Ventilation cooling device and application method thereof

Abstract

The invention discloses a ventilation cooling device and an application method thereof, and relates to the technical field of construction cooling. The ventilation cooling device comprises a heat preservation air bin, a first water tank, a second water tank, a first-stage cooling coil and a second-stage cooling coil, an air inlet and an air outlet are formed in the two opposite side faces of the heat preservation air bin, the bent portion of the first-stage cooling coil is arranged on the side, close to the air inlet, in the heat preservation air bin, and the extending portion of the first-stage cooling coil is inserted into the first water tank. An ice-water mixture is contained in the first water tank, the bent portion of the second-stage cooling coil is arranged on the side, close to the air outlet, in the heat preservation air bin, the extending portion of the second-stage cooling coil is inserted into the second water tank, and the second water tank collects redundant ice water in the first water tank. Through two-stage cooling of the first-stage cooling coil pipe and the second-stage cooling coil pipe, the cooling capacity utilization rate of ice blocks is increased, and the cooling effect of air flow is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction cooling, and in particular to a ventilation and cooling device and an application method thereof. Background Art

[0002] With the implementation of the strategy of building a strong transportation nation, my country's tunnel construction faces many challenges such as high altitude, high ground temperature and long distance. High temperature environment will lead to the deterioration of the construction environment, threaten the health and safety of construction workers, reduce the stability of equipment and deteriorate the tunnel structure.

[0003] Ventilation can effectively reduce the temperature of the construction environment and is a necessary means to ensure the tunnel construction environment. However, conventional ventilation methods cannot meet the cooling needs of the tunnel construction working surface and need to be combined with auxiliary cooling measures. Ice cooling is a commonly used auxiliary cooling method in construction. However, traditional ice cooling is to place ice directly near the working surface. The ice has a low cooling rate and a small cooling range. In addition, the cold water is directly discharged after the ice melts, resulting in a huge waste of cooling. Summary of the invention

[0004] The invention provides a ventilation cooling device and an application method thereof, so as to solve the problems of low cold capacity utilization rate and limited cooling range for ice cube assisted cooling in current construction cooling.

[0005] The present invention is achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a ventilation and cooling device, comprising:

[0007] A heat preservation air bin, wherein an air inlet and an air outlet are arranged on two opposite sides of the heat preservation air bin;

[0008] A first water tank, used for containing an ice-water mixture;

[0009] a second water tank, connected to the first water tank, and used to collect excess ice water in the first water tank;

[0010] The first stage cooling coil comprises a first bent portion and a first extending portion, wherein the first bent portion is arranged in the heat preservation air bin and on one side close to the air inlet, and the first extending portion extends out of the heat preservation air bin and is inserted into the first water tank;

[0011] The second-stage cooling coil includes a second bent portion and a second extended portion. The second bent portion is arranged in the thermal insulation air bin and on one side close to the air outlet. The second extended portion extends out of the thermal insulation air bin and is inserted into the second water tank.

[0012] The device of the present invention utilizes ice cubes to assist ventilation and cooling, solves the problem that there is no better device that can fully utilize the cooling capacity of ice cubes at present, and fully utilizes the cooling capacity of ice cubes through the air cooling device of the two-stage cooling coil, and improves the cooling capacity. The cooling principle is as follows: the high-speed wind flow enters the heat preservation wind bin from the air inlet, the wind speed is reduced in the heat preservation wind bin, the low-speed wind flow first passes through the first-stage cooling coil, the first-stage cooling coil uses the ice-water mixture as the cold source, because the temperature of the ice-water mixture is always kept at 0°, the first-stage cooling has a good cooling effect, as the ice cubes in the first water tank melt and new ice materials are added during use, the excess ice water in the first water tank enters the second water tank through the connecting part, the second-stage cooling coil uses the ice water in the second water tank as the cold source, and performs secondary cooling on the low-speed wind flow in the heat preservation wind bin, although the temperature of the ice water increases after heat exchange, there is still available cold capacity, so the wind flow cooled by the two-stage cooling coil is transported out from the air outlet, and the ventilation and cooling of the construction environment is realized. The ventilation and cooling device of the present invention can improve the utilization rate of ice cubes and fully exchange heat with wind flow. The cooled wind flow is transported from the air outlet to the construction environment, and a larger range of cooling is achieved with the flow of cooling wind.

