ScaleAwayTM descaling products are an excellent choice for descaling water formed deposits from evaporative condensers,
shell & tube condensers and centrifugal chillers.
ScaleAwayTM will help rid your equipment of scale deposits and have them working in top efficiency in a matter of hours.
Whenever there is a deposit of any type of heat transfer surface, it retards heat transfer. This is referred to
as “Thermal Resistance” and requires a corresponding increase in energy to overcome it. Major manufacturers of air
conditioning equipment generally design condensers and chiller heat exchangers to operate at maximum thermal resistance
or fouling factor of 0.005. As a result, a deposit of only 1mm corresponds to an increase in energy cost of over 30%.
- ScaleAwaySFA - for Copper coils and tubes
- ScaleAwayMSA - for Aluminium coils and tubes
This 30% increase in cost relates to common calcium carbonate deposit. The actual heat transfer coefficient of a deposit
depends what it is. Iron deposits of the same thickness are greater insulators and therefore have lower heat transfer
coefficients. Certainly any deposit contributing to a fouling factor (thermal resistance) will increase electrical
consumption and decrease efficiency.
The increase in electrical energy takes place in the compressor. Scale deposits will increase the thermal resistance
causing higher refrigerant gas temperatures from the condenser. Higher refrigerant gas temperatures means higher gas
pressures, which require greater energy to compress the refrigerant. Therefore, there is an increase in the electrical
power required to operate the compressor.
Minimising this potential energy loss requires monitoring of the daily energy consumed per ton of refrigerant/air
conditioning being generated. This will allow you to recognise when inefficient operation is increasing due to the
deposit accumulation within your system. Fortunately ScaleAway descalers dissolve the toughest water formed mineral
deposits from virtually any type of water based equipment or system.
Periodic descaling with ScaleAway descalers is necessary for maintaining your equipment at peak operating efficiency and maximum
Evaporative Condensers/Fluid Coolers
An evaporative condenser is designed to condense a refrigerant gas and a fluid cooler cools process water contained on
the inside of the of the units condensing coil or tube bundle. The water is circulated from the basin or sump located
at the bottom of the unit and distributed by spray nozzles to optimize coverage of the condensing coil or tube bundle.
The spray nozzles will distribute water evenly over the condensing coil or tube bundle located in the mid section of
the condenser/cooler. The fan at the top of the unit is used to pull air through the side louvers, enhancing evaporation,
resulting in further cooling of the water during it’s descent back to the sump of the unit.
Scale deposits form on the exterior tube surfaces of the heat exchanger coil, which acts as an insulating barrier.
The ultimate result is inadequate cooling, over worked machinery and expensive inefficient operation. Scale can also
form within the spray nozzles which will reduce coverage of the tube surfaces. A scaled evaporative condenser or
liquid cooler cannot efficiently condense the refrigerant gas in the condensing coil or cool the water inside the
tube bundle. Reduction in efficiency directly relates to added energy consumption and higher energy costs. This
is where ScaleAway’s System Descaling CartTM comes into action! As the ScaleAwayTM descaling solution comes into contact with
the scale deposits, they effectively dissolve them into solution, removing the insulating barrier and re-establishing
the equipment efficiency.
A good cleaning maintenance program with ScaleAwayTM for air conditioning units and water cooling chillers
will increase operating efficiency, reduce energy costs, reduce downtime and provide more reliable performance of the
A dirty chiller will adversely affect operations and require more power (increasing energy costs)
to get the same cooling output as a clean chiller. A dirty chiller system also has to work
harder, which puts excessive strain on the motors and the integral mechanical systems that
include pumps and bearings. The end result, obviously, is a shorter operating life of the system.
Ideally, a facility’s scheduled maintenance program would include chiller cleaning.
The established method of determining the efficiency of the chiller is to monitor the
operating pressures of the system. When pressures begin to increase, particularly head
pressure, it’s an indication that chiller cleaning is necessary.
The removal of waterscale, limescale, sludge and rust from the waterside of your chiller
with scale removers and dispersant is of paramount importance for the efficiency
of your water chillers.
Ask yourself, can I afford not to do a regular descaling with ScaleAwayTM?
Contact us TODAY to purchase these descaling products or to take advantage of our scheduled
preventative maintenance services!
Alternatively, speak to one of our service technicians about acquiring
a ScaleAway’s System Descaling CartTM for your maintenance team to do your own descaling in-house!