Fresh air processing unit

Abstract

A fresh air processing unit comprises an air inlet unit and a dehumidification function section. The air inlet unit sequentially comprises a fresh air primary filtering section, a fan section, a flow dividing section, a heat pipe circulation recycling front section, a surface cooling section, an evaporation section, a heat pipe circulation recycling rear section, an air mixing section, a reheating coil section and a humidifying section from the fresh air inlet end to the fresh air outlet end. The flow dividing section comprises a flow dividing channel and a main channel, and the flow dividing channel can enable part of fresh air to cross the heat pipe circulation recovery front section, the surface cooling section, the evaporation section and the heat pipe circulation recovery rear section to be mixed with fresh air passing through the main channel of the heat pipe circulation recovery front section, the surface cooling section, the evaporation section and the heat pipe circulation recovery rear section in the air mixing section. The resistance of fresh air passing through the fresh air processing unit section body is reduced, energy consumption is reduced, meanwhile, the fresh air passing through the flow dividing channel of the flow dividing section can be mixed with the fresh air passing through the main channel in the air mixing section, the temperature and humidity of the fresh air are adjusted, and the operation energy consumption of the fresh air processing unit is further reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air treatment, and in particular to a fresh air treatment unit. Background Art

[0002] Medical care is an important and indispensable part of people's survival. At present, higher requirements are put forward for the safety of medical products and drugs, and higher standards are also put forward for the production of medical drugs. The control of the production environment in the production process of medical drugs is extremely strict. The regulation of air in the production environment mainly includes the control of air quality (dust particles, bacterial concentration), air temperature, air humidity, wind speed, air gas flow direction, pressure difference, etc. At the same time, energy consumption under high requirements should also be considered, and high energy consumption is not allowed to be used in exchange for development space.

[0003] At present, the more natural and effective method of environmental control is to use outdoor fresh air to replace or dilute indoor air in a certain proportion to maintain the indoor oxygen content within a reasonable range, forming a very comfortable and clean environment, that is, to inhale part of the outdoor fresh air to form indoor positive pressure, and discharge part of the indoor gas while maintaining the indoor positive pressure. The existing fresh air handling units are composed of multiple functional sections. The fresh air passes through each functional section in turn to adjust the temperature and humidity before entering the room, which increases the operating energy consumption of the fresh air handling unit. Therefore, how to further reduce the energy consumption of the fresh air handling unit is a technical problem that needs to be solved. Summary of the invention

[0004] In order to solve the technical problem of high energy consumption of existing fresh air handling units, the present application provides a fresh air handling unit for adjusting the temperature and humidity of fresh air, including an air intake unit and a dehumidification functional section, wherein the air intake unit includes a fresh air primary filtration section, a fan section, a diversion section, a heat pipe circulation recovery front section, a surface cooling section, an evaporation section, a heat pipe circulation recovery rear section, an air mixing section, a reheat coil section and a humidification section from the fresh air inlet end to the fresh air outlet end; wherein the heat pipe circulation recovery front section and the heat pipe circulation recovery rear section form a closed loop to recycle the sensible heat of the fresh air; the dehumidification functional section includes a compressor, a condenser, a refrigerant low-pressure pipe connection, a refrigerant medium A compression pipe, a refrigerant high-pressure pipe connecting the compressor and the condenser inlet; the evaporator section inlet is provided with a pressure reducing device and is connected to the condenser outlet via the refrigerant medium-pressure pipe, and the evaporator section outlet is connected to the compressor via the refrigerant low-pressure pipe; the diversion section includes a main channel and a diversion channel, the main channel of the diversion section is connected to the mixed air section via the heat pipe circulation recovery front section, the surface cooling section, the evaporator section and the heat pipe circulation recovery rear section, and the diversion channel of the diversion section spans the heat pipe circulation recovery front section, the surface cooling section, the evaporator section and the heat pipe circulation recovery rear section and is connected to the mixed air section in a bridging manner.

[0005] According to the above technical scheme, a diversion channel is set in the diversion section of the fresh air handling unit by adopting a bridging method, so that part or all of the fresh air can avoid the sections that do not participate in the fresh air treatment and enter the mixed air section through the diversion channel in the transition season or winter, thereby reducing the resistance of the fresh air passing through the fresh air handling unit and reducing energy consumption. At the same time, the fresh air passing through the diversion channel of the diversion section can be mixed with the low-temperature and low-humidity fresh air treated by the main channel of the diversion section and the subsequent sections in the mixed air section to adjust the temperature and humidity of the fresh air, thereby further reducing the operating energy consumption of the fresh air handling unit.

