Heat recovery fresh air system

Abstract

The utility model relates to a new trend system technical field discloses a kind of heat recovery new trend systems, comprising: heat recovery unit, fixedly arranged in the preset position of building, including the air inlet channel and return air channel that can carry out heat transfer between each other, the air inlet channel is connected with central fan;Air supply duct, including air supply main pipe and several air supply branch pipes, one end of the air supply main pipe is connected on the air inlet channel, the air supply branch pipe is arranged in each floor air using area of building, one end of the air supply branch pipe is communicated with the air supply main pipe, and several air supply branch pipes are equipped with several air supply openings;Several new trend units are respectively arranged on the air supply branch pipe of each floor air using area;Air return duct, including return air main pipe and several return air branch pipes, one end of the return air main pipe is connected on the return air channel, and the return air branch pipe is arranged in each floor air using area.The heat recovery new trend system can reduce machine room area and reduce conveying energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of fresh air system technology, specifically to a heat recovery fresh air system. Background Technology

[0002] In frigid and cold regions, large-scale centralized fresh air systems of a certain size are required to be equipped with exhaust heat recovery devices, which can effectively reduce the fresh air load and thus reduce the energy consumption of the air conditioning system. When there is a significant temperature or enthalpy difference between outdoor and indoor air, exhaust heat recovery has a significant energy-saving effect. The energy savings are even more pronounced when the air conditioning system has a certain air volume.

[0003] Office buildings employ fan coil units with fresh air supply systems, widely used in office buildings with high requirements for comfort and air quality. Due to limited building area, heat recovery air conditioning units are located in equipment floors or rooftop air conditioning rooms, with one unit serving office areas on different floors within the building. When selecting heat recovery air conditioning units, to ensure sufficient fresh air supply to each floor, a relatively large external static pressure is set. In actual operation, this results in higher energy consumption for building equipment and a larger footprint. Utility Model Content

[0004] This utility model was made to solve the above-mentioned technical problems. One of its objectives is to provide a heat recovery fresh air system that can reduce the area of ​​the computer room and reduce the energy consumption of the transmission.

[0005] According to one embodiment of the present invention, a heat recovery fresh air system is provided, comprising: a heat recovery unit, fixedly installed at a predetermined location in a building, including an air inlet channel and a return air channel capable of heat transfer between them, wherein the air inlet channel is connected to a central fan; an air supply duct, including a main air supply pipe and a plurality of branch air supply pipes, one end of the main air supply pipe being connected to the air inlet channel, the branch air supply pipes being located in the air-use areas on each floor of the building, one end of the branch air supply pipes being connected to the main air supply pipe, and the branch air supply pipes being provided with a plurality of air outlets; a plurality of fresh air units, respectively installed on the branch air supply pipes in the air-use areas on each floor; and a return air duct, including a main return air pipe and a plurality of branch return air pipes, one end of the main return air pipe being connected to the return air channel, and the branch return air pipes being located in the air-use areas on each floor.

[0006] As one implementation, the air inlet channel and the air return channel are plate heat exchange structures or tubular heat exchange structures.

[0007] As one implementation, the heat recovery fresh air system further includes: a plurality of carbon dioxide sensors, installed in each floor's air-use area, for detecting the carbon dioxide concentration in the area; and a controller connected to the carbon dioxide sensors, the fresh air unit, and the heat recovery unit, wherein the controller is configured to start the fresh air unit in the air-use area or increase the power of the fresh air unit after the carbon dioxide concentration in the air-use area reaches a preset value.

[0008] As one implementation, the heat recovery fresh air system further includes: a pressure sensor located at the end 1 / 3 of the air supply main duct to detect the pressure inside the air supply main duct and connected to the controller; wherein the controller is further configured to increase the power of the central fan when the pressure in the air supply main duct is lower than a preset value.

[0009] As one implementation, the heat recovery unit is equipped with an electrically operated airtight valve.

[0010] In one implementation, the central fan is a variable frequency fan.

[0011] As one implementation, the heat recovery fresh air system further includes: a plurality of regulating valves, disposed on the air supply branch pipe, located upstream of the air outlet, for controlling the air volume of the air outlet.

[0012] In one implementation, the return air duct is connected to a central fan.

[0013] Based on the above description and practical application, the heat recovery fresh air system of this utility model includes a heat recovery unit. A central fan in this unit supplies fresh air to the air supply duct, and separate fresh air units are installed in each floor's air-use area to deliver fresh air from the main air supply duct to that area. Due to the coordinated operation of these units, the central fan of the heat recovery unit can be a relatively low-power model, resulting in a significantly smaller size compared to the central fan in traditional fresh air systems. Furthermore, since each floor's fresh air unit only handles the fresh air load of its designated area, their size is also relatively small. Compared to traditional fresh air systems that rely on a single high-power, large-sized central fan, the heat recovery fresh air system of this utility model significantly reduces the area required for the air conditioning room. Moreover, during operation, each unit can meet the fresh air needs of each floor with lower power consumption, thus reducing the overall energy consumption of the fresh air system. In addition, since most of the units operate at lower power, the unit air pressure is also maintained at a relatively low level, which makes it less likely to damage the air supply ducts, increases the service life of the air supply ducts and accessories, and reduces the air leakage of the system. Attached Figure Description

[0014] Figure 1This is a schematic diagram of a heat recovery fresh air system involved in one embodiment of the present invention.

