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 field of air treatment, in particular to a fresh air handling unit. BACKGROUND

[0002] Medical health is an important part of people's survival process, and higher requirements are put forward for the safety of medical products and drugs at present. Higher standards are also required 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 flow direction, pressure difference, etc. At the same time, the energy consumption under high requirements should also be considered, and high energy consumption is not allowed to exchange for development space.

[0003] At present, a natural and effective method for environmental control is to replace or dilute indoor air with outdoor fresh air in a certain proportion to maintain the oxygen content in the indoor environment within a reasonable range, forming a very comfortable and clean environment, that is, inhaling part of the outdoor fresh air to form indoor positive pressure, while maintaining indoor positive pressure, and discharging part of the indoor gas. The existing fresh air handling unit is composed of multiple functional segments. The fresh air passes through each functional segment in turn to adjust the temperature and humidity, and then enters the indoor environment, 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 to be solved at present. CONTENT OF THE INVENTION

[0004] In order to solve the technical problem of high energy consumption of the existing fresh air handling unit, the present application provides a fresh air handling unit for adjusting the temperature and humidity of fresh air, which comprises an air inlet unit and a dehumidification function segment. The air inlet unit comprises, from the fresh air inlet end to the fresh air outlet end, a fresh air primary filter segment, a fan segment, a flow dividing segment, a heat pipe circulation recovery front segment, a surface cooling segment, an evaporation segment, a heat pipe circulation recovery rear segment, a mixed air segment, a reheating coil segment and a humidification segment. The heat pipe circulation recovery front segment and the heat pipe circulation recovery rear segment form a closed loop to recover and utilize the sensible heat of the fresh air. The dehumidification function segment comprises a compressor, a condenser, a low-pressure refrigerant connection pipe, a medium-pressure refrigerant connection pipe, and a high-pressure refrigerant connection pipe connecting the compressor and the condenser inlet end. The evaporation segment inlet end is provided with a pressure reducing device and is connected with the condenser outlet end through the medium-pressure refrigerant connection pipe. The evaporation segment outlet end is connected with the compressor through the low-pressure refrigerant connection pipe. The flow dividing segment comprises a main channel and a flow dividing channel. The main channel of the flow dividing segment is connected with the mixed air segment through the heat pipe circulation recovery front segment, the surface cooling segment, the evaporation segment and the heat pipe circulation recovery rear segment. The flow dividing channel of the flow dividing segment is connected with the mixed air segment in a bridging manner across the heat pipe circulation recovery front segment, the surface cooling segment, the evaporation segment and the heat pipe circulation recovery rear segment.

[0005] According to the above technical scheme, by adopting the bridge mode to set the shunt passage in the shunt section of the fresh air handling unit, part or all of the fresh air can be made to avoid the section body not participating in fresh air treatment and enter the mixing section through the shunt passage in the transition season or winter, so as to reduce the resistance of the fresh air passing through the fresh air handling unit and reduce the energy consumption. At the same time, the fresh air passing through the shunt passage of the shunt section can be mixed with the low-temperature and low-humidity fresh air treated by the main passage of the shunt section and the sections after the shunt section in the mixing section, so as to adjust the temperature and humidity of the fresh air, and further reduce the operation energy consumption of the fresh air handling unit.

[0006] In some embodiments, the condenser is a water-cooled condenser. The heat generated by the functional section during dehumidification is removed by the form of refrigerated water heat exchange in the water-cooled condenser, which is stable in heat dissipation and dehumidification effect, is not affected by the environment, and reduces the installation space and the installation length of the unit pipeline, making the installation more convenient. In addition, by adjusting the flow of the medium-temperature refrigerated water, the unit can always be kept in the highest energy efficiency working state.

[0007] In some embodiments, the fresh air intake unit further comprises a medium-efficiency filter section arranged before the shunt section and after the fan section, and a sub-high-efficiency filter section arranged before the reheating coil section and after the mixing section.

[0008] In some embodiments, the fresh air intake unit further comprises a flow equalization section arranged before the medium-efficiency filter section and after the fan section. The flow equalization section makes the fresh air pass through the medium-efficiency filter section uniformly, effectively filters the air, improves the air treatment efficiency, and protects the filter.

