RUBBISH IN, RUBBISH OUT - Monitoring relative humidity is vital in maintaining efficient control of building services

摘要

A popular maxim amongst database users is "rubbish in = rubbish out" referring to the importance of high quality information on which to base decisions. The same can be said for building and energy management systems, where the control is only as good as the input from the environment that is being controlled. Of the various parameters that are measured to maintain a comfortable environment, relative humidity (RH) is one of the most difficult to measure accurately. This is because it is a truly analytical measurement where the sensor must make direct contact with the environment in contrast to temperature and pressure sensors, which are invariably insulated from the environment by a thermowell or a diaphragm.