Combined central air conditioning high-efficiency fresh air heating system

Abstract

The utility model relates to the technical field of combined central air-conditioning energy-saving equipment, and discloses a combined central air-conditioning high-efficiency fresh air heating system, including a fresh air heating subsystem, the fresh air heating subsystem including a shell, a return air section, a mixed air section and an air supply section are sequentially arranged in the shell, the mixed air section is connected to the fresh air section, and also includes a waste heat recovery subsystem, a heat exchanger is arranged in the fresh air section, and the heat exchanger is used to perform heat exchange on the heat of the waste heat recovery subsystem to preheat the fresh air in the fresh air section. The utility model solves the problem of low overall energy utilization rate of power equipment in power workshops in the prior art, and utilizes the waste heat generated by the operation of the workshop air compressor unit to preheat the fresh air through a heat exchanger to reduce the energy consumption of heating the fresh air.

Description

Technical Field

[0001] The utility model relates to the technical field of combined central air-conditioning energy-saving equipment, in particular to a combined central air-conditioning high-efficiency fresh air heating system. Background Art

[0002] In the process of cigarette production, it is particularly important to ensure the environmental temperature and humidity. The power workshop of the cigarette factory is mainly responsible for providing the production site environment with temperature and humidity that meet the process requirements. According to the scale of the cigarette factory, the power workshop generally has about 20 to 50 combined central air-conditioning units, and its air-conditioning units are basically in operation throughout the year. According to relevant statistics, the energy consumption of central air-conditioning in cigarette factories accounts for about 40% of the total energy consumption of enterprises, and the energy-saving potential is huge. With the continuous improvement of the country's requirements for energy conservation and consumption reduction, the energy-saving research of combined central air-conditioning has also become a major trend.

[0003] Among them, the combined central air conditioner still needs to open the fresh air as the wind source for heating in at least 8 months except summer, so the fresh air is turned on for the longest time. In this case, the subsequent heating stage of the combined central air conditioner needs to consume a lot of heat energy to heat the fresh air. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a combined central air-conditioning high-efficiency fresh air heating system to solve the problem of low overall energy utilization rate of power equipment in the power workshop in the prior art, and to utilize the waste heat generated by the operation of the workshop air compressor unit to preheat the fresh air through a heat exchanger to reduce the energy consumption of fresh air heating.

[0005] The utility model solves the above technical problems through the following technical means: a combined central air-conditioning high-efficiency fresh air heating system, including a fresh air heating subsystem, the fresh air heating subsystem includes a shell, in which a return air section, a mixed air section and a supply air section are arranged in sequence, the mixed air section is connected to the fresh air section, and also includes a waste heat recovery subsystem, the fresh air section is provided with a heat exchanger, the heat exchanger is used to perform heat exchange on the heat of the waste heat recovery subsystem to preheat the fresh air in the fresh air section.

[0006] Furthermore, the heat exchanger is a fin heat exchanger with a vortex generator.

[0007] Furthermore, the fin heat exchanger includes a heat exchange tube and a plurality of continuous fins parallel to each other. The heat exchange tube includes a main body, a liquid inlet and a liquid outlet respectively passing through the shell. The main body of the heat exchange tube is in the shape of a parallel serpentine tube. The continuous fin is provided with a plurality of fin openings for the heat exchange tube main body to pass through. At least two vortex generators are symmetrically arranged on both sides below the fin opening of each continuous fin.

[0008] Furthermore, the waste heat recovery subsystem includes a plate heat exchanger, which is provided with a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet. The hot fluid inlet is used to connect to the high-temperature cooling water of the external air compressor unit, the hot fluid outlet is connected to the liquid inlet of the fin heat exchanger, the cold fluid inlet is connected to the liquid outlet of the fin heat exchanger, and the cold fluid outlet is used to connect to the low-temperature cooling water of the external air compressor unit.

[0009] Furthermore, a pressure pump is provided between the hot fluid inlet and the air compressor unit to provide power for the hot fluid to flow.

