Energy-saving fresh air device

Abstract

An energy-saving fresh air device comprises an air inlet unit, an air exhaust unit, an outdoor unit and an automatic control system. The outdoor unit comprises a compressor, a condenser, a refrigerant low-pressure section, a refrigerant medium-pressure section and a refrigerant high-pressure section, the refrigerant low-pressure section, the refrigerant medium-pressure section and the refrigerant high-pressure section are communicated with the compressor, and the inlet end of an electronic adjusting three-way valve arranged in the outdoor unit is connected with the compressor so that high-pressure refrigerant compressed by the compressor can be connected in. The first outlet end of the electronic adjusting three-way valve is connected with the condensation heat recovery section in the air inlet unit through the refrigerant high-pressure section, and the second outlet end of the electronic adjusting three-way valve is connected with the refrigerant medium-pressure section through the condenser; the inlet end of the evaporation section of the air inlet unit is provided with a decompression device and communicates with the condensation heat recovery section and the refrigerant medium-pressure section, and the outlet end of the evaporation section communicates with the refrigerant low-pressure section. According to the principle that a refrigerant absorbs heat through evaporation and releases heat through compression, the temperature and humidity range is preset through the automatic control system, the working state of each section body is automatically adjusted according to the preset temperature and humidity range, fresh air is treated, and energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air treatment, and in particular to an energy-saving fresh air device. Background Art

[0002] The air conditioning system is designed to provide a controlled, comfortable and healthy air environment for indoor activity spaces or to provide specific air environment conditions for activities such as warehousing, processing, equipment operation, etc. Air conditioning mainly includes controlling air quality (dust particles, bacteria concentration), air temperature, air humidity and wind speed.

[0003] A more natural and effective way to control air quality is to use outdoor fresh air to replace or dilute indoor air, that is, to inhale outdoor fresh air and exhaust indoor gas. In the existing fresh air system, for fresh air in a high humidity environment, the moisture in the fresh air is generally condensed through a condenser to achieve the purpose of fresh air dehumidification and cooling. However, condensation and dehumidification will significantly reduce the temperature of the fresh air, which is generally lower than the appropriate temperature required indoors. Electric heating or other heating methods are required to heat the low-temperature fresh air after condensation and dehumidification to an appropriate temperature before entering the room. Using a separate cold source to condense and dehumidify the moisture in the fresh air and then electrically reheating or other forms of heating the dehumidified fresh air separately to meet the air supply conditions, this treatment method has problems such as high energy consumption, large fluctuations in temperature and humidity, and poor stability. Summary of the invention

[0004] The present application effectively utilizes the temperature difference between the exhaust gas in the exhaust unit and the fresh air in the fresh air unit, recovers the sensible heat of the exhaust gas and the sensible heat of the outdoor air in summer to form a first heat source for reuse, and recovers the heat released by the compressor when compressing the refrigerant to form a second heat source. By optimizing the arrangement order of each functional section, a refrigerant medium-pressure section is connected to the inlet end of the evaporation section to further utilize the refrigerant pressure reduction and heat absorption to achieve a better cooling and dehumidification effect. A temperature and humidity range is set by an automatic control system and the working state of each functional section is automatically controlled according to the temperature and humidity range, thereby minimizing energy consumption, thereby solving the high energy consumption problem that cannot be solved by traditional fresh air treatment methods.

[0005] In order to solve the technical problems existing in the prior art, the present application provides an energy-saving fresh air device, including an air intake unit, an exhaust unit, an external unit and an automatic control system, wherein the air intake unit includes a fresh air primary filter section, a fresh air fan section, a heat pipe circulation recovery front section, a surface cooling section, an evaporation section, a heat pipe circulation recovery rear section, a reheat coil section, a condensation heat recovery section and a humidification section from the fresh air inlet end to the fresh air outlet end; the exhaust unit includes an exhaust air primary filter section, an exhaust fan section, a water washing spray section, a heat pipe circulation recovery middle section, an oxidation disinfection section, at least one activated carbon adsorption section and a high-efficiency filtration section from the exhaust air inlet end to the exhaust air outlet end; the heat pipe circulation recovery front section, the heat pipe circulation recovery middle section and the heat pipe circulation recovery rear section form a closed loop to recycle the sensible heat of fresh air and exhaust air; the external unit includes a compressor, a condenser, a refrigerant low-pressure section connected to the compressor, a refrigerant medium-pressure section and a refrigerant high-pressure section, an electronic regulating three-way valve is arranged in the external unit, and the electronic regulating three-way valve The inlet end is connected to the compressor to receive the high-pressure refrigerant compressed by the compressor, the first outlet end of the electronic regulating three-way valve is connected to the condensation heat recovery section via the refrigerant high-pressure section, and the second outlet end of the electronic regulating three-way valve is connected to the refrigerant medium-pressure section via the condenser; the inlet end of the evaporation section is provided with a pressure reducing device and is connected to the condensation heat recovery section and the refrigerant medium-pressure section, and the outlet end of the evaporation section is connected to the refrigerant low-pressure section; the automatic control system includes a central controller and a compressor frequency controller, a temperature and humidity preset module, a temperature and humidity sensor arranged at the fresh air inlet end, a temperature and humidity sensor installed at the exhaust air inlet end, and a switch controller arranged at each section, respectively connected to the central controller, the central controller is used to compare the temperature range and humidity range preset by the temperature and humidity preset module with the temperature and humidity values ​​read by the temperature and humidity sensors at the fresh air inlet end and the temperature and humidity sensors at the exhaust air inlet end, and automatically adjust the working state of each section.

