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<br />e <br /> <br />- <br /> <br />~=- <br /> <br />..'.1....;.._ .-.." ~... "'-". ~ ......-~~ ~ ..1I!t...- -,. """d.>! .~.~. ..r- T'~-~-'~ <br /> <br />- ,.---.- ----... <br /> <br />" <br /> <br />. . <br /> <br />TurnerCqllie0Braden Inc. <br /> <br />July 29, 1983 <br />Mr. Jerry L. Hodge <br />City of La Porte <br /> <br />Page Six <br /> <br />.,. <br /> <br />The switchgear contained in the room includes a 37.5 KVA <br />transformer, a 75 KVAR capacitor, the main distripution <br />panelboard, motor control center A and the main righting <br />panel. Motor control center A contains a 15 KVA trans- <br />former, four size 4 motor starters, twelve size 2 motor <br />starters, and some smaller equipment. Four size 2 motor <br />starters are proposed to be added in the future. __ <br /> <br />We have calculated a heat gain of 12,200 BTUH in the <br />electrical switchgear room due to the equipment contained <br />in this area. When the outdoor ambient temperatures are <br />high, the heat gain in the switchgear room is enough to <br />cause thermal overloading of the motor starters in motor <br />control center A. Unless the heat generated by the switch- <br />gear is ventilated, it can be expected that there will be <br />some problems with nuisance tripping during summer months <br />or unusually hot days. In order to prevent this problem, <br />it will be necessary to provide some form of positive <br />yentilation for the switchgear room. <br /> <br />We have checked the existing air conditioning unit for the <br />op~rations building to determine if it would be possible <br />to~dd the electrical switchgear room to the system. <br />Unf~rtunately, the addition of the calculated heat gain to <br />the existing air conditioning load would create a total <br />heat gain that exceeds the capacity of the system by 27 <br />percent. Therefore, this is not a viable solution. <br /> <br />We have evaluated two other possible solutions. The first <br />solution would be to seal the wall between the storage and <br />switchgear areas, louver the exterior doors and install a <br />2300 cfm roof mounted exhaust fan. The second solution <br />would be to install two 2300 cfm roof mounted exhaust fans <br />and replace two of the windows in the storage room with <br />louvers. In either case, the fans should be two-speed <br />with double set-point thermostat control, <br /> <br />We recommend that the second solution be implemented, <br />i.e. install two roof-mounted exhaust fans. This will <br />permit ventilation of the storage area as well as the <br />switchgear room, and will have the added benefit of <br /> <br />/1 .v <br />l.... .... <br /> <br />.I <br />