Heating and cooling specialist

Are you fascinated by complex mechanical systems Can you quickly figure out how they work Then consider a career as a heating and cooling specialist... 

In 2007 a very important article was published by Kappe [35], a well-known specialist in the field of the microwave research. His group re-examined the Marmich and aldol reactions presented above and carefully investigated the differences between conventional and microwave heating (results presented in Schemes 21.10-21.12). Moreover, the Mannich reaction of acetone with the PMP-protected imino ester of ethyl glyoxylate was studied (Scheme 21.13). In this case the obtained results, under MW (49 W or 270 W with Uquid cooling) at 60 C for lOmin, were very similar in terms of yield and enantioselectivity to those obtained for the reaction performed in an oil bath at the same temperature and reaction time (90-92%, >99% ee). Similar results with microwave dielectric heating and conventional thermal heating were also obtained for the Mannich and aldol reactions presented in Schemes 21.10-21.12 [35]. 

For air-cooled heat exchangers, recirculation is more difficult to define or relate to standard practices. Banks of air-coolers are installed in a variety of configurations so, for a particular proposed installation, a study by specialists may be required. This study of recirculation would probably be done later in the projeet even though the results impact costs. There is a practical limit to the number of front-end studies and this is one that can be deferred until geometry is better defined. 

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