A combined coil air treatment device, and an air treatment system and use method based thereon

Abstract

The present invention discloses a combined coil air treatment device, and an air treatment system and use method based thereon. The device divides a traditional air treatment device into two compartments, one compartment for processing return air, and the other compartment for processing fresh air. With the device of the present invention, fresh air and return air enter the shell through the air inlet, enter the first compartment and the second compartment respectively through the combined coil, and are respectively delivered through different vertical air outlets. The above process divides the air treatment process of fresh air and return air, and increases the coil area occupied by the fresh air treatment unit by removing or moving the vertical insulation baffle. At the same time, due to the adjustability of the return air section fins and the fresh air section fins, the flexibility of the combined coil to adapt to changes in load is greatly improved, because the vertical baffle of the device and the exhaust duct are used for two purposes, and can play the role of the fresh air duct.

Description

[Technical field]

[0001] The present invention belongs to the technical field of fresh air systems, and relates to a combined coil air treatment device, and an air treatment system and a use method thereof. [Background technology]

[0002] As a heat exchange device commonly used in air conditioning systems, coils can use one medium to cool or heat another medium, ultimately achieving the effect of heat and moisture exchange. Coils have the advantage of individual control, and their small size makes them easy to arrange, install, and maintain. Coils can be used in conjunction with other accessories in air conditioning systems to meet some of the needs of indoor ventilation.

[0003] When a large air volume is needed indoors to increase the degree of indoor replacement, the current traditional air conditioning system can increase the fresh air volume or operate in full fresh air conditions to a certain extent, but it will not be able to completely offset the indoor load when using the full fresh air volume. On the one hand, long-term full fresh air operation will cause a large load on the traditional air conditioning system and damage the mechanical equipment in the air conditioning system; on the other hand, the lack of cold / heat carried by the air supply will seriously affect the thermal comfort of indoor occupants. [Summary of the invention]

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a combined coil air treatment device, and an air treatment system and a method of use based thereon, so as to solve the technical problems in the prior art center that the fresh air system has insufficient air supply, resulting in insufficient indoor gas replacement, and long-term use leads to a heavy load on the air-conditioning system.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A combined coil air treatment device comprises a shell, wherein a detachable vertical baffle is arranged inside the shell, and the vertical baffle is perpendicular to the front wall of the shell; one side of the vertical baffle is a first compartment, and the other side is a second compartment;

[0007] A fresh air inlet is arranged on the front wall of the first compartment, and a return air inlet is arranged on the front wall of the second compartment; a fresh air outlet is arranged on the rear wall of the first compartment, and a return air outlet is arranged on the rear wall of the second compartment; a plurality of fresh air segment ribs are detachably arranged in the first compartment, and a plurality of return air segment ribs are detachably arranged in the second compartment; a coil is arranged in the shell, and the coil passes through the fresh air segment ribs, the vertical baffles and the return air segment ribs.

[0008] The present invention is further improved in that:

[0009] Preferably, the fresh air inlet is at the center of the front wall of the first compartment, and the return air inlet is at the center of the front wall of the second compartment.

[0010] Preferably, the thickness of the fresh air section ribs and the return air section ribs are both 0.2-0.4 mm.

[0011] Preferably, the fresh air section ribs are arranged at equal intervals, and the distance between adjacent fresh air section ribs is 2.4-3.2 mm; the return air section ribs are arranged at equal intervals, and the distance between adjacent return air section ribs is 2.4-3.2 mm.

[0012] Preferably, the fresh air section ribs are wavy along their length direction, and the return air section ribs are serrated along their length direction.

[0013] Preferably, the vertical baffles, the fresh air section ribs and the return air section ribs are all provided with holes, and the holes are used to pass the coil.

[0014] An air treatment system based on the above-mentioned combined coil air treatment device, wherein the fresh air inlet is connected to a fresh air inlet pipe, and the fresh air outlet is connected to a fresh air outlet pipe; the return air inlet is connected to a return air inlet pipe, and the return air outlet is connected to a return air outlet pipe; a reverse fan is arranged on the return air inlet pipe, the return air inlet pipe is connected to a return air main pipe, and a third valve is arranged at the connection between the return air inlet pipe and the return air main pipe, and the third valve is a three-way valve.