[0006] In certain embodiments, the air intake unit further includes a medium efficiency filter section and a sub-high efficiency filter section which are sequentially arranged behind the fresh air fan section and in front of the heat pipe circulation recovery front section.

[0007] In certain embodiments, the switch controller provided in each section includes an electric regulating three-way valve provided on the pipeline connecting the middle section of the heat pipe circulation recovery and the rear section of the heat pipe circulation recovery, a proportional electric valve provided on the surface cooling section, and control switches respectively provided on the humidification section and the reheat coil section.

[0008] In certain embodiments, the front section of the heat pipe circulation recovery includes a front section coil of the heat pipe circulation recovery, the middle section of the heat pipe circulation recovery includes a middle section coil of the heat pipe circulation recovery, and the rear section of the heat pipe circulation recovery includes a rear section coil of the heat pipe circulation recovery; the inlet end of the electric regulating three-way valve is connected to the outlet end of the middle section coil of the heat pipe circulation recovery, the first outlet end of the electric regulating three-way valve is connected to the inlet end of the rear section coil of the heat pipe circulation recovery, the second outlet end of the electric regulating three-way valve is connected to the outlet end of the rear section coil of the heat pipe circulation recovery, the inlet end of the front section coil of the heat pipe circulation recovery is connected to the outlet end of the rear section coil of the heat pipe circulation recovery, and the inlet end of the middle section coil of the heat pipe circulation recovery is connected to the outlet end of the front section coil of the heat pipe circulation recovery; the front section coil of the heat pipe circulation recovery, the rear section coil of the heat pipe circulation recovery and the middle section coil of the heat pipe circulation recovery are filled with ethylene glycol liquid, and an ethylene glycol solution pump is provided on the pipeline connecting the inlet end of the middle section coil of the heat pipe circulation recovery and the outlet end of the front section coil of the heat pipe circulation recovery.

[0009] In certain embodiments, the evaporation section comprises an evaporation coil, and a drying filter is further disposed at the inlet end of the evaporation coil.

[0010] In certain embodiments, the condensing heat recovery section comprises a condensing heat recovery section coil.

[0011] In certain embodiments, the energy-saving fresh air device further includes an electric auxiliary heating segment installed behind the humidification segment, and the switch controller provided on each segment further includes a control switch provided on the electric auxiliary heating segment.

[0012] In certain embodiments, the pressure reducing device is an electronic pressure reducing valve.

[0013] In certain embodiments, the temperature and humidity preset module presets a room temperature range of 19-24° C. and a humidity range of 40%-65%.

[0014] Beneficial Effects

[0015] The present application optimizes the arrangement order of each functional section (the fresh air fan and the exhaust fan are respectively located at the front end of the air intake unit and the exhaust unit, and a surface cooling section is arranged in front of the evaporation section), and arranges a refrigerant medium-pressure section to connect to the inlet end of the evaporation section to further utilize the refrigerant to reduce pressure and absorb heat to achieve better cooling and dehumidification effects. At the same time, the present application sets a temperature and humidity range through an automatic control system and dynamically tracks the dynamic parameters of indoor air and outdoor fresh air. According to the temperature and humidity range, the working status of each functional section is automatically subdivided and controlled. As long as the fresh air temperature and humidity are within the set range, no adjustment is made, so that the entire unit always works in a constant cold and hot state, thereby maximizing the reduction of energy consumption (energy consumption can be reduced by multiples or even to zero), while extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present application is further described below in conjunction with the accompanying drawings and embodiments. In the accompanying drawings:

[0017] Figure 1 It is a structural schematic diagram of an energy-saving fresh air device;

[0018] Figure 2 It is a schematic diagram of the specific structure of an energy-saving fresh air device;

[0019] Figure 3 The figure is a schematic diagram of the external unit structure of an energy-saving fresh air device.

