CN217031464U

CN217031464U - Fresh air dehumidifier and radiation air conditioning system

Info

Publication number: CN217031464U
Application number: CN202220909248.XU
Authority: CN
Inventors: 赵峰; 谭庆收
Original assignee: Beijing Bosui Technology Co ltd
Current assignee: Beijing Bosui Technology Co ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-07-22
Anticipated expiration: 2032-04-19

Abstract

The utility model discloses a fresh air dehumidifier and a radiation air conditioning system, wherein the fresh air dehumidifier comprises a total heat recoverer, a blower, an exhaust fan, a precooling coil pipe, a compressor, an evaporator, a main condenser and a secondary condenser which are arranged in a box body, wherein the compressor, the evaporator, the main condenser and the secondary condenser form a refrigeration cycle; the fresh air inlet, the first heat exchange channel of the total heat recoverer, the blower and the air supply outlet are sequentially arranged to form an air supply path, and the return air inlet, the second heat exchange channel of the total heat recoverer, the exhaust fan and the exhaust outlet are sequentially arranged to form an exhaust path; the compressor, the precooling coil, the evaporator and the main condenser are sequentially arranged between the total heat recoverer and the blower on the air supply path; the air conditioner has two-stage dehumidification function configuration, the refrigeration cycle is provided with two condensers, and the secondary condenser is arranged between the total heat recoverer and the exhaust fan on the exhaust path, so that the energy utilization rate of the equipment can be effectively improved, and the technical guarantee is provided for the reliability of the radiation air conditioning system under different application scenes.

Description

Fresh air dehumidifier and radiation air conditioning system

Technical Field

The utility model relates to the technical field of radiation air-conditioning systems, in particular to a fresh air dehumidifier and a radiation air-conditioning system.

Background

Along with improvement of people on indoor environment health cognition, the engineering of the radiation air-conditioning system is widely applied, and the specific application field comprises the fields of tools and home decoration. The existing radiation air-conditioning system takes a radiation plate as a tail end heat exchange device and does not have dehumidification capacity. In order to create a comfortable and healthy green environment indoors, fresh air or air-conditioning mixed air with dehumidification capacity needs to be sent indoors, and the fresh air or the air-conditioning mixed air and the air-conditioning mixed air form a complete penta-constant (constant temperature, constant humidity, constant oxygen, constant cleanness and constant static) radiation air-conditioning system.

At present, the existing fresh air dehumidification products mainly have three applications: 1) as equipment for dehumidifying ordinary indoor rooms (mainly used for dehumidifying southern basements), and meanwhile, removing indoor musty smell; 2) the air conditioner is the most important equipment product of the independent temperature and humidity control air conditioning system, and is mainly used for controlling the indoor humidity to be constant in a certain range; 3) the dehumidifying and cooling device is used as dehumidifying and cooling equipment of high-performance buildings to dehumidify and cool air sent into rooms. However, due to the limitation of the self structure principle, the problem of insufficient precooling and dehumidifying capacity exists, and the method can be particularly applied to northern areas in China in engineering practice, but cannot be effectively applied to southern areas with high temperature and high humidity.

In view of this, it is necessary to provide a new air dehumidifier with good dehumidification capability so that the radiation air conditioning system can be widely applied to the user requirements in the monsoon climate region.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the fresh air dehumidifier and the radiation air-conditioning system, and the fresh air dehumidifier can obtain good dehumidification capacity and provide technical guarantee for the reliability of the radiation air-conditioning system in different application scenes.

The utility model provides a fresh air dehumidifier which comprises a box body, wherein the box body is provided with a fresh air inlet, an air outlet, an air supply outlet and a return air inlet; the refrigeration cycle system also comprises a total heat recoverer, a blower, an exhaust fan, a precooling coil pipe, a compressor, an evaporator, a main condenser and a secondary condenser which are arranged in the box body, wherein the compressor, the evaporator, the main condenser and the secondary condenser form a refrigeration cycle; the fresh air inlet, the first heat exchange channel of the total heat recoverer, the air feeder and the air supply outlet are sequentially arranged to form an air supply path, and the return air inlet, the second heat exchange channel of the total heat recoverer, the exhaust fan and the exhaust outlet are sequentially arranged to form an exhaust path; the compressor, the precooling coil, the evaporator and the main condenser are sequentially arranged between the total heat recoverer and the blower on the air supply path; the secondary condenser is arranged between the total heat recoverer on the exhaust path and the exhaust fan.

