On Wednesday, June 22, 2016 7:58PM, Jim Thompson   
    wrote:   
      
   >On Wed, 22 Jun 2016 20:43:33 -0500, Tim Wescott    
   >wrote:   
   >   
   >>On Wed, 22 Jun 2016 16:47:45 -0700, Jim Thompson wrote:   
   >>   
   >>> On Wed, 22 Jun 2016 18:41:59 -0500, Tim Wescott   
   >>>  wrote:   
   >>>   
   >>>>On Wed, 22 Jun 2016 16:14:18 -0700, Bret Cahill wrote:   
   >>>>   
   >>>>> 90% of the electric bill in the desert at this time of the year is   
   >>>>> HVAC.   
   >>>>>  The rest of the house doesn't need so much power and only requires a   
   >>>>> small low cost battery for night time.   
   >>>>>   
   >>>>> Freeze about 2 tons of water during the day and then sink heat into   
   >>>>> the ice at night.    Maybe 2/3rds of the solar power goes to running   
   >>>>> the conventional AC or heat pump during the day and 1/4 goes to   
   >>>>> freezing water for evening and night time cooling.   
   >>>>>   
   >>>>> Load level with the freezer unit and the much smaller battery.  When   
   >>>>> the power from the PV is temporarily reduced by clouds the freezer   
   >>>>> unit would cut off while the heat pump would remain running.  The   
   >>>>> clouds should cool things off anyway.   
   >>>>>   
   >>>>> In winter the heat pump would melt a tank of paraffin for night time   
   >>>>> heating.   
   >>>>>   
   >>>>>   
   >>>>> Bret Cahill   
   >>>>   
   >>>>Sounds good.  You got room for that much water?  IIRC, there's energy   
   >>>>losses involved in pushing a given amount of heat farther than it   
   >>>>'needs' to be -- so it may be more efficient to find a substance that   
   >>>>freezes at 60 degrees F or so, is cheap, easy to handle, has a   
   >>>>significant heat of fusion, and isn't something that would turn the   
   >>>>entire neighborhood into a superfund site if the tank leaks.  Maybe some   
   >>>>other wax, from the same place you're getting your 80-degree (or 100   
   >>>>degree, or whatever) paraffin.   
   >>>>   
   >>>>Note that I managed to dodge taking thermodynamics in school -- so go do   
   >>>>your own math on this.   
   >>>   
   >>> If it was a good idea someone would be already doing it.  Daytime power   
   >>> is at ON-Peak rates.  You'd be better off to use night-time OFF-peak   
   >>> rates to freeze some ice for you to sit on during the daytime ;-)   
   >>>   
   >>> Since I'm now chief cook and bottle-washer while my wife recuperates   
   >>> from 5 hours of back surgery, I do all clothes and dish-washing in the   
   >>> early morning... (summer) ON-Peak here is 1PM to 9PM.   
   >>>   
   >>>                                         ...Jim Thompson   
   >>   
   >>I think Bret was thinking of off-grid stuff.   
   >>   
   >>But yes, freeze over night, melt during the day if that's what's   
   >>favorable.   
   >>   
   >>Do they buy energy back during on-peak at on-peak pricing?   
   >   
   >I don't do solar... solar is for fairies >:-}   
      
   Just google 'shopping' and 'solar air conditioner'.   
      
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