[0020] Description of reference numerals:

[0021] 1 Fresh air unit; 11 Fresh air primary filter section; 12 Fresh air fan section; 13 Medium efficiency filter section; 14 Sub-high efficiency filter section; 15 Heat pipe circulation recovery front section; 151 Heat pipe circulation recovery front section coil; 16 Surface cooling section; 161 Surface cooling coil; 17 Evaporation section; 171 Evaporation coil; 172 Electronic pressure reducing valve; 173 Dry filter; 18 Heat pipe circulation recovery rear section; 181 Heat pipe circulation recovery rear section coil; 182 Electric regulating three-way valve; 19 Reheat coil section; 20 Condensation heat recovery section; 201 Condensation heat recovery section coil; 21 Humidification section; 22 Electric auxiliary heating section; 2 Exhaust fan unit; 23 Exhaust primary filter section; 24 Exhaust fan section; 25 Water washing spray section; 26 Heat pipe circulation recovery middle section; 27 Oxidation disinfection section; 28 Activated carbon adsorption first section; 29 Activated carbon adsorption second section; 30 High efficiency filter section;

[0022] 3 external unit; 31 compressor; 32 low-pressure section of refrigerant; 33 high-pressure section of refrigerant; 331 electronic regulating three-way valve; 34 medium-pressure section of refrigerant; 341 one-way two-way valve; 35 condenser. DETAILED DESCRIPTION

[0023] The technical solution of the present application will be described in detail below in conjunction with the accompanying drawings and embodiments, but the present application is not limited to the scope of the embodiments.

[0024] The key concept of the present application is to provide an energy-saving fresh air device, which optimizes the arrangement of the functional sections of the fresh air device, presets the temperature and humidity range, and uses an automatic control system to adjust the working state of each section, so as to fully utilize the energy generated during the compression and decompression of the refrigerant and the recovered energy of the exhaust gas and the sensible heat of the fresh air to adjust the temperature and humidity of the fresh air gas, thereby minimizing energy consumption.

[0025] like Figure 1 and 2As shown, the air intake unit 1 of the energy-saving fresh air device includes, from the fresh air inlet end to the fresh air outlet end, a fresh air primary filter section 11, a fresh air fan section 12, a medium efficiency filter section 13, a sub-high efficiency filter section 14, a heat pipe circulation recovery front section 15, a surface cooling section 16, an evaporation section 17, a heat pipe circulation recovery rear section 18, a reheat coil section 19, a condensation heat recovery section 20 and a humidification section 21.

[0026] The fresh air primary filter section 11 is used for the initial filtration of dust in the fresh air. The fresh air fan section 12 is installed in front of the other functional sections after the fresh air primary filter section 11, and blows air to the functional sections of the rear section in the form of positive pressure, which can easily overcome the resistance of the functional sections of the rear section, reduce the power consumption of the fan, and stabilize the wind speed. At the same time, it can be installed after the fresh air primary filter section 11 to reduce the dust from entering the fresh air fan and protect the fan from damage. The medium efficiency filter section 13 and the sub-high efficiency filter section 14 are used to further filter the dust in the fresh air.

[0027] The exhaust unit 2 includes an exhaust primary filter section 23, an exhaust fan section 24, a water washing spray section 25, a heat pipe circulation recovery middle section 26, an oxidation disinfection section 27, an activated carbon adsorption section 1 28, an activated carbon adsorption section 29 and a high-efficiency filtration section 30 from the exhaust inlet end to the exhaust outlet end.

[0028] The exhaust primary filter section 23 is used for the initial filtration of dust in the exhaust air. The exhaust fan section 24 blows air to the rear stage in the form of positive pressure, which can overcome the resistance of each functional section in the rear section and reduce energy consumption. The water washing spray section 25 can remove harmful substances such as amines and nitrogen in the exhaust gas. The oxidation disinfection section 27 can sterilize the exhaust gas. The fresh air is further filtered by the activated carbon adsorption section 1 28 and the activated carbon adsorption section 29, and then the dust particles in the air are filtered by the high-efficiency filter of the high-efficiency filter section 30 before being discharged outdoors, and the discharge height is higher than 35M.

[0029] like Figure 3 As shown, the external unit 3 includes a compressor 31, a condenser 35, a refrigerant low-pressure section 32 connected to the compressor, a refrigerant medium-pressure section 34 and a refrigerant high-pressure section 33. An electronic regulating three-way valve 331 is also provided in the external unit, the inlet end of the electronic regulating three-way valve 331 is connected to the compressor 31 to receive the high-pressure refrigerant compressed by the compressor, the first outlet end of the electronic regulating three-way valve 331 is connected to the condensation heat recovery section 20 through the refrigerant high-pressure section 33; the second outlet end of the electronic regulating three-way valve is connected to the refrigerant medium-pressure section 34 through the condenser 35 and the one-way two-way valve 341; the condenser 35 has a condenser coil, and the high-pressure refrigerant compressed by the compressor can flow into the condenser 35 through the control of the electronic regulating three-way valve 331, and the high-pressure refrigerant becomes a medium-pressure refrigerant after passing through the condenser 35.