[0015] Preferably, a second valve is provided on the return air inlet pipe, the fresh air inlet pipe is connected to the return air inlet pipe through a connecting pipe, and the connection between the connecting pipe and the return air inlet pipe is before the second valve; a fifth valve is provided on the connecting pipe.

[0016] Preferably, a second fan is provided on the fresh air outlet pipe, a first fan is provided on the return air outlet pipe, and a return air fan is provided on the return air main pipe.

[0017] A method for using the above-mentioned air treatment system based on the combined coil air treatment device,

[0018] When the fresh air inlet pipe and the return air inlet pipe of the system both take in air, the fresh air enters the first compartment through the fresh air inlet pipe, is cooled, and is then discharged through the fresh air outlet pipe; the return air enters the second compartment through the return air main pipe and the return air inlet pipe, is cooled, and is then discharged through the return air outlet pipe;

[0019] When the indoor fresh air volume needs to be increased, the fresh air enters the first compartment through the fresh air inlet pipe, is cooled, and then is discharged through the fresh air outlet pipe; the third valve connects the discharge end of the return air main pipe and the return air inlet pipe, and the reverse fan works to drive the fresh air from the discharge end of the return air main pipe into the return air inlet pipe, and then is cooled in the second compartment and discharged through the return air outlet pipe. Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention discloses a combined coil air treatment device, which divides a traditional air treatment device into two compartments, one compartment for processing return air, and the other compartment for processing fresh air. With the device of the present invention, fresh air and return air enter the shell through the air inlet, enter the first compartment and the second compartment respectively through the combined coil, and are respectively sent out through different vertical air outlets. The above process divides the air treatment process of fresh air and return air, and increases the coil area occupied by the fresh air treatment unit by removing or moving the vertical insulation baffle. At the same time, due to the adjustability of the return air section fins and the fresh air section fins, the flexibility of the combined coil to adapt to changes in load is greatly improved, because the vertical baffle of the device The exhaust duct is used for two purposes and can play the role of a fresh air duct. The present invention saves the capital investment in additional transformation or reconstruction of the air conditioning system, and at the same time reduces the occupied space of the AHU.

[0021] Furthermore, the fresh air inlet and the return air inlet are located in the center of the two compartments to ensure the cooling effect.

[0022] Furthermore, the thickness of the two fins is increased to ensure the cooling effect.

[0023] Furthermore, the spacing between the fresh air section fins and the return air section fins can be adjusted according to the cooling air volume demand.

[0024] Furthermore, the shapes of the return air section fins and the fresh air section fins of the two compartments are designed differently, thereby ensuring an improvement in the heat transfer efficiency of both.

[0025] The present invention also discloses an air treatment system of a combined coil air treatment device, in which valves and rotary fans are arranged in the whole air supply system, so that the compartment for processing return air can be adjusted according to demand, and the whole system can introduce fresh air from the original exhaust duct to increase the amount of fresh air entering the room. The system is a double air duct system composed of fresh air duct and return air duct, and the two air ducts are mixed in the mixing box in front of the air outlet of each room with different functions according to the design requirements, so that the air supply volume and air supply state meet the required heat load and humidity load of the room.

[0026] The present invention also discloses a method for using an air treatment system based on the combined coil air treatment device, which can adjust the pipeline according to the demand for fresh air volume in the room to meet the demand for different fresh air volumes.

Brief Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Among them, (a) is a stereoscopic view of the present invention; (b) is a front view of the present invention; (c) is a schematic diagram of the shell structure;

[0029] Figure 2 It is a schematic diagram of the principle of the present invention;

[0030] Figure 3 It is a vertical baffle at the center of the shell;

[0031] Figure 4 It is a schematic diagram of the rib plate form corresponding to the fresh air section and the return air section;

[0032] Among them: (a) is the fresh air section; (b) is the return air section;

[0033] Figure 5 This is a schematic diagram of the combined coil when the air conditioning system is running with fresh air;

[0034] Figure 6 This is a schematic diagram of the combined coil when the air conditioning system increases the fresh air ratio;

[0035] Figure 7 It is a structural schematic diagram of the first unit structure.

