Controls & Automation Solution Summary
The purpose of an airborne infection isolation room (AII) is to contain the infectious disease so that it does not spread to healthcare workers, other patients and the community.
The room draws air in, keeps contaminates in, and exhausts to outdoors. The key control parameter is Room Pressure Differential (Pa) which depends on:
- Exhaust – supply flow differential (L/s). The offset must be monitored to verify room remains at negative pressure and has good inward airflow.
- Room envelope leakage area (m²)
Volumetric Flow Tracking Control
We recommend volumetric flow tracking as this method measures both exhaust and supply airflow and controls the differential airflow called offset to maintain a desired room pressure. Flow tracking can provide more stable control and is independent of room door operation compared to traditional room pressure control that contractors are accustomed to.
Engineering parameters can be easily pre-set, and extremely tight construction is not necessary.
The flow offset as a minimum must be greater than the accuracy of the flow measurement and associated control error.
Advantages of volumetric flow tracking include the following:
- Low pressurisation level (normally -2 to -10 Pa)
- Less tight construction required
- Simple set of relative pressurisation levels (one or two levels)
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