[Greenbuilding] heat pump tech

[John Salmen]

I want to switch this thread to heat pumps in general. The basic question is
why don't we see more small pump applications out there and why does this
one even exist?

Paul invested in one of the best products out there that I am actually
surprised is still around. 
Nyle developed the product at a point where the US was actually providing
rebates for products that made them affordable depending on state rebates.?.
Based on that and a nerd sensibility in small companies that had faith in
governance -  Nyle and a few other small companies wasted time developing
products for a market that did not emerge. 

 I think about 2-3 other companies produced comparable add-on products
(small air to water heat pumps or small heat pumps that could be attached to
a domestic water heater). I think 2 large companies produced an integrated
tank and heat pump and they may still be out there. The product is basically
not supported.

When I researched it the nyle was my product of choice but that is an
anecdotal choice based on conversations with the people that designed it -
small company with good people on air skills looking to diverse. 

The thing was is that a heat pump addon to a hot water heater could save
money for a large laundry family but why would that family spend an extra 1k
on that when they can barely afford the house as a shell?

We need continued subsidized programs that continue to inspire and support
the companies out there that go beyond the basic marketplace.



-----Original Message-----
From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
On Behalf Of Paul Eldridge
Sent: October-15-12 9:44 PM
To: greenbuilding at lists.bioenergylists.org
Subject: [Greenbuilding] Nyle Geyser HPWH - Preliminary Results (was HEAT
PUMP WATER HEATER)

With a conventional electric water heater, every kWh of water heating demand
represents a kWh of electricity demand, so the ratio is one to one; no
surprise there.  Our home's space heating requirements are met by two high
efficiency ductless heat pumps, both with a seasonal COP of 2.7, so the heat
that we sacrifice to our Nyle HPWH will have been provided to us at one-half
to one-third the cost of fuel oil or electric resistance.

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.  Our ductless heat pumps will theoretically use 2.09 kWh to
replace the 5.65 kWh taken away, and so if we add the two together, the
combined total is 6.44 kWh.  Thus, even during the winter months, the net
operating costs of our Nyle HPWH are roughly one-third less than that of a
standard electric water heater and it will continue to do double duty as a
dehumidifier (our dehumidifier at 550-watts is one of our home's major power
guzzlers and anything that we can do to minimize its usage is a good thing).

If you heat your home with wood, natural gas or a heat pump, or if your
passive solar gains typically exceed your space heating requirements then,
presumably, you're well ahead of the curve; even for those with electric
heat, it's basically a wash..

Cheers,
Paul


----- Quote -----


Please keep in mind that an ASHPWH WILL raise the heat load and the annual
heating demand of homes in heating climates if placed with in the thermal
envelope. The amount of the increase will be proportionate to the tightness
and U value of the envelope. The tighter the house and the less conductive
the assembly, the greater the increase in heating demand will be. The
by-product of hot water is cold air.

c

*Christian Corson*
*EcoCor Design/Build*
ecocor.us
chris at ecocor.us
207 930-5088


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