Tuesday 2 June 2015
Saturday 30 May 2015
Where can I use a RABΞScreen BHA or BHC air intake filter screen?
RABΞScreens
RABΞScreen Protection stops debris before it costs you time, energy & money
Where can I use a RABΞScreen BHA or BHC air intake filter screen?
Anywhere that you have air movement. It does not matter what shape or size of opening we can design an air intake screen to suit every application. Dry air coolers, chillers, air handling units, condensers, cooling towers, intake louvres and air intakes of any design.
BHA – single layer of black, high abrasion polymer coated, polyester mesh. Black Pvc Coated High Abrasion Media is a 9x9 1000 Denier Multi Polymer Coated Polyester Mesh. The air flow resistance of a clean BHA air intake screen single layer is as follows:
0.50m/s 1.25pa
2.03m/s 8.75pa
3.05m/s 17.00pa
2.03m/s 8.75pa
3.05m/s 17.00pa
BHC – single layer black huckaback woven polypropylene. Black Polypropylene HoneyComb Weave is a three Dimensional Polypropylene Honey Comb Weave which has a low air flow resistance whilst the electrostatic charge attracts airborne debris.
It can also be supplied in multiple layers of media to improve particle capture of 3 micron particles to 93%. The air flow resistance of a clean BHC air intake screen single layer is as follows:
0.50m/s 1.25pa
2.03m/s 12.45pa
3.05m/s 22.42pa
2.03m/s 12.45pa
3.05m/s 22.42pa
Where would you use BHA or BHC?
The BHA air intake filters can only be used in a single layer but it is a high abrasion filter and is perfect for the majority of applications where seed, pollen, leaves and insects are an issue.
The BHC air intake screen is for use where fine particulate is a problem and a multiple layer filtration solution is required. Ideal for fine cement, flour, copier ink and other extra fine particulate.
Tuesday 31 March 2015
Air Intake Filter Screens Prevent® and solve air intake problems
Permatron manufactures some of the world's leading air filters which
are used to protect expensive HVAC equipment by stopping debris at air intakes
- before it has a chance to enter the system.
Today more than ever before, mechanical, maintenance and
process engineers are being challenged to provide effective solutions that help
to optimise environmental air quality and process cooling efficiency, while
reducing downtime and maintenance cost.
Regardless of the technology used to process incoming fresh
air, the challenge has always been keeping cooling towers and other HVAC systems
clean. When fresh air is drawn from the outside into HVAC systems, it brings
along with it a wide range of airborne debris that can impact air quality and
quickly clog the system. A clogged HVAC system ultimately leads to downtime for
cleaning and maintenance.
In facilities that rely upon process cooling for robotic
assembly, injection moulding or other production applications, downtime due to
HVAC system fouling is particularly costly because of lost productivity.
Air intake problems are usually seasonal in nature. The
times of year that represent the greatest maintenance challenge are spring,
summer and autumn. Depending upon the season and region of the country,
different environmental factors come into play.
In the spring, nesting birds are frequently problematic
(especially in cooling towers). In areas where spruce trees exist, you can
count on seed being a problem during the summer.
In wetland regions, insects are frequently problematic
during spring and summer and in rural farming areas, leaves, pollen and crop
harvest debris can be problematic during the summer and autumn.
Maintaining good air and water ecology are important
elements in managing healthy and efficient HVAC systems. However, until
recently, most businesses and institutions could do little to improve the
quality of the air before it entered their systems. Hence entry of airborne
debris places greater demand on the HVAC maintenance process.
Unlike traditional internal filter banks used in air
handling units, air intake filters are
installed on HVAC systems at the point where fresh air enters into the system
thus filtering out debris before it can become a problem.
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Air intake filters can also be installed on cooling towers,
air-cooled chillers and condenser units or any fresh air intake opening. Air
intake filtration is specifically designed to stop spruce seed,
pollen, leaves, insects, birds,
paper, construction debris and
other airborne matter from being drawn into air intake openings.
Originally published by Permatron Chicago - Filtration Solutions since 1957
Wednesday 18 March 2015
Air Intake Screens: The problem with free cooling
Air Intake Screens: The problem with free cooling: Is that it relies upon an efficient transmission of air through the fin coils to allow the fans to work at maximum efficiency with the lowes...
Friday 6 March 2015
Small investments, huge savings
The Health Estate Journal recently ran an article under the heading "Small investments, huge savings".
It states that one of the key conclusions from the IHEEM Healthcare Estates 2014 conference was that basic energy efficiency measures could "shave millions of pounds from NHS estates' running costs", and that hospitals and other healthcare buildings face both "an air conditioning legal crisis", and a growing threat from outdoor air pollution.