[0010] Furthermore, an insulation water tank and an electric regulating valve are arranged in sequence between the hot fluid outlet and the liquid inlet of the fin heat exchanger. The insulation water tank is used to buffer the hot fluid and adjust the flow entering the fin heat exchanger through the electric regulating valve.

[0011] Furthermore, a water collecting tank and a centrifugal pump are arranged in sequence between the liquid outlet of the fin heat exchanger and the cold fluid inlet. The water collecting tank is used to temporarily store the cold fluid, and the centrifugal pump provides flow pressure to return to the plate heat exchanger.

[0012] Furthermore, a temperature sensor is provided in the housing of the fresh air section to monitor whether the preheated fresh air meets the demand.

[0013] Beneficial effects of the utility model:

[0014] 1. The utility model utilizes the waste heat of the existing air compressor unit to preheat the fresh air from a lower temperature, which can reduce the energy consumption during the subsequent heating of the mixed air and achieve energy saving. Specifically, through the combination of a plate heat exchanger and a fin heat exchanger with a vortex generator, the plate heat exchanger is used to collect the waste heat of the air compressor unit, and the circulating water of the fin heat exchanger is heated by heat exchange, and the fin heat exchanger is used to preheat the fresh air. On the one hand, the waste heat of the power equipment is used well to improve the overall energy utilization rate of the power equipment in the power workshop. On the other hand, the heat exchange efficiency is higher than that of conventional fin heat exchangers.

[0015] 2. The utility model adjusts the heat source flow of the fin heat exchanger by setting an electric regulating valve to achieve the adjustment of the fresh air preheating temperature. By setting an insulating water tank and a water collecting tank, the system redundancy capacity of the heating system is improved to ensure the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a top view of the fin heat exchanger of the utility model;

[0018] Figure 3 yes Figure 2 Cross-sectional view along the AA direction.

[0019] Among them, 1-shell, 11-return air section, 12-mixing air section, 13-supply air section, 14-fresh air section, 141-temperature sensor, 2-fin heat exchanger, 21-heat exchange tube, 211-main body, 212-liquid inlet, 213-liquid outlet, 22-continuous fin, 221-fin opening, 222-vortex generator, 3-plate heat exchanger, 4-pressure pump, 5-insulated water tank, 6-electric regulating valve, 7-water collecting tank, 8-centrifugal pump, 9-air compressor unit. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are only for exemplary descriptions, and they are only schematic diagrams, not physical diagrams, and cannot be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the figures may be omitted.

[0021] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the figures, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] like Figure 1-Figure 3 As shown in FIG. 1 , a high-efficiency fresh air heating system for a combined central air conditioner of the utility model is shown. Figure 1 As shown, it includes a fresh air heating subsystem and a waste heat recovery subsystem. The fresh air heating subsystem includes a shell 1, in which a return air section 11, a mixing air section 12 and an air supply section 13 are arranged in sequence. The mixing air section 12 is connected to a fresh air section 14. It also includes a waste heat recovery subsystem. A heat exchanger and a temperature sensor 141 are arranged in the fresh air section 14. The heat exchanger is used to exchange heat of the waste heat recovery subsystem to preheat the fresh air in the fresh air section 14. The temperature sensor 141 is used to monitor whether the preheated fresh air meets the demand.

[0023] In this embodiment, the heat exchanger is a fin heat exchanger 2 with a vortex generator 222, specifically, as Figure 2As shown, the fin heat exchanger 2 includes a heat exchange tube 21 and a plurality of mutually parallel continuous fins 22. The continuous fins 22 are directly welded to the shell 1 and can play a fixing role. Figure 3 As shown, the heat exchange tube 21 includes a main body 211, a liquid inlet 212 and a liquid outlet 213 respectively passing through the shell 1. The main body 211 of the heat exchange tube 21 is in a parallel serpentine tube shape, which is collected by two collecting pipes, and then the liquid inlet 212 and the liquid outlet 213 are respectively opened on the two collecting pipes; a plurality of fin openings 221 for the main body 211 of the heat exchange tube 21 to pass through are opened on the continuous fin 22, and two vortex flow control devices are symmetrically arranged on both sides below the fin opening 221 of each continuous fin 22. The generator 222 makes four vortex generators 222 on the leeward side of each heat exchange tube passing through the fin opening 221 on both sides of the fin. The vortex generators 222 are symmetrically arranged on both sides of the continuous fin 22 and are located below the fin opening 221 of each continuous fin 22. The vortex generators 222 suppress the separation of air on the leeward side of the heat exchange tube body, reduce the area of ​​the wake region, and improve the heat transfer performance on the leeward side, thereby improving the overall heat exchange performance of the fin heat exchanger.