[0036] Wherein: 1—shell, 1-1—top surface, 1-2—first side wall, 1-3—front wall, 1-4—bottom surface, 1-5—second side wall, 1-6—rear wall; 2—return air section fins, 3—second compartment, 4—vertical baffle, 5—first compartment, 6—coil, 7—fresh air section fins, 8—chilled water outlet, 9—chilled water inlet; 10—fresh air inlet; 11—return air inlet; 12—first unit structure; 12-1—first plane; 12-2—second plane; 12-3—third plane; 12-4—fourth plane; 13-first valve; 14-coil air handling device; 15-first fan; 16-fresh air outlet duct; 17-return air outlet duct; 18-second fan; 19-second valve; 20-return air inlet duct; 21-reverse fan; 22-third valve; 23-fourth valve; 24-return air fan; 25-fresh air inlet duct; 26-fifth valve; 27-connecting pipe; 28-return air main duct. [Specific implementation method]

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0038] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] See also Figure 1 The present invention discloses a combined coil air treatment device, and an air treatment system and a method of use thereof, the structure comprising a shell 1, the shell 1 is a cubic structure, the shell 1 comprises a top surface 1-1, a first side wall 1-2, a front wall 1-3, a bottom surface 1-4, a second side wall 1-5, and a rear wall 1-6, wherein the sides of the first side wall 1-2, the front wall 1-3, the second side wall 1-5 and the rear wall 1-6 are sequentially connected to form the side walls of the entire shell 1, the upper ends of the four side walls are connected to the top surface 1-1, and the four side walls are connected to the bottom surface 1-4. The bottom of the wall is connected to the bottom surface 1-4; a vertical baffle 4 is arranged inside the shell 1, and the vertical baffle 4 is parallel to the first side wall 1-2 and the second side wall 1-5, and the vertical baffle 4 divides the internal space of the shell 1 into two compartments, namely the first compartment 5 and the second compartment 3; therefore, the front wall 1-3, the top surface 1-1, the vertical baffle 4, the bottom surface 1-4 and the first side wall 1-2 constitute the second compartment 3, and the front wall 1-3, the top surface 1-1, the vertical baffle 4, the bottom surface 1-4 and the second wall surface 1-5 constitute the second compartment 3.

[0040] A number of fresh air section ribs 7 are arranged in the first compartment 5, and a number of return air section ribs 2 are arranged in the second compartment 3. The fresh air section ribs 7 and the return air section ribs 2 are both perpendicular to the front wall 1-3, and all the return air section ribs 2 are arranged at equal intervals, and all the fresh air section ribs 7 are arranged at equal intervals; a fresh air inlet 10 is arranged on the front wall 1-3 of the first compartment 5, and a return air inlet 11 is arranged on the front wall 1-3 of the second compartment 3. Both the fresh air inlet 10 and the return air inlet 11 are rectangular inlets. Preferably, the fresh air inlet 10 is at the center of the front wall 1-3 of the first compartment 5, and the return air inlet 11 is at the center of the front wall 1-3 of the second compartment 3. A fresh air outlet is arranged on the rear wall 1-6 of the first compartment 5, and a return air outlet is arranged on the rear wall 1-6 of the second compartment 3. Both the fresh air outlet and the return air outlet are rectangular outlets. Preferably, the fresh air outlet is at the center of the rear wall 1-6 of the first compartment 5, and the return air outlet is at the center of the rear wall 1-6 of the second compartment 3.

[0041] The vertical baffle 4, the fresh air section fin 7 and the return air section fin 2 can be removed or moved left and right in the housing 1 to adjust the spacing between the three. The spacing adjustment is changed according to the requirements of the fresh air ratio, air supply volume, etc.

