In some super high-rise buildings, this proportion may even exceed 50%, becoming the main part of the building's energy consumption.

[0003] Traditional air handling units (Air Handling Units) face significant challenges due to the substantial differences in temperature and humidity between indoor and outdoor air during actual operation. In summer, hot and humid outdoor air enters the unit and needs to be cooled and dehumidified by cooling coils to meet comfortable indoor temperature and humidity requirements. This process consumes a large amount of electricity to drive the refrigeration compressor and other equipment. In winter, cold outdoor air needs to be significantly heated by heating coils, again consuming a large amount of electricity. Especially during transitional seasons with large diurnal temperature differences, Air Handling Units need to frequently switch between cooling and heating modes, leading to a sharp increase in energy consumption. Under extreme climatic conditions, such as sustained heat waves in summer or severe cold weather in winter, the energy consumption of traditional Air Handling Units increases exponentially to maintain a stable indoor environment. This not only places a heavy economic burden on building operators but also puts enormous pressure on energy supply systems, contradicting the global advocacy of energy conservation, emission reduction, and sustainable development.

[0004] To address this challenge, various energy-saving technologies have been developed. Heat recovery technology, by installing air-to-air heat exchangers, such as plate heat exchangers or rotary heat exchangers, in air handling units, can recover energy from exhaust air for use in fresh air pretreatment, thereby reducing the energy consumption of fresh air treatment. Studies have shown that using efficient heat recovery technology can reduce fresh air energy consumption by 20%-40%. Phase change materials (PCMs) possess unique latent heat characteristics, absorbing or releasing large amounts of heat when the temperature changes, while maintaining a relatively constant temperature. Applying them to building or air conditioning systems can effectively mitigate indoor temperature fluctuations and reduce the load on the air conditioning system. For example, applying PCMs to air conditioning ducts can reduce surface temperature fluctuations and decrease heat and cold loss. Solar energy, as a clean and renewable energy source, can be combined with air handling units by using solar collectors to collect solar radiation energy and convert it into heat energy to preheat the air, further reducing system energy consumption. In areas with abundant solar resources, the energy-saving effect is particularly significant.

[0005] However, these energy-saving technologies still face numerous challenges in practical integration. The application of phase change materials (PCMs) in buildings is mostly concentrated within equipment or air ducts, with low integration with the building envelope. The building envelope is a crucial interface for heat exchange between indoors and outdoors, and its thermal performance significantly impacts indoor temperature stability; however, existing PCM applications have failed to fully exploit the energy-saving potential of the building envelope. Heat recovery and solar energy systems mostly operate independently, failing to fully leverage the complementary advantages of different technologies, resulting in overall energy savings far below expectations. Furthermore, the arrangement of PCMs within the building envelope, including the location of the PCM layer, is critical to energy efficiency, but current research in this area is insufficient, leading to still relatively high energy consumption for air handling units. Summary of the Invention

[0006] To address the problems existing in the prior art, this utility model innovatively proposes an energy-saving air handling unit. By integrating multiple energy-saving technologies such as phase change materials, heat recovery, and solar energy, it solves the problem of high energy consumption in existing air handling units, significantly reduces building energy consumption, meets the growing demand for energy conservation, and achieves energy-saving operation of the air handling unit.

[0007] The first aspect of this utility model provides an energy-saving air handling unit, including an air handling unit body, and further comprising: a phase change material wall and a solar heating system. Inside the air handling unit body, along the airflow direction, are sequentially arranged a heat recovery unit for recovering energy from exhaust air and pre-treating fresh air, a mixing box for mixing fresh air and return air, a cooling coil for cooling and dehumidifying the mixed air, a heating coil for heating the cooled air, and a blower for delivering the treated air into the indoor air-conditioned area. The air-conditioned area served by the air handling unit body has a phase change material wall, which includes a concrete layer and a phase change material layer, with the concrete layer on the outer layer and the phase change material layer on the inner layer. The solar heating system includes a solar collector, with the circulating water output end of the solar collector connected to the circulating water input end of the heating coil, and the circulating water output end of the heating coil connected to the circulating water input end of the solar collector.

[0008] Optionally, the air handling unit body also includes a filter for filtering the mixed air, the filter being disposed between the mixing chamber and the cooling coil.

