REHVA Guidebook No 23 - Displacement Ventilation

The guide book discusses two principal methods which can be used when the supply air flow rate of displacement ventilation system is calculated: 1) temperature based design, where the design criterion is the air temperature in the occupied zone of the room and 2) air quality based design where the design criterion is the air quality in the occupied zone. Some practical examples of the air flow rate calculations are presented. The air flow diffusers are the critical factor: most draught problems reported in rooms with displacement ventilation are due to high velocity in the zone adjacent to the diffuser.

This guide explains the principle for the selection of diffuser. This guide also shows practical case studies in some typical applications and the latest research findings to create good micro climate close to persons is discussed. These and some other aspects are discussed in this book. Authors believe you will find this guide useful and interesting when you design or develop new ventilation solutions.