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I am quite confused about the "evapotranspiration model" and "ZCLREANCE: Distance from bottom of slab to domainslab bottom edge of the area that will be modeled with the grid system" in the slab preprocessor. I found that those two variables has a large effect on the ground surface temperature.

so I just wondering that:

1. when should we use evapotranspiration model (or when should not use it)?
2. How to calculate the ZCLEARANCE in stead of using the default value 15m?

I am quite confused about the "evapotranspiration model" and "ZCLREANCE: Distance from bottom of slab to domainslab bottom edge of the area that will be modeled with the grid system" in the slab preprocessor. I found that those two variables has a large effect on the ground surface temperature.

so I just wondering that:

1. when should we use evapotranspiration model (or when should not use it)?
2. How to calculate the ZCLEARANCE in stead of using the default value 15m?