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If you want to hear it first Join the LRS! Click the box below for this month's report Ron
Unfortunately our planned speaker for tonight was unable to make it at the last minute, but thanks to our brilliant Organising Secretary Brendan, he managed to get Robert Bowden of Mitsubishi to step in at the last minute and give an excellent report on their brand new system.
We were privileged to be the first in the world to hear of this product outside the Mitsubishi organisation. (all the presentation slides were over stamped confidential) so readers hear it first at the LRS!
Rob explained how the new HVRF system which is a hybrid of their VRF system, is a sealed water based hot and cold distribution system to individual Fan Coil units for offices and bedrooms etc.
The external refrigerant based condenser has a maximum of a 11.8 kg refrigerant (plus 0.11g/m over the standard charge and 3kg for the HBC controller) which goes to a “HBC Controller box”, containing a heat exchanger and water pumps which can then supply up to eight water outlets providing controlled heat or cooling to individual areas . This box also contains solenoids, modulating valves, 3 way valves etc, giving total controllable temperatures to the individual areas to be conditioned.
The benefits of this system is that there is greater comfort due to the slower rate of change of the air temperature, the air off temperatures are not as extreme as DX, there is no refrigerant in the occupied areas, there is no refrigerant noise from the fan coils and simplified installation as there are only two water pipes to each fan unit which can be in plastic or copper (no steel can be used), and 2 refrigerant pipes between the HBC controller box and the condenser.
Installation limits are 110m from the condenser to the HBC Box with the condenser up to 50m above or 40m below. Plus up to 60m run from the HBC Box to indoor fan coil unit. The indoor unit sizes are at present limited to 2 kW to 5 kW ducted units, but the range of indoor units will increase in the future.
Defrost times are greatly reduced, with minimal loss of heat output as there is “heat recovery from the water loop, in effect a buffer tank” heat flow temp is up to 45'c with simultanous cooled water at 7 to 13'c
We broke for the usual drop of nourishment, and continued the lively questions and answers from our 15 members present. This was an enjoyable presentation and our thanks to Rob were expressed by all.
These systems will be available in mid-summer from Mitsubishi and more information can be provided by contacting Robert Bowden, Business Development manager of “Living Environmental Systems Division” of MITSUBISHI ELECTRIC via email This email address is being protected from spambots. You need JavaScript enabled to view it. or call Robert on 07912760331