QNET 2.0 HVAC Board

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Teach Fundamentals of Fluid Dynamics and Thermodynamics Control

The QNET 2.0 Heating, Ventilation and Air Conditioning (HVAC) Board is ideally suited to teach and demonstrate the fundamentals of climate control. Developed exclusively for NI ELVIS platform and LabVIEW™ software, the system can easily be configured to control the temperature in a chamber using a variety of control methods. Students learn how to:

  • model a system
  • design and implement a relay feedback controller to control the temperature in the chamber
  • design and implement a proportional-integral (PI) controller to control the temperature in the chamber

How It Works

The QNET 2.0 HVAC Board provides an integrated amplifier and a communication interface with the NI ELVIS II(+), interfaced to a PC or laptop via USB link.

The QNET 2.0 HVAC Board consists of a heating chamber with a heater and a brushless DC fan to transfer the heat to the heating channel. The heater is a PWM voltage-controlled amplifier that generates heat by applying the input voltage to an array of resistors in parallel. Six high accuracy temperature sensors are placed along the heating channel. Additional sensors measure ambient and heating chamber temperatures. The temperature measured inside the chamber is controlled using the heater voltage while the fan is ran at a constant speed. Heat is transferred to the sensors by radiation from the heater and by convection from the air stream. Radiative heat transfer is highly nonlinear and it is therefore difficult to model the system by first principles. Therefore, empirical tuning is used to control the system. This heat transfer plant is very similar to the systems that are used to control wafer temperature in semiconductor manufacturing.

The QNET 2.0 HVAC Board is fitted with a variety of safety measures to ensure proper system configurations. Status LEDs provide feedback to users.

Comprehensive Resources and ABET-aligned Courseware Included

The QNET 2.0 HVAC Board comes with comprehensive digital resources developed by Quanser to enhance teaching controls. These resources save professors’ time, while helping students quickly grasp the capabilities of the board, relate the studied control concepts to applications in real world and understand the exercises performed in lab. The resources include:

  • ABET-aligned courseware with in-lab exercises
  • detailed ABET assessment guidelines and scoring sheets
  • setup materials, including Quick Start Guides, User Manual and VIs for the trainer ensure faster, easier setup of the experiment
  • pre-designed VIs help students understand how the theoretical block diagrams relates to the actual implementation

  • Compact system for NI ELVIS II(+)
  • Plug-and-play design for quick and easy lab setup
  • Variable control of the heater
  • Fixed speed fan
  • Direct heater temperature sensor
  • High accuracy temperature sensors
  • Comprehensive digital resources and ABET-aligned courseware included
  • Fully compatible with LabVIEW
  • Fully documented system models and parameters provided for LabVIEW™
Heating element total nominal resistance 29.5 Ω
Heating element total tolerance ± 1%
Heating element maximum power output 19.5 W
Amplifier type PWM
Amplifier peak current 2.5 A
Amplifier continuous current 0.5 A
Amplifier output voltage ± 24 V with 100 % duty cycle
Fan rated voltage 5 V
Fan speed 8,500 rpm

Topics covered in the Quanser-developed courseware:

  • Temperature control
  • Relay / on-off control design
  • System modeling
  • Parameter identification
  • Model validation
  • PI control design
  • Saturation and integrator windup
  • Feedback control set-point weighing
The QNET 2.0 HVAC Board can be also used to teach other topics that are not included in the Quanser-developed courseware.

To set up your QNET 2.0 HVAC Board, you need NI ELVIS II(+) Modular Engineering Education Laboratory Platform.

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