[0030] The automatic control system includes a central controller for controlling the operation of each segment, a compressor 31 frequency controller, a temperature and humidity preset module, a temperature and humidity sensor arranged at the fresh air inlet end, a temperature and humidity sensor installed at the exhaust air inlet end, and a switch controller arranged at each segment. The central controller automatically adjusts the working state of each segment by comparing the temperature and humidity range preset by the temperature and humidity preset module with the temperature and humidity values ​​read by the temperature and humidity sensors at the fresh air inlet end and the temperature and humidity sensors at the exhaust air inlet end.

[0031] In the above-mentioned energy-saving fresh air device, the switch controllers arranged in each section include an electric regulating three-way valve 182 arranged on the pipeline connecting the middle section 26 of the heat pipe circulation recovery and the rear section 18 of the heat pipe circulation recovery, a proportional electric valve arranged on the surface cooling section 16, and control switches respectively arranged in the humidification section 21 and the reheat coil section 19.

[0032] like Figure 2 As shown, the surface cooling coil 161 in the surface cooling section 16 is connected to the air conditioning cold (hot) water system, and the central controller adjusts the proportional electric valve installed on the surface cooling coil 161 in the surface cooling section 16 to adjust the fresh air temperature. When the medium-pressure refrigerant from the condensation heat recovery section 20 and the refrigerant medium-pressure section 34 cannot meet the cooling and dehumidification requirements of the evaporation section 17, the control system turns on the surface cooling section 16 to assist in cooling.

[0033] An evaporation coil 171 is installed in the evaporation section 17. The inlet end of the evaporation coil 171 is arranged at the upper part of the evaporation section 17, and the outlet end of the evaporation coil 171 is arranged at the lower part of the evaporation section 17. The inlet end of the evaporation coil 171 is also provided with a drying filter 173 and an electronic pressure reducing valve 172, and is connected to the condensation heat recovery section 20 and the refrigerant medium-pressure section 34. The outlet end of the evaporation section 17 is connected to the refrigerant low-pressure section 32, and the low-pressure liquid refrigerant returns to the compressor from the outlet end of the evaporation coil 171 through the compressor low-pressure section 32 for a secondary power cycle.

[0034] In the above energy-saving fresh air device, the reheat coil section 19 is connected to the air conditioning hot water system. When the temperature of the fresh air is still lower than the preset temperature range after passing through the heat pipe circulation recovery section 18, the central controller opens the control switch of the reheat coil section 19 to allow the air conditioning hot water to flow into the reheat coil section 19 for further heating of the fresh air.

[0035] In the above energy-saving fresh air device, a condensation heat recovery section coil 201 is also installed in the condensation heat recovery section 20, and the outlet end of the condensation heat recovery section coil 201 is arranged in the upper part of the condensation heat recovery section 20. A one-way two-way valve is arranged at the outlet end of the condensation heat recovery section coil 201 and is connected to the inlet end of the evaporation coil 171 through a pipeline. The pipeline connecting the refrigerant high-pressure section 33 and the inlet end of the condensation heat recovery section coil 201 is installed at the lower part of the condensation heat recovery section 20. The high-pressure refrigerant from the compressor flows into the condensation heat recovery section coil 201 in the condensation heat recovery section 20 through the refrigerant high-pressure section 33 to heat the fresh air and become a medium-pressure refrigerant. After that, it flows into the evaporation section 17 through the inlet end of the evaporation coil 171 through the electronic pressure reducing valve 172 to evaporate and absorb heat, so that the temperature of the evaporation coil 171 is reduced, and the moisture in the outdoor high-humidity fresh air condenses after contacting the low-temperature evaporation coil 171, condensing the excess moisture in the air, thereby achieving the effect of fresh air dehumidification. When the fresh air needs to be heated by the condensing heat recovery section 20 , the first outlet of the electronic regulating three-way valve is opened to control the high-pressure refrigerant to flow into the condensing heat recovery section 20 .

[0036] When the medium-pressure refrigerant flowing out of the condensation heat recovery section 20 cannot meet the cooling and dehumidification requirements of the evaporation section 17, the second outlet of the electronic regulating three-way valve 331 is opened. At this time, the high-pressure refrigerant becomes medium-pressure refrigerant after heat dissipation through the external machine condenser 35, and the medium-pressure refrigerant flows into the evaporation section 17 through the refrigerant medium-pressure section 34 for further evaporation, heat absorption, cooling and dehumidification. The flow direction of the high-pressure refrigerant can be adjusted by setting the electronic regulating three-way valve 331. The high-pressure refrigerant directly enters the condensation heat recovery section coil 201 to exchange heat with the fresh air to heat the fresh air, or the high-pressure refrigerant passes through the external machine condenser 35 to become medium-pressure refrigerant and enters the evaporation section for heat absorption and cooling of the fresh air, so that the above energy-saving fresh air device is suitable for fresh air treatment in different environments.

