Control of natural ventilation (TN 11/95)

This publication provides guidance on the application of building management system controls to natural ventilation. It explains how the provision of automatic control of air inlet vents with inaccessible air outlet vents results in improved ventilation rates, particularly in the summer, thus enhancing the environment in which people live and work. In addition, automatic controls offer the opportunity for night cooling, thus helping to ameliorate daytime heat gains. It presents a number of generic control strategies for natural ventilation, mixed- mode ventilation and night cooling. The guide describes procedures for commissioning and fine tuning buildings using these strategies, together with appropriate control set points. It also reinforces the guidance with the results of monitoring carried out in three naturally ventilated buildings. And concludes with details of the control strategies of eight further building case studies. It presents a cost analysis of the use of the different ventilation types.