Every year your customer has to clean their tower basin and chiller tubes due
Offer Filtration Systems with .2#/7# pressure drop, cleanable while in operation and fully automatic. 100% flow
filtration, to reduce the TSS and greatly reduce make up water flushing saving thousands to millions of gallons of
expensive water every year.
- 1. Offer automatic water filtration from 2 – 3500 microns full flow or side stream.
- 2. Offer manual water filtration from 2 – 3500 microns full flow or side stream.
- 3. Centrifugal Solids separators don’t work with variable volumes.
- 4. Basket or Bag filters plug too fast and don’t get cleaned. (Just ask)
- 5. Largest surface area strainer for lowest pressure drop.
- 6. Best cleaning options for best efficiency.
Cooling Tower Filtration
Suction-scanning technology makes elegant use of
simple physics. As the filter screen captures particles,
the pressure differential between the inside surface
(the inlet side) and the outside surface (the outlet
side) of the screen increases. When that pressure
differential reaches 7 psi, the Amiad system opens an
exhaust valve. The exhaust valve drains the suction
scanner, a hollow 316 stainless steel tube tipped with
nozzles just millimeters from the screen surface.
Opening the exhaust valve to the unpressurized
outside environment causes water to flow in a
high-velocity stream backwards across the screen
into the nozzles, carrying the captured particles,
or filter cake, with it.
The nozzles concentrate the suction effect on less
than one square inch of screen at a time, creating
a powerful and highly effective cleaning force - a
phenomenon we call "focused back flushing." The
suction scanner travels down the screen in a
spiral pattern at a fixed speed, cleaning 100% of
the screen surface in a 25-to-40-second stroke.
One large potential hindrance to desired chiller performance is heat-transfer efficiency. Chiller performance and efficiency relate
directly to its ability to transfer heat, which begins with clean evaporator and condenser tubes. Large chillers contain several
miles of tubing in their heat exchangers, so keeping these large surfaces clean is essential for maintaining high-efficiency
Chiller efficiency deteriorates as tubes become fouled, when mud, algae, sludge, scale or contaminants accumulate on the
waterside of heat-transfer surfaces. The rate of fouling depends on the system type — open or closed — as well as on water
quality, cleanliness and temperature.
Most chiller manufacturers recommend cleaning condenser tubes annually, since they typically are part of an open system, and
they recommend cleaning evaporator tubes once every three years for closed systems. But if the evaporator is part of an open
system, they recommend periodic inspection and cleaning.
Managers can consider two primary methods for cleaning tubes:
* Mechanical cleaning removes mud, algae, sludge and loose materials from smooth-bore tubes and consists of removing the
water-box covers, brushing the tubes and flushing with clean water. For internally enhanced tubes, managers should consult the
chiller manufacturer for mechanical-cleaning recommendations.
* Chemical cleaning removes scale. Most chiller manufacturers recommend consulting with a local water-treatment supplier to
determine the proper chemical solution required. A thorough mechanical cleaning should always follow a chemical cleaning.
New chillers feature automatic tube-brushing systems, which can be retrofit onto existing chillers. These systems use small,
nylon-bristled brushes that flow through the tubes for cleaning. A custom-manufactured, four-way reversing valve is installed in
condenser water-piping system, and every six hours, the system automatically reverses the flow through the condenser tubes for
about 30 seconds.
Coupled with proper water treatment, these systems virtually eliminate fouling within the chiller and maintain design-approach
temperatures. These systems typically show payback periods of less than two years.
Step 3: Ensure a Leak-free Unit
Want to improve your chances of convincing bean counters
that investments in energy projects are worthwhile? Stop
talking about payback periods and start talking about return
on investment, said speakers at the Facility Decisions
conference and exposition in Las Vegas.
What payback periods their organizations would approve. No
hands went up at 10 years; few went up at five. But a
five-year payback equals a 20 percent ROI, Whitson pointed
out. A four-year payback offers a 25 percent return. And if a
project pays for itself in three years, the ROI is 33 percent.
Those numbers give facility executives a much more powerful
tool to sell energy efficiency projects than payback periods
Putting a project in terms of ROI may help facility executives
win funding for projects that exceed the organization's stated
investment horizon. Consider an organization that is willing to
consider only energy efficiency investments with payback
periods of 18 months or less. By that criterion, a project with a
50 percent ROI will be turned down. When the energy project
is put in terms of ROI, the finance department may be willing
to consider its investment horizon.