[0037] In the above energy-saving fresh air device, the heat pipe circulation recovery front section 15, the heat pipe circulation recovery middle section 26 and the heat pipe circulation recovery rear section 18 form a closed loop to recycle the sensible heat of fresh air and exhaust air. The heat pipe circulation recovery front section 15 includes a heat pipe circulation recovery front section coil 151, and the inlet and outlet ends of the heat pipe circulation recovery front section coil 151 are both arranged at the upper part of the heat pipe circulation recovery front section 15; the heat pipe circulation recovery rear section 18 includes a heat pipe circulation recovery rear section coil 181, and the inlet and outlet ends of the heat pipe circulation recovery rear section coil are arranged at the upper part of the heat pipe circulation recovery rear section; the heat pipe circulation recovery middle section 26 includes a heat pipe circulation recovery middle section coil, and the inlet and outlet ends of the heat pipe circulation recovery middle section coil are arranged at the lower part of the heat pipe circulation recovery middle section. The heat pipe circulation recovery front section coil 151, the heat pipe circulation recovery rear section coil 181 and the heat pipe circulation recovery middle section coil are filled with ethylene glycol liquid. An ethylene glycol solution pump is provided on the pipeline connecting the middle section of the heat pipe circulation recovery and the front section of the heat pipe circulation recovery. The inlet end of the heat pipe circulation recovery front section coil 151 is connected to the outlet end of the heat pipe circulation recovery rear section coil 181 through a pipeline. The inlet end of the heat pipe circulation recovery middle section coil is connected to the outlet end of the heat pipe circulation recovery front section coil 151 through a pipeline. The inlet end of the electric regulating three-way valve 182 is connected to the outlet end of the heat pipe circulation recovery middle section coil, the first outlet end of the electric regulating three-way valve 182 is connected to the inlet end of the heat pipe circulation recovery rear section coil 181, and the second outlet end of the electric regulating three-way valve 182 is connected to the outlet end of the heat pipe circulation recovery rear section coil 181. By setting a multi-effect circulation recovery coil, the temperature difference between the exhaust gas in the exhaust unit 2 and the fresh air in the fresh air unit 1 can be effectively utilized, so that the cold and heat sources of the exhaust section can be fully utilized, and energy can be further saved. The electric regulating three-way valve 182 is used to control the refrigerant liquid to flow into the rear coil of the heat pipe circulation recovery to exchange heat with the fresh air, which is beneficial to the regulation of the fresh air temperature, so that the above energy-saving fresh air device is suitable for fresh air treatment in different environments.

[0038] The energy-saving fresh air device also includes an electric auxiliary heating section 22 installed behind the humidification section 21, and the switch controller provided on each section body also includes a control switch provided on the electric auxiliary heating section 22. The electric auxiliary heating section 22 only plays an auxiliary heating role. When the temperature of the fresh air still cannot reach the preset temperature range after being processed by each section of the air intake unit, the electric heating further adjusts the temperature of the fresh air to ensure the normal operation of the fresh air unit.

[0039] In the above energy-saving fresh air device, the temperature range of the room set by the temperature and humidity preset module is 19-24°C, and the humidity range is 40%-65%. When the humidity in summer is within the range of 40%-65%, the humidity can be left unadjusted. When the humidity is too high, the temperature is raised to the highest point of the set value, 24°C, and dehumidification is performed at the same time. When the temperature is high, dehumidification will be reduced, and the power consumption of dehumidification will also be reduced at the same time. Similarly in winter, when humidifying, the temperature is first kept at the lowest point of the set temperature, 19°C. At this time, the humidification amount will be reduced accordingly, and the energy consumption will be minimized. When the energy consumption is reduced, the control requirements will be reduced, so that the system operation will be more stable. The temperature and humidity in the transition season are mostly within the set range, so the energy consumption in the transition season is close to 0 (except for the fan). The control system in this application dynamically tracks the temperature and humidity. When the temperature and humidity of the fresh air are within the set range, no regulation is performed. Compared with setting a specific temperature and humidity value, the energy-saving fresh air device of this application reduces energy consumption to the maximum extent.

[0040] Example 1 Treatment of low-temperature and low-humidity outdoor fresh air in winter

[0041] In winter, the temperature and humidity of outdoor fresh air are lower than the lower limit of the preset temperature range of 19-24°C and humidity range of 40%-65%, so the central controller controls the compressor 31 of the outdoor unit 3 to turn off, so that the evaporation section 17 and the condensation heat recovery section 20 do not work.

