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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Product idea
Date: Wed, 12 Feb 2025 13:24:10 -0700
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On 2/12/2025 11:27 AM, bp@www.zefox.net wrote:
> Carlos E.R. <robin_listas@es.invalid> wrote:
>>>
>>> Couldn't you burn gas, boil water, spin a generator to make
>>> electricity, and heat your house with the condensate heat?
>>>
>>> That would make free electricity.
>>
>> Certainly, and it has a name. Combined cycle, or something similar. It
>> is a simple as running a diesel generator and heating the house with it
>> radiator, and a heat exchanger on the exhaust.
> 
> Long ago there was a residential product introduced:
> https://hondanews.com/en-US/releases/honda-and-climate-energy-begin-retail-sales-of-freewatt-micro-chp-home-heating-and-power-system
> 
> Far as I know it failed commercially, but it's unclear what went wrong.
> Capital cost might have been the stumbling block, as it surely would
> be with a crypo-mining heater. A few kW of computers costs much more
> than a few kW of nichrome wire resistance elements.

A local (SoAZ) firm made a (PV) solar collector that used a mirror to
focus the sunlight on a small element.

As efficiency drops with temperature, they used water cooling to keep
the device from "melting".

And, realized they had a good source of hot water.

Similarly, you can purchase an add-on for your ACbrrr that more
efficiently cools the condenser -- with water.  And, circulates
this water through your swimming pool.

I wonder how corrosive the chemicals used to treat the poolwater
are wrt this heat exchanger?

I "store" surplus solar power in *data*.  Perhaps the most efficient
"storage" mechanism for "energy" (i.e., as "work done")?