Cleanrooms are divided into several types based on the flow state of the airflow
According to the activity state of airflow, there are mainly three types of cleanrooms with dispersed airflow:
(1) Non unidirectional flow cleanroom: Once commonly referred to as turbulent flow cleanroom, the airflow inside the room does not move in a single direction. There are several common features of non unidirectional flow cleanrooms: the terminal filter (high efficiency or sub high efficiency) is located as close as possible to the cleanroom, and it can be either a supply air outlet or a continuous supply air outlet, or connected to the room's supply air static pressure box; The return air ports are all located at the lower part of the clean room to avoid the phenomenon of "dust lifting". Eddy currents exist in non unidirectional flow cleanrooms and are not suitable for use in high cleanliness cleanrooms. They are suitable for use in cleanrooms of grades 6-9.
(2) Unidirectional flow cleanroom: The characteristic of airflow in a unidirectional flow cleanroom is that the streamline is parallel, moving in a single direction, and the wind speed is consistent across the cross-section. There are straight unidirectional cleanrooms, quasi straight unidirectional flow, horizontal unidirectional flow cleanrooms, etc.
(3) Vector cleanroom: Air is supplied to the upper corner of the room, using a fan-shaped high-efficiency filter or a general high-efficiency filter with a fan-shaped air outlet. A return air outlet is installed at the lower part of the other side. The height to length ratio of the room is generally between 0.5 and 1. This cleanroom can also achieve a cleanliness level of 5 (100).
The flow patterns in clean rooms are basically the three types mentioned above, but in practical applications, they can evolve into many forms. A clean room can be a mixed flow pattern that combines unidirectional and non unidirectional flow to achieve high-end cleanrooms in certain areas (unidirectional flow portion). For example, in a clean room, a horizontal unidirectional flow "tunnel" (with one side open) is set up, and the rest of the clean room follows a vortex unidirectional flow pattern, thereby achieving a cleanliness level of 5 or above in the "tunnel" section. The workbench is then set up inside the "tunnel".
The article originates from Guangdong Purification Engineering: http://www.0571pet.cn/
-
07-01
Guangdong Purification Engineering: What are the cleanroom construction companies?
Our cleanroom needs to go through several processes to be built. In the early stage, we need to start with the design, followed by the specific construction stage, and then the acceptance and other pr
-
12-19
A Brief Discussion on the Development Factors and Variables of Hunan Purification Engineering
Purification engineering can effectively utilize the six cost element variables mentioned below, provide selectable planning plans, improve fundamental purification engineering planning and standards,
-
11-27
How to effectively utilize the air conditioning system in the purification workshop of Hunan Purification Engineering Analysis
The energy consumption of HVAC system accounts for about 60% of building energy consumption, so energy conservation of HVAC is particularly important in building energy conservation. The purification
-
11-20
How to Reasonably Control and Mediate the Cost of Hunan Purification Engineering Analysis
When planning the manufacturing of purification engineering, how to achieve maximum benefits with minimal investment and complete maximum output has always been a highly valued issue for purification