[0042] After the outdoor fresh air is initially filtered by the fresh air primary filter section 11, it is blown to the subsequent sections through the fresh air fan section 12. After the fresh air passes through the medium efficiency filter section 13 and the sub-high efficiency filter section 14, it obtains relatively ideal air, and passes through the surface cooling section 16 and the reheat coil 19 to heat the fresh air. The reheating capacity of the reheat coil section 19 is much smaller than the operating power of the surface cooling section 16, and the adjustment accuracy is high and stable, so the reheat coil section 19 is turned on first. When the heating capacity of the reheat coil section 19 can raise the fresh air temperature to the preset temperature range, the surface cooling section 16 is not started; when the fresh air temperature is too low and the heating capacity of the reheat coil section 19 is insufficient, the surface cooling section 16 is turned on. The heat pipe circulation recovery front section 15, the heat pipe circulation recovery middle section 26 and the heat pipe circulation recovery rear section 18 form a closed loop, and the electric regulating three-way valve 182 is controlled by the central controller to realize the heating of the fresh air by recovering the heat of the indoor and outdoor exhaust bodies.

[0043] Because the humidification amount is smaller at low temperatures than at high temperatures, the room temperature is set to 19-24°C in winter. When the temperature is 19°C, the humidification amount is the smallest, and the energy consumption is also the smallest. The humidification section 21 performs isothermal humidification of the air. The central controller adjusts the working state of each section to achieve the preset temperature and humidity range with the highest exchange efficiency, and the energy saving rate is as high as 30%.

[0044] Example 2 Treatment of high temperature and high humidity outdoor fresh air in summer

[0045] The preset temperature range is 19-24℃ and the humidity range is 40%-65%. The high-temperature and high-humidity outdoor fresh air passes through the front end of the fresh air fan, is filtered by the fresh air primary filter section 11, is blown to the medium-efficiency filter section 13 and the sub-high-efficiency filter section 14 through the fresh air fan section 12 for further filtration, and then is recycled through the heat pipe front section 15 for heat exchange, cooled by the surface cooling section 16, and deeply cooled and dehumidified by the evaporation section 17. If the refrigerant in the condensation heat recovery section 20 cannot meet the cooling and dehumidification requirements of the evaporation section 17, the refrigerant is adjusted by adjusting the electronic regulating three-way valve 331 to enter the evaporation coil 171 from the refrigerant medium-pressure section 34 to further cool and dehumidify. If the cold amount in the refrigerant is fully recovered and still cannot reach the preset dehumidification range, the surface cooling section 16 is started to further cool down.

[0046] The temperature of the fresh air after cooling and dehumidification is lower than the set indoor temperature range and needs to be heated. The heat pipe circulation recovery front section 15, the heat pipe circulation recovery middle section 26 and the heat pipe circulation recovery rear section 18 form a closed loop, which can recycle the sensible heat in the air intake unit 1 and the exhaust unit 2. The fresh air is heated and raised by a certain amount through the heat pipe circulation recovery rear section 18, which becomes the first reheating. The fresh air after dehumidification and reheating passes through the condensation heat recovery section 20 for heat exchange to increase the fresh air temperature again. When the condensation heat is fully recovered and still cannot meet the air supply demand, the reheat coil section 19 connected to the air conditioning hot water system is turned on to further heat the fresh air to the set temperature range before the fresh air enters the room. Because the humidity of the fresh air is relatively high in summer, the humidification section 21 does not work.

[0047] The indoor and outdoor exhaust gas is initially filtered by the exhaust primary filter section 23 of the exhaust unit 2, and the harmful substances such as amines and nitrogen in the exhaust gas are removed by the water washing spray section 25. After the cold is recovered by the heat pipe circulation recovery middle section 26, it is discharged outdoors after being processed by the oxidation disinfection section 27, the activated carbon adsorption section 1 28, the activated carbon adsorption section 29 and the high-efficiency filtration section 30. The energy saving rate of the fresh air device is as high as 50%.

[0048] Example 3 Treatment of high humidity fresh air at an outdoor temperature of 36°C

[0049] The preset temperature range is 19-24℃ and the humidity range is 40%-65%. The outdoor fresh air temperature monitored by the fresh air inlet temperature sensor is 36℃, and the indoor temperature detected by the exhaust air inlet temperature sensor is 2325℃. The central controller controls the electronic regulating three-way valve to open the first outlet appropriately, and controls the second outlet of the electronic regulating three-way valve to close appropriately, so that the condensing heat recovery section coil 201 is connected to the refrigerant high-pressure section 33. The central controller controls the first outlet of the electric regulating three-way valve to open proportionally, and controls the second outlet of the electric regulating three-way valve to close proportionally, so that the ethylene glycol in the front section coil 151 of the heat pipe circulation recovery enters a circulating flow state.

