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 field of air treatment technology, and in particular to an energy-saving fresh air device. Background Art

[0002] Air conditioning systems are designed to provide a controlled, comfortable, and healthy air environment for indoor activities or to provide specific air conditions for activities such as warehousing, processing, and equipment operation. Air conditioning primarily involves controlling air quality (dust particles and bacteria concentration), air temperature, air humidity, and wind speed.

[0003] A relatively natural and effective way to control air quality is to replace or dilute indoor air with fresh air from outside, that is, to inhale fresh air from outside and expel indoor gas. In existing fresh air systems, for fresh air in high-humidity environments, moisture in the fresh air is generally condensed through condensers to achieve the purpose of dehumidification and cooling of the fresh air. However, condensation and dehumidification will significantly reduce the temperature of the fresh air, generally below the desired indoor temperature. Electric heating or other heating methods are required to heat the low-temperature fresh air after condensation and dehumidification to a suitable temperature before it enters the room. Using a separate cold source to condense and dehumidify the moisture in the fresh air and then separately reheating or heating the dehumidified fresh air with electricity or other forms of heating to meet air supply conditions has problems such as high energy consumption, large fluctuations in temperature and humidity, and poor stability. Utility Model Content

[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 when the compressor compresses 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 better cooling and dehumidification effects. A temperature and humidity range is set by the 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 traditional fresh air treatment methods cannot solve.

[0005] In order to solve the technical problems existing in the prior art, the present application provides an energy-saving fresh air device, comprising an air intake unit, an exhaust unit, an outdoor unit and an automatic control system, wherein the air intake unit comprises 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 comprises 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 filtration section in sequence from the exhaust inlet end to the exhaust 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 outdoor unit comprises 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 outdoor 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 provided on the humidification section and the reheat coil section respectively.

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

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

[0010] In certain embodiments, the condensing heat recovery section includes 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 located at the front end of the air intake unit and the exhaust unit respectively, and a surface cooling section is set in front of the evaporation section), and sets the refrigerant medium-pressure section to connect to the inlet end of the evaporation section to further utilize the refrigerant's decompression and heat absorption to achieve better cooling and dehumidification effects. At the same time, the present application sets a temperature and humidity range through the 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 further 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 exponentially or even to zero), while extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present application will be further described below with reference to the accompanying drawings and examples. In the accompanying drawings:

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

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

[0019] Figure 3 This 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 refrigerant low-pressure section; 33 refrigerant high-pressure section; 331 electronic regulating three-way valve; 34 refrigerant medium-pressure section; 341 one-way two-way valve; 35 condenser. DETAILED DESCRIPTION

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

[0024] The key concept of this 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 automatically controls the working state of each section, making full use of 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 to initially filter dust in the fresh air. The fresh air fan section 12 is installed after the fresh air primary filter section 11 and in front of the other functional sections. It blows air to the functional sections in the rear section in the form of positive pressure, which easily overcomes the resistance of the functional sections in the rear section, reduces the power consumption of the fan, and maintains a stable wind speed. At the same time, installing it after the fresh air primary filter section 11 can reduce 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 dust in the fresh air.

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

[0028] The exhaust primary filter section 23 is used to initially filter dust in the exhaust air. The exhaust fan section 24 blows air to the downstream stage in the form of positive pressure, which can overcome the resistance of the functional sections in the downstream section and reduce energy consumption. The water washing and spraying section 25 can remove harmful substances such as amines and nitrogen from 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 passes through the high-efficiency filter of the high-efficiency filter section 30 to remove dust particles in the air before being discharged outdoors. The discharge height is greater than 35 meters.

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

[0030] The automatic control system includes a central controller for controlling the operation of each segment, a frequency controller for the compressor 31, a temperature and humidity preset module, a temperature and humidity sensor at the fresh air inlet, a temperature and humidity sensor at the exhaust air inlet, and switch controllers installed in each segment. The central controller automatically adjusts the operating state of each segment by comparing the temperature and humidity ranges 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 and the exhaust air inlet.