[0042] See also Figure 4 and Figure 7 The return air section ribs 2 are serrated ribs. Specifically, each return air section rib 2 is composed of a plurality of first unit structures 12 along its length direction. The first unit structure 12 includes two first planes 12-1 and a third plane 12-3 which are parallel in the vertical direction and not in the same plane. The first plane 12-1 and the third plane 12-3 are connected by a second plane 12-2. The second plane 12-2 is perpendicular to the first plane 12-1. The other end of the third plane 12-3 is connected to a fourth plane 12-4. The fourth plane 12-4 is parallel to the second plane 12-2. The fourth plane 12-4 is connected to the first plane 12-1 of the next first unit structure 12.

[0043] See also Figure 4 The fresh air section fins 7 are wavy along their length direction.

[0044] Preferably, the vertical baffle 4 , the fresh air section fins 7 and the return air section fins 2 have the same width and height to ensure that they can be installed in the housing 1 .

[0045] See also Figure 3 , the coil 6 is filled with chilled water, the chilled water outlet 8 and the chilled water inlet 9 are both arranged on the second side wall 1-5 of the housing 1, and the coil 6 of the combined coil air handling device is provided with holes on the fresh air section fin 7, the return air section fin 2 and the vertical baffle 4. In order to clearly show the structure of the fresh air section fin 7 and the return air section fin 2, the holes on these two fins are Figure 4It is not represented in the figure, and is used to pass through the coil 6. From top to bottom, the coil 6 is in an "S" shape inside the shell 1, and it passes through each fresh air section rib 7, return air section rib 2 and vertical baffle 4 in the shell 1 in a circuitous manner, so that the fresh air and return air can continuously exchange heat with the chilled water in the coil 6 during the process of entering from the inlet and exiting from the outlet, and at the same time exchange heat with the fins.

[0046] See also Figure 2 , is an air treatment system based on the above-mentioned combined coil air treatment device, including a coil air treatment device 14, the fresh air inlet 10 of the air treatment device 14 is connected to a fresh air inlet pipe 25, the fresh air inlet pipe 25 is provided with a first valve 13, the fresh air outlet is connected to a fresh air outlet pipe 16, the fresh air outlet pipe 16 is provided with a first fan 15, used to extract fresh air from the first compartment 5; the return air inlet 11 of the air treatment device 14 is connected to a return air inlet pipe 20, the return air inlet pipe 20 is provided with a second valve 19, the return air outlet is connected to a return air outlet pipe 17, the return air outlet pipe 17 is provided with a second fan 18, used to extract return air from the second compartment 3, the return air inlet pipe 20 and the return air main pipe 28, the return air main pipe 28 is provided with a fourth valve 23 and a return air fan 24, the return air fan 24 is used to draw return air into the coil air treatment device. A third valve 22 is provided at the connection between the return air inlet pipe 20 and the return air main pipe 28. The third valve 22 is a three-way valve. The return air inlet pipe 20 is also connected to the fresh air inlet pipe 25 through a connecting pipe 27 before the second valve 19. The connecting pipe 27 is provided with a fifth valve 26.

[0047] How to use the above system:

[0048] When the system has fresh air and return air, the first valve 13 is opened, the fifth valve 26 is closed, the second valve 19 is opened, and the third valve 22 connects the return air main pipe 28 and the return air inlet pipe 20, the fourth valve 23 is opened, and the fifth valve 26 is disconnected. The fresh air enters the first compartment 5 through the fresh air inlet pipe 25 for cooling, and is then discharged through the fresh air outlet pipe 16 under the action of the first fan 15; the return air passes through the return air main pipe 28, enters the return air inlet pipe 20 under the action of the return air fan 24, enters the second compartment 3 through the return air inlet pipe 20, and is then discharged through the return air outlet pipe 17 under the action of the second fan 18.

[0049] When the indoor cooling capacity of fresh air needs to be increased, the third valve 22 and the fourth valve 23 are cut off, and the fifth valve 26 is opened. The fresh air enters the first compartment 5 through the fresh air inlet pipe and enters the second compartment 3 through the connecting pipe 27. The fresh air in the two compartments is discharged under the action of the first fan 15 and the second fan 18, thereby increasing the cooling capacity of the fresh air.

