FI71834B - Air treatment plant - Google Patents

Description

II ^ NKÄSITTELYLAITE

71834 The present invention relates to an air handling unit for introducing pretreated (cooled, ventilated) air into a room. The air handling unit according to the invention is primarily intended for blowing cold ventilation air into rooms where there is a constant need for cooling. Question 5 may be, for example, office rooms or halls with a year-round cooling requirement due to internal heat load supports.

The air handling unit according to the invention is furthermore suitable for all ventilation systems on the market, in which the supply air is blown down the duct into the room and a member constructed for that purpose is used as the terminal member.

There are already several patented input means and spreaders for the above-mentioned purposes. For example, Announcement publications FI53250, FI63630 as well as FI63829 present some ways to solve the cooling air supply. The weakness of the presentations of all these publications is that the temperature difference between the inlets and the room air is limited to 10-12 ° C, especially when it comes to normal-height office or similar room spaces.

Cold ventilation air is heavy and thus has a high tendency, when blown out of the ceiling or inside an air inlet> 0, to descend rapidly towards the floor of the room and cause harmful draft before it mixes with the room air.

With cooling capacity depending only on the supply air volume and the temperature difference used, the solutions available on the market, with a maximum temperature difference of 10-12 * C, are the only way to increase the supply air volume to the cooling capacity 25 from the minimum requirement of the authorities.

As a result of the large supply air volumes, the problem is to get the air into a draft-free space, as well as the massive ventilation system central equipment and duct systems. The regulations (Finnish Building Code, Part D2) and the authorities allow air variations in the rooms that are considerably less than 10 cooling air volumes.

2 71834

The air treatment device according to the invention provides a decisive improvement in the above-mentioned disadvantages of ventilation systems. To achieve this, the device according to the invention is characterized by what is stated in the characterizing part of claim 1.

The most important advantage of the invention is that the ventilation systems can be dimensioned for the minimum ventilation of the authorities and still be able to control the cooling and heating needs by means of ventilation.

Another important advantage of the invention is that when an electric motor is used as the actuator and a thyristor or the like is used to control it, the supply air blower continuously adjusts the air discharge length to the room to suit fresh air completely regardless of the amount of air currently known.

In the following, the invention will be explained in detail with reference to the accompanying figures 15.

Figure 1 shows a schematic plan view of a device according to the invention.

Figure 2 shows the device according to the invention in a schematic sectional view taken along line I-I of Figure 1.

20 In the figures, the same or similar parts and things are denoted by the same reference numerals.

The air handling unit mainly consists of three main parts, the unit body (Fig. 1 and 2 part 1), the impeller (Fig. 2 part 2) and the actuator rotating the impeller (Fig. 2 part 3). The part (8) of the connector 25 connects the air handling unit to the supply air duct.

The air handling unit operates as follows: the actuator (3) rotates the suction impeller (2) on both sides of the supply air duct (6) and the room (4), whereby the impeller sucks fresh air from the supply air duct and recirculated air from the room (4) and blows air mixture (5) into the room. The amount of recirculated air (4) is many times higher than the amount of fresh air (6) 3 71 834, whereby the temperature difference between fresh air (6) and room air (4) can be several tens of degrees Celsius. In the impeller (2), fresh air (6) (low temperature air) and recirculated air (4) are mixed as a result of turbulence and the temperature of the air mixture (5) is set at a level (low temperature 10-12 eC) that the air mixture can be blown into the room without draft.

It should be noted that the air mixture (5) leaving the air handling unit is blown horizontally along the roof surface and given additional kinetic energy in the fan wheel so that the air mixture does not fall into the residence zone 10 but mixes with the ambient air. The air treatment device can blow the air mixture in direction 1, 2, 3 or 4, or even radially.

In particular, it should be noted that the device according to the invention can be mounted both on the ceiling and on the wall by equipping the device with air guides (7) which take into account its installation conditions. Otherwise, it should be noted that the invention has been presented above with reference to only one preferred embodiment thereof. This is in no way intended to limit the invention to an example only, but many modifications are possible within the scope of the inventive idea defined by the following claims.

Claims (4)

An air handling unit for introducing preferably pre-treated (cooled, heated) air into a room where draft is required in the living area, characterized in that a suction impeller (2) is attached to the shaft of one and the same actuator (3) on both sides to extract fresh air from the supply air duct and recirculated air in a fan wheel, to blow the mixture radially from the device through the blow slots into the room. Air handling unit according to Claim 1, characterized in that, provided with an electric actuator (3) and a speed control, the throw length of the air mixture (5) can be infinitely adjusted by adjusting the speed of the impeller (2). Air treatment device according to Claim 1, characterized in that the impeller (2) sucks two airs under different conditions by mixing them together before blowing the air mixture from the impeller. Air treatment device according to Claim 1, characterized in that the impeller (2) consists of two impellers connected to the word shaft and rotating in the same direction, which suck air from different access points (6 and 4) and blow the air mixture into one and the same space (5).