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BMS Sensors
26 June 2019
John Herbert
Director
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.
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they were deemed ugly, and have been replaced by BMS sensors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.
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.
