Fresh air system

Abstract

The invention discloses a fresh air system. The fresh air system comprises an air inlet channel and an air exhaust channel which are independent from each other. Wherein the air inlet channel comprises a dehumidification reheating section located between a fresh air inlet and a fresh air outlet, and the dehumidification reheating section comprises a first water surface cooler, a dehumidification evaporator and a second water surface cooler which are sequentially arranged in the air flow direction; the exhaust channel comprises an exhaust condensation section located between an exhaust inlet and an exhaust outlet, and the exhaust condensation section comprises a third water surface cooler. And condensation heat generated in the dehumidification process enters the second water surface air cooler and / or the third water surface air cooler, the second water surface air cooler is used for heating fresh air passing through the dehumidification evaporator again, and the third water surface air cooler is used for heating air in the air exhaust channel and exhausting the heated air outdoors through the air exhaust outlet. Condensation waste heat in the fresh air system can be reasonably recycled, and the system safety and the heat recovery efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of building heating and ventilation, and in particular to a fresh air system. Background Art

[0002] The fresh air system is an independent air treatment system consisting of an air supply system and an exhaust system, which can circulate indoor air. On the one hand, it discharges the dirty air indoors to the outside, and on the other hand, it inputs the fresh air outdoors into the room after filtering, dehumidification / humidification, heating / cooling, etc., so that the room can obtain fresh and clean air at a suitable temperature. As the core component of the independent indoor temperature and humidity control system, the fresh air fan not only has the function of providing fresh and clean air indoors, but also has the function of ensuring indoor humidity, which is very critical to the temperature and humidity regulation effect of the radiation air conditioner.

[0003] At present, the fresh air fan generally uses the compressor condensation heat generated by deep dehumidification for reheating during refrigeration and dehumidification. Since dehumidification control requires throttle valve control, if a throttle valve is added to control the reheating temperature, it will affect the dehumidification capacity of the system regardless of whether it is connected in parallel or in series. Multiple sensors need to be added and the control logic is very complex, which is prone to failure in actual operation. In view of this, it is necessary to provide a fresh air fan that is both safe and heat recovery efficient. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a fresh air system that can utilize condensation heat to achieve recovery of condensation waste heat in the fresh air system, thereby improving system safety and heat recovery efficiency.

[0005] Based on the above technical problems, the present invention provides the following technical solutions:

[0006] A fresh air system comprises an air inlet channel and an exhaust channel which are independent of each other; the air inlet channel comprises a dehumidification and reheating section located between the fresh air inlet and the fresh air outlet, the dehumidification and reheating section comprises a first water meter cooler, a dehumidification evaporator and a second water meter cooler which are arranged in sequence along the wind flow direction; the exhaust channel comprises an exhaust condensation section located between the exhaust inlet and the exhaust outlet, the exhaust condensation section comprises a third water meter cooler; the condensation heat generated during the dehumidification process enters the second water meter cooler and / or the third water meter cooler, the second water meter cooler is used to reheat the fresh air after passing through the dehumidification evaporator, the third water meter cooler is used to heat the air in the exhaust channel, and discharge the heated air to the outdoors through the exhaust outlet.

[0007] Specifically, in some embodiments of the present invention, the exhaust channel is also provided with a waste heat recovery section, and the waste heat recovery section includes a first heat exchanger, the first heat exchanger is a fluorine water plate exchanger, the water passage of the first heat exchanger is used to absorb the condensation heat during the dehumidification process, and the water outlet of the first heat exchanger is connected to the second water meter cooler and the third water meter cooler through a distribution valve.

[0008] Specifically, in some embodiments of the present invention, the waste heat recovery section further includes a dehumidification compressor, and the dehumidification compressor, the first heat exchanger, the throttle valve and the dehumidification evaporator are sequentially connected to form a dehumidification refrigeration system.

[0009] Specifically, in some embodiments of the present invention, the air inlet channel also includes a fresh air filtering section arranged between the fresh air inlet and the dehumidification and reheating section, and the fresh air filtering section includes a first filter and a second filter arranged in sequence along the direction of the air flow.

