If you are new here you might be asking yourself what is the JEC Combi ??
The JEC Combi is a water-cooled multiple condensing unit for use in the marine environment. It combines all the things you need to install in one neat, self-contained package for a boat in the 45 to 100 foot (14 – 30 m) range, where reliable refrigeration, air-conditioning and freezer needs have to be met. In the case of larger vessels, multiple Combi units can be used. It is capable of delivering 12 to 14kW of refrigeration power per condenser unit or up to 42 kW combined. The Combi unit is extremely compact, eliminating the duplication of motors and pumps inherent in individual installations.
Key Features:
• Rugged construction for high vibration conditions;
• Corrosion protected construction for marine and severe industrial installations;
• Load management technology for high efficiency and minimum peak power needs.
Save on:
• Installation Costs
• Fuel
• Weight
• Space
• Genset Size
• Servicing Costs
To learn more about the COMBI VII system click here
OK! Let’s continue on from Part 3 then..
In the photo below all suction accumulators with transport oil separators are in place together with suction return valves. The valves are designed to separate the system from the evaporative part of the installation. In the case of a leak, it’s easier to determine the leaky part of the system.
In the photo below all the suction accumulators are in place together with the transport separators together with the suction returns valve that can completely close the entire system from the evaporative part of the installation in the case of a leak.
Below all heat exchangers are in place. The rear plate with 4 screws serves as a maintenance lid for cleaning cooling tubes with a long brush from barnacles and thus there’s no need for replacement of other types that are not cleanable.
Below the unit is complete! The COMBI VI system is tested prior to installation with water circulation and overpressure 30Bars and vacuum. It’s left under pressure and vacuumed for 24h each day. When passed the unit is filled with dry nitrogen or argon. It took more than 2 years before this unit was commissioned, typical delay in this type of restoration. When I asked the master installer, Noel Thomas of Cool Factor if the unit was still under pressure both of us were surprised that due to the amount of handling and moving there was no loss of pressure!
In the photo below, the larger box with the Red & Green indicators is a COMBI VII Booster. The function of the equipment is to rectify a single-phase 220VAC/50Hz To 400VDC. This seems to be a simple process however a team of engineers many years ago spent a considerable amount of time to make this process as efficient and safe as possible.
The heart of this process is a very complex, and dedicated integrated circuit that takes care of the rectification via a system called Power Factor Correction (PFC).
In simple terms, the system monitors the 50Hz sign wave in such a manner in order to keep the Power Factor at its optimum thus allowing more useful single-phase power to feed the COMBI VII system. (more bang for buck). In the following articles, JEC will explain how this 400VDC power is used in our own designed and manufactured Brush less motor.
Below in the background the newly installed JEC COMBI is finally mounted into the Margaret Pearl!! – Photo ( Paul Jindra ) Thanks for joining us for part 3 of the Margaret Pearl COMBI VII installation story – If you have any questions or are interested in getting in touch, don’t hesitate and reach out via our contact form below
By Paul Jindra – Director JEC Marine.
Around 4 years ago I received a call to come to Queensciff in order to provide a solution to this 17m vessel that was under reconstruction.
The Brief was as follows:
- Two Large refrigeration and fridge eutectic boxes with rapid freezing capability.
- 4 Air condition evaporators working from one condenser.
- 180I/h desalination system
- High-pressure Deck wash.
- The power sources: AC single phase 15A max shore power only.
- Hydraulic power from a propulsion engine is available only under steam.
- PTO output for ancillary compressor from a power splitter mounted on the engine.
- No ancillary generator.
Our recommendation:- The JEC COMBI VII system!
My first concern was to find a suitable place for the COMBI system considering the number of additional components that will fill the entire engine room. I was very sceptical about the project knowing how long it will take and with my decades of experience in the industry (70% finished and 80% to go) I started to wonder if JEC should be involved. After meeting with James (crew calls him Jim) Woods I was convinced of his determination to finish this project. So I jumped on board.
I had requested to see the Yanmar Engine in order to see how our engine-driven PTO compressor would fit. It was a beast, somewhat oversized and it was clear to me that the installation would be very tight. Nevertheless, I settled on the STB side, where the blue straps and the knot hit the border of the picture.
As soon as the specifications were agreed upon JEC started the production of the COMBI VII
As they say “a picture paints a thousand words!
Base Plate with Draining tubes that collects all the condensation and stops water dripping all over the vessel. Along with Anti – Vibration mounting feet.
Every component on the COMBI VII is made out of 5083 Marine grade Aluminium hard anodised and sealed with dichromate, thus eliminating corrosion for decades.
400VDC 5 kW brush-less motor 2500rpm 100% duty cycle. Powering the COMBI from single phase 220VAC via a PFC booster. Standard Protection on all parts SS 316 shaft with SS bearing.
Front Frame with all the compressors, pump and pulleys are mounted.
The front plate is mounted with the motor and the suction accumulators are placed in position sitting on insulation saddles for better drainage or condensation. Note the drainage groves with collecting outlets the vessel moves in all directions. The holes will collect the drainage in 4 corners of the base plate.
The Combi has 3 complete condensers but only 2 compressors in this assembly as the 3rd compressor is mounted via PTO directly on the engine. The blue part in the middle is the hydraulic motor and the light blue bottom left is the high-pressure CAT pump for desalination and deck wash.
The white vessel is a water-cooled condenser liquid accumulator connected to the Gray manifold that distributes the raw water to 3 vessels White, Yellow, and Green for better identification.
The small vertical cylinders transport oil separators continuously feeding oil to the compressors under the vessel’s movements in the sea.
To view the full COMBI VII product specification click here
Thanks for joining us for part 2 of the Margaret Pearl COMBI VII installation story – If you have any questions or are interested in getting in touch, dont hesitate and reach out via our contact form below
Over the New Years Break we enjoyed this gift box containing fine delicacies from one of our larger customers. The card reads “Thank-you for the quality of service you continue to provide to us. We sincerely appreciate your efficient, gracious customer service, the level of detail and accountability you have demonstrated on each project, and the way you conduct business as a whole. From Brad and the team at Marine Air Flow” International.
For Highest Quality Marine Pumps and highly recommended after sales support contact JEC Marine Today!!
Selling high quality marine pumps without excellent after sales support is not the way JEC Marine does business, see for yourself what our happy customers are saying :: Brady Doak from Leigh Marine Laboratory, University of Auckland.
For Highest Quality Marine Pumps and highly recommended after sales support contact JEC Marine Today!!