[0009] In some embodiments, the shunt passage outlet end of the shunt section is provided with a one-way air valve, and the outlet end of the heat pipe circulation recovery rear section is provided with a one-way air valve. 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, preventing the phenomenon of insufficient or no air supply caused by backflow.

[0010] In some embodiments, the fresh air treatment unit further comprises an automatic control system, which comprises a central controller, 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 in the room, and a switch controller arranged at each section, and 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 in the room, and automatically adjust the proportion of fresh air in the shunt channel and the main channel of the shunt section and the working state of each section. According to the above-mentioned embodiments, the indoor temperature and humidity range is preset by the automatic control system, and the proportion of fresh air in the shunt channel and the main channel of the shunt section is dynamically adjusted according to the indoor and outdoor temperature and humidity range, which is more intelligent to reduce the 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 needs to pass through each functional section before entering the room. In addition, the sensible heat of outdoor fresh air can be more reasonably utilized, and the fresh air in the shunt channel and the fresh air in the main channel can be mixed to adjust the temperature and humidity of the fresh air. As long as the temperature and humidity of the fresh air is within the set range, the fresh air can be controlled to enter the mixing section through the shunt channel, and the working state of each section between the shunt section and the mixing section is no longer adjusted, so that the entire unit always works in a cold, hot and constant state, thereby maximizing the energy consumption and prolonging the service life of the equipment.

[0011] In some embodiments, the switch controller arranged at each section further comprises a shunt channel air volume adjusting valve arranged in the shunt channel of the shunt section, a main channel air volume adjusting valve arranged in the main channel of the shunt section, a proportional electrovalve arranged on the surface cooling section, and a control switch arranged on the reheating coil section and the humidifying section, respectively.

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

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

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

[0015] The application will be further described below in conjunction with the drawings and examples. In the drawings:

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

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

[0018] Figure 3 is a structural cross-sectional view of the combined air handling unit.

[0019] Explanation of reference signs:

[0020] 1 fresh air handling unit; 10 fresh air inlet unit; 101 fresh air primary filter section; 102 fan section; 103 flow equalization section; 104 medium efficiency filter section; 105 flow distribution section; 1051 flow distribution passage air volume regulating valve; 1052 main passage 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 dry filter; 1083 electronic pressure reducing valve; 109 heat pipe circulation recovery rear section; 1091 heat pipe circulation recovery rear section coil; 110 mixed air section; 1101 one-way air valve; 111 sub-high efficiency filter section; 112 reheating coil section; 113 humidification section; 20 dehumidification function section; 201 variable frequency compressor; 202 refrigerant low pressure connection pipe; 203 refrigerant high pressure connection pipe; 204 water-cooled condenser; 205 refrigerant medium pressure connection pipe;

[0021] 2 pre-cooling type purification circulation handling unit (PAU); 3 fan filter unit (FFU). DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be described in detail below in combination with the drawings and examples, but the present application is not limited in the scope of the examples.

[0023] The key idea of the present application is to provide a fresh air handling unit, by setting a flow distribution passage in the flow distribution section of the fresh air handling unit, to make part or all of the fresh air in the transition season or winter avoid the section body that does not participate in fresh air handling, reduce the resistance of fresh air passing through the fresh air handling unit and reduce energy consumption, and at the same time, the fresh air passing through the flow distribution passage can be mixed with the low-temperature and low-humidity fresh air treated by the main passage of the flow distribution section and each section body in the mixed air section, for adjusting the temperature and humidity of the fresh air, further reducing the operation energy consumption of the fresh air handling unit.

[0024] As Figure 1 and Figure 2As shown, the fresh air handling unit 1 includes, from the fresh air inlet end to the fresh air outlet end, a fresh air primary filter section 101, a fan section 102, a flow equalization section 103, a fresh air medium filter section 104, a flow distribution 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, a mixed air section 110, a fresh air sub-high efficiency filter section 111, a reheat coil 112, and a humidification section 113. The heat pipe circulation recovery front section 106 and the heat pipe circulation recovery rear section 109 form a closed loop to recover the sensible heat of the fresh air.

[0025] The fresh air primary filter section 101 is used to preliminarily filter the fresh air. The fan section 102 pressurizes the fresh air and accelerates the flow speed of the fresh air. The flow equalization section 103 can make the fresh air evenly pass through the fresh air medium filter section 104, effectively filter the air, improve the air handling efficiency, and protect the filter. The fresh air medium filter section 104 is used to filter the fresh air from small pollution particles.

