Table 2. Absolute direct and indirect effects of climate control measures on the difference between ambient and canopy air temperature, ΔT, and absolute humidity, Δq, and on the difference between canopy air and leaf temperature, ΔTleaf.
Values are obtained by multiplying the coefficients in a path and adding the multiplied coefficients from different paths. Note that negative values for ΔT mean a larger negative difference.
| Variable | HPS | Tpipe | Screen | Windowa | |
|---|---|---|---|---|---|
| ΔT | direct | 0.04 | 0.01 | - | - |
| indirect | -0.37 | -0.02 | 0.04 | - | |
| Δq | direct | - | -0.01 | 0.10 | - |
| indirect | 0.16 | 0.01 | 0.00 | - | |
| ΔTleaf | direct | 0.13 | -0.06 | - | - |
| indirect | -0.08 | - | 0.17 | - |
a The effect of window could not be calculated, since there was a strong direct feedback between ambient temperature and window opening. Window opening is added in the table for completeness.