Ammonia refrigeration system is usually used for big refrigeration projects to provide powerful cooling capacity, like big cold room projects, and brine cooling system for block ice machine (daily output: >20 tons). Via this article, you will know some basic information about this system.
1. Characteristics of ammonia refrigerant system
Freezing point is -77.7 ° C, boiling point is -33.3 ° C
Large volume per unit volume, small specific gravity and viscosity, high heat release coefficient, good heat transfer and low flow resistance
More toxic, with a certain flammability
Liquid ammonia is transparent and colorless, ammonia vapor is colorless and has strong irritating odor
Splashing of ammonia onto the skin can cause swelling or even frostbite
Ammonia has a corrosive effect on copper and copper alloys
Miscible with water at any ratio, but with little solubility in mineral lubricating oils
The free hydrogen separated by ammonia in the system accumulates to a certain extent and explodes in the air.
ODP (Ozone Depletion Potential) =0, GWP (Global Warming Potential)=0;
Cheap price, cheap maintenance;
No oil-return problem
Has a long history
3. No good:
More auxiliary parts, and bigger floor space
Ammonia is toxic and explosive
Usually manual operation;
More refrigerating valves, difficult installation and commission
Higher possibility of faulty operation
4. Safety measurements for ammonia cooling system:
Leakage warning device is needed, and automatically alarm when the liquid ammonia concentration rises.
The ventilation device shall be started when the air concentration in the air reaches the specified value.
Establish a number of specialized fire escape routes.
Operators need special drills.
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