Need some help solving a formula

[Thisisme1]

Hi guys,

Sorry if this sounds stupid but I really don't understand how to work this.

. . . . .\(\displaystyle \Delta\, T\, =\, \dfrac{0.017K\, +\, 2.64}{1\, +\, 0.085u^{0.08}}\). . . . .-------(1)

Where:

. . . . .\(\displaystyle \begin{align}\Delta\, T\, &=\, temperature\, difference\, between\, greenhouse\, insides\, and\, ambient\, (^\circ C)
\\ K\, &=\, global\, irradiance\, outside\, greenhouse\, (w\, /\, m^2)
\\u\, &=\, wind\, velocity\, measured\, at\, 4\, m\, above\, ground\, (m/s)
\\R\, &=\, renewal\, (air\, change\, rate)\, per\, hour
\\K_{max}\, &=\, maximum\, global\, irradiance\, (w\, /\, m^2)
\end{align}\)

So lets say global irradiance is 678 w/m2 and wind velocity is 5.6 m/s. Then I would say that the formula is (678+2.64) / (1+5.6). Now obviously I don't know what the **** I am doing here because I end up with 103.18.

What am I doing wrong? Can someone give me a example of the formula's proper execution using my numbers?

Thanks in advance!!

PS: If this is in the wrong subforum sorry! Mod please move it.

 

[Deleted member 4993]

Hi guys,

Sorry if this sounds stupid but I really don't understand how to work this.

. . . . .\(\displaystyle \Delta\, T\, =\, \dfrac{0.017K\, +\, 2.64}{1\, +\, 0.085u^{0.08}}\). . . . .-------(1)

Where:

. . . . .\(\displaystyle \begin{align}\Delta\, T\, &=\, temperature\, difference\, between\, greenhouse\, insides\, and\, ambient\, (^\circ C)
\\ K\, &=\, global\, irradiance\, outside\, greenhouse\, (w\, /\, m^2)
\\u\, &=\, wind\, velocity\, measured\, at\, 4\, m\, above\, ground\, (m/s)
\\R\, &=\, renewal\, (air\, change\, rate)\, per\, hour
\\K_{max}\, &=\, maximum\, global\, irradiance\, (w\, /\, m^2)
\end{align}\)

So lets say global irradiance is 678 w/m2 and wind velocity is 5.6 m/s. Then I would say that the formula is (678+2.64) / (1+5.6). Now obviously I don't know what the **** I am doing here because I end up with 103.18.

What am I doing wrong? Can someone give me a example of the formula's proper execution using my numbers?

Thanks in advance!!

PS: If this is in the wrong subforum sorry! Mod please move it.

You need to use 0.017 *K = 1.526 (instead of just 678) and

You need to use 0.085 * u^0.08 = 0.09751 (instead of just 5.6)

and continue.....