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Extra resources for A Hand Book For The Mechanical HVAC Designer

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To say it another way, we should expect less than 10% of the bearings in this application to fail within 40,000 hours. L-50 is the term given to Average Life and is simply equal to 5 times the Minimum Life. For example, the bearing specified above has a life of L-50 in excess of 200,000 hours. At least 50% of the bearings in this application would be expected to have a life of 200,000 hours or longer. 28 System Design Guidelines General Ventilation • Locate intake and exhaust fans to make use of prevailing winds.

6. Belts should never be forced or rolled over sheaves. More belts are broken from this cause than from actual failure in service. 7. In general, ideal belt tension is the lowest tension at which the belt will not slip under peak load conditions. Check belt tension frequently during the first 24-48 hours of operation. 4 Drive Loss, % Motor Power Output Estimated Belt Drive Loss† Motor Power Output, hp Higher belt speeds tend to have higher losses than lower belt speeds at the same horsepower. Drive losses are based on the conventional V-belt which has been the “work horse” of the drive industry for several decades.

3 to 4 Restaurants Restaurants Cafeterias Cocktail lounges Social clubs Night clubs Banquet room Sones Public buildings Residences Private homes (rural & suburban) Room Type Supermarkets Department stores (main floor) Department stores (upper floor) Small retail stores 7 to 21 6 to 18 4 to 12 6 to 18 Clothing stores 4 to 12 6 to 8 5 to 15 3 to 9 4 to 12 8 to 24 4 to 12 Transportation (rail, bus, plane) Waiting rooms 5 to 15 Ticket sales office 4 to 12 Control rooms & towers 6 to 12 Lounges 5 to 15 Retail shops 6 to 18 Miscellaneous Reception rooms Washrooms and toilets Studios for sound reproduction Other studios 3 to 9 5 to 15 1 to 3 4 to 12 Note: Values showns above are room loudness in sones and are not fan sone ratings.

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A Hand Book For The Mechanical HVAC Designer


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