[0013] In some embodiments, a water level sensor is disposed in the first water tank, a control valve is disposed on the connecting portion between the first water tank and the second water tank, and the water level sensor establishes communication with the control valve;

[0014] When the water level of the first water tank is higher than a preset water level, the control valve is opened, and when the water level of the first water tank is lower than the preset water level, the control valve is closed.

[0015] In some embodiments, a drain outlet is provided in the second water tank at a certain height from the ground.

[0016] In some embodiments, the device further includes a feeding device, which includes an ice hopper, an ice crusher, and a belt conveyor; the ice machine is arranged at the discharge port of the ice hopper, one end of the belt conveyor is connected to the ice discharge port of the ice crusher, and the other end of the belt conveyor is connected to the first water tank.

[0017] In some embodiments, the device further includes a relay fan, and the relay fan is disposed at an air outlet of the thermal insulation air bin.

[0018] In some embodiments, the bottom plate of the thermal insulation air bin is detachable.

[0019] In some embodiments, the device further comprises a movable bracket, a mounting seat is provided on the bottom plate of the thermal insulation air bin, and the movable bracket is detachably connected to the mounting seat.

[0020] In some embodiments, the first stage cooling coil and the second stage cooling coil are designed by the following selection method:

[0021] S1, obtain the air flow rate q and inlet air temperature T in the insulation air cabin f-0 , delivered ice temperature t, first water tank temperature t1, second water tank temperature t2, total cooling capacity Q;

[0022] S2, according to the known conditions of S1, look up the enthalpy difference △H1 of the first water tank and the enthalpy difference △H2 of the second water tank in the enthalpy value table, and then calculate the cooling capacity Q1 of the first water tank and the cooling capacity Q2 of the second water tank by combining △H1 and △H2;

[0023] S3, according to the cooling capacity and the wind heat dissipation being equal, the wind heat dissipation of the first stage cooling is obtained to be Q1'=Q1, and the wind heat dissipation of the second stage cooling is obtained to be Q2'=Q2. According to the wind heat dissipation calculation formula, the enthalpy difference △H3 of the first stage cooling and the enthalpy difference △H4 of the second stage cooling are obtained;

[0024] S4, according to the enthalpy difference △H3 of the first stage cooling, look up the enthalpy value table to obtain the wind temperature T after the first stage cooling f-1 According to the enthalpy difference △H4 of the second stage cooling, the wind temperature T after the second stage cooling is obtained by looking up the enthalpy value table f-2 ;

[0025] S5, according to the inlet air temperature T f-0 , air temperature after first stage cooling T f-1 , air flow q and cooling capacity Q. Select the appropriate first-stage cooling coil model in the specification GB / T19232-2019 "Fan Coil Unit". According to the air temperature T after the first stage cooling, f-1 , air temperature after second stage cooling T f-2 , air flow rate q and cooling capacity Q, select the appropriate second-stage cooling coil model in the specifications.

[0026] In some implementations, the calculation of the cooling capacity Q1 of the first water tank and the cooling capacity Q2 of the second water tank in combination with ΔH1 and ΔH2 is specifically:

[0027] According to the formula Q = (△H1 + △H2) * q 水 , calculate the mass flow rate q of the drainage 水 , where Q is the total cooling capacity, △H1 is the enthalpy difference of the first water tank, and △H1 is the enthalpy difference of the second water tank;

[0028] Calculate the cooling capacity Q1 of the first water tank and the cooling capacity Q2 of the second water tank using the following formula:

[0029]

[0030]

[0031] Among them, △H1 is the enthalpy difference of the first water tank, and △H2 is the enthalpy difference of the second water tank.

