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Low btu / watt window heat pump

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Posted by merlin-7 on October 6, 2007, 6:06 pm
 
 I am looking for the smallest window type, heat pump made for my radio
shack.

 It will be run off of PV to heat / cool a very well insulated 12 x 16 foot
building / radio shack.

 The duty cycle of the unit will be very low as in summer it will be used
mostly to control humidity, while the panels are in full sun and in winter,
to keep the temp above 32f.

 {that is the short description} A lot of data is omitted due to the fact
that I am just looking for the smallest most energy efficient, window type
heat pump made. PV and battery bank size will need to be adjusted at a later
date when (real AH usage can be determined)


Thanks KI4ILb




Posted by Anthony Matonak on October 6, 2007, 7:57 pm
 
merlin-7 wrote:

I'm no expert in these things but I can point out the obvious.

You'll probably do better in the winter to use solar air heating,
perhaps with some form of heat storage, good insulation and maybe
DC powered fans to help circulate air. This will be cheaper and
more efficient than a solar powered heat pump.

This leaves air conditioning. I did a quick websearch on DC powered
air conditioners on google and found a quite a few sites. A sample...

http://www.dcairco.com/index.html
http://www.dcbreeze.com/

It looks like most of these are sold for trucks and RVs.

Anthony

Posted by merlin-7 on October 6, 2007, 9:07 pm
 I like the DC4400 but I see no mention of the price...

360 watts is workable and the low voltage shut off is a plus. Add in a duty
cycle and it can happen, but still it is only an AC unit, not a heat pump
but an option . After all, heat is easy, cooling is not.
 I still like this unit if the price is not to high.

 After all you need to look at the total price of all hardware needed to run
anything...solar panels, battery bank etc. The combination of all the parts,
and the costs of each item dictates your direction.

 In other words, why spend 3k on an item when you can buy an item for $00
( an ac unit for this demo)  and place the other 2.5 grand in updateing
your solar system, and be all the better off...





winter,


Posted by Mauried on October 15, 2007, 8:58 am
 wrote:


I dont know where you are located but this Company sell them but they
arnt cheap.
Around $400.
http://www.sailgb.com/p/12v_air_conditioners/
These 12V air conditioners are expensive because of the small market
size and the specialist type of compressor they use.

It would still be your best option though.


Posted by merlin-7 on October 6, 2007, 9:07 pm
 I like the DC4400 but I see no mention of the price...

360 watts is workable and the low voltage shut off is a plus. Add in a duty
cycle and it can happen, but still it is only an AC unit, not a heat pump
but an option . After all, heat is easy, cooling is not.
 I still like this unit if the price is not to high.

 After all you need to look at the total price of all hardware needed to run
anything...solar panels, battery bank etc. The combination of all the parts,
and the costs of each item dictates your direction.

 In other words, why spend 3k on an item when you can buy an item for $00
( an ac unit for this demo)  and place the other 2.5 grand in updateing
your solar system, and be all the better off...





winter,


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