[0010] Specifically, in some embodiments of the present invention, the air inlet channel also includes a fresh air humidification section arranged between the dehumidification and reheating section and the fresh air outlet, and the fresh air humidification section includes a humidification membrane; the exhaust channel also includes a humidification water tank arranged between the exhaust condensation section and the exhaust outlet, and the humidification water tank is connected to the humidification membrane.

[0011] Specifically, in some embodiments of the present invention, the exhaust passage further includes an exhaust filter section disposed between the exhaust inlet and the exhaust condensation section, the exhaust filter section includes a third filter, and the exhaust inlet is provided with an air valve.

[0012] Specifically, in some embodiments of the present invention, the air inlet channel also includes an air supply section, the fresh air outlet is located in the air supply section, and the air supply section is provided with an air supply fan, and the exhaust channel also includes an exhaust section, the exhaust outlet is located in the exhaust section, and the exhaust section is provided with an exhaust fan.

[0013] Specifically, some embodiments of the present invention further include a control unit, which controls the distribution valve according to the indoor temperature to adjust the water flow entering the second water meter cooler and the third water meter cooler, thereby controlling the outlet air temperature of the fresh air outlet.

[0014] Specifically, in some embodiments of the present invention, a heating device is further provided in the air supply section of the air inlet channel.

[0015] Specifically, in some embodiments of the present invention, the control unit is also used to control the on / off of the heating device according to the indoor temperature and the temperature difference between the fresh air outlet side temperature and the indoor temperature.

[0016] The above technical solution has the following beneficial effects:

[0017] In the fresh air system provided by the present invention, a first water meter cooler, a dehumidification evaporator and a second water meter cooler are sequentially arranged in the dehumidification and reheating section in the air inlet channel, and a third water meter cooler is arranged in the exhaust condensation section of the exhaust channel. The condensation heat generated in the dehumidification process can be dissipated through the second water meter cooler and the third water meter cooler, and can be used to reheat the fresh air after dehumidification and supercooling, thereby realizing the waste heat recovery of the condensation heat. The waste heat recovery is achieved by water circulation. During the whole process, the fresh air and exhaust air are independent of each other, and cross-contamination between the fresh air and exhaust air will not occur, thereby improving the system safety and heat recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0019] Figure 1 A schematic structural diagram of a specific implementation scheme of the fresh air system provided by the present invention. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] like Figure 1 As shown, a specific embodiment of the fresh air system provided by the present invention includes a fresh air machine housing 100, and the fresh air machine housing 100 has an air inlet channel 10 and an air exhaust channel 20 that are independent of each other. The air inlet channel 10 is used to filter the outdoor air and adjust the temperature and humidity to send suitable fresh air into the room, and the air exhaust channel 20 is used to collect the indoor air and discharge it to the outside after filtering and other treatments. The exhaust channel 20 and the air inlet channel 10 are independent of each other, and the air is relatively sealed, but some heat exchange devices inside the air inlet channel 10 and the exhaust channel 20 can be connected to each other for more reasonable heat utilization.

[0022] Among them, the air inlet channel 10 is constructed in the form of a channel extending along the first direction, and the two ends of the air inlet channel 10 are respectively provided with a fresh air inlet 10a connected to the outdoors and a fresh air outlet 10b connected to the indoors. The air inlet channel 10 includes a dehumidification and reheating section 11, and the dehumidification and reheating section 11 includes a first water meter cooler 111, a dehumidification evaporator 112 and a second water meter cooler 113 arranged in sequence along the wind flow direction; the first water meter cooler 111 changes the temperature of the fresh air flowing through by adjusting the water temperature of the internal water, the dehumidification evaporator 112 is used to dehumidify the fresh air to reduce the humidity of the fresh air, and the second water meter cooler 113 is used to absorb the condensation heat generated during the dehumidification process and reheat the fresh air that has been significantly cooled after waste heat recovery and dehumidification, so that the fresh air can reach a preset temperature and enter the room.