[0024] The waste heat recovery subsystem includes a plate heat exchanger 3, which is provided with a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet. The hot fluid inlet is used to connect to the high-temperature cooling water of the external air compressor unit 9, the hot fluid outlet is connected to the liquid inlet 212 of the fin heat exchanger 2, the cold fluid inlet is connected to the liquid outlet 213 of the fin heat exchanger 2, and the cold fluid outlet is used to connect to the low-temperature cooling water of the external air compressor unit 9. A pressure pump 4 is provided between the hot fluid inlet and the air compressor unit 9. The pressure pump 4 is a high temperature resistant centrifugal pump, which is used to provide power for the hot fluid (i.e., high temperature cooling water) to flow. An insulation water tank 5 and an electric regulating valve 6 are provided in sequence between the hot fluid outlet and the liquid inlet 212 of the fin heat exchanger 2. The insulation water tank 5 is made of stainless steel and is used to cache the hot fluid (i.e., high temperature circulating water). The flow of the high temperature circulating water entering the fin heat exchanger 2 is adjusted through the electric regulating valve 6. The high temperature circulating water enters the fin heat exchanger 2 and exchanges heat with the outside fresh air to become low temperature circulating water. At the same time, the outside fresh air is preheated. A water collecting tank 7 and a centrifugal pump 8 are provided in sequence between the liquid outlet 213 of the fin heat exchanger 2 and the cold fluid inlet. The water collecting tank 7 is used to temporarily store the low temperature circulating water discharged from the liquid outlet 213, and provides flow pressure through the centrifugal pump 8, and returns to the plate heat exchanger 3 to exchange heat again as high temperature circulating water. By providing the insulation water tank 5 and the water collecting tank 7, the system redundancy capacity of the heating system is improved and the reliability of the system is guaranteed.

[0025] It can be understood that the existing combined central air conditioner also has many parts that are not involved in the present utility model, such as the control system, the temperature sensor 141 of the fresh air section 14 detects the preheated fresh air temperature and transmits the detection data to the controller of the control system. The controller adjusts the electric regulating valve 6 by adjusting the actuator of the control system, and then adjusts the hot water flow of the heat exchanger to achieve the adjustment of the fresh air preheating temperature; for example, an existing filtering device, a refrigeration device, a heating device, a humidifying device and corresponding sensors are also provided between the mixing section and the air supply section in the shell 1, which are used to process the fresh air after mixing with the return air to meet the process requirements of the workshop.

[0026] The working principle of the utility model is as follows:

[0027] When the combined central air conditioner is running, when the fresh air mode is turned on, the fin heat exchanger 2 with the vortex generator 222 in the fresh air section 14 starts to work to preheat the fresh air from the outside. When the fresh air from the outside flows through the vortex generator 222, vortices will be generated, so that the boundary layer of the fresh air fluid is destroyed, thereby achieving the effect of enhanced heat exchange; the temperature sensor 141 of the fresh air section 14 detects the temperature of the preheated fresh air, and transmits the detection data to the controller of the control system. The controller adjusts the actuator of the control system, that is, adjusts the electric regulating valve 6, and then adjusts the heat source flow of the fin heat exchanger 2 to achieve the adjustment of the fresh air preheating temperature. The heated fresh air is subsequently mixed with the return air, and then enters each production workshop after subsequent processing.