[0031] In the above-mentioned energy-saving fresh air device, the switch controllers installed in each section include an electric regulating three-way valve 182 installed 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 installed on the surface cooling section 16, and control switches respectively installed 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. A central controller regulates the proportional electric valve installed on the surface cooling coil 161 to adjust the fresh air temperature. When the intermediate-pressure refrigerant from the condensation heat recovery section 20 and the intermediate-pressure refrigerant section 34 cannot meet the cooling and dehumidification requirements of the evaporation section 17, the control system activates the surface cooling section 16 to provide auxiliary cooling.

[0033] An evaporator coil 171 is installed within the evaporator section 17. The inlet of the evaporator coil 171 is located at the upper portion of the evaporator section 17, while the outlet of the evaporator coil 171 is located at the lower portion of the evaporator section 17. The inlet of the evaporator coil 171 is also equipped with a filter drier 173 and an electronic pressure reducing valve 172, and is connected to the condensation heat recovery section 20 and the refrigerant intermediate-pressure section 34. The outlet of the evaporator section 17 is connected to the refrigerant low-pressure section 32. Low-pressure liquid refrigerant flows from the outlet of the evaporator coil 171 through the compressor low-pressure section 32 and returns to the compressor for a secondary power cycle.

[0034] In the energy-saving fresh air system described above, the reheat coil section 19 is connected to the air conditioning hot water system. If the fresh air, after circulating through the heat pipe recovery section 18, remains below a preset temperature range, the central controller opens the reheat coil section 19, allowing the air conditioning hot water to flow into the reheat coil section 19 for further heating of the fresh air.

[0035] In the above-mentioned energy-saving fresh air device, a condensing heat recovery coil 201 is also installed within the condensing heat recovery section 20. The outlet of the condensing heat recovery coil 201 is located at the upper portion of the condensing heat recovery section 20. A one-way two-way valve is installed at the outlet of the condensing heat recovery coil 201, which is connected to the inlet of the evaporating coil 171 via a pipe. A pipe connecting the refrigerant high-pressure section 33 and the inlet of the condensing heat recovery coil 201 is installed at the lower portion of the condensing heat recovery section 20. High-pressure refrigerant from the compressor flows through the high-pressure section 33 into the condensing heat recovery coil 201 within the condensing heat recovery section 20, where it heats the fresh air and becomes medium-pressure refrigerant. The refrigerant then passes through the electronic pressure reducing valve 172 and flows through the inlet of the evaporating coil 171 into the evaporating section 17, where it evaporates and absorbs heat, lowering the temperature of the evaporating coil 171. Moisture in the high-humidity fresh air condenses upon contact with the low-temperature evaporating coil 171, removing excess moisture from the air and thus achieving the effect of dehumidifying the fresh air. 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 condensing 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 is converted into medium-pressure refrigerant after dissipating heat through the outdoor unit condenser 35. The medium-pressure refrigerant flows into the evaporation section 17 through the refrigerant medium-pressure section 34 to further evaporate, absorb heat, cool and dehumidify. The flow direction of the high-pressure refrigerant can be adjusted by setting the electronic regulating three-way valve 331. The high-pressure refrigerant can directly enter the condensing heat recovery section coil 201 to exchange heat with the fresh air and heat the fresh air, or the high-pressure refrigerant can pass through the outdoor unit condenser 35 to become medium-pressure refrigerant and enter the evaporation section to absorb heat and cool the fresh air. This makes the above-mentioned energy-saving fresh air device suitable for fresh air treatment in different environments.

[0037] In the above-mentioned energy-saving fresh air device, the heat pipe recycling front section 15, the heat pipe recycling middle section 26, and the heat pipe recycling back section 18 form a closed loop to recycle the sensible heat of fresh air and exhaust air. The heat pipe recycling front section 15 includes a heat pipe recycling front section coil 151, the inlet and outlet of which are both located at the upper portion of the heat pipe recycling front section 15. The heat pipe recycling back section 18 includes a heat pipe recycling back section coil 181, the inlet and outlet of which are located at the upper portion of the heat pipe recycling back section. The heat pipe recycling middle section 26 includes a heat pipe recycling middle section coil, the inlet and outlet of which are located at the lower portion of the heat pipe recycling middle section. The heat pipe recycling front section coil 151, the heat pipe recycling back section coil 181, and the heat pipe recycling 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 via 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 via 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 up 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 are fully utilized, further saving energy. The electric regulating three-way valve 182 is used to control the coolant 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, making the above energy-saving fresh air device 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. The switch controller installed in each section also includes a control switch installed on the electric auxiliary heating section 22. The electric auxiliary heating section 22 only provides auxiliary heating. If the temperature of the fresh air still cannot reach the preset temperature range after being processed by the various sections of the air intake unit, the electric heating further adjusts the fresh air temperature to ensure the normal operation of the fresh air unit.