[0050] After being filtered by the primary filter of the air inlet primary filter section 11, the fresh air is blown to the rear sections through the fresh air fan section 12, and then filtered by the medium efficiency filter section 13 and the sub-high efficiency filter section 14 before entering the heat pipe circulation recovery front section 15. Through heat exchange with the heat pipe circulation recovery front section coil 151, the fresh air temperature drops to 26-28°C. At this time, the temperature at the inlet end of the heat pipe circulation recovery front section coil 151 is 17-23°C. After heat exchange, the temperature at the outlet end of the heat pipe circulation recovery front section coil 151 is 25-27°C.

[0051] After the heat pipe circulation recovery front section 15, the fresh air flows through the surface cooling section 16 and enters the evaporation section 17 after being cooled. The refrigerant in the condensation heat recovery section 20 enters the evaporation coil 171 after being decompressed by the one-way two-way valve and the electronic pressure reducing valve 172 to evaporate and absorb heat. At the same time, the refrigerant is regulated by adjusting the electronic regulating three-way valve 331 to enter the evaporation coil 171 from the refrigerant medium pressure section 34 through the one-way two-way valve 341, and further cools and dehumidifies. The temperature of the fresh air after dehumidification in the evaporation section 17 drops to 9-11°C.

[0052] The fresh air dehumidified by the evaporation section 17 continues to flow through the heat pipe circulation recovery rear section 18. At this time, the temperature at the inlet end of the heat pipe circulation recovery rear section coil 181 is 1821°C. After heat exchange, the temperature at the outlet end of the heat pipe circulation recovery coil 181 drops to 13-18°C, and the temperature of the fresh air rises to 18°C ​​after passing through this section.

[0053] The fresh air after the heat pipe circulation recovery section 18 flows through the condensation heat recovery section 20, and the amount of high-pressure refrigerant flowing into the condensation heat recovery section coil 201 is adjusted by the electronic regulating three-way valve. Since the refrigerant releases heat during compression, it has a higher temperature and is used to heat the fresh air after cooling and dehumidification. If the fresh air temperature is too low and the condensation heat cannot heat the fresh air to the preset temperature range, the reheat coil section 19 connected to the air conditioning hot water system is turned on to assist in heating the fresh air. If the temperature of the fresh air after the heat pipe circulation recovery section 18 is lower than 13-18°C, the central controller will start the reheat coil section 19 to exchange heat with the fresh air to reach the set fresh air temperature. After treatment, the fresh air that reaches the preset temperature and humidity range is sent into the room.

[0054] The indoor air at about 24°C enters the exhaust unit 2, and passes through the exhaust primary filter section 23, the exhaust fan section 24 and the water washing spray section 25 in sequence. The water temperature of the water washing spray section is about 13-18°C or lower, and the temperature of the exhaust gas after passing through the water washing spray section 25 is 18-21°C. The exhaust gas after passing through the water washing spray section 25 continues to pass through the heat pipe circulation middle section 26, and the temperature rises to 22-27°C after heat exchange with the heat pipe circulation middle section coil. The temperature at the inlet end of the heat pipe circulation middle section coil is 25-27°C, and the temperature at the outlet end of the heat pipe circulation middle section coil is 18-21°C. The exhaust gas after the heat pipe circulation middle section 26 continues to pass through the oxidation disinfection section 27, the activated carbon filter section 1 28, the activated carbon filter section 29, and then is filtered by the high-efficiency filter section 30 and discharged to the outside. The energy saving rate of the fresh air device is as high as 50%.

[0055] In summary, this application makes full use of the processing advantages of each functional segment, sets the temperature and humidity range through the temperature and humidity preset module, combines the dynamic parameters of temperature and humidity of indoor gas and outdoor fresh air, uses the principle of heat absorption and heat release during evaporation of refrigerant, and reasonably utilizes the recovered heat. The temperature and humidity of the fresh air are adjusted through the central controller, which greatly reduces energy consumption. Since the temperature and humidity of outdoor fresh air in different regions and seasons vary greatly, by presetting the required indoor temperature and humidity, the central controller will compare the temperature and humidity of the fresh air monitored by the temperature and humidity sensor with the preset range, adjust the valves of each segment and the frequency of the outdoor compressor, thereby controlling the indoor temperature and humidity, and controlling the temperature and humidity stability of the incoming air on the basis of energy saving, so that the error between the fresh air temperature and the preset range is less than 0.5-1°C.

[0056] The above is only an embodiment of the present application, which is only used to help understand the present application and is not used to limit the protection scope of the present application. It should be pointed out that for those skilled in the art, several improvements made without departing from the principle of the present application should also be regarded as the protection scope of the present application.

