Combined solar indoor heat recovery fresh air handling unit

Abstract

The utility model discloses a combined solar indoor heat recovery fresh air handling unit, which belongs to the technical field of air conditioning ventilation and comprises a box body, the interior of the box body is divided into seven chambers, four air inlets / outlets are arranged on the box body, and each air inlet / outlet is connected with one chamber; a surface air cooler is arranged between the sixth chamber and the seventh chamber; the first heat exchange core is arranged among the first, second, third and fourth chambers; the second heat exchange core is arranged among the fourth chamber, the fifth chamber, the sixth chamber and the seventh chamber; a first fan is arranged in the fifth cavity, and a tubular heat exchanger is arranged behind the first fan. Heat or cold carried by indoor return air is recycled through the heat exchange core; air is dehumidified through the surface air cooler, and heat exchange is conducted on the air through the tubular heat exchanger; solar and environmental radiation is utilized through the solar heat collection-radiation refrigeration device, cold water or hot water is manufactured and provided for a surface air cooler or a tubular heat exchanger in the unit, and the defect of high energy consumption of electric heating / refrigeration of a traditional total heat recovery unit is overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-conditioning ventilation, and particularly relates to a combined solar indoor heat recovery fresh air unit. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] Facing the challenges of climate change and energy shortage, building heat recovery technology has emerged as an important force to promote the green development of the building industry. With the concepts of energy conservation, emission reduction and sustainable development deeply rooted in people's hearts, and the continuous improvement of building energy efficiency standards, building heat recovery fresh air systems are playing an increasingly crucial role in new construction and renovation of existing buildings.

[0004] The heat recovery fresh air unit is an efficient energy recovery system that pre-treats fresh air by recovering heat or cold in the exhaust air, achieving energy conservation and environmental protection. This technology involves heat recovery, heat pump energy recovery and its application in building ventilation, aiming to significantly reduce building energy consumption, improve indoor environmental quality and meet the needs of different climate zones by efficiently recovering the heat energy in the exhaust air. It is one of the key technologies for modern buildings to improve energy efficiency and reduce energy consumption.

[0005] At present, the utilization rate of heat recovery fresh air systems in public buildings and residential buildings is relatively low. Only a small number of large public buildings are equipped with heat recovery fresh air units. Some buildings need to meet the dehumidification function, and most of the fresh air heat recovery units on the market only simply recover indoor cold or heat. Even for the heat recovery units with dehumidification equipment, due to dehumidification, the subsequent supply air needs to be reheated, resulting in a certain waste of cold energy of the equipment. Even though traditional heat recovery units have certain energy-saving effects, the cold and heat provided by the surface cooler for dehumidification and the heat exchanger for heating are still a large consumption; while solar energy resources are rich and the sky radiation is sufficient, but buildings fail to make reasonable use of these resources. Content of the Utility Model

[0006] In view of the above problems, the utility model provides a combined solar indoor heat recovery fresh air unit, which recovers the heat or cold carried by the indoor return air by setting a heat exchange core; dehumidifies the air by setting a surface cooler and exchanges heat with the air by setting a tubular heat exchanger; effectively utilizes solar radiation and environmental radiation by setting a solar heat collection-radiation refrigeration device to produce relative cold water or hot water and supply it to the surface cooler or tubular heat exchanger in the unit, overcoming the high energy consumption disadvantages of traditional total heat recovery units using electric heating or electric refrigeration.

[0007] To achieve the above object, the utility model adopts the following technical solutions:

[0008] A combined solar indoor heat recovery fresh air unit, comprising a box body, the interior of the box body is divided into seven chambers, and the box body is provided with an outdoor air inlet, an indoor air outlet, an indoor air inlet and an outdoor air outlet;

[0009] The outdoor air inlet is connected to the first chamber, the indoor air inlet is connected to the second chamber, the outdoor air outlet is connected to the third chamber, and the indoor air outlet is connected to the fifth chamber; the fourth chamber is between the third chamber and the fifth chamber, the sixth chamber is above the fourth chamber, and the seventh chamber is above the fifth chamber;

[0010] A surface cooler is arranged between the sixth chamber and the seventh chamber; a first heat exchange core is arranged between the first, second, third, and fourth chambers; a second heat exchange core is arranged between the fourth, fifth, sixth, and seventh chambers;

[0011] A second bypass air valve is arranged between the second chamber and the fourth chamber; a first bypass air valve is arranged between the fourth chamber and the fifth chamber;

[0012] On the box body, a solar heat collection-radiation refrigeration device is arranged above the outdoor air outlet.

