BentleyJ
Solar Wizard
Found this on YouTube regarding multi-cascading heat pump technology for extended temperature range operation.
Flooid Cascading Heat Pumps
- Thread starter BentleyJ
- Start date
Nobodybusiness
Solar Sponge.
Saw this also but I don’t think they are in production yet.
Still waiting on certification and test results or something.
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Also saw it and thought, "Multiple pumps, and they have no money to get this certified. They need to sell out to someone." Then I saw that they're using all off-the-shelf parts and I thought, "Hmmm... Any real IP there?"
I dunno... Seems like a nice topic for a YouTube guy to do a video, but I'm not holding my breath waiting for these to make it to the local HVAC wholesaler anytime soon. Personally, I just want Mitsubishi to release air to water equipment to the US market at a reasonable price, and I can call it a day.
I dunno... Seems like a nice topic for a YouTube guy to do a video, but I'm not holding my breath waiting for these to make it to the local HVAC wholesaler anytime soon. Personally, I just want Mitsubishi to release air to water equipment to the US market at a reasonable price, and I can call it a day.
wpns
Solar Joules are catch and release
Can’t seem to wrap my brain around how an outdoor unit with a particular temperature range cascaded with another unit is going to work when you are no longer in the temperature range of the outdoor unit.
BentleyJ
Solar Wizard
Its because each stage uses refrigerants with different boiling points. The first stage and second stage could be linked via an insulated heat exchanger such that outdoor ambient temp would not be a significant factor.
While cascade heat pumps are not new, these guys are claiming to be able to blend from mode(?) or some sorts to offer good low ambient (2 COP) while maintaining high ambient efficiency (4 COP).
I'm guessing they have a bypass mode for the lower temp loop.
I'm actually working on a cascade diy heat pump that pulls heat from the freezer and dumps to a pre hot water tank. I plan on R290 for the low temp and R600a for the high temp
I'm guessing they have a bypass mode for the lower temp loop.
I'm actually working on a cascade diy heat pump that pulls heat from the freezer and dumps to a pre hot water tank. I plan on R290 for the low temp and R600a for the high temp
And they've been used in industry for a long time already:
But yeah, COP is limited. I personally don't really see the need of over-complicating these things when in residential use. The primary solution to make people comfortable with a heat pump is building insulation. Works fine here in the Nordics.
But yeah, COP is limited. I personally don't really see the need of over-complicating these things when in residential use. The primary solution to make people comfortable with a heat pump is building insulation. Works fine here in the Nordics.