Optionally, the air conditioner further comprises three filters, a first filter is arranged on the inlet surface of the first heat exchange channel of the total heat recoverer on the air supply path, a second filter is arranged on the downstream side of the air return opening on the air exhaust path, and a third filter is arranged on the upstream side of the air blower on the air supply path.

Optionally, the first filter is a primary filter, the second filter is a medium-efficiency filter, and the third filter is a high-efficiency filter.

Optionally, the total heat recoverer is a plate fin total heat recoverer.

Optionally, the box body is further provided with an external water supply pipe and a water return pipe which are communicated with the pre-cooling coil pipe.

Optionally, the air supply path and the air exhaust path are constructed in the box body through a partition plate, and a plate edge of the partition plate is at least abutted against a top plate and a bottom plate of the box body.

Optionally, the air supply opening is a rectangular air supply opening.

Optionally, a bypass air valve is disposed on the partition plate beside the compressor to adjust an internal circulation flow from the air exhaust path to the air supply path.

Optionally, the air conditioner further comprises an air speed sensor arranged at the fresh air inlet, a condensed water disc and a condensed water pump, wherein the condensed water disc is arranged on a bottom plate of the box body, and condensed water stored in the condensed water disc can be discharged through the condensed water pump.

The utility model also provides a radiation air-conditioning system which comprises the fresh air dehumidifier.

Aiming at a radiation air-conditioning system, the scheme creatively provides a fresh air dehumidifier with a two-stage dehumidification function configuration, and particularly, a total heat recoverer, a blower, an exhaust fan, a precooling coil pipe, a compressor, an evaporator, a main condenser and a secondary condenser forming a refrigeration cycle are arranged in a box body of the fresh air dehumidifier; the system comprises a compressor, a precooling coil, an evaporator and a main condenser, wherein the compressor, the precooling coil, the evaporator and the main condenser are sequentially arranged between a total heat recoverer and a blower on an air supply path, and primary dehumidification, namely cold water type cooling dehumidification, is realized through the precooling coil arranged at the downstream of the total heat recoverer on the air supply path; meanwhile, through an evaporator arranged at the downstream of the precooling coil, secondary deep dehumidification of air, namely direct expansion type cooling dehumidification, is realized. Through engineering application tests, the fresh air dehumidifier adopting double cold sources and two-stage dehumidification can meet the standard that the moisture content of supplied air does not exceed 9.5g/(kg dry air). By applying the scheme, the indoor dehumidification device can be reliably used for indoor dehumidification in different monsoon climate areas, can effectively remove indoor wet load, ensures that the surface of the radiation plate is not dewed, and can meet the personalized service requirements of users.

In addition, the present solution is configured with two condensers of the refrigeration cycle, wherein the main condenser is disposed downstream of the evaporator for reheating the air; the secondary condenser is arranged at the upstream of the exhaust fan and used for recycling cold carried by return air. In the operation process, the energy utilization rate of the equipment can be effectively improved.

In the alternative of the utility model, three filters are included, which improves the user experience based on the good filtering function; further, the first filter disposed on the fresh air inlet surface of the total heat recovery unit in the air supply path is preferably a primary filter, for example, but not limited to, a primary filter configured as two G3 grade primary filters; a second filter, preferably a medium filter, such as but not limited to a sheet of medium filter of class F7, disposed on the downstream side of the return air inlet on the exhaust path; the third filter provided on the upstream side of the blower in the air blowing path is preferably a high efficiency filter, for example, but not limited to, a single H11 level high efficiency filter. By the arrangement, the cleanliness of the air inside the fresh air fan is guaranteed, the PM2.5 value of the air sent into a room is guaranteed to be below 75ug/m3, the CO2 concentration value of the air is below 700ppm, and the TVOC concentration of the air is below 0.5mg/m3, so that the requirements of national standards are met.

In another alternative of the utility model, an air supply path and an air exhaust path are constructed in the box body through the partition plate, and further, the plate edge of the partition plate is at least abutted against the top plate and the bottom plate of the box body, so that the structural strength of the whole machine is reasonably improved, and the operation reliability of the equipment is ensured.

In another alternative of the utility model, the internal circulation flow from the air exhaust path to the air supply path is adjusted by the bypass air valve, so that two operation modes of full fresh air and primary return air can be adopted, and the energy utilization rate of the equipment is improved to the maximum extent.

