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Humidity Controller Project #23

This project presents a humidity controller designed to improve precision in humidification, addressing challenges such as long time constants and sensor precision. Inspired by interest in control systems and experiences at an Air Conditioning Research Center, the design focuses on low-cost solutions with quick steady-state capabilities. It incorporates integral and proportional control techniques using discrete analog ICs, and features a four-stage functional block design. Recommendations suggest further testing in a humidity chamber and exploring integrated circuit possibilities for automation.

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Humidity Controller Project #23

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  1. Humidity ControllerProject #23 By Gary Stoedter for ECE 345 Senior Design Laboratory

  2. Introduction: why I chose this particular project • Interest in controls • Work experiences at the Air Conditioning Research Center • The opportunity to help solve a “real world” problem

  3. What makes the humidification process difficult to control? • Long time constants • Humidity sensors are not very precise • Humidity is usually controlled indirectly through temperature

  4. Controller Design Objectives • More precise control than what is commercially available now • Compatibility • Low cost • Ability to achieve steady state quickly

  5. Initial Ideas for the Design • Emphasis placed on integral and proportional control • Discrete analog IC’s for each function to help clarify circuit operation • Synchronization of output with 60 Hz AC line to achieve compatibility goals

  6. Functional Building Blocks of the Controller • Stage One: Input and Error Generation • Stage Two: Error Conditioning • Stage Three: Synchronization • Stage Four: Comparison and Final Control

  7. Special Problems That Occurred • Unfamiliarity with the actual physical devices • Ramp generator • Error signal limits • Thermocouple input scaling • Integral control limits • Calibration

  8. Tests Performed to Insure Functionality • Measurement of time constant • Measurement of ability to hold temperature • Measurement of ability to move from one set-point to another and achieve steady state

  9. Did the final circuit meet expectations? • No direct testing with a humidifier • Level of control achieved in a temperature control setup • Interface between circuit and DA system achieved • Low cost achieved

  10. Recommendations • Actual testing of the circuit with humidity chamber • Further study to see if an IC can be built using this controller design • Investigation of automation possibilities

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