[0050] When the indoor fresh air volume needs to be increased, the fourth valve 23 and the fifth valve 26 are cut off, and the fresh air inlet pipe 25 allows fresh air to flow normally. The fresh air enters the first compartment 5 through the fresh air inlet pipe 25 and is cooled. Then, it is discharged through the fresh air outlet pipe 16 under the action of the first fan 15. At the same time, the reverse fan 21 is running, and the third valve 22 is connected to the exhaust port of the return air main 28 and the return air inlet pipe, so that fresh air is introduced from the exhaust port of the return air main 28. The introduced fresh air enters the second compartment 3 through the return air inlet pipe 20 and is discharged through the return air outlet pipe 17 under the action of the second fan 18.

[0051] The above three usage methods make the system applicable to places with different requirements for fresh air volume.

[0052] Working principle of the present invention:

[0053] The return air and fresh air enter the interior from the front wall 1-3 of the housing 1, respectively, and enter the first compartment 5 and the second compartment 3 through the vertical partition 4, respectively, and are respectively sent out from the air outlets located on the rear wall 1-6 of the housing 1. The above process combines the cooling process of the return air and the fresh air, so that the space occupied by the AHU in the whole system is reduced, and the space utilization rate is greatly improved. At the same time, due to the adjustability and detachability of the vertical baffle 4, the fresh air section fin 7 and the return air section fin 2, the requirements of delivering fresh air indoors or increasing the fresh air ratio can be met, such as Figure 5 and Figure 6 As shown. In addition, the present invention adopts a double duct system, and the fresh air inlet pipe 25 and the return air inlet pipe 20 are mixed in the coil air handling device 14 in front of the room, so that the air supply volume and air supply state can meet the needs of rooms with different functions. The air ducts of this double duct system are centrally arranged, and the flow speed in the pipe is appropriately increased to reduce the pipe diameter. The present invention can also be applied to a single duct system, where a mixing section is installed at the end of the air conditioning processing unit, and after uniform mixing, it is sent out to the room terminal device through a section of air supply pipe.

[0054] Fresh air and return air enter the shell 1 from the air inlet, and the untreated air moves forward along the fins and coil 6, respectively exchanging heat and moisture with the fresh air section fins 7 and the return air section fins 2 and the coil 6, transferring heat to the chilled water flowing inside the coil 6. The fresh air section fins 7 and the return air section fins 2 play a role in slowing down the speed of the entire hot air. At this time, the temperature of the fresh air and return air is reduced. As the air continues to enter the shell 1 from the fresh air inlet pipe 25 and the return air inlet pipe 20, the air temperature in the two compartments is further reduced. The air flow after cooling is sent out from the two air outlets, and is sent to the mixing box of the terminal device in front of the room by the fresh air outlet pipe 16 and the return air outlet pipe 17 for full mixing in a certain proportion.

[0055] When the demand for fresh air volume increases, it is necessary to optimize the exhaust duct of the system. That is, when the exhaust duct is small, a large diameter pipe with the same diameter as the return duct section is selected during the design stage; when the exhaust duct section is large, a large diameter return duct is selected to match the internal small diameter exhaust. Through the existing pipeline settings, the exhaust duct and the fresh air duct fan section are used to suck air into the room at the same time, and the fresh air duct and the return air duct simultaneously transport fresh air, which is sent to the end room after being processed by the combined coil.

[0056] In order to meet the requirements of the wind speed of the cooling section of the air conditioning unit, a water baffle can be installed at the back, so that no water droplets will be blown out even at high wind speeds. The specific modulus is determined by the actual project. Therefore, the air volume of the shell 1 needs to meet certain requirements to avoid noise interference generated at high wind speeds.

[0057] Different fin shapes play an important role in the heat transfer of coil systems. Increasing the thickness of the fins can enhance the heat transfer performance of the surface heat transfer and improve the heat transfer efficiency. However, too thick fins will also reduce the surface area of ​​the fin tube per unit length, so 0.2-0.4mm can be taken. Similarly, the fin spacing will also affect the heat transfer performance, but the increase in the contact area between the unit fin tube and the air will also improve its performance relatively. The fin spacing can be 2.4-3.2mm. The fin height does not have a great effect on heat transfer and should not exceed 18mm.

[0058] The design principle of the combined coil of the present invention is as follows:

[0059] The specific size of the coil of the present invention is selected based on the heat and mass exchange principle theory.