Drawings

FIG. 1 is an overall schematic view of a fresh air dehumidifier according to an embodiment;

FIG. 2 is a top view of the fresh air dehumidifier shown in FIG. 1;

FIG. 3 is a left side view of the fresh air dehumidifier shown in FIG. 2;

FIG. 4 is a right side view of the fresh air dehumidifier shown in FIG. 2;

FIG. 5 is a schematic view of an internal structure of the fresh air dehumidifier in the embodiment;

fig. 6 is a top view of the internal structure of the fresh air dehumidifier shown in fig. 5.

In the figure:

the air conditioner comprises a box body 10, a fresh air inlet 101, an exhaust outlet 102, an air supply outlet 103, an air return inlet 104, an external water pipe 105, a partition plate 106, a top plate 107 and a bottom plate 108;

total heat recoverer 20, blower 301, exhaust fan 302, pre-cooling coil 40, compressor 50, evaporator 60, main condenser 701, secondary condenser 702, first filter 801, second filter 802, third filter 803, bypass damper 90.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

Without loss of generality, the embodiment takes a fresh air dehumidifier with an outline box body shown in the figure as a description object to explain the implementation scheme of double-cold-source two-stage dehumidification in detail. It should be understood that the length-width ratio of the box body of the fresh air dehumidifier can be selected according to specific product requirements, and the shape and size of the box body do not substantially limit the fresh air dehumidifier claimed in the present application.

Please refer to fig. 1, fig. 2, fig. 3 and fig. 4, wherein fig. 1 is an overall schematic view of the fresh air dehumidifier according to the embodiment, fig. 2 is a top view of the fresh air dehumidifier shown in fig. 1, fig. 3 is a left side view of the fresh air dehumidifier, and fig. 4 is a right side view of the fresh air dehumidifier.

As shown in the figure, the box body 10 of the dehumidifier is provided with a fresh air inlet 101, an exhaust outlet 102, a supply air inlet 103 and a return air inlet 104, wherein the fresh air inlet 101 and the exhaust outlet 102 are communicated with the outdoor space, and the supply air inlet 103 and the return air inlet 104 are used for communicating the indoor space.

A total heat recoverer 20, a blower 301, an exhaust fan 302, a precooling coil 40, a compressor 50, an evaporator 60, a main condenser 701 and a secondary condenser 702 which form a refrigeration cycle are arranged in the box body 10; please refer to fig. 5 and fig. 6 together, wherein fig. 5 is a schematic diagram of an internal structure of the fresh air dehumidifier in the embodiment, and fig. 6 is a top view of the internal structure of the fresh air dehumidifier shown in fig. 5.

The plate-fin total heat recovery device 20 adopted in the scheme carries out indirect heat exchange on air intake and exhaust through a plurality of layers of parallel alternate channels, and the heat recovery efficiency can reach 55%. Here, the air intake channel is defined as a first heat exchange air channel, and the air exhaust channel is defined as a second heat exchange air channel. The specific function implementation structure of the plate-fin total heat recovery device is not the core invention point of the present application, and those skilled in the art can implement the function based on the prior art, so the detailed description is omitted here.

The fresh air inlet 101, the first heat exchange channel of the total heat recoverer 20, the blower 103 and the air supply outlet 103 are sequentially configured to form an air supply path, and the return air inlet 104, the second heat exchange channel of the total heat recoverer 20, the exhaust fan 302 and the exhaust outlet 102 are sequentially configured to form an exhaust path; as shown in the figure, the total heat recovery device 20 is located at the suction side of the air supply and exhaust fan, so that the air flow entering the total heat recovery device 20 is uniform, and the air leakage amount of the exhaust air is less on the premise of ensuring that the air pressure at the fresh air side is greater than the air pressure at the exhaust air side.

The pre-cooling coil 40 is disposed behind the total heat recovery device 20, and is externally connected with a chilled water external water pipe 105, specifically an external water supply pipe and a water return pipe, disposed on the box body 10, so as to be connected with a cold and heat source to establish a water supply and return cycle of the pre-cooling coil 40, thereby achieving pre-cooling or pre-heating and primary dehumidification in summer. Preferably, cold water with the temperature of 7 ℃/12 ℃ is introduced in summer, and hot water with the temperature of 35 ℃/30 ℃ is introduced in winter.

