The blower, revisited.

Wednesday, November 3rd, 2010

I am not sure I have ever been happier with a supplier than I am with the company that supplied our blower. They are incredibly helpful and accommodating. Even now after the blower has been paid for and delivered, they are still easy to get hold of, friendly and helpful with all our installation questions. What I am most excited about are the extras they were able to provide that have helped us improve the efficiency of the roaster. The blower as it comes from the factory has square inlet and outlet flanges, very common in blowers of this size and type. However, for our application it is preferable to have round transitions for the inlet and outlet. Round transitions convey air more efficiently, the corners of square transitions create turbulence in the moving air and thus take away energy that could otherwise be used to create the fluidized bed of coffee beans. As I have said before, everything that can be done to save energy should be done, when it is feasible and cost effective of course. Even small losses add up and it is important to keep track of these losses in the system during the design process. No matter the project everyone has to make concessions when designing a product. In this system keeping track of the losses makes it easier to decide where concessions can be made when it comes to decisions between cost, ease in manufacturing, and efficiency. The manufacturer we used supplied us with round transitions at no added cost, and the transitions were fabricated to my exact specifications. We also asked for expedited shipping because of our timeline and they were able to get it here a week after order, so fast in fact that the paint was still a bit wet when it arrived. As you can see from the pictures it is very well made and it looks great; it will look even better with my roast chamber sitting on top of it. A company that provides custom work to my specifications at a reasonable cost, still cares about my problems after I have paid, and ships early; I must be in engineering heaven.

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