[0026] The main passage of the flow distribution section 105 is provided with a main passage air volume adjusting valve 1052, and the flow distribution passage is provided with a flow distribution passage air volume adjusting valve 1051. The outlet end of the flow distribution passage of the flow distribution section 105 and the outlet end of the heat pipe circulation recovery rear section 109 are provided with a one-way air valve 1101 to prevent the outflow of the fresh air from being short-circuited to cause the insufficient supply of the fresh air or the failure to supply the fresh air. The central controller adjusts the opening range of the main passage air volume adjusting valve 1052 and the flow distribution passage air volume adjusting valve 1051 to adjust the fresh air volume in the main passage and the flow distribution passage, so that the system is more stable and reliable while the energy consumption is reduced to the greatest extent. When the fresh air does not need to be cooled and dehumidified, the central controller controls the flow distribution passage air volume adjusting valve 1051 to be opened and the main passage air volume adjusting valve 1052 to be closed, so that the fresh air passes through the flow distribution passage to bypass the relevant sections of the fresh air handling unit for cooling and dehumidification, thereby reducing the passage resistance and the energy consumption. By adjusting the main passage air volume adjusting valve 1052 and the flow distribution passage air volume adjusting valve 1051, the functional deficiency of the unit for cooling and dehumidification can also be compensated. For example, when the temperature and humidity of the outdoor fresh air in the transition season are slightly higher than the preset temperature and humidity range, the unit is in a dehumidification state, the frequency of the variable frequency compressor 201 has been adjusted to the minimum, but the fresh air is still dehumidified excessively to cause the humidity to be too low, the flow distribution passage air volume adjusting valve 1051 is appropriately opened to mix the high-temperature and high-humidity fresh air after passing through the flow distribution passage with the fresh air after being cooled and dehumidified through the main passage in the mixed air section 110, so that the temperature and humidity of the fresh air are adjusted, the energy consumption is reduced, the precision requirement of the automatic control system is reduced, the variable frequency compressor 201 is less frequently started and stopped, the risk of equipment accelerated aging is reduced, and the energy consumption is reduced.

[0027] The heat pipe circulation recovery section 106 and the heat pipe circulation recovery section 109 form a closed loop. The heat pipe circulation recovery section 106 includes a heat pipe circulation recovery section coil 1061, and the heat pipe circulation recovery section 109 includes a heat pipe circulation recovery section coil 1091. Both the heat pipe circulation recovery section coil 1061 and the heat pipe circulation recovery section coil 1091 are filled with refrigerant. A refrigerant circulation pump is installed on the pipe connecting the heat pipe circulation recovery section 106 and the heat pipe circulation recovery section 109. This closed loop can transfer the recovered cooling capacity through the refrigerant and the refrigerant circulation pump to the heat pipe circulation recovery section 106 for pre-cooling of high-temperature fresh air, and simultaneously carry the outdoor fresh air heat recovered by the heat pipe circulation recovery section 106 into the heat pipe circulation recovery section 109 for heating the fresh air.

[0028] The cooling coil is installed inside the cooling section 107. The cooling coil is connected to the air conditioning chilled (hot) water system and functions to regulate the fresh air temperature and assist the evaporator section in dehumidification. When the fresh air temperature and humidity are high, and the maximum cooling capacity of the evaporator section 108 is insufficient to lower the fresh air temperature below the dew point, the 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, only the cooling section 107 is activated for cooling without activating the evaporator section 108.

[0029] like Figure 2 As shown, the dehumidification section 20 includes a variable frequency compressor 201, a water-cooled condenser 204, a low-pressure refrigerant connection 202, a medium-pressure refrigerant connection 205, and a high-pressure refrigerant connection 203 connecting the variable frequency compressor 201 and the water-cooled condenser 204. The water-cooled condenser 204 is equipped with a water-cooled condensing coil and a medium-temperature chilled water inlet and outlet. The condensation heat released by the variable frequency compressor 201 during refrigerant compression is removed through heat exchange with the chilled water in the water-cooled condenser 204. This removes the heat generated during dehumidification, ensuring stable heat dissipation unaffected by environmental factors and resulting in more stable dehumidification. It also reduces installation space and piping length, simplifying installation. Adjusting the flow rate of the medium-temperature chilled water allows the unit to operate at its highest energy efficiency.

