Wheezewort Cooling Math

[Silent_Shadow]

I am trying to understand how much heat a wheezewort gets rid of for designing a cooling system. The wiki and most people say it is 12,000 DTU/sec but I cannot seem to replicate this figure.

The wiki states that a wheezewort (domesticated) cools 1kg/sec by 5 degrees Celsius. Hydrogen is used as the gas to yield the most heat (DTU) removed. I assume that the rate of heat transfer (Q*) is defined as Q* = m*(c)(dT) where:
Q* is in DTU/sec
m* (mass flow rate) is 1kg/sec
c is 1.333 DTU/g*F (hydrogen)
dT (temperature difference) is 41*F (5*C converted to Fahrenheit)

When I do the math, it comes out to 54,653 DTU/sec which I believe is a little higher than 12,000 DTU/sec. Even if you try the wild wheezewort (at 250 g/s), it works out to 13,663.25 DTU/sec.

I think that my math is good, which means that either my assumptions or data were wrong, or a wheezewort cools a lot more than 12,000 DTU/sec.

The wiki has a similar looking equation on the wheezewort page, but looks to be using Kelvin and a different heat capacity.

Does anyone know anything definitive?

[Hedning]

Well since you are using Fahrenheit I can't easily help you. But in kelvin it's 2.4*1000*5=12000dtu. Maybe it's something wrong with the conversion to Fahrenheit?

Edit. Yes, 5°C is not 41°F. I think you used absolute numbers rather than difference.

[XceptOne]

a temperature change of 5°C/5K is a temperature change of 9°F
then the math will work out to 1.333 * 9 = 12 kDTU/s (for Hydrogen)

[Silent_Shadow]

Isn't the conversion from Celsius to Fahrenheit °F = °C (9/5) + 32°F ?

[Hedning]

First of all that formula is not correct. It should be °F = °C (9/5) + 32. Then it's not 5°C as in 5 above freezing, its dT=T1-T2=5C, so that last 32 in that formula cancels out, eg 5°C* (9/5) + 32- (0°C* (9/5) + 32)=(5-0)*(9/5)=9°F.

[Silent_Shadow]

Okay that makes more sense. Thanks!

[Angpaur]

This topic is such a great example why using Fahrenheit is a terrible idea, especially for science purpose ;-)

[Silent_Shadow]

I dunno, I think you have to use Rankine in thermodynamics, which is Fahrenheit plus a constant, or maybe that is just another artifact of the American system. There is no escape for me.

[Xilo The Odd]

Originally posted by Angpaur:

This topic is such a great example why using Fahrenheit is a terrible idea, especially for science purpose ;-)

yeah celsuis makes math suuuuper easy. been slowly adapting to using it for everything i can though.

[Bokonon]

Originally posted by Silent_Shadow:

I dunno, I think you have to use Rankine in thermodynamics, which is Fahrenheit plus a constant, or maybe that is just another artifact of the American system. There is no escape for me.

I've been using the Imperial system for 50+ years but for ONI I've come to think in Metric. Honestly it's just easier to think 0 is freezing and 100 is boiling when playing. Probably true outside the game too but in daily life it's hard not to think in gallons, feet, miles, degrees Fahrenheit and pounds (not the money) ...

[Xilo The Odd]

Originally posted by Bokonon:

Originally posted by Silent_Shadow:

I dunno, I think you have to use Rankine in thermodynamics, which is Fahrenheit plus a constant, or maybe that is just another artifact of the American system. There is no escape for me.

I've been using the Imperial system for 50+ years but for ONI I've come to think in Metric. Honestly it's just easier to think 0 is freezing and 100 is boiling when playing. Probably true outside the game too but in daily life it's hard not to think in gallons, feet, miles, degrees Fahrenheit and pounds (not the money) ...

i mean i work in the liquor industry and everything is measured in ml and liters. but when making a drink you have to convert that to oz. can be a pain in the butt some days when your brain just doesnt want to do it.

[Bokonon]

Originally posted by Xilo The Odd:

i mean i work in the liquor industry and everything is measured in ml and liters. but when making a drink you have to convert that to oz. can be a pain in the butt some days when your brain just doesnt want to do it.

That's a specialized case, may be your daily life but not most Americans :)

[Xilo The Odd]

Originally posted by Bokonon:

Originally posted by Xilo The Odd:

i mean i work in the liquor industry and everything is measured in ml and liters. but when making a drink you have to convert that to oz. can be a pain in the butt some days when your brain just doesnt want to do it.

That's a specialized case, may be your daily life but not most Americans :)

i see a looooooot of americans come in to buy stuff though xD. especially lately...

[Bokonon]

Originally posted by Xilo The Odd:

i see a looooooot of americans come in to buy stuff though xD. especially lately...

And most people don't care one iota until the bottle's empty!!

[gimmethegepgun]

Originally posted by Angpaur:

This topic is such a great example why using Fahrenheit is a terrible idea, especially for science purpose ;-)

It shows nothing of the sort. It shows the problems that arise from mistakes caused by converting things unnecessarily. If the relationships were given in units based on Fahrenheit rather than Celsius the problem wouldn't occur when trying to use Fahrenheit, and the same mistakes could occur if trying to convert it to Celsius.

Originally posted by Silent_Shadow:

I dunno, I think you have to use Rankine in thermodynamics, which is Fahrenheit plus a constant, or maybe that is just another artifact of the American system. There is no escape for me.

Rankine is to Fahrenheit as Kelvin is to Celsius. 0 Rankine is absolute zero, just as 0 Kelvin is absolute zero, you just add a constant to the Fahrenheit or Celsius temperature to get there. Both Fahrenheit and Celsius are crap for thermodynamics because they aren't based off of absolute zero, whereas Rankine and Kelvin are equally usable for that purpose, so long as your other units are based on the correct temperature scale.

[Angpaur]

Originally posted by gimmethegepgun:

It shows nothing of the sort. It shows the problems that arise from mistakes caused by converting things unnecessarily. If the relationships were given in units based on Fahrenheit rather than Celsius the problem wouldn't occur when trying to use Fahrenheit, and the same mistakes could occur if trying to convert it to Celsius.

ONI temperature calculations are based on Kelvin. Using anything other than Kelvin or Celcius is bad idea because you need to make the unnecessary convertions, you mentioned. And as we can see it is easy to make a mistake. Why convert enything if you can use a ready solution?