How to Calculate Heat Load

*Caution must be taken with this test as equipment inside the enclosure/application may overheat.*

To perform the heat load calculation:

  1. Locate the enclosure/application centrally in the internal temperature-controlled environment.
  2. Locate one of the temperature sensors centrally inside of the panels, 2 inches from the top.  Sensor should not be located in the discharge air stream of any internal components or be in contact with any of the components.
  3. Sensor two should be located 2 feet from the outside of one of the enclosure/application walls, at a distance from the floor equal to the enclosure height.  The sensor should not be affected by any ambient heat sources or moving air.
  4. Check that all enclosure/application doors are closed as in normal operation.
  5. Apply power to the enclosure/application internal components.  Check that all components are in operation at full capacity as in field service.
  6. The internal temperature should begin to rise due to the internal heat dissipation of the equipment.  The internal temperature will continue to rise until the heat transfer through the enclosure/application surfaces to the ambient air equals the amount of heat produced by the internal components.  The temperature rise will occur at a greater rate initially, and then slow until stabilization.  When the internal enclosure/application temperature and the outside ambient temperature stabilize for a minimum 5 minutes (+/- .5°F), record the internal enclosure/application and the outside temperatures.

These two temperatures, the enclosure/application surface area, and a heat transfer coefficient can then be used to estimate heat dissipation of the internal equipment.