[0013] Preferably, a second fan is installed in the third chamber, and a filter screen is installed behind the second fan; a first fan is installed in the fifth chamber, a tube heat exchanger is installed behind the first fan, and the tube heat exchanger is connected to a water collecting tray.

[0014] Preferably, filter screens are arranged in both the first chamber and the second chamber. In addition to installing the filter screen in the first chamber, a filter is also installed behind the filter screen.

[0015] Preferably, the first heat exchange core includes channel I and channel II. Channel I connects the first chamber and the fourth chamber, and channel II connects the third chamber and the second chamber.

[0016] Preferably, the second heat exchange core includes channel III and channel IV. Channel III connects the fourth and seventh chambers, and channel IV connects the fifth and sixth chambers.

[0017] Preferably, both the first heat exchange core and the second heat exchange core include polyester film, plastic partitions and a box body.

[0018] Preferably, the solar heat collection-radiation refrigeration device includes a solar heat collection-radiation refrigeration plate, the solar heat collection-radiation refrigeration plate is connected to a water tank and is arranged on the box body through a bracket.

[0019] Preferably, the solar heat collection-radiation refrigeration plate includes a transparent polyethylene film shell, and a plurality of copper tubes are rotatably connected inside the shell, and the copper tubes are connected to the water tank.

[0020] Preferably, a radiation heat collection plate and a radiation cooling plate are fixedly connected to the copper pipe, and the radiation cooling plate is arranged opposite to the radiation heat collection plate; a fixing plate is arranged below the copper pipe, and a heat insulation material is arranged on the side of the fixing plate away from the copper pipe.

[0021] Preferably, the water tank is provided with a heat insulation layer and is respectively connected to the surface cooler and the tubular heat exchanger through corresponding pipelines, and control valves are arranged on the respective pipelines.

[0022] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0023] The unit of the present utility model is provided with four air inlets / air outlets and seven chambers. Two heat exchange cores, two bypass air valves and a surface cooler are arranged between the chambers. By controlling the opening and closing of the surface cooler and the two bypass air valves, different channels can be formed for outdoor fresh air / indoor return air to pass through, so as to meet different usage requirements of users; by arranging chambers and heat exchange cores to separate the indoor return air and outdoor fresh air, so that they each have their own channels, and the heat exchange core can recover the heat or cold carried by the indoor return air for heat exchange of the outdoor fresh air; by arranging a surface cooler to dehumidify the air and a tubular heat exchanger to heat exchange the air; by arranging a solar heat collection-radiation cooling device to effectively utilize solar radiation and environmental radiation to produce relatively cold water or hot water and supply it to the surface cooler or tubular heat exchanger in the unit, overcoming the high energy consumption disadvantages of traditional total heat recovery units using electric heating or electric refrigeration. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The specification drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0025] Figure 1 It is a sectional view of the unit of the embodiment of the present utility model when there is fresh air and dehumidification requirement during operation;

[0026] Figure 2 It is a sectional view of the unit of the embodiment of the present utility model when there is fresh air and no dehumidification requirement during operation;

[0027] Figure 3 It is a sectional view of the unit of the embodiment of the present utility model when there is no fresh air and dehumidification requirement during operation;

[0028] Figure 4 It is a three-dimensional view of the unit of the embodiment of the present utility model;

[0029] Figure 5 It is a sectional view of the solar heat collection-radiation cooling plate of the embodiment of the present utility model;

[0030] Figure 6It is a three-dimensional view of the heat exchange core of an embodiment of the present utility model;

[0031] In the figure:

