![background image](http://html1.mh-extra.com/html/zoltec/beltomatic/beltomatic_operators-manual_3988561019.webp)
coolers use the same air intake. Control the airflow by increasing or decreasing the fan pitch,
motor hertz, or horsepower of the cooling fan.
E. Controlling Capacity
Capacity is adjusted through the product depth, airflow, and conveyor belt speed. The amount of time
each process requires depends on the product temperature, moisture, size, and drying characteristics.
Contact B.N.W. Industries for recommended speeds and depths.
Enough airflow must be introduced to remove the needed BTU's in cooling applications. Enough
airflow and BTU's must be present to evaporate the required amount of water in drying applications.
We use the factor of 18 to figure this. Take the fan cfm (in thousands) x 18 x heat rise °F x 60 minutes
= BTU’s produced. For example, if your fan is producing 20,000 cfm it will figure as followed: 20 x
18 = 360. 360 x 150°F = 54000. 54000 x 60 = 3,240,000 BTU per hour. In this example heat rise is
based on 70°F ambient air temperature. A 150°F heat rise would equal 220°F plenum air temperature.
Altitude, humidity, air temperature, and barometric pressure will vary the required energy. We
calculate 1,500 BTU’s to evaporate one pound of water. Some products will take more while others
take less. Multiply 1,500 BTU’s by the total pounds of water per hour to be removed. This will give
you the total BTU’s required per hour. Vapor LP gas has 92,000 BTU’s per gallon, natural gas has
1,000 BTU’s per cubic foot, and steam has 950 BTU’s per one pound.
Adjust the airflow and heat rise to produce the required energy based on the moisture removal.
Maximum capacity will be reached when the depth, time, airflow, and temperature are correct. When
cooling a product you need only enough airflow and time at a correct depth to remove the required
BTU.
F. Controlling Efficiency
Efficiency of a machine is very important. Maximum efficiency is reached when the exhaust air is
saturated. The air must be adjusted and/or recycled if it is not saturated. Correct airflow and bed depth
are vital for good efficiency. Efficiency in drying applications is gauged by measuring the gas
consumption and/or reading the machine's thermometers. Thermometers are placed in the bottom air
plenum, between each conveyor belt, and at the provided exhaust opening. Generally, the lower the
temperature reading at the exhaust opening the more efficient the process. This is due to evaporation
cooling. Belt-o-matic dryers incorporate a bottom or top air chamber design. This design produces a
gradient exhaust temperature. Exhaust air temperature can be measured at various points down the
conveyor belt. The best air quality can be captured and recycled to produce better efficiency. Consult
B.N.W. Industries for more information.
Changing the plenum air temperature, airflow, bed depth, and conveyor belt speed will vary the
efficiency. For instance, increasing the bed depth will allow more energy to be absorbed. However,
this can produce a slight variation in moisture content from the top of the bed depth to the bottom of
the bed depth. Stirrers and multiple pass configurations lessen moisture variation. Contact B.N.W.
Industries for best settings.
VII. MAINTENANCE
Belt-o-matic machines should be properly maintained to ensure years of continual service. The
following guidelines need to be observed.
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