[0023] The exhaust passage 20 is also constructed in the form of a passage extending along the first direction. An exhaust inlet 20a connected to the indoor and an exhaust outlet 20b connected to the outdoor are respectively arranged at both ends of the exhaust passage 20. The exhaust passage 20 includes an exhaust condensation section 21, and the exhaust condensation section 21 includes a third water meter cooler 211; the third water meter cooler 211 is used to absorb the condensation heat generated during the dehumidification process, heat the air in the exhaust passage 20, and discharge the heated air to the outdoors through the exhaust outlet 20b.

[0024] In the above-mentioned fresh air system, the condensation heat generated during the dehumidification process can be absorbed by the second water meter cooler 113 and the third water meter cooler 211. The second water meter cooler 113 heats the dehumidified and supercooled fresh air again, and the remaining condensation heat heats the air in the exhaust duct 20 through the third water meter cooler 211, thereby realizing the waste heat recovery of the condensation heat. The waste heat recovery is achieved by water circulation. During the whole process, the fresh air and the exhaust air are independent of each other, and there will be no cross-contamination between the fresh air and the exhaust air, thereby improving the system safety and heat recovery efficiency.

[0025] In an optional embodiment, the exhaust passage is further provided with a waste heat recovery section 23, and the waste heat recovery section 23 includes a dehumidification compressor 231 and a first heat exchanger 232, wherein the first heat exchanger 232 is a fluorine water plate exchanger, and the water passage of the first heat exchanger 232 is used to absorb the condensation heat during the dehumidification process, and the water outlet of the first heat exchanger 232 is connected to the second water meter cooler 113 and the third water meter cooler 211 through a distribution valve. More specifically, the dehumidification compressor 231, the first heat exchanger 232, the throttle valve and the dehumidification evaporator 112 are connected in sequence to form a dehumidification refrigeration system. When fresh air dehumidification is performed, the first heat exchanger 232 is used as a condenser. During the dehumidification process, the water passage of the first heat exchanger 232 absorbs the condensation heat generated by the fluorine passage, and the heated hot water is introduced into the second water meter cooler 113 and the third water meter cooler 211 through the distribution valve in sequence, thereby realizing the waste heat recovery of the condensation heat.

[0026] The above-mentioned fresh air system also includes a control unit. In one case, when the indoor temperature is lower than the first threshold, the control unit controls the distribution valve to make the condensed hot water of the above-mentioned first heat exchanger 232 completely enter the second water meter cooler 113, so that the temperature of the fresh air after passing through the second water meter cooler 113 is increased to form a hotter fresh air outlet temperature. When the indoor temperature is higher than the second threshold, the control unit controls the distribution valve to make part of the condensed hot water of the first heat exchanger 232 enter the second water meter cooler 113, so that the temperature of the fresh air after passing through the second water meter cooler 113 is slightly increased to form a lower fresh air outlet temperature, and the remaining part of the condensed hot water of the first heat exchanger 232 enters the third water meter cooler 211 on the exhaust channel 20 side, and through heat exchange with the air on the exhaust channel 20 side, the generated hot air is discharged through the exhaust outlet 20b.

[0027] It can be understood that the indoor temperature is obtained by a temperature sensor arranged indoors and away from the fresh air outlet 10b and the exhaust air inlet 20a, and the temperature sensor is connected to a control unit so as to control the fresh air system according to the indoor temperature conditions.

[0028] Specifically, in an optional embodiment, the air inlet channel 10 includes a fresh air filter section 12 disposed between the fresh air inlet 10a and the dehumidification and reheating section 11, and the fresh air filter section 12 includes a first filter 121 and a second filter 122 disposed sequentially along the direction of the wind flow. A wind valve is disposed on the fresh air inlet 10a to achieve regulation of the rate at which fresh air enters the air inlet channel 10, and the outdoor fresh air flows through the first filter 121 and the second filter 122 in sequence, the first filter 121 is used to preliminarily filter impurities in the fresh air to purify the fresh air, and the second filter 122 is used to further filter harmful gases in the fresh air. It is understandable that the fresh air filter section 12 can also be provided with one or more groups of filtering devices, for example, an electrostatic adsorption device for removing static electricity in the fresh air can also be provided.

