Title: (Optional) Describe the history and definition of direct digital control (DDC) systems.
Course: Heating, Ventilation, Air Conditioning, and Refrigeration II (17056-II) > Section: Exploring Emerging HVACR Technologies and Industry Considerations

Description should include a definition of DDC systems, how they are different from energy management systems (EMS), and a description of how digital controls save energy.

Process/Skill Questions:

- Why is a DDC used?
- Where is a DDC used?
- What are the applications for DDCs?
- What did the DDC replace?