[0032] A second aspect of the present invention provides a method for ventilating and cooling a tunnel construction working face using the ventilation and cooling device according to any one embodiment of the first aspect of the present invention, comprising:

[0033] Build the ventilation and cooling device according to the construction site, and direct the air outlet toward the working surface to be cooled;

[0034] Adding an ice-water mixture into the first water tank;

[0035] A high-speed airflow is introduced into the air inlet, and the airflow is cooled by two-stage cooling coils in the heat-insulating air bin. The cooled airflow is then sent out from the air outlet to cool the working surface.

[0036] During the cooling process, ice is added to the first water tank according to the consumption of ice cubes in the first water tank.

[0037] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0038] The ventilation and cooling device of the present invention directly uses ice cubes as a cold source and uses an ice-water mixture to cool the airflow, thereby increasing the cold release rate of the ice cubes and making full use of the cold capacity of the ice cubes. In addition, the cold capacity directly acts on the fresh air, significantly increasing the cooling range of the ice cubes. The first stage cooling of the device can solve the problem of low cold release rate of ice cubes, and the second stage cooling can improve the utilization rate of ice cold capacity. In addition, the present invention proposes a device selection method based on inlet air temperature, air volume and target cooling capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0040] Figure 1 It is a structural schematic diagram of a ventilation and cooling device according to an embodiment of the present invention;

[0041] Figure 2 It is a schematic flow chart of a method for selecting a first-stage cooling coil according to an embodiment of the present invention;

[0042] Figure 3 It is a schematic flow chart of a method for selecting a second-stage cooling coil according to an embodiment of the present invention;

[0043] Figure 4 It is a flow chart of a ventilation and cooling method according to an embodiment of the present invention.

[0044] The following are the descriptions of the reference numerals:

[0045] 1-insulated air bin, 2-first water tank, 3-second water tank, 4-first stage cooling coil, 5-second stage cooling coil, 11-air inlet, 12-air outlet, 13-bottom plate, 41-first bending portion, 42-first extension portion, 51-second bending portion, 52-second extension portion, 6-control valve, 71-ice hopper, 72-ice crusher, 73-belt conveyor, 8-relay fan, 32-drain outlet. DETAILED DESCRIPTION

[0046] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0047] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to or inherent to other steps or units of the device.

[0048] The terms used in the various embodiments of the application are only used to describe the purpose of specific embodiments and are not intended to limit the various embodiments of the application. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meanings commonly understood by ordinary technicians in the field of the various embodiments of the application. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the application.

[0049] The embodiments of the present invention provide a ventilation and cooling device and an application method thereof, which are suitable for scenes such as construction sites where ice cubes are usually required to assist ventilation and cooling, and are conducive to making full use of the cooling capacity of ice cubes, saving ice cube consumption, and improving the environmental cooling effect.

[0050] See also Figure 1 As shown, the ventilation and cooling device of the present invention includes a heat-insulating wind bin 1, a first water tank 2, a second water tank 3, a first-stage cooling coil 4 and a second-stage cooling coil 5.

[0051] An air inlet 11 and an air outlet 12 are arranged on opposite sides of the heat preservation air silo 1. The air inlet 11 and the air outlet 12 are arranged relative to each other, which can reduce the wind loss of the airflow from the air inlet 11 to the air outlet 12. The cross-sectional shape of the heat preservation air silo 1 is not limited, and a ventilation duct with a certain length is formed between the air inlet 11 and the air outlet 12, so as to accommodate the first-stage cooling coil 4 and the second-stage cooling coil 5. After the high-speed airflow enters from the air inlet 11, the wind speed is reduced after the expanded duct, so that heat exchange occurs with the first-stage cooling coil 4 and the second-stage cooling coil 5, and the cooled airflow is output from the air outlet 12 to cool the environment.

[0052] The cross-sectional shapes of the air inlet 11 and the air outlet 12 are not limited, and are preferably non-obtuse shapes such as circles or ellipses. The air inlet 11 and the air outlet 12 may be set to have the same cross-sectional area to ensure that the inlet and outlet wind speeds are equal, or the cross-sectional area of ​​the air outlet is smaller than the cross-sectional area of ​​the air inlet to increase the outlet wind speed. The air inlet 11 or the air outlet 12 may be set as an opening on the side of the heat preservation air bin 1, or may be set as an air inlet duct or an air outlet duct extending from the side opening.