[0029] In an optional embodiment, the air inlet channel 10 further includes a fresh air humidification section 13 disposed between the dehumidification and reheating section 11 and the fresh air outlet 10b, and the fresh air humidification section 13 includes a humidification membrane 131. The exhaust channel 20 is further provided with a humidification water tank 231 connected to the humidification membrane 131, and the humidification water tank 231 is located between the exhaust air condensation section 21 and the exhaust air outlet 20b. The fresh air humidification section 13 is used to increase the humidity of the fresh air, and the humidification water tank 231 is connected to the humidification membrane 131 of the fresh air humidification section 13 to provide the moisture required for humidification.

[0030] In an optional embodiment, the air inlet channel 10 also includes an air supply section 14, the fresh air outlet 10b is located in the air supply section 14, and the air supply section 14 is provided with an air blower 141. By controlling the air blower 141, fresh air with a more suitable temperature and humidity is delivered into the room along the fresh air outlet 10b.

[0031] The air supply section 14 is also provided with a heating device 142, which is used to supplement the heat of the fresh air so that the fresh air after rapid heating is discharged into the room along the fresh air outlet 10b. In an optional embodiment, a temperature sensor is provided on the side of the fresh air outlet 10b to detect the fresh air outlet temperature, and the control unit is also used to control the opening and closing of the heating device 142 according to the indoor temperature value and the temperature difference between the temperature on the side of the fresh air outlet 10b and the indoor temperature. Specifically, when the indoor temperature is lower than the first threshold, the control unit controls the distribution valve to make the condensed hot water of the dehumidification evaporator 112 completely enter the second water meter cooler 113. After the first preset time, when the indoor temperature is lower than the second threshold, and the difference between the temperature on the side of the fresh air outlet 10b and the indoor temperature is less than the third threshold, the heating device 142 is controlled to be turned on, wherein the second threshold is greater than the first threshold. The above control method can be used to supplement the heat of the fresh air through the heating device 142 when the reheating temperature of the second water meter cooler 113 does not meet the room temperature requirements, so that the room temperature can be increased as soon as possible.

[0032] In an optional embodiment, the exhaust passage 20 further includes an exhaust filter section 22 disposed between the exhaust inlet 20a and the exhaust condensation section 21, the exhaust inlet 20a is provided with an air valve, the exhaust filter section 22 includes a third filter 221, the air valve is used to adjust the flow of indoor return air entering the exhaust passage 20, the indoor return air is filtered through the exhaust filter section 22, and then actively guided to the outdoors through the exhaust section 24. Specifically, the exhaust section 24 is provided with an exhaust fan 241, and the exhaust air is sent to the outdoors through the exhaust outlet 20b by controlling the exhaust fan 241.

[0033] In an optional embodiment, the air inlet channel 10 is located above the exhaust channel 20, wherein the fresh air filter section 12 is located above the exhaust air filter section 22, the dehumidification and reheating section 11 is located above the waste heat recovery section 23, the fresh air humidification section 13 is located above the humidification water tank 231, and the air supply section 14 where the blower 141 is located is located above the exhaust section 24 where the exhaust fan 241 is located. The above arrangement enables the air inlet channel 10 and the exhaust channel 20 to have a compact structure. For example, the humidification water tank 231 section is arranged in the exhaust channel 20, so that the number of functional sections of the air inlet channel 10 is substantially the same as that of the exhaust channel 20. At the same time, the internal components that are interconnected are arranged in an adjacent state, for example, the humidification water tank 231 and the fresh air humidification section 13, and the dehumidification and reheating section 11 and the waste heat recovery section 23 are respectively arranged in an adjacent state, which facilitates the installation and fixation of the pipelines and reduces the difficulty of installation and maintenance of the fresh air system.