[0009] Optionally, the phase change material layer is embedded inside the concrete layer.

[0010] Furthermore, the thickness of the phase change material layer (9) is 10%-20% of the total thickness of the phase change material wall (10).

[0011] Furthermore, the thickness of the phase change material layer is 11.4% of the total thickness of the phase change material wall.

[0012] Optionally, the circulating water inlet of the heating coil is equipped with a heating electric regulating valve for adjusting the circulating water flow rate from the solar collector, and the cold water inlet of the cooling coil is equipped with a cooling electric regulating valve for adjusting the cold water flow rate from the chiller unit in the refrigeration room.

[0013] Furthermore, it also includes a human-machine interaction terminal, which includes a controller. The control output terminal of the controller is communicatively connected to the control input terminals of the heating electric regulating valve and the cooling electric regulating valve, respectively.

[0014] Furthermore, it also includes a temperature sensor for acquiring current indoor temperature data, wherein the temperature data output segment of the temperature sensor is communicatively connected to the temperature data input terminal of the controller.

[0015] Optionally, the human-computer interaction terminal further includes a data input module for users to input temperature setting data, and the temperature setting data output terminal of the data input module is communicatively connected to the temperature setting data input terminal of the controller.

[0016] Optionally, the human-computer interaction terminal further includes a display module for displaying the current indoor temperature data, wherein the input terminal of the display module for the current indoor temperature data is communicatively connected to the output terminal of the controller for the current indoor temperature data.

[0017] The technical solution adopted in this utility model has the following technical effects:

[0018] To address the problems existing in the prior art, this utility model innovatively proposes an energy-saving air handling unit. By integrating multiple energy-saving technologies such as phase change materials, heat recovery, and solar energy, it solves the problem of high energy consumption in existing air handling units, significantly reduces building energy consumption, meets the growing demand for energy conservation, and achieves energy-saving operation of the air handling unit.

[0019] In this utility model, the outer layer of the phase change material wall is a concrete layer, and the inner layer is a phase change material layer embedded inside the concrete layer, closer to the indoor space. The phase change material of the phase change material layer is a paraffin-based phase change material. The thickness of the phase change material layer is 10%-20% (preferably 11.4%) of the total thickness of the phase change material wall. By limiting the position, material type, and thickness parameters of the phase change material layer, the phase change material wall can effectively absorb and release indoor heat, exchange heat well with the air in the indoor activity area, regulate the indoor temperature, reduce indoor temperature fluctuations, and achieve a good temperature regulation effect. Moreover, it can achieve a balance between energy saving and economy.

[0020] In this utility model's technical solution, the circulating water input end of the heating coil is equipped with a heating electric regulating valve for adjusting the circulating water flow rate from the solar collector, and the cold water input end of the cooling coil is equipped with a cooling electric regulating valve for adjusting the cold water flow rate from the chiller unit in the refrigeration room; the controller in the human-machine interface terminal can acquire the current indoor temperature data and the user-input temperature setting data, and can flexibly control the heating electric regulating valve and the cooling electric regulating valve according to the current indoor temperature data and the user-input temperature setting data, further reducing the overall energy consumption of the air handling unit.

[0021] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit the present invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the system structure of the energy-saving air handling unit in Embodiment 1 of this utility model.

[0024] Figure 2 This is a structural schematic diagram of the wall phase change material layer setting method in Embodiment 1 of this utility model;

[0025] Figure 3 This is a communication schematic diagram of the human-computer interaction terminal 13 in Embodiment 2 of the present utility model.

[0026] The components include: 1. Heat recovery unit, 2. Mixing box, 3. Cooling coil, 4. Heating coil, 5. Return air fan, 6. Supply air fan, 7. Air-conditioned area, 8. Concrete layer, 9. Phase change material layer, 10. Phase change material wall, 11. Heating electric regulating valve, 12. Cooling electric regulating valve, 13. Human-machine interface terminal, 14. Temperature sensor, 15. Solar collector, 16. Solar heating system, 17. Filter, 18. Air handling unit body, 131. Controller, 132. Data input module, 133. Display module. Detailed Implementation

[0027] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, reference numerals and / or letters may be repeated in different examples. This repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted to avoid unnecessarily limiting the present invention.

