Honda cogen unit

[Gordon Reeder]

Probably the case. Although it will not reheat water that quickly, not
a 25kW gas boiler for sure. Having some switching arrangement to also
heat an electric immersion water heater would be handy to use all its
power in the home. When calling for hot water it seems senseless to
feed electricity into the grid.

What kind of water heating would you get from it. Electricity
I understand, but how do you convert KWH to water temperature?
Say I had a 50 gallon tank of water, much heating would I get
with that Honda Co-gen unit (IIRC it was 3.5KWH of heat)?


--
Just my $0.02 worth. Hope it helps
Gordon Reeder
greeder
at: myself.com

Where is George Bush leading this country
and what are we doing in this hand basket??

 

[[email protected]]

What kind of water heating would you get from it. Electricity
I understand, but how do you convert KWH to water temperature?

....3 kW is 10.2K Btu/h of of water heating, and 1 Btu can heat
1 pound of water 1 F.

Say I had a 50 gallon tank of water, much heating would I get...

....50 gallons is 417 lb of water. You might heat it from 60 to 110 F
in about 417(110-60)/(10.2K Btu/h) = 2 hours.

Nick

 

[m Ransley]

I believe the water heating mode is circulated water through the
Cogenerator. The heat is removed from the exaust and motor as it is
cooling the motor, through a heat exchanger. You would only need an
insulated storage tank and probably would get all your hot water needs
free. It could also be hooked up to radiators to heat your house, if
heating was your main need.

A gas tankless like Bosch or Takagi could make up any additional hot
water you need for showering etc Bosch make 2 units that have no gas
pilot and need no outside source of electricity for gas ignition. One
uses 2 d batteries, which I have, and one has a mini hydro turbine
generator built in.

 

[Bughunter]

I believe the water heating mode is circulated water through the
Cogenerator. The heat is removed from the exaust and motor as it is
cooling the motor, through a heat exchanger. You would only need an
insulated storage tank and probably would get all your hot water needs
free. It could also be hooked up to radiators to heat your house, if
heating was your main need.

A gas tankless like Bosch or Takagi could make up any additional hot
water you need for showering etc Bosch make 2 units that have no gas
pilot and need no outside source of electricity for gas ignition. One
uses 2 d batteries, which I have, and one has a mini hydro turbine
generator built in.

Do you recall the model numbers of the Bosch that does not require
electricity?

 

[Me]

...3 kW is 10.2K Btu/h of of water heating, and 1 Btu can heat
1 pound of water 1 F.

I thought that a BTU was equivelent to raising 1 cubic centimeter
of water 1 Degree F. Hmmmmm Maybe Alzheimers is setting in....

Me

 

[Mike Wilcox]

I thought that a BTU was equivelent to raising 1 cubic centimeter
of water 1 Degree F. Hmmmmm Maybe Alzheimers is setting in....

Me

I thought BTU was a 70's Rock band ;~))

 

[Graig Pearen]

I think the "Calorie" is 1Kg water 1 deg C. ("calorie" (small c) raise 1cc)

A BTU is 1 pound of water 1 def F. IIRC

You do recall correctly. BTU is an Imperial measurement as hinted by the name British Thermal Unit.
BTU is NOT part of the metric system.

Graig

 

[News]

You do recall correctly. BTU is an Imperial measurement as hinted by the name British Thermal Unit.
BTU is NOT part of the metric system.

....and not officially used by Britain anymore.

 

[[email protected]]

have anyone any experince of this unit.

http://world.honda.com/news/2004/c041020.html?

Also, does anyone know of any other cogen units around?

This site has non-vapourware units

http://www.whispertech.co.nz/

 

[Gordon Reeder]

[email protected] wrote in [email protected]:

...3 kW is 10.2K Btu/h of of water heating, and 1 Btu can heat
1 pound of water 1 F.


...50 gallons is 417 lb of water. You might heat it from 60 to 110 F
in about 417(110-60)/(10.2K Btu/h) = 2 hours.

Nick

OK, thanks.
The next question would be: How much space heating I could
get from it. But that would not be a simple answer because
solar gain and heat loss would have to be factored in.

But I can see where this would complement a solar PV system
perhaps with a passive solar as well. On cloudy cool days
when the PV and passive solar were not working to peak production
the cogen would provide both added heat and electricity.
My feeling is that it would have to be larger to be a primary
source of power.

--
Just my $0.02 worth. Hope it helps
Gordon Reeder
greeder
at: myself.com

Where is George Bush leading this country
and what are we doing in this hand basket??