[0006] In certain embodiments, the condenser is a water-cooled condenser. The heat generated by the functional section during dehumidification is removed by heat exchange with chilled water in the water-cooled condenser, and the heat dissipation is stable without being affected by the environment, and the dehumidification effect is more stable. At the same time, the installation space is reduced, the installation length of the unit pipeline is reduced, and the installation becomes easier. In addition, by adjusting the flow rate of medium-temperature chilled water, the unit can always be kept in the highest energy-efficient working state.

[0007] In certain embodiments, the air intake unit further includes a medium efficiency filter section disposed before the diversion section and after the fan section, and a sub-high efficiency filter section disposed before the reheat coil section and after the air mixing section.

[0008] In some embodiments, the air intake unit further includes a flow balancing section arranged before the medium efficiency filter section and after the fan section. The flow balancing section allows the fresh air to pass through the medium efficiency filter section evenly, effectively filters the air, improves air treatment efficiency, and protects the filter.

[0009] In some embodiments, a one-way air valve is provided at the outlet end of the diversion channel of the diversion section, and a one-way air valve is provided at the outlet end of the heat pipe circulation recovery rear section. The one-way air valve is used to control the flow direction of the fresh air, so that the fresh air flows from the inlet end to the outlet end, and prevents the phenomenon of insufficient air supply or no air supply caused by backflow.

[0010] In some embodiments, the fresh air handling unit further includes an automatic control system, which 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 arranged indoors, and a switch controller arranged at each segment, wherein the central controller is used to compare 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 sensor at the fresh air inlet end and the temperature and humidity sensor indoors, and automatically adjust the fresh air ratio in the shunt channel and the main channel of the shunt section and the working state of each other segment. According to the above embodiment, the indoor temperature and humidity range is preset by the automatic control system, and the fresh air ratio of the main channel and the shunt channel of the shunt section is dynamically adjusted according to the indoor and outdoor temperature and humidity ranges, so as to more intelligently reduce resistance and energy consumption, thereby overcoming the high energy consumption problem caused by the fact that the fresh air in the existing fresh air device must pass through each functional segment before entering the room under any circumstances. In addition, the sensible heat of the outdoor fresh air can be more reasonably utilized, so that the fresh air in the shunt channel is mixed with the fresh air in the main channel to adjust the fresh air temperature and humidity. As long as the fresh air temperature and humidity are within the set range, the fresh air can be controlled to enter the mixed air section through the diversion channel. At the same time, the working status of each section between the diversion section and the mixed air section will no longer be adjusted, so that the entire unit always works in a constant cold and hot state, thereby minimizing energy consumption and extending the service life of the equipment.

[0011] In certain embodiments, the switch controller disposed in each section further includes a diverter channel air volume regulating valve disposed in the diverter channel of the diverter section and a main channel air volume regulating valve disposed in the main channel of the diverter section, a proportional electric valve disposed on the surface cooling section, and control switches respectively disposed on the reheat coil section and the humidification section.

[0012] In certain embodiments, the preset temperature range is 19-24° C., and the humidity range is 40%-65%.

[0013] The present application also provides a combined air handling unit, which includes, from the fresh air inlet to the fresh air outlet, the aforementioned fresh air handling unit including an automatic control system, a pre-cooling purification circulation treatment unit for adjusting the fresh air temperature, and one or more fan filter units for pressurizing and filtering the fresh air.

[0014] In certain embodiments, the automatic control system in the fresh air handling unit is connected to the pre-cooling purification cycle treatment unit and the fan filter unit, and is used to automatically adjust the working status of relevant sections in the pre-cooling purification cycle treatment unit and the one or more fan filter units. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present application is further described below in conjunction with the accompanying drawings and embodiments. In the accompanying drawings:

[0016] Figure 1 It is a structural schematic diagram of the fresh air handling unit;

[0017] Figure 2 This is a specific structural cross-sectional diagram of the fresh air handling unit;

[0018] Figure 3 This is a structural cross-section diagram of a combined air handling unit.