[0028] Example 1

[0029] like Figure 1 As shown, this utility model provides an energy-saving air handling unit, including an air handling unit body 18, and further including: a phase change material wall 10 and a solar heating system 16. Inside the air handling unit body 18, along the air flow direction, are arranged sequentially a heat recovery unit 1 for recovering energy from exhaust air and pre-treating fresh air, a mixing box 2 for mixing fresh air and return air, a cooling coil 3 for cooling and dehumidifying the mixed air, a heating coil 4 for heating the cooled air, and a unit for supplying the treated air into the room. The air supply fan 6 in the air-conditioned area; the enclosure structure of the air-conditioned area served by the air handling unit is provided with a phase change material wall 10, the phase change material wall 10 includes a concrete layer 8 and a phase change material layer 9, the phase change material wall 10 includes an outer concrete layer 8 and an inner phase change material layer 9; the solar heating system 16 includes a solar collector 15, the circulating water output end of the solar collector 15 is connected to the circulating water input end of the heating coil 4, and the circulating water output end of the heating coil 4 is connected to the circulating water input end of the solar collector 15.

[0030] Preferably, the air handling unit body 18 also includes a filter 17 for filtering the mixed air, and the filter 17 is disposed between the mixing chamber 2 and the cooling coil 3.

[0031] The air handling unit body 18 adopts a conventional air handling unit frame structure. Inside, along the airflow direction, the following components are arranged sequentially: a heat recovery unit 1 (using a rotary heat exchanger) is located at the inlet of the air handling unit body 18, used to recover energy from the exhaust air, preheat the fresh air entering the mixing chamber 2, and pre-treat the fresh air; the mixing chamber 2 is connected to the outlet of the heat recovery unit 1, used to mix the fresh air and return air; a filter 17 is located after the mixing chamber, used to filter the mixed air; a cooling coil 3 and a heating coil 4 are arranged sequentially after the filter 17. The cooling coil 3 uses a chilled water coil, used to cool and dehumidify the mixed air; the heating coil 4 uses a hot water coil, used to heat the cooled air to reach the set supply air temperature; and a centrifugal fan 6 is located after the heating coil 4, used to deliver the treated air into the indoor air-conditioned area.

[0032] Specifically, the heat recovery unit 1 can be an air-to-air heat exchanger, preferably a rotary heat exchanger, to achieve efficient heat recovery for recovering energy from exhaust air and pre-treating fresh air; the mixing box 2 is used to mix fresh air and return air; the cooling coil 3 is used to cool and dehumidify the mixed air; the heating coil 4 is used to heat the cooled air to reach the set supply air temperature; the supply fan 6 is used to deliver the treated air into the indoor air-conditioned area; the return air fan 5 is mainly installed inside the indoor ceiling, which draws in indoor air, treats it, and then returns it to the room to achieve air circulation and renewal, providing fresh air.

[0033] Cooling coil 3 and heating coil 4 are installed in the air handling unit body 18. Air needs to exchange heat when it flows through these two places. The filtered air passes through cooling coil 3 and heating coil 4 in sequence. The main advantage of this structure compared to the existing structure is that the hot water for heating coil 4 is provided by solar collector 15. Furthermore, by combining the solar heating system 16 and the air handling unit body 18, the room temperature regulation effect is better.

[0034] The air handling unit body 18 achieves heat exchange by allowing air to flow through the cooling coil 3 and heating coil 4 at a certain speed, thereby cooling or heating the air. The filtered air flows evenly to the cooling coil 3 and heating coil 4 at a certain flow rate, efficiently cooling or heating the filtered air to meet different air conditioning needs.

[0035] The solar heating system 16 includes a solar collector 15 (which can be a vacuum tube-flat plate composite solar collector). The solar collector 15 can be installed on the south-facing roof of a building to maximize the collection of solar radiation energy. Circulating water, heated by the solar collector 15, enters the heating coil 4 to heat the cooled air to the supply air temperature. This process fully utilizes solar energy, eliminating the need for electric heating to reheat the cooled air, thus further achieving energy savings.