[0015] The attached figures are labeled as follows:

[0016] 1. Heat recovery unit; 2. Main air supply duct; 3. Branch air supply duct; 4. Fresh air unit; 5. Main return air duct; 6. Branch return air duct; 7. Air outlet; 8. Carbon dioxide sensor; 9. Pressure sensor; 10. Regulating valve. Detailed Implementation

[0017] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0018] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] like Figure 1 As shown, in this embodiment, a heat recovery fresh air system is disclosed, which includes a heat recovery unit 1, a supply air duct, several fresh air units 4, and a return air duct.

[0021] The heat recovery unit 1 is fixedly installed at a predetermined location in the building, such as on the top floor, in the basement, or on the side. The heat recovery unit 1 includes an air inlet duct and a return air duct that allow heat transfer between them. The air inlet duct is connected to a central fan. Heat exchange occurs between the fresh air in the air inlet duct and the exhaust air in the return air duct, thereby achieving heat recovery. The internal structure of the heat recovery unit 1 is not shown in the attached drawings.

[0022] The air supply duct includes a main air supply pipe 2 and several branch air supply pipes 3. One end of the main air supply pipe 2 is connected to the air intake duct, and the other end extends into the building. The branch air supply pipes 3 are located in the air-use areas on each floor of the building. One end of each branch air supply pipe 3 is connected to the main air supply pipe 2, and each branch air supply pipe 3 is equipped with several air outlets 7. The air outlets 7 can be installed in various rooms or areas as needed to meet the ventilation requirements of different areas.

[0023] Several fresh air handling units 4 are installed on the air supply branch pipes 3 of each floor's air-use area. The fresh air handling units 4 can be independently controlled according to the actual needs of each floor's air-use area to provide an appropriate amount of fresh air.

[0024] The return air duct includes a main return air duct 5 and several branch return air ducts 6. One end of the main return air duct 5 is connected to the return air duct, and the other end extends into the building. The branch return air ducts 6 are located in the air-use areas on each floor and are used to collect the return air from each area and transport it to the return air duct through the main return air duct 5.

[0025] In this embodiment, the heat recovery fresh air system includes a heat recovery unit 1, whose central fan supplies fresh air to the air supply duct. Each floor's air-use area is equipped with a separate fresh air unit 4, which delivers fresh air from the main air supply duct 2 to its respective area. Due to the coordinated operation of the various fresh air units 4, the central fan of the heat recovery unit 1 can be a relatively low-power model, thus significantly reducing its size compared to the central fan in a traditional fresh air system. Furthermore, since each floor's fresh air unit 4 only handles the fresh air load of its designated area, its size is also relatively small. Compared to traditional fresh air systems that rely on a single high-power, large-sized central fan, the heat recovery fresh air system of this invention significantly reduces the area of ​​the air conditioning room. During operation, each unit can meet the fresh air requirements of each floor with lower power, reducing the system's energy consumption. Moreover, since most units operate at lower power, the unit air pressure remains relatively low, reducing the risk of damage to the air supply duct, increasing the service life of the duct and its accessories, and reducing system leakage. After the fresh air delivered to the air-using area stays indoors for a period of time, with the continuous input of fresh air, some of the indoor air will return to the heat recovery unit 1 through the return air duct, and exchange heat with the fresh air in the air intake duct. This can reduce the temperature difference in the air-using area and indirectly reduce the energy consumption of the air conditioning system in the building.

[0026] In one embodiment, the heat recovery unit 1 is located on the roof of the building. By placing the heat recovery unit 1 on the roof of the building and installing fresh air units 4 in the air-use areas on each floor, the operating energy consumption of the fresh air system is reduced. Since each fresh air unit 4 only needs to bear the fresh air load of the service area, the air volume is small and the unit size is also small, which reduces the machine room area of ​​the heat recovery unit 1 on each floor. Since the heat recovery unit 1 is mainly a heat recovery device, a rooftop equipment room may not be required.

[0027] In this embodiment, the air inlet and return air channels are tubular heat exchange structures. The tubular heat exchange structure consists of multiple metal tubes; some of these tubes serve as the air inlet channel for supplying incoming air, while others serve as the return air channel for supplying return air. The metal tubes have excellent thermal conductivity, effectively transferring heat from the return air to the incoming air, thus achieving heat recovery. The tubular heat exchange structure is simple in structure and easy to maintain, making it suitable for a wide range of fresh air systems.

