RV Fuel Issues & Prices - Post 'Em Here!

Fezziwig wrote:

DelCamper wrote:
Fezziwig

Actually heat pumps are not greater than 100% efficient as nothing can be. They get greater heat input than the power for the compressor.

Work out/Work in has more inputs. In the end there are losses.

Lot's of things are more than 100% efficient. When I step on the gas pedal with a few ounces of pressure I get 100s of horsepower! Wow! Much greater than 100% efficiency, as far as I'm concerned. That's why I have an engine instead of push pedals like in a toy car.

Try to tell the manager of your closest Mall that Heat Pumps are NOT more than 100% efficient. He knows what he spends on electricity and how much cooling or heating he gets.

If you're the manager of the Mall Of America in Minneapolis and it's 30 below outside you will turn on the heat pumps for your clients and get at least 3 times as much heat as from simple calrod heating elements. No kidding: it works! Of course the ground and air outside will get even colder as you draw residual heat from them, but who cares! That's outside.

Didn't they cover the Carnot cycle in your college physics course?

You need to draw your energy corral more properly. It is not enough to just draw it around the heat pump device.

I suppose that you believe that events of probability zero can never occur and events of probability one must occur, and yet it is quite easy to demonstrate exactly the opposite.

The shortcuts that people with meager knowledge make is astonishing.

You are finding out the truth about opinions! 1everyone has them but few are educated enough for them to be factual.
Had a guy telling me today about me topping off my tank in the truck. I let him go on and on( he definitely could've been emulating some here), finally I told him it was diesel. He said "so what". I put the cap on and got into the truck, drove off.

Fezziwig wrote:
Let me put it this way: if you have 1000 watts to put into heating, and you use a calrod (or other type of resistive heater), you will get about 1000 watts of heat. That's about 100% efficiency. Now suppose you put that 1000 watts into a heat pump and get 3000 watts of heat out of it, what is the efficiency of the heat pump?

you are confusing efficiency with Coefficient of Performance. You can't talk about efficiency unless you take into account the contribution of the heat source.

TANSTAAFL.

Do you expect to expect to get 1000 watts out of a 1000 watt solar panel? Must you always end your comments with a nasty remark? Can you not just have a civil conversation? Why not give it a try?

Put it any way you want. Your taping into an additional heat source with the heat pump not increasing efficiency above 100%.

Laws are Laws. This is ridiculous.

Let me put it this way: if you have 1000 watts to put into heating, and you use a calrod (or other type of resistive heater), you will get about 1000 watts of heat. That's about 100% efficiency. Now suppose you put that 1000 watts into a heat pump and get 3000 watts of heat out of it, what is the efficiency of the heat pump?

Don't feel bad Del, we get this sort of thing all the time.

I just tend to fall back to the law of the conservation of energy. I paid attention the day it was taught the day before and the day after.

"Energy cannot be created or destroyed only transformed from one form to another".

Efficiency is computed by work out/work in. In order to be more than 100% efficient the formula would require more work out than work in. That conflicts with the above law.

Why am I bothering to state the obvious? I have too much free time on my hands.

DelCamper wrote:
Fezziwig

Actually heat pumps are not greater than 100% efficient as nothing can be. They get greater heat input than the power for the compressor.

Work out/Work in has more inputs. In the end there are losses.

Lot's of things are more than 100% efficient. When I step on the gas pedal with a few ounces of pressure I get 100s of horsepower! Wow! Much greater than 100% efficiency, as far as I'm concerned. That's why I have an engine instead of push pedals like in a toy car.

Try to tell the manager of your closest Mall that Heat Pumps are NOT more than 100% efficient. He knows what he spends on electricity and how much cooling or heating he gets.

If you're the manager of the Mall Of America in Minneapolis and it's 30 below outside you will turn on the heat pumps for your clients and get at least 3 times as much heat as from simple calrod heating elements. No kidding: it works! Of course the ground and air outside will get even colder as you draw residual heat from them, but who cares! That's outside.

Didn't they cover the Carnot cycle in your college physics course?

You need to draw your energy corral more properly. It is not enough to just draw it around the heat pump device.

I suppose that you believe that events of probability zero can never occur and events of probability one must occur, and yet it is quite easy to demonstrate exactly the opposite.

The shortcuts that people with meager knowledge make is astonishing.

LindsayRichards wrote:
That 70 mph test is like a head on at 35 mph.

Nope, it's like a head on at 70. A head on at 35 does not double the force.

LindsayRichards wrote:
When a big car head ons a mini car, the G forces are a lots less on the heavier car.

This is true. How much you are injured is far more complicated and safety systems of each car are important also.

Maybe they should change the title of this thread to "(Alternate) Fuel issues and Prices." :B