Innovations in ventilation - Студенческий научный форум

XII Международная студенческая научная конференция Студенческий научный форум - 2020

Innovations in ventilation

Белов С.М. 1
1Владимирский государственный университет
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In modern design practice, specialists are increasingly faced with situations where the technical solutions offered by the market are significantly ahead of existing standards. For the designer, such a situation can result in difficulties in the coordination of the project. For a manufacturer is a far greater challenge to existing norms even obviously winning and profitable solutions can result in not only loss of market and the stagnation of scientific and technical research, which are the preferential investment field advanced companies.

However, such a challenge can be accepted without being afraid of old rules and putting forward clearly ahead of its development on the market, and change the rules yourself, forcing you to listen to yourself on the basis of the professional reputation of the company. A specific example is the initiative of Flakt Woods, one of the products of which are axial jet fans for Parking Jet Trans Funs.

Jet Trans Fans

The traditional solution for ventilation of underground Parking lots, implemented everywhere in our country – is box-shaped air ducts that provide air exchange and smoke removal, smoke detectors, fire-prevention valves, the existing regulatory practice, supply and exhaust installations with their own air ducts are provided. Until recently, designers in Moscow and at all guided by the regional norms MGSN 5.01 "Parking cars", which prescribed to divide the ventilation system into lower and upper zones.

This solution is extremely inefficient, as it leads to excessive costs of materials, time-consuming and long installation, the rise in price due to the use of many fans. In addition, for modern development, it is also important to reduce the size of the Parking space by height due to the laying of air ducts, which negatively affects the overall effective use of square meters.

Solves these problems a new solution for Parking ventilation systems from Flakt Woods. This company is a well-known professional in the field of air conditioning and ventilation systems. Even the channel tunnel is ventilated by just two fans, and those are both from Flakt Woods. However, the problem of removing polluted air there is not worth it. Throughout its entire length, the 50 – kilometer tunnel is a railway, and cars move along it on special platforms.

In other cases, the issue of removal of exhaust gases sharply rises before any designer who is faced with built-in Parking lots. At the heart of the jet propulsion system-jet fans, which exclude the laying of air ducts and operate in normal mode, and in the mode of ventilation for local smoke removal. Being only a part of the Parking ventilation system, they nevertheless provide the characteristics that are presented by Flakt Woods as its main advantages. This means high performance of the entire system and low cost of installation, low production costs and optimization of Parking space.

The whole complex includes a set of CO2 sensors, and the necessary software and hardware solutions that integrate signals from the sensors and control the operation of each fan individually.

With an integrated solution system based on jet fans can determine the number of cars in the Parking lot (by CO2 sensors) and adjust load and thrust specific fans, reducing system power consumption and increasing the life of mechanisms.

The same actions, but in an emergency, respectively increasing the speed of the fans, the system will take in the event of a fire, localizing the source, freeing the room from smoke and providing access to fire departments to the emergency vehicle.

However, in cases with complex modern technical solutions, the designer, as a rule, is faced with the need for additional calculations. Flakt woods independently performs this calculation part, relying on the latest research and accurate knowledge of the features of their fans.

The demand for cooling beams is increasing due to the increasing demands of users for indoor air quality, temperature, humidity, oxygen content and noise levels from ventilation systems. At the same time, there are increasing demands on the energy consumption of the equipment, on the environmental impact of the systems, on the operating costs and on the flexibility of the system in relation to changing conditions.

For business centers, public buildings and hotels the ventilation solution based on cooling beams is optimal. In such rooms, the number of people in the same room often changes, the air temperature and CO2 concentration rapidly increases and falls rapidly. Accordingly, the operation of the ventilation system in a constant mode to ventilate all rooms would lead to too much energy consumption.

Flakt Woods cooling beams have adjustable nozzles that allow air to be supplied through the beam in the right amount for a specific situation. Flexibly adjustable nozzles can create the necessary air flow in the room, forming different comfort zones depending on the placement of people or equipment in the room. In addition, the electric beam energy management system allows you to control the air flow based on CO2 sensors or presence sensors.

Twin wheel

However, the main problem of cooling beams is condensate. In the case of cooling beams, the design of ventilation systems has to address the problem of additional dehumidification to prevent leakage. The engineers at Flakt Woods has developed a more optimal solution, which is called the Twin Wheel. In its action, the system is similar to a rotary heat exchanger, which provides not only heat transfer, but also humidity. The system includes two rotors and a cooling heat exchanger, as well as the necessary automation and sensors that control the operation of the rotors in accordance with the specified dew point values.

In the primary circuit of such a vent installation, the absorption rotor of complete disposal reduces the temperature of the outside air and ensures the transfer of moisture from the incoming air to the removed one. After passing through the primary rotor, the air temperature decreases in the cooling heat exchanger, where moisture condensation occurs. Finally, the dried and cooled air enters the ordinary rotor, where the heat of the removed air is utilized and the supply air is heated.

Due to the use of the system, the supply air humidity does not exceed the permissible levels and the risk of condensation is eliminated. With the use of the Twin Weel system, the cooling heat exchanger power can be reduced by 25%, which, of course, affects the overall energy consumption of the entire plant.


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