DDC Controls

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Course Overview

Plan ahead and mark your calendar!  This course is being planned for October 18-22, 2021 in Madison, WI (in classroom).  Date is not guaranteed - course will be scheduled and enrollment will become available when campus lifts instructor travel restrictions.  Please add your name to the notification list using the button on this page marked "Notify Me of Upcoming Courses."

DDC system components, terminology and design options have created many challenges for engineers and facility operators. Open protocols have also increased customer expectations, but have added complexity to the planning and design process. If you plan, design or specify DDC systems, you will receive a comprehensive understanding of of current technologies and options.

Master direct digital control systems by learning how to:

  • Define your DDC requirements to control HVAC and related building systems
  • Identify the hardware and software elements that make up a DDC system
  • Evaluate the advantages and/or drawbacks of open systems (BACnet)
  • Plan for IT and cybersecurity concerns
  • Avoid common problems when controlling air handling units, VAV systems, central plants, and more

Who Should Attend?

  • Consulting, design, and energy engineers
  • Building owners, facility managers, and operating staff
  • Commissioning authorities
  • Contractors and building HVAC control service organizations
  • Technicians responsible for the design, acquisition or operation of environmental control systems in commercial, institutional, or industrial facilities

Click here to learn more about the course instructors.

Additional Information

Examine the capabilities of DDC systems and learn:

  • The importance of having a planned system architecture
  • If open protocols add value with respect to your requirements
  • Control strategies for a variety of HVAC system types

This course will give you a broad range of knowledge to understand the principles and technical concepts used by various manufacturers. This understanding is essential to acquire, implement, and operate a cost-effective system. While various manufacturers are discussed during the course, the course content is not specific to any vendor.

A laptop computer or tablet is required for the course.

**Supplemental Content is included in course materials, but may or may not be presented during class based on time and attendee questions/requests.

Course Outline

Download the full agenda in PDF format here

MONDAY (8 AM to 5 PM)*

Course Overview

Introduction to DDC Systems

  • Basic elements of control
  • Feedback concepts
  • Loop response
  • Terminology
  • Types of hardware, software, and firmware

Introduction to the Controlled Systems: Part 1, Load Dynamics 

The Nature of the Problem

  • Developing a Simple Control Loop

Supplemental Content: Introduction to the Controlled Systems: Part 2**

  • Pumps and Fans
  • Ducts and Pipes
  • Heat Exchangers
  • Refrigeration Cycles and Cooling Equipment
  • Boilers and Heating Equipment

Input and Output Data Flow

  • AI, DI, and PI
  • Analog to digital conversion
  • Sensor types, applications, accuracy, stability, calibration, and other factors
  • Safeties, limit devices, and power monitoring
  • AO, DO, and PWM
  • Digital to analog conversion
  • Transducers; damper and valve actuators
  • Configuring network data flow
  • Important performance factors

 

TUESDAY (8 AM to 5 PM)

Inputs and Outputs: The Field Perspective

  • Where We Came From
  • Averaging Sensors, Thermal Lags, Position Effect Proxies
  • Calibration Offset vs. Multi-Point
  • Actuators
  • Code Issues and Terminal Strips

Supplemental Content: Pneumatic Controls**

System Architecture

  • Network concepts
  • Generic components
  • Communication concepts
  • Local vs. global information
  • Installation issues

IT Considerations

Open Systems – the Myths and Realities

  • Do you want an open system?
  • Understanding IT vs. DDC
  • Cautions and concerns
  • Different levels of open systems
  • Engineering issues

Cybersecurity

 

WEDNESDAY (8 AM to 5 PM)

System Architecture for BACnet

Supplemental Content: Network Architecture, from the Field Perspective**

Programming Tools

  • Types of programming
  • Logic diagrams and programming symbols
  • Designing control logic

Controlling Analog Processes 

  • PID Control
  • Open Loop vs. Close Loop Tuning
  • Lags and the Two Thirds Rule
  • Supplemental Content: Controlling Analog Processes – Lags**
  • Supplemental Content: Controlling Analog Processes – The Impact of Lags, an Example**
  • Supplemental Content: Controlling Analog Processes – Guidelines for Tuning Loops and Functional Testing**