[0036] like Figure 2 As shown, the phase change material wall 10 is applied to the exterior and interior walls of the air-conditioned area as part of the building envelope of the air-conditioned area, which is the enclosure structure of the air-conditioned area served by the air handling unit 18. The outer layer of the phase change material wall 10 is a concrete layer 8, and the inner layer is a phase change material layer 9. The phase change material layer 9 is embedded inside the concrete layer 8, closer to the indoor space. The phase change material of the phase change material layer 9 is a paraffin-based phase change material. The paraffin-based phase change material has a melting temperature range of 27.5℃ to 29℃, which can effectively absorb and release indoor heat, and exchange heat well with the air in the indoor activity area, regulate the indoor temperature, reduce indoor temperature fluctuations, and achieve a better temperature regulation effect. Embedding the phase change material layer 9 within the building envelope of the air-conditioned area, preventing it from being exposed to the indoor space, can protect the phase change material from being affected by the external environment, thus avoiding performance degradation or damage. It can also prevent the phase change material layer 9 from causing pollution or other adverse effects on the indoor environment, and can also allow the phase change material layer 9 to better integrate with the building envelope of the air-conditioned area, improving the overall thermal performance and stability.

[0037] The thickness of the phase change material layer 9 is 10%-20% of the total thickness of the phase change material wall (10), which can achieve a balance between energy saving and economy. Furthermore, when the thickness of the phase change material layer 9 is 11.4% of the total thickness of the phase change material wall (10), the best balance between energy saving and economy can be achieved. The thickness range of the phase change material layer 9 is based on considerations of both energy saving and economy. Through the latent heat absorption / release capacity of the phase change material, the indoor temperature fluctuation can be effectively reduced, and the cooling and heating load demand of the air handling unit can be reduced (reducing heating time in winter and cooling frequency in summer), thus achieving a certain energy saving effect. The cost of phase change material (such as paraffin-based) increases linearly with the increase of thickness. When the thickness is too thin, the temperature regulation capacity is insufficient, and when it is too thick, the marginal benefit decreases. The optimal balance point (11.4%) between the two needs to be obtained through critical thickness analysis.

[0038] Working process: During the winter heating season, outdoor fresh air first enters the heat recovery unit 1, where it exchanges heat with the exhaust air to achieve preheating. The preheated fresh air then enters the mixing box 2 to mix with the return air. The mixed air is filtered through filter 17, and then cooled and dehumidified by the cooling coil 3. Next, it is finely heated by the heating coil 4 to reach the set supply air temperature, and finally delivered into the room by the blower 5. The phase change material wall 10 regulates the indoor temperature. As the indoor air is heated, the indoor temperature gradually increases, and the phase change material absorbs heat and melts, regulating the indoor temperature to a comfortable level. When the weather is cold, the air handling unit 18 heats the room more slowly, resulting in a lower indoor temperature. At this time, the phase change material condenses and releases heat, regulating the temperature to a comfortable level, thereby reducing indoor temperature fluctuations, reducing the operating time of the heating coil 4, and lowering the energy consumption of the air handling unit.

[0039] During the summer cooling season, outdoor fresh air first enters the heat recovery unit 1, where it exchanges heat with the exhaust air for pre-cooling. The pre-cooled fresh air then enters the mixing box 2 and mixes with the return air. The mixed air is filtered through filter 17 and then directly enters the cooling coil 3 for cooling and dehumidification. After reaching the set supply air temperature, it is delivered into the room by the blower 5. If necessary, the heating coil 4 after the cooling coil 3 can reheat and control the supply air humidity. The phase change material wall 10 regulates the indoor temperature. Before the air-conditioned room is cooled, the room temperature is high, and the phase change material is in a molten state. As the air conditioning unit cools the room, the room temperature gradually decreases until it falls below the human comfort temperature, reaching the freezing point of the phase change material. The phase change material releases heat to balance the indoor temperature, ensuring its stability and minimizing fluctuations. As the indoor temperature balances, it rises, and the phase change material absorbs heat to lower the temperature to the human comfort temperature, thus mitigating temperature fluctuations, reducing the operating time of the cooling coil 3, and lowering the energy consumption of the air handling unit.

