Dental Clinic - Ventilation and Conditioning

EXPLANATORY NOTE

Source Data

This section of the project is based on:

- architectural and construction drawings;

- technical assignment;

- Existing rules and regulations:

SNiP 41012003 "Heating, ventilation and air conditioning"

SNiP 230199 * "Construction climatology" (from rev.1)

SNiP 23022003 "Thermal protection of buildings"

SNiP 210197 * "Fire safety of buildings and structures"

SNiP 22032003 "Noise Protection" (SNiP II1277)

SNiP 2080289 "Public buildings and structures"

Manual to SniP 2080289 "Health facilities"

SanPiN 2.1.3... 08 "Sanitary and hygienic requirements for dental medical organizations"

Climatological data

2.1 Design parameters of outdoor air are taken as follows:

-computed ambient temperature for ventilation design

(warm period, parameters A) plus 20.5 ° С;

-computed ambient temperature for ventilation design

(cold period, parameters B) minus 26 ° С;

2.2. Internal air parameters are accepted:

- in summer - plus 25 ° С;

- in winter - plus 18 ° С;

- relative humidity - not more than 60% (as per GOST 3049496).

Heat supply source

The source of heating of the ventilation system is the electric network.

Main indicators for ventilation system

Main decisions made on ventilation and air conditioning

The main hazards are thermal precipitation and the release of carbon dioxide from people, heat emissions from solar radiation and lighting.

To maintain the required parameters of the air environment in the premises: working rooms of doctors, a staff room, a hall, utility rooms, plenum and exhaust ventilation is provided.

The calculation of air exchanges in the premises of the dental center was carried out on the basis of a technological task. Multiplicity standards in serviced rooms are taken from SanPiN 2.1.3... 08 "Sanitary and hygienic requirements for dental medical organizations." Calculation of air exchanges is provided (see annex 1).

The supply systems (P1, P-2, P-3) provided by the design provide:

• cleaning of outdoor air in filters of class EU7;

• in the cold period of the year air heating in an electric air heater;

• air supply by fan.

Channel fans (B1÷B3) provide removal of air from the served rooms.

For outdoor air pre-cleaning, a class EU3 filter installed after the air intake screen is provided.

Supply air supply is organized from the suspended ceiling, superuvniz, overlaying conical jets, using Arktos air distributors. Air velocity in the working area is 0.2 m/s.

Equipment of plenum and exhaust systems is located in the room of the ventilation chamber located directly in the clinic (item 8). To reduce noise, additional insulation of this room is provided.

Outdoor air intake is provided by the design at elev. + 3.300 (air intake grid on the building facade). Air release is provided at elevation + 36.000 (+ 2.000 from roof level). The place for installation of the exhaust duct is chosen in order to avoid overflow of the exhaust air through the windows to nearby apartments.

On assignment for design, for assimilation of thermal waste, air conditioning systems are provided, based on splits systems, in the following rooms: therapeutic, surgical, orthopedic rooms (system X1, X2) and hall (system X3, X4) for visitors.

The system X1, X2 includes an external unit (located on the facade of the building) and three internal (wall) units. The system X3, X4 includes an external unit (located on the facade of the building) and one internal unit (channel design) located in the space of the false ceiling.

Ventilation system equipment is selected according to the following principles:

• high quality and reliability;

• long-term motor resource;

• Adaptability for winterization;

• complete control and protection automation system;

• low noise level;

• compact dimensions;

• Easy maintenance and installation

• optimal price-quality ratio.

In this regard, the project adopted the following imported equipment:

The equipment of supply and exhaust systems is accepted by Systemair, Sweden. Split system equipment accepted by Mitsubishi Electric

Cold supply

Freon R410A is used for cold supply of splits.

Measures to reduce vibration and noise

Permissible sound pressure levels created in rooms by ventilation units are accepted in accordance with SNiP 22032003 "Noise Protection."

To reduce noise and vibration from ventilation installations of air ventilation systems, the following measures are laid down:

• limitation of air velocity in air ducts and air distributors;

• installation of noise silencers in all systems from the side of pumping and suction;

• installation of flexible inserts between fans and air ducts connected to them;

• additional soundproofing device in the ventilation chamber partitions.

Corrosion protection and thermal insulation

All ducts are made of galvanized steel.

To avoid heat loss, the following shall be isolated:

• cold supply system pipelines;

• air ducts in the area from the external grid to the heater.

Automation, locking, monitoring

The design provides for the installation of supply and supply equipment equipped with automation tools that provide control, automatic regulation, equipment protection, blocking of ventilation systems.

Automation of plenum chambers is accepted according to the corresponding schematic diagrams of the equipment manufacturer in full.

Automation kit provides:

• automatic shutdown of ventilation systems in case of fire;

• automatic control of ventilation system operation parameters depending on ambient air temperature;

• fan motor speed control;

• protection of fan motors against overheating;

• protection of heaters against overheating.

Saving Heat Resources

Thermal savings are achieved by:

• heat insulation of coolant freon pipelines;

• automatic control of heating plants operation.