Modular fresh air handling unit and method of use thereof

Abstract

The present application relates to the field of HVAC energy saving technology, in particular to a modular fresh air handling unit and a use method thereof, comprising: a rotary dehumidification module, used for adsorbing moisture in the entering outdoor air or indoor return air; a CO2 adsorption module, used for removing CO2 in the entering outdoor air or indoor return air; and a first heat pump module. The present application dries and dehumidifies the entering outdoor air or indoor return air through the rotary dehumidification module, and adsorbs CO2 through the CO2 adsorption module, cooperates with the first heat pump module to cool in the air treatment process, and heats and humidifies according to the need, sends clean air into the room, ensures the air quality in the room, reduces the dependence on fresh air volume through the use of indoor return air, and reduces the main energy consumption source of fresh air load.

Description

Technical Field

[0001] This invention relates to the field of HVAC energy-saving technology, specifically to a modular fresh air handling unit and its usage method. Background Technology

[0002] Currently, densely populated buildings commonly use fresh air systems to introduce outdoor air and reduce CO2 concentration in order to maintain indoor air quality. Traditional air conditioning systems handle indoor moisture load through refrigeration and dehumidification, forcing chiller units to operate in inefficient zones and limiting system energy efficiency improvements. Existing return air has high concentrations of CO2 / VOCs (volatile organic compounds at room temperature, such as formaldehyde and benzene), but energy recovery is only possible through heat exchange, not mass exchange, resulting in inefficient utilization of return air heat and humidity. Furthermore, CO2 adsorption equipment is not deeply coupled with dehumidification and heat pump systems. To achieve pollutant control, additional independent chemical adsorption equipment or air purification modules are typically required, leading to complex system structures, large space requirements, increased air resistance, and difficulty in achieving coordinated matching of heating and cooling capacity and energy efficiency optimization between different devices.

[0003] Most existing fresh air systems with pollutant treatment capabilities use fixed adsorption modules or disposable filters, which suffer from limited adsorption capacity, difficulty in regeneration, and frequent replacement, resulting in high long-term operating costs. Some devices using rotary adsorption technology are often designed for only a single pollutant and cannot simultaneously achieve efficient synergistic removal of CO2 and VOCs. In addition, existing systems often require continuous operation of dehumidification and adsorption modules during transitional seasons or under low humidity conditions, leading to increased ineffective energy consumption, higher system resistance, and overall low energy efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings and provide a modular fresh air handling unit and its usage method that can simultaneously and efficiently remove CO2 and VOCs, and reduce energy consumption and system resistance during transitional seasons or under low humidity conditions.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a modular fresh air handling unit, comprising: The rotary dehumidifier module is used to adsorb moisture from incoming outdoor air or indoor return air. The CO2 adsorption module is used to remove CO2 from incoming outdoor air or indoor return air. The first heat pump module includes a precooling coil disposed at the front end of the rotary dehumidification module, a refrigeration coil disposed between the rotary dehumidification module and the CO2 adsorption module, a first compressor connected to the precooling coil, a first heating coil disposed at the rear end of the CO2 adsorption module, and a first throttling valve connected to the first heating coil and connected to the precooling coil and the refrigeration coil.

[0006] Furthermore, it also includes a second heating coil connected to the first compressor and the first throttle valve. The second heating coil is used to heat the regenerated air to the desorption temperature during the regeneration adsorption stage. The heated regenerated air is then discharged after being desorbed by the CO2 adsorption module and the rotary dehumidification module in sequence.

[0007] Furthermore, a bypass vent is provided between the CO2 adsorption module and the first heating coil, and an air valve is provided between the rotary dehumidification module and the CO2 adsorption module. This is used to allow outdoor air to directly enter the first heating coil through the bypass vent and be heated before being sent into the room when the outdoor air is dry, or to allow indoor return air to bypass the rotary dehumidification module and be directly discharged during the regeneration process by adjusting the opening of the air valve.

[0008] Furthermore, it also includes a heat balance module, which is connected to the first compressor and the first throttle valve through a pipeline, and is used to dynamically adjust the refrigerant flow rate to achieve dynamic balance between the cold and hot ends.

[0009] Furthermore, the unit casing is provided with an air supply port at the thermal balance module, which is used to supply air during the dynamic balancing process of the thermal balance module.