[0032] 1. Outdoor air inlet; 2. Filter screen; 3. Filter; 4. First heat exchange core; 401. Polyester film; 402. Plastic partition; 403. Box body; 5. Indoor air inlet; 6. First bypass air valve; 7. Outdoor air outlet; 8. Solar heat collection-radiation refrigeration plate; 801. Radiation heat collection plate; 802. Radiation refrigeration plate; 803. Copper tube; 804. Thermal insulation material; 805. Fixed plate; 806. Transparent polyethylene film shell; 9. Water tank; 10. Bracket; 11. Surface cooler; 12. Second heat exchange core; 13. Tube heat exchanger; 14. First fan; 15. Indoor air outlet; 16. Box body; 17. Water collecting tray; 18. Second bypass air valve; 19. Second fan. Detailed implementation manners

[0033] It should be noted that the following detailed descriptions are all illustrative and aim to provide further descriptions of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0034] Next, with reference to the accompanying drawings, the present utility model will be described in detail. A combined solar indoor heat recovery fresh air unit disclosed in this embodiment is as Figure 1 shown, which includes a box body 16. A solar heat collection-radiation refrigeration device is provided at the top of one side of the box body 16. An outdoor air inlet 1, an indoor air outlet 15, an indoor air inlet 5, and an outdoor air outlet 7 are opened on the box body 16.

[0035] It can be understood that the outdoor air inlet 1 is used to introduce outdoor air into this unit, the indoor air outlet 15 is used to send the air of the device into the room, the indoor air inlet 5 is used to send indoor air into this unit, and the outdoor air outlet 7 is used to send the air of this device into the outdoor environment.

[0036] As Figures 1-3 shown, inside the box body 16, it is divided into seven independent chambers as shown in the figure. The working state of this device is regulated by various components arranged between the chambers. For easy understanding, the seven chambers are respectively named the first to the seventh chambers in the order from bottom to top and from left to right. Among them, the outdoor air inlet is connected to the first chamber, the indoor air inlet is connected to the second chamber, the outdoor air outlet is connected to the third chamber, and the indoor air outlet is connected to the fifth chamber; the fourth chamber is between the third chamber and the fifth chamber, the sixth chamber is above the fourth chamber, and the seventh chamber is above the fifth chamber.

[0037] As Figures 1-3As shown in the figure, filters 2 are provided behind the outdoor air inlet 1 and the indoor air inlet 5 in the first chamber and the second chamber. Among them, in addition to installing the filter 2 behind the outdoor air inlet 1, a filter 3 is also installed behind the filter. In the third chamber, a second fan 19 is installed behind the outdoor air outlet 7, and a filter 2 is installed behind the second fan 19. In this embodiment, the filter is a primary filter, and the filter is a medium-efficiency filter.

[0038] A first heat exchange core 4 is installed between the first to third chambers where the outdoor air inlet 1, the indoor air inlet 5, and the outdoor air outlet 7 are located, and the fourth chamber in the middle. The first heat exchange core 4 includes channel I and channel II. Figures 1-3 In the figure, the solid thin arrows in the first heat exchange core 4 indicate the gas flow direction in channel I, and the dashed thin arrows indicate the gas flow direction in channel II. Channel I connects the first chamber and the fourth chamber, and channel II connects the third chamber and the second chamber. Through the first heat exchange core 4, the four chambers where it is located can achieve air flow circulation.

[0039] As Figures 1-3 shown, a second bypass valve 18 is also provided between the second chamber and the fourth chamber. Through the second bypass valve 18, it is possible to control whether the second chamber directly ventilates the fourth chamber. A first bypass valve 6 is provided between the fourth chamber and the fifth chamber, which is used to control whether the fourth chamber directly ventilates the fifth chamber. It can be understood that both the first bypass valve and the second bypass valve are electric valves with adjustable air volume.

