Évaluations - 4, GPA: 3.5
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All heat loads have been taken into consideration in sizing air flowD. Gravity louvers face inward for air intake and outward for dischargeE. Where electrically operated ventilation devices are used, power must be present under all ! operating situations. Be certain these devices are on the emergency circuit The room in which the generator set is to be installed must have adequate air flow through it to! provide combustion air, and remove heat radiated from the engine, exhaust system and! generator. See Figure 2-14 for air flow calculations Figure 2-14 Air Flow Calculations ! Radiator Cooling! The engine mounted radiator shown in Figure 2-8. With an engine mounted radiator cooling! system, air movement is provided by the engine driven radiator fan. The consultant must design! the inlet and outlet duct work and louvers to accommodate the air flow required. The radiator fan! is limited in the amount of external static pressure it will tolerate. The maximum air restriction on! the discharge side of the radiator is shown under the heading of Cooling System on the Engine! Data Sheets. Cooling fan air flow is listed under Engine Data by dry type and water cooled! exhaust manifold for 100 °F and 125 °F cooling systems The ideal setup for cooling air would be to arrange the inlet or inlets such that relatively clean,! cool, dry air is drawn across the electrical switchgear, generator, and engine. The air is then! drawn into the radiator fan, and is blown through the radiator and exhausted by duct work outside! the building. Air inlets must be sized to minimize air restriction and provide the quantity of air! required by the radiator fan, engine combustion air, and any other air exhausts which might be! used in the room. On engine mounted radiator cooled systems, the engine mounted fan will! handle 0.25. of water column. This is combined intake and exhaust restriction The room air intakes must be located so as to minimize drawing exhaust fumes and other! outside contaminants into the room. Be very cautious about the location of the engine exhausts! in relation to room air intakes. Also, when locating the inlet and outlet, the consultant should! consider prevailing winds and noise. Motor operated louvers or properly designed and sized! gravity louvers should be used on the air intake and exhaust to minimize static pressure drop Electric motorized louvers used with engine mounted radiators should be connected to the! standby genset and controlled to open whenever the genset is running. Operable outlet louvers! should be temperature actuated on remote radiator or heat exchanger cooled units. Louvers! have resistance to air flow. Openings with louvers should be twice the area of an unobstructed! opening to provide proper air flow. At times duct work is necessary to provide cooling air for the! room, see Figure 2-15. Duct work must be sized and installed according to SMACNA Standards Wind Barrier! Wind blowing against air exhaust or intake openings of the genset room must be considered,! especially where the radiator and fan are located on the engine. Wind blowing against an! exhaust opening creates restriction to the fan. Wind blowing against intake openings can blow! open gravity louvers causing low temperature and moisture problems in bad weather MN2407 General Information 2-16 Figure 2-15 Radiator Cooling with Ducted Air Handling Other Engine Cooling Systems! Remote radiator and heat exchanger cooled engine cooling systems will not have an engine! driven fan. As a result, the consultant must provide a means of supplying air to the room, and! exhausting it. The air movement must be provided by an electrically driven fan. This fan may be! located in the air inlet or exhaust opening. If the fan is located on the exhaust side, care must be! taken to not create a high negative pressure in the room and starve the engine of combustion air If the fan is located in the air inlet, it must be noted that odors may be forced into other parts of! the building if the room is not properly sealed. This electrically driven fan must be connected so! as to run whenever the generator is operating. Any fans for the engine room should be on the! emergency circuit. An example may be seen in Figure 2-16 Figure 2-16 ! Engine Crankcase Ventilation! For gensets operating more than 1000 hours per year, the engine crankcase breather should be! vented upward and outside of the engine room. This prevents the buildup of oil vapors inside the! building 2-18 General Information!MN2407 Transfer Switch! Transfer Switch Checklist! A. !Locate transfer switch in a clean, dry place, near the emergency loadB. !Provide a circuit breaker between the genset and the transfer switchC. !Put a flexible connection between the conduit and gensetD. !Observe applicable codes in wiring.in the transfer switch and genset The transfer switch connects the genset to the emergency power system. The emergency power! system may include several gensets and several transfer switc...
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