The compressor 50, the evaporator 60, the main condenser 701 and the sub-condenser 702 in the tank constitute a complete vapor compression refrigeration cycle, which is based on the reverse carnot cycle principle.

Specifically, the compressor 50, the pre-cooling coil 40, the evaporator 60, and the main condenser 701 are sequentially provided between the total heat recoverer 20 and the blower 103 in the blower path. An evaporator 60 is disposed downstream of pre-cooling coil 40 to achieve a two-stage deep dehumidification of the air.

Wherein, the main condenser 701 is disposed downstream of the evaporator 60 coil on the exhaust path for reheating the air; the secondary condenser 702 is disposed between the total heat recoverer 20 and the exhaust fan 302 in the exhaust path, in other words, the secondary condenser 702 is disposed in front of the exhaust fan 302, so that the cooling capacity in the return air can be effectively recovered and utilized, and the energy utilization rate of the equipment can be effectively improved. Here, the blower 301 and the exhaust blower 302 may be variable frequency blowers, power is provided by a permanent magnet brushless dc motor, and the amount of air supplied can be adjusted according to the quality of air in a room during operation of the apparatus, so as to realize supply according to the need.

The fresh air dehumidifier adopting the double-cold-source two-stage dehumidification is subjected to unit trial production detection, meets the standard that the moisture content of supplied air is not more than 9.5g/(kg dry air), can effectively remove indoor moisture load, ensures that the surface of the radiation plate is not dewed, and can meet the indoor dehumidification requirements of different monsoon climate areas.

It should be noted that the household fresh air dehumidifier needs to work normally all the year round, and the working conditions to be involved include the functional requirements of dehumidification and reheating in summer or transition seasons and heating in winter, and meanwhile, the household fresh air dehumidifier needs to have good heat recovery and air quality requirements.

In order to further ensure the requirement of space cleanliness standard, the fresh air dehumidifier provided by the embodiment comprises three filters: a first filter 801, a second filter 802, and a third filter 803.

The first filter 801 is arranged on the first heat exchange channel inlet surface of the total heat recoverer 20 on the air supply path, namely on the fresh air side; the first filter 801 is a primary filter of an air conditioning system, and is mainly used for filtering dust particles of 5 μm or more, and is, for example, but not limited to, two G3-grade primary filters. Here, the primary filter G3 is one of the efficiency classes of the primary air filter G series.

The second filter 802 is disposed on the downstream side of the return air inlet 104 on the exhaust path, that is, on the return air side; such as but not limited to a piece of class F7 medium effect filter. Here, the class F7 medium effect filter is one of the efficiency classes of the bag type medium effect filter series.

A third filter 803 provided on the upstream side of the blower in the air blowing path, for trapping particulate dust and various suspended substances of 0.5um or more; the third filter 803 is used in conjunction with a primary filter and a secondary filter, such as but not limited to a one-piece H11 grade high efficiency filter. Here, the H11 level high efficiency filter is one of the efficiency classes of high efficiency filters.

By the arrangement, the cleanliness of the air inside the fresh air fan is ensured, the PM2.5 value of the air sent into a room is ensured to be below 75ug/m3, the CO2 concentration value of the air is below 700ppm, and the TVOC concentration of the air is below 0.5mg/m3, which all meet the requirements of national standards.

In other implementations, the three filters may be selected to have other levels of efficiency as desired, and it is understood that it is within the scope of the present application to match the application to meet air cleanliness usage requirements.

Specifically, an upper air supply path and an air exhaust path are constructed in the box body 10 through the partition plates 106, and partition plates at corresponding positions are arranged to form separation of the air supply path and the air exhaust path, so that crosstalk is reliably avoided. In practical applications, the shape and structure of the partition 106 inside the casing 10 may be determined according to specific product configurations, for example, but not limited to, the actual size parameters of the total recuperator 20, the blower 301, the exhaust fan 302, the pre-cooling coil 40, the filters of each stage, and the refrigeration cycle need to be considered.

Further, the plate edge of the partition 106 abuts at least the top plate 107 and the bottom plate 108 of the box 10, so that the structural strength of the whole machine can be ensured, and the operational reliability of the equipment can be ensured.