[0034] In the fresh air system of the above technical solution, in the season when the fresh air needs to be dehumidified, the outdoor fresh air is introduced into the air inlet 10 of the fresh air machine housing 100 from the fresh air inlet 10a with the air valve, and the fresh air flows through the fresh air filter section 12, the dehumidification reheating section 11 and the air supply section 14 in sequence. Specifically, after the fresh air flows through the first filter 121 and the second filter 122 for purification, it passes through the first water cooler 111, and the low-temperature water in the first water cooler 111 is used to further cool the fresh air, and then the fresh air is cooled and dehumidified to the target humidity through the dehumidification evaporator 112, and the condensation heat generated by the refrigeration and dehumidification is used to heat the fresh air to the target air supply temperature through the second water cooler 113, and finally the fresh air is driven by the air supply fan 141 to be sent to the room from the air supply port. If the second water cooler 113 absorbs all the condensation heat and still cannot heat the fresh air to the target air supply temperature, the heating device 142 is started to quickly heat the fresh air. The indoor return air is sucked into the exhaust duct 20 in the fresh air machine case 100 along the exhaust inlet 20a with an air valve. After being purified by the third filter 221, the return air passes through the third water meter cooler 211 to take away the excess condensation heat generated by refrigeration and dehumidification, and is finally sent out of the fresh air machine case 100 to the outdoors from the exhaust outlet 20b through the exhaust fan 241.

[0035] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. A fresh air system, characterized in that: Includes independent air inlet and exhaust channels; The air inlet passage includes a dehumidification and reheating section located between the fresh air inlet and the fresh air outlet, and the dehumidification and reheating section includes a first water meter cooler, a dehumidification evaporator and a second water meter cooler arranged in sequence along the air flow direction; The exhaust passage includes an exhaust condensation section between the exhaust inlet and the exhaust outlet, and the exhaust condensation section includes a third water meter cooler; The condensation heat generated during the dehumidification process enters the second water meter cooler and / or the third water meter cooler. The second water meter cooler is used to reheat the fresh air after passing through the dehumidification evaporator. The third water meter cooler is used to heat the air in the exhaust channel and discharge the heated air to the outside through the exhaust outlet.

2. The fresh air system according to claim 1, characterized in that: The exhaust channel is also provided with a waste heat recovery section, which includes a first heat exchanger, which is a fluorine-water plate exchanger. The water passage of the first heat exchanger is used to absorb condensation heat during the dehumidification process. The water outlet of the first heat exchanger is connected to the second water meter cooler and the third water meter cooler through a distribution valve.

3. The fresh air system according to claim 2, characterized in that: The waste heat recovery section also includes a dehumidification compressor. The dehumidification compressor, the first heat exchanger, the throttle valve and the dehumidification evaporator are connected in sequence to form a dehumidification refrigeration system.

4. The fresh air system according to claim 1, characterized in that: The air inlet channel also includes a fresh air filtering section arranged between the fresh air inlet and the dehumidification and reheating section, and the fresh air filtering section includes a first filter and a second filter arranged in sequence along the direction of the air flow.

5. The fresh air system according to claim 1, characterized in that: The air inlet channel also includes a fresh air humidification section arranged between the dehumidification and reheating section and the fresh air outlet, and the fresh air humidification section includes a humidification membrane. The exhaust channel also includes a humidification water tank arranged between the exhaust condensation section and the exhaust outlet, and the humidification water tank is connected to the humidification membrane.

6. The fresh air system according to claim 1, characterized in that: The exhaust passage also includes an exhaust filter section arranged between the exhaust inlet and the exhaust condensation section, the exhaust filter section includes a third filter, and the exhaust inlet is provided with an air valve.

7. The fresh air system according to claim 1, characterized in that: The air inlet channel also includes an air supply section, the fresh air outlet is located in the air supply section, and the air supply section is provided with an air supply fan. The air exhaust channel also includes an exhaust section, the exhaust outlet is located in the exhaust section, and the exhaust section is provided with an exhaust fan.

8. The fresh air system according to claim 1, characterized in that: It also includes a control unit, which controls the distribution valve according to the indoor temperature to adjust the water flow entering the second water meter cooler and the third water meter cooler, thereby controlling the air outlet temperature of the fresh air outlet.

9. The fresh air system according to claim 8, characterized in that: The air supply section of the air inlet channel is also provided with a heating device.

10. The fresh air system according to claim 9, characterized in that: The control unit is also used to control the on / off of the heating device according to the indoor temperature and the temperature difference between the fresh air outlet side temperature and the indoor temperature.

Images