Aqua-Air Manufacturing is proud to have been chosen to supply a new 160 ton (1,920,000 BTU/H) two stage screw compressor chiller unit for the Silversea Expeditions “Silver Galapagos” Expedition Ship that operates in the Galapagos Islands. Features of the unit are:
Dual 80 Ton Ton R-407C Bitzer Screw Compressors with 4 Stage Unloading
Shell and Tube Marine Seawater Condensers
Brazed Plate Evaporator with One Chillwater Circuit & Dual Refrigerant Circuits
Electronic Expansion Valves for precise refrigerant metering
Replaceable Core Liquid Line Filter Drier
PLC Actuated Modulating Butterfly Valves for automatic seawater flow regulation
Full Pressure & Temperature Monitoring of all functions on the unit
The OM160-2GE Chiller Unit is 100” long x 72” wide x 72” high and weighs approximately 6400 lbs. The Bitzer Screw Compressors are mounted at an angle to assure oil return under all sea conditions.
This particular unit is very unique in that it was designed from the very beginning with the concept in mind that the entire unit must be able to be disassembled and carried through a door 36” x 78”. This was accomplished by a significant amount of planning in the design phase. The unit was designed entirely in SolidWorks 3D Software which allowed us to visualize the unit from all angles and create the best possible unit for the space provided. The OM160-2GE is replacing two existing Carrier units that occupied 50% more space than this unit.
Another unique feature is how seawater is distributed to the seawater condensers. Seawater from a centralized ships source is regulated to each Shell & Tube Condenser through the use of 4-20mA input Modulating Butterfly Valves. An Aqua-Air PLC with Touchscreen Interface monitors the individual compressor discharge pressures through the use of refrigerant pressure transducers and controls the inlet and bypass water regulating valves for each condenser. Discharge pressure is maintained at a perfect 225 psig under all seawater temperature conditions.
A copy of the OM160-2GE specification is attached for your reference.
This page was last updated: November 28, 2017