35
W W W . B A L T I M O R E A I R C O I L . C O M . A U
M A R 2 1 0 - 2
Coil Freeze Protection
For protection against coil freeze-up, recommended solutions are an
industrial grade inhibited ethylene glycol or propylene glycol solution.
When the use of glycol is not practical, the system must be designed
to meet both minimum ow and minimum temperature requirements.
Minimum Operation
• When a glycol solution is not utilized on an application utilizing water
as the process uid, operate the system to meet minimum ow and
temperature requirements.
• Maintain a minimum heat load so that the temperature of the uid
leaving the coil is not less than 10°C. For RCF Closed Circuit
Cooling Towers with glycol as the heat transfer liquid, maintain a
minimum heat load so that the temperature of the glycol leaving the
coil is not less than 7.2°C.
• To maintain the leaving uid temperature at 10°C when the
process load is extremely light or shut off, apply an auxiliary heat load
to the circulating uid and adjust the ow to ensure that uid
leaving the coil maintains the minimum required temperature.
Emergency Coil Drain (RCF Only)
Do not drain the coil as a normal method of freeze protection. Frequent
draining promotes corrosion inside the coil tube. However, draining
is acceptable as an emergency method of freeze protection if the coil
is not protected by a glycol solution. If the coil is not protected, an
automatic drain valve and vacuum breaker are recommended to drain
the coil if ow stops or the uid temperature drops below 10°C when
the ambient temperature is below freezing. Further protection against
coil freeze-up is possible with the installation of an alarm to alert
personnel when the temperature of the uid leaving the coil falls below
10°C. Contact your local BAC Representative for guidelines on the
installation of an emergency coil drain system.
Cold Weather Operation
Fan Section Icing Protection
Fan Control (cont)
Dry Operation
Basin Water and Internal Piping Freeze
Cold Water Basin Protection
Coil Freeze Protection
Minimum Operation
Emergency Coil Drain
To Next Page
Loading...