Energy-saving combined air conditioner and method of use thereof

Abstract

The application discloses an energy-saving combined air conditioner and a use method thereof, which comprises a fresh air section, a mixed air section, a surface cooling section, a heating section, a fan section and an air outlet section; the mixed air section is connected with a return air pipe; the heating section is internally provided with a steam heat exchanger; the application further comprises an environment heat exchange chamber, a working medium storage tank and a control system; a return air heat exchanger unit is arranged in the return air pipe; the environment heat exchange chamber is internally provided with an environment heat exchanger; the working medium storage tank is internally provided with low-boiling-point working medium; the working medium storage tank is provided with an inlet liquid pipe at an inlet and an outlet liquid pipe at an outlet; the outlet liquid pipe is connected with the environment heat exchanger; the environment heat exchanger is connected with the steam heat exchanger at an outlet; the steam heat exchanger is connected with the inlet liquid pipe; the outlet liquid pipe is further connected with an inlet of the return air heat exchanger unit; an outlet of the return air heat exchanger unit is connected with an inlet of the environment heat exchanger through a pipeline; an outlet of the environment heat exchanger is further connected with the inlet liquid pipe through a pipeline; corresponding electromagnetic valves are arranged on the pipelines.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning equipment technology, specifically relating to an energy-saving modular air conditioner and its usage method. Background Technology

[0002] A modular air conditioning unit is an air handling device assembled from various air handling functional sections. A typical modular air conditioning unit includes a fresh air section, return air section, cooling coil section, heating section, humidification section, fan section, and filtration section, etc., achieving different air handling requirements through different combinations of functional sections. Modular air conditioning units are generally used in large indoor spaces such as factories.

[0003] There are two operating environments for modular air conditioners. In the first, when the outside temperature is high, cold air needs to be blown out to cool the indoor environment. In this case, the cold source is chilled water. The chilled water passes through a heat exchanger, where the airflow undergoes heat exchange and cools down. It is then dehumidified, and then heated to a suitable temperature using a heat exchanger carrying hot steam. Finally, the air is filtered before being blown into the room. The use of hot steam to heat the airflow in this process consumes a significant amount of steam, resulting in energy loss. The second operating environment for modular air conditioners is when the outdoor temperature is low and humid, which is more common in southern regions. In this case, the modular air conditioner needs to heat the air and remove a large amount of moisture, and then humidify it appropriately before being introduced into the room. This process requires dehumidifying the air using chilled water in the cooling coil, which consumes a significant amount of chilled water and also leads to some energy loss. Summary of the Invention

[0004] The purpose of this invention is to address the problem of excessive steam and chilled water consumption in existing modular air conditioners, and to propose an energy-saving modular air conditioner and its usage method. This invention can save steam and chilled water during the use of modular air conditioners, thus achieving energy conservation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An energy-saving modular air conditioner includes a fresh air section, a mixing air section, a surface cooling section, a heating section, a fan section, and an air outlet section connected in sequence. The mixing air section is connected to a return air duct. A steam heat exchanger is installed in the heating section. The system also includes an ambient heat exchange chamber, a working fluid storage tank, and a control system. A return air heat exchanger unit is installed in the return air duct. An ambient heat exchanger is installed in the ambient heat exchange chamber. The working fluid storage tank contains a low-boiling-point working fluid. The inlet of the working fluid storage tank is equipped with an inlet pipe, and the outlet is equipped with an outlet pipe. The outlet pipe is connected to the inlet of the ambient heat exchanger. The outlet of the ambient heat exchanger is connected to the inlet of the steam heat exchanger via a pipe. The outlet of the steam heat exchanger is connected to the inlet pipe via a pipe. The outlet pipe is also connected to the inlet of the return air heat exchanger unit via a pipe. The outlet of the return air heat exchanger unit is connected to the inlet of the ambient heat exchanger via a pipe. The outlet of the ambient heat exchanger is also connected to the inlet pipe via a pipe. Each pipe is equipped with a corresponding solenoid valve.

