Revisions to the majority of chapters, including major updates related to thermal storage and district heating and cooling, are included in the newly published 2016 ASHRAE
Handbook — HVAC Systems and Equipment. Nearly 90% of the chapters have undergone revision since the 2012 volume was published. The volume contains two major updates to chapters. Chapter 12, District Heating and Cooling, has new content from the new ASHRAE District Heating Guide and District Cooling Guide. Also, Chapter 51, Thermal Storage, has new content on grid reliability, renewable power integration, heat storage, emergency cooling, water treatment and commissioning. 

(Source: The HVAC&R Industry, June 23, 2016)