Design of climate AHU for laboratory
Our organization completed the installation and design of climate ventilation installations for the laboratory.
Подробнее ниже под катом..
DESIGNING A CLIMATIC INSTALLATION
Brief description of the object.
The vacuum testing and degassing section is located in the existing building on the 1st floor in room 5-6. This section serves the P6 intake and recirculation unit. In accordance with the terms of reference on the site, it is necessary to ensure ISO 8 cleanliness class according to GOST ISO 14644-1.
Initial data.
The design parameters of the outside air taken by SNiP 41-01-2003 and are:
the cold period of the year tn = -28 ° C;
warm period of the year tн = + 30 ° С;
the calculated air temperature in the premises is tvn = 20 ° C;
relative humidity of air - 40-50%.
Basic technical solutions
In accordance with the technical task of the project, it is planned to equip the room with supply and exhaust ventilation and maintain the required air parameters by the air conditioning system.
The existing air handling unit P6 and the designed exhaust system V1k provide the necessary flow of outside air. For removal of heat leakages in the room from the process equipment, a precision conditioner (PC), HPM M66 OA of the company Liebert Hiross is provided. Air handling unit and precision air conditioner provide the necessary air exchange rate for ISO 8 cleanliness class.
In the air handling unit, the outside air passes 3 stages of cleaning G4, F7 and F9 at the exit of the installation, is heated in winter and cooled from the existing external freon unit in summer. Directly at the entrance to the room in front of the supply grille is provided the 4th level of air purification in the HEPA filter class H11.
To maintain the humidity in the room provides:
- in the winter period, the steam generator AT 3000 2364 of the company Nordmann;
- for the summer period, air dehumidification due to undercooling in the air cooler section and subsequent reheating to the set temperature in the electric air heater PBER 500x300 / 12 N = 12kW.
In a precision air conditioner with top air distribution, the recirculated air is cleaned in the G4 filter and distributed through the duct into the room. Before each distribution grid, a HEPA filter of class H11 is installed.
For year-round operation of a precision air conditioner, a low-temperature kit is provided.
Placement of installations
Air handling unit P6 are located in the existing ventilation chamber.
The exhaust duct fan is located in the ceiling space in the serviced room.
Precision air conditioning is installed directly in the room, air condenser HCE-42 (2 pcs.) - on the street on the ground next to the outer wall of the room.
Air ducts are laid in the ceiling space.
Thermal insulation subject to:
- distributing air ducts from the P6 air handling unit and air conditioner;
- copper pipeline air conditioning system.
For the removal of condensate from the PC provides for the withdrawal of the pipeline directly to the street. For protection from freezing of the outlet section of the drainage pipeline, a heating electric cable is provided.
To reduce the aerodynamic and mechanical noise from the equipment, the following measures are envisaged:
- fans are installed on anti-vibration supports;
- on the suction and discharge pipes vent. units are installed flexible inserts;
- silencers are used on the main ducts at the outlet of the installations;
- fan-units are used in soundproofed housing;
- connection to the ventilation grilles is carried out by flexible sound-insulated air ducts.
- air velocity in floor ducts does not exceed 4 m / s.
As fire prevention measures, it is planned to install fire-retarding valves at the intersections of ventilation chambers and serviced premises by air ducts.