Calculation of Heat Generated in Control Panel

The heat or energy dissipated can be calculated, but instantaneous values would be a chaotic prediction. Easy ones are lamps, just VA X duty cycle. The coils again VA X duty cycle the efficiency of the coil really doesn't matter in this closed system and it is used to reduce total VA anyway. Cable, current squared X resistance per metre X metres. Contact resistance, use a micro-ohmmeter and add a fudge factor like double. In reality new contacts arent too great until some contact wetting current removes the corrosion formed in storage. CTs, VTs, Autotrannies etc duty cycle X power X efficiency. Burdens duty cycle X current squared X resistance. Try your calculated result against 10% of system power and raise a bit if needed. If above 10% redesign. Remember the rules of thumb regarding efficiency of motors and transformers.

If you need the calculations for air conditioning you could find some clues in the ASHRAE handbook, try this. Good luck Oscar

You can use the power consumption igures for various devices. For instance say you have an industrial grade relay with a coil that operates at 120 vac and draws 1 amp. Using the standard formula for power (W=I*E) 120 times 1 = 120 watts, the majority of which will be converted to heat. Then if it only has a 50% duty cycle you multiply by .50. Do this for each component and you will have your total wattage. Then all you have to do is use a good HVAC reference to figure how many BTU's of cooling power you need to keep things at an even temperature.

We require to know the calculation for panel AC requirement for our 1 machine. The details are as below- Panel area = 7.5 * 4 * 2.5 ( ft ) Electrical accessories used inside the panel Drives = 25kw VFD = 11 kw 12 nos. MPCB ( range from 5 A to 20Amp) 20 nos contactors ( range from 5 amp to 20 amps ) 35 nos. relay ( rating 2 amp each ) Kindly suggest the panel AC reqd for this application , pl. elaborate the calculation details to understand the basic rules. Thanks & Regards Sachin Save

We require to know the calculation for panel AC requirement for our 1 machine. The details are as below- Panel area = 7.5 * 4 * 2.5 ( ft ) Electrical accessories used inside the panel Drives = 25kw VFD = 11 kw 12 nos. MPCB ( range from 5 A to 20Amp) 20 nos contactors ( range from 5 amp to 20 amps ) 35 nos. relay ( rating 2 amp each ) Kindly suggest the panel AC reqd for this application , pl. elaborate the calculation details to understand the basic rules. Thanks & Regards Sachin Save

For air conditioning purposes, why not measure the control cabinet's surface area and temperature? The control cabinet will "appear" to be a fairly constant heat source with radiating surfaces all over. The temperature difference between the cabinet and the ambient air in the room will give you the information you need to calculate heat transfer to the room.

Go to rittal.co.uk or eldon.co.uk. they are cabinet manufacturers who supply cooling devices and will supply free software to calculate panel temperatures at various ambients and altitudes

Dear sir, if have the procedure for the calculation of the heat dissipation from the electrical control panel then plz reply to me.

Measure the current consumed by the <...panel...>, and multiply it by the supply voltage.

Simplesζ.