[0040] It should be noted that the working process provided in this embodiment is only a description of one possible implementation process of the energy-saving air handling unit in Embodiment 1. It is only an exemplary illustration and cannot limit the protection scope of the energy-saving air handling unit. Those skilled in the art can also make other possible implementation processes based on the energy-saving air handling unit in this embodiment. This utility model does not impose any limitations here.

[0041] To address the problems existing in the prior art, this utility model innovatively proposes an energy-saving air handling unit. By integrating multiple energy-saving technologies such as phase change materials, heat recovery, and solar energy, it solves the problem of high energy consumption in existing air handling units, significantly reduces building energy consumption, meets the growing demand for energy conservation, and achieves energy-saving operation of the air handling unit.

[0042] In this utility model, the outer layer of the phase change material wall is a concrete layer, and the inner layer is a phase change material layer embedded inside the concrete layer, closer to the indoor space. The phase change material of the phase change material layer is a paraffin-based phase change material. The thickness of the phase change material layer is 10%-20% (preferably 15.4%) of the total thickness of the phase change material wall. By limiting the position, material type, and thickness parameters of the phase change material layer, the phase change material wall can effectively absorb and release indoor heat, exchange heat well with the air in the indoor activity area, regulate the indoor temperature, reduce indoor temperature fluctuations, and achieve a good temperature regulation effect. Moreover, it can achieve a balance between energy saving and economy.

[0043] Example 2

[0044] like Figure 1 As shown, the present invention also provides an energy-saving air handling unit. Unlike embodiment one, in this embodiment, the energy-saving air handling unit has a heating electric regulating valve 11 at the circulating water input end of the heating coil 4 for regulating the circulating water flow from the solar collector 15, and a cooling electric regulating valve 12 at the cold water input end of the cooling coil 3 for regulating the cold water flow from the chiller unit in the refrigeration room.

[0045] Preferably, such as Figure 1 and Figure 3 As shown, an energy-saving air handling unit in this embodiment also includes a human-machine interface terminal 13, which integrates a controller 131 (e.g., a microcontroller STM32F1). The control output terminal of the controller 131 is communicatively connected to the control input terminals of the heating electric regulating valve 11 and the cooling electric regulating valve 12, respectively.

[0046] Preferably, such as Figure 1 and Figure 3 As shown, an energy-saving air handling unit in this embodiment also includes a temperature sensor 14 (which may be installed on an indoor wall) for acquiring current indoor temperature data. The temperature data output segment of the temperature sensor 14 is communicatively connected to the temperature data input terminal of the controller 131.

[0047] Preferably, the human-computer interaction terminal 13 further includes a data input module 132 (e.g., function keys, numeric keys, etc.) for users to input temperature setting data, and the temperature setting data output terminal of the data input module 132 is communicatively connected to the temperature setting data input terminal of the controller 131.

[0048] Preferably, the human-computer interaction terminal 13 further includes a display module 133 for displaying the current indoor temperature data, and the input terminal of the display module 133 for displaying the current indoor temperature data is communicatively connected to the output terminal of the controller 131 for displaying the current indoor temperature data.

[0049] Working process: During the winter heating season, outdoor fresh air first enters the heat recovery unit 1, where it exchanges heat with the exhaust air to achieve preheating. The preheated fresh air then enters the mixing box 2 to mix with the return air. The mixed air is filtered through filter 17, and then cooled and dehumidified by the cooling coil 3. Next, it is finely heated by the heating coil 4 to reach the set supply air temperature, and finally delivered into the room by the blower 5. The phase change material wall 10 regulates the indoor temperature. As the indoor air is heated, the indoor temperature gradually increases, and the phase change material absorbs heat and melts, regulating the indoor temperature to a comfortable level for the human body. When the weather is cold, the air handling unit heats the room more slowly, resulting in a lower temperature in the air-conditioned room. At this time, the phase change material condenses and releases heat, regulating the temperature to a comfortable level for the human body, thereby reducing indoor temperature fluctuations and reducing the operating time of the heating coil 4. The controller 131 is integrated into the human-machine interface terminal 13. The controller 131 can adjust the opening or closing of the heating electric regulating valve 11 according to temperature data. For example, when the temperature sensor 14 detects that the indoor temperature is higher than the set 20°C (set by the user through the data input module 132), the controller 131 controls the heating electric regulating valve 11 to reduce its opening (or close the heating electric regulating valve 11; if the temperature continues to rise, the circulation pump of the solar heating system 16 will be turned off). When the temperature sensor 14 detects that the indoor temperature is lower than the set 18°C, the controller controls the heating electric regulating valve 11 to increase its opening (or open the heating electric regulating valve 11) to ensure a sufficient supply of hot water from solar heating to meet the heating demand. At the same time, the cooling electric regulating valve 12 is closed to stop the supply of chilled water, wherein the chilled water for the cooling coil comes from the chiller unit in the refrigeration room.

