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About the filter
The table below provides an estimation of the gas exchange capacity of different types of Microboxes. Kv is the volumetric gas exchange coefficient by means of diffusion throughout the filters.
It represents the number of gas replacements in the vessels per time unit
(unit: GE/day).
The Kv value is determined by the type of filter, the filter length and the gas volume in the containers. It should be noted, however, that these values are representative for empty boxes; they may change under growing conditions.
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| KV value fo: |
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round Microboxes 0118/80 |
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oval Microboxes OV80 |
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| L: white filter |
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9,87 GE / day |
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7,44 GE / day |
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| XL: yellow filter |
|
13,09 GE / day |
|
9,84 GE / day |
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| XXL: red filter |
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15,58GE / day |
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10,83 GE / day |
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| XXL+: green filter |
|
81,35 GE / day |
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62,87 GE / day |
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The choice of the ideal filter type will depend on a number of parameters, such as:
- Plant variety: even different cultivars of the same species may behave differently
- Generation time, i.e. time span needed for growth
- Regime of the incubation chamber: presence of floor cooling, type of shelves, number and position of the plants on the shelves,
air circulation, light regime and intensity, temperature
- Development phase of the plants
- Volume and composition of the substrate in the culture vessel
One may deduce from the Kv table that the dehydration rate under green filters (XXL+) is relatively high. However, this will be of
minor influence with cultivars having a short generation time. Dehydration can also partly be overcome by increasing the volume of
growing medium.
Conclusion: comparative tests are necessary to decide about the appropriate filter type. |
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