How grain coolers work
Grain refrigerators extract from grain and its surrounding air what can be dangerous to it: heat and water. Lowering the temperature and humidity protects the harvest even without chemical treatment.
The extent to which grain cooling protects the grain also depends on the type of grain. In any case, cooling preservation prevents loss of mass through cellular respiration, damage from insect activity and contamination with mould and the resulting mycotoxins. In the case of oilseeds, the oxidation process is additionally prevented, while in the case of seed and brewing cereals, the germination capacity is retained. In addition to protecting the grain quality, effective grain cooling pays off above all by extending the storage time. For example, lowering the grain temperature from 24 °C to 10 °C at a humidity of 14.5% increases the maximum safe storage period by a factor of 5.
Storage period timer for grain
Grain cooling eliminates the need to redistribute the grain in stores. This avoids costs due to abrasion losses and the energy requirements of the conveyor systems. In addition, no free silo cells have to be kept available. Subsequent drying of the grains is less energy-intensive due to the drying effect of the previous grain cooling. The gentler dehumidification also leads to fewer stress cracks. If grain cooling replaces chemical treatment, there is no need for chemical substances and storage protection measures.
It is essential for the most economical grain cooling to match the cooling solution to the application. Which crops should be cooled under which conditions? Is the crop already ventilated before cooling? Grain coolers of an unsuitable performance class cannot adequately regulate the temperature and humidity in the bulk grain, consume energy disproportionately or incur unnecessarily high acquisition costs. Consultation with FrigorTec at an early stage guarantees the selection of a suitable grain cooling device that economically fulfils the customer-specific requirements. In most cases, economic considerations result in a payback period of one to two years.
* After drying or in summer directly from the field
** Assumptions: 4.5 kWh/t electricity consumption and 0.04 EUR/kWh electricity costs
Criteria for the calculation of profitability of conservation cooling
The energy requirement of a grain cooling device depends on the temperature and humidity of both the grain and the ambient air. For the most economical operation, grain cooling units should be intelligently designed and equipped with modern functions. Crucial features are, for example, efficient electric motors, frequency-controlled fans, favourable flow control and a summer and winter thermostat. A summer thermostat interrupts the cooling process during the afternoon heat, since the cooling of the air would consume a lot of energy at this point. Modern grain cooling devices are efficiency-optimised in many ways. In some devices, for example, the post-connected heating unit is completely powered by the energy of the cooling circuit.
Numerous factors are involved in the correct setting of a grain cooling device. Many modern devices already process all relevant information fully automatically in one control unit. Thanks to the intelligently designed controls, the silo operator only has to enter three parameters: grain type, grain moisture and storage type. Optionally, data from measuring instruments can be fed from the store. The simplicity of settings means that no specific knowledge of the stored grains or additional training from the operating personnel are required. Automated control also simplifies data and sample acquisition. This ensures correct grain cooling even with few operating personnel at one location. Fully automated grain cooling units pay off in the long term for agricultural companies of all sizes.
FrigorTec offers the right grain cooling device for the preservation of grain in every climate zone. Please select the climate zone in which your plant will operate:
The GRANIFRIGOR™ Europe range of grain cooling units are performance- and energy consumption-optimised for the temperature and humidity of European temperate conditions.
The GRANIFRIGOR™ Subtropic grain cooling units are performance- and energy consumption-optimised for the temperature and humidity of the subtropical climate with tropical summers and non-tropical winters.
The GRANIFRIGOR™ Tropic grain cooling units are performance- and energy consumption- optimised for the temperature and humidity of the tropical climate.
The special grain cooling units for hot dry countries of the GRANIFRIGOR™ Desert series are performance- and energy consumption-optimised for hot desert climates.
The ventilation dryers of the GRANIVENT™ series are the ideal supplement to GRANIFRIGOR™ grain dryers. They are used to aerate the grain immediately after harvesting.
Our experts will be happy to advise you on the planning and implementation of your projects. Together we will find the tailor-made solution for your grain cooling requirements.