In order to improve the energy utilization rate to the maximum extent, a bypass air valve 90 is arranged in the scheme. As shown in fig. 5 and 6, the bypass damper 90 is provided on a partition plate on the side of the compressor 50 to adjust the flow rate of the internal circulation from the discharge air path to the supply air path. Therefore, two operation modes of full fresh air and primary return air can be adopted, and a good energy-saving effect is achieved.

In a specific application, based on the configuration of the corresponding sensor, when the carbon dioxide concentration, the PM2.5 concentration and the TVOC content of a room exceed set values, the air volume of the blower 301 is automatically adjusted to the corresponding set air volume; meanwhile, the corresponding bypass damper 90 is opened correspondingly, that is, the full fresh air mode is opened. It is understood that the specific implementation of the bypass damper is not the core invention of the present application, and those skilled in the art can also implement the bypass damper based on the prior art, and therefore, the detailed description is omitted here.

In addition, in specific application, the fresh air dehumidifier can be further provided with a wind speed sensor (not shown in the figure) at a fresh air inlet for measuring the fresh air speed. In addition, a condensate tray and a condensate pump (not shown) may be further provided, and particularly, the condensate tray may be provided on a bottom plate of the cabinet, and condensate stored in the condensate tray may be discharged through the condensate pump, so that condensate condensed after deep dehumidification may be effectively treated in time. In other embodiments, a condensate pan is provided at least in the region from the cold coil 40 to the main condenser 701.

The air treatment process in a typical season is briefly described below by taking the Beijing area as an example:

refrigeration process in summer

Outdoor fresh air with high temperature and high humidity in summer is primarily filtered by a first filter 801 to filter large-particle pollutants; the air entering the total heat recoverer 20 exchanges sensible heat and latent heat with the indoor return air, and the temperature and the moisture content of the air are reduced to a certain degree; then passes through the pre-cooling coil 40 to carry out primary dehumidification, the temperature is reduced to a certain extent while dehumidification is carried out, then the air enters the evaporator 60 to carry out secondary deep dehumidification, the temperature reaches the dew point temperature of the machine, the relative humidity reaches more than 95 percent, the air enters the main condenser 701 to reheat the air temperature, the air passes through the third filter 803 after reaching the air supply temperature, the air is efficiently filtered to reach the set air quality, and then the air is sent into a room by the air feeder 301.

Condensed water is separated out in the process of carrying out two-stage low-temperature dehumidification by the unit, and when the condensed water in the condensed water tray is stored to a certain degree, the condensed water pump is started and drains to a drainage point near the unit through a condensed water pipeline.

Meanwhile, the indoor return air is subjected to intermediate-efficiency filtration by the second filter 802, and all the return air enters the total heat recoverer 20 to effectively recover cold in a total fresh air mode, so that the temperature and the moisture content are improved, and then the return air is further recovered by the secondary condenser 702 and is discharged to the outdoor.

Specifically, the secondary deep dehumidification function can be operated according to the room dehumidification requirement in summer. And when the room controller (participating in humidity control) knows that the current humidity is greater than the set humidity, starting the dehumidification function of the compressor.

Compared with the traditional dehumidification technology, the fresh air dehumidifier provided by the embodiment has the following advantages:

firstly, in the current mainstream cold source frozen aquatic product samples, the temperature range of the outlet water of the frozen water is noted to be between 5 and 25 ℃, but the internal refrigeration cycle process design is designed according to the traditional water with the temperature of 7 ℃, so that the COP value (coefficient of performance of cycle) is not greatly improved after the outlet water temperature is improved. In order to enable the cold source to be better matched with the household fresh air machine, the primary dehumidifying water coil of the fresh air dehumidifier provided by the embodiment can be filled with chilled water at 7 ℃, and the primary dehumidifying water coil is substantially different from a precooling coil of a current mainstream fresh air machine which is filled with high-temperature chilled water at more than 16 ℃. Therefore, the cold source device can be used in cooperation with mainstream cold source equipment, and the application range is wider.

Secondly, for two-stage dehumidification, the current mainstream technology is to arrange a compressor and a condenser externally or internally, and both the compressor and the condenser cannot give consideration to working noise and installation reliability. This example divides the condenser into: the main condenser 701 and the secondary condenser 702 reduce the air supply temperature of fresh air to enable the fresh air to meet a certain air supply temperature difference, and the secondary condenser 702 is used for recycling the cold of partial exhaust air, so that the energy is efficiently utilized. In addition, in order to reduce noise, the top-stage built-in compressor 50 is selected and may be further subjected to a damping process.

