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Absorption heat pump? - Page 3

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Posted by Alex Chiani on February 10, 2008, 6:20 pm

It's not true, an Italian company (Robur) has developed and commercialized a
gas fired absorption heat pump;
the only difference is the "feeding" is natural gas, not more efficient (and
economic) low temperature waste heat, it should be very interesting to
produce a such heat pump consuming only low temp heat like solar thermal or

There is a huge difference : conventional refrigerators use electricity
which is not a primary energy, absorption ones use primary energy sources
like natural gas, if not low temperature waste heat. It takes at least 3
unit of primary energy to produce one unit of electricity, so absorption
heat pumps are so far more efficient than compression refrigerators

Frankly, I coudn't say it's a seriuos thing or not

Even an absorption heat pump/refrigerator use some electricity to feed some
pumps or circuit. Given the fact it doesn't consume primary energy heat, no
surprise at all they define an electrical COP as ratio between heating or
cooling production/electricity consumed. That' s all, ordinary thermal COP
definition is less important in this technology

Posted by Vaughn Simon on February 10, 2008, 6:33 pm

    Or the steam plant of a nuclear submarine...

    I am sitting here in South Florida ready and waiting for solar residential
AC to be perfected.  What a wonderful day that will be!  The hotter the sun, the
more you need your AC, which would be just when it would be working at its best.
Alas, absorption AC units have been around for well over 50 years, and still no
practical residential units on the market.  Fortunately, I have not been holding
my breath.


Posted by Morris Dovey on February 10, 2008, 5:43 pm
 Vaughn Simon wrote:




Interestingly, at least one solution has been around for a long
time. It's a "two-part" solution:

[1] Run a Stirling engine to convert solar (heat) energy to
mechanical energy.

[2] Apply that mechanical energy to a second Stirling engine as a
heat pump to provide the cooling you want.

I've been working on a fluidyne-based version of this scheme, but
still haven't managed to get past [1]. (Glad you're not holding
your breath <g>)

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by Bill Ward on February 10, 2008, 7:06 pm
 On Sun, 10 Feb 2008 09:50:17 +0000, Alex Chiani wrote:

It looks like basically an energy storage system. Here's a link to a
fairly detailed technical description of the operating principles:

Looks interesting for SoCal homes with swimming pools.  Air condition your
home by heating your pool.

I didn't see a price, though.

Posted by Alex Chiani on February 10, 2008, 7:05 pm

The price list is  about 12'000 euros for the 10 kW cooling machine

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