[0010] Furthermore, the output end of the first heating coil is provided with a humidification section, which is used to humidify the heated air before it is discharged by the blower.

[0011] Furthermore, it also includes a VOCs adsorption module, which is used to receive air containing VOCs, process it, and then send it to the CO2 adsorption module to remove CO2 carried in the air.

[0012] Furthermore, it also includes a second heat pump module, which includes an evaporator, a second compressor, a third heating coil, and a second throttle valve connected to each other. The third heating coil is used to heat the regeneration air to the desorption temperature during the regeneration adsorption stage, so as to heat the regeneration end of the VOCs rotor module and make it reach the desorption state. The heated regeneration air carrying VOCs passes through the VOCs adsorption module and is discharged carrying the desorbed VOCs.

[0013] A method of using a modular unit, comprising an air purification process and a regeneration and desorption process; When the air does not carry VOCs: The air purification process specifically includes: a1. Perform preliminary filtration on outdoor air or indoor return air, and then immediately introduce it into the pre-cooling coil for initial cooling. a2. The air that has been preliminarily cooled is sent into the rotary dehumidification module to adsorb the moisture in the air and dry the air. a3. The dehumidified air is cooled again through the refrigeration coil; a4. After being cooled down again, the air enters the CO2 adsorption module to remove the carbon dioxide it carries. Then it is heated by the first heating coil and humidified by the humidification section as needed before being sent into the room. The regeneration and desorption process specifically includes: b1. Regenerated air is fed into the second heating coil by a blower, and the second heating coil heats the regenerated air to the desorption temperature. b2. The heated regenerated air passes through the CO2 adsorption module and the rotary dehumidification module to desorb the CO2 adsorption module and the rotary dehumidification module. Then, the regenerated waste gas carrying water vapor and pollutants is discharged from the building by the blower.

[0014] Furthermore, when VOCs are present in the air: The air purification process specifically includes: c1. The return air carrying VOCs is sent into the VOCs adsorption module by the blower, and the VOCs in the return air are adsorbed by the VOCs adsorption module. c2. The return air treated by the VOCs adsorption module is sent into the CO2 adsorption module and mixed with the outdoor air that is about to enter the CO2 adsorption module for unified treatment. The regeneration and desorption process specifically includes: d1. The regenerated air is sent into the second heat pump module, and the regenerated air is heated to the desorption temperature through the third heating coil; d2. The VOCs adsorption module treats the heated return air and then discharges it from the building through a blower.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention dries and dehumidifies incoming outdoor air or indoor return air by setting up a rotary dehumidification module, and adsorbs CO2 through a CO2 adsorption module. In conjunction with a first heat pump module, it cools the air during the air handling process and heats and humidifies it as needed, delivering clean air into the room to ensure indoor air quality. By utilizing indoor return air, it reduces dependence on fresh air volume and reduces the fresh air load, a major energy consumption source. After the rotary dehumidification module removes moisture from the air, the pre-cooling coil and cooling coil only need to undertake part of the sensible heat dehumidification or auxiliary dehumidification function. Compared with the lower chilled water supply temperature of traditional dehumidifier units, it essentially achieves the same energy-saving effect as "raising the chilled water supply temperature" in traditional systems, that is, reducing the deep cooling requirements of the refrigeration system and improving overall energy efficiency. 2. This invention solves the problem of limited processing functions in existing air equipment by setting up a VOCs adsorption module. In conjunction with a rotary dehumidification module, a CO2 adsorption module, a first heat pump module, and a second heat pump module, dehumidification, cooling, and pollutant adsorption are integrated into a modular unit. This achieves simultaneous deep removal of pollutants and precise control of temperature and humidity. It can not only efficiently remove CO2, but also adsorb various VOCs such as formaldehyde and benzene as needed, thus providing multi-dimensional protection for a healthy indoor environment and meeting higher standards of comfort and health requirements. 3. By setting up a bypass ventilation duct, the present invention switches the air purification channel during transitional seasons and low humidity conditions, bypassing the rotary dehumidification module, without having to operate all functional sections, which significantly reduces energy consumption and system operating resistance. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of an embodiment of the present invention without a VOCs adsorption module.

[0017] Figure 2 This is a schematic diagram of a VOCs adsorption module according to an embodiment of the present invention.

