The temperature and pressure of the air in the cylinder rise dramatically. The compression stroke: When the piston reaches the limit of its downward travel, it reverses direction, the intake valve closes, and the piston compresses the air in the cylinder.The intake stroke: As the piston travels downward, the intake valve opens, and the turbocharger delivers compressed air to the cylinder.Here’s a simplified description-looking at a single cylinder-of how a four-stroke, turbocharged diesel engine works: To understand how wet stacking happens, one must have at least a cursory knowledge of the operation of a diesel engine. Whatever the reason, diesel generators that aren’t regularly exercised at a significant fraction of their nameplate capacities are at risk for wet stacking. Generator sets may have been oversized in anticipation of load growth that didn’t materialize. ![]() Data center operators often refrain from switching uninterruptible power supplies (UPS) to emergency power during tests to avoid affecting battery warranties with excessive transfers. Building operators are reluctant to interrupt critical loads for transfer to generator and back to utility. Many of these generators are routinely tested at no load or at light loads, for a variety of reasons. Most standby generators for facilities have a diesel engine as the prime mover. Over a prolonged period, this condition can seriously degrade engine performance. ![]() ![]() Today, the term refers to an engine that isn’t completely burning all the fuel that’s delivered to its cylinders. “Wet stacking” is a term that originally described a diesel engine dripping a thick, dark substance from its exhaust pipes or, as they’re often called, “stacks.” The dripping exhaust stacks were called “wet stacks,” and the engine was said to be “wet stacking.” The condition is caused by operating the engine at light load for extended periods, sending unburned fuel and soot into the exhaust system.
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