Derived parameters from gathered data. The timestep column indicates the resolution (hourly, daily, bi-daily, monthly)
| Derived parameter (unit) | Timestep | Calculation methodology |
|---|---|---|
| Temperature in the tunnel (°C) | Hourly Daily: night 1am and day 1pm | Taken as the weighted average by location of the temperature sensors in the farm |
| Relative humidity – Acceptable conditions [0 – 1] | Hourly | Taken as proportion to acceptable level [45%-65%] |
| Air mixing (horizontal and vertical) | Hourly | From horizontal and vertical stratification of temperature |
| Air velocity | Hourly | Average (including calibration correction for low air velocities), looked at in combination with door status (open/ closed) and ventilation setting |
| Air change rate (h-1) | Daily | Difference between the max and min CO2 level in the day |
| Length of photo-period (-) | Daily | Derived from energy use (time of energy use change – only since hourly metering, period was constant at 18hours) |
| Outdoor temperature (°C), relative humidity (%) | Hourly and Night/Day differentiation | Measured hourly, and average night-time/daytime (corresponding to photoperiod) |
| Precipitation (mm) & relative humidity (%) | Hourly (+1, +2, +3 hours, +12 hours, + 1 day) and Daily | Correlation window is analysed with delay |
| Percentage of occupied area of farm (%) | Daily | Disaggregation of harvest data in between date underlights and harvested, taken as proportion of farm with increasing farmed area. |
| Yield performance of three main and sufficiently representative crops: peashoots, wasabi mustard and salad rocket (-) | Daily | Taken as the eventual yield performance of each crop, for a given day. Yield is calculated by (mass harvested + surplus)/area [g/m2]. Yield performance is taken against the average yield of that crop. |
| Growing days of crop (-) | Daily | Taken as eventual (number of growing days)/(average number of growing days for crop) |
| Energy use (kWh) | Daily, Monthly | Sum of metred energy use, as fraction of capacity |
| Water use (L) | Daily, Monthly | Disaggregated water quantity filled in water tanks by calendar day |
| Crops (g/m2) | Daily, Monthly | Quantity grown per calendar month |
| Crop health (%) | Daily | Percentage lost to crop disease |
| Derived parameter (unit) | Timestep | Calculation methodology |
|---|---|---|
| Temperature in the tunnel (°C) | Hourly Daily: night 1am and day 1pm | Taken as the weighted average by location of the temperature sensors in the farm |
| Relative humidity – Acceptable conditions [0 – 1] | Hourly | Taken as proportion to acceptable level [45%-65%] |
| Air mixing (horizontal and vertical) | Hourly | From horizontal and vertical stratification of temperature |
| Air velocity | Hourly | Average (including calibration correction for low air velocities), looked at in combination with door status (open/ closed) and ventilation setting |
| Air change rate (h-1) | Daily | Difference between the max and min CO2 level in the day |
| Length of photo-period (-) | Daily | Derived from energy use (time of energy use change – only since hourly metering, period was constant at 18hours) |
| Outdoor temperature (°C), relative humidity (%) | Hourly and Night/Day differentiation | Measured hourly, and average night-time/daytime (corresponding to photoperiod) |
| Precipitation (mm) & relative humidity (%) | Hourly (+1, +2, +3 hours, +12 hours, + 1 day) and Daily | Correlation window is analysed with delay |
| Percentage of occupied area of farm (%) | Daily | Disaggregation of harvest data in between date underlights and harvested, taken as proportion of farm with increasing farmed area. |
| Yield performance of three main and sufficiently representative crops: peashoots, wasabi mustard and salad rocket (-) | Daily | Taken as the eventual yield performance of each crop, for a given day. Yield is calculated by (mass harvested + surplus)/area [g/m2]. Yield performance is taken against the average yield of that crop. |
| Growing days of crop (-) | Daily | Taken as eventual (number of growing days)/(average number of growing days for crop) |
| Energy use (kWh) | Daily, Monthly | Sum of metred energy use, as fraction of capacity |
| Water use (L) | Daily, Monthly | Disaggregated water quantity filled in water tanks by calendar day |
| Crops (g/m2) | Daily, Monthly | Quantity grown per calendar month |
| Crop health (%) | Daily | Percentage lost to crop disease |
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