Page 775 - Demo

743AIR CONDITIONERSDATA SUBJECT TO CHANGE WITHOUT NOTICE.IQ SERIESCOOLING SYSTEM SIZING CALCULATIONSizing ParametersWatts = Heat energy produced by electronic equipment Surface area = Surface area of the enclosure that will allow heat transfer (in sq.ft.) (H x W) x 2 + (H x D) x 2 + (W x D) x 2144 sq. in. * Eliminates surface not allowing heat transfer T = Difference between the maximum temperature outside the enclosure and the desired maximum temperature inside the enclosure. CalculationsStep 1 = Determine the Internal Heat Dissipation of the enclosed equipment in BTU. BTU per hour = Watts x 3.413 Step 2 = Determine Extenal Heat Transfer. BTU per hour = Surface Area x 1.25x T Note = The enclosure internal temperature must be at least 5%u00b0F higher than the ambient temperature to select a heat exchanger. This will result in a negative BTU per hour in step 2. Step 3 = Determine the Required Cooling Capacity in BTU per hour. BTU per Hour = Sum of Step 1 and Step 2. x 1.1 Safety Factor Air conditioner selection : Determine the required cooling capacity in BTU per hour. BTU per hour = (The sum of Step 1 and Step 2) x 1.1 safety factor Select the EXM air conditioner that meets or exceeds the cooling capacity in BTU per hour.Heat exchanger selection: Watts per %u00b0F = (The sum of Step 1 and Step 2) x 1.1 safety factor(Max. internal temp. - Max. outside temp.)x 3.413 Select the heat exchanger that meets or exceeds the required cooling capacityin Watts per %u00b0F. ______________________________________________________________________________________________ For assistance, please call EXM at 1-800-363-2423.The following calculations have been developed to determine the cooling requirements for standard uninsulated metal NEMA rated enclosures for indoor applications.Determine your cooling requirements by completing the following calculations, contacting your EXM sales representative at 1-800-363-2423, or e-mailing [email protected]. Please note: This formula is supplied for reference purposes only. EXM offers no warranty, expressed nor implied, as to the application of this formula, as the equipment may be subjected to conditions out of our control.