[0053] The heat preservation air bin 1, the first water tank 2, and the second water tank 3 are installed according to the application environment. The heat preservation air bin 1 can be erected in the cooling environment through a ground support frame and maintained at a certain height from the ground, so that the cooling air flow gradually sinks at a certain height after being output from the air outlet 12, thereby cooling the surrounding environment. The first water tank 2 and the second water tank 3 are installed near the heat preservation air bin 1, and corresponding mounting seats can be provided to stabilize their positions, or they can be directly placed on the ground plane.

[0054] The first water tank 2 is used to hold an ice-water mixture as a cold source for the first-stage cooling coil 4. The second water tank 3 is connected to the first water tank through a pipeline so that the ice water in the first water tank flows into the second water tank. The installation distance between the first water tank 2 and the second water tank 3 should be appropriate. The ice water in the second water tank is used as a cold source for the second-stage cooling coil 5 to achieve the reuse of the ice water.

[0055] The first stage cooling coil 4 includes a first curved portion 41 and a first extension portion 42. The first extension portion is a straight pipe extending from the coil of the first curved portion 41. When in use, the first curved portion 41 is located in the thermal insulation wind bin 1, and the first extension portion 42 extends from the bottom of the thermal insulation wind bin 1 and is inserted into the first water tank 2. Accordingly, the bottom of the thermal insulation wind bin 1 should be provided with an opening for the first extension portion 42 to extend out. The first extension portion 42 introduces the cold source into the first curved portion 41, and the first curved portion 41 is close to one side of the air inlet 11, thereby performing primary cooling on the airflow entering the thermal insulation wind bin.

[0056] The second stage cooling coil 5 includes a second bend 51 and a second extension 52. The second extension 52 is a straight tube extending from the coil of the second bend 51. When in use, the second bend 51 is located on the side of the insulation wind bin close to the air outlet 12, that is, between the first bend 41 of the first stage cooling coil and the air outlet 12. The second extension 52 extends from the bottom of the insulation wind bin 1 and is inserted into the second water tank. Correspondingly, the bottom of the insulation wind bin 1 should be provided with an opening for the second extension to extend. The second extension 52 introduces the ice water cooling source in the second water tank into the second bend 51, and the second bend performs secondary cooling on the airflow that has undergone primary cooling to further reduce the temperature of the airflow.

[0057] The water inlet pipe and the water outlet pipe of the first stage cooling coil 4 are both arranged in the first extension part 42, and the circulating water channel is arranged in the first curved part 41. One end of the circulating water channel is connected to the water inlet pipe, and the other end is connected to the water outlet pipe. The water inlet and the water outlet of the water inlet pipe are both connected to the first water tank. The working principle of the first stage cooling coil 4 is as follows: the water in the first water tank is pumped into the water inlet pipe by a water pump at the water inlet position, and the water flows through the water inlet pipe of the first extension part into the circulating water channel of the first curved part, flows along the circulating water channel, keeps the cold in the first curved part, and has the first stage heat exchange with the wind flow in the thermal insulation wind bin, and the water flows out from the water outlet pipe and finally returns to the first water tank.

[0058] The working principle of the second stage cooling coil 5 is the same. A water inlet pipe and a water outlet pipe are provided in the second extension 52 of the second stage cooling coil 5, and a circulating water channel is provided in the second curved portion 51. One end of the circulating water channel is connected to the water inlet pipe, and the other end is connected to the water outlet pipe. The water inlet and the water outlet of the water inlet pipe are both connected to the second water tank. A water pump is provided at the water inlet, and the water in the second water tank is pumped into the water inlet pipe by the water pump. The water flows through the water inlet pipe of the second extension part and enters the circulating water channel of the second curved portion. The water flows along the circulating water channel, keeps the cold in the second curved portion, and undergoes a second stage of heat exchange with the wind flow in the thermal insulation wind bin. The water then flows out from the water outlet pipe and finally returns to the second water tank.

