Air quality is one of the most important indicators of the environment surrounding a person. Any public place should be equipped with a ventilation system that will ensure the removal of contaminated air from the room and replace it with an outdoor clean one.
High requirements for ventilation of public buildings are dictated not only by sanitary and hygienic standards, but also by concern for the comfort of visitors. Indeed, you must admit that it is not very pleasant to be in a room where a lot of smells are floating in the air, and not always pleasant ones.
Next, we will tell you what regulatory acts regulate the climatic conditions in rooms and how ventilation can be arranged in rooms for various purposes.
The microclimate in the premises of various types
The ventilation system diagram is developed during the design of the building. Engineers and designers take into account the specifics of the structure, architectural features, the difference in the climatic conditions in the premises.
Before serving, the air must be heated during the cold season. For this, duct heaters are used in the supply ventilation systems.
Regulatory documents that establish the boundaries of the microclimate limit values come to the aid of specialists:
- SP 7.13130.2013;
- SP 60.13330.2016;
- SP 252.1325800.2016.
Before starting work on designing an air conditioning and ventilation system for public buildings, it is necessary to determine which category the building belongs to.
According to GOST 30494-2011, the following categories are distinguished:
- 1 category. It includes all the rooms in which people are in a state of rest and peace, lying or sitting.
- 2 category. The building is intended for mental work or study.
- 3a. The premises are characterized by a massive stay of people without warm outerwear, mainly sitting.
- 3b. Indoor people are in street clothes, usually sitting.
- 3c. Indoors are people in street clothes, standing.
- 4th category. Places of doing sports.
- 5th category. Premises of this type assume the presence of people in a half-dressed form (swimming pools, gyms).
- 6 categories. The category includes rooms where people stay for a short time (pantries, bathrooms, lobbies, corridors).
The engineers face a rather difficult task of ensuring optimal parameters in each room.
The installation of a supply fan on the roof is an example of rational use of the area of a public building, which saves space in the room
According to the norms, 20-30 m should constantly enter the room3 fresh air per person. Now there is controversy surrounding this meaning. With such an inflow, a draft can occur, which is very unpleasant in the cold season, when the heating elements of the ventilation simply do not have time to warm the air flow to a comfortable temperature.
Another method of calculating the necessary air exchange is based on the formula:
V = 3 m3 * S,
where S is the area of the room.
Accordingly, there are 3 cubic meters of air per square meter. This method is used, as a rule, to calculate the necessary inflow in a residential building, but SNiP 31-05-2003 allow such a calculation for offices in an administrative public building.
In calculations for some rooms, such as a toilet, a smoking room, a kitchen, the air exchange rate is used as a quantity that determines the parameters of the ventilation system.
This is a value that describes how many times the entire volume of air in the room will be replaced within one hour.For the kitchen, the minimum allowable value is 3 rpm, for the toilet - 5 rpm, for the smoking room - 7 rpm. Such a calculation is only suitable for small rooms in which people are briefly.
For small branches of general ventilation, it is more rational to use round duct fans, they can be installed in any position
Ventilation system options
The implementation of high-quality ventilation and air conditioning systems in public spaces is the key to comfort and well-being of people. There are several basic technical solutions for these engineering systems.
General exchange type ventilation
The exhaust part of the ventilation system is needed to eliminate contaminated air, excess moisture and heat from the room.
Its correct operation depends on a constant flow of air. For this, forced ventilation is needed, supplying fresh air from outside the room.
Within one floor, air ducts are routed along the ceiling, later, when the system is fully assembled, they can be hidden behind a suspended ceiling
Stacked exhaust ventilation consists of: an external grill, a fan, an automation unit, air ducts, exhaust umbrellas (kitchens, laboratories), an internal grill or exhaust diffusers.
For ventilation, the following components are needed: an external grille, a filter, an air heater, a silencer, humidity, temperature, freezing sensors, a fan, air ducts, internal wall or ceiling grilles, and supply diffusers.
This type of ventilation is most often used in public buildings. In the structure, several branches of general ventilation are mounted, not communicating with each other.