[0007] The fresh air section, mixing section, surface cooling section, heating section, fan section, and air outlet section are all functional sections of a traditional combined fan; the return air duct is used to send indoor airflow into the mixing section to mix with outside air; the steam heat exchanger is used to raise the air temperature; the environmental heat exchanger in the environmental heat exchange chamber is used to vaporize the liquid working fluid; the liquid working fluid is a low-boiling-point, easily vaporized liquid that readily absorbs heat for vaporization and releases heat for liquefaction; the liquid inlet pipe is used to introduce the liquefied working fluid into the working fluid storage tank; the liquid outlet pipe is used to discharge the liquid working fluid from the working fluid storage tank. Steam can be passed through the steam heat exchanger; the liquid working fluid is heated and vaporized in the ambient heat exchanger and then enters the steam heat exchanger to replace the hot steam in heating the gas. After heat exchange, it liquefies and flows out of the steam heat exchanger, returning to the working fluid storage tank through the liquid inlet pipe; the liquid working fluid in the working fluid storage tank can also enter the return air heat exchanger unit, where it absorbs heat from the return air and vaporizes, then flows into the ambient radiator for liquefaction, and finally flows back to the working fluid storage tank; the control system controls the start and stop of the solenoid valves and all electrical equipment in the device.

[0008] As a further technical improvement, the return air heat exchanger unit includes a movable heat exchanger and a fixed heat exchanger; the movable heat exchanger is movably arranged side-by-side with the fixed heat exchanger. The movable heat exchanger is movable; when the return air heat exchanger unit is not in use, the movable heat exchanger moves to be flush with the fixed heat exchanger, at which point the fins on the movable heat exchanger and the fixed heat exchanger are level, reducing the impact on the airflow in the return air duct; when the return air heat exchanger unit is in use, the movable heat exchanger moves slightly, so that the fins on the movable heat exchanger and the fins on the fixed heat exchanger are interlocked, increasing the contact area between the return air and the return air heat exchanger unit, resulting in higher operating efficiency of the return air heat exchanger unit; the low-boiling-point working fluid can be Freon.

[0009] As a further technical improvement, the bottom of the movable heat exchanger is provided with a movable base and a fixed base; the fixed base is provided with a slide rail; the movable base is movably fitted inside the slide rail; the fixed base is provided with an electric cylinder; the push rod of the electric cylinder is connected to the movable base; the inlet and outlet of both the movable and fixed heat exchangers are connected to a set of corrugated hoses; each set of corrugated hoses is connected to a heat exchange branch pipe; the corresponding heat exchange branch pipes on the movable and fixed heat exchangers are interconnected and converge to serve as the total inlet and outlet of the return air heat exchanger unit, which are then connected to the liquid outlet pipe and the ambient heat exchanger respectively. The electric cylinder can push the movable base to move, so that the movable heat exchanger is aligned or offset from the fixed heat exchanger, adjusting the wind speed of the return air pipe and the working efficiency of the return air heat exchanger unit; the corrugated hoses and heat exchange branch pipes together connect the inlet and outlet of the movable and fixed heat exchangers for unified entry and exit.

[0010] As a further technical improvement, a vacuum pump is also included; a vacuum pumping pipe is connected between the vacuum pump and the inlet of the steam heat exchanger; a vacuum solenoid valve is installed on the vacuum pumping pipe. The vacuum pump can evacuate the steam heat exchanger, extracting residual steam and facilitating the entry of liquid working fluid; the vacuum solenoid valve controls the opening and closing of the vacuum pumping pipe.

[0011] As a further technical improvement, the steam heat exchanger is connected to a steam outlet pipe and a steam inlet pipe; a steam outlet solenoid valve is installed on the steam outlet pipe; a steam inlet solenoid valve is installed on the steam inlet pipe. Both the steam outlet pipe and the steam inlet pipe are connected to the factory's steam pipeline network; the steam outlet solenoid valve and the steam inlet solenoid valve control the on / off state of the steam outlet pipe and the steam inlet pipe, respectively.

[0012] As a further technical improvement, a return air heat exchange inlet pipe is connected between the outlet of the working fluid storage tank and the inlet of the return air heat exchanger unit; a return air liquid solenoid valve is installed on the return air heat exchange inlet pipe; a return air heat exchange outlet pipe is connected between the outlet of the return air heat exchanger unit and the inlet of the ambient heat exchanger; a return air gas solenoid valve is installed on the return air heat exchange outlet pipe. The liquid working fluid enters the return air heat exchanger unit through the return air heat exchange inlet pipe; the return air liquid solenoid valve controls the opening and closing of the return air heat exchange inlet pipe; the gaseous working fluid enters the ambient heat exchanger from the return air heat exchanger unit through the return air heat exchange outlet pipe; the return air gas solenoid valve is used to control the opening and closing of the return air heat exchange outlet pipe.