[0059] Among them, the height of the water outlet in the water tank can be set to be lower than the height of the water inlet. In this way, since the density of water increases with the decrease in temperature, the water that has undergone heat exchange remains in the upper part of the water tank when it flows out of the water outlet, while the water drawn into the water inlet pipe is in the lower part of the water tank. When the water level of the water tank rises, the excess water in the first water tank enters the second water tank through the connecting part.

[0060] The cooling principle of the device is as follows: add ice-water mixture to the first water tank as the cold source of the first-stage cooling coil, and add ice cubes to the first water tank during the use of the device. A high-speed airflow is introduced into the air inlet 11, and the high-speed airflow enters the thermal insulation wind bin 1 from the air inlet 11. As the cross-sectional area of ​​the air duct in the thermal insulation wind bin 1 increases, the wind speed entering the thermal insulation wind bin 1 decreases. The low-speed airflow first passes through the first-stage cooling coil for heat exchange. As the temperature is lowered, the newly added ice cubes and the melting of the ice cubes cause the water level of the first water tank to rise, and the excess ice water enters the second water tank through the connecting pipe. The ice water in the second water tank provides a cold source for the second-stage cooling coil. The low-speed airflow passes through the second-stage cooling coil for heat exchange and is finally discharged from the air outlet 12.

[0061] The ventilation and cooling device of the present invention is easy to build and has no special requirements for the use site. The heat-insulating air bin, the first water tank, the second water tank and even the cooling coil can be replaced, disassembled and reassembled.

[0062] In some embodiments, a feeding device is also provided to facilitate the feeding of ice. Figure 1 As shown, the feeding device includes an ice hopper 71, an ice crusher 72 and a belt conveyor 73. The ice crusher 72 is arranged at the discharge port of the ice hopper 71, one end of the belt conveyor 73 is connected to the ice discharge port of the ice crusher 72, and the other end is connected to the first water tank 2, so that crushed ice can be easily put into the first water tank.

[0063] The ice crushing process is as follows: ice cubes are first put into the ice hopper 71 and then enter the ice crusher 72. The ice crusher 72 makes the ice cubes into crushed ice, and the crushed ice is put into the first water tank 2 through the belt conveyor 73.

[0064] Since the first water tank 2 is connected to the second water tank 3 , when the water level of the first water tank exceeds the height of the connecting portion, the excess ice water automatically flows into the second water tank.

[0065] In some embodiments, the connecting portion is disposed at 1 / 2 to 3 / 4 of the height of the first water tank, so that a suitable water level is maintained in the first water tank, the water level is not too low to provide a sufficient cold source, and a certain amount of space is left for placing ice.

[0066] Furthermore, a drain outlet 32 ​​is also provided at a certain height in the second water tank, preferably at 1 / 2 to 3 / 4 of the height of the second water tank. When the water level in the second water tank exceeds the height of the drain outlet, the ice water is automatically discharged.

[0067] The drain port is set at a certain height of the water tank to drain the water in the upper part of the water tank. The water in the upper part of the water tank is the water discharged after heat exchange. The excess water in the upper part is discharged first, so as to keep the remaining water in the water tank at a lower temperature. Excess water is discharged through the drain port to prevent excess water from overflowing from the water tank opening into the environment.

[0068] In some embodiments, a control valve 6 is provided on the connection portion between the first water tank 2 and the second water tank 3. When crushed ice is put into the first water tank, the control valve 6 opens, and the water in the first water tank flows into the second water tank to keep the water level in the first water tank unchanged. The water in the second water tank that exceeds the water level is discharged from the drain port.

[0069] In some embodiments, a water level sensor is provided in the first water tank, and the water level sensor establishes communication with the control valve 6. When the water level sensor detects that the water level of the first water tank is higher than a preset water level, the control valve 6 is opened, and when the water level sensor detects that the water level of the first water tank is lower than a preset water level, the control valve 6 is closed. Through the linkage between the water level sensor and the control valve, there is no need to pay attention to the water level or the feeding time, and there is no need to manually adjust the valve.

[0070] In some embodiments, a relay fan 8 is further provided at the air outlet 12. The relay fan extracts the cooling airflow in the heat preservation air bin 1 to speed up the air outlet. Increasing the air outlet speed promotes the diffusion of the cooling airflow in the environment and speeds up the cooling of the environment.