[0018] In the diagram: 1. Rotary dehumidification module; 2. CO2 adsorption module; 3. First heat pump module; 31. Precooling coil; 32. Cooling coil; 33. First compressor; 34. First heating coil; 35. First throttling valve; 36. Second heating coil; 4. Bypass duct; 41. Make-up air inlet; 42. Bypass valve; 5. Thermal balance module; 37. Humidification section; 6. VOCs adsorption module; 7. Second heat pump module; 71. Evaporator; 72. Second compressor; 73. Third heating coil; 74. Second throttling valve. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-2 .

[0021] The modular fresh air handling unit of the present invention is characterized by comprising: Rotary dehumidification module 1 is used to adsorb moisture in incoming outdoor air or indoor return air; CO2 adsorption module 2 is used to remove CO2 from incoming outdoor air or indoor return air; The first heat pump module 3 includes a precooling coil 31 disposed at the front end of the rotary dehumidification module 1, a refrigeration coil 32 disposed between the rotary dehumidification module 1 and the CO2 adsorption module 2, a first compressor 33 connected to the precooling coil 31, a first heating coil 34 disposed at the rear end of the CO2 adsorption module 2, and a first throttling valve 35 connected to the first heating coil 34 and connected to the precooling coil 31 and the refrigeration coil 32.

[0022] By setting up a rotary dehumidification module 1, moisture in the incoming outdoor air or indoor return air is adsorbed and dried. Then, CO2 is removed by the CO2 adsorption module 2. In conjunction with the first heat pump module 3, the air is initially cooled by the pre-cooling module before entering the rotary dehumidification module 1. After the air is dehumidified in the rotary dehumidification module 1, it is cooled again by the cooling module. After the air is treated by the CO2 adsorption module 2, it is heated to meet the indoor temperature requirements. This utilizes both outdoor air and indoor return air, reducing the dependence on fresh air volume from the source and reducing the fresh air load.

[0023] In one embodiment, a second heating coil 36 connected to the first compressor 33 and the first throttle valve 35 is also included. The second heating coil 36 is used to heat the regeneration air to the desorption temperature during the regeneration adsorption stage. The heated regeneration air is then discharged after desorption through the CO2 adsorption module 2 and the rotary dehumidification module 1. This design allows the regeneration air to be heated to the desorption temperature by the second heating coil 36 in the regeneration adsorption stage, thereby facilitating the desorption of CO2 adsorption module 2 and rotary dehumidification module 1, and facilitating the discharge of the desorbed air, thus achieving the desorption of CO2 adsorption module 2 and rotary dehumidification module 1.

[0024] In one embodiment, a bypass vent 4 is provided between the CO2 adsorption module 2 and the first heating coil 34, and an air valve 11 is provided between the rotary dehumidification module 1 and the CO2 adsorption module 2. This allows outdoor air to directly enter the first heating coil 34 through the bypass vent 4 and be heated before being sent into the room when the outdoor air is dry, or allows indoor return air to bypass the rotary dehumidification module 1 and be directly discharged during the regeneration process by adjusting the opening of the air valve 11. This design allows for direct delivery of dry outdoor air to the first heating coil 34 through the bypass vent 4 during transitional seasons or low-temperature conditions by adjusting the opening of the air valve 11, eliminating the need for processing by the rotary dehumidification module 1 and the CO2 adsorption module 2. Furthermore, at the regeneration end, when the indoor return air is dry, adjusting the opening of the air valve 11 eliminates the need for processing by the rotary dehumidification module 1, allowing the indoor return air to bypass the rotary dehumidification module 1 and be directly discharged, thereby reducing system operating resistance and energy consumption.

[0025] In one embodiment, a heat balance module 5 is also included. The heat balance module 5 is connected to the first compressor 33 and the first throttling valve 35 via a pipe, and is used to dynamically adjust the refrigerant flow rate to achieve dynamic balance between the hot and cold outputs. This design, by dynamically adjusting the refrigerant flow distribution through the heat balance module 5, ensures dynamic balance between the hot and cold outputs of the first heat pump module 3, thereby guaranteeing that the cooling capacity used for outdoor air or indoor return air cooling and the heating capacity used for desorption and regeneration are matched, avoiding energy efficiency degradation due to imbalance between hot and cold supply and demand.

[0026] In one embodiment, the unit casing is provided with an air supply port 51 at the thermal balance module 5. The air supply port 51 is used to supply air during the dynamic balancing process of the thermal balance module 5. This design facilitates the use of the thermal balance module.