[0030] The evaporating coil 1081 is installed in the evaporating section 108. The inlet end of the evaporating coil 1081 is provided with a one-way valve, a drying filter 1082 and an electronic pressure reducing valve 1083. The inlet end of the evaporating coil 1081 is communicated with the outlet end of the water-cooled condenser 204 through the refrigerant medium pressure connecting pipe 205. The high pressure refrigerant compressed by the variable frequency compressor 201 flows into the water-cooled condenser 204 to be cooled, and then flows into the evaporating coil 1081 through the refrigerant medium pressure connecting pipe 205. The outlet end of the evaporating coil 1081 is communicated with the variable frequency compressor 201 through the refrigerant low pressure connecting pipe 202. The low pressure refrigerant produced by the evaporating heat absorption flows from the evaporating section 108 to the variable frequency compressor 201 in the functional dehumidifying section 20 through the refrigerant low pressure connecting pipe 202. The inlet end and the outlet end of the evaporating coil 1081 are both arranged at the lower part of the evaporating section 108.

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

[0032] The above-mentioned fresh air treatment unit further comprises an automatic control system. The automatic control system comprises a central controller, a compressor frequency controller connected with the central 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 in the room, and a switch controller arranged at each section body. The central controller is used for comparing the temperature and humidity range preset by the temperature and humidity preset module with the temperature and humidity values read by the temperature and humidity sensor at the fresh air inlet end and the temperature and humidity sensor in the room, and automatically adjusting the fresh air proportion in the shunt passage and the main passage of the shunt section and the working state of each section body.

[0033] The switch controller arranged at each section body further comprises a shunt passage air volume adjusting valve 1051 arranged in the shunt passage of the shunt section, a main passage air volume adjusting valve 1052 arranged in the main passage of the shunt section, a proportional electric valve arranged on the cooling section 107, and control switches arranged on the reheating coil section 112 and the humidifying section 113 respectively. The automatic control system adjusts the fresh air volume entering the shunt passage and the main passage by adjusting the opening range of the shunt passage air volume adjusting valve 1051 and the main passage air volume adjusting valve 1052, and adjusts the working state of each section body in the fresh air treatment unit, so as to reduce the energy consumption of the fresh air treatment unit.

[0034] The fresh air handling unit further comprises an air outlet section, and an air volume adjusting valve is installed in the air outlet section to adjust the air volume entering the pre-cooling purification circulation handling unit 2.

[0035] As shown in Figure 3 the new air after being processed by the fresh air handling unit 1 is distributed by the air volume adjusting valve as needed, and is sent to the pre-cooling purification circulation handling unit (PAU) 2 through the fresh air supply pipeline 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 handling unit 2 only adjusts the temperature of the fresh air, and does not perform dehumidification processing. The mixed fresh air after being processed by the pre-cooling purification circulation handling unit 2 is sent to the fan filter unit (FFU) 3 through the air supply pipeline, is pressurized and filtered, and then is sent to the indoor space to meet the process requirements of cleanliness, pressure gradient, temperature, humidity, air flow pattern and the like. Part of the indoor air is returned to the pre-cooling purification circulation handling unit 2 through the return air inlets in the wall or the ground to complete the whole system circulation, and the other part of the indoor air is discharged to the outdoor space by the exhaust air handling unit (not shown in the figure).

[0036] The automatic control system in the fresh air handling unit 1 is connected with the pre-cooling purification circulation handling unit 2 and the fan filter unit 3, and is used to control the working state of the related sections in the pre-cooling purification circulation handling unit 2 and the fan filter unit 3.

[0037] In the fresh air handling unit 1, the preset temperature range of the temperature and humidity preset module is 19-24℃, and the humidity range is 40%-65%. Since the temperature and humidity of the outdoor fresh air are quite different in different regions and different 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 preset temperature and humidity range, for example, the temperature and humidity of the outdoor fresh air in the transition season are mostly within the preset range, the fresh air is controlled to enter the air mixing section through the shunt channel of the shunt section, and the temperature and humidity are not adjusted. When the temperature and humidity of the outdoor fresh air is not within the preset range, the opening range of the shunt channel air volume adjusting valve 1051 and the main channel air volume adjusting valve 1052 is adjusted on the basis of energy saving, and the temperature and humidity of the indoor air is maintained within the preset range by cooperating with the adjustment of other sections, so that the energy consumption is minimized.