[0071] In some embodiments, the bottom plate 13 of the heat preservation air bin 1 is detachable. Since the first curved portion of the first-stage cooling coil and the second curved portion of the second-stage cooling coil need to be installed in the heat preservation air bin 1, and the first extension portion of the first-stage cooling coil and the second extension portion of the second-stage cooling coil need to extend from the bottom of the heat preservation air bin and be inserted into the water tank, the bottom plate 13 of the heat preservation air bin is detachably connected to the main body of the heat preservation air bin, so that the first-stage cooling coil and the second-stage cooling coil can be easily installed, disassembled, and replaced.

[0072] In some embodiments, in order to facilitate the installation of the ventilation and cooling device in a construction environment, a movable bracket is provided for supporting the heat preservation air bin. A corresponding mounting seat is provided on the bottom plate of the heat preservation air bin, and the movable bracket is detachably connected to the mounting seat.

[0073] In order to make full use of wind flow and ice cubes for cooling, the present invention also provides a coil selection design based on inlet air temperature, air volume and target cooling capacity. Figure 2 The figure shows a schematic diagram of the selection method of the first stage cooling coil, which includes the following steps:

[0074] S1-1, obtain the air flow rate q in the insulation air cabin and the air temperature T at the air inlet f-0 , the temperature of the delivered ice is t, the temperature of the first water tank is t1, the temperature of the second water tank is t2, and the total refrigeration capacity is Q.

[0075] The air volume is determined by the incoming air flow rate. If the wind speed at the air inlet is constant, the air flow rate q is a certain value. The wind temperature at the air inlet, that is, the original speed of the air flow, can be obtained through experimental measurement. The temperature of the ice cubes can be -4°C according to the actual situation. The first water tank contains an ice-water mixture, so the temperature of the first water tank is 0°. The temperature in the second water tank, that is, the temperature of the ice water after heat exchange, must be higher than 0°.

[0076] S1-2, according to the known conditions of S1-1, look up the enthalpy difference △H1 of the first water tank and the enthalpy difference △H2 of the second water tank in the enthalpy value table, and then combine the enthalpy differences to calculate the cooling capacity Q1 and Q2 of the two water tanks.

[0077] Specifically, first, according to the known conditions, the enthalpy value table is consulted to obtain the enthalpy difference △H1 of the first water tank and the enthalpy difference △H2 of the second water tank. According to the formula Q = (△H1 + △H2) * q 水 , then we can find q 水 ,q 水 is the mass flow rate of drainage (kg / s), and then the ice delivery rate v = q 水 / t;

[0078] Then calculate the cooling capacity Q1 of the first water tank according to the following formula.

[0079] The cooling capacity of the first water tank is calculated as:

[0080] S1-3, ignoring the system energy loss, making the cooling capacity approximately equal to the wind heat dissipation, obtaining the wind heat dissipation of the first stage cooling and the wind heat dissipation of the second stage cooling, and then calculating the enthalpy difference of the first stage cooling based on the heat dissipation.

[0081] According to the law of conservation of energy, the cooling capacity is equal to the heat dissipation of the wind flow, that is:

[0082] Q1=Q1'

[0083] Wherein, Q1' represents the heat dissipation of the wind flow in the first stage of cooling.

[0084] According to the formula of the heat dissipation of the first-stage cooling airflow, the enthalpy difference of the first-stage cooling can be obtained as follows:

[0085] Q1'=△H3*q

[0086] Among them, △H3 represents the enthalpy difference of the first stage cooling, and q is the air flow rate in the thermal insulation air cabin.

[0087] S1-4, according to the enthalpy difference of the first stage cooling, look up the enthalpy value table to obtain the wind temperature T after the first stage cooling f-1 .

[0088] S1-5, according to the specification GB / T 19232-2019 "Fan Coil Unit", it is known that T f-0 , T f-1 , select the appropriate first-stage cooling coil model based on the air flow rate q and total cooling capacity Q in the specification.

