ASHRAE Fundamentals of HVAC Control Systems SI and IP Edition

By Ahmed Shawky Last updated May 8, 2021

ASHRAE Fundamentals of HVAC Control Systems SI and IP Edition

The ASHRAE Fundamentals of HVAC Control Systems SI and IP Edition FOR ASHRAE, founded in 1894, is an international organization of some 50,000 persons. ASHRAE fulfills its mission of advancing heating, ventilation, air conditioning, and refrigeration as it serve humanity and promote a sustainable world through research,also standards writing, publishing, and continuing education.

The ASHRAE Handbooks are the design standard for control of built environments with volumes on Systems and Equipment, HVAC Applications, Refrigeration and Fundamentals. Each is updated every four years. In addition to publishing design guidance for engineers, architects, also facility managers, we also publish a series of texts for classroom use. Some of the areas we publish in include:

Both Energy Modeling and Auditing
High Performance Building Design
Psychrometrics
both Indoor Air Quality and Environmental Quality
Data Center Energy Efficiency
Noise and Vibration Control
Humidity Control
HVAC for Healthcare Facilities

ASHRAE Fundamentals of HVAC Control Systems SI and IP Edition

Chapter 1 introduces basic control concepts. It begins with a discussion of why controls are required in HVAC systems and a brief history of the development of control products. Next, we introduce the concept of a control loop, the basic building block of all control systems, also the various control strategies and algorithms used in control loops. After studying this chapter, you should understand:

Why controls are necessary in HVAC systems.
The difference between both open and closed control loops.
How two-position, floating, and modulating control loops work.
Proportional control.
Integral and derivative control action in modulating control loops.
How to tune control loops.
The difference between direct acting and reverse acting.
Difference between both normally open and normally closed.
How controlled devices sequenced using a single controller.

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Why Do We Need Controls?

We need controls and control systems because, in our modern age of technology, they make our lives more convenient, comfortable, efficient, and effective.also A control enables equipments to operate effectively and sometimes gives the ability to change their actions as time goes on and conditions or occupancies change. Also Controls are devices used to monitor the inputs and regulate the output of systems and equipments .

For example, when you shower in the morning you sense the water temperature and manually modulate the hot and cold water valves to produce the desired temperature. When you drive to work, you monitor your speed using the speedometer and manually control the accelerator of your car to maintain the desired speed.also When you get to your office, you sense a shortage of light so you manually switch on the overhead lighting