[0019] Description of reference numerals:

[0020] 1 Fresh air handling unit; 10 Air intake unit; 101 Fresh air primary filtration section; 102 Fan section; 103 Flow equalization section; 104 Medium efficiency filtration section; 105 Diversion section; 1051 Diversion channel air volume regulating valve; 1052 Main channel air volume regulating valve; 106 Heat pipe circulation recovery front section; 1061 Heat pipe circulation recovery front section coil; 107 Surface cooling section; 108 Evaporation section; 1081 Evaporation coil; 1082 Drying filter ; 1083 electronic pressure reducing valve; 109 heat pipe circulation recovery rear section; 1091 heat pipe circulation recovery rear section coil; 110 air mixing section; 1101 one-way air valve; 111 sub-high efficiency filter section; 112 reheat coil section; 113 humidification section; 20 dehumidification function section; 201 variable frequency compressor; 202 refrigerant low pressure pipe; 203 refrigerant high pressure pipe; 204 water-cooled condenser; 205 refrigerant medium pressure pipe;

[0021] 2 Pre-cooling purification cycle treatment unit (PAU); 3 Fan filter unit (FFU). DETAILED DESCRIPTION

[0022] 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.

[0023] The key concept of the present application is to provide a fresh air handling unit, which allows part or all of the fresh air in the transition season or winter to avoid the sections that do not participate in the fresh air treatment by setting a diversion channel in the diversion section of the fresh air handling unit, thereby reducing the resistance of the fresh air passing through the fresh air handling unit and reducing energy consumption. At the same time, the fresh air passing through the diversion channel can be mixed with the low-temperature and low-humidity fresh air after being treated by the main channel of the diversion section and each section in the mixed air section, which is used for adjusting the temperature and humidity of the fresh air, thereby further reducing the operating energy consumption of the fresh air handling unit.

[0024] like Figure 1 and Figure 2As shown, the air intake unit 10 of the fresh air handling unit 1 includes, from the fresh air inlet end to the fresh air outlet end, a fresh air primary filtration section 101, a fan section 102, a flow equalization section 103, a medium efficiency filtration section 104, a diversion section 105, a heat pipe circulation recovery front section 106, a surface cooling section 107, an evaporation section 108, a heat pipe circulation recovery rear section 109, an air mixing section 110, a sub-high efficiency filtration section 111, a reheat coil 112, and a humidification section 113, wherein the heat pipe circulation recovery front section 106 and the heat pipe circulation recovery rear section 109 form a closed loop to recycle the sensible heat of the fresh air.

[0025] The fresh air primary filter section 101 is used to perform preliminary filtration on the fresh air. The fan section 102 pressurizes the fresh air and speeds up the fresh air flow. The flow-averaging section 103 allows the fresh air to pass through the medium-efficiency filter section 104 evenly, effectively filtering the air, improving the air treatment efficiency, and protecting the filter. The medium-efficiency filter section 104 is used to filter the fresh air for fine pollutant particles.

[0026] The main channel in the diversion section 105 is installed with a main channel air volume regulating valve 1052, and the diversion channel is installed with a diversion channel air volume regulating valve 1051. A one-way air valve 1101 is installed at the outlet end of the diversion channel of the diversion section 105 and the outlet end of the heat pipe circulation recovery rear section 109 to prevent the phenomenon of insufficient air volume or no air delivery caused by short-circuiting of the air outlet. The central controller adjusts the fresh air volume in the main channel and the diversion channel by adjusting the opening amplitude of the main channel air volume regulating valve 1052 and the diversion channel air volume regulating valve 1051, while making the system more stable and reliable while minimizing energy consumption. When the fresh air does not need to be cooled and dehumidified, the central controller controls the diversion channel air volume regulating valve 1051 to open and the main channel air volume regulating valve 1052 to close, so that the fresh air passes through the diversion channel across the relevant sections of cooling and dehumidification in the fresh air handling unit, reducing the passage resistance and energy consumption. By adjusting the main channel air volume regulating valve 1052 and the bypass channel air volume regulating valve 1051, the insufficient function of the unit during cooling and dehumidification can be compensated. For example, in the transition season, the temperature and humidity of the outdoor fresh air are slightly higher than the preset temperature and humidity range, the unit is in a dehumidification state, and the frequency of the variable frequency compressor 201 has been adjusted to the minimum but still causes excessive dehumidification of the fresh air, resulting in low humidity. By properly opening the bypass channel air volume regulating valve 1051, part of the high-temperature and high-humidity fresh air is mixed with the fresh air after cooling and dehumidification in the main channel in the mixing section 110 after passing through the bypass channel, and the temperature and humidity of the fresh air are adjusted to achieve the purpose of reducing energy consumption. At the same time, it also reduces the accuracy requirements for the automatic control system, reduces the frequent starting and stopping of the variable frequency compressor 201, and reduces the risk of accelerated aging of equipment while reducing energy consumption.

