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Refrigeration presentation
 

Refrigeration presentation

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Refrigeration presentation Refrigeration presentation Presentation Transcript

  • Ammonia RefrigerationBy Matt G. & Hamish B.
  • AmmoniaDiscovered centuries ago, Ammonia’s uses areplentiful.Colourless, but omits a pungent odour hard toignore.Combined with specific materials in chemicalssuch as bleach to form a highly toxic ChlorineGas.
  • Ammonia inRefrigerationWith an Ozone Depletion Potential (ODP) of ZERO,Ammonia is a practical and efficient refrigerantprimarily used in commercial applications.Ammonia refrigeration systems usually workunder large tonnages.The following are some examples of someapplications one would find in a commerciallyoperated, 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 ReciprocatingCompressorModel: N6B6 Cylinder480 V; 125 HP; Single StageBelt DrivenWith a compression-ratio of 4.64:1Sweet.
  • 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 thetemperatures of Calcium Chloride to be used tofreeze the Ice for the hockey rink.Calcium Chloride is used because it has agreater 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 itin the Refrigeration industry. Thanks for watching“This is horse-shit.” -Matt Matthews