Cool Manager

Example 5.10 A liquid-phase, pilot-plant reactor uses a 12-ft tube with a 1.049-in i.d. The working fluid has a density of 860 kg/m, the residence time in the reactor is 10.2 s, and the Reynolds number is 8500. The pressure drop in the pilot plant has not been accurately measured, but is known to be less than 1 psi. The entering feed is preheated and premixed. The inlet temperature is 60°C and the outlet temperature is 64°C. Tempered water at 55°C is used for cooling. Management loves the product and wants you to design a plant that is a factor of 128 scaleup over the pilot plant. Propose scaleup alternatives and explore their thermal consequences. 

Cool managers believe that the workforce is best motivated by giving it whatever it wants. These managers try to bribe their way into the hearts of their children, which is how they view their employees. They want to be everybody s best friend, and they want everyone to smile at them as they walk by. The cool manager often has a wishy-washy management style that results in more confusion than direction. 

Theory X Manager-Cool Manager The manager makes the final decisions, but in an attempt to keep everyone happy, many of the decisions are political and therefore contradictory. The result is more confusion than progress. 

Theory Y Manager-Cool Manager This manager solicits the employees ideas and says yes to everyone, leaving employees without any real guidance from the top. 

Theory Z Manager-Cool Manager This manager is completely employee oriented, but in the effort to keep everyone happy, ends up being an ineffective facilitator, causing frustration and a lack of direction. 

Each process has its unique requirements for toohng, but the costs are generally related to the following factors (1) part size or total projected area (2) mold structural requirements (3) materials of construction (4) cooling management needs and (5) complexity of the part s geometry. 

Eig. 11. Liquid-cooled cold plates or heat sinks have been developed as thermal management solutions to cool components for Hquid-cooled computer systems and other electronic systems where heat removal becomes one of the important design criteria. 

Recent developments in cooling-tower fan energy management also include automatic variable-pitch propeller-type fans and inverter-type devices to permit variable fan speeds. These schemes involve tracking the loaa at a constant leaving-water temperature. 

Management might make certain decrees for the major study keep costs to a minimum maximize air-cooling ... 

Management decisions might not be very definitive. For example, how does one maximize air-cooling Normally, a study will reveal the optimum crossover temperature between air- and water-cooling (often, air-cooling will be shown to be economical above 140°F). What management really wants in this case is air-cooling wherever it can be used economically. 

For reactions which progress slowly at room temperature it may be necessary to heat the mixture or add a catalyst for the reaction to occur at an economically-viable rate. For very fast reactions the mixture may need to be cooled or solvent added to dilute the reactants and hence reduce the speed of reaction to manageable proportions. In general the speed of reaction... 

Overcrowding issues should be noted. Future occupant density is estimated when the ventilation system for a building is designed. When the actual number of occupants approaches or exceeds this occupant design capacity, managers may find that lAQ complaints increase. At that point, the outdoor air ventilation rate will have to be increased. However, the ventilation and cooling systems may not have sufficient capacity to handle the increased loads from the current use of the space. 

A liquid chlorine tank was kept cool by a refrigeration system that used CFCs. In 1976 the local management decided to use ammonia instead. Management w as unaware that ammonia and chlorine react to form explosive nitrogen trichloride. Some of the armnonia leaked into the chlorine, and the nitrogen trichloride that was formed exploded in a pipeline... 

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