The brand of Vitasoy is not only a household name of beverages in Hong Kong,
but equally well known worldwide. The existing plant has been in operation since
1980’s and its operation requires chiller units which cool mainly office space
as well as some manufacturing and storage areas. The cost of operating the
chillers contributes significantly to Vitasoy’s overheads.
To further enhance the energy efficiency, CLP conducted Chiller Optimisation
Services on all four chiller units by using comprehensive and non-invasive
measurement techniques to determine the actual performance of each unit over
time. From site measurement, CLP discovered that the coefficient of performance
(COP) for one of Vitasoy’s air-cooled chillers had deteriorated significantly,
from the manufacturer’s specified level of 2.32 to 0.68. This chiller could not
help the other 3 chillers sharing the heat load as it was only running at around
10 to 20% efficiency most of the time and also worsen to direct the flow of
chilled water into this insufficient cooling plant.
With site verification and recommendation from CLP, Vitasoy decided to
replace the inefficient chiller unit and was completed in January 2015. Since
the COP for the new unit is 3.2, Vitasoy can save roughly 80% energy cost
through this chiller replacement alone. The company expects the payback period
within a year and a half.
Through measurements taken from different chiller units during various part
load conditions, CLP further recommended that Vitasoy manually sequence the
operation of the four chiller units to attain even better energy efficiency
without adding any investment cost.
If some chillers would give superior performance than others in full load or
part load conditions, it should be switched on first and for most of the time.
The operator is also reminded to keep existing chiller units full load as far as
practicable before switching on additional units in part load conditions.
Therefore, another 5% in energy savings are expected to achieve.
"Improving efficiency levels is critical to our bottom line and an essential
part of our drive to protect the environment. CLP’s Chiller Optimisation
Services was extremely effective in addressing the area to enhance efficiency,”
said Mr. Herbert Lee, Senior Manufacturing Manager, Vitasoy.
Centralised Dishwashing with Energy Efficiency and Quality
Experiencing the shortage of dish wash manpower especially during festive
seasons, two owners of restaurants decided to set up Diwash in year 2011. It is
a centralised dish washing system and the first-ever service to relieve the
pressure of manpower shortage. The service not only enhances the dishware
cleaning quality and working environment, but also creates the positive chain
effect of green initiatives to the restaurants.
Diwash is equipped with fully automated facilities. With CLP's assistance in
last year, the company adopted full electric operation for three process lines
in Kwai Chung workshop in order to reinforce their energy saving practices.
Having conducted the Energy Audit service from CLP, the energy efficiency of
system was further enhanced.
As Diwash requires significant supplies of hot water, CLP recommended the use
of energy-efficient heat pumps which are able to provide stable supplies and
constant temperature of hot water in 24-hours. This solution can cater long
operation of air conditioning and hot water supplies while supporting the
pre-wash operation. The heat pump can simultaneously generate hot water and cool
air with significant saving in energy cost of 66% for washing operation and
corresponding start-up time was shortened from 30 to 10 minutes.
To enhance the working environment and energy efficiency, Ricky Au and Alex
Liu, managing directors of Diwash, are adopting the LED, compact fluorescent
lamps and planning to install heat pumps in other workshops.