Clean Room Hvac Design Calculations

The width length and height of the classified rooms and their layout must be used for hvac calculations.

Clean room hvac design calculations.

This is achieved by supplying more air to the room than is extracted from it. The above suggested air changes per hour are only a design rule of thumb. The bigger the room the more air you need. The volume of air in the cleanroom will influence the amount of airflow needed.

They should be computed by an hvac cleanroom expert as many aspects must be taken into consideration such as the size of the room the number of people in the room the equipment in the room the processes involved the heat gain etc. The air change rate method of calculation is commonly used in cleanrooms with lower cleanliness requirements usually iso 6 to 9 with the air change rate largely based on the level of particles generated by people and processes. Rooms having 60 air changes per hour will have 60 times air supply then the volume of the room. Fda recommends maintaining the minimum 20 air changes per hour for clean rooms.

Calculations should be computed by a cleanroom hvac specialist. The volume of air in the cleanroom will influence the amount of airflow needed. If any form of variable air volume or load shedding system is used for energy conservation it must not compromise the corridor to room pressure balancing relationships or the minimum air changes required by the table. The bigger the room the more air you need.

People often forget that the height of the room directly impacts the airflow. People often forget that the height of the room directly impacts the airflow. If you want help with the design of your cleanroom fill out a request for quote and one of our experts will contact you. The hvac system requirements include.

If the supply of the air by hvac system in one hour is equal to the volume of the room then it will be one air change per hour. Hvac systems design fundamentals karachi pakistan february 22 2011 wei sun p e. Cleanrooms and hvac systems design fundament. During this technical presentation ashrae fellow and distinguished lecturer wei sun discusses the following.

2 the hvac system the integrity of the cleanroom environment is created by the pressure differential compared with adjacent areas through heating ventilation and air conditioning system. Supplying airflow in sufficient volume and cleanliness to support the cleanliness rating of the room. Design of the ventilation system shall provide air movement which is generally from clean to less clean areas.