[0013] As a further technical improvement, a low-temperature environment return pipe is provided between the outlet and the inlet pipe of the ambient heat exchanger; a low-temperature environment return solenoid valve is provided on the low-temperature environment return pipe; a high-temperature environment connecting pipe is also connected between the outlet of the ambient heat exchanger and the inlet of the steam heat exchanger; a high-temperature environment solenoid valve is provided on the high-temperature environment connecting pipe. The liquid working fluid in the ambient heat exchanger enters the inlet pipe through the low-temperature environment return pipe and finally enters the working fluid storage tank; the low-temperature environment return solenoid valve controls the opening and closing of the low-temperature environment return pipe; the gaseous working fluid enters the steam heat exchanger from the high-temperature environment connecting pipe; the high-temperature environment solenoid valve controls the opening and closing of the high-temperature environment connecting pipe.

[0014] As a further technical improvement, the outlet pipe is equipped with a low-boiling-point working fluid pump and an outlet solenoid valve; the inlet pipe is equipped with a storage solenoid valve; and the outlet pipe is equipped with a high-temperature environment outlet solenoid valve. The low-boiling-point working fluid pump is used to pump the liquid working fluid from the working fluid storage tank; the storage solenoid valve is used to control the opening and closing of the inlet pipe; and the high-temperature environment outlet solenoid valve is used to control the opening and closing of the outlet pipe.

[0015] As a further technical improvement, the fresh air section is connected to a fresh air duct; the fresh air section, the mixing air section, and the air outlet section are all equipped with inspection doors; a primary filter is provided between the fresh air section and the mixing air section; a surface cooler is provided in the surface cooler section; a fan is provided in the fan section; a medium-efficiency filter is provided in the air outlet section; and the air outlet section is connected to a supply air duct.

[0016] The above describes the usage method of the energy-saving modular air conditioner:

[0017] Hot Environment Use: When the outside temperature is high and cooling is required, the equipment evacuates air, and fresh air from the outside sequentially passes through the fresh air section, mixing section, surface cooling section, heating section, fan section, and outlet section. The steam outlet and steam inlet solenoid valves are closed, while the vacuum solenoid valve and vacuum pump are opened. A vacuum is created in the steam heat exchanger through the vacuum pipe, and once the set vacuum level is reached, the vacuum solenoid valve and vacuum pump are closed. The liquid storage solenoid valve, high-temperature environment liquid outlet solenoid valve, liquid outlet solenoid valve, and high-temperature environment solenoid valve are opened, the working fluid pump starts, and the liquid working fluid enters the environmental heat exchanger from the working fluid storage tank. After exchanging heat with the higher temperature of the outside air, the liquid working fluid... The gaseous working fluid is vaporized and enters the steam heat exchanger through the high-temperature environment connecting pipe. After passing through the surface cooling section, the air temperature and humidity are relatively low. When the air enters the heating section, it comes into contact with the steam heat exchanger. The gaseous working fluid in the steam heat exchanger exchanges heat with the cold air, rapidly liquefies upon contact with the cold air, and releases heat, causing the temperature of the low-temperature air to rise, thereby increasing the air humidity. This is equivalent to replacing the original function of the steam heat exchanger in heating and humidifying the low-temperature air with steam. Subsequently, the liquefied working fluid flows back to the working fluid storage tank from the inlet pipe, completing the cycle. Finally, the low-temperature air is discharged into the room sequentially from the fan section and the outlet section, which helps to lower the indoor temperature.