Process for heating in winter

The same direction as the air flows in summer, except that the pre-cooling coil 40 is supplied with hot water to heat the air, and the compressor 50 is turned off; meanwhile, a humidification section (not shown in the figure) can be added on the blast pipeline for independent air humidification treatment. After the low-temperature and low-humidity outdoor air is heated and humidified to the set parameter requirement, the air is sent to the indoor environment.

It should be noted that, in order to reduce the noise of the blower and ensure that the air supply channel conforms to the characteristics of the aerodynamic force, the air supply outlet is designed into a rectangular air outlet.

In addition to the fresh air dehumidifier, the present embodiment also provides a radiation air conditioning system, which includes a fresh air dehumidifier, wherein the fresh air dehumidifier is the fresh air dehumidifier shown in fig. 1 to 6, and can be configured with a touch screen, so as to realize start-stop control, air volume adjustment, compressor start-stop and the like of the fresh air machine. During engineering application, the suspended ceiling can be directly hoisted in the suspended ceiling, effective space is not occupied, distributed design layout is realized, temperature and humidity control in a specific area is met, and the suspended ceiling is particularly suitable for load requirements of different functional areas in public buildings.

It should be understood that other functions of the radiation air conditioning system are not the core invention point of the present application, and those skilled in the art can implement the functions based on the prior art, so that the detailed description is omitted here.

The ordinal numbers "first" and "second" used herein are only used to describe a common functional component or structure in the claims. It is to be understood that the use of the ordinal numbers "first" and "second" does not constitute an understandable limitation on the technical solutions claimed in the present application.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. A fresh air dehumidifier is characterized by comprising a box body, wherein the box body is provided with a fresh air inlet, an air outlet, an air supply outlet and a return air inlet; the refrigeration cycle system also comprises a total heat recoverer, a blower, an exhaust fan, a precooling coil pipe, a compressor, an evaporator, a main condenser and a secondary condenser which are arranged in the box body, wherein the compressor, the evaporator, the main condenser and the secondary condenser form a refrigeration cycle;

the fresh air inlet, the first heat exchange channel of the total heat recoverer, the blower and the air supply outlet are sequentially configured to form an air supply path, and the air return inlet, the second heat exchange channel of the total heat recoverer, the exhaust fan and the air outlet are sequentially configured to form an air exhaust path;

the compressor, the precooling coil, the evaporator and the main condenser are sequentially arranged between the total heat recoverer and the blower on the air supply path; the secondary condenser is arranged between the total heat recoverer on the exhaust path and the exhaust fan.

2. The fresh air dehumidifier as claimed in claim 1, further comprising three filters, a first filter being disposed on an inlet surface of the first heat exchanging passage of the total heat recoverer in the air supply path, a second filter being disposed on a downstream side of the return air inlet in the air exhaust path, and a third filter being disposed on an upstream side of the air blower in the air supply path.

3. The fresh air dehumidifier of claim 2, wherein the first filter is a primary filter, the second filter is a secondary filter, and the third filter is a high efficiency filter.

4. The fresh air dehumidifier of any of claims 1-3, wherein the total heat recuperator is a plate-fin total heat recuperator.

5. The fresh air dehumidifier as claimed in claim 4, wherein the box body is further provided with an external water supply pipe and a water return pipe which are communicated with the precooling coil.

6. The fresh air dehumidifier of claim 1 wherein the supply air path and the exhaust air path are formed in the box body by a partition plate, and a plate edge of the partition plate is at least abutted against a top plate and a bottom plate of the box body.

7. The fresh air dehumidifier of claim 6, wherein the supply air outlet is a rectangular supply air outlet.

8. The fresh air dehumidifier of claim 6 or 7, wherein a bypass air valve is arranged on the partition plate beside the compressor to adjust the internal circulation flow from the air exhaust path to the air supply path.

9. The fresh air dehumidifier as claimed in claim 1, further comprising an air speed sensor, a condensed water tray and a condensed water pump which are arranged at the fresh air inlet, wherein the condensed water tray is arranged on a bottom plate of the box body, and condensed water stored in the condensed water tray can be discharged through the condensed water pump.

10. A radiant air conditioning system comprising a fresh air dehumidifier as claimed in any one of claims 1 to 9.