[0038] Example 1: Fresh air handling unit processing outdoor fresh air with low temperature and low humidity in winter

[0039] The temperature and humidity of the outdoor fresh air in winter are lower than the lower limit of the preset temperature range 19-24℃ and the humidity range RH40%-65%. The center controller controls the variable frequency compressor 201 of the dehumidification function section 20 to be closed, and the evaporation section 108 is not working. The center controller controls the circulating pump to gradually reduce the speed, so that the cold carrier in the heat pipe circulation recovery front section coil 1061 and the heat pipe circulation recovery rear section coil 1091 enters the static state.

[0040] The outdoor fresh air is filtered by the fresh air primary filter section 101, and is blown by the fan in the fan section 102 to the flow equalization section 103. The fresh air that is evenly distributed by the flow equalization section 103 is filtered by the medium filter section 104. When the heat of the reheating coil section 112 can make the fresh air reach the preset temperature range, the reheating coil section 112 is started, and the surface cooling section 107 is not started. At this time, the central controller controls the shunt passage air volume adjusting valve 1051 in the shunt passage to be opened, and controls the main passage air volume adjusting valve 1052 in the main passage to be closed. The fresh air enters the air mixing section 110 through the shunt passage. When the outdoor fresh air temperature is low, the heat of the reheating coil section 112 cannot make the fresh air reach the preset temperature range. At this time, the central controller controls the shunt passage air volume adjusting valve 1051 in the shunt passage and the main passage air volume adjusting valve 1052 to be partially opened, so that part of the fresh air is heated by the surface cooling section 107 in the main passage and then reaches the air mixing section 110, and the other part of the fresh air enters the air mixing section 110 through the shunt passage. After the fresh air is mixed in the air mixing section 110, it is further filtered by the sub-high efficiency filter section 111, and then heated by the reheating coil section 112 to finally raise the temperature of the fresh air to 19℃ and keep constant. The humidifying section 113 performs isothermal humidification on the fresh air to ensure that the temperature is 19℃ and the humidification amount is minimum, and the energy consumption is also minimum. After the fresh air is humidified to reach the preset temperature and humidity range by the humidifying section 113, it is sent into the room. The central controller controls the working state of each section body 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: The fresh air handling unit handles outdoor fresh air with a temperature of 27℃ and a 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 in the dehumidification function section 20 to operate 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 connection pipe 203, is cooled and then flows into the evaporating section 108 through the refrigerant medium-pressure connection pipe 205, the one-way valve, the drying filter 1082 and the electronic pressure reducing valve 1083. The low-pressure refrigerant after the evaporating section 108 flows back to the variable frequency compressor 201 through the refrigerant low-pressure connection pipe 202. At this time, the cooling carrier circulating pump gradually increases the speed, so that the cooling carrier in the heat pipe circulating recovery front coil 1061 and the heat pipe circulating recovery rear coil 1091 enters the flow state.

[0043] The outdoor fresh air is filtered by the fresh air initial filter section 101, and is blown by the fan of the fan section 102 to the flow equalization section 103. The fresh air that is equalized by the flow equalization section 103 is filtered by the medium filter section 104. Because the temperature and humidity of the outdoor fresh air is close to the preset range, the compressor is kept at the lowest frequency and does not stop (the stop protection time of the compressor is more than 3-5 minutes, which will affect the humidity adjustment, and the frequent start and stop of the compressor will increase the energy consumption and shorten the service life of the equipment). The humidity of the fresh air that enters the evaporating section 108 for dehumidification through the main channel is still lower than the lower limit of the preset range. At this time, the center controller controls the opening of the flow adjustment valve 1051 of the shunt channel and the flow adjustment valve 1052 of the main channel, so that part of the fresh air passes through the shunt channel to the air mixing section 110, and the other part of the fresh air passes through the main channel, and the heat pipe circulation recovery front section 106 recovers heat, the evaporating section 108 dehumidifies and cools, and the heat pipe circulation recovery rear section 109 recovers cold to enter the air mixing section 110 (at this time, the cooling section does not work). The high-temperature and high-humidity fresh air passing through the shunt channel and the low-temperature and low-humidity fresh air passing through the main channel are mixed in the air mixing section 110. The temperature and humidity of the mixed fresh air can reach the preset range. The filtered fresh air passing through the sub-high-efficiency filter section 111 is sent into the indoor through the reheating coil section and the humidifying section. At this time, the reheating coil section and the humidifying section do not work. The energy saving rate of the fresh air handling unit is as high as 50%.