[0018] In cold environments: When the outside air is cold and humid, the indoor humidity is also high, resulting in high humidity in the incoming fresh air section. The indoor air is drawn back into the equipment through the mixing section, where it mixes with the fresh air from the fresh air section. The liquid storage solenoid valve, low-temperature environment return liquid solenoid valve, return air solenoid valve, liquid outlet solenoid valve, and return air liquid solenoid valve open, the working fluid pump starts, and the liquid working fluid flows out of the working fluid storage tank and enters the return air heat exchanger unit. In the return air heat exchanger unit, it exchanges heat with the return air, absorbing heat and lowering the temperature of the air passing through the mixing section, removing moisture and reducing the humidity of the air entering the room. Subsequently, the low-humidity return air mixes with the fresh air and then sequentially enters the surface cooling section, heating section, fan section, and air outlet section. The airflow is heated and finally blown into the room. At this time, the liquid working fluid absorbs heat and vaporizes, entering the environmental heat exchanger. The gaseous working fluid exchanges heat and releases heat in the environmental heat exchanger, then liquefies and flows back to the working fluid storage tank.

[0019] The technical solution of this invention has the following beneficial effects:

[0020] 1. By setting up an environmental heat exchanger, the liquid working fluid flowing out of the working fluid storage tank can exchange heat with the high temperature of the environment and vaporize, and be used to replace steam to heat the air, effectively saving the amount of steam used in the combined air conditioning system and saving energy.

[0021] 2. By setting up a return air heat exchanger unit, the present invention can absorb heat from the return air by exchanging heat between the liquid working fluid and the return air, thereby reducing the humidity of the return air through cooling and dehumidification. This helps to reduce the humidity of the overall airflow after mixing with the fresh air in the mixing section, thereby reducing the amount of ice water used for cooling and dehumidification and further saving energy.

[0022] 3. The environmental heat exchanger of the present invention can also liquefy the working fluid that has been vaporized after use in a cold environment, and finally return it to the working fluid storage tank, so that the working fluid can be well circulated.

[0023] 4. The movable heat exchanger of the present invention can be moved to change its relative position with the fixed heat exchanger, so that the flow of return air is not affected when the return air heat exchanger unit is not in use, and the contact area between the return air and the return air heat exchanger unit is increased when the return air heat exchanger unit is in use, thereby improving the efficiency of use. Attached Figure Description

[0024] Figure 1 This is a schematic diagram showing the piping and connections of the components of this device.

[0025] Figure 2 This is a schematic diagram of the structure of each part of the device.

[0026] Figure 3 This is a schematic diagram of the structure of a moving heat exchanger.

[0027] Attached label: 1-Fresh air section, 2-Mixed air section, 3-Cooler section, 4-Heating section, 5-Fan section, 6-Clean air section, 7-Fresh air duct, 8-Return air duct, 9-Inspection door, 10-Primary filter, 11-Cooler, 12-Steam heat exchanger, 13-Fan, 14-Medium efficiency filter, 15-Return air heat exchanger unit, 16-Mobile heat exchanger, 17-Fixed heat exchanger, 18-Ambient heat exchange chamber, 19-Ambient heat exchanger, 20-Working fluid storage tank, 21-Air supply duct, 22-Steam outlet pipe, 23-Steam inlet pipe, 24-Steam outlet solenoid valve, 25-Steam inlet solenoid valve, 26-Vacuum Pump, 27-vacuum pipe, 28-vacuum solenoid valve, 29-liquid inlet pipe, 30-liquid storage solenoid valve, 31-liquid outlet pipe, 32-high temperature environment liquid outlet solenoid valve, 33-working fluid pump, 34-liquid outlet solenoid valve, 35-low temperature environment return pipe, 36-low temperature environment return solenoid valve, 37-return air heat exchange outlet pipe, 38-return air solenoid valve, 39-return air heat exchange inlet pipe, 40-return air liquid solenoid valve, 41-push rod connecting movable base, 42-fixed base, 43-electric cylinder, 44-slide rail, 45-corrugated hose, 46-heat exchange branch pipe, 47-high temperature environment connecting pipe, 48-high temperature environment solenoid valve. Detailed Implementation

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Example 1:

[0030] like Figures 1-3 As shown, an energy-saving modular air conditioner includes a fresh air section 1, a mixing air section 2, a surface cooling section 3, a heating section 4, a fan section 5, and an air outlet section 6 connected in sequence; the mixing air section 2 is connected to a return air duct 8; the heating section 4 is equipped with a steam heat exchanger 12; it also includes an environmental heat exchange chamber 18, a working fluid storage tank 20, and a control system; a return air heat exchanger unit 15 is installed in the return air duct 8; an environmental heat exchanger 19 is installed in the environmental heat exchange chamber 18; the working fluid storage tank 20 is filled with a low-boiling-point working fluid; the inlet of the working fluid storage tank 20 is equipped with an inlet pipe 29. The outlet is equipped with a liquid outlet pipe 31; the liquid outlet pipe 31 is connected to the inlet of the ambient heat exchanger 19; the outlet of the ambient heat exchanger 19 is connected to the inlet of the steam heat exchanger 12 via a pipe; the outlet of the steam heat exchanger 12 is connected to the liquid inlet pipe 29 via a pipe; the liquid outlet pipe 31 is also connected to the inlet of the return air heat exchanger unit 15 via a pipe; the outlet of the return air heat exchanger unit 15 is connected to the inlet of the ambient heat exchanger 19 via a pipe; the outlet of the ambient heat exchanger 19 is also connected to the liquid inlet pipe 29 via a pipe; each pipe is equipped with a corresponding solenoid valve.

[0031] The return air heat exchanger unit 15 includes a movable heat exchanger 16 and a fixed heat exchanger 17; the movable heat exchanger 16 is movably arranged alongside the fixed heat exchanger 17.

[0032] The bottom of the movable heat exchanger 16 is provided with a movable base 41 and a fixed base 42; the fixed base 42 is provided with a slide rail 44; the movable base 41 is movably fitted inside the slide rail 44; the fixed base 42 is provided with an electric cylinder 43; the push rod of the electric cylinder 43 is connected to the movable base 41; the inlet and outlet of the movable heat exchanger 16 and the fixed heat exchanger 17 are each connected to a set of corrugated hoses 45; each set of corrugated hoses 45 is connected to a heat exchange branch pipe 46; the corresponding heat exchange branch pipes 46 on the movable heat exchanger 16 and the fixed heat exchanger 17 are interconnected and converge to serve as the total inlet and total outlet of the return air heat exchanger unit 15, which are then connected to the liquid outlet pipe 31 and the ambient heat exchanger 19 respectively.

[0033] A return air heat exchange inlet pipe 39 is connected between the outlet of the working fluid storage tank 20 and the inlet of the return air heat exchanger unit 15; a return air liquid solenoid valve 40 is provided on the return air heat exchange inlet pipe 39; a return air heat exchange outlet pipe 37 is connected between the outlet of the return air heat exchanger unit 15 and the inlet of the ambient heat exchanger 19; a return air gas solenoid valve 38 is provided on the return air heat exchange outlet pipe 37.

[0034] A low-temperature environment return pipe 35 is provided between the outlet of the ambient heat exchanger 19 and the inlet pipe 29; a low-temperature environment return solenoid valve 36 is provided on the low-temperature environment return pipe 35; a high-temperature environment connecting pipe 47 is also connected between the outlet of the ambient heat exchanger 19 and the inlet of the steam heat exchanger 12; a high-temperature environment solenoid valve 48 is provided on the high-temperature environment connecting pipe 47.

[0035] The liquid outlet pipe 31 is equipped with a low-boiling-point working fluid pump 33 and a liquid outlet solenoid valve 34; the liquid inlet pipe 29 is equipped with a liquid storage solenoid valve 30; and the liquid outlet pipe 31 is equipped with a high-temperature environment liquid outlet solenoid valve 32.

[0036] The fresh air section 1 is connected to a fresh air duct 7; the fresh air section 1, the mixing air section 2, and the air outlet section 6 are all equipped with inspection doors 9; a primary filter 10 is provided between the fresh air section 1 and the mixing air section 2; a surface cooler 11 is provided in the surface cooler section 3; a fan 13 is provided in the fan section 5; a medium-efficiency filter 14 is provided in the air outlet section 6; and an air supply duct 21 is connected to the air outlet section 6.

