CHILLED WATER, DX (EVAPORATOR) COILS & MOISTURE CARRYOVER
by Engineer Hilal, Oct 11, 2020
Moisture carryover is present on DX (Evaporator) Coils or Chilled Water coils where dehumidification happens. Many people do not think it’s a problem…until you have moisture running down ductwork or spewing all over the inside of an air handler. If you’ve ever experienced that then you probably know all of these rules regarding moisture carryover.
·
MARCOOL Coil does not typically build
chilled water or DX (Evaporator) Coils over 50”. For example, with applications that call
for a 96” high coil, we will build (2) 48” high coils and stack them with an
intermediate drain pain. We do this for a couple reasons: first, the
shipping & handling is far easier and there’s less chance for damage before
the coil even gets to the job-site. Second, the drain pan in the bottom of the
unit for a 96” high coil would be enormous, and it would be practically
“raining” off the top of a coil 96” high.
·
Air velocity for Chilled Water or DX
(Evaporator) Coils should never be higher than 550 feet/min!!! Anything higher and
you are asking for complications. You’d be surprised how many manufacturers
won’t tell you that to keep you out of trouble.
·
Entering air temperatures of 80/67 of
return air in the Northeast carry far less moisture than an outside 95/78
entering air temperature in Jeddah. Outside air always has more moisture. Your
location plays a part as well. The drain pans will absolutely have be sized
differently. Jeddah will be much larger in size.
·
Fin design is irrelevant when it comes to
moisture carryover. Whether you have copper corrugated fins, or aluminum flat
fins, plate fins or even the old fashioned spiral fins, none of it has any
effect on moisture carryover.
·
Lastly, be careful when installing a new
chilled water or DX (Evaporator) Coils in a system. Many end users like to
increase the airflow on older coils because those old coils can act like
filters, the fins are covered in dirt/dust and you’re not getting the same
airflow through the coil. This dirt on the coil also semi-prevents moisture
carryover. When that brand new chilled water coil is installed, the airflow
might be higher than that 550 ft/minute and that, of course, will cause
moisture carryover problems.
Please give us a call
with any questions about your coil, your system or its design. MARCOOL factory is
unparalleled in the industry!
Order now high quality evaporator coils with warranty..from Marcool Cooling Systems Factory
The MARCOOL® plant offers sustainable solutions for air conditioning and heating systems
for commercial buildings, industrial facilities and power plants, as well as centralized cooling facilities. The factory offers a full range of products that can meet the requirements of heating, ventilation and air conditioning for all customers in the commercial and industrial sectors throughout the Kingdom of Saudi Arabia.
These products include heat exchangers, condensers, evaporators, coolers, coils, air ducts, and chiller's air conditioning tubes.
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 COILS & MOISTURE CARRYOVER by Engineer Hilal, Oct 11, 2020 Moisture carryover is present on …){kind=link}
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