- At 10:33 AM 5/31/01 -0700, you wrote:
>Charles,

Although James Watt conducted his tests with actual horses and something on

>

>In message 102 you said that a Horsepower can take place in one second. I

>have been wrestling with this and I guess I'm finally accepting it. I had

>always thought that lifting 33,000 pounds one foot in one minute actually

>mint "one minute" or else the rate of power would be different. I knew of

>course that it could have been lifted in ½ minute but thought the energy

>expended would then have to be at the rate of 2 Horsepower for ½ minute.

the order of 650lbs it was the math that produced the 33000 ft lbs /

min. IT is more popular these days to use the second as a measure of

time. So the math offers us the number 550 ft lbs/sec

>If it turns out that one square yard of the earth's surface actually

I don't know the actual power of solar exposure. I do know that the

>receives over a thousand watts per second constantly, then it's about 60

>times what I had always thought. I had thought that the Sun had to shine

>on it for a full minute to be one Horsepower. Now I find that it only

>takes one second.

silicon cells that I am using produce about 14W / ft^2 That is about 126W

/ yd^2 however they do not convert 450nm blue through UV or anything in

the long wave IR (>1000nm) or heat.

>I don't know the efficiency of today's solar cells but 30 years ago they

Just a point of interest. Another list pointed me to a source of screw in

>were about 6%. So 6% of 1000 watts per second is about the heat of a 60

>watt incandescent light bulb continuous.

>Even with the above losses of around 94% this is still a lot of free

>energy. Do you know the efficiencies of today's solar cells?

white LED bulbs for the home. A bulb that consumes 3W and is 50%

efficient laminates comparabley to a 30W incandescent 5% efficient. This

is great news although they are a bit costy.

http://www.theledlight.com/120-VAC-LEDbulbs.html

>Anyway, I'm trying to accept that 746 Joules per second is the same as 746

OK... 746 joules per second is a rate of change of energy which is

>watts per second.

power at 746W or one horse power.

A watt per second would be a rate of change in power. Sort of like miles

per hour is a rate of change in distance. Energy is more like the

distance. power is more like the speed.

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*******************************************

Do you know the efficiencies of today's solar cells

********************************************

To only partly participate please check

http://www.benwiens.com/energy1.html

I am pasting the relevant portion for your quick view

*************************************************

The light from the sun has an average temperament of

about 6300°K. The carnot-ratio diagram of Fig 26 shows

that the helmholtz-ratio of sunlight is about 95%.

This means that theoretically it should be possible to

convert 95% of the radiant-energy to electricity. In

actual practice, present day solar cells only convert

about 11% of the radiant-energy into electricity at

most. This means that 89% of the remaining sunlight is

converted into thermal-energy

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Regards .

Vikrant Suri

--- Boyd Cantrell <bmc@...> wrote: > Charles,>

=====

> In message 102 you said that a Horsepower can take

> place in one second. I

> have been wrestling with this and I guess I'm

> finally accepting it. I had

> always thought that lifting 33,000 pounds one foot

> in one minute actually

> mint "one minute" or else the rate of power would be

> different. I knew of

> course that it could have been lifted in ½ minute

> but thought the energy

> expended would then have to be at the rate of 2

> Horsepower for ½ minute.

>

> If it turns out that one square yard of the earth's

> surface actually

> receives over a thousand watts per second

> constantly, then it's about 60

> times what I had always thought. I had thought that

> the Sun had to shine

> on it for a full minute to be one Horsepower. Now I

> find that it only

> takes one second.

>

> I don't know the efficiency of today's solar cells

> but 30 years ago they

> were about 6%. So 6% of 1000 watts per second is

> about the heat of a 60

> watt incandescent light bulb continuous.

> Even with the above losses of around 94% this is

> still a lot of free

> energy. Do you know the efficiencies of today's

> solar cells?

>

> My interest here does not mean that I could prefer

> solar energy over

> converting the heat in a single reservoir it into

> work. That will always

> be paramount to me simply because the world teaches

> that it can't be done

> and I don't believe them.

>

> My new interest in Solar energy is finding out that

> the rate is 1.5

> Horsepower every single second instead of every

> minute. This extrapolates

> out to visualizing what my would-be Apparatus

> (which is to work in the

> shade) would do if the input heat exchanger were put

> out into the sunlight.

>

> Anyway, I'm trying to accept that 746 Joules per

> second is the same as 746

> watts per second.

>

>

> Boyd

>

>

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