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BMS Sensors
26 June 2019

John Herbert, hong kong energy saving expert, BEAM expert
John Herbert

John Herbert
John Herbert

Where two or more separate automatic control systems operating in the same space , conflict is inevitable, wasting energy.

Identical sensors are not in fact identical, they drift and drift at different rates. Slight variations in manufacturing mean the sensor and its deadband can vary.

For example, two sensors in the same space, one sensor registers a slight increased, and rising room temperature, so demands more cooling, the another sensor registers decreasing temperature and demands more heating. After an hour both sensors settle measuring different values for the same space, wasting an enormous amount of energy, this frequently occurs in data centres.

BMS DDC HVAC poor sensor location

Remember those old fashion clunky wall mounted thermostats? they were deemed ugly, and have been replaced by BMS sensors often relegated to horrible positions, far from the occupants.

We dont need to conduct a study the cause and effect is obvious, so over-cooling of the space wasting millions every year.

BMS DDC HVAC poor sensor location

Decarbonisation? Get the basics right first, every sensor must be in the proper location, without undue influence, if over-cooling and wasting energy is to be avoided for the lifespan of the building.

About the Author

John Herbert is a veteran chief engineer with more than 30 years international engineering experience, educated in the United Kingdom, he has worked in the United Kingdom and then across Asia for more than two decades engaged by international and local companies. He is a Hong Kong Registered Energy Assessor (REA), a BEAM Professional, and stationed in Hong Kong.

BMS HVAC sensor conflict, BMS, commissioning


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