[0027] The heat pipe circulation recovery front section 106 and the heat pipe circulation recovery rear section 109 form a closed loop. The heat pipe circulation recovery front section 106 includes a heat pipe circulation recovery front section coil 1061, and the heat pipe circulation recovery rear section 109 includes a heat pipe circulation recovery rear section coil 1091. The heat pipe circulation recovery front section coil 1061 and the heat pipe circulation recovery rear section coil 1091 are filled with refrigerant. A refrigerant circulation pump is provided on the pipeline connecting the heat pipe circulation recovery front section 106 and the heat pipe circulation recovery rear section 109. The closed loop can transfer the recovered cold capacity to the heat pipe circulation recovery front section 106 through the refrigerant and the refrigerant circulation pump for pre-cooling of high-temperature fresh air, and at the same time, bring the outdoor fresh air heat recovered by the heat pipe circulation recovery front section 106 into the heat pipe circulation recovery rear section 109 for heating and heating the fresh air.

[0028] The surface cooling section 107 is equipped with a surface cooling coil, which is connected to the air conditioning cold (hot) water system to adjust the fresh air temperature and cooperate with the evaporation section for dehumidification. When the fresh air temperature and humidity are high, and the maximum cooling capacity of the evaporation section 108 is insufficient to reduce the fresh air temperature below the dew point, the surface cooling section 107 is activated to assist in cooling and dehumidification. When the humidity is within the set range but the temperature is too high, the evaporation section 108 is not activated and only the surface cooling section 107 is activated for cooling.

[0029] like Figure 2 As shown, the dehumidification functional section 20 includes a variable frequency compressor 201, a water-cooled condenser 204, a refrigerant low-pressure pipe 202, a refrigerant medium-pressure pipe 205, and a refrigerant high-pressure pipe 203 connecting the variable frequency compressor 201 and the water-cooled condenser 204. The water-cooled condenser 204 is provided with a water-cooled condensing coil and a medium-temperature chilled water inlet and a medium-temperature chilled water outlet. The condensation heat released when the variable frequency compressor 201 compresses the refrigerant is taken away in the form of chilled water heat exchange in the water-cooled condenser 204, and the heat generated by the functional section during dehumidification is taken away in the form of water. The heat dissipation is stable and is not affected by the environment. The dehumidification effect is also more stable. At the same time, the installation space is reduced, the installation length of the unit pipeline is reduced, and the installation becomes easier. By adjusting the flow rate of the medium-temperature chilled water, the unit can always operate at the highest energy efficiency state.

[0030] An evaporation coil 1081 is installed in the evaporation section 108. A one-way valve, a drying filter 1082 and an electronic pressure reducing valve 1083 are provided at the inlet end of the evaporation coil 1081. The inlet end of the evaporation coil 1081 is connected to the outlet end of the water-cooled condenser 204 through the refrigerant medium-pressure pipe 205. The high-pressure refrigerant compressed by the variable frequency compressor 201 flows into the water-cooled condenser 204 through the refrigerant high-pressure pipe 203 and enters the evaporation coil 1081 through the refrigerant medium-pressure pipe 205 after heat dissipation. The outlet end of the evaporation coil 1081 is connected to the variable frequency compressor 201 through the refrigerant low-pressure pipe 202, and the low-pressure refrigerant generated after evaporation and heat absorption returns from the evaporation section 108 to the variable frequency compressor 201 in the functional dehumidification section 20 through the refrigerant low-pressure pipe 202. The inlet end and the outlet end of the evaporation coil 1081 are both arranged at the lower part of the evaporation section 108.

[0031] The air mixing section 110 is used to mix the fresh air flowing through the shunt channel and the main channel. The sub-high efficiency filter section 111 is used to further filter the fresh air. The reheat coil installed in the reheat coil section 112 is connected to the air conditioning hot water system to heat the fresh air. The reheating capacity of the reheat coil section 112 is much smaller than the power of the surface cooling section 107, and the adjustment accuracy is high. When the heating capacity of the reheat coil section 112 is insufficient, the surface cooling section 107 is used to heat and increase the temperature of the fresh air. A steam humidification spray pipe is installed in the humidification section 113 for humidifying the fresh air.

[0032] The above-mentioned fresh air handling unit also includes an automatic control system, which 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 arranged indoors, and a switch controller arranged in each section, which are respectively connected to the central controller. The central controller is used to compare 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 sensor at the fresh air inlet end and the temperature and humidity sensor indoors, and automatically adjust the fresh air ratio in the diversion channel and the main channel of the diversion section and the working status of other sections.