[0089] Coil selection is mainly to design the bending parts of the first-stage cooling coil and the second-stage cooling coil to meet the cooling capacity required for heat exchange, while the coil extension can be set according to installation needs.

[0090] The selection of the second stage cooling coil adopts the same principle, such as Figure 3 The figure shows a flow chart of the method for selecting the second-stage cooling coil, including steps S2-1 to S2-5. The first two steps are the same as S1-1 and S1-2.

[0091] Step S2-2 is to calculate the cooling capacity Q2 of the second water tank, and the calculation formula is:

[0092]

[0093] Among them, △H1 is the enthalpy difference of the first water tank, and △H2 is the enthalpy difference of the second water tank.

[0094] Step S2-3 is to calculate the heat dissipation of the wind flow of the second stage cooling according to the law of energy conservation, and the formula is:

[0095] Q2=Q2'

[0096] Among them, Q2' is the wind flow heat dissipation of the second stage cooling, and Q2 is the cooling capacity of the second water tank.

[0097] According to the heat dissipation formula of the second-stage cooling, the enthalpy difference of the second-stage cooling can be obtained as follows:

[0098] Q2'=△H4*q

[0099] Among them, △H4 represents the enthalpy difference of the second stage cooling, and q is the air flow rate in the thermal insulation air cabin.

[0100] Step S2-4, according to the enthalpy difference of the second stage cooling, look up the enthalpy value table to obtain the wind temperature T after the second stage cooling f-2 .

[0101] Step S2-5, according to the specification GB / T 19232-2019 "Fan Coil Unit", it is known that T f-1 , T f-2 , select the appropriate second-stage cooling coil based on the air flow rate q and cooling capacity Q in the specifications.

[0102] Through the above selection method, the appropriate coil selection and design can be carried out according to the actual application requirements. The detachable bottom plate of the cooling air bin can realize convenient coil assembly and replacement. The selection and design can be carried out for the first cooling coil alone, or the second cooling coil, or both, just by combining the 2nd to 5th steps in the above selection schemes.

[0103] The embodiment of the present invention also provides a ventilation and cooling method for a tunnel construction working face, see Figure 4 As shown, Figure 4 2 is a flow chart of a ventilation and cooling method, and the ventilation and cooling device using any of the above embodiments of the present invention is as follows.

[0104] S3-1, first set up the ventilation and cooling device according to the site of use, and point the air outlet towards the working surface to be cooled.

[0105] S3-2, adding ice-water mixture into the first water tank.

[0106] S3-3, high-speed airflow is introduced into the air inlet. The device cools the airflow through two-stage cooling coils in the heat-insulating air bin, and the cooled airflow is sent out from the air outlet to cool the working surface.

[0107] S3-4, during the cooling process, ice is added to the first water tank according to the consumption of ice cubes in the first water tank to achieve continuous cooling.

[0108] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A ventilation and cooling device, characterized in that: include: A heat preservation air bin (1), wherein an air inlet (11) and an air outlet (12) are arranged on two opposite sides of the heat preservation air bin; A first water tank (2) for containing an ice-water mixture; A second water tank (3), which is in communication with the first water tank (2) and is used to collect excess ice water in the first water tank (2); The first-stage cooling coil (4) comprises a first bent portion (41) and a first extending portion (42), wherein the first bent portion (41) is arranged in the heat-insulating air bin (1) on a side close to the air inlet (11), and the first extending portion (42) extends out of the heat-insulating air bin (1) and is inserted into the first water tank (2); The second-stage cooling coil (5) comprises a second bent portion (51) and a second extended portion (52), wherein the second bent portion (51) is arranged inside the heat-insulating air bin (1) on a side close to the air outlet (12), and the second extended portion (52) extends out of the heat-insulating air bin (1) and is inserted into the second water tank (3).

2. The ventilation and cooling device according to claim 1, characterized in that: A water level sensor is arranged in the first water tank (2), a control valve (6) is arranged on the connecting portion between the first water tank (2) and the second water tank (3), and the water level sensor establishes communication with the control valve (6); When the water level of the first water tank (2) is higher than a preset water level, the control valve (6) is opened, and when the water level of the first water tank (2) is lower than the preset water level, the control valve (6) is closed.