[0040] As Figures 1-3 shown, in the fifth chamber, a first fan 14 is installed behind the indoor air outlet 15, and a tube heat exchanger 13 is installed behind the first fan 14. The tube heat exchanger 13 is connected to a water collecting tray 17. When the unit operates without dehumidification requirements in summer, there is a possibility of condensate when the outdoor hot and humid air passes through the tube heat exchanger, and the water collecting tray collects and discharges the condensate of the equipment. A surface cooler 11 is provided between the sixth chamber and the seventh chamber, and the surface cooler 11 is used to dehumidify the passing air. As Figures 1-3 shown, a second heat exchange core 12 is provided between the fourth, fifth, sixth, and seventh chambers. The second heat exchange core 12 includes channel III and channel IV. The dotted line arrows in the second heat exchange core 12 indicate the gas flow direction in channel III, and the long dashed line arrows indicate the gas flow direction in channel IV. It can also be said that a surface cooler 11 is provided at the outlet of channel III and the inlet of channel IV. Channel III connects the fourth and seventh chambers, and channel IV connects the fifth and sixth chambers.

[0041] As Figure 6 shown, the first heat exchange core 4 and the second heat exchange core 12 are of the same type of equipment, and both include a polyester film 401, a plastic partition 402, and a box body 403, which are used to exchange heat for the passing air.

[0042] As Figure 4 shown, in this embodiment, the box body 16 is in a "Z" shape. It can be understood that it can also be in other shapes. The solar heat collection-radiation refrigeration device is arranged above the outdoor air outlet. In other embodiments, it can also be separately installed on the exterior wall of the building close to the box body 16, but it shall not block the respective air inlets and outlets of the box body. The solar heat collection-radiation refrigeration device includes a solar heat collection-radiation refrigeration plate 8. The solar heat collection-radiation refrigeration plate 8 is connected to a water tank 9 and is arranged on the box body 16 through a bracket 10, located above the outdoor air outlet. It should be noted that the water tank 9 is connected to a surface cooler 11 and a tubular heat exchanger 13, and is used to supply cold water or hot water to the surface cooler 11 or the tubular heat exchanger 13. It can be understood that the water tank 9 is respectively connected to the surface cooler 11 and the tubular heat exchanger 13 through corresponding pipelines, and control valves are arranged on their respective pipelines to control the water supply from the water tank 9 to the surface cooler 11 or the tubular heat exchanger 13.

[0043] As Figure 5 shown, the solar heat collection-radiation refrigeration plate 8 includes a transparent polyethylene film housing 806. Inside the housing, a plurality of copper tubes 803 are rotatably connected. A radiation heat collection plate 801 is fixedly connected to the copper tubes 803. On the back of the radiation heat collection plate 801, a radiation refrigeration plate 802 is arranged on the copper tubes 803. It can be understood that both the radiation heat collection plate 801 and the radiation refrigeration plate 802 adopt existing technologies. Among them, the radiation heat collection plate 801 is the most common and can absorb and convert solar energy into heat energy to heat the water in the copper tubes 803, which will not be elaborated here; the radiation refrigeration plate 802 is made of a radiation refrigeration film that has emerged in recent years. When the radiation refrigeration plate 802 faces the sky, the radiation refrigeration film uses the high transmittance in the atmospheric window (the band of 8-13 μm) to transfer its own waste heat to the low-temperature atmosphere and the low-temperature outer space through radiation heat exchange, so that the water in the copper tubes 803 obtains a cooling effect. The radiation refrigeration film is made of existing technologies and is a 50-μm-thick film formed by randomly embedding many silica microspheres with a diameter of about 8 μm in polymethylpentene.

[0044] Inside the housing, a fixing plate 805 is further arranged below the copper tubes 803 to strengthen the strength of the housing. On the side of the fixing plate 805 away from the copper tubes 803, a heat insulation material 804 is arranged. The copper tubes 803 are connected to the water tank 9. The function of the water tank 9 is to serve as an energy storage module, mainly for energy storage, and does not have the functions of refrigeration and heating. A heat insulation layer is arranged on the outer layer of the water tank 9 to reduce the influence of the outdoor environment on the inside of the water tank to a certain extent.