[0039] In the above energy-saving fresh air device, the temperature and humidity preset module sets the room temperature range to 19-24°C and the humidity range to 40%-65%. When the humidity in summer is within the range of 40%-65%, the humidity does not need to be adjusted. When the humidity is too high, the temperature is raised to the highest set point of 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 maintained at the lowest set point of 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 are reduced, and 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 fresh air temperature and humidity are within the set range, no further regulation is performed. Compared with setting a specific temperature and humidity value, the energy-saving fresh air device of this application maximizes the reduction of energy consumption.

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

[0041] In winter, the temperature and humidity of the outdoor fresh air are lower than the lower limit of the preset temperature range of 19-24°C and the humidity range of 40%-65%. Therefore, 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 preliminary filtration through the fresh air primary filter section 11, the outdoor fresh air is blown through the fresh air fan section 12 to the subsequent sections. After passing through the medium-efficiency filter section 13 and the sub-high-efficiency filter section 14, the fresh air is converted to relatively ideal air. This air is then heated by the surface cooling section 16 and the reheat coil 19. The reheating capacity of the reheat coil section 19 is much lower than the operating power of the surface cooling section 16, allowing for high regulation accuracy and stability. Therefore, the reheat coil section 19 is activated first. When the heating capacity of the reheat coil section 19 can raise the fresh air temperature to within the preset temperature range, the surface cooling section 16 is deactivated. 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 activated. The heat pipe recycling front section 15, the heat pipe recycling middle section 26, and the heat pipe recycling rear section 18 form a closed loop. The central controller controls the electrically adjustable three-way valve 182 to heat the fresh air by recovering heat from the indoor and outdoor exhaust gases.

[0043] Because humidification capacity is lower at lower temperatures than at higher ones, in winter, the room temperature is set between 19°C and 24°C. At 19°C, humidification capacity is minimized, and energy consumption is minimized. Humidification segment 21 provides isothermal humidification of the air. The central controller regulates the operating status of each segment to achieve the highest exchange efficiency within the preset temperature and humidity range, achieving energy savings of up to 30%.

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

[0045] The preset temperature range is 19-24°C and the humidity range is 40%-65%. The high-temperature, high-humidity outdoor fresh air passes through the front end of the above-mentioned fresh air blower, is filtered by the fresh air primary filter section 11, and is blown to the medium-efficiency filter section 13 and the sub-high-efficiency filter section 14 through the fresh air blower section 12 for further filtration. It then undergoes heat exchange through the heat pipe circulation recovery front section 15, is cooled by the surface cooling section 16, and is 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 regulated by adjusting the electronic regulating three-way valve 331 to flow from the refrigerant medium-pressure section 34 into the evaporation coil 171 for further cooling and dehumidification. If the preset dehumidification range cannot be reached after all the cold in the refrigerant is recovered, the surface cooling section 16 is activated for further cooling.