[0060] When the air is cooled by a surface cooler, the medium in the pipe does not directly contact the outside air. The air exchanges heat and mass with the pipe surface, and the best flow mode for the water-cooled coil air handling device 14 commonly used in air conditioning systems is cross-counterflow.

[0061] The basic formulas of the partition-type heat and mass exchange equipment are the heat transfer equation and the heat balance equation:

[0062] Q=KAΔt m (0-1)

[0063] Among them, Δt m is the average temperature difference of the coil air handling device 14, K is the heat transfer coefficient of the coil air handling device 14, and A is the heat transfer area of ​​the coil air handling device 14. Several assumptions are made to simplify the calculation. It is assumed that the entire coil air handling device 14 has uniform heat transfer as a whole, and the chilled water inlet water temperature of the first compartment and the second compartment is consistent.

[0064] First, through heat load and air volume calculation, the air volume of fresh air and return air to be processed, outdoor state parameters and indoor state parameters are known, and the specific performance parameters of the coil air handling device 14 and the inlet and outlet water temperature and water volume of the chilled water are tried to be calculated.

[0065] Calculate the contact coefficient ε2 of the air treatment process required to determine the number of water pipe rows of the coil-type air treatment device 14.

[0066]

[0067] Select the coil air handling device 14 that meets the required number of rows according to the contact coefficient, where t1 represents the dry bulb temperature of the air in the initial state, t2 represents the dry bulb temperature of the air in the final state, and t s Represents the dew point temperature of the air at that point.

[0068] The performance parameters of the primary coil air handling unit 14 are:

[0069] Assuming the headwind speed V y , the general wind speed range is 1.5-3m / s. Calculate the windward area A based on the assumed wind speed y , and then calculate the actual wind speed. If the calculated values ​​are not much different, you can continue the calculation. Otherwise, you must reselect the model.

[0070]

[0071] Where G is the air volume that the coil air handling device 14 needs to handle, and ρ is the density of air. After selecting the parameters such as the fin spacing, fin form, and fin thickness of the coil air handling device 14, calculate the heat transfer area A of each row of the selected coil air handling device 14. d and water flow cross-sectional area A w .

[0072] ① Solution of moisture analysis coefficient

[0073] The size of the moisture separation coefficient directly reflects how much water is condensed on the equipment. Under dry conditions, ξ=1 and its calculation formula is:

[0074]

[0075] where c p is the specific heat capacity of air, i1 and i2 are the enthalpy values ​​of air in the initial and final states.

[0076] ② Calculation of heat transfer coefficient

[0077] The economic flow rate in the coil air handling device 14 is generally controlled at 0.6-1.8 m / s. The heat transfer coefficient is calculated by the formula after assuming the water pipe flow rate within this range.

[0078]

[0079] Among them, A, B, m, n, and p are exponents and coefficients obtained from the experiment, and all are dimensionless numbers.

[0080] ③ Calculate the amount of cold water

[0081] W=A w ω10 3 (0-6)

[0082] ④ Calculate the heat exchange efficiency of the coil air handling unit 14

[0083]

[0084]

[0085] After the calculation is completed, ε1 can be obtained by looking up the table.

[0086] ⑤ Find the water temperature

[0087]

[0088]

[0089] After all calculations are completed, the selected coil air handling device 14 can be checked and calculated.

[0090] Example 1

[0091] Take the operating condition where the air conditioning system does not need to increase the air volume as an example:

[0092] It is known that the fresh air volume to be processed is 1.7kg / s, the initial air parameters are t1=33.5℃, i1=82.63kJ / kg. 干空气 ,t s1 =24.1℃. And we can know that the final parameters of air are t2=25℃, i2=71.28kJ / kg. 干空气 ,t s2 =23.2℃.

