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Engineering Systems

August 12, 2017 18:08

Calculation of room ventilation - how to correctly adjust ventilation ?

Calculation of room ventilation - What is the main problem?

system of city apartments and country houses ventilation is substantially similar.The only difference is that the requirements for sound insulation in suburban homes is slightly higher because the noise generated by the ventilation system, clearly audible in the background of the rural peace and tranquility.

calculation of any ventilation system should start with the evaluation of its performance.Before you calculate the airflow, you must learn the building area and its purpose, as well as the number of people staying in it for a long time.

for normal residential ventilation rate is equal to one, and for the workers, this value should be at least twice as high.This value indicates the number of complete change of air in the room for an hour.

How to calculate the air exchange - present the basic formula

to room ventilation requirements stipulate that in the living room, where there is no natural ventilation, the air flow rate per person must be at least 60 m³ / h.In the calculation should take into account only those who are in the room for a long time.

To calculate the required flow, you need to calculate the performance of air by the multiplicity and the number of people.Expect ventilation for the number of people needed for the formula L = NxLnorm , where

  • L - the required performance of the ventilation system;
  • N - number of persons;
  • Lnorm - air consumption per person (60 m³ / h).

Air exchange rate is calculated using the formula L = SxHxn , where

  • L - the required performance of the ventilation system;
  • S - area of ​​the ventilated premises;
  • H - height of the ventilated premises;
  • n - number of air under the rules (for residential 1-2, 2-3 for the working rooms)

Performing the necessary calculations and selecting the larger of these values, you can get the value of the desired air space.Adding the value of the required ventilation of all rooms, you can get the overall performance of the ventilation system of a particular building.

requirements for ventilation of premises and especially "clean" rooms

Table air standardizes data values ​​for certain types of buildings:

  • for premises: 100-500 m³ / h
  • for country houses: 500-2000m³ / h
  • for working premises: 1,000-10,000 m³ / h

Once defined the overall performance of the building ventilation system, you can start designing the air distribution system that consists of air ducts, throttle valves, valves.Driving duct is made so that the net flow was applied only in those areas where there are people a long time.

Then he falls into the corridor and from there into the kitchen and bathrooms, which is removed through the ventilation system.Such a system does not spread contaminated air masses and unpleasant smell throughout the room.

Ventilation cleanroom distributes air in a special system.Clean and cooled air masses are fed through a distributor system, which are located above the working area, and removed with a floor exhaust vents.

Thus, the polluted air is pressed against the surface of the floor mass heavier arriving air flow and removed through the hood system.The rooms in which the atmosphere must be maintained in a certain number of particles (dust, particulate matter, microorganisms) are called pure.