Normchris

[supertek65]

IN NORM'S BOOK, AIRSIDE SYSTEM ANALYSIS, CHAPTER 11 REVIEW PROBLEM #7
THE LARGER THE BLOWER PULLEY, THE----------THE BLOWER WILL RUN.
THE ANSWER KEY ON PAGE 122. SAYS THE ANSWER IS;faster.
I AM NOT SMART ENOUGH TO WRITE BOOKS AND I AM DISLEXIC BUT I BELIEVE THE ANSWER IS; slower
I BELIEVE QUESTION #6 IS WRONG ALSO
FRANK

[lwarren]

Not sure about Norm's book, but you are correct. An increase in the diameter of a fan shive will reduce the rpm. An increase in diameter on the motor shive will increase fan rpm.

[The Doctor]

IN NORM'S BOOK, AIRSIDE SYSTEM ANALYSIS, CHAPTER 11 REVIEW PROBLEM #7
THE LARGER THE BLOWER PULLEY, THE----------THE BLOWER WILL RUN.
THE ANSWER KEY ON PAGE 122. SAYS THE ANSWER IS;faster.
I AM NOT SMART ENOUGH TO WRITE BOOKS AND I AM DISLEXIC BUT I BELIEVE THE ANSWER IS; slower
I BELIEVE QUESTION #6 IS WRONG ALSO
FRANK

yessir. mr. warren is correct. the air balance guys did that to us again. took out the original 6.5 inch blower pulley, and installed like 10.5 inch pulleys ??? we had problems moving enough air on degree days, and in a room where the heat load is constant, that became an issue like straightway(that's the KJV of immediately).
we reinstalled the original pulleys, increased the blower amperage from 15% to 70-80% of the RLA, and everybody lived happily ever after.

I like to crank closed the sheaves( I can never figure out if I'm spelling it wrong) pulley! so that I get the most airflow, and the amps are at least 80-95% of the RLA. just a personal preference though, and in many environments that is just not an option, what with air balancing and all...

[Diceman]

Is all the spelling correct in that book??:D

[tex~n~oz]

Care should be taken NOT to exceed 3.2 M/s across your coil.

[hvacpope]

……..regardless a handful of mistakes “airside system analysis” is the best book written about the subject to this date and a true bargain at $40 bucks. I can point mistakes in pretty much every technical book I’d ever read.

[timebuilder]

You'd be amazed at how easily the most glaring errors can slip by you when you write, particularly in technical writing. The mind inserts the correct letter/word/technical term as you scan a paragraph, and then you send the thing off to the publisher and you find the error only when you get a copy of the work itself.

I had to train myself to get away from the writing for at least a half a day, and two days when I could. Then, things start to stand out that you had not noticed. I can easily see Norm thinking about the pulley on the motor (and how that provides power to the blower) in his head, while looking at "blower pulley" on the screen.

I was looking at the Smith HVAC electrical book the other day, and I was struck by the number of errors I saw. It's a good lesson in the discipline of proofreading, in that the proofreader should understand the text and application of the material, or a great number of mistakes will slip by. If Russ wants, I can proof his book for the next edition.

If anything, supertek65 has just proved to himself that he has a good understanding of one of the seven simple machines, and that can be a real confidence booster. If you can identify a mistake in a book, you probably know the material.