[0093] According to formula (1-2), ε2 = 0.809, the UII type 2-row coil air handling device 14 can meet the requirements. Assume that V y is 1.5m / s. According to formula (1-3), we can get: Actual A y =0.944

[0094] So we can get the actual V by back calculation. y =1.5m / s. According to the relevant manual, the actual 4-row UII coil air handling device 14 has ε2 = 0.841, which is not much different from the required requirements. At the same time, it can be known that the heat transfer area A of each row of the coil air handling device 14d =12.15m 2 , the water flow area is A w =0.00407m 2 According to formula (1-4), the moisture separation coefficient ξ=1.32. The heat transfer coefficient is determined by the assumed flow rate method, and 1.2m / s is preselected within the economic flow rate range. Substituting the above calculation results into the formula, we can get

[0095] According to formula (1-6), W = 0.00102 × 1.2 × 10 3 =1.22kg / s. According to formulas (1-7) and (1-8), we can get NTU = 0.53, C r =0.11, check the corresponding ε-NTU and C r The corresponding curve yields ε2 = 0.35. From formulas (1-9) and (1-10), we can see that the initial temperature of the chilled water is 9.2°C and the final temperature of the chilled water is 12.3°C.

[0096] The above is the selection calculation for the fresh air condition, and the selection operation process of the return air section coil air treatment device 14 is the same as above.

[0097] Example 2

[0098] Calculate the selection of coil-type air handling device 14 for fresh air conditions.

[0099] The fresh air return air ratio is preset to 1:9, and the exhaust air volume is 10%. The total air volume under the fresh air operation condition is 5.55kg / s, of which the exhaust air volume is 0.56kg / s. Consistent with the above-mentioned implementation case 1, the JW type coil air treatment device 14 is pre-selected. The initial air parameters are t1=33.5℃, i1=82.63kJ / kg. 干空气 ,t s1 =24.1℃. And we can know that the final parameters of air are t2=13.4℃, i2=41.14kJ / kg. 干空气 ,t s2 =14.25℃.

[0100] According to formula (1-2), ε2 = 0.823, the initial selection of JW type 8-row coil air handling device 14 can meet the requirements. Assume that V y is 2m / s. According to formula (1-3), we can get: Actual A y =2.57, so the actual V y =1.8m / s. According to the relevant manual, the actual 6-row JW coil air handling device 14 has ε2=0.911, which is not much different from the required requirements. At the same time, it can be known that the heat transfer area A of each row of the coil air handling device 14 isd =12.15m 2 , the water flow area is A w =0.00407m 2 According to formula (1-4), the moisture separation coefficient ξ=2.30. The heat transfer coefficient is determined by the assumed flow rate method, and 1.2m / s is preselected within the economic flow rate range. Substituting the above calculation results into the formula, we can get

[0101] According to formula (1-6), W = 0.00407 × 1.2 × 10 3 =4.88kg / s. According to formulas (1-7) and (1-8), we can get NTU = 1.20, C r =0.11, check the corresponding ε-NTU and C r The corresponding curve yields ε2 = 0.71. From formulas (1-9) and (1-10), we can see that the initial temperature of the chilled water is 9.9°C and the final temperature of the chilled water is 13.5°C.

[0102] The size of the coil air handling device 14 can be designed according to 8 rows of chilled water pipes during design. During normal operation of the specific project, 4 rows are opened and when the air volume needs to be increased, all rows are opened.