[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 increased 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, which once again increases the fresh air temperature. 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] Indoor and outdoor exhaust gases are initially filtered by the exhaust primary filter section 23 of exhaust unit 2. Harmful substances such as amines and nitrogen are removed from the exhaust gases by the water washing and spraying section 25. The gases are then recycled by the heat pipe recycling section 26 to recover cold air. After processing through the oxidation disinfection section 27, activated carbon adsorption section 1 28, activated carbon adsorption section 29, and high-efficiency filtration section 30, they are finally discharged outdoors. The fresh air system offers energy savings of up to 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°C and the humidity range is 40%-65%. The outdoor fresh air temperature detected by the fresh air inlet temperature sensor is 36°C, and the indoor temperature detected by the exhaust air inlet temperature sensor is 23-25°C. The central controller controls the electronic regulating three-way valve to open the first outlet appropriately, and at the same time controls the electronic regulating three-way valve to close the second outlet appropriately, so that the condensing heat recovery section coil 201 is connected to the refrigerant high-pressure section 33. The central controller controls the electric regulating three-way valve to open the first outlet proportionally, and at the same time controls the electric regulating three-way valve to close the second outlet 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 the fresh air is filtered by the primary filter of the air inlet primary filter section 11, it 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] Fresh air flowing through heat pipe recycling front section 15 is cooled by surface cooling section 16 before entering evaporation section 17. Refrigerant in condensation heat recovery section 20 is depressurized by a two-way one-way valve and electronic pressure reducing valve 172 before entering evaporation coil 171 for evaporation and absorption. Simultaneously, electronic regulating three-way valve 331 regulates the flow of refrigerant through two-way one-way valve 341, from the refrigerant intermediate pressure section 34, and into evaporation coil 171, further reducing the temperature and dehumidifying the air. After dehumidification in evaporation section 17, the fresh air temperature drops to 9-11°C.

[0052] The fresh air dehumidified by the evaporation section 17 continues to flow through the heat pipe circulation recovery section 18. At this time, the temperature at the inlet end of the heat pipe circulation recovery coil 181 is 18-21°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] Indoor air, at approximately 24°C, enters exhaust fan unit 2 and passes sequentially through exhaust primary filtration section 23, exhaust fan section 24, and water wash and spray section 25. The water temperature in the water wash and spray section is approximately 13-18°C or lower, and the exhaust air after passing through water wash and spray section 25 is 18-21°C. The exhaust air continues through heat pipe circulation section 26, where it undergoes heat exchange with the heat pipe coils, raising its temperature to 22-27°C. The temperature at the coil inlet is 25-27°C, and the outlet temperature is 18-21°C. The exhaust air from heat pipe circulation section 26 continues through oxidation disinfection section 27, activated carbon filtration section 1 28, activated carbon filtration section 29, and high-efficiency filtration section 30 before being discharged outdoors. The fresh air system achieves energy savings of up to 50%.

[0055] In summary, this application fully utilizes 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, utilizes the principle of heat absorption and heat release during evaporation of refrigerant, rationally utilizes the recovered heat, and adjusts the temperature and humidity of the fresh air through the central controller, thereby greatly reducing energy consumption. Since the temperature and humidity of outdoor fresh air vary greatly in different regions and seasons, by presetting the required indoor temperature and humidity, the central controller will compare the fresh air temperature and humidity 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 <0.5-1°C.

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

Claims

1. An energy-saving fresh air device, characterized in that: It includes air intake unit, exhaust unit, outdoor unit and automatic control system, including: The air intake unit includes, from the fresh air inlet end to the fresh air outlet end, 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; 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 and spraying section, a heat pipe circulation recovery section, an oxidation and disinfection section, at least one activated carbon adsorption section and a high-efficiency filter section; 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 and utilize the sensible heat of fresh air and exhaust air; The external unit includes 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 provided in the external unit. The inlet end of the electronic regulating three-way valve 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 high-pressure refrigerant section, and the 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 in communication with the condensation heat recovery section and the refrigerant medium-pressure section, and the outlet end of the evaporation section is in communication with 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 sensor at the fresh air inlet end and the temperature and humidity sensor at the exhaust air inlet end, and automatically adjust the working status of each segment.

2. The energy-saving fresh air device according to claim 1, characterized in that: The air intake unit further comprises 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 controllers provided in each section include 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 provided on the humidification section and the reheat coil section respectively.

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

5. The energy-saving fresh air device according to claim 1, characterized in that: The evaporation section includes an evaporation coil, and a drying filter is further provided 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 further includes an electric auxiliary heating segment installed behind the humidifying segment, and the switch controller provided on each segment further includes a control switch provided on the electric auxiliary heating segment.

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℃, and the humidity range is 40%-65%.

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