PM2.5 (XH) fresh air ventilator

PM2.5（XH）Fresh air ventilators are divided into ceiling mounted, vertical, and horizontal installation methods. Our company can also design and produce non-standard products according to user needs to maximize customer and market demand. The products produced by our companyPM2.5(XH)The fresh air ventilator adopts a plate fin heat exchanger, which is a type of static heat exchanger that directly exchanges air with air. It does not require heat exchange through an intermediate medium and does not have a rotating system. Therefore, a static plate fin heat exchanger (also known as a fixed heat exchanger) is an ideal energy recovery device. Static plate fin heat exchanger is used for sensible or total heat recovery when there is a temperature difference and water vapor partial pressure difference between the two airflows on both sides of its baffle.

In a plate fin heat exchanger, two airflows flow through the heat exchanger in a cross shape. The partition of sensible heat exchanger is made of non permeable material with good thermal conductivity, usually aluminum material. A total heat exchanger is a type of permeable air air heat exchanger, in which the partition is made of treated materials with good heat and moisture transfer properties. The exchange mechanism of temperature (sensible heat) is that when air of different temperatures flows through both sides of the medium, heat is exchanged through conduction. The exchange of humidity (latent heat) in a total heat exchanger occurs through the following two mechanisms:

① Moisture exchange is carried out through the differential pressure of water vapor on both sides of the medium.

② The water vapor on the high humidity side is absorbed by the moisture absorbent,Release to the low humidity side through the capillary action of paper fibers.

Plate fin heat recovery device:

AStatic heat exchanger In order to facilitate the arrangement of airflow channels inside the machine and reduce the overall volume, small and medium-sized fresh air ventilators adopt a flat cross static heat exchanger. Its working principle is that the movement directions of cold and hot air are perpendicular to each other, and the airflow inside the heat exchanger belongs to the convective heat transfer property in the turbulent boundary layer, with high heat exchange efficiency.

BSensible heat exchanger and total heat exchanger, sensible heat exchanger is made of aluminum foil material, with high temperature conductivity and long service life, suitable for areas with large indoor and outdoor temperature and small humidity differences. The total heat exchanger is made of paper made from specialized fibers using a special process. This material has the characteristics of high moisture permeability, good air tightness, tear resistance, and aging resistance. A total heat exchanger is suitable for areas with small temperature and large humidity differences indoors and outdoors.

PM2.5(XH)Conversion of parameters for fresh air ventilator

Area of a certain computer roomS=65㎡, net height=3Mi, personneln=25If calculated based on the required fresh air volume per person, take the required fresh air volume per personq=30m³/h, then the total fresh air volumeQ1=n×q=25×30=750m³/hIf calculated based on the number of fresh air changes in the room, take the number of fresh air changes in the roomp=4order/h, then the new air volumeQ2=p.s.h=4×65×3=780m³/hDue toQ2＞Q1Therefore, takeQ2As the basis for equipment selection; Based on the product model, our company'sXH-80DFull heat exchange products.

Note: Calculation formula for room volume: Volume=Length x width x height below the air supply outlet

Number of fresh air ventilators to be selected=Room volume x required number of air changes/Rated fresh air volume of a single fresh air ventilator

Design Considerations

1To ensure smooth convection in the environment, the system exhausts air volume=Fresh air volume.

2The volume size of the building space: the breathing activity zone of the occupants in the living room is2.4mVertical height; The respiratory activity of people in commercial buildings4.5mThe ratio of the vertical height of the breathing belt to the volume of the entire space is approximately0.26~0.47.

3The fresh air volume of residential and office buildings shall not be less than30m³/h.pTaking into account both the number of air changes and the minimum fresh air volume, calculate the maximum fresh air volume based on both factors as the selection criteria.

4Sports venues, conference halls, cinemas, etc. can determine the selection of fresh air volume based on the occupancy rate and air exchange rate, and accommodate people during their stay3For hours or less, press50%The occupancy rate determines the new air volume.

5For large shopping malls and other central air conditioning system shared spaces, according to the air supply volume of the central air conditioning system30%Determine the fresh air volume for selection.

Design requirements for air ducts

1To achieve the lowest wind resistance and noise in the designed air duct, mufflers or canvas soft connections should be used between the fresh air outlet and the main unit, and between the exhaust outlet and the main unit.

2For suspended ceiling machines, spring dampers or rubber dampers must be installed on the suspension rods.

3When concealed indoor lifting, maintenance and inspection ports must be reserved.

4The host and main air duct should be maintained3-5At the corner of the wall, keep the host position slightly higher.

5Metal air ducts must be insulated.

6、PVCPipes, rubber corrugated pipes, aluminum foil asbestos pipes, and aluminum foil composite pipes have their own insulation properties and can be directly installed and used.

7Installation of air valve: An air volume regulating valve must be installed at the junction of the main air duct and the branch air duct at the proximal and distal ends. Air flow deflectors or air volume regulating valves can be used in the middle of the pipeline system.

8The air ducts should be connected with flanges, and rubber sealing strips should be added to the connecting flanges.

9Choose the position for opening the air outlet: The opening of the air outlet should be uniform in principle to ensure a balance between the fresh air volume and exhaust air volume in various parts of the room.

10The air outlet should not be opened at the following positions: the turning point of the air duct, the tail of the air duct, or the changing diameter of the air duct.

Additional explanation: With the continuous improvement of our company's technical level, we reserve the right to make changes to product parameters without prior notice.