Australian contractor Scantec described the project at ATMO China 2018.
Nis Jensen, Scantec Refrigeration Technologies, addresses ATMOsphere China
Signaling what could be the start of low-charge ammonia system adoption in China, Scantec Refrigeration Technologies has commissioned its first low-charge ammonia industrial refrigeration project for a cold storage facility in the Asian nation.
The facility has a storage capacity of 36,600 m3 and consumes a Specific Energy Consumption (SEC) value of 39 kWh/m3 per year. The latter figure is in line with industry standard best practice according to data sourced from the California Energy Commission, explained Nis Jensen, Scantec, at the ATMOsphere China Conference held in Beijing April 11-12.
Total ammonia inventory is 850 kg and total ammonia operating charge in the evaporators is 5 kg.
“We hope that in the future, low charge ammonia will be better accepted throughout the developing and developed world and eventually make its way into China." - Nis Jensen, Scantec Refrigeration Technologies
According to Jensen, this reduction of ammonia charge was due mainly to several attempts at optimising the system's technology and design. Some of the most significant of these were the absence of NH3 pumps, the use of variable frequency drives, and low-friction stainless steel pipework.
"This all translates to a minimised risk to occupants because of a lower charge in the evaporator," said Jensen.
Additionally, the use of low-charge ammonia contributes to significant energy savings, Jensen explained.
"Switching from liquid overfeed NH3 to low-charge NH3 results in SEC reductions of 15% to 35% depending on plant layout," said Jensen.
"This is a result of the removal of liquid from wet return lines and risers."
The project was done in collaboration with local Chinese contractor Shanghai Fortune Foodstuff Engineering, which provided technical and labor support.
Jensen hopes that this first installation will lead to further inquiries from end users for low-charge ammonia systems.
"We hope that in the future, low-charge ammonia will be better accepted throughout the developing and developed world and eventually make its way further into China."