Cooling method air flow

 

The invention relates to a method for cooling air flow and can be used in ventilation and air-conditioning. The inventive method of cooling air flow can be implemented by passing the stream through surface heat exchanger (cooler) with circulating water, obtained by evaporative cooling, the temperature of which is reduced due to the use of water in the previous cycles of direct and indirect cooling. The proposed method of cooling air reduces its temperature almost to ~ dew point. 4 Il.

The invention relates to a method for cooling air flow and can be used in ventilation and air-conditioning.

Currently, ventilation and air-conditioning are widely used methods of direct evaporative cooling (moisture) air contact apparatus: irrigation spray chambers, cooling towers, spray ponds [1]. In them the air is in direct contact with water, which rasplivaetsa in the air stream. As a result of evaporation of water (dtsa. Thus the enthalpy of air remains constant. Therefore, the cooling method is also called isoenthalpic or adiabatic cooling (wet) air.

Also practice using the method of indirect cooling [2], i.e. using a surface heat exchanger when the heat from the air the water is drawn through the wall (surface).

Usually use heat exchangers with external fins. The air flow moves from the outside finned surface, the cooling medium (water) inside the tubes. Humidification is not happening.

The disadvantages of these methods of cooling air is relatively small reduction in air temperature (direct process) or the necessity to use refrigeration unit with indirect cooling to obtain cold water or other cooling medium. In the latter case significantly increase energy costs and the cost of equipment.

Closest to the claimed method of cooling air flow is two-way (direct and indirect) evaporative cooling [2].

Under the two-stage cooling means consistent treatment of air by courteny air passes through two stages of processing, which allows to obtain the final temperature of the treated air is a few degrees below the temperature of the wet thermometer.

Schematic diagram of two-stage air processing shown in Fig.1, a change of air during this processing is shown in Fig.2.

The schema contains

surface heat exchanger (cooler), 1,

the contact device (irrigation nozzle chamber) 2,

the contact device (cooling tower) 3,

the pumps 4, 5 and

the fan 6.

Outside air in the warm season comes in the surface of the cooler 1, i.e. in the first stage of cooling. Here the air is cooled at constant moisture content, the segment HH1(Fig.2). For cooling water supplied to the surface of the cooler 1 may be applied to the cooling tower 3. The outlet water temperature decreases nearly to the temperature of the wet thermometer through the process of direct evaporative cooling. With the help of the pump 4 water is directed into the evaporator 1 and then again at the tower 3.

Then the air flows into the irrigation nozzle chamber 2 (the second stage of processing), where the direct evaporative pre-cooling refrigerated air, p is the rise in moisture content, segment H1On (Fig.2). Then the cooled and humidified air is usually a fan 6 served served in the room.

Two-stage (direct and indirect) evaporative cooling reduces the air temperature, obtained after processing and, consequently, to reduce the required air in the conditioned space compared to a single-stage direct evaporative cooling.

The disadvantage of this method of two-stage cooling can be attributed to moderate, shallow cooling air (as already mentioned above, the temperature at the exit is just a few degrees below the temperature of the wet bulb temperature of the outdoor air). Another disadvantage of this method is the dependence of the final temperature of the air exiting from the relative humidity. The air temperature at the outlet is determined by the position so isoenthalpic jh1. With decreasing relative humidity (thus shifted to the so H1on line jh1- const, Fig. 2) its temperature will not be significantly reduced.

To resolve ukazannye disadvantages enables the claimed invention.

The technical result of the invention is the lowering of temperature Vozduha simultaneous cooling and humidification in wide ranges, from the initial values of temperature and relative humidity to dew point temperature and condition of full saturation.

The technical result is achieved in that a method of cooling an air stream in which the stream is passed through a surface heat exchanger (cooler) with circulating water which is formed by evaporative cooling, the temperature of which is reduced through the use of this water in the previous cycles of direct and indirect cooling.

Scheme of the proposed method of cooling is shown in Fig.3. Change the settings of the air when this processing is shown in Fig.4.

The schema contains

1, 2, 3 - surface heat exchangers (coolers),

4, 5, 6-pin devices (cooling tower) and

the pumps.

The essence of the proposed method of cooling air flow consists of the following stages (steps).

I Stage. Outside air pass through the surface of the cooler 1, the contact device 5 (the tower) and released into the atmosphere. For cooling water flowing into the evaporator 1, is the tower 4. In the heat and humidity treatment outside air is moistened and ohlazhdaetsya in the tower 5, in turn, it will be a few degrees lower than the temperature of the air removed from the tower 5, i.e., the temperature of the water leaving the tower 5, below the temperature of the wet thermometer outdoor air.

Thus, stage I air handling its equipment and technological cycle corresponds to two-stage (direct and indirect evaporative cooling of air described above. However, the purpose of stage I is not getting cooled air to the chilled water, which will serve as the circulation water cooler at stage II air handling.

II stage. Outside air, as in the first stage sequentially undergoes the surface of the cooler 2, the contact device 6 and is discharged into the atmosphere. However, the cooler is cooled by circulating water, the temperature of which is lower than the water used at stage I in the cooler 1. Therefore, at the second stage, the air is cooled to a temperature lower by several degrees than after the first stage.

Stage III. This stage and all subsequent stages, if they have a need that can fit on the equipment and the scheme of the process is ladenia) the last stage will consist of one surface of the cooler, for example, the heat exchanger 3.

Thus, the cooling air includes a multi-stage process, where the direct and indirect cooling air to get the water temperature which can be reduced by up to ~ dew point temperature of air. Therefore, the proposed method of cooling air can be considered as a way of moderate cooling water.

The advantages of the claimed invention are as follows:

1. The possibility of lowering the air temperature in the limit ~ to the dew point temperature of air at constant initial moisture content.

2. Simultaneous cooling and humidification in a wide range, from the initial values of temperature and relative humidity to ~ the dew point temperature and ~ full saturation is achieved.

Sources of information

1. A. A. Peglow, T. A. Stepanov. The air conditioning. - Kiev: high school, 1978, 327 S.

2. B. N. Theological, O. I. Kokorin, L. C. Petrov. Air conditioning and refrigeration. - M.: stroiizdat, 1985, s.

Claims

The method of cooling an air stream in which the stream is passed through a surface heat exchanger (cooler) with circulating Vera which is reduced due to the use of water in the previous cycles of direct and indirect cooling.



 

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