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Ammonia Refrigeration
By Matt G. & Hamish B.
Ammonia
Discovered centuries ago, Ammonia’s uses are
plentiful.

Colourless, but omits a pungent odour hard to
ignore.

Combined with specific materials in chemicals
such as bleach to form a highly toxic Chlorine
Gas.
Ammonia in
Refrigeration
With an Ozone Depletion Potential (ODP) of ZERO,
Ammonia is a practical and efficient refrigerant
primarily used in commercial applications.

Ammonia refrigeration systems usually work
under large tonnages.

The following are some examples of some
applications one would find in a commercially
operated, Ammonia-based system:
Evaporative Condenser
 •
     Water is cooled by the evaporative cooling
     and rejects the heat into the atmosphere.
 •
     Condenses the high-pressure, high-temp.
     vapour by spraying water over the tubes.
     Fans pulls the ambient air over the coils to
     help assist in the condensing process.
 •
     The ‘evaporation’ comes from the heat being
     absorbed by the water being sprayed over the
     coils. The resulting vapour is released,
     disposing heat from the system.
 •
     As the water is evaporated it is replaced
     with a makeup system using a float.
Evaporative Condenser
(Cont.)
 •
     In prevention of mineral deposits, as the
     water’s minerals build up during evaporation,
     the condensate needs to be able to escape
     the system and be replaced with fresh water.
 •
     Use wet-bulb temperature to drive the
     condensation process.
 •
     Approx. 3 gal/min of water is evaporated for
     every 100-tons of refrigerant.
MYCOM Reciprocating
Compressor
Model: N6B

6 Cylinder

480 V; 125 HP; Single Stage

Belt Driven

With a compression-ratio of 4.64:1

Sweet.
Reciprocating Comp.
(Cont.)
• Gas tested @ 313 PSIG, 130 F (high side) and 185 PSIG, 96 F
  (low side).
• Water tested at 470 PSIG (high side), and 470 PSIG (low
  side).
• Running pressures – High side @ 151 PSIG. Low side @ 21
  PSIG.
• The Compressor is considered the heart of the refrigeration
  system. A compressor turns low-pressure, low-temperature
  vapour into high-pressure, high-temperature vapour, which
  is then sent out to the Condenser.
• This compressor has water-cooled head gaskets to keep it from
  overheating.
• In some systems (like ice rinks) the excess heat transfers to
  the coolant - such as ‘Glycol’ - to heat the surfaces
  underneath the ice.
Brine Chiller

(Abbotsford Arena) Used to lower the
temperatures of Calcium Chloride to be used to
freeze the Ice for the hockey rink.

Calcium Chloride is used because it has a
greater heat-transfer-coefficient than Glycol.
Brine Chiller (Cont.)
• ‘Shell-and-Coil’ are used when specific temperature
  ranges need to be maintained.
• Abbotsford Arena’s Calcium Chloride was running
  at 27% by weight which becomes crystallized at
  -22 F, and has a PG of 1.25
• The Brine is sent from, and circulated through by
  pumps.
• The Brine is chilled by the evaporative refrigerant
  in the flooded evaporator containing the Brine
  Tubes.
• Calcium chloride has a S.G. of 1.3. The PH levels
  should be above 7.
• The Brine chiller has an electric heater which will
  heat the calcium chloride when it is in need of a
  quick defrost of the ice rink’s surface.
Ammonia. Not Bad.

As there are plenty of logical uses for NH3
(excluding its ingestion), there are many uses for it
in the Refrigeration industry. Thanks for watching

“This is horse-shit.” -Matt Matthews

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Refrigeration presentation

  • 2. Ammonia Discovered centuries ago, Ammonia’s uses are plentiful. Colourless, but omits a pungent odour hard to ignore. Combined with specific materials in chemicals such as bleach to form a highly toxic Chlorine Gas.
  • 3. Ammonia in Refrigeration With an Ozone Depletion Potential (ODP) of ZERO, Ammonia is a practical and efficient refrigerant primarily used in commercial applications. Ammonia refrigeration systems usually work under large tonnages. The following are some examples of some applications one would find in a commercially operated, Ammonia-based system:
  • 4. Evaporative Condenser • Water is cooled by the evaporative cooling and rejects the heat into the atmosphere. • Condenses the high-pressure, high-temp. vapour by spraying water over the tubes. Fans pulls the ambient air over the coils to help assist in the condensing process. • The ‘evaporation’ comes from the heat being absorbed by the water being sprayed over the coils. The resulting vapour is released, disposing heat from the system. • As the water is evaporated it is replaced with a makeup system using a float.
  • 5. Evaporative Condenser (Cont.) • In prevention of mineral deposits, as the water’s minerals build up during evaporation, the condensate needs to be able to escape the system and be replaced with fresh water. • Use wet-bulb temperature to drive the condensation process. • Approx. 3 gal/min of water is evaporated for every 100-tons of refrigerant.
  • 6. MYCOM Reciprocating Compressor Model: N6B 6 Cylinder 480 V; 125 HP; Single Stage Belt Driven With a compression-ratio of 4.64:1 Sweet.
  • 7. Reciprocating Comp. (Cont.) • Gas tested @ 313 PSIG, 130 F (high side) and 185 PSIG, 96 F (low side). • Water tested at 470 PSIG (high side), and 470 PSIG (low side). • Running pressures – High side @ 151 PSIG. Low side @ 21 PSIG. • The Compressor is considered the heart of the refrigeration system. A compressor turns low-pressure, low-temperature vapour into high-pressure, high-temperature vapour, which is then sent out to the Condenser. • This compressor has water-cooled head gaskets to keep it from overheating. • In some systems (like ice rinks) the excess heat transfers to the coolant - such as ‘Glycol’ - to heat the surfaces underneath the ice.
  • 8. Brine Chiller (Abbotsford Arena) Used to lower the temperatures of Calcium Chloride to be used to freeze the Ice for the hockey rink. Calcium Chloride is used because it has a greater heat-transfer-coefficient than Glycol.
  • 9. Brine Chiller (Cont.) • ‘Shell-and-Coil’ are used when specific temperature ranges need to be maintained. • Abbotsford Arena’s Calcium Chloride was running at 27% by weight which becomes crystallized at -22 F, and has a PG of 1.25 • The Brine is sent from, and circulated through by pumps. • The Brine is chilled by the evaporative refrigerant in the flooded evaporator containing the Brine Tubes. • Calcium chloride has a S.G. of 1.3. The PH levels should be above 7. • The Brine chiller has an electric heater which will heat the calcium chloride when it is in need of a quick defrost of the ice rink’s surface.
  • 10. Ammonia. Not Bad. As there are plenty of logical uses for NH3 (excluding its ingestion), there are many uses for it in the Refrigeration industry. Thanks for watching “This is horse-shit.” -Matt Matthews

Notas do Editor

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