[0050] During the summer cooling season, outdoor fresh air first enters the heat recovery unit 1, where it exchanges heat with the exhaust air for pre-cooling. The pre-cooled fresh air then enters the mixing box 2 and mixes with the return air. The mixed air is filtered through filter 17 and then directly enters the cooling coil 3 for cooling and dehumidification. After reaching the set supply air temperature, it is delivered into the room by the blower 5. If necessary, the heating coil 4 after the cooling coil 3 can reheat and control the supply air humidity. The phase change material wall 10 regulates the indoor temperature. Before the air-conditioned room is cooled, the room temperature is high, and the phase change material is in a molten state. As the air conditioning unit cools the room, the room temperature gradually decreases until it falls below the human comfort temperature, reaching the freezing point of the phase change material. The phase change material releases heat to balance the indoor temperature, ensuring its stability and minimizing fluctuations. As the indoor temperature balances, it rises, and the phase change material absorbs heat to lower the temperature to the human comfort temperature, thus mitigating temperature fluctuations and reducing the operating time of the cooling coil 3. The controller 131 is integrated into the human-machine interface terminal 13. The controller 131 can adjust the opening or switch of the cooling electric regulating valve 12 according to temperature data. When the temperature sensor 14 detects that the indoor temperature is lower than the set 26℃ (set by the user through the data input module 132), the controller 131 controls the opening of the cooling electric regulating valve 12 to decrease (or closes the heating electric regulating valve 11) and increases the opening of the heating electric regulating valve 11. When the temperature sensor 14 detects that the indoor temperature is higher than the set 26℃, the controller 131 controls the opening of the cooling electric regulating valve 12 to increase (or opens the cooling electric regulating valve 12) and decreases the opening of the heating electric regulating valve 11. The indoor temperature is controlled by controlling the cooperation of the two valves and the temperature regulation of the indoor phase change material.

[0051] During the spring and autumn transition seasons, when the temperature is moderate, controller 131 can close the cooling electric regulating valve 12 and the heating electric regulating valve 11, relying solely on the heat recovery unit 1 and the phase change material wall 10 to regulate the air temperature, reducing energy consumption. If the temperature fluctuates significantly, the outdoor fresh air still first enters the heat recovery unit 1 to exchange heat with the exhaust air. The heat-exchanged fresh air then enters the mixing box 2 to mix with the return air. The mixed air is then filtered by filter 17 and directly enters the cooling coil 3 for cooling and dehumidification. It then passes through the heating coil 4 to heat the air, bringing it to the set supply air temperature. Once the set supply air temperature is reached, it is delivered into the room by the blower 5. The phase change material wall 10 releases heat when the indoor temperature decreases, mitigating indoor temperature fluctuations. The controller 131 is integrated into the human-machine interface terminal 13. It compares the indoor temperature monitored by the temperature sensor 14 with the set indoor temperature of 26°C. When the indoor temperature is higher than the set temperature (e.g., 26°C), the cooling electric regulating valve 12 and the heating electric regulating valve 11 are opened (or the opening of the cooling electric regulating valve 12 and the heating electric regulating valve 11 is increased), and the opening of the cooling electric regulating valve 12 is larger than the opening of the heating electric regulating valve 11. When the indoor temperature is lower than the set temperature (e.g., 26°C), the cooling electric regulating valve 12 and the heating electric regulating valve 11 are closed (or the opening of the cooling electric regulating valve 12 and the heating electric regulating valve 11 is decreased). By controlling the cooperation of the two valves and the temperature regulation of the indoor phase change material, the indoor temperature is controlled, and the indoor temperature is controlled during the transition season, thereby improving energy efficiency.

