Lumina 750
Basic working principles
2.4.6
Fresh air control
The Lumina 750 controls the amount of fresh air to regulate the air temperature and O
2
content. Two settings
are used for fresh air control: the minimum and maximum fresh air settings. The fresh air control value is always
between these two limits. The Lumina 750 calculates the control value depending on the air inlet temperature or
O
2
. If both influences are present, the greatest influence applies.
2.4.7
Thermal control
Thermal control is an universal temperature control that is used as:
●
An independent temperature control for a pre-heater or pre-cooler (with its own temperature setting),
●
A second heating control (coupled to the first heating control),
●
A second cooling control (coupled to the first cooling control).
The Lumina 750 has 3 seperate thermal controls. Switch between these 3 via the index. For example see
Function key 8: Heating/cooling/steam (page 43).
2.4.8
Pressure control
The Lumina 750 can measure the pressure to control the exhaust air damper.
2.4.9
Measurement
The Lumina 750 can measure the following:
●
O2-concentration
●
CO2
●
Ammonia
●
Air flow
2.5
Working per tunnel phase
Tunnel phases and sub-phases will be explained below:
2.5.1
PHASE 1: Levelling
Aim
To bring the compost temperature to a required value within a certain period of time, or to level
the temperature differences within the compost.
Uses
●
.
fresh air to cool and to maintain the O
2
-concentration
●
fan to level compost temperatures
●
heating and steam (in some cases)
Method
●
levels during a pre-set time. Switches to other phases irrespective of the compost condition.
●
levels until the compost has reached the required condition. The Lumina 750 determines
when the switch is made to the next phase. If the compost does not reach the correct
conditions within the maximum levelling time, the Lumina 750 will automatically switch to the
next phase.
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