[0037] The method of using this invention is as follows:

[0038] Hot Environment Use: When the outside temperature is high and cooling is required, the equipment evacuates air, and fresh air from the outside passes through the fresh air section 1, mixing section 2, surface cooling section 3, heating section 4, fan section 5, and outlet section 6 in sequence. The steam outlet solenoid valve 24 and steam inlet solenoid valve 25 are closed, while the vacuum solenoid valve 28 and vacuum pump 26 are opened. Vacuum is drawn through the vacuum pipe 27 to the steam heat exchanger 12. Once the set vacuum level is reached, the vacuum solenoid valve 28 and vacuum pump 26 are closed. The liquid storage solenoid valve 30, high-temperature environment liquid outlet solenoid valve 32, liquid outlet solenoid valve 34, and high-temperature environment solenoid valve 48 are opened, and the working fluid pump 33 starts. Liquid working fluid enters the environmental heat exchanger 19 from the working fluid storage tank 20, where it is mixed with the outside air. After high-temperature heat exchange, the liquid working fluid vaporizes and enters the steam heat exchanger 12 through the high-temperature environment connecting pipe 47. The air temperature and humidity are low after passing through the surface cooling section 3. When the air enters the heating section 4, it comes into contact with the steam heat exchanger 12. The gaseous working fluid in the steam heat exchanger 12 exchanges heat with the cold air, liquefies rapidly upon cooling, and releases heat, causing the temperature of the low-temperature air to rise, thereby increasing the air humidity. This is equivalent to replacing the original function of the steam heat exchanger 12 in heating and humidifying the low-temperature air through steam. Subsequently, the liquefied working fluid flows back to the working fluid storage tank 20 from the liquid inlet pipe 29, completing the cycle. Finally, the low-temperature air is discharged into the room sequentially from the fan section 5 and the air outlet section 6, which helps to reduce the indoor temperature.

[0039] Cold Environment Use: When the outside air is cold and humid, the indoor humidity is also high, resulting in high humidity in the incoming fresh air section 1. The indoor air is then drawn back into the equipment through the mixing section 2, where it mixes with the fresh air from the fresh air section 1. The liquid storage solenoid valve 30, the low-temperature environment return liquid solenoid valve 36, the return air solenoid valve 38, the liquid outlet solenoid valve 34, and the return air liquid solenoid valve 40 are opened, the working fluid pump 33 starts, and the liquid working fluid flows out from the working fluid storage tank 20 and enters the return air heat exchanger unit 15 for heat exchange. The unit 15 exchanges heat with the return air, absorbing heat and reducing the temperature of the air passing through the mixing section 2, thus removing moisture and reducing the humidity of the air entering the room. Then, the low-humidity return air mixes with the fresh air and is then sequentially introduced into the cooling section 3, heating section 4, fan section 5, and air outlet section 6. The airflow is heated and finally blown into the room. At this time, the liquid working fluid absorbs heat and vaporizes, and enters the ambient heat exchanger 19. The gaseous working fluid exchanges heat and releases heat in the ambient heat exchanger 19, then liquefies and flows back to the working fluid storage tank 20.

[0040] Example 2:

[0041] The difference between this embodiment and Embodiment 1 is that it also includes a vacuum pump 26; a vacuum pump 27 is connected between the vacuum pump 26 and the inlet of the steam heat exchanger 12; and a vacuum solenoid valve 28 is provided on the vacuum pump 27.

[0042] The usage method of this embodiment is the same as that of Embodiment 1.

[0043] Example 3:

[0044] The difference between this embodiment and embodiment two is that: the steam heat exchanger 12 is connected to a steam outlet pipe 22 and a steam inlet pipe 23; a steam outlet solenoid valve 24 is provided on the steam outlet pipe 22; and a steam inlet solenoid valve 25 is provided on the steam inlet pipe 23.

[0045] The usage method of this embodiment is the same as that of Embodiment 1.

[0046] Example 4:

[0047] The difference between this embodiment and Embodiment 3 is that it also includes a vacuum pump 26; a vacuum pump 27 is connected between the vacuum pump 26 and the inlet of the steam heat exchanger 12; a vacuum solenoid valve 28 is provided on the vacuum pump 27. The steam heat exchanger 12 is connected to a steam outlet pipe 22 and a steam inlet pipe 23; a steam outlet solenoid valve 24 is provided on the steam outlet pipe 22; and a steam inlet solenoid valve 25 is provided on the steam inlet pipe 23.

[0048] The usage method of this embodiment is the same as that of Embodiment 1.

