Plant Services - August 2008 - (Page 37) EFFICIENCY Compressors Big losses 6-7 hp Waste heat & inefficiences 6-7 hp Waste heat & inefficiences 7-8 hp Input Motor Air compressor 1 hp pneumatic output 7-8 hp Input Motor Air Outlet pressure compressor 100 psig Inlet pressure atmosphere 1 hp pneumatic output Inlet pressure Outlet pressure atmosphere 100 a compressor is lost and Figure 1. Most of the energy input topsig unable to perform useful work. Only half doesuses 10% work 50% useful Normal production Artificial demand 15% Inappropriate Inappropriate uses 10% Artificial demand 15% Leaks 25% Normal production 50% IS YOUR PRESSURE TESTING PROCESS FULL OF HOLES? Fast Connection Tools for Leak and Pressure Testing Demand side Leaks 25% 200 hp VSD with built-in dryer Supply side Figure 2. This is a typical distribution of the air consumption in a manufacturing operation. pressor room or at the local workstations to mitigate unacceptable pressure fluctuations. Supply e energy required to keep a system in balance comes from side 200 hp VSD awith200 hp compressor and available excess compressor capaccombination dryer built-in of storage ity. Running a compressor partially loaded provides the unused reserve that can be drawn upon as needed. Partially loading a compressor, however, can be inefficient and costly, particularly if the compressor is oversized. In fact, an unloaded, fi xed-speed compressor can consume 20% to 25% of its rated horsepower even when idling. Storage, therefore, must be sufficient to allow an unloaded compressor to time out and shut down, even during short-duration events. e compressor would come on line only when the operating 200 hp compressor compressor(s) plus storage could no longer sustain the minimum system pressure. Using motor horsepower as an energy reserve is costly. e better approach is to take advantage of the storage-based reserve Headline in advance of the intermittent peak demands and keep unloaded compressors shut down. A Air receiver 500 gallons Intermediate control 100% GUARANTEED Demand side Air receiver 500 gallons Intermediate control 1-800-444-2373 www.fastestinc.com http://www.fastestinc.com
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