The whole article is very much worth a read, but one of the key statements is that there is plenty of "low hanging fruit" that any hospital can use to quickly, and cheaply improve energy efficiency.
This last statement is so very true.
Hospitals are a 24/7 operation and have a significant need for cooling which can be found at the heart of most HVAC systems.
In a recent example we surveyed two separate cooling systems at the same facility comprising 1 x Alfa Laval Fin coil unit SCAG-8-5 and 4 x Carrier 09GHCA-178.
The annual energy consumption for these cooling systems totalled 1,618,000 kWh which costs the trust just over £194K per annum to run.
As you can
see from the images below the horizontal coil faces were dirty with compacted
dust, seed, pollen and other debris drawn into the fins.
In a USA
study by Pacific Gas and Electric they identified that 1mm of debris on a coil
fin would cause a 21% drop in efficiency and increase energy consumption by as
much as 30%.
“When a
condenser is dirty or unable to reject heat or energy, heat increases both the
temperature and pressure of the refrigerant liquid line. The higher total
energy, increases the flash gas that decreases system efficiency and capacity” http://www.refrigtech.com/Knowledge_Center/Knowledge_Characteristics_Evaporators.pdf
By installing an air intake filter screen to protect the coil faces, contamination will be significantly reduced as the cooling season progresses.
The air intake screen is manufactured using a polyester core and polypropylene overlay which, during air movement, creates a static charge. This electrostatic charge easily captures the airborne particulate to PreVent® it getting through to the fins.
No airflow, no electrostatic charge and this enables maintenance personnel to easily clean the air intake screens using a vacuum cleaner, hose or brush.
By comparing with similar sites we would expect to see a minimum 10% reduction in running cost as the condenser is kept clean and efficiently rejects heat.
The air intake filter screens were secured to the coil support steelwork using marine grade, nylon drop tab fastenings. In the event that access to the fins is required the screens can be easily removed and replaced.
With an air resistance of only 17 pascals at 3.05m3/s this highly effective external filter will continue to protect the coils for at least 10 years and produce an ROI of less than 12 months.
That leaves the trust with savings of at least £175K over the next 9 years and why we are proud to be saving money for the NHS.
Richard Betts
Managing Director – RAB Specialist Engineers Limited
01635 248633
Monday 16 February 2015
Experts. Are we just experienced or are we experts?
Experts. Are we just experienced or are we experts?
I saw this recent comment from a multi-trade specialist who are able to offer a range of services to the building services market.
Their comment says
"Contact our team of experts today and book your free"..............
I am always concerned when someone offers a free
anything because invariably this WILL end up costing money because someone always ends
up paying for it.
If you are offering to survey a project that requires the installation of anything to anything then how can you realistically cost the job without seeing it? Unless of course you are working to detailed drawings.
One of my ex-employees (Technical
Director) once saw two water tanks. Unfortunately he only
charged the customer for one, so even that doesn't always work.
Anyway let's get back to experts.
The word “expert” is formed from the conjunction of two roots which, phonetically, can be represented as “x” and “spurt”. Everyone knows that “X” is an unknown quantity, and that a “spurt” is what one gets from squeezing a drop of water. Therefore, an expert is an unknown drip under pressure.
Definition: Expert from an article by Jerry
Cates , first published on 24 August 2011
As Jerry says the above definition although amusing is not entirely correct.
Another definition from Brainy Quote suggests
Taught by use, practice, or experience, experienced; having facility of operation or performance from practice; knowing and ready from much practice; clever; skilful; as, an expert surgeon; expert in chess or archery.
However if you look at Wikipedia then:
"In line with the socially constructed view of expertise, expertise can also be understood as a form of power; that is, experts have the ability to influence others as a result of their defined social status. By a similar token, a fear of experts can arise from fear of an intellectual elite's power".
We all seek advice all of the time because let’s face it that is the only way to learn.
If you are selling a safety product then it is easy to influence others based upon
your level of experience.
By carefully wording the proposal you can generate a
fear factor.
Is that being an expert or commercial bullying?
At RAB we offer advice based upon our own
experience and have even stated:
"Technical expertise - the best people for the best service and the best finish"
But, are we truly experts or just very experienced at what we do?
That choice is one that we have to leave to our clients.
Take a look at www.rabse.com
and www.airintakescreen.co.uk
and make your own decision once you have spoken to one of our very experienced
people.
And finally "An expert is a man who has made all the mistakes which can be made, in a narrow field".
Friday 6 February 2015
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