ML20043F677
| ML20043F677 | |
| Person / Time | |
|---|---|
| Issue date: | 02/12/2020 |
| From: | Office of the Chief Human Capital Officer, Woodard Corp |
| To: | |
| Gary Callaway | |
| Shared Package | |
| ML20043F634 | List:
|
| References | |
| Download: ML20043F677 (13) | |
Text
Chapter 6 ENGINE COOLING SYSTEMS
Learning Objectives As a result of this chapter, you will be able to:
- 1. State the purpose of a diesel engine jacket water cooling system.
- 2. Identify major components of a typical engine cooling system and describe their operation.
- 3. State the purpose and describe operation of jacket water keepwarm systems commonly used on NPP diesels.
Learning Objectives (continued)
- 4. State the purpose of a diesel engine intercooler (aftercooler) water cooling system, identify its major components, and describe their operation.
- 5. Identify other cooling requirements, such as engine room cooling.
Engine cooling water system functions to:
Remove approximately 25 to 30% of engine heat input via jacket water and intercooler systems.
Dissipate cooling water heat by either or both:
Air-cooled radiators Shell and tube heat exchangers cooled by service water
Cooling water system temperature controls function to:
Keep shutdown engine warm to enhance startup.
Keep operating engines hot for better efficiency, yet cool enough to prevent overheating critical parts.
Enhance engine turbocharging by cooling the combustion air after it has passed through the turbo-compressor, to increase air density.
Figure 6-1 Jacket Water Cooling System with Keepwarm Engine cooling system components Liquid coolant Jacket water pump Thermostatic control valve Expansion tank or Standpipe Jacket water heat exchanger Keep-warm systems NOTE: Engine manufacturers typically do not establish a cooling water spec, but recommend use of a specialist to determine requirements based on local water conditions.
Figure 6-2 Jacket Water Pump Figure 6-3 Thermostatic Control Valve
Figure 6-4 Intercooler Water Cooling System Engine Intercooling Water System Components Liquid coolant Air Intercooler (Engine Mounted)
Intercooler water pump Thermostatic control valve (different function)
Expansion tank or Standpipe (may be shared with jacket water system).
Intercooler water heat exchanger Keep-warm systems (also may be shared)
EDG room cooling functions to:
Remove waste heat from engine, generator, components, and EDG room to assure room temperature does not exceed 122oF (50oC).
Accomplished by thermostatically controlled vents, fans, room coolers. Exhaust to avoid recirculation, especially to EDG air intake.
END OF CHAPTER 6