[0033] The switch controllers provided in each section further include a shunt channel air volume regulating valve 1051 provided in the shunt channel of the shunt section, a main channel air volume regulating valve 1052 provided in the main channel of the shunt section, a proportional electric valve provided on the surface cooling section 107, and control switches provided on the reheat coil section 112 and the humidifying section 113. The automatic control system adjusts the opening amplitude of the shunt channel air volume regulating valve 1051 and the main channel air volume regulating valve 1052 to adjust the fresh air volume entering the shunt channel and the main channel, and at the same time adjusts the working state of other sections in the fresh air handling unit, so as to achieve the effect of reducing the energy consumption of the fresh air handling unit.

[0034] In the above-mentioned fresh air treatment unit, the air intake unit 10 also includes an air outlet section, and an air volume regulating valve is installed in the air outlet section to adjust the air volume entering the pre-cooling purification cycle treatment unit 2.

[0035] like Figure 3 As shown, the fresh air treated by the fresh air treatment unit 1 is distributed as needed through the air volume regulating valve and sent to the pre-cooling purification circulation treatment unit (PAU) 2 through the fresh air supply duct to mix with the return air, and the mixed fresh air is cooled or heated again according to the temperature of the return air. The pre-cooling purification circulation treatment unit 2 only adjusts the temperature of the fresh air and does not perform dehumidification. The mixed fresh air treated by the pre-cooling purification circulation treatment unit 2 is sent to the fan filter unit (FFU) 3 through the air supply duct for pressurized filtration, and then the mixed fresh air that meets the process requirements such as cleanliness, pressure gradient, temperature, humidity, and air flow type is sent to the room. Part of the indoor gas then flows back to the pre-cooling purification circulation treatment unit 2 through the return air port on the wall or the ground to complete the entire system cycle, and the other part of the indoor gas is discharged to the outside through the exhaust unit (not shown in the figure).

[0036] The automatic control system in the above-mentioned fresh air treatment unit 1 is connected to the pre-cooling purification cycle treatment unit 2 and the fan filter unit 3, and is used to control the working status of relevant sections in the pre-cooling purification cycle treatment unit 2 and the fan filter unit 3.

[0037] In the above-mentioned fresh air handling unit 1, the temperature range preset by the temperature and humidity preset module is 19-24°C, and the humidity range is 40%-65%. Since the temperature and humidity of outdoor fresh air vary greatly in different regions and seasons, the automatic control system dynamically tracks the temperature and humidity by presetting the indoor temperature and humidity range. When the indoor temperature and humidity and the outdoor fresh air are within the temperature and humidity range, for example, the temperature and humidity of the outdoor fresh air in the transition season are mostly within the set range, the fresh air is controlled to enter the mixed air section through the diversion channel of the diversion section without adjusting the temperature and humidity; when the temperature and humidity of the outdoor fresh air are not within the set range, the opening amplitude of the diversion channel air volume regulating valve 1051 and the main channel air volume regulating valve 1052 is adjusted on the basis of energy saving, and the temperature and humidity of the indoor air are maintained within the set range by coordinating the adjustment of other sections, thereby maximizing the reduction of energy consumption.

[0038] Example 1: Fresh air treatment unit treats low-temperature and low-humidity outdoor fresh air in winter

[0039] 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℃ and the humidity range of RH40%-65%. The central controller controls the variable frequency compressor 201 of the dehumidification function section 20 to turn off, and the evaporation section 108 does not work. The central controller controls the refrigerant circulation pump to gradually reduce the speed, so that the refrigerant in the front section coil 1061 of the heat pipe circulation recovery and the rear section coil 1091 of the heat pipe circulation recovery enter a static state.

[0040] After being filtered by the fresh air primary filter section 101, the outdoor fresh air is blown to the equalizing section 103 by the fan in the fan section 102. The fresh air passing through the equalizing section 103 is evenly filtered by the medium-efficiency filter section 104. When the heat of the reheat coil section 112 can make the fresh air reach the preset temperature range, the reheat coil section 112 is started, and the surface cooling section 107 is not started. At this time, the central controller controls the diversion channel air volume regulating valve 1051 in the diversion channel to open and controls the main channel air volume regulating valve 1052 to close, and the fresh air enters the mixed air section 110 through the diversion channel. When the outdoor fresh air temperature is low, the heat of the reheat coil section 112 cannot make the fresh air reach the preset temperature range. At this time, the central controller controls the diversion channel air volume regulating valve 1051 and the main channel air volume regulating valve 1052 in the diversion channel to partially open, so that part of the fresh air is heated by the surface cooling section 107 in the main channel and reaches the mixed air section 110, and the other part of the fresh air enters the mixed air section 110 through the diversion channel. After being mixed in the air mixing section 110, the fresh air is further filtered through the sub-high efficiency filter section 111 and heated by the reheat coil section 112, and finally the fresh air temperature is raised to 19°C and kept constant. The humidification section 113 performs isothermal humidification on the fresh air, and the temperature guarantees the minimum humidification amount at 19°C and the energy consumption is also the minimum. The fresh air is humidified by the humidification section 113 to reach the preset temperature and humidity range and then sent into the room. The central controller adjusts the working state of each section to reach the preset temperature and humidity range with the highest exchange efficiency, and the energy saving rate of the fresh air handling unit is as high as 20%.

