Benefits of Cold weather!
11-07-03, 11:41 AM
#16
Lexus Champion
Cooler air = nature's intercooler. More oxygen (not air, we don't burn nitrogen, carbon dioxide, or any of the trace gases) is part of the story. But internal combustion engine is a Carnot cycle; all other things being equal, the thermodynamic efficiency is related to the difference between intake temp and exhaust temp.
All things aren't equal, since gasoline's vapor pressure (well, every other liquid's vapor pressure, too) drops as the temp goes down. At some point gasoline vapor begins condensing and is unavailable for effective cylinder combustion. So, efficiency/power begins to drop. Mostly a theoretical problem except for our members up where the temps get down to single digits and below......................
All things aren't equal, since gasoline's vapor pressure (well, every other liquid's vapor pressure, too) drops as the temp goes down. At some point gasoline vapor begins condensing and is unavailable for effective cylinder combustion. So, efficiency/power begins to drop. Mostly a theoretical problem except for our members up where the temps get down to single digits and below......................
11-07-03, 06:21 PM
#17
Pole Position
Originally posted by GS4fun
I'm sure she would get a kick out of it.....or someone would get a kick in the mouth....one or the other is certain!
I'm sure she would get a kick out of it.....or someone would get a kick in the mouth....one or the other is certain!
I told my wife about this thread and started by just mentioning the title. First thought in her mind was the same as mine!
Wonderful woman!
11-07-03, 07:15 PM
#18
Lexus Fanatic
iTrader: (20)
Originally posted by Mr Johnson
The main benefit of cold weather is when I ask my wife to get the newspaper without a coat in her T-shirt...
The main benefit of cold weather is when I ask my wife to get the newspaper without a coat in her T-shirt...
11-07-03, 07:58 PM
#19
Moderator
Originally posted by Mr Johnson
Nah....
I told my wife about this thread and started by just mentioning the title. First thought in her mind was the same as mine!
Wonderful woman!
Nah....
I told my wife about this thread and started by just mentioning the title. First thought in her mind was the same as mine!
Wonderful woman!
11-08-03, 12:12 PM
#20
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Worst part about cold weather is that my engine ticking is back! Plus I have to put the snows on now. At least the seat heaters are good in the car. I have to admit, for a single level system, it works well.
11-08-03, 03:09 PM
#21
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Originally posted by mooretorque
Cooler air = nature's intercooler. More oxygen (not air, we don't burn nitrogen, carbon dioxide, or any of the trace gases) is part of the story. But internal combustion engine is a Carnot cycle; all other things being equal, the thermodynamic efficiency is related to the difference between intake temp and exhaust temp.
All things aren't equal, since gasoline's vapor pressure (well, every other liquid's vapor pressure, too) drops as the temp goes down. At some point gasoline vapor begins condensing and is unavailable for effective cylinder combustion. So, efficiency/power begins to drop. Mostly a theoretical problem except for our members up where the temps get down to single digits and below......................
Cooler air = nature's intercooler. More oxygen (not air, we don't burn nitrogen, carbon dioxide, or any of the trace gases) is part of the story. But internal combustion engine is a Carnot cycle; all other things being equal, the thermodynamic efficiency is related to the difference between intake temp and exhaust temp.
All things aren't equal, since gasoline's vapor pressure (well, every other liquid's vapor pressure, too) drops as the temp goes down. At some point gasoline vapor begins condensing and is unavailable for effective cylinder combustion. So, efficiency/power begins to drop. Mostly a theoretical problem except for our members up where the temps get down to single digits and below......................
11-08-03, 03:39 PM
#22
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Simple Equation
Simple calculations:
Carnott Efficiency = 1 - (input Temperature/output Temperature)
Input temperature is the ambient temperature, while your exhaust temperature is constant.
Therefore, if input temperature drop, the ratio of (input Temperature/output Temperature) drops as well.
Finally, 1 subtracts smaller ratio = bigger number -------> increase efficiency
Carnott Efficiency = 1 - (input Temperature/output Temperature)
Input temperature is the ambient temperature, while your exhaust temperature is constant.
Therefore, if input temperature drop, the ratio of (input Temperature/output Temperature) drops as well.
Finally, 1 subtracts smaller ratio = bigger number -------> increase efficiency
11-08-03, 08:45 PM
#23
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Re: Simple Equation
Originally posted by Hypermagic
Simple calculations:
Carnott Efficiency = 1 - (input Temperature/output Temperature)
Input temperature is the ambient temperature, while your exhaust temperature is constant.
Therefore, if input temperature drop, the ratio of (input Temperature/output Temperature) drops as well.
Finally, 1 subtracts smaller ratio = bigger number -------> increase efficiency
Simple calculations:
Carnott Efficiency = 1 - (input Temperature/output Temperature)
Input temperature is the ambient temperature, while your exhaust temperature is constant.
Therefore, if input temperature drop, the ratio of (input Temperature/output Temperature) drops as well.
Finally, 1 subtracts smaller ratio = bigger number -------> increase efficiency
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