Efficient defrosting enables quicker restart of cooling cycles. This prevents room temperature fluctuations and preserves the stored goods better, while saving up to 75% energy on the defrosting process.
The FabricAir®Defrost Duct™ is designed to effectively seal off the air cooler unit during defrosting cycles, thus preventing heat from leaking out into the freezer. This results in significantly more efficient defrosting.
Depending on the operating conditions, defrosting time is reduced by 10 to 50% when applying FabricAir®Defrost Ducts™. When the heat used to defrost the coils stays inside the unit, the cycle can be cut in half.
As an example, consider a typical medium storage facility with 2-units 46K BTU cooling each. The electric heater uses ~11KW. With an assumed cost of electricity of 15 cents per/kWh hour and a 50% reduction in defrosting time, the results of installing FabricAir®Defrost Ducts™ will be a 56% reduction in defrosting costs, equivalent of more than $1700 per year.
The recovery factor – energy used to cool the coils back down and recover the heat that escaped into the room – typically represent about 30% of what the defrost heaters used to defrost the coil. When the outlets are effectively covered by FabricAir®Defrost Ducts™ during the defrosting cycle, the recovery factor is significantly reduced.
In standard operation an air cooler unit consumes 21.9 kWh per day. With FabricAir®Defrost Ducts™ the defrosting time can be cut in half, thus consuming only 10.95 kWh per day - energy consumption is 50% less. If we assume that not only the defrosting time is cut in half, but also the number of defrosting cycles is cut in half (this example is not shown in that table), the energy consumption is a staggering 75% less. The savings percentages are slightly higher, if we add the energy used for the recovery to the equation, because the effect also means that the recovery factor is cut in half.