[0041] Example 2: Fresh air treatment unit processes fresh air with outdoor temperature of 27°C and humidity of 75%.

[0042] The preset indoor temperature range is 19-24℃ and the humidity range is RH40%-65%. When the outdoor fresh air temperature is 27℃ and the humidity is 75%, the fresh air needs to be cooled and dehumidified. The central controller controls the variable frequency compressor 201 of the dehumidification function section 20 to run at the lowest frequency. The high-pressure refrigerant compressed by the variable frequency compressor 201 flows into the water-cooled condenser 204 through the refrigerant high-pressure pipe 203 to dissipate heat, and then flows into the evaporation section 108 through the one-way valve, the drying filter 1082 and the electronic pressure reducing valve 1083. The low-pressure refrigerant after passing through the evaporation section 108 flows back to the variable frequency compressor 201 through the refrigerant low-pressure pipe 202. At this time, the refrigerant circulation pump gradually increases the speed, so that the refrigerant in the front section coil 1061 of the heat pipe circulation recovery and the rear section coil 1091 of the heat pipe circulation recovery enters the flow state.

[0043] After being filtered by the fresh air primary filter section 101, the outdoor fresh air is blown to the flow-equalizing section 103 by the fan of the fan section 102. The fresh air passing through the flow-equalizing section 103 is evenly filtered by the medium-efficiency filter section 104. Because the temperature and humidity of the outdoor fresh air are close to the preset range, when the compressor is kept running stably at the lowest frequency without stopping (the shutdown protection time of more than 3-5 minutes after the compressor stops will affect the humidity regulation, and the frequent start and stop of the compressor will increase energy consumption and shorten the life of the equipment), the humidity of the fresh air entering the evaporation section 108 for dehumidification through the main channel will still be lower than the lower limit of the preset range. At this time, the central controller controls the air volume regulating valve 1051 of the shunt channel and the air volume regulating valve 1052 of the main channel to be properly opened, so that part of the fresh air passes through the shunt channel to reach the mixed air section 110, and the other part of the fresh air enters the mixed air section 110 after the heat pipe circulation recovery front section 106 of the main channel recovers heat, the evaporation section 108 cools and dehumidifies, and the heat pipe circulation recovery rear section 109 recovers cold (the surface cooling section does not work at this time). The high-temperature and high-humidity fresh air passing through the shunt channel and the low-temperature and low-humidity fresh air processed through the main channel are mixed in the air mixing section 110, and the temperature and humidity of the mixed fresh air can reach the preset range. The mixed fresh air is filtered through the sub-high efficiency filter section 111 and then sent into the room after passing through the reheat coil section and the humidification section. At this time, the reheat coil section and the humidification section are not working. The energy saving rate of the fresh air treatment unit is as high as 50%.

[0044] Example 3: Fresh air treatment unit treats high temperature and high humidity outdoor fresh air in summer

[0045] The preset indoor temperature range is 19-24℃, and the humidity is RH40%-65%. The central controller compares the temperature and humidity monitored by the temperature and humidity sensor at the fresh air inlet end with the preset range, and adjusts the frequency of the variable frequency compressor 201 in the dehumidification function section 20. The high-pressure refrigerant compressed by the variable frequency compressor 201 flows into the water-cooled condenser 204 through the refrigerant high-pressure pipe 203 to dissipate heat, and then flows into the evaporation section 108 through the refrigerant medium-pressure pipe 205, and then flows through the one-way valve, the drying filter 1082 and the electronic pressure reducing valve 1083. The low-pressure refrigerant after passing through the evaporation section 108 flows back to the variable frequency compressor 201 through the refrigerant low-pressure pipe 202. At this time, the refrigerant circulation pump gradually increases the speed, so that the refrigerant in the front section coil 1061 of the heat pipe circulation recovery and the rear section coil 1091 of the heat pipe circulation recovery enters the flow state.