[0027] In one embodiment, the output end of the first heating coil 34 is provided with a humidification section 37, which is used to humidify the heated air before it is discharged by a blower. This design, by setting the humidification section 37, allows for humidification of the heated air as needed, thereby meeting indoor air quality requirements.

[0028] In one embodiment, a VOCs adsorption module 6 is also included. The VOCs adsorption module 6 receives air containing VOCs, processes it, and then sends it to the CO2 adsorption module 2, where the CO2 adsorption module 2 removes CO2 from the air. This design, by including the VOCs adsorption module 6, allows for the adsorption of VOCs in the return air. The treated return air is then sent to the CO2 adsorption module 2, where it is mixed with the air about to enter the CO2 adsorption module 2 for unified processing, thus improving the utilization rate of the return air.

[0029] In one embodiment, a second heat pump module 7 is also included. The second heat pump module 7 includes an evaporator 71, a second compressor 72, a third heating coil 73, and a second throttle valve 74, all connected to each other. The third heating coil 73 heats the regeneration air to the desorption temperature during the regeneration adsorption stage to heat the regeneration end of the VOCs rotary module, bringing it to a desorption state. The heated regeneration air carrying VOCs passes through the VOCs adsorption module 6 and is discharged carrying the desorbed VOCs. This design allows the regeneration air to be heated to the desorption temperature via the third heating coil 73 in the second heat pump module 7, and then discharged carrying the desorbed VOCs after passing through the VOCs adsorption module 6, thus achieving desorption and regeneration treatment of the regeneration air.

[0030] A method of using a modular unit, comprising an air purification process and a regeneration and desorption process; When the air does not carry VOCs: The air purification process specifically includes: a1. Perform preliminary filtration on outdoor air or indoor return air, and then put it into the pre-cooling coil 31 for preliminary cooling. a2. The air that has been preliminarily cooled is sent into the rotary dehumidification module 1 to adsorb the moisture in the air and dry the air. a3. The dehumidified air is cooled again through the refrigeration coil 32; a4. After being cooled down again, the air enters the CO2 adsorption module 2 to remove the carbon dioxide it carries. Then it is heated by the first heating coil 34 and humidified by the humidification section 37 as needed before being sent into the room. The regeneration and desorption process specifically includes: b1. Regenerated air is sent into the second heating coil 36 by a blower, and the second heating coil 36 heats the regenerated air to the desorption temperature. b2. The heated regenerated air passes through CO2 adsorption module 2 and rotary dehumidification module 1 to desorb CO2 adsorption module 2 and rotary dehumidification module 1. Then, the regenerated waste gas carrying water vapor and pollutants is discharged from the building by the blower.

[0031] Furthermore, when VOCs are present in the air: The air purification process specifically includes: c1. The return air carrying VOCs is sent into the VOCs adsorption module 6 by the blower, and the VOCs in the return air are adsorbed by the VOCs adsorption module 6. c2. The return air treated by the VOCs adsorption module 6 is sent into the CO2 adsorption module 2 and mixed with the outdoor air that is about to enter the CO2 adsorption module 2 for unified treatment. The regeneration and desorption process specifically includes: d1. The regenerated air is sent into the second heat pump module 7 and heated to the desorption temperature by the third heating coil 73. The regenerated air includes outdoor fresh air or indoor return air. d2. The VOCs adsorption module 6 treats the heated return air and then discharges it from the building through a blower.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the 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 the present invention.

Claims

1. A modular fresh air handling unit, characterized in that, include: Rotary dehumidification module (1) is used to adsorb moisture in incoming outdoor air or indoor return air; CO2 adsorption module (2) is used to remove CO2 from incoming outdoor air or indoor return air; The first heat pump module (3) includes a precooling coil (31) disposed at the front end of the rotary dehumidification module (1), a refrigeration coil (32) disposed between the rotary dehumidification module (1) and the CO2 adsorption module (2), a first compressor (33) connected to the precooling coil (31), a first heating coil (34) disposed at the rear end of the CO2 adsorption module (2), and a first throttling valve (35) connected to the first heating coil (34) and connected to the precooling coil (31) and the refrigeration coil (32).

