Mitsubishi Hyperheat
What does it have or do that allows it to deliver useful heat down to minus 13F? What do they do to keep the evaporator from icing up more slowly than a conventional heat pump.
I found the following which does not seem to be the whole story:
Perfect comfort to Minus 13 degrees!
Enter Mitsubishi’s new Hyper Heat system. Hyper Heat uses something they call Inverter technology- by using a special phase-changing liquid, they can still withdraw heat from the surrounding environment until temperatures dip below -10.
The best way to think of this is to think of this is to compare it to an ice cream scoop with a heat exchange liquid built in.
The scoop can remain warm enough to easily go through rock-hard ice cream, due to the phase-changing liquid in the handle- a kind of “anti-freeze”. The same principle allows Mitsubishi’s hyper heat system to still extract heat out of the air and warm your home, even when temperatures drop well below the range where most heat pumps simply give up.
Hyper Heat kicks in when the compressor motor is signaled that a burst of heat is required. The motor revs up to max speed and the systems funnels the additional heat thrown off the compressor magnets back to your blower, super charging your heat output and quickly responding to the dropping temperature outside.
Posted Aug 8, 2017, 1:45 PM UTC
It has a liquid bypass that keeps the compressor cool when working in those temps.
The heating coil in the bottom is just to melt ice from the drainpan and keep the coils clear.
The trick is fast and frequent defrosts. It only takes about 20 seconds to unfreeze that coil, and it does it a lot.
Does the compressor tend to overheat when the outside temperature falls? If so, why?
Liquid exiting the condenser (presumably the cassette is the condenser coil in heat mode) is bypassed to where? Approximately what is temperature of the liquid?
Cause its working its ass off, and has a hard time getting refrigerant back to itself.
By passing liquid to the suction side and allowing it to change phase it can keep the compressor cool enough to continue running.
No idea on the more specific questions.