[0052] It should be noted that the working process provided in this embodiment for winter, summer, and spring and autumn transition seasons is only a description of one possible implementation process of the energy-saving air handling unit in Embodiment 1. It is only an exemplary illustration and cannot limit the protection scope of the energy-saving air handling unit. Those skilled in the art can also make other possible implementation processes based on the energy-saving air handling unit in this embodiment. This utility model does not impose any limitations here.

[0053] In this utility model's technical solution, the circulating water input end of the heating coil is equipped with a heating electric regulating valve for adjusting the circulating water flow rate from the solar collector, and the cold water input end of the cooling coil is equipped with a cooling electric regulating valve for adjusting the cold water flow rate from the chiller unit in the refrigeration room; the controller in the human-machine interface terminal can acquire the current indoor temperature data and the user-input temperature setting data, and can flexibly control the heating electric regulating valve and the cooling electric regulating valve according to the current indoor temperature data and the user-input temperature setting data, further reducing the overall energy consumption of the air handling unit.

[0054] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. An energy-saving air handling unit, comprising an air handling unit body (18), characterized in that, It also includes: a phase change material wall (10) and a solar heating system (16). Inside the air handling unit body (18), along the air flow direction, there are sequentially arranged a heat recovery unit (1) for recovering energy from exhaust air and pre-treating fresh air, a mixing box (2) for mixing fresh air and return air, a cooling coil (3) for cooling and dehumidifying the mixed air, a heating coil (4) for heating the cooled air, and a blower (6) for sending the treated air into the indoor air-conditioned area. The air-conditioned area served by the air handling unit is provided with a phase change material wall (10), which includes an outer concrete layer (8) and an inner phase change material layer (9); the solar heating system (16) includes a solar collector (15), the circulating water output end of the solar collector (15) is connected to the circulating water input end of the heating coil (4), and the circulating water output end of the heating coil (4) is connected to the circulating water input end of the solar collector (15).

2. The energy-saving air handling unit according to claim 1, characterized in that, The air handling unit body (18) also includes a filter (17) for filtering the mixed air, the filter (17) being disposed between the mixing chamber (2) and the cooling coil (3).

3. The energy-saving air handling unit according to claim 1, characterized in that, The phase change material layer (9) is embedded inside the concrete layer (8).

4. The energy-saving air handling unit according to claim 3, characterized in that, The thickness of the phase change material layer (9) is 10%-20% of the total thickness of the phase change material wall (10).

5. An energy-saving air handling unit according to claim 4, characterized in that, The thickness of the phase change material layer (9) is 11.4% of the total thickness of the phase change material wall (10).

6. An energy-saving air handling unit according to claim 1, characterized in that, The heating coil (4) is equipped with a heating electric regulating valve (11) at the circulating water input end for regulating the flow rate of circulating water from the solar collector (15), and the cooling coil (3) is equipped with a cooling electric regulating valve (12) at the cold water input end for regulating the flow rate of cold water from the chiller unit in the refrigeration room.

7. An energy-saving air handling unit according to claim 6, characterized in that, It also includes a human-computer interaction terminal (13), which includes a controller (131). The control output terminal of the controller (131) is communicatively connected to the control input terminals of the heating electric regulating valve (11) and the cooling electric regulating valve (12).

8. An energy-saving air handling unit according to claim 7, characterized in that, It also includes a temperature sensor (14) for acquiring current indoor temperature data, wherein the temperature data output segment of the temperature sensor (14) is communicatively connected to the temperature data input terminal of the controller (131).

9. An energy-saving air handling unit according to claim 7, characterized in that, The human-computer interaction terminal (13) also includes a data input module (132) for users to input temperature setting data. The temperature setting data output terminal of the data input module (132) is communicatively connected to the temperature setting data input terminal of the controller (131).

10. An energy-saving air handling unit according to claim 8, characterized in that, The human-computer interaction terminal (13) also includes a display module (133) for displaying the current indoor temperature data. The current indoor temperature data input terminal of the display module (133) is communicatively connected to the current indoor temperature data output terminal of the controller (131).

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