Design of the system of air ventilation for the conference hall
we completed the object of the Conference Hall in the institution. We performed a full cycle of works on ventilation, starting from the development of drawings (HVAC ventilation project), the implementation of construction and installation works (installation) of HVAC, further commissioning, tests, preparation of the as-built, and commissioning.
VENTILATION DESIGN
This working draft addresses the issues of ventilation and air conditioning, providing for the meteorological conditions required by the standards (temperature and air velocity) in the working or serviced area, selection of the main ventilation equipment and materials, as well as determining the need for heat, cold and electricity.
The working draft was made on the basis of:
- technical specifications of the customer;
- architectural and construction tasks;
- tasks of the technological department for the design of ventilation and air conditioning;
When developing a working draft, the requirements of regulatory and guidance documents were taken into account, including:
- SNiP 41-01-2003 - Heating, ventilation and air conditioning;
- SNiP 23-01.99 * - Building climatology;
- SNiP 21-01-97 * - Fire safety of buildings and structures;
- SNiP 2.09.04-87 * - Administrative and residential buildings
- SNiP 2.08.02-89 * - Public buildings and facilities.
- Allowance to SNiP 2.08.02-89 "Design of catering"
- SNiP 3.05.01-85 - Internal sanitary and technical systems;
-SNiP 23-02-2003 Protection against noise.
Climatological data
Design parameters of outdoor air:
For ventilation systems:
The cold period (parameters B): tn = -28ºС, I = -27.7 kJ / kg,
The warm period (parameters B): tn = 28.5ºС, I = 54 kJ / kg,
Barometric pressure 995 hPa
1.3 Sources of heat and cold supply:
The heat carrier for ventilation needs comes from an individual heat point located outside the limits of the reconstructed part of the building. The heat carrier of the heat supply system of the inlet installations is water with parameters 95-70 ºС.
The source of cold is a new cold center, installed on the street. Water with parameters of 7-12 ºС is used as a coolant.
General design solutions
This working draft was made in connection with the reconstruction of the object. This project considers solutions related to the placement of equipment for supply and exhaust ventilation in a landing stage. This equipment provides ventilation of the basement of the basement, the dining room, the hot shop, the technological room of the dining room. For this purpose, general exchange ventilation with mechanical impulses is provided. From the process equipment provided local suction. The equipment of the supply and exhaust systems is partially located in the existing ventilation chamber N17, partly on the roof of the building and, accordingly, in the new, attached ventilation chamber. Provides for cleaning the supply air in pocket filters, heated in the cold season and cooling in the warm.
For each unit, a unit for controlling the air heater with a 3-way control valve and a circulation pump is provided in the supply chamber. Heat carrier - water with parameters 95-70 ºС. For each air supply unit, an air cooler control unit with a 3-way control valve is provided. Coolant - water with parameters of 7-12 ºС. Pipelines for heat supply and cold supply are made of steel water and gas pipes, which are covered by thermal insulation of pipe “K-flex” with a thickness of 13 mm
PROJECT DOCUMENTATION OF THE GENERAL VENTILATION SYSTEM
Measures to reduce noise and vibration.
Permissible sound pressure levels created in rooms with ventilation systems, adopted in accordance with SNiP 23-02-2003 "Protection against noise."
To reduce noise and vibration from the ventilation systems to values not exceeding the permissible sound pressure levels, the following measures are taken:
- restriction of air velocity in air ducts and ventilation grilles;
- installation of lamellar silencers in inlet chambers and exhaust ventilation chambers;
- installation of plate and tubular silencers on the air ducts;
- the presence of a noise-absorbing casing in the structure of the supply units;
- sound insulation of the outer casing of the muffler and air ducts after the muffler, located within the ventilation chamber;
- the device of flexible inserts between the fan (ventilation chamber) and the air duct attached to it;
- installation of low noise duct fans in exhaust systems;
- plastering walls lining with noise-absorbing coating.
2.5 Measures to ensure fire and explosion.
2.5 Measures to ensure fire and explosion safety and smoke removal.
The project envisages fire prevention measures in accordance with the requirements of SNiP 41-01-2003.
Gaps in the passage of pipelines and ducts through the walls and floors of the building are filled with fireproof materials. Transit air ducts after crossing the ceiling or fire barriers are performed with a fire-retardant coating with a fire resistance of 0.5 hour.
On the air ducts serving the premises of category “B”, installation of normally open fire-retardant valves is provided. The valves are equipped with automatic and remote controlled actuators.
In case of fire, all ventilation systems are switched off and the remote control system is automatically switched on.
All ventilation equipment is grounded.
2.6 Automation, locking, control
To ensure and maintain the required parameters of the air environment in the premises, to increase the reliability of the systems, to save heat and electricity, the project provides for the following measures:
- Local control of indoor air parameters and heat / coolant parameters.
- Supply air temperature control
- Protection of heaters from freezing
- Control of dustiness of filters
- Local and remote control vent. systems
- Alarm malfunction vent. systems
- Turn off all vent. systems in case of fire and the inclusion of smoke ventilation systems.