[0028] The heat recovery fresh air system of this embodiment also includes several carbon dioxide sensors 8 and a controller (not shown in the accompanying drawings). The carbon dioxide sensors 8 are installed in the air-use areas on each floor to detect the carbon dioxide concentration in their respective areas. The controller is connected to the carbon dioxide sensors 8, the fresh air handling unit 4, and the heat recovery unit 1. The controller is configured to start the fresh air handling unit 4 or increase its power when the carbon dioxide concentration in the air-use area reaches a preset value. The preset value can be set according to the requirements of different locations; for example, it can be set to 1000 ppm in office areas and 800 ppm in densely populated conference rooms. The carbon dioxide sensors 8 and the controller can automatically control the operation of the heat recovery fresh air system, ensuring that users within the building are in a relatively comfortable air environment.

[0029] The heat recovery fresh air system in this embodiment also includes a pressure sensor 9. The pressure sensor 9 is located at the end 1 / 3 of the air supply main duct 2 to detect the pressure within the duct and is connected to the controller. The controller is also configured to increase the power of the central fan when the pressure in the air supply main duct 2 is lower than a preset value. The preset value can be set according to system design requirements, for example, it can be set to 50 Pa. When the pressure in the air supply main duct 2 is lower than 50 Pa, the controller automatically increases the power of the central fan to ensure that the system can provide sufficient airflow.

[0030] This embodiment achieves precise control of the air system by using carbon dioxide sensor 8 and pressure sensor 9, combined with the controller to control the fresh air unit 4 and heat recovery unit 1, making the system operation more efficient and convenient, reducing the air leakage of the air system, and ensuring the efficient operation of the air system.

[0031] In this embodiment, the heat recovery unit 1 is equipped with an electrically operated airtight valve. The electrically operated airtight valve can be opened or closed as needed to control the airflow in the intake and return air channels. When the heat recovery and fresh air functions are not required, the electrically operated airtight valve can be closed to avoid unnecessary energy loss.

[0032] In this embodiment, the central fan is a variable frequency fan. The variable frequency fan can adjust its speed according to actual needs, providing an appropriate air volume, thereby achieving energy saving. When the system requires a larger air volume, the variable frequency fan can increase its speed; when the system requires a smaller air volume, the variable frequency fan can reduce its speed to avoid energy waste.

[0033] In this embodiment, the heat recovery fresh air system also includes several regulating valves 10. The regulating valves 10 are located on the air supply branch pipe 3, upstream of the air outlet 7, and are used to control the airflow at the air outlet 7. The regulating valves 10 can be adjusted according to the ventilation needs of different areas to ensure that each area receives an adequate amount of fresh air.

[0034] In this embodiment, a central fan is connected to the return air duct. The central fan in the return air duct extracts return air from the building and delivers it to the heat recovery unit 1 for heat exchange. The central fan in the return air duct works in conjunction with the central fan in the intake air duct to ensure a balance between the system's intake and return air volumes. Alternatively, when rapid air replacement in the air-consuming area is required, the power of the central fan in the return air duct can be increased to accelerate air replacement in the air-consuming area.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A heat recovery fresh air system, characterized in that, include: The heat recovery unit is fixedly installed at a predetermined location in the building and includes an air inlet duct and a return air duct that can transfer heat between each other. The air inlet duct is connected to a central fan. The air supply duct includes a main air supply pipe and several branch air supply pipes. One end of the main air supply pipe is connected to the air intake channel. The branch air supply pipes are located in the air-use areas on each floor of the building. One end of each branch air supply pipe is connected to the main air supply pipe. Several air outlets are provided on the branch air supply pipes. Several fresh air handling units are respectively installed on the air supply branch pipes of each floor's air-use area; The return air duct includes a main return air duct and several branch return air ducts. One end of the main return air duct is connected to the return air channel, and the branch return air ducts are located in the air-use areas of each floor.

2. The heat recovery fresh air system as described in claim 1, characterized in that, The air inlet and return air channels are plate heat exchange structures or tubular heat exchange structures.

3. The heat recovery fresh air system as described in claim 1, characterized in that, Also includes: Several carbon dioxide sensors are installed in the ventilation areas on each floor to detect the carbon dioxide concentration in their respective areas; The controller is connected to the carbon dioxide sensor, the fresh air unit, and the heat recovery unit. The controller is set to start the fresh air unit in the air-consuming area or increase the power of the fresh air unit after the carbon dioxide concentration in the air-consuming area reaches a preset value.

4. The heat recovery fresh air system as described in claim 3, characterized in that, Also includes: A pressure sensor is installed at the end 1 / 3 of the air supply main pipe to detect the pressure inside the air supply main pipe and is connected to the controller. The controller is also configured to increase the power of the central fan when the pressure in the main air supply pipe is lower than a preset value.

5. The heat recovery fresh air system as described in claim 4, characterized in that, The heat recovery unit is equipped with an electric airtight valve.

6. The heat recovery fresh air system as described in claim 1, characterized in that, The central fan is a variable frequency fan.

7. The heat recovery fresh air system as described in claim 4, characterized in that, Also includes: Several regulating valves are installed on the air supply branch pipe, located upstream of the air outlet, to control the air volume of the air outlet.

8. The heat recovery fresh air system as described in claim 1, characterized in that, The return air duct is connected to a central fan.

Images