[0049] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

[0050] In the description of this invention, it should be noted that the terms "inner", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0051] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. An energy-saving modular air conditioner, comprising a fresh air section (1), a mixing air section (2), a surface cooling section (3), a heating section (4), a fan section (5), and an air outlet section (6) connected in sequence; the mixing air section (2) is connected to a return air duct (8); the heating section (4) is provided with a steam heat exchanger (12); characterized in that: It also includes an environmental heat exchange chamber (18), a working fluid storage tank (20) and a control system; a return air heat exchanger unit (15) is installed in the return air duct (8); an environmental heat exchanger (19) is installed in the environmental heat exchange chamber (18); and a low-boiling-point working fluid is installed in the working fluid storage tank (20). The working fluid storage tank (20) has an inlet pipe (29) at its inlet and an outlet pipe (31) at its outlet; the outlet pipe (31) is connected to the inlet of the ambient heat exchanger (19); the outlet of the ambient heat exchanger (19) is connected to the inlet of the steam heat exchanger (12) through a pipe; the outlet of the steam heat exchanger (12) is connected to the inlet pipe (29) through a pipe. The liquid outlet pipe (31) is also connected to the inlet of the return air heat exchanger unit (15) via a pipe; the outlet of the return air heat exchanger unit (15) is connected to the inlet of the ambient heat exchanger (19) via a pipe; the outlet of the ambient heat exchanger (19) is also connected to the liquid inlet pipe (29) via a pipe. Each pipeline is equipped with a corresponding solenoid valve.

2. The energy-saving combined air conditioner according to claim 1, characterized in that: The return air heat exchanger unit (15) includes a movable heat exchanger (16) and a fixed heat exchanger (17); the movable heat exchanger (16) is movably arranged in parallel with the fixed heat exchanger (17).

3. The energy-saving combined air conditioner according to claim 2, characterized in that: The bottom of the movable heat exchanger (16) is provided with a movable base (41) and a fixed base (42); the fixed base (42) is provided with a slide rail (44); the movable base (41) is movably fitted in the slide rail (44); the fixed base (42) is provided with an electric cylinder (43); the push rod of the electric cylinder (43) is connected to the movable base (41); the inlet and outlet of the movable heat exchanger (16) and the fixed heat exchanger (17) are respectively connected to a set of corrugated hoses (45); each set of corrugated hoses (45) is connected to a heat exchange branch pipe (46); the corresponding heat exchange branch pipes (46) on the movable heat exchanger (16) and the fixed heat exchanger (17) are connected to each other and converge to serve as the total inlet and total outlet of the return air heat exchanger unit (15), which are then connected to the liquid outlet pipe (31) and the ambient heat exchanger (19) respectively.

4. The energy-saving combined air conditioner according to claim 1, characterized in that: It also includes a vacuum pump (26); a vacuum pump (26) is connected to the inlet of the steam heat exchanger (12) via a vacuum pipe (27); a vacuum solenoid valve (28) is provided on the vacuum pipe (27).

5. The energy-saving combined air conditioner according to claim 1, characterized in that: The steam heat exchanger (12) is connected to a steam outlet pipe (22) and a steam inlet pipe (23); a steam outlet solenoid valve (24) is provided on the steam outlet pipe (22); and a steam inlet solenoid valve (25) is provided on the steam inlet pipe (23).

6. The energy-saving combined air conditioner according to claim 1, characterized in that: A return air heat exchange inlet pipe (39) is connected between the outlet of the working fluid storage tank (20) and the inlet of the return air heat exchanger unit (15); a return air liquid solenoid valve (40) is provided on the return air heat exchange inlet pipe (39); a return air heat exchange outlet pipe (37) is connected between the outlet of the return air heat exchanger unit (15) and the inlet of the ambient heat exchanger (19); a return air gas solenoid valve (38) is provided on the return air heat exchange outlet pipe (37).

7. The energy-saving combined air conditioner according to claim 1, characterized in that: A low-temperature environment return pipe (35) is provided between the outlet of the environmental heat exchanger (19) and the inlet pipe (29); a low-temperature environment return solenoid valve (36) is provided on the low-temperature environment return pipe (35); a high-temperature environment connecting pipe (47) is also connected between the outlet of the environmental heat exchanger (19) and the inlet of the steam heat exchanger (12); a high-temperature environment solenoid valve (48) is provided on the high-temperature environment connecting pipe (47).