Application Requirements: The System Concept

  • Organizing your information
  • Process by process approach
  • Supervisory logic
  • Working with System Diagrams

Controlling the Mixed Air Section 

  • Strategies and control logic
  • Assessing an Economizer in the Field
  • Supplemental Content: Mixing Air**
  • Supplemental Content: Limiting Economizer Operation**
  • Supplemental Content: Assessing an Economizer**

 

THURSDAY (8 AM to 5 PM)

Controlling the Air Handling Unit Section

  • Heating, cooling, humidification, and reheat

Controlling the Fan

Controlling Constant Volume Systems 

Central Plants: Pump Interactions and Affinity Laws

  • Controlling a Condenser Water System
  • Supplemental Content: Controlling Different Central Plant Technologies**

 VAV Systems

  • Terminal Unit Basics
  • Supply and Return Fan Flow
  • Loads and Coil Discharge Temperatures
  • Minimum and Maximum Flow Settings
  • Supplemental Content: Flow and Pressure Measurement**

                 

FRIDAY (8 AM to 12 Noon)

Defining, Planning, Procuring DDC Systems

  • Architecture; Types of Hardware
  • Integration and/or Interoperability Concerns
  • Operator Interfaces; Training
  • Acquisition Strategies; Sole-Source vs. Multi-Vendor
  • Open Protocols
  • Key to Success

Specifying Your System

  • System Descriptions
  • Materials; Devices; Hardware & Software
  • System Setup
  • Specifying Commissioning of DDC

DDC System Commissioning 

  • Documentation Review
  • Start-up Checks
  • Functional Performance Tests (FPT)
  • The Five Principles of DDC

Instructors

Steve Briggs

Steve Briggs, PhD, senior engineer, Facility Dynamics Engineering in Champaign, Illinois, has worked on the development of guide specifications for Open Building Automation Systems based on BACnet and LonWorks for the Corps of Engineers. He is also a consultant to the Army and General Services Administration (GSA). He brings a strong electrical engineering perspective to the area of direct digital control.

J Santos

Jay Santos, PE, president, Facility Dynamics Engineering, Columbia, Maryland, is a consulting engineer with more than 25 years of experience in HVAC system troubleshooting, modernization, and automation, he has served commercial, institutional, and industrial clients worldwide. He is a highly respected educator, having supported the HVAC continuing education programs of several major universities.

David Sellers

David Sellers, senior engineer. Facility Dynamics Engineering, Portland, Oregon, has more than 30 years of experience with commissioning, design engineering, facilities engineering, mechanical and control system contracting, and project engineering. His work spans a wide array of facilities, ranging from hospitals and semiconductor clean rooms to commercial office buildings and research/pilot projects in the energy efficiency and sustainability arena.

Joy Altwies

Joy Altwies, PhD, PE, LEED AP+, is a Program Director for the University of Wisconsin-Madison Office of Engineering Professional Development (EPD). For over 16 years, Dr. Altwies has developed and taught continuing education courses emphasizing high-performance building design and construction, mechanical system design and operation, energy efficiency, and commissioning. She is also Program Director of the Master of Sustainable Systems Engineering (SSE) degree program and an instructor of two graduate courses in the program.

Prior to joining the University of Wisconsin, Joy worked as a consulting engineer focusing on energy efficiency and environmentally responsible building design and construction. She provided commissioning services for a variety of projects with a strong emphasis on green and sustainable building principles. She also provided LEED assistance and green design opportunity analysis for clients seeking these specialized services in the commercial building market. As a certified home energy rater for the national Energy Star Homes® program, her work also encompassed the residential building market.

Dr. Altwies is an active member of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE), where she currently serves as Vice Chair and Research Chair for the Building Environmental Impacts and Sustainability technical committee (TC 2.8). She has also served on committees for the U.S. Green Building Council and is a former member of the Board of Directors of the Wisconsin Green Building Alliance.

Joy earned a Doctorate in Environment and Resources through the Gaylord Nelson Institute for Environmental Studies at UW-Madison. Her interdisciplinary research investigated the impact of building energy code policies on technology adoption in the commercial and residential building sectors. She also holds Bachelor of Science and Master of Science degrees in Mechanical Engineering.

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Program Director

Joy Altwies

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