Device for heat-moisture treatment of air

 

The invention relates to techniques for ventilation and air-conditioning, in particular to devices for heat and humidity of the treated air. The device comprises a nozzle of the spray chamber with the sump, inlet and outlet nozzles with plate separators and pipe risers with nozzles. Jet spray chamber contains parallel-sided nozzle, installed in the lower part of her work space, while the height of the nozzle is 0.3-0,33 height of the working chamber irrigation. The technical result of the invention is to improve the efficiency of the heat and humidity of the treated air. Achieved optimal hydrodynamic conditions of contact interaction environments at the bottom of the camera irrigation. 3 Il.

The invention relates to techniques for ventilation and air-conditioning, in particular to devices for heat and humidity of the treated air.

The known device for heat-moisture treatment of air by spraying water into the air stream by means of nozzles (C. N. Theological, L. C. Petrov, O. I. Kokorin. “Air conditioning and refrigeration”. - M.: stroiizdat, 1985, S. 194-198). the due to the low intensity of processes of heat and moisture exchange due to violations of the hydrodynamic conditions of the interaction of air and water on the section height of the camera irrigation, especially in the lower part of the workspace.

Closest to the claimed technical essence and the achieved effect is a device for heat-moisture treatment of air containing the nozzle of the spray chamber with the pallet, the input and output air ducts with plate separators and pipe risers with nozzles (A. C. of the USSR №1020715, F 24 F 3/14, 1983 - prototype).

A disadvantage of the known device is the low efficiency of the heat and humidity of the treated air. This is due to the low intensity of processes of heat and moisture exchange due to violations of the hydrodynamic conditions of the interaction of air and water on the section height of the camera irrigation, especially in its lower part. In particular, the water droplets comprising the spray nozzles only at the initial stage of interaction have involuntary movement under the action of inertia forces. In a further drop of water under the action of aerodynamic forces of the air flow moving along the camera irrigation and at the same time under the action of gravity down (Andreev I. E. the Calculation of heat and mass transfer in the contact apparatus. - L.: Energoatomizdat, 1985, S. 10-11), resulting in any event increase the amount of water in the nigo is considered volumetric average value of the coefficient of irrigation Incf. If we divide the working chamber irrigation into three zones according to the height of the living section, then we can talk about the local values of the coefficient of irrigation InLokin each of the zones (Fig.2). So, at the top of the camera irrigation (area 1, Fig.2)Lok<cfand in the lower part (area 3, Fig.2)Lok>cfi.e. in the lower part will be a substantial excess of the local values of the coefficient of irrigation in relation to its volumetric average value.

Simultaneously, at the bottom of the camera irrigation will increase the resistance to air flow, resulting in a large portion of the treated air will rush up and will pass through zone 1 (Fig.2) that will enhance the effect of the uneven distribution of the coefficient of irrigation on the height of the living section of the camera irrigation, violation of the hydrodynamic conditions of the interaction of air and water, resulting in incomplete contact environments and, ultimately, reducing the efficiency of the heat and humidity of the treated air.

From this point of view, the device proposed in the prototype, allows you to maintain an optimal hydrodynamic conditions for the interaction of air and water in the 1st and 2nd zones (Fig.2) on high is it in relation to its volumetric average valuecfthat is the cause of hydrodynamic interaction conditions and reduce the efficiency of the heat and humidity of the treated air.

Thus, a disadvantage of the known device in the prototype is the inability optimal hydrodynamic conditions of interaction, ensuring full contact of air and water within the working chamber irrigation, particularly in its lower part (Fig.2, zone 3), which reduces the efficiency of the heat and humidity of the treated air.

The task of the invention is to increase the efficiency of the heat and humidity of the treated air.

The problem is solved in that the device for heat-moisture treatment of air containing the nozzle of the spray chamber with the pallet, the input and output air ducts with plate separators and pipe risers with nozzles, nozzle spray chamber contains parallel-sided nozzle, installed in the lower part of her work space, while the height of the nozzle is 0.3-0,33 height of the working chamber irrigation.

