On Jul 11, 3:57*am, "John Gilmer" wrote:
However, with these portable units (single hose), it's the INSIDE air that
cools the condenser coils, which is in part why their EERs are so
miserable.
BUT, it would appear that this miserable EER cannot be made any MORE
miserable by very high outside temps, since those temps no longer come
into contact with any coil of the unit. *!!!

OK.

Obviously the exhausted air is replaced by outside air. * Ultimately this
air will be cooled to "room temperature" by mixing with the cooled air from
the cooling coil.

One MAJOR loss of efficiency is that the outside air coming is quite humid.
The "condenser" coil doesn't care whether is it cooled by humid or dry air
(at least it doesn't care very much.)
The system makes lemonaide out of lemmons by using the water taken from the
room air to cool (by evaporation) the room air used to cool the "hot side"
of the basic A/C system. * Most window units are set up to do this.

One place where this might be useful would be in an apartment situation.
The replacement air would be drawn in from the hallway which is cooled by
another system.



I wonder if there are some circumstances where this arrangement could
actually be an *advantage*??
Mebbe in 195 F climates?? *

One place where this might be useful would be in an apartment situation.
The replacement air would be drawn in from the hallway which is cooled by
another system.





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Any refrigeration system is a "heat pump". If you want to cool a
whole room it's pointless discharging the heat you have pumped back
into the same room. (There's actually more heat because the
compressor motor is cooled by the refrigerant.)
However there are some stupid devices that do just this. They create a
local cold spot in the room. However the room as a whole will be
heated due to the addition to the room of he compressor heat losses.
Only in America could they be so wasteful of energy.