RU2349841C1 - Air conditioning system with combined indirect cooling - Google Patents

Abstract

FIELD: conditioning.

SUBSTANCE: system comprises a mechanical-draft cooling tower mounted on the roof of the building being conditioned, a drip tray for cooled water collection is set in the lower part of the mechanical-draft cooling tower body with inducing fresh air intake holes being made in the body under the tray, the upper part of the mechanical-draft cooling tower body is fitted by a spraying device with nozzles and an axial fan. The air conditioner comprises a centrifugal fan for supplying air into the room, an oil self-cleaning filter, a heat exchanging unit, an air washer connected to a centrifugal pump by a pipeline and intake and exhaust shafts with a common separating wall, supply of fresh air and recirculation air from the room through the filter is controlled by an automatic valve.

EFFECT: increasing efficiency and reliability of automatic control over two-fan air conditioners.

2 cl, 1 dwg

Description

The invention relates to techniques for air conditioning and ventilation and can be used to create comfortable conditions and microclimate in industrial premises with excessive heat.

The closest technical solution to the claimed object is air conditioning according to the patent of the Russian Federation No. 2067730, class. F24F 3/06 of 10/10/96, comprising a housing, receiving valve and heating sections, an irrigation chamber in which nozzles and drip traps with a filter pan are installed, a filter section connected to the ventilation unit.

Its disadvantage is the relatively low efficiency of the automatic control process.

The technical result is an increase in the efficiency and reliability of the process of automatic regulation of dual-fan air conditioners.

This is achieved by the fact that in an air conditioning system with combined indirect cooling, which includes a fan tower installed on the roof of an air-conditioned room, a tray for collecting chilled water is installed in the lower part of the fan tower case, and in the case there are ejection openings for the influx of external air, and in the upper part of the cooling tower housing there is an irrigation device with nozzles and an axial fan, and the air conditioner contains a centrifugal valve a nano air supplying device to the room, an oil self-cleaning filter, a heat exchanger, an irrigation chamber connected by a pipeline to a centrifugal pump, as well as supply and exhaust shafts having a common wall separating them, while the automatic valve controls the flow of outdoor and recirculated air through the filter from the room .

The drawing shows an air conditioning system with combined indirect cooling.

The air conditioning system with combined indirect cooling includes a fan tower 2 installed on the roof of the air-conditioned room 1. In the lower part of the fan tower body 2 there is a tray 3 for collecting chilled water, and in the case above the tray 3 there are ejection openings for the influx of outdoor air with temperature t ₁ . In the upper part of the tower tower 2 there is an irrigation device 4 with nozzles and an axial fan 5. The air conditioner 8 contains a centrifugal fan 6, which supplies air to the room 1, an oil self-cleaning filter 11, a heat exchanger 10 (surface air cooler in the warm period and surface air heater in the cold period ), an irrigation chamber 9, connected by a pipe 21 to a centrifugal pump 17.

The air conditioning system is designed in such a way that the supply 12 and exhaust 13 of the shaft have a common wall 14 separating them, which makes it possible to use heat removed from the room 1 in the cold season and reduce the load on the heat exchanger 10 for heating the outdoor air. In addition, the supply shaft can be placed inside the exhaust to save energy resources of the entire enterprise where the air conditioners are installed (not shown in the drawing). The automatic valve 15 regulates the supply of external and recirculated air from the room 1, coming in through the duct 19, in which the axial fan 7 is installed, through the filter 18. The centrifugal pump 16 delivers water through the piping system 20: cooled - from the cooling tower 2 to the heat exchanger 10, and heated - from the heat exchanger 10 to the irrigation device 4 with the nozzles of the cooling tower 2.

The air conditioning system with combined indirect cooling operates as follows.

Two-stage evaporative air cooling is performed in a heat exchanger 10 (I stage) and in a nozzle or nozzle chamber of irrigation 9 (II stage). In stage I, the air is cooled in surface heat exchangers fed with water, which in turn is cooled in tower 2 when water is evaporated into the air. The air conditioning system with two-stage evaporative cooling can be classified by air passage as a system with two-stage air treatment processes with a water-air recuperative heat exchanger 10, in which the cooling tower 2 and the air conditioner 8 work in the outdoor air, which passes through the surface air cooler and is cooled in it, then the air is circulated water sprayed in nozzles 4 and adiabatically moistened and cooled. Passing through the supply fan 6 and the air ducts, the air is heated to 0.5-1 ° C and discharged into the room with parameters corresponding to the supply air point, and after the assimilation of heat and moisture in the room, the air takes the parameters of the point corresponding to the standard parameters of the room air. Water is cooled for the heat exchanger 10 by evaporating it in a cooling tower 2 (or in an irrigation chamber 9) through which external air passes, while the air is humidified, its temperature decreases, and the enthalpy rises due to the heat of the cooled water. If the enthalpy of the air in the room is significantly lower than the enthalpy of the outside air, then it is advisable to direct internal air to the cooling tower 2 instead of the outside. To reduce the vibro-acoustic activity of the apparatus and its metal consumption, as well as to increase its reliability, the proposed device provides the following measures: a layer of soft vibration-damping material, for example, VD-17 mastic, is applied to the surface of air conditioning components, cooling towers and air ducts, and the ratio between the thickness of the metal and the vibration-damping coating is in the optimal range of values: 1 / (2.5 ... 4).

Claims (2)

1. An air conditioning system with combined indirect cooling, including a fan tower installed on the roof of an air-conditioned room, characterized in that a tray for collecting chilled water is installed in the lower part of the fan tower case, and in the case there are ejection openings for the influx of external air, and in the upper part of the cooling tower housing there is an irrigation device with nozzles and an axial fan, and the air conditioner contains a centrifugal fan OR supplying air to the room, an oil self-cleaning filter, a heat exchanger, an irrigation chamber connected by a pipeline to a centrifugal pump, as well as supply and exhaust shafts having a common wall separating them, while the automatic valve controls the flow of external and recirculated air through the filter from the room flowing through the duct in which the axial fan is installed. 2. The air conditioning system with combined indirect cooling according to claim 1, characterized in that a layer of soft vibration-damping material, for example, VD-17 mastic, is applied to the surface of air conditioning components, cooling towers and ducts, and the ratio between the thickness of the metal and the vibration-damping coating is in the optimal range quantities 1 / (2.5 ... 4).