Gary Schiltz wrote:
Amusing indeed (the PV magazine article). The pump “reportedly
produces 3 kW to 4 kW of heat for every kilowatt of power it
consumes”. Say what?
this is just the typical way that a "heat pump" works, not by creating
the energy in the power, just by concentrating it... ejecting
warmer/cooler air/water on the opposite side of the system...
The wider range of air-source functioning: -15 to 50C and being
hydromechanically suitable for liquid-sourcing (e.g. run water through a
pipe buried in the ground, or ground-water being pumped for irrigation)
makes it yet more suitable.
First glance on the article suggests a better duty cycle with(out) the
kinds of moving/friction parts compressors come with (conventional
heat-pump)...
I don't know much about the environmental or practical implications of
using Helium as a working fluid... huge molecular size compared to H,
but a fraction of most other working gasses?
The 3-4/1 coefficient of performance implied by the article numbers is
roughly 10-14EER or 12-17SEER to compare with commercial
HVAC/Mini-Split numbers... so in the same general range?
I've never looked hard, but have been curious about an
ammonia-working-fluid heat-source refrigeration system (usually used as
an off-grid/RV Propane fridge). Seems like concentrated solar-thermal
driving refrigeration (or heat pumping in reverse?) would be pretty
elegant? Ammonia as a working fluid also seems lower-industrial and
presumably more environmental than it's more industrial cousins? I knew
people growing up who lived without electric service who had these funny
looking refrigerators which had a pilot-light-sized flame in the back
that "made them cool"... from a propane tank... crazy talk I thought then!
On Fri, Jan 6, 2023 at 8:28 AM Roger Critchlow <r...@elf.org> wrote:
I was amused to see an announcement of a thermoacoustic heat pump the other
day:
https://www.pv-magazine.com/2023/01/02/residential-thermo-acoustic-heat-pump-produces-water-up-to-80-c/
then an ionocaloric refrigerator announcement turns up this morning
https://newscenter.lbl.gov/2023/01/03/cool-new-method-of-refrigeration/
It seems that you won't recognize your air conditioner in a few years.
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