[Greenbuilding] Nyle Geyser HPWH - Preliminary Results (was HEAT PUMP WATER HEATER)

[Paul Eldridge]

I'm not sure I follow. You say that 10 kWh are taken away from the 
living space and injected into the water heater.  Check, got it.

And that we require 4.35 kWh of electricity to accomplish this task.  
Roger that.

Now here's where you lose me:  "Much of that 4.35 kWh ends up as heat 
from the machine which might end up back in the living space (or not).  
How much isn't clear, but it seems unlikely it is ALL of it."

OK, if it didn't go into the living space, where exactly did it go?  It 
couldn't have gone into the tank because we've already accounted for 
those 10 kWh.  It seems to me that we're up against that "neither 
created nor destroyed" thing-o-bobby, n'est-ce pas?

So, in the scenario that I described earlier, have I or have I not 
theoretically consumed 6.44 kWh to satisfy that 10 kWh of DHW demand and 
maintained the conditioned space at its set temperature?  If I'm my 
logic is faulty or my calculations are incorrect then, by all means, 
let's set the record straight.

Cheers,
Paul

----- Quote -----

On 10/16/2012 12:44 AM, Paul Eldridge wrote:

>/  Let's say, for argument sake, that our DHW demands are 10.0 kWh a day
/>/  and that our Nyle HPWH has a COP of 2.3.  The Nyle itself will consume
/>/  4.35 kWh, so the balance that is stolen from our conditioned space is
/>/  5.65 kWh.
/
A better way to think about it is, 10 kWh is stolen from your living
space, and compressed into your water heater.  This compression requires
4.35 kWh.  Much of that 4.35 kWh ends up as heat from the machine which
might end up back in the living space (or not).  How much isn't clear,
but it seems unlikely it is ALL of it.


Thank You Kindly,

Corwyn

-- 
Topher Belknap
Green Fret Consulting
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