2. The modular fresh air handling unit according to claim 1, characterized in that, It also includes a second heating coil (36) connected to the first compressor (33) and the first throttle valve (35). The second heating coil (36) is used to heat the regenerated air to the desorption temperature during the regeneration adsorption stage. The heated regenerated air is desorbed by the CO2 adsorption module (2) and the rotary dehumidification module (1) in sequence and then discharged.

3. The modular fresh air handling unit according to claim 2, characterized in that, A bypass vent (4) is provided between the CO2 adsorption module (2) and the first heating coil (34). A wind valve (11) is provided between the rotary dehumidification module (1) and the CO2 adsorption module (2) and the unit casing, respectively. When the outdoor air is dry, the opening of the wind valve (11) is adjusted so that the outdoor air can directly enter the first heating coil (34) through the bypass vent (4) and be heated before being sent into the room. Alternatively, during the regeneration process, the opening of the wind valve (11) is adjusted so that the indoor return air bypasses the rotary dehumidification module (1) and is directly discharged.

4. The modular fresh air handling unit according to claim 1, characterized in that, It also includes a heat balance module (5), which is connected to the first compressor (33) and the first throttle valve (35) through a pipe, and is used to dynamically adjust the flow rate of the refrigerant so that the output of the cold and hot ends is dynamically balanced.

5. The modular fresh air handling unit according to claim 4, characterized in that, The unit casing is provided with an air supply port (51) at the heat balance module (5), and the air supply port (51) is used to supply air during the dynamic balancing process of the heat balance module (5).

6. The modular fresh air handling unit according to claim 1, characterized in that, The output end of the first heating coil (34) is provided with a humidification section (37) for humidifying the heated air before it is discharged by a blower.

7. The modular fresh air handling unit according to claim 1, characterized in that, It also includes a VOCs adsorption module (6), which is used to receive air containing VOCs, process it and send it to the CO2 adsorption module (2), and remove CO2 carried in the air through the CO2 adsorption module (2).

8. The modular fresh air handling unit according to claim 7, characterized in that, It also includes a second heat pump module (7), which includes an evaporator (71), a second compressor (72), a third heating coil (73), and a second throttle valve (74) connected to each other. The third heating coil (73) is used to heat the regeneration air to the desorption temperature during the regeneration adsorption stage, so as to heat the regeneration end of the VOCs rotor module and make it reach the desorption state. After the heated regeneration air passes through the VOCs adsorption module (6), it carries the desorbed VOCs and is discharged.

9. A method of using a modular unit, characterized in that, The modular unit according to any one of claims 1-6 includes an air purification process and a regeneration desorption process; When the air does not carry VOCs: The air purification process specifically includes: a1. Perform preliminary filtration on outdoor air or indoor return air, and then put it into the pre-cooling coil (31) for preliminary cooling; a2. The air that has been preliminarily cooled is sent into the rotary dehumidification module (1) to adsorb the moisture in the air and dry the air. a3. The dehumidified air is cooled again through the refrigeration coil (32); a4. After being cooled down again, the air enters the CO2 adsorption module (2) to remove the carbon dioxide it carries. Then it is heated by the first heating coil (34) and humidified by the humidification section (37) as needed before being sent into the room. The regeneration and desorption process specifically includes: b1. The regenerated air is sent into the second heating coil (36) by the blower, and the second heating coil (36) heats the regenerated air to the desorption temperature; b2. The heated regenerated air passes through the CO2 adsorption module (2) and the rotary dehumidification module (1) to desorb the CO2 adsorption module (2) and the rotary dehumidification module (1), and then the regenerated waste gas carrying water vapor and pollutants is discharged from the building by the blower.

10. The method of using the modular unit according to claim 9, characterized in that, When VOCs are carried in the air: The air purification process specifically includes: c1. The return air carrying VOCs is sent into the VOCs adsorption module (6) by the blower, and the VOCs in the return air are adsorbed by the VOCs adsorption module (6). c2. The return air after being treated by the VOCs adsorption module (6) is sent into the CO2 adsorption module (2) and mixed with the outdoor air that is about to enter the CO2 adsorption module (2) for unified treatment. The regeneration and desorption process specifically includes: d1. The regenerated air is sent into the second heat pump module (7), and the regenerated air is heated to the desorption temperature through the third heating coil (73); d2. The VOCs adsorption module (6) treats the heated return air and then discharges it from the building through a blower.

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