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An automated flow-temperature-humidity control system

G O Nelson, R D Taylor

American Industrial Hygiene Association Journal

|October 1, 1980

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A new automated system precisely controls air flow, temperature, and humidity for indefinite operation. This system achieves accurate environmental control (+/- 2% RH, +/- 0.3°C) without continuous operator intervention.

Area of Science:

Environmental control systems
Automated laboratory equipment
Process automation

Background:

Precise control of environmental parameters like temperature, humidity, and airflow is crucial for many scientific experiments and industrial processes.
Existing systems may require constant operator intervention or lack integrated control over multiple parameters.

Purpose of the Study:

To develop an automated system for simultaneous control of air flow, temperature, and humidity.
To create a system capable of indefinite operation without manual oversight.
To achieve high accuracy in environmental parameter regulation.

Main Methods:

Integration of a commercially available temperature-humidity indicator with a custom-designed flow-temperature-humidity control module.

Related Experiment Videos

Utilization of direct-reading dials for parameter setting.

Employment of a mass-flow controller for air flow regulation.

Implementation of process controllers linked to the indicator for humidity and temperature management.

Main Results:

The developed system enables automated and continuous control of air flow, temperature, and humidity.
Accurate environmental control was achieved: air flow (+/- 2% of full scale), temperature (+/- 0.3°C), and humidity (+/- 2% RH), assuming proper calibration.
The system demonstrated the capability for indefinite operation, minimizing the need for operator intervention.

Conclusions:

The automated system effectively integrates multiple environmental controls into a single, self-sufficient unit.
The system provides a reliable and accurate solution for maintaining specific atmospheric conditions.
This development offers a valuable tool for research and industrial applications requiring stable environmental parameters.