[0028] In this process, the heat source of the fin heat exchanger 2 is mainly the waste heat generated by the air compressor unit 9, that is, the high-temperature cooling water of the air compressor unit 9 is heat exchanged through the plate heat exchanger 3, and the low-temperature circulating water is converted into high-temperature circulating water and sent to the insulated water tank 5. The water enters the fin heat exchanger 2 with the vortex generator 222 through the electric regulating valve 6 to exchange heat with the fresh air. The normal temperature circulating water after heat exchange flows back to the water collecting tank 7, and after being pressurized by the centrifugal pump 8, it enters the plate heat exchanger 3 to be heat exchanged again into high-temperature circulating water, and the cycle continues.

[0029] The utility model utilizes the high-temperature cooling water generated by the waste heat of the air compressor unit 9 and the fin heat exchanger 2 with a vortex generator 222. On the one hand, it makes good use of the waste heat of the power equipment (the air compressor unit in this embodiment) to improve the overall energy utilization rate of the power equipment in the power workshop. On the other hand, it has a higher heat exchange efficiency than conventional fin heat exchangers. By recycling the existing waste heat of the air compressor unit 9 to preheat the fresh air at a lower temperature, the energy consumption during the subsequent heating of the mixed air can be reduced, thereby achieving energy-saving effects.

[0030] The above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model. The technology, shape, and structure that are not described in detail in the utility model are all well-known technologies.

Claims

1. A combined central air conditioning high-efficiency fresh air heating system, comprising a fresh air heating subsystem, the fresh air heating subsystem comprising a housing (1), wherein a return air section (11), an air mixing section (12) and an air supply section (13) are sequentially arranged in the housing (1), the air mixing section (12) being connected to a fresh air section (14), characterized in that: It also includes a waste heat recovery subsystem, and a heat exchanger is provided in the fresh air section (14). The heat exchanger is used to perform heat exchange on the waste heat recovery subsystem to preheat the fresh air in the fresh air section (14).

2. The combined central air-conditioning high-efficiency fresh air heating system according to claim 1 is characterized in that: The heat exchanger is a fin heat exchanger (2) with a vortex generator (222).

3. The combined central air-conditioning high-efficiency fresh air heating system according to claim 2 is characterized in that: The fin heat exchanger (2) comprises a heat exchange tube (21) and a plurality of mutually parallel continuous fins (22); the heat exchange tube (21) comprises a main body (211), a liquid inlet (212) and a liquid outlet (213) respectively passing through a shell (1); the main body (211) of the heat exchange tube (21) is in the shape of a parallel serpentine tube; the continuous fin (22) is provided with a plurality of fin openings (221) for the main body (211) of the heat exchange tube (21) to pass through; and at least two vortex generators (222) are symmetrically arranged on both sides below the fin opening (221) of each continuous fin (22).

4. The combined central air-conditioning high-efficiency fresh air heating system according to claim 3 is characterized in that: The waste heat recovery subsystem comprises a plate heat exchanger (3), wherein the plate heat exchanger (3) is provided with a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet, wherein the hot fluid inlet is used to connect to high-temperature cooling water of an external air compressor unit, the hot fluid outlet is connected to a liquid inlet (212) of a fin heat exchanger (2), the cold fluid inlet is connected to a liquid outlet (213) of the fin heat exchanger (2), and the cold fluid outlet is used to connect to low-temperature cooling water of an external air compressor unit.

5. The combined central air-conditioning high-efficiency fresh air heating system according to claim 4 is characterized in that: A pressure pump (4) is provided between the hot fluid inlet and the external air compressor unit.

6. The combined central air-conditioning high-efficiency fresh air heating system according to claim 4 is characterized in that: A heat preservation water tank (5) and an electric regulating valve (6) are arranged in sequence between the hot fluid outlet and the liquid inlet (212) of the fin heat exchanger (2).

7. The combined central air-conditioning high-efficiency fresh air heating system according to claim 4 is characterized in that: A water collecting tank (7) and a centrifugal pump (8) are provided in sequence between the liquid outlet (213) of the fin heat exchanger (2) and the cold fluid inlet.

8. The combined central air-conditioning high-efficiency fresh air heating system according to claim 1 is characterized in that: A temperature sensor (141) is provided in the housing (1) of the fresh air section (14).

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