Water & Wastewater Asia July/August 2022

SHOW REVIEW
of flow options which can be extended
to cover even larger flows by running
two or more iSave devices in parallel.
The device is designed for automatic
operation and is equipped with a rotorspin
that is controlled by the electric
motor, thus eliminating the risk of
overflow and overspin during start-up
and operation.
Subramaniam further shared a case
study which saw the deployment of
both the iSave ERDs and APP pumps
at a multi-island resort complex in
the Maldives. For this project, the
contractors designed four SWRO
trains that supply potable water to all
three islands. Each train is equipped
with a capacity of 500m 3 /day and is
built around an APP 22 and iSave 40.
Due to the compact design and
configuration, the APP pumps and
iSave ERDs were also adopted by
Fluence, which fitted the solutions
in multiple of its containerised units
for an SWRO plant in South Africa.
Furthermore, the pumps can be
employed for wastewater recovery
that requires high pressure, as he
elaborated: “Especially in China,
there is a requirement of zero
liquid discharge or minimum liquid
discharge. This involves concentrated
waste being pushed through the
systems at a very high rate.
“Danfoss’ pumps are equipped with
an operating pressure at about 70-80
bar. We also offer certain models that
operate at 120 bar, if required.”
Another speaker at the webinar
was Glenn Lemoncito, business
development manager – water and
wastewater – Asia-Pacific region,
Danfoss, who shared more on the
Danfoss VLT AQUA Drive FC 202
variable frequency drive (VFD). He
said: “VFD is a system that varies the
speed of the motor which is connected
to the pump. How is this related to
energy efficiency? It means using
less energy to complete the same job
but, in the process, reducing energy
bills and minimising pollution. Hence,
energy efficiency is geared more
towards Opex rather than Capex.”
As such, Lemoncito encouraged
plant operators to take harmonic
mitigation and heat management into
their consideration when selecting
their ideal VFD, as VFD creates heat
or energy loss of approximately 2%
of power rating. The general rule of
thumb he recommended was that
every 1kW of heat will require 0.4kW of
cooling or air-conditioning.
He cited an example of a project
in which Danfoss worked with the
Kuching Water Board in Malaysia,
where the latter had six drives
running at 710kW. The installation
of Danfoss Back Channel Cooling
solutions, which had a 90% backchannel
cooling effect, has enabled
the Kuching Water Board to achieve
energy savings in air-conditioning of
about 89%, or US$26,630 per year,
he said.
“Danfoss’ drives have the smallest
footprint in the market,” he concluded.
“By having a compact drive allows
operators to house a smaller panel
space and electrical room, hence
offering savings on electrical
room cost. This also translates to
fewer air-conditioning installations
because up to 90% of the drive’s
heat loss is removed directly outside
the installation room, therefore
achieving even greater energy savings
throughout the facility.”
Glenn Lemoncito,
business
development
manager – water
and wastewater –
Asia-Pacific region,
Danfoss, explaining
the Danfoss Back
Channel Cooling
solutions, which
offer up to 90%
reduction in airconditioning
system
and energy use for
air conditioning
62 WATER & WASTEWATER ASIA | JULY/AUGUST 2022