[0046] After being filtered by the fresh air primary filter section 101, the outdoor high-temperature and high-humidity fresh air enters the fan section 102 and is blown to the equalizing section 103 by the fan. The fresh air passing through the equalizing section 103 is evenly filtered through the medium-efficiency filter section 104. The central controller controls the air volume regulating valve 1051 of the diversion channel to be closed and the air volume regulating valve 1052 of the main channel to be opened. At this time, all the outdoor fresh air passes through the main channel through the heat pipe circulation recovery front section 106 to recover heat, the surface cooling section 107 to cool down (when the evaporation section 108 still cannot meet the cooling and dehumidification requirements at the maximum cooling capacity, the surface cooling section 107 is opened to assist the evaporation section in cooling and dehumidification to meet and achieve the dehumidification effect), the evaporation section 108 is cooled and dehumidified, and the heat pipe circulation recovery rear section 109 recovers cold energy and then enters the mixed air section 110. The fresh air after cooling and dehumidification is further filtered through the sub-high efficiency filter section 111, and is heated and heated by the reheat coil section 112 before being sent indoors. At this time, the central controller controls the humidification section 113 to be closed, and there is no need to humidify the fresh air. The energy saving rate of the fresh air processing unit is as high as 50%.

[0047] Example 4 Combined air handling unit processes outdoor high humidity fresh air at 36°C

[0048] The preset indoor temperature range is 19-24℃, and the humidity RH is 40%-65%. The central controller adjusts the frequency of the variable frequency compressor 201 in the dehumidification function section 20. The high-pressure refrigerant compressed by the variable frequency compressor 201 flows into the medium-pressure liquid refrigerant formed after the water-cooled condenser 204 dissipates heat through the refrigerant high-pressure pipe 203, passes through the refrigerant medium-pressure pipe 205, and then flows into the evaporation section 108 after decompression treatment through the one-way valve, the drying filter 1082, and the electronic pressure reducing valve 1083 to evaporate and absorb heat. The low-pressure refrigerant after passing through the evaporation section 108 flows back to the variable frequency compressor 201 through the refrigerant low-pressure pipe 202. At this time, the refrigerant circulation pump gradually increases the speed, so that the refrigerant in the front section coil 1061 of the heat pipe circulation recovery and the rear section coil 1091 of the heat pipe circulation recovery enters the flow state.

[0049] After being filtered by the primary filter section 101, the outdoor fresh air enters the fan section 102 and is blown to the equalizing section 103 by the fan. The fresh air passing through the equalizing section 103 is evenly filtered by the medium-efficiency filter section 104. The fresh air filtered by the medium-efficiency filter section 104 enters the heat pipe circulation recovery front section 106 for the first pre-cooling and cooling, with a cooling range of about 6-9°C; the medium-temperature and high-humidity fresh air after cooling enters the surface cooling section 107 and is further cooled by the evaporation section 108, so that a large amount of moisture in the fresh air is cooled to the dehumidification dew point and condensed and separated on the outer wall of the evaporation coil 1081, achieving the purpose of fresh air dehumidification. The condensed water flows along the evaporation coil to the water reservoir at the bottom of the evaporation section 108 and is discharged. The temperature of the fresh air after dehumidification by the evaporation section 108 drops to 811°C. The dehumidified fresh air enters the heat pipe circulation recovery rear section 109, and is coldly recovered and the temperature is raised to about 15-17°C for the first time by the heat pipe circulation recovery rear section coil 1091.

[0050] The fresh air treated by the heat pipe circulation recovery rear section 109 of the fresh air treatment unit 1 passes through the mixing section 110, the sub-high efficiency filtration section 111, the reheat coil section 112 and the humidification section 113, and is then sent to the precooling purification circulation treatment unit 2 to mix with the indoor return air. At this time, the reheat coil section 112 and the humidification section 113 are not working. The fresh air in the precooling purification circulation treatment unit 2 accounts for 30% and the indoor return air accounts for 70%. The mixed fresh air is temperature-adjusted in the precooling purification circulation treatment unit 2. After being treated by the precooling purification circulation treatment unit 2, the mixed fresh air with a temperature and humidity reaching the preset range is sent to multiple fan filter units 3 through the air duct for pressure filtration and then sent into the room.