[0044] Example 3: Fresh air handling unit processing outdoor high-temperature and high-humidity fresh air in summer

[0045] The preset indoor temperature range is 19-24℃, and the humidity is RH40%-65%. The center controller compares the temperature and humidity monitored by the temperature and humidity sensor at the inlet of the fresh air 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 connection pipe 203, and is cooled. After cooling, the refrigerant flows into the evaporating section 108 through the refrigerant medium-pressure connection pipe 205, the one-way valve, the drying filter 1082 and the electronic pressure reducing valve 1083. The low-pressure refrigerant after the evaporating section 108 flows back to the variable frequency compressor 201 through the refrigerant low-pressure connection pipe 202. At this time, the circulating pump gradually increases the speed of the circulating pump, so that the coolant in the heat pipe circulation recovery front section coil 1061 and the heat pipe circulation recovery rear section coil 1091 enters the flow state.

[0046] The outdoor high temperature and high humidity fresh air is filtered by the primary efficiency filter section 101, and then is blown by the fan section 102 to the flow equalization section 103. The fresh air is filtered by the medium efficiency filter section 104. The center controller controls the shunt passage air volume regulating valve 1051 to be closed and the main passage air volume regulating valve 1052 to be opened. At this time, the outdoor fresh air is filtered by the main passage, and the heat pipe circulation recovery front section 106 recovers heat, the cooling section 107 cools, the evaporation section 108 cools and dehumidifies, and the heat pipe circulation recovery rear section 109 recovers cold. The dehumidified fresh air is filtered by the sub-high efficiency filter section 111, heated by the reheating coil section 112, and then sent into the indoor environment. At this time, the center controller controls the humidification section 113 to be closed, and the fresh air does not need to be humidified. The energy saving rate of the air handling unit is as high as 50%.

[0047] Example 4: The combined air handling unit processes outdoor fresh air with a temperature of 36°C and high humidity

[0048] The preset indoor temperature range is 19-24°C, and the humidity is RH40%-65%. The center 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 water-cooled condenser 204 through the refrigerant high-pressure connection pipe 203, and the medium-pressure liquid refrigerant formed by heat dissipation flows into the evaporation section 108 through the refrigerant medium-pressure connection pipe 205, the one-way valve, the dry filter 1082, and the electronic pressure reducing valve 1083. The low-pressure refrigerant after the evaporation section 108 flows back to the variable frequency compressor 201 through the refrigerant low-pressure connection pipe 202. At this time, the circulation pump gradually increases the speed of the heat pipe circulation recovery front section coil 1061 and the heat pipe circulation recovery rear section coil 1091, so that the heat pipe circulation recovery front section coil 1061 and the heat pipe circulation recovery rear section coil 1091 enter the flow state.

[0049] The outdoor fresh air is filtered by the primary efficiency filter section 101, and then is blown by the fan section 102 to the flow equalization section 103. The fresh air is filtered by the medium efficiency filter section 104. The fresh air filtered by the medium efficiency filter section 104 is cooled and dehumidified by the heat pipe circulation recovery front section 106, and the temperature is reduced by about 6-9°C. The medium temperature and high humidity fresh air after cooling enters the cooling section 107, and then is further cooled by the evaporation section 108. The water in the fresh air is cooled to the dew point of dehumidification, and the water is condensed and separated on the outer wall of the evaporation coil 1081. The condensed water flows to the water storage tank at the bottom of the evaporation section 108 and is discharged. The temperature of the dehumidified fresh air is reduced to 81 1°C. The dehumidified fresh air enters the heat pipe circulation recovery rear section 109, and the heat pipe circulation recovery rear section coil 1091 cools and recovers the cold, and the temperature of the fresh air is increased to about 15-17°C.