8. The energy-saving combined air conditioner according to claim 1, characterized in that: The liquid outlet pipe (31) is equipped with a low-boiling-point working fluid pump (33) and a liquid outlet solenoid valve (34); the liquid inlet pipe (29) is equipped with a liquid storage solenoid valve (30); and the liquid outlet pipe (31) is equipped with a high-temperature environment liquid outlet solenoid valve (32).

9. The energy-saving combined air conditioner according to claim 1, characterized in that: The fresh air section (1) is connected to a fresh air duct (7); the fresh air section (1), the mixing air section (2) and the air outlet section (6) are all equipped with inspection doors (9); a primary filter (10) is provided between the fresh air section (1) and the mixing air section (2); a surface cooler (11) is provided in the surface cooler section (3); a fan (13) is provided in the fan section (5); a medium-efficiency filter (14) is provided in the air outlet section (6); and an air supply duct (21) is connected to the air outlet section (6).

10. The method of using the energy-saving combined air conditioner according to any one of claims 1 to 9, characterized in that, Includes the following steps: 1) Hot Environment Use: When the outside temperature is high and cooling is required, the equipment evacuates air. Fresh air from the outside passes through the fresh air section (1), mixing section (2), surface cooling section (3), heating section (4), fan section (5), and air outlet section (6) in sequence. The steam outlet solenoid valve (24) and steam inlet solenoid valve (25) are closed, and the vacuum solenoid valve (28) and vacuum pump (26) are opened. The steam heat exchanger (12) is evacuated through the vacuum pipe (27). After the set vacuum degree is reached, the vacuum solenoid valve (28) and vacuum pump (26) are closed. The liquid storage solenoid valve (30), high temperature environment liquid outlet solenoid valve (32), liquid outlet solenoid valve (34), and high temperature environment solenoid valve (48) are opened, and the working fluid pump (33) is started. The liquid working fluid enters the environmental heat exchanger from the working fluid storage tank (20). (19) After exchanging heat with the outside air at a higher temperature, the liquid working fluid vaporizes and enters the steam heat exchanger (12) from the high-temperature environment connecting pipe (47). The air temperature and humidity are low after passing through the surface cooling section (3). When the air enters the heating section (4) and comes into contact with the steam heat exchanger (12), the gaseous working fluid in the steam heat exchanger (12) exchanges heat with the cold air and quickly liquefies upon encountering cold, releasing heat and causing the low-temperature air temperature to rise, thereby increasing the air humidity. This is equivalent to replacing the original function of the steam heat exchanger (12) in raising and humidifying the low-temperature air through steam. Subsequently, the liquefied working fluid flows back to the working fluid storage tank (20) from the liquid inlet pipe (29) to complete the cycle. Finally, the low-temperature air is discharged into the room from the fan section (5) and the air outlet section (6) in sequence, which plays a role in reducing the indoor temperature. 2) Cold Environment Use: When the outside air is cold and humid, the indoor humidity is also high, and the air entering the fresh air section (1) has high humidity; the indoor air is drawn back to the equipment through the mixing section (2) and mixed with the fresh air from the fresh air section (1) in the mixing section (2); the liquid storage solenoid valve (30), the low temperature environment return liquid solenoid valve (36), the return air solenoid valve (38), the liquid outlet solenoid valve (34), and the return air liquid solenoid valve (40) are opened, the working fluid pump (33) is started, and the liquid working fluid flows out from the working fluid storage tank (20) and enters the return air heat exchanger unit (15), in The return air heat exchanger unit (15) exchanges heat with the return air and absorbs heat, which reduces the temperature of the air passing through the mixing section (2) and removes moisture, thereby reducing the humidity of the air entering the room. Then, the low humidity return air is mixed with the fresh air and then sequentially passed through the surface cooling section (3), heating section (4), fan section (5) and air outlet section (6). The airflow is heated and finally blown into the room. At this time, the liquid working fluid absorbs heat and vaporizes, and enters the environmental heat exchanger (19). The gaseous working fluid exchanges heat and releases heat in the environmental heat exchanger (19) and then liquefies, and flows back to the working fluid storage tank (20).

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