The basic challenge of VFD cooling comes from the fact that VFDs need to be placed in enclosure to protect them from the environment, and, paradoxically, these enclosures trap heat.
And with the adoption of VFD technology, many applications require enclosures designed for challenging environments, from weather and impact outdoor enclosures to sealed, stainless steel enclosures for production facilities that must withstand hosedown cleaning.
In large box, the temperature between the area and the area causes slight airflow called natural convection.
The smaller form factor of VFDs and their enclosures contribute to overheating in another way smaller box means less surface area on the exterior is available to transmit heat to the surrounding air.
Three-quarters of these motors are variable-torque fan, pump, and compressor loads, the types of applications ripe for the efficiency afforded by VFDs..
The energy savings can be calculated using the laws of affinity The power drawn is proportional to the cube of the rotational speed.
This heat loss from VFD is important to quantify, not for its financial impact, except rather for the danger that overheating poses to VFD electronics if the heat trapped in the enclosure is allowed to exceed temperature limits..
Refrigerant enters the compressor under low pressure and temperature, where it's compressed.
Passive Cooling Rule of Thumb — For passive cooling solutions, such the rule of thumb is 4 cfm is required for every 1 hp to maintain 10°C above ambient in the enclosure.
By simplifying the calculation of cooling requirements, the adoption of VFD technology will continue to grow, and users will benefit from performance and service life...
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