[0103] Example 3

[0104] Assuming the wind speed is 5-6.5m / s, select the size according to the air volume. The fresh air volume is 1.7kg / s, the total air volume is 5.55kg / s, of which the exhaust air volume is 0.56kg / s. According to the "Practical Heating and Air Conditioning Design Manual", the diameter of the fresh air duct is selected as 1250×250, the diameter of the return air duct is 1250×630, and the diameter of the exhaust air duct is 320×320. When the exhaust duct pipe length is small, such as the return air duct in the machine room directly leads to the outside for exhaust. The exhaust duct diameter and the return air duct diameter are selected in accordance with the same. When the exhaust duct pipe length is long, the exhaust duct diameter can be designed in the form of a large pipe sleeve small pipe. The external pipe has the same diameter as the return air duct, and the internal duct is the same as the original exhaust duct. The fan is reversed and the large pipe is used to extract the outdoor fresh air to achieve a new air operation.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air handling system based on a combined coil air handling device, characterized in that: The combined coil air treatment device comprises a shell (1), wherein a detachable vertical baffle (4) is arranged inside the shell (1), and the vertical baffle (4) is perpendicular to the front wall (1-3) of the shell (1); one side of the vertical baffle (4) is a first compartment (5), and the other side is a second compartment (3); A fresh air inlet (10) is provided on the front wall (1-3) of the first compartment (5), and a return air inlet (11) is provided on the front wall (1-3) of the second compartment (3); a fresh air outlet is provided on the rear wall (1-6) of the first compartment (5), and a return air outlet is provided on the rear wall (1-6) of the second compartment (3); a plurality of fresh air segment ribs (7) are detachably provided in the first compartment (5), and a plurality of return air segment ribs (2) are detachably provided in the second compartment (3); a coil (6) is provided in the housing (1), and the coil (6) passes through the fresh air segment ribs (7), the vertical baffles (4) and the return air segment ribs (2); The fresh air inlet (10) is connected to a fresh air inlet pipe (25), and the fresh air outlet is connected to a fresh air outlet pipe (16); the return air inlet (11) is connected to a return air inlet pipe (20), and the return air outlet is connected to a return air outlet pipe (17); a reverse fan (21) is provided on the return air inlet pipe (20), the return air inlet pipe (20) is connected to a return air main pipe (28), and a third valve (22) is provided at the connection between the return air inlet pipe (20) and the return air main pipe (28), and the third valve (22) is a three-way valve; The fresh air inlet (10) is located at the center of the front wall (1-3) of the first compartment (5), and the return air inlet (11) is located at the center of the front wall (1-3) of the second compartment (3).

2. The air handling system based on the combined coil air handling device according to claim 1, characterized in that: The thickness of the fresh air section ribs (7) and the return air section ribs (2) are both 0.2-0.4 mm.

3. The air handling system based on the combined coil air handling device according to claim 1, characterized in that: The fresh air section ribs (7) are arranged at equal intervals, and the distance between adjacent fresh air section ribs (7) is 2.4-3.2 mm; the return air section ribs (2) are arranged at equal intervals, and the distance between adjacent return air section ribs (2) is 2.4-3.2 mm.

4. The air handling system based on the combined coil air handling device according to claim 1, characterized in that: The fresh air section ribs (7) are wavy along their length direction, and the return air section ribs (2) are serrated along their length direction.

5. The air handling system based on the combined coil air handling device according to claim 1, characterized in that: The vertical baffle (4), the fresh air section ribs (7) and the return air section ribs (2) are all provided with holes, and the holes are used to pass the coil (6).

6. The air handling system based on the combined coil air handling device according to claim 1, characterized in that: The return air inlet pipe (20) is provided with a second valve (19); the fresh air inlet pipe (25) is connected to the return air inlet pipe (20) via a connecting pipe (27); the connecting pipe (27) and the return air inlet pipe (20) are connected before the second valve (19); and a fifth valve (26) is provided on the connecting pipe (27).

7. The air handling system based on the combined coil air handling device according to claim 1, characterized in that: The fresh air outlet pipe (16) is provided with a second fan (18), the return air outlet pipe (17) is provided with a first fan (15), and the return air main pipe (28) is provided with a return air fan (24).

8. A method for using the air treatment system based on the combined coil air treatment device according to claim 1, characterized in that: When the fresh air inlet pipe (25) and the return air inlet pipe (20) of the system both take in air, the fresh air enters the first compartment (5) through the fresh air inlet pipe (25) and is cooled before being discharged through the fresh air outlet pipe (16); the return air enters the second compartment (3) through the return air main pipe (28) and the return air inlet pipe (20) and is cooled before being discharged through the return air outlet pipe (17); When the indoor fresh air volume needs to be increased, the fresh air enters the first compartment (5) through the fresh air inlet pipe (25), is cooled, and is then discharged through the fresh air outlet pipe (16); the third valve (22) connects the discharge end of the return air main pipe (28) and the return air inlet pipe (20), and the reverse fan (21) works to drive the fresh air from the discharge end of the return air main pipe (28) into the return air inlet pipe (20), and then is cooled in the second compartment (3) and discharged through the return air outlet pipe (17).

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