[EnergyPlus_Support] Water film on a building wall

[HSIEH Chun-Ming <chunming@xxxxxxxxxxxxxxxxxxx>]

Hello,

I want to simply have a idea about how the building energy use decreases
when a thin water film system is installed on a specified wall of a 
building.
Heat is removed by water evaporation from the wall so that the 
temperature of outside wall reduces.
Therefore, we can also save the electric power of air conditioners
due to the temperature decrease of wall.
 From the experiment results, we know how much water evaporated during 
the daytime.
Is there any good way to simulate this kind of situation?

I am thinking of using the Other side Coefficients, but I am not sure 
how to do it.
Actually, two ways are available for us.
One is to set the temperature of outside wall directly.
The other way is to set both the film coefficient and the outside air 
temperature.
Under the assumption of how much heat was removed (the amount of water 
evapoated) from the experiment,
I want to use the later one instead of setting the wall temperature 
directly if it is a possibile way.

 From the Input-Output Reference,  there is a equation in the part of 
Other Side Coefficients.
However, C1, the combined convective film coefficient  was not shown in 
the equation.
I wonder how this coefficient works in the calculation?
Does it simply act as a coefficient for the temperature difference
between the outside temperature and air temperature.
It seems that a higher C1 gives a higher temperature of wall.

Do you have ideas to simulate the water film system by using another method?
Is there any simple way to remove 50 W/m2, for example, from the outside 
wall in the simulation?
Thank you very much.

Chunming




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