The use of plane-parallel nozzles placed is of major air and water, providing full contact environments due to uniform distribution of water on the surface of the wafer. At the same time it contributes to the reduction of the aerodynamic resistance to the flow of the treated air passes through the lower part of the chamber irrigation. Ultimately achieves the optimal hydrodynamic conditions of contact interaction environments at the bottom of the camera irrigation, which is a new technical property of the claimed device.

In Fig.1 shows a schematic diagram of a device for heat-moisture treatment of air plane of the nozzle; Fig.2 schematically shows the working space of the camera irrigation; Fig.3 presents the results of experimental data processing dependency of the efficiency coefficient from the coefficient of irrigation at the location of the plane-parallel nozzles at different altitudes.

The device includes a housing 1 with the pallet 2, filled with the working fluid inlet 3 and outlet 4 air nozzles placed in them input 5 and output 6 plate separators. Inside the housing 1 posted by tubular struts 7 with nozzles 8. In the lower part of the body is parallel-sided nozzle 9, which has a height of h=0,33 laid in parallel with each other in the package. As the material of the plates was used flat sheets of aluminum with a thickness of 1.0 mm

The device operates as follows.

The processed air through the inlet pipe 3 enters the housing 1, in which by means of nozzles 8 water is sprayed. In case 1, when the contact of the air with water is heat-moisture treatment of the air, where it acquires the required parameters and passing through the output separator 6, exits the device.

Inside the chamber irrigation at the height of the workspace interaction of air and water is as follows. At the top (area 1, Fig.2) and average (area 2, Fig.2) parts of the workspace processed air interacts with the drops of the sprayed water, which under the action of gravity rush down into the surface plane of the nozzle placed at the bottom of the workspace chamber of irrigation (area 3, Fig.2). In the lower part of the working chamber irrigation interact processed air with a liquid film formed on the surface of the nozzle, which ensures uniform distribution of the liquid in the lower part, which reduces the aerodynamic resistance to the passage of vinah data in the form of the dependence of the coefficient of efficiency Eandfrom the coefficient of irrigation at different values of h/H that characterizes the height of the placement plane of the nozzle from the bottom of the living section of the camera irrigation. From the dependences shows that for small values of the coefficient of irrigation (In=0,5-0,55 kg/kg) placement plane of the nozzle in the working space of the camera irrigation has almost no influence on the efficiency of the processes of heat and moisture exchange.

When increasing the ratio of irrigation to 0.7 kg/kg is the growth of Eandof 0.83 to 0.88 to when changing the h/H from 0 to 0,167, while increasing the ratio of irrigation to 1.2 kg/kg Eandincreases to 0,89. With further increase of the coefficient of irrigation is reducing the efficiency ratio, which indicates the violation of the conditions of interaction in the working space of the camera irrigation.

When the magnitude of h/H to 0.33 is the increase of the efficiency, in particular when B=0.7 kg/kg Eand=0.89 and when In=1.2 kg/kg Eand=0,94.

A further increase in h/H to 0.5 does not provide for increasing the efficiency and value of Eanddo not differ from each other in the whole range of changes Century.

It is evident from Fig.3 shows that the use of plasmopara the achieved maximum values of Eand. So, when h/H=0 (no nozzles)=0,65-0,8 kg/kg, with h/H=0,167=0,65-1.1 kg/kg, while for h/H=0.33=0,65-1.4 kg/kg

To assess the effectiveness of processes of heat-moisture treatment of the air in the adiabatic mode of processing was adopted efficiency ratio (Barkalov B. C., Karpis E. E. air Conditioning in industrial, public and residential buildings. - M.: Stroiizdat, 1982. S. 88)

where tc1, tc2, tM1values of air temperature in the dry and wet thermometers, respectively, at the beginning and end of the processing air.

Experimental studies have shown that the proposed device in comparison with the prototype allows to increase the efficiency of the heat and humidity of the air handling an average of 6-10% (Fig.2).

Claims

Device for heat-moisture treatment of air containing the nozzle of the spray chamber with the pallet, the input and output air ducts with plate separators and pipe risers with nozzles, wherein the nozzle spray chamber contains parallel-sided nozzle, installed in the lower part of the workspace, height 0.3-0,33 height of the working space, Breakfast

 

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