HVAC free cooling is a technology that uses outside air to cool a building without the use of a mechanical refrigeration system. This can be a very energy-efficient and environmentally friendly way to cool a building, especially in climates with cool winters and moderate summers.

There are two main types of HVAC free cooling: direct and indirect. Direct free cooling systems pass outside air directly over the cooling coil of a chiller or air handling unit (AHU). Indirect free cooling systems use a heat exchanger to transfer heat from the chilled water loop to the outside air.

HVAC free cooling can be used in a wide range of buildings, including commercial buildings, industrial buildings, and data centers.

This book is intended to provide a comprehensive overview of HVAC free cooling, including its benefits, drawbacks, applications, and design and implementation considerations. It is written for a variety of audiences, including building owners, facility managers, engineers, and students.

I hope that this book will be a valuable resource for anyone who is considering or is already using HVAC free cooling.