3. The ventilation and cooling device according to claim 1, characterized in that: The second water tank (3) is provided with a drainage outlet (31) at a certain height from the ground.

4. The ventilation and cooling device according to claim 1, characterized in that: The device further comprises a feeding device, which comprises an ice hopper (71), an ice crusher (72), and a belt conveyor (73); the ice machine (72) is arranged at the discharge port of the ice hopper (71), one end of the belt conveyor (73) is connected to the ice discharge port of the ice crusher (72), and the other end of the belt conveyor (73) is connected to the first water tank (2).

5. The ventilation and cooling device according to claim 1, characterized in that: The device also includes a relay fan (8), which is arranged at the air outlet (12) of the heat-insulating air bin (1).

6. The ventilation and cooling device according to claim 1, characterized in that: The bottom plate (13) of the heat-insulating air bin (1) is detachable.

7. The ventilation and cooling device according to claim 6, characterized in that: The device also includes a movable bracket, a mounting seat is provided on the bottom plate (13) of the heat-insulating air bin (1), and the movable bracket is detachably connected to the mounting seat.

8. The ventilation and cooling device according to claim 1, characterized in that: The first stage cooling coil (4) and the second stage cooling coil (5) are designed by the following selection method: S1, obtain the air flow rate q and inlet air temperature T in the insulation air cabin f-0 , delivered ice temperature t, first water tank temperature t1, second water tank temperature t2, total cooling capacity Q; S2, according to the known conditions of S1, look up the enthalpy difference △H1 of the first water tank and the enthalpy difference △H2 of the second water tank in the enthalpy value table, and then calculate the cooling capacity Q1 of the first water tank and the cooling capacity Q2 of the second water tank by combining △H1 and △H2; S3, according to the cooling capacity and the wind heat dissipation being equal, the wind heat dissipation of the first stage cooling is obtained to be Q1'=Q1, and the wind heat dissipation of the second stage cooling is obtained to be Q2'=Q2. According to the wind heat dissipation calculation formula, the enthalpy difference △H3 of the first stage cooling and the enthalpy difference △H4 of the second stage cooling are obtained; S4, according to the enthalpy difference △H3 of the first stage cooling, look up the enthalpy value table to obtain the wind temperature T after the first stage cooling f-1 According to the enthalpy difference △H4 of the second stage cooling, the wind temperature T after the second stage cooling is obtained by looking up the enthalpy value table f-2 ; S5, according to the inlet air temperature T f-0 , air temperature after first stage cooling T f-1 , air flow q and cooling capacity Q. Select the appropriate first-stage cooling coil model in the specification GB / T19232-2019 "Fan Coil Unit". According to the air temperature T after the first stage cooling, f-1 , air temperature after second stage cooling T f-2 , air flow rate q and cooling capacity Q, select the appropriate second-stage cooling coil model in the specifications.

9. The ventilation and cooling device according to claim 8, characterized in that: The cooling capacity Q1 of the first water tank and the cooling capacity Q2 of the second water tank are calculated by combining ΔH1 and ΔH2, specifically: According to the formula Q = (△H1 + △H2) * qwater, the mass flow rate of drainage qwater is calculated, where Q is the total cooling capacity, △H1 is the enthalpy difference of the first water tank, and △H2 is the enthalpy difference of the second water tank; Calculate the cooling capacity Q1 of the first water tank and the cooling capacity Q2 of the second water tank using the following formula: Among them, △H1 is the enthalpy difference of the first water tank, and △H2 is the enthalpy difference of the second water tank.

10. A method for ventilating and cooling a tunnel construction working face using the ventilating and cooling device according to any one of claims 1 to 9, characterized in that: include: Build the ventilation and cooling device according to the construction site, and direct the air outlet toward the working surface to be cooled; Adding an ice-water mixture into the first water tank; A high-speed airflow is introduced into the air inlet, and the airflow is cooled by two-stage cooling coils in the heat-insulating air bin. The cooled airflow is then sent out from the air outlet to cool the working surface. During the cooling process, ice is added to the first water tank according to the consumption of ice cubes in the first water tank.

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