[0045] The solar heat collection-radiation cooling plate 8 can be switched between heating and cooling modes according to different requirements. When the water tank 9 needs to provide precooled cold water for the surface cooler 11, rotate the copper pipe 803, face the radiation cooling plate 802 towards the sun, open the pipeline control valve between the water tank 9 and the surface cooler 11, and close the pipeline control valve between the water tank 9 and the tubular heat exchanger 13. When the water tank 9 needs to provide hot water for the tubular heat exchanger 13, rotate the copper pipe 803, face the solar heat collection plate 801 towards the sun, close the pipeline control valve between the water tank 9 and the surface cooler 11, and open the pipeline control valve between the water tank 9 and the tubular heat exchanger 13.

[0046] Working principle:

[0047] As Figure 1 shown, when there is a requirement for fresh air dehumidification in summer, turn on the first fan 14 and the second fan 19, close the first bypass air valve 6, the second bypass air valve 18, and the tubular heat exchanger 13, turn on the surface cooler 11, rotate the copper pipe 803 in the solar heat collection-radiation cooling plate 8, face the radiation cooling plate 802 towards the sun, and keep the water tank 9 connected to the surface cooler 11 and disconnected from the tubular heat exchanger 13.

[0048] During the operation of the unit, under the action of the second fan 19, the indoor return air enters the box body 16 from the indoor air inlet 5, passes through the filter screen 2, and then enters the third chamber through the channel II of the first heat exchange core 4, and finally is discharged from the outdoor air outlet 7 of the unit.

[0049] Under the action of the first fan 14, the outdoor fresh air enters the box body 16 through the outdoor air inlet 1, removes impurities through the filter screen 2 and the filter 3, exchanges heat through the channel I of the first heat exchange core 4 and the channel III of the second heat exchange core 12, is dehumidified through the surface cooler 11, exchanges heat through the channel IV of the second heat exchange core 12, and finally the outdoor fresh air is sent into the room through the indoor air outlet 15.

[0050] As Figure 2 shown, when there is no requirement for fresh air dehumidification in summer, turn on the first fan 14 and the second fan 19, open the first bypass air valve 6, close the second bypass air valve 18, turn on the tubular heat exchanger 13, turn off the surface cooler 11, rotate the copper pipe 803 in the solar heat collection-radiation cooling plate 8, face the radiation cooling plate 802 towards the sun, and keep the water tank 9 connected to the tubular heat exchanger 13 and disconnected from the surface cooler 11.

[0051] When the unit is in operation, the indoor return air still discharges from the outdoor air outlet 7 of the unit through passage II; after the outdoor fresh air passes through passage I of the first heat exchange core 4, it no longer enters passage III, but directly passes through the first bypass air valve 6, exchanges heat with the relatively cold water in the tube heat exchanger 13, and then the outdoor fresh air is sent into the room by the first fan 14 from the indoor air outlet 15.

[0052] As Figure 3 shown, when there is a requirement for dehumidification without fresh air in summer, turn on the first fan 14, turn off the second fan 19, close the first bypass air valve 6, open the second bypass air valve 18, turn off the tube heat exchanger 13, turn on the surface cooler 11, rotate the copper tube 803 in the solar heat collection-radiation refrigeration plate 8, face the radiation refrigeration plate 802 towards the sun, and keep the water tank 9 connected to the surface cooler 11 and disconnected from the tube heat exchanger 13.

[0053] When the unit is in operation, the indoor return air enters the box body 16 through the indoor air inlet 5, removes impurities through the filter screen 2, then passes through the second bypass air valve 18, exchanges heat in passage III of the second heat exchange core 12, is dehumidified by the surface cooler 11, then exchanges heat through passage IV to increase the temperature of the air dehumidified by the surface cooler 11, and finally is sent into the room by the first fan 14 from the indoor air outlet 15.

[0054] When operating in winter, as Figure 2 shown, turn on the first fan 14 and the second fan 19, open the first bypass air valve 6, close the second bypass air valve 18, turn on the tube heat exchanger 13, turn off the surface cooler 11, rotate the copper tube 803 in the solar heat collection-radiation refrigeration plate 8, face the radiation heat collection plate 801 towards the sun, and keep the water tank 9 connected to the tube heat exchanger 13 and disconnected from the surface cooler 11.