[0050] The fresh air after being treated by the fresh air treatment unit 1 is circulated and recovered by the heat pipe, and then passes through the air mixing section 110, the sub-high efficiency filter section 111, the reheating coil section 112 and the humidifying section 113, and is sent to the pre-cooling purification circulation treatment unit 2 to be mixed with the indoor return air. At this time, the reheating coil section 112 and the humidifying section 113 do not work. The fresh air accounts for 30% and the indoor return air accounts for 70% in the pre-cooling purification circulation treatment unit 2. The mixed fresh air is temperature-regulated in the pre-cooling purification circulation treatment unit 2. The mixed fresh air with temperature and humidity reaching the preset range is sent to the multiple fan filter units 3 through the air pipe, is pressurized and filtered, and is then sent to the indoor.

[0051] In summary, the application sets the shunt channel and the main channel in the air inlet unit, so that the fresh air can partially or completely pass through the shunt channel to enter the air mixing section when needed, reduces the resistance of the fresh air passing through the fresh air treatment unit and the energy consumption, and the fresh air passing through the shunt channel can be mixed with the low-temperature and low-humidity fresh air treated by the main channel, so as to adjust the temperature and humidity of the fresh air in the main channel and further reduce the energy consumption of the fresh air treatment 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, so that the reheating amount of the entire fresh air treatment unit is minimized, the energy consumption is reduced by several times during the entire treatment process, and the service life of the equipment is prolonged. Since the temperature and humidity of the outdoor fresh air in different regions and different seasons have great differences, the required temperature and humidity range in the room is preset, the central controller compares the outdoor fresh air and indoor temperature and humidity values monitored by the temperature and humidity sensor with the preset range, and automatically adjusts the working state of each section, so as to maintain the stability of the indoor environment on the basis of saving energy.

[0052] The above description is only an embodiment of the application, which is used to help understand the application and does not limit the protection scope of the application. It should be pointed out that some improvements made by those skilled in the art without departing from the principles of the application should also be regarded as the protection scope of the application.

Claims

1. A fresh air handling unit, characterized in that, Includes an air intake unit and a dehumidification section, wherein: The air intake unit, from the fresh air inlet end to the fresh air outlet end, includes, in sequence, a fresh air primary filter section, a fan section, a distribution section, a heat pipe circulation recovery front section, a surface cooling section, an evaporation section, a heat pipe circulation recovery rear section, a mixing section, a reheat coil section, and a humidification section. The heat pipe circulation recovery front section and the heat pipe circulation recovery rear section form a closed loop to recover and utilize the sensible heat of the fresh air. The dehumidification section includes a compressor, a condenser, a low-pressure refrigerant connection, a medium-pressure refrigerant connection, and a high-pressure refrigerant connection connecting the compressor and the inlet of the condenser. The inlet end of the evaporation section is equipped with a pressure reducing device and is connected to the outlet end of the condenser via the refrigerant medium-pressure pipe. The outlet end of the evaporation section 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 mixing section via the heat pipe circulation recovery front section, the surface cooling section, the evaporation section and the heat pipe circulation recovery rear section. The diversion channel of the diversion section is connected to the mixing section in a bridging manner across the heat pipe circulation recovery front section, the surface cooling section, the evaporation section and the heat pipe circulation recovery rear section.

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 also includes a medium-efficiency filter section disposed before the flow splitting section and after the fan section, and a sub-high-efficiency filter section disposed before the reheat coil section and after the mixing section.

4. The fresh air handling unit according to claim 3, characterized in that, The air intake unit also includes a flow equalization section disposed before the medium-efficiency filter 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 also provided at the outlet end of the heat pipe circulation recovery 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 installed at the fresh air inlet, a temperature and humidity sensor installed indoors, and a switch controller installed in each section. 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 indoors, and automatically adjust the fresh air ratio in the diversion channel and 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 controllers installed in each section further include a flow channel air volume regulating valve installed in the flow channel of the flow branch section and a main channel air volume regulating valve installed in the main channel of the flow branch section, a proportional electric valve installed on the surface cooling section, and control switches installed on the reheat coil section and the humidification section respectively.

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, The system comprises, sequentially from the fresh air inlet to the fresh air outlet, a fresh air handling unit as described in any one of claims 6-8, a pre-cooling purification and circulation handling unit for regulating 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 circulation handling unit and the fan filter unit, and is used to automatically adjust the working status of relevant sections in the pre-cooling purification circulation handling unit and the one or more fan filter units.

Images