Plus type-setting ventilation - a separate air purification in different rooms, the ability to adjust the power of the air flow in each office. But such an engineering solution has several disadvantages. The main one is bulkiness. In buildings where it is not possible to hide air ducts behind a suspended ceiling, problems arise with the aesthetics of this design.
In the case when the ventilation is interfloor, vertical ducts are mounted by way of building from above or building from below.
In cases where the installation of a false ceiling is not possible, do not hide the ducts behind it. The ventilation system is laid in an open way, the air ducts are decorated in accordance with the interior of the establishment
Some bars and restaurants use ductwork as part of the decor. In this case, stainless air ducts are usually used. In general, neatly mounted ventilation fits into the interior of the institution.
To suppress noise, air ducts are covered with insulating material, which effectively prevents the propagation of sounds between individual rooms and practically reduces to zero air noise in the air ducts themselves.
Such a ventilation system is suitable for buildings with a large number of separate cabinets.
Supply and exhaust ventilation with recovery
This ventilation system differs from the previous version by the presence of a recuperator - a surface-type heat exchanger. It is installed at the intersection of the supply and exhaust ventilation branches.
The air removed from the room leaves heat on the heat exchanger plates. The air that enters the supply system is heated from its ceramic plates.
The recuperator in the ventilation system heats fresh air to a comfortable temperature. This energy-efficient device allows you to save about 20-30% of heat
Check valves in the body of the recuperator prevent the discharge of air between the ventilation branches.
Recovery allows you to save significantly on heating. Especially tangible is the advantage of the recuperator in a large room: a conference room, a cinema, an assembly hall.
Forced-air and exhaust installations
Using a ventilation unit scares away many building owners because of the high price of the unit itself. It is an all-in-one device - the main elements are placed in the case.
Some models are equipped with an air cooler. Unfortunately, it is difficult to use it for conditioning a large number of cabinets for various purposes. This is due to the inability to establish an individual temperature regime for each individual room.
The use of ventilation units eliminates the noise and unnecessary trouble with the arrangement of ventilation and guarantees a minimum of trouble with the maintenance of the ventilation system
Supply and exhaust systems are the easiest way to organize a ventilation system. A fairly compact device does not take up much space in the ventilation chamber.
Due to the fact that the fans are located inside a well-insulated enclosure, the noise level from the supply and exhaust system is lower. Maintenance of installations is much cheaper than typesetting systems. Their disadvantage is the need to install additional ventilation equipment in bathrooms, smoking rooms, server rooms.
Smoke and fire ventilation
All ventilation equipment must be installed in accordance with the fire regulations of SP 7.13130.2013. It is impossible to neglect these simple rules during the development of the circuit and installation. Any building, and even more so a public one, must necessarily be equipped with fire and smoke protection of adequate quality.
The spread of fire and smoke through the duct system is a big problem in a fire. To combat it, fire dampers with a temperature sensor are mounted in the ducts.
Under normal conditions, it is constantly open. When the temperature rises to extreme, the sensor is triggered, which actuates the valve actuator. After closing, the sealant applied to the edge of the valve expands, as closely as possible adhering to the duct.
The smoke in the rooms prevents the evacuation and complicates the work of firefighters. It is impossible to completely get rid of the smoke, but you can minimize its harm by installing fans for back-up and smoke removal.
Smoke exhaust fans are needed to remove smoke from the room. Modern models are able to work at a temperature of 400-600 ° C for about 2 hours
Smoke exhaust fans are needed to provide clean air for people on the escape route. Forcing air in crowded places (evacuation corridors, stairwells), it increases pressure, preventing smoke from entering there.
You can learn about how ventilation systems are installed from the following video:
It is impossible to ignore fire safety rules or SanPiN, despite the high cost or inconvenience of their implementation. The number of technical solutions for the ventilation of public buildings is quite considerable.
For each project, you need to select and search for the way to implement the ventilation system that will be suitable for the stated requirements. But, if there is not enough experience in this area, it is better to contact specialists who will help to properly design and equip the ventilation system.
Please ask your questions on the topic of the article, share your experience and valuable tips on arranging ventilation. The communication unit is located below.