|According to the Confederation of
British Industry, 30% of the energy that companies buy
is wasted. The Royal Institution of Chartered Surveyors
estimates that buildings in the UK account for around
44% of our carbon emissions. As energy costs continue
to spiral, we can expect more and more regulations that
require us to install equipment that not only controls
and regulates energy use, but that helps us to understand
where and how the energy is used. Part L2 of the building
regulations 2010 states “Reasonable provision for
energy meters would be to install energy metering systems
that enable at least 90% of the estimated annual energy
consumption of each fuel to be assigned to the various
end-use categories (heating, lighting etc.)”
There is no doubt that meters help building owners and
managers account for energy use, and that this knowledge
should form a strategy for energy reduction initiatives.
Part L also requires that in buildings with a floor area
of greater than 1000m2
Part L also states: “Meters should be provided to
enable the performance of any renewable energy system
provided as part of the works to be separately monitored
and in buildings with a total floor area greater than
1000 m2; the metering system should enable automatic meter
reading and data collection.”
Buildings of this size normally have a BEMS. Therefore
a sensible strategy would be to integrate the metering
with the BEMS system, which has the capability to process
data and present in many formats, from simple graphs right
up to data export to enterprise level.
The simplest way to record fuel consumption is via a pulse.
The BEMS can count the pulses and create usage trends
and graphical data. More sophisticated meters –
smart meters (http://en.wikipedia.org/wiki/Smart_meter)
– are able to accumulate a greater amount of data
in a much more sophisticated manner. For example where
an electricity pulse meter may only deliver a pulse per
kWhr, a smart meter will be able to monitor voltage, current,
kWhr, kVaHr, power factor etc. The information is presented
whether or not there is a requirement to process the information.
A further benefit of smart meters is their ability to
record data if the BEMS is disconnected, or develops a
problem. When the BEMS goes back online –the data
is has accrued.
Horizon Controls can advise you on your smart
metering strategy, and supply the equipment you require,
and advise you how to get the information you need from
your smart meters into your BEMS system, which is normally
by collecting pulses, or providing MODBUS OR M-BUS interfaces.