commercial electrical panel load calculation spreadsheet

We want the internal temperature to be ✬. The area of the control panel exposed sides, except for the top is 42 square feet or 3.9 square meters. The maximum outside temperature expected is ✬. The control panel has two frequency drives totaling 10 horsepower and one module rated at 100 watts. Temperature Difference in Deg F BTU/hr./sq. Provide this information to Nex FlowT to assist in sizing the appropriate cooling system. Note the size and number of any external fans.If you do not know the power used in the enclosure but you can measure temperatures, then measure the temperature difference between the outside at current temperature, and the present internal cabinet temperature.Sum the internal and external heat loads calculated.per square foot (or watts per square meter) to get the external heat transfer in BTU/hr or in watts. Multiply the panel surface area times the BTU/hr.per square foot (or watts per square meter) for the temperature difference. Location: Feed Thru Lugs SubFeed Lugs Serving: OF Bus: Main C.B. From the conversion table that follows, determine the BTU/hr.Choose the internal temperature you wish to have, and choose the temperature difference between it and the maximum external temperature expected.For heat transfer from the outside, calculate the area exposed to the atmosphere except for the top of the control panel.For example, if you know the power generated inside the unit, assume 10% of the energy is dissipated as heat. Determine the heat generated inside the enclosure.outside panel in degrees C) x LPM Calculating BTU/hr. ELECTRICAL LOAD CALCULATION FOR PANEL Note: Enter Your System Detsils. Watts cooling effect from fan: 0.16 x (temp. Total heat load consists of the heat transfer from outside your panel and from the heat dissipated inside the control unit.īTU/hr. Some labs may have industrial type equipment or other high heat producing equipment, which will cause the cooling load and airflow values to be on the higher.

Commercial electrical panel load calculation spreadsheet