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Technology

Azane’s packaged outdoor ammonia chillers are inherently safe, energy efficient and use no water.” - Caleb Nelson, Azane

WATER AS A REFRIGERANT efficient energy, a German firm, has developed an eChiller centrifugal chiller that uses water as a refrigerant. In a process cooling case study involving the condensing of a solvent, the eChiller provides a constant flow of chilled water at 64°F without temperature deviation, said Juergen Suess, managing director, efficient energy. The process, which operates in a near-vacuum (.16 to 2.3 psi), includes 68% free cooling and 32% compressor cooling, depending on ambient temperature. It provides up to 20 kW of capacity. The company has installed 20 eChillers, expected to grow to 30-40 by the end of the year.

SCE has calculated an energy incentive of about $85,000; the facility is expected to save $1.4 million in energy costs over five years compared to a traditional system, and will pay for itself in 6-7 years, said Scherer.

Ammonia/CO 2 installations Leading Mexican cold-storage operator Frialsa expanded a facility in Culiacán, Mexico, with a cold-storage room (350 TR), frozen storage room (130 TR) and blast freezing (71 TR). Frialsa uses an ammonia/CO 2 cascade system at other plants. (See Ammonia/CO 2 South of the Border,” Accelerate America, April 2017.) But here the company installed an ammonia/glycol chiller on the roof that supplies glycol inside the building to condense a low-temperature CO 2 DX system and a medium-temperature pumped CO 2 system. The total ammonia charge is about 1 lb/TR. Because this system is using secondary glycol, “there is no chance of an ammonia-CO 2 interaction,” said Ely Espinosa, with Bohn De Mexico, who presented with Javier Atencia, chief technical officer, Tewis. When CO 2 and ammonia combine in a cascade condenser, the result is ammonium carbamate, a salt that can clog the system. For a new Flanagan Foodservice cold-storage plant in Ontario, Canada, CIMCO Refrigeration proposed three refrigeration alternatives: all-ammonia, ammonia/CO 2 cascade (with recirculated CO 2 , not DX), and transcritical CO 2 . “We were trying to find the solution that matched the customer’s requirements,” said Benoit Rodier, director of business development, CIMCO.

John Scherer, NXTCOLD

NXTCOLD unit at LA Cold Storage

Ammonia/CO 2 also was chosen for the new plant because of its lower total cost of ownership (TCO). Energy costs were the biggest contributor to the TCO. “Some customers are capable of understanding TCO while most of the others have limited knowledge and are the hostage of some consultants and contractors still promoting lower-initialcost Freon systems,” said Rodier MG

In another facility in Ontario, Flanagan had installed the very first low-chargeammonia and recirculated brine CO 2 NewTon system for its freezer operation. “It has been running for a few years now with excellent results and performance,” said Rodier.

Accelerate America 

  August 2017

Accelerate America #27, August 2017  

The Facilitator: Source Refrigeration’s pivotal role in the transition to natural refrigerants