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Project
selected , which also offers a better co-efficient of performance ( COP ) rating and has a GWP ( Global Warming Potential ) of 0 , compared to the GWP of R410a of 2 088 .
The NH 3 refrigeration system consists of two circuits which each have a brace plate heat exchanger , Mycom compressor , 75kW Motorelli compressor motor and a 11kW circulation pump . Each system can supply 300kW at -8 ° C suction temperature .
Mycom compressors are widely used in industrial refrigeration . The variable speed control for compressor motors and circulation pumps allows for better energy efficiency and control over temperature variations during production .
The advantages of using ammonia as a refrigerant include :
• its environmentally friendly nature
• GWP of 0
• better COP rating
• good thermodynamic properties
Coldfact , as the main contractor , oversaw the entire installation , while each subcontractor specialised in specific aspects like the design , refrigeration system , evaporative condenser , control system and more .
Safety measures often include leak detection systems and proper ventilation , given ammonia ' s potential hazards .
The compressor motors and circulation pumps are variablespeed controlled to allow for efficient suction temperature and constant control of the water temperatures during peak loads during production .
A Baltimore Air Coil ( BAC ) evaporative condenser with stainless steel tubes , was installed for the heat rejection and compressor head cooling . Water treatment was installed to prolong the life expectancy of the evaporative condenser . BAC evaporative condensers are known for their efficiency in heat rejection . Stainless steel tubes are likely chosen for their corrosion resistance , ensuring durability in the condenser .
The critical charged installation is operating with 205kg of NH 3
Signal Hill Products – Skid & Pipe Layout .
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RACA Journal I March 2024 www . refrigerationandaircon . co . za