[0051] In summary, the present application sets a shunt channel and a main channel in the shunt section of the air inlet unit, so that the fresh air can enter the mixed air section partially or completely through the shunt channel when necessary, reducing the resistance of the fresh air passing through the fresh air handling unit and reducing energy consumption. At the same time, the fresh air passing through the shunt channel can be mixed with the low-temperature and low-humidity fresh air processed by each section of the main channel, adjusting the temperature and humidity of the fresh air in the main channel, and further reducing the operating energy consumption of the fresh air handling unit; in addition, the air volume of the shunt channel and the main channel of the shunt section is adjusted by the automatic control system to minimize the reheat of the entire fresh air handling unit, and the energy consumption is reduced exponentially during the entire processing process, while extending the service life of the equipment. Since the temperature and humidity of outdoor fresh air in different regions and seasons vary greatly, by presetting the required indoor temperature and humidity range, the central controller automatically adjusts the working state of each section according to the outdoor fresh air and indoor temperature and humidity values ​​monitored by the temperature and humidity sensor and the preset range, and maintains the stability of the indoor environment on the basis of energy saving.

[0052] 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. A fresh air handling unit, characterized in that: It includes air intake unit and dehumidification functional section, 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 fan section, a diversion section, a heat pipe circulation recovery front section, a surface cooling section, an evaporation section, a heat pipe circulation recovery rear section, an air mixing section, a reheat coil section and a humidification section in sequence; The heat pipe circulation recovery front section and the heat pipe circulation recovery rear section form a closed loop to recycle and utilize the sensible heat of the fresh air; The dehumidification functional section includes a compressor, a condenser, a low-pressure refrigerant pipe, a medium-pressure refrigerant pipe, and a high-pressure refrigerant pipe connecting the compressor and the inlet end of the condenser; The inlet end of the evaporation section is provided with a decompression device and is connected to the outlet end of the condenser through the refrigerant medium-pressure pipe, and the outlet end of the evaporation section is connected to the compressor through the refrigerant low-pressure pipe; The diversion section includes a main channel and a diversion channel, the main channel of the diversion section is connected to the mixed air section through the heat pipe circulation recovery front section, the surface cooling section, the evaporation section and the heat pipe circulation recovery rear section, and the diversion channel of the diversion section spans the heat pipe circulation recovery front section, the surface cooling section, the evaporation section and the heat pipe circulation recovery rear section and is connected to the mixed air section in a bridging manner.

2. The fresh air handling unit according to claim 1, characterized in that: The condenser is a water-cooled condenser.

3. The fresh air handling unit according to claim 1, characterized in that: The air intake unit further comprises a medium efficiency filter section arranged before the diversion section and after the fan section, and a sub-high efficiency filter section arranged before the reheat coil section and after the air mixing section.

4. The fresh air handling unit according to claim 3, characterized in that: The air intake unit also includes a flow equalizing section arranged before the medium-efficiency filtering section and after the fan section.

5. The fresh air handling unit according to claim 1, characterized in that: A one-way air valve is provided at the outlet end of the diversion channel of the diversion section, and a one-way air valve is provided at the outlet end of the heat pipe circulation recovery rear section.

6. The fresh air handling unit according to claim 1, characterized in that: The fresh air handling unit also includes an automatic control system, which 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, a temperature and humidity sensor arranged indoors, and a switch controller arranged in each section, respectively connected to the central controller. The central controller is used to compare 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 sensor at the fresh air inlet and the temperature and humidity sensor indoors, and automatically adjust the fresh air ratio in the diversion channel and the main channel of the diversion section and the working status of other sections.

7. The fresh air handling unit according to claim 6, characterized in that: The switch controller arranged in each section further includes a diversion channel air volume regulating valve arranged in the diversion channel of the diversion section and a main channel air volume regulating valve arranged in the main channel of the diversion section, a proportional electric valve arranged on the surface cooling section, and control switches respectively arranged on the reheat coil section and the humidification section.

8. The fresh air handling unit according to any one of claims 6-7, characterized in that: The preset temperature range is 19-24℃, and the humidity range is 40%-65%.

9. A combined air handling unit, characterized in that: From the fresh air inlet to the fresh air outlet, it includes in sequence the fresh air processing unit described in any one of claims 6 to 8, a pre-cooling purification circulation processing unit for adjusting the fresh air temperature, and one or more fan filter units for pressurizing and filtering the fresh air.

10. The combined air handling unit according to claim 9, characterized in that: The automatic control system in the fresh air handling unit is connected to the pre-cooling purification cycle handling unit and the fan filter unit, and is used to automatically adjust the working status of relevant sections in the pre-cooling purification cycle handling unit and the one or more fan filter units.

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