[0055] When the unit is in operation, the indoor return air still discharges from the outdoor air outlet 7 of the unit through passage II; the outdoor fresh air enters the box body 16 through the outdoor air inlet 1, removes impurities through the filter screen 2 and the filter 3, is preliminarily heated through passage I of the first heat exchange core 4, then passes through the first bypass air valve 6, exchanges heat through the tube heat exchanger 13, and then the outdoor fresh air is sent into the room by the first fan 14 from the indoor air outlet 15.

[0056] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A combined solar indoor heat recovery fresh air unit, characterized in that It includes a box body, which is internally divided into seven chambers. The box body is provided with an outdoor air inlet, an indoor air outlet, an indoor air inlet and an outdoor air outlet. The outdoor air inlet is connected to the first chamber, the indoor air inlet is connected to the second chamber, the outdoor air outlet is connected to the third chamber, and the indoor air outlet is connected to the fifth chamber. The fourth chamber is between the third chamber and the fifth chamber, the sixth chamber is above the fourth chamber, and the seventh chamber is above the fifth chamber. A surface cooler is arranged between the sixth chamber and the seventh chamber. The first heat exchange core is arranged between the first, second, third and fourth chambers. The second heat exchange core is arranged between the fourth, fifth, sixth and seventh chambers. A second bypass air valve is arranged between the second chamber and the fourth chamber. A first bypass air valve is arranged between the fourth chamber and the fifth chamber. On the box body, a solar heat collection-radiation refrigeration device is arranged above the outdoor air outlet.

2. The combined solar indoor heat recovery fresh air unit according to claim 1, characterized in that, A second fan is installed in the third chamber, and a filter screen is installed behind the second fan. A first fan is installed in the fifth chamber, and a tubular heat exchanger is installed behind the first fan. The tubular heat exchanger is connected to a water collecting tray.

3. The combined solar indoor heat recovery fresh air unit according to claim 1, characterized in that, Filter screens are arranged in both the first chamber and the second chamber. In addition to installing the filter screen in the first chamber, a filter is also installed behind the filter screen.

4. The combined solar indoor heat recovery fresh air unit according to claim 1, characterized in that, The first heat exchange core includes channel Ⅰ and channel Ⅱ. Channel Ⅰ connects the first chamber and the fourth chamber, and channel Ⅱ connects the third chamber and the second chamber.

5. The combined solar indoor heat recovery fresh air unit according to claim 1, characterized in that The second heat exchange core includes channel Ⅲ and channel Ⅳ. Channel Ⅲ connects the fourth and seventh chambers, and channel Ⅳ connects the fifth and sixth chambers.

6. The combined solar indoor heat recovery fresh air unit according to claim 1, characterized in that, Both the first heat exchange core and the second heat exchange core include polyester films, plastic partitions and box bodies.

7. The combined solar indoor heat recovery fresh air unit according to claim 1, characterized in that, The solar heat collection-radiation refrigeration device includes a solar heat collection-radiation refrigeration plate, which is connected to a water tank and is arranged on the box body through a bracket.

8. The combined solar indoor heat recovery fresh air unit according to claim 7, characterized in that, The solar heat collection-radiation refrigeration plate includes a transparent polyethylene film housing, and a plurality of copper tubes are rotatably connected inside the housing. The copper tubes are connected to the water tank.

9. The combined solar indoor heat recovery fresh air unit according to claim 8, wherein Radiation heat collection plates and radiation refrigeration plates are fixedly connected to the copper tubes. The radiation refrigeration plates are arranged opposite to the radiation heat collection plates. A fixing plate is arranged below the copper tubes, and a heat insulation material is arranged on the side of the fixing plate away from the copper tubes.

10. A combined solar indoor heat recovery fresh air unit according to claim 7, characterized in that, The water tank is provided with a heat insulation layer and is respectively connected to the surface cooler and the tubular heat exchanger through corresponding pipelines. Control valves are arranged on their respective pipelines.

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