Claims

1. An energy-saving fresh air device, characterized in that: It includes air intake unit, exhaust unit, external unit and automatic control system, including: The air intake unit includes a fresh air primary filter section, a fresh air fan section, a heat pipe circulation recovery front section, a surface cooling section, an evaporation section, a heat pipe circulation recovery rear section, a reheat coil section, a condensation heat recovery section and a humidification section in sequence from the fresh air inlet end to the fresh air outlet end; The exhaust unit includes, from the exhaust inlet end to the exhaust outlet end, an exhaust primary filter section, an exhaust fan section, a water washing spray section, a heat pipe circulation recovery middle section, an oxidation disinfection section, at least one activated carbon adsorption section and a high-efficiency filter section in sequence; The heat pipe circulation recovery front section, the heat pipe circulation recovery middle section and the heat pipe circulation recovery rear section form a closed loop to recover and utilize the sensible heat of the fresh air and the exhaust air; The external machine comprises a compressor, a condenser, a low-pressure refrigerant section, a medium-pressure refrigerant section and a high-pressure refrigerant section connected to the compressor, an electronic regulating three-way valve is arranged in the external machine, an inlet end of the electronic regulating three-way valve is connected to the compressor to receive the high-pressure refrigerant compressed by the compressor, a first outlet end of the electronic regulating three-way valve is connected to the condensation heat recovery section via the high-pressure refrigerant section, and a second outlet end of the electronic regulating three-way valve is connected to the medium-pressure refrigerant section via the condenser; The inlet end of the evaporation section is provided with a decompression device and is connected to the condensation heat recovery section and the refrigerant medium-pressure section, and the outlet end of the evaporation section is connected to the refrigerant low-pressure section; The automatic control system includes a central controller and a compressor frequency controller, a temperature and humidity preset module, a temperature and humidity sensor arranged at the fresh air inlet end, a temperature and humidity sensor installed at the exhaust air inlet end, and a switch controller arranged at each segment, which are respectively connected to the central controller. The central controller is used to compare the temperature range and humidity range preset by the temperature and humidity preset module with the temperature and humidity values ​​read by the temperature and humidity sensors at the fresh air inlet end and the temperature and humidity sensors at the exhaust air inlet end, and automatically adjust the working state of each segment.

2. The energy-saving fresh air device according to claim 1, characterized in that: The air intake unit also includes a medium-efficiency filter section and a sub-high-efficiency filter section which are sequentially arranged behind the fresh air fan section and in front of the heat pipe circulation recovery front section.

3. The energy-saving fresh air device according to claim 1, characterized in that: The switch controller arranged in each section includes an electric regulating three-way valve arranged on the pipeline connecting the middle section of the heat pipe circulation recovery and the rear section of the heat pipe circulation recovery, a proportional electric valve arranged on the surface cooling section, and control switches respectively arranged in the humidification section and the reheat coil section.

4. The energy-saving fresh air device according to claim 3, characterized in that: The front section of the heat pipe circulation recovery includes a front section coil of the heat pipe circulation recovery, the middle section of the heat pipe circulation recovery includes a middle section coil of the heat pipe circulation recovery, and the rear section of the heat pipe circulation recovery includes a rear section coil of the heat pipe circulation recovery; the inlet end of the electric regulating three-way valve is connected to the outlet end of the middle section coil of the heat pipe circulation recovery, the first outlet end of the electric regulating three-way valve is connected to the inlet end of the rear section coil of the heat pipe circulation recovery, the second outlet end of the electric regulating three-way valve is connected to the outlet end of the rear section coil of the heat pipe circulation recovery, the inlet end of the front section coil of the heat pipe circulation recovery is connected to the outlet end of the rear section coil of the heat pipe circulation recovery, and the inlet end of the middle section coil of the heat pipe circulation recovery is connected to the outlet end of the front section coil of the heat pipe circulation recovery; the front section coil of the heat pipe circulation recovery, the rear section coil of the heat pipe circulation recovery and the middle section coil of the heat pipe circulation recovery are filled with ethylene glycol liquid, and an ethylene glycol solution pump is provided on the pipeline connecting the inlet end of the middle section coil of the heat pipe circulation recovery and the outlet end of the front section coil of the heat pipe circulation recovery.

5. The energy-saving fresh air device according to claim 1, characterized in that: The evaporation section comprises an evaporation coil, and a drying filter is also arranged at the inlet end of the evaporation coil.

6. The energy-saving fresh air device according to claim 1, characterized in that: The condensing heat recovery section includes a condensing heat recovery section coil.

7. The energy-saving fresh air device according to claim 1, characterized in that: The energy-saving fresh air device also includes an electric auxiliary heating section installed behind the humidification section, and the switch controller arranged on each section body also includes a control switch arranged on the electric auxiliary heating section.

8. The energy-saving fresh air device according to claim 1, characterized in that: The pressure reducing device is an electronic pressure reducing valve.

9. The energy-saving fresh air device according to any one of claims 